JP5700643B2 - Brushless motor and driving method of brushless motor - Google Patents

Description

  The present invention relates to a brushless motor and a driving method of the brushless motor.

  Conventionally, in a brushless motor, there has been proposed a continuous pole type motor in which the magnet attached to the rotor is halved (for example, Patent Document 1). In a brushless motor with a consequent pole structure, the magnet can be halved, leading to cost reduction, but the magnetic balance of different magnetic poles (N pole and S pole) formed alternately in the circumferential direction of the rotor is unbalanced. Therefore, it is known that the cogging torque is increased even if it is simply adopted.

  In addition, various brushless motors having SC windings on the stator have been proposed (for example, Patent Document 2). The SC winding is a winding in which a split conductor called a U-shaped segment is inserted into each slot of the stator core from the axial direction, and the opposite side is connected by welding or the like in a subsequent process to form a continuous winding in the circumferential direction. Say. This SC winding can increase the number of slots and reduce cogging torque, improve the occupancy of the winding in the slot, and reduce the physique of the motor per output. .

JP 9-327139 A Japanese Patent No. 3303773

  By the way, brushless motors are required to further reduce costs, reduce cogging torque, and increase output. In particular, brushless motors mounted on vehicles such as automobiles are required to be further reduced in noise and vibration so as not to make the driver uncomfortable as well as lower in cost. In addition, in vehicles such as automobiles, further reduction in size and weight of brushless motors are required based on a decrease in installation space and an increase in mounting weight due to an increase in electric devices to be mounted.

  The present invention has been made in order to solve the above-described problems, and its object is to provide a brushless system that can be reduced in cost, reduced in cogging torque, increased in output, and reduced in size and weight. An object of the present invention is to provide a motor and a brushless motor driving method.

The invention according to claim 1 is a continuous rotor in which magnetic poles of 2 × p poles (where p is a number of poles) are alternately arranged in the circumferential direction, and a plurality of the rotors provided per pole and the radial direction 2 × p × m × n cores having teeth and slots (where m is the number of phases of the stator winding and n is a natural number) and multiphase windings wound around the slots. A stator having a stator , wherein the slots of the stator are formed to have the same circumferential width in the radial direction, and the slots have a radial direction without overlapping the windings in the circumferential direction. The rotor core of the continuous rotor has recesses formed on the outer peripheral surface at equal pitches in the circumferential direction, and a magnet is placed on the stator side with respect to each recess. Placed so that it faces The salient poles are formed between the serial recesses, the first to form a magnetic pole different from the second pole, the rotor core, at least one of the radially inner position of the recess and the salient poles, a rotor core A small magnetic lightweight part having a specific gravity and magnetism smaller than that of the material is formed, and in the rotor core, the recess and the salient pole are formed on an outer peripheral surface of a magnet fixing part extending radially outward of the small magnetic lightweight part. The rotor core is formed by laminating a plurality of rotor core pieces made of steel plates, and the rotor core piece is formed with a magnet fixing portion constituting portion extending in a circumferential direction outward in a radial direction of a constituting portion of the small magnetic lightweight portion. And forming concave portions on the outer peripheral surface of the magnet fixing portion constituting portion at an equal pitch in the circumferential direction, and projecting between the concave portion forming portion and the concave portion forming portion on the outer peripheral surface of the magnet fixing portion constituting portion. Shape pole component The small magnetic light weight part is formed by the constituent parts of the small magnetic light weight part of the rotor core piece laminated in the axial direction, and the magnet is fixed by the magnet fixing part constituent part of the rotor core piece laminated in the axial direction. The fixing portion is formed, the concave portion is formed by the concave portion constituting the rotor core piece laminated in the axial direction, and the salient pole is formed by the salient pole constituting portion of the rotor core piece laminated in the axial direction . .

According to the first aspect of the present invention and the third, fifth, seventh, and eleventh aspects of the invention , the small magnetic light weight portion has a small specific gravity, so that the weight of the motor can be reduced. In addition, since the small magnetic lightweight portion has a small magnetism, the magnetic flux of the magnetic pole does not easily flow to the rotating shaft side, and the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor is improved. As a result, cogging torque is reduced, noise is reduced, vibration is reduced, and output is increased. In addition, the physique of the motor per output can be reduced by increasing the output.

According to a second aspect of the present invention, there is provided a continuous rotor in which magnetic poles are alternately arranged in the circumferential direction, and a multi-phase comprising SC windings in a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor. A stator having a stator wound with a winding , wherein the slots of the stator are formed to have the same circumferential width in the radial direction, and the windings are arranged in the circumferential direction in the slots. The rotor core of the contiguous rotor has a concave portion formed on the outer peripheral surface at an equal pitch in the circumferential direction, and the magnet is placed on the stator side with respect to each concave portion. to disposed such that the first magnetic pole, the salient poles formed between the recess and the recess to form a second magnetic pole different from the first magnetic pole, the rotor core, the recess And the bump At least one of the radially inward position, to form a small magnetic weight parts specific gravity and magnetism smaller than the rotor core material in the rotor core, the recess and the salient poles are circumferentially radially outward of said small magnetic weight parts of The rotor core is formed by laminating a plurality of rotor core pieces made of steel plates, and the rotor core piece is formed on the outer side in the radial direction of the constituent part of the small magnetic lightweight part. Forming a magnet fixing portion constituent portion extending in the circumferential direction, forming concave portion constituent portions on the outer peripheral surface of the magnet fixing portion constituent portion at an equal pitch in the circumferential direction, and forming the concave portion configuration on the outer peripheral surface of the magnet fixing portion constituent portion; A salient pole component is formed between the portion and the concave component, and the small magnetic light weight portion is formed by the small magnetic light weight component of the rotor core piece laminated in the axial direction. The magnet fixing portion is formed by the magnet fixing portion constituting portion of the layered rotor core piece, the recess is formed by the recessed portion forming portion of the rotor core piece laminated in the axial direction, and the laminated portion is axially laminated. The salient pole was formed by the salient pole constituting part of the rotor core piece .

According to the invention described in claim 2 and the inventions described in claims 4, 6, 8, and 12 below, since the small magnetic lightweight part has a small specific gravity, the weight of the motor can be reduced. In addition, since the small magnetic lightweight portion has a small magnetism, the magnetic flux of the magnetic pole does not easily flow to the rotating shaft side, and the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor is improved. As a result, cogging torque is reduced, noise is reduced, vibration is reduced, and output is increased. In addition, the physique of the motor per output can be reduced by increasing the output.

According to a third aspect of the present invention, there is provided a continuous rotor in which magnetic poles of 2 × p poles (where p is a pair of poles) are alternately arranged in a circumferential direction, a plurality of the rotors provided per magnetic pole, and a radial direction 2 × p × m × n cores having teeth and slots (where m is the number of phases of the stator winding and n is a natural number) and multiphase windings wound around the slots. The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, The stator side surface formed between the magnet and the second magnetic pole different from the first magnetic pole is formed, and the rotor core of the continuous rotor includes a shaft-fixed tube portion fixed to a rotating shaft, , The shaft-fixed tube portion is spaced at a fixed interval A magnet-fixed cylindrical portion in which the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side, the shaft-fixed cylindrical portion, and the magnet-fixed cylindrical portion; And a bridging portion that connects and holds the shaft-fixed tube portion and the magnet-fixed tube portion at regular intervals, and is formed on the rotor core with the shaft fixed A gap as a small magnetic lightweight part having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridging parts connecting the cylindrical part and the magnet fixing cylindrical part, and the bridging parts are respectively in the radial direction. A radial center axis of the extending bridging portion is connected to the inner peripheral surface of the magnet fixing cylinder portion so as to be orthogonal to the circumferential center position of the second magnetic pole .

According to the invention of claim 3 and the inventions of claims 4 to 8, 11 and 12 below, the magnetic balance of the first magnetic pole and the second magnetic pole formed alternately in the circumferential direction of the rotor is To improve .

Further, according to the invention described in the invention and the following claims 4～8,11,12 according to claim 3, a plurality of bridge is circumferential between the shaft fixed barrel portion and the magnet fixed cylinder portion Since they are formed at equal pitches in the direction, the magnetic flux from the first magnetic pole of the magnet-fixed cylindrical portion is less likely to flow to the fixed cylindrical portion of the shaft-fixed cylindrical portion via these bridging portions and concentrates on the second magnetic pole. Therefore, the magnetic balance between the first magnetic pole and the second magnetic pole, which are alternately formed in the circumferential direction of the rotor, is improved, leading to reduction of cogging torque, noise reduction, vibration reduction and high output. In addition, the physique of the motor per output can be reduced by increasing the output. Further, since the space is formed in the rotor core by connecting the shaft fixing cylinder part and the magnet fixing cylinder part with each bridging part, the motor can be reduced in weight.

Further , according to the invention described in claim 3 and the invention described in claim 4 below, the magnetic flux of the first magnetic pole hardly flows to the shaft-fixed cylinder portion via the bridging portion and becomes the second magnetic pole. First, the magnetic balance between the magnetic pole and the second magnetic pole is further improved, leading to reduction of cogging torque, noise reduction, vibration reduction, and high output.
According to a fourth aspect of the present invention, there is provided a continuous rotor in which magnetic poles are alternately arranged in the circumferential direction, and a multi-phase comprising SC windings in a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor. A brushless motor having a stator wound with a winding, wherein the rotor core of the continuous rotor has a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side Then, the stator side surface formed between the magnets is formed by a second magnetic pole different from the first magnetic pole, and the rotor core of the continuous rotor is fixed to a rotating shaft. And a magnet in which the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side. A fixed cylinder part; A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval; In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion. The bridging portions are connected to the inner peripheral surface of the magnet fixing cylinder portion so that the radial center axis of the bridging portion extending in the radial direction is orthogonal to the circumferential center position of the second magnetic pole. ing.
According to a fifth aspect of the present invention, there is provided a continuous rotor in which magnetic poles of 2 × p poles (where p is a number of pole pairs) are alternately arranged in the circumferential direction, a plurality of the rotors provided per magnetic pole, and a radial direction 2 × p × m × n cores having teeth and slots (where m is the number of phases of the stator winding and n is a natural number) and multiphase windings wound around the slots. The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, The stator side surface formed between the magnet and the second magnetic pole different from the first magnetic pole is formed, and the rotor core of the continuous rotor includes a shaft-fixed tube portion fixed to a rotating shaft, , The shaft-fixed tube portion is spaced at a fixed interval A magnet-fixed cylindrical portion in which the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side, the shaft-fixed cylindrical portion, and the magnet-fixed cylindrical portion; And a bridging portion that connects and holds the shaft-fixed tube portion and the magnet-fixed tube portion at regular intervals, and is formed on the rotor core with the shaft fixed A gap as a small magnetic light weight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridging portions connecting the cylinder portion and the magnet fixing cylinder portion, and the magnet fixing cylinder portion forming the gap is formed. The inner side surface is formed with a groove whose central position is deepest toward the stator side, and the groove has an inner bottom surface formed in an arc shape when viewed in the axial direction, and the arc-shaped inner bottom surface Both side portions are edged in an arc shape and are continuous with the inner side surface.
According to the invention described in claim 5 and the invention described in claim 6 below, the magnetic fluxes of the magnets are concentrated on the adjacent salient poles, and are formed alternately in the circumferential direction of the rotor. The magnetic balance between the magnetic pole and the second magnetic pole is further improved.
According to a sixth aspect of the present invention, there is provided a continuous rotor in which magnetic poles are alternately arranged in a circumferential direction, and a multi-phase composed of SC windings in a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor. A brushless motor having a stator wound with a winding, wherein the rotor core of the continuous rotor has a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side Then, the stator side surface formed between the magnets is formed by a second magnetic pole different from the first magnetic pole, and the rotor core of the continuous rotor is fixed to a rotating shaft. And a magnet in which the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side. A fixed cylinder part; A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval; In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion. The inner surface of the magnet fixing cylinder part forming the gap is formed with a groove whose central position is deepest toward the stator side, and the groove has an arc shape when the inner bottom surface is viewed from the axial direction. In addition to being formed, both sides of the arc-shaped inner bottom surface are connected to the inner side surface by being edged in an arc shape.
The invention according to claim 7 is a continuous rotor in which magnetic poles of 2 × p poles (where p is a pair of poles) are alternately arranged in the circumferential direction, and a plurality of the rotors provided per magnetic pole and the radial direction. 2 × p × m × n cores having teeth and slots (where m is the number of phases of the stator winding and n is a natural number) and multiphase windings wound around the slots. The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, The stator side surface formed between the magnet and the second magnetic pole different from the first magnetic pole is formed, and the rotor core of the continuous rotor includes a shaft-fixed tube portion fixed to a rotating shaft, , The shaft-fixed tube portion is spaced at a fixed interval A magnet-fixed cylindrical portion in which the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side, the shaft-fixed cylindrical portion, and the magnet-fixed cylindrical portion; And a bridging portion that connects and holds the shaft-fixed tube portion and the magnet-fixed tube portion at regular intervals, and is formed on the rotor core with the shaft fixed A gap as a small magnetic light weight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridging portions connecting the tubular portion and the magnet fixing tubular portion, and the magnets on the extension lines of the bridging portions are formed. A second small magnetic lightweight portion is formed in the axial direction on the side surface of the fixed cylinder portion.
According to the invention described in claim 7 and the invention described in claim 8 below, the magnetic balance between the first magnetic pole and the second magnetic pole can be further improved, and the weight of the motor is further reduced. can do.
According to an eighth aspect of the present invention, there is provided a continuous rotor in which magnetic poles are alternately arranged in a circumferential direction, and a multi-phase comprising SC windings in a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor. A brushless motor having a stator wound with a winding, wherein the rotor core of the continuous rotor has a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side Then, the stator side surface formed between the magnets is formed by a second magnetic pole different from the first magnetic pole, and the rotor core of the continuous rotor is fixed to a rotating shaft. And a magnet in which the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side. A fixed cylinder part; A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval; In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion. The second small magnetic lightweight portion is formed in the axial direction on the side surface of the magnet fixing cylinder portion on the extension line of each bridge portion.

According to a ninth aspect of the present invention, in the brushless motor according to the seventh or eighth aspect, the second small magnetic lightweight portion is a second gap penetrating a side surface of the magnet fixing cylinder portion.
According to the invention described in claim 9, the magnetic balance between the first magnetic pole and the second magnetic pole can be further improved, and the weight of the motor can be further reduced.
A tenth aspect of the present invention is the brushless motor according to any one of the third to ninth aspects, wherein each of the bridging portions has a length in the axial direction, the axial fixed cylinder portion and the magnet fixed cylinder. It is shorter than the length of the part in the axial direction.

According to the tenth aspect of the present invention, the magnetic flux of the magnet concentrates on the salient poles that hardly flow in the rotation axis direction, and the first magnetic pole and the second magnetic pole formed alternately in the circumferential direction of the rotor. And the magnetic balance is improved.

According to an eleventh aspect of the present invention, there is provided a continuous rotor in which magnetic poles of 2 × p poles (where p is a pair of poles) are alternately arranged in a circumferential direction, a plurality of the rotors provided per magnetic pole, and a radial direction 2 × p × m × n cores having teeth and slots (where m is the number of phases of the stator winding and n is a natural number) and multiphase windings wound around the slots. The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, The stator side surface formed between the magnet and the second magnetic pole different from the first magnetic pole is formed, and the rotor core of the continuous rotor includes a shaft-fixed tube portion fixed to a rotating shaft, , The shaft fixing cylinder part for a certain period A magnet-fixed cylinder portion in which the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side, the shaft-fixed cylinder portion, and the magnet-fixed cylinder portion And a bridging portion that connects and holds the shaft-fixed tube portion and the magnet-fixed tube portion at a constant interval, and the rotor core includes the shaft. A gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridging portions connecting the fixed cylindrical portion and the magnet fixed cylindrical portion, and the rotor core of the continuous rotor is at least The magnet is covered with a cover, and the cover is connected and fixed to a second gap formed on the side surface of the magnet fixing cylinder portion .

According to the invention described in claim 11 and the invention described in claim 12 below , the magnet does not fall off by the cover. Further, since the cover for preventing the drop-off is formed on the rotor core, it is not necessary to provide a special part for fixing the cover and to secure a space for mounting the special part in the motor .

According to a twelfth aspect of the present invention, there is provided a continuous rotor in which magnetic poles are alternately arranged in a circumferential direction, and a multi-phase comprising SC windings in a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor. A brushless motor having a stator wound with a winding, wherein the rotor core of the continuous rotor has a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side Then, the stator side surface formed between the magnets is formed by a second magnetic pole different from the first magnetic pole, and the rotor core of the continuous rotor is fixed to a rotating shaft. And a magnet in which the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side. With fixed cylinder A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval. In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion. The rotor core of the continuous rotor covers at least the magnet with a cover, and the cover is connected and fixed to a second gap formed on a side surface of the magnet fixing cylinder portion .

The invention according to claim 13 is the brushless motor according to any one of claims 3 to 12, wherein the rotor core of the continuous rotor has concave portions formed on the outer peripheral surface at equal pitches in the circumferential direction, A magnet is disposed with respect to each recess so that the first magnetic pole faces the stator, and a second magnetic pole different from the first magnetic pole is formed on a salient pole formed between the recess and the recess. Form.
According to the thirteenth aspect of the present invention, by attaching the magnet to the concave portion formed in the rotor core, the second salient pole is different from the first magnetic pole formed on the stator side of the magnet. A magnetic pole is formed. The first magnetic pole and the second magnetic pole are alternately formed in the circumferential direction of the rotor.
The invention according to claim 1 4, in the brushless motor according to any one of claims 3 to 1 3, the rotor core of the consequent rotor, rotor core piece made of steel are constituted by stacking a plurality .

According to the invention described in claim 1 4, in easily consequent rotor magnetic is moved in the rotor core, in addition to eddy current suppression effect by the magnetic transfer inhibiting effect of the small magnetic lightweight unit, the rotor core pieces are stacked This further suppresses the generation of eddy currents.

The invention according to claim 1 5, in a brushless motor according to any one of claims 1 to 1 4, the rotating shaft fixed to the rotor core of the rotor is formed by non-magnetic material.

According to the invention described in claim 15 , the magnetic flux of the first magnetic pole hardly flows to the rotating shaft, and the magnetic balance between the first magnetic pole and the second magnetic pole is further improved.
The invention according to claim 16 is the brushless motor according to any one of claims 1 to 15 , wherein the stator includes a stator core having a plurality of teeth extending in a radial direction and provided at a constant pitch in a circumferential direction. There are two different three-phase windings attached to the teeth, and each of the three-phase windings of the stator has a plurality of axially penetrated slots between the teeth and is laminated in the radial direction. SC winding composed of a conductor portion and connected in the circumferential direction by being electrically connected by welding at the outer end in the axial direction on the core side between conductor portions adjacent in the radial direction for each phase. Each of the power receiving terminals was pulled out in the axial direction from the conductor portion at the same radial stacking position.

According to the invention described in claim 16 , the number of slots can be increased, the cogging torque can be reduced, the occupancy of the windings in the slots is improved, and the physique of the motor per output is reduced. Can be physique.

The invention described in claim 17 is the brushless motor according to claim 16 , wherein the stator has a first conductor portion and a fourth conductor portion, and the first conductor portion and the fourth conductor portion are based on the stator. An outer conductor for wave winding connected at an end portion, an outer conductor for wave winding having a second conductor portion and a third conductor portion, and the second conductor portion and the third conductor portion being connected at a base end portion It has a segment consisting of an inner conductor for lap winding enclosed in a conductor, the first conductor part and the second conductor part, and the third conductor part and the fourth conductor part as a respective set, Each set is inserted into each slot formed in an in-phase stator core adjacent to each other, and the first conductor portion to the fourth conductor portion are radially inserted into the slots from the first conductor portion to the second conductor portion. , The third conductor portion, the fourth conductor portion in this order, the first conductor portion of one adjacent slot Connecting the tip portion and the tip portion of the second conductor portion of the other slot adjacent to the tip portion, and the tip portion of the fourth conductor portion of the other slot adjacent to the tip portion of the third conductor portion of one of the adjacent slots; Is a stator in which three-phase Y-connection windings composed of SC windings are wound with a shift of one slot pitch.

According to the invention of claim 17 , the number of slots can be increased, the cogging torque can be reduced, the occupancy of the windings in the slots is improved, and the physique of the motor per output is reduced. Can be physique.

The invention described in claim 18 is the brushless motor driving method described in claim 16 or 17 , wherein the brushless motor has a phase difference of 30 degrees with respect to two different three-phase windings wound around the stator. Energized.

According to the invention described in claim 18 , the torque ripple of the sixth-order electrical angle component generated in the brushless motor is eliminated by feeding two different three-phase windings with a phase difference of 30 degrees electrical angle. Can do. In addition, by setting the magnetic skew between the stator and the rotor to have an electrical angle of 60 degrees, the torque ripple of the 12th-order electrical angle component generated in the brushless motor can be eliminated.

  According to the present invention, it is possible to reduce the cost, reduce the cogging torque, increase the output, and reduce the size and weight.

Sectional drawing of the brushless motor of this embodiment. The perspective view of the stator seen from the front end plate side of this embodiment. The perspective view of the stator seen from the rear cover wall side of this embodiment. The partial cross section figure of the stator seen from the front end plate side of this embodiment. FIG. 5 is a cross-sectional view of the stator of FIG. 4 taken along line aa. The partial expanded view of the three-phase winding of this embodiment. Similarly, a partial development view of a three-phase winding. The perspective view of the segment before slot insertion. The perspective view of the segment after slot insertion. The partial expanded view of the winding of U1 phase of the 1st system. Similarly, the partial expanded view of the winding of U1 phase of the 1st system. Sectional drawing which shows the state in which each conductor part of the segment was inserted in the slot. Explanatory drawing for demonstrating the connection of the adjacent segments of the same phase. The electric circuit diagram of the 1st system 3 phase winding. The partial expanded view of the winding of U2 phase of the 2nd system. The partially expanded view of the winding of U2 phase of the 2nd system similarly. The electric circuit diagram of 2nd system | strain 3 phase winding. The perspective view for demonstrating a rotor. The front view seen from the axial direction for demonstrating a stator and a rotor. The perspective view for demonstrating a rotor. The perspective view for demonstrating a rotor core. The front view which looked at the rotor core from the axial direction. The front view which looked at the rotor core which shows another example of this invention from the axial direction. Sectional drawing of the rotor core which shows another example of this invention. The perspective view of the rotor core which shows another example of this invention.

Hereinafter, an embodiment in which the brushless motor of the present invention is embodied will be described with reference to FIGS.
As shown in FIG. 1, the motor case 2 of the brushless motor 1 is formed of a bottomed cylindrical housing 3 and a front end plate 4 that closes a front-side opening of the cylindrical housing 3. An accommodation box 5 is attached to the rear cover wall 3 a on the rear side of the cylindrical housing 3.

  A stator 6 shown in FIGS. 2 and 3 is fixed to the inner peripheral surface of the cylindrical housing 3. As shown in FIGS. 4 and 5, the stator 6 includes a stator core 7, and the stator core 7 includes a cylindrical portion 8 and a plurality of teeth 9 extending radially inward from the cylindrical portion 8 and provided in the circumferential direction. Have. As shown in FIGS. 1 and 5, the stator core 7 forms a single stator core 7 by laminating a plurality of stator core pieces 7 a (not shown in FIGS. 2 to 4) made of laminated steel materials.

  In the present embodiment, 60 teeth 9 are formed as shown in FIG. Accordingly, 60 slots S formed between the teeth 9 are formed, and the 60 slots S are arranged and formed at an equiangular interval of 6 degrees when viewed from the central axis of the cylindrical portion 8. For convenience of explanation, when individual slots S need to be individually identified, slot numbers “1” to “60” that are consecutive numbers in the circumferential direction of the 60 slots S will be described.

  As shown in FIGS. 6 and 7, a three-phase winding composed of a U phase, a V phase, and a W phase is wound around each slot S. 6 and 7, slot numbers “1” to “60” of the slots S are given in the circumferential direction.

  A U-shaped segment SG shown in FIG. 8 is inserted into each slot S from the one side in the axial direction (rear cover wall 3a side) to the other side (front end plate 4 side). Then, by connecting the segments SG with each other according to a predetermined rule, a three-phase Y-connected SC winding is formed.

  As shown in FIG. 8, the segment SG before being inserted into the slot S has a U-shaped outer conductor OS for wave winding and an inner conductor IS for lap winding. The outer conductor OS and the inner conductor IS are coated with an insulating material so that the outer conductor OS and the inner conductor IS are not electrically connected.

  The outer conductor OS has a first conductor part OSi and a fourth conductor part OSo, and the base end part of the first conductor part OSi and the base end part of the fourth conductor part OSo are connected by the connecting conductor part OSc. Yes. The first conductor portion OSi and the fourth conductor portion OSo are bent so as to expand in a direction away from the connecting conductor portion OSc, and then bent so as to be parallel to each other.

  The inner conductor IS is disposed so as to be surrounded by the outer conductor OS. The inner conductor IS has a second conductor portion ISi and a third conductor portion ISo, and the base end portion of the second conductor portion ISi and the base end portion of the third conductor portion ISo are connected by the connecting conductor portion ISc. Yes. The second conductor portion ISi is bent from the connecting conductor portion ISc along the first conductor portion OSi of the outer conductor OS. The third conductor part ISo is bent from the connecting conductor part ISc along the fourth conductor part OSo of the outer conductor OS.

  The U-shaped segment SG before being inserted into the slot S is formed by arranging the inner conductor IS inside the outer conductor OS. For the segment SG thus formed, the first and second conductor portions OSi, ISi of the outer and inner conductors OS, IS are inserted into the same slot S, and the fourth and third of the outer and inner conductors OS, IS are inserted. The conductor portions OSo and ISo are inserted into adjacent in-phase slots S different from the first and second conductor portions OSi and ISi.

  For example, when the first and second conductor portions OSi, ISi are inserted into the slot S with the slot number “60” for the outer and inner conductors OS, IS, the fourth and third conductor portions OSo, ISo are assigned with the slot number “6”. Is inserted into the slot S. That is, the first and second conductor portions OSi, ISi and the fourth and third conductor portions OSo, ISo of one segment SG are inserted with an interval of 6 slot pitches.

  In the slot S with the slot number “6” into which the fourth and third conductor portions OSo and ISo are inserted, the first and second conductor portions OSi and ISi of the outer and inner conductors OS and IS of the adjacent segment SG are provided. Inserted. Further, the adjacent segment SG inserts the fourth and third conductor portions OSo, ISo of its outer and inner conductors OS, IS into the slot S of the slot S number “12”.

  The segments SG are sequentially inserted into the slots S from the rear cover wall 3a side to the front end plate 4 side in the same manner. As a result, the first and second conductor portions OSi, ISi of the outer and inner conductors OS, IS of the tenth segment SG are inserted into the slot S of the slot number “60” and make one round. A winding for one phase is formed by connecting the 10 rotated segments SG to each other.

  Therefore, since there are 60 slots S and 6-phase windings are formed, two U-phase, V-phase, and W-phase three-phase windings (the first three-phase winding and the second three-phase winding) Winding) will be formed. Here, when specifying and explaining the first system three-phase winding and the second system three-phase winding, respectively, the phases of the first system three-phase winding are U1, V1, and W1 phases, Each phase of the second system three-phase winding is referred to as a U2 phase, a V2 phase, and a W2 phase.

  Independent three-phase AC power is supplied to the first system three-phase winding and the second system three-phase winding. In the present embodiment, the three-phase alternating current fed to the first system three-phase winding and the three-phase alternating current fed to the second system three-phase winding have a phase difference of an electrical angle of 30 degrees.

  In this embodiment, the slots S used by the windings of each phase of the first system three-phase winding and the second system three-phase winding are assigned as shown in Table 1.

表１から明らかなように、第１系統３相巻線のＵ１相は、スロット番号が「６０」、「６」、「１２」、「１８」、「２４」、「３０」、「３６」、「４２」、「４８」、「５４」のスロットＳに巻線が巻回（セグメントＳＧが挿入）されることがわかる。

As is apparent from Table 1, the slot numbers of the U1 phase of the first system three-phase winding are “60”, “6”, “12”, “18”, “24”, “30”, “36”. , “42”, “48”, “54”, the winding is wound (segment SG is inserted).

  The V1 phase of the first system three-phase winding is wound in each slot S shifted by 2 slot pitches relative to the U1 phase winding of the first system three-phase winding (segment SG is inserted). ) In addition, the W1 phase of the first system three-phase winding is wound in each slot S shifted by 4 slot pitches relative to the U1 phase winding of the first system three-phase winding (segment SG is inserted). )

  By the way, the U2 phase of the second system three-phase winding is shifted by one slot pitch with respect to the U1 phase winding of the first system three-phase winding, and the slot numbers are “1”, “7”, “13”. ”,“ 19 ”,“ 25 ”,“ 31 ”,“ 37 ”,“ 43 ”,“ 49 ”,“ 55 ”, the winding is wound (segment SG is inserted).

  Similarly, the V2 phase of the second system three-phase winding is wound in each slot S shifted by 2 slot pitches relative to the U2 phase winding of the second system three-phase winding (segment SG is It can be seen that In addition, the W2 phase of the second system three-phase winding is wound in each slot S shifted by 4 slot pitches relative to the U2 phase winding of the second system three-phase winding (segment SG is inserted). )

  Then, the segment SG including the wave winding outer conductor OS and the lap winding inner conductor IS shown in FIG. 8 is inserted into all 60 slots S under the above conditions. Subsequently, as shown in FIG. 9, the outer conductor OS and the inner conductor IS are bent and formed in all slots S for the segments SG to form the windings of the respective phases.

  The outer conductor OS for wave winding is bent in a direction in which the first conductor portion OSi and the fourth conductor portion OSo protruding from the slot S are separated from each other. And about the 1st and 4th conductor part OSi and OSo of the outer side conductor OS, the part which protruded from the slot S and was bent in the direction mutually spaced apart is called 1st and 4th welding part OWi and OWo.

On the other hand, the folding of the inner conductor IS for lap winding is performed by bending the second conductor portion ISi and the third conductor portion ISo of the portion protruding from the slot S so as to approach each other. And about the 2nd and 3rd conductor part ISi, ISo of the inner side conductor IS, the part which protruded from the slot S and was bent in the direction which mutually approaches is called 2nd and 3rd weld part IWi, IWo.
(First system three-phase winding)
Next, the first system three-phase winding will be described.

Here, a winding method of the U1-phase winding of the first system three-phase winding using the ten segments SG will be described with reference to FIGS. 10 and 11.
Slots S having slot numbers shown in Table 1 are assigned to slots S used for the U1 phase winding of the first system, and ten segments SG1 to SG10 are used.

  Here, the first segment SG1 is inserted into slot S with slot numbers “60” and “6”. The second segment SG2 is inserted into slot S with slot numbers “6” and “12”. The third segment SG3 is inserted into slot S with slot numbers “12” and “18”. The fourth segment SG4 is inserted into slot S with slot numbers “18” and “24”. The fifth segment SG5 is inserted into slot S with slot numbers “24” and “30”.

  Further, the sixth segment SG6 is inserted into slot S with slot numbers “30” and “36”. The seventh segment SG7 is inserted into slot S with slot numbers “36” and “42”. The eighth segment SG8 is inserted into slot S with slot numbers “42” and “48”. The ninth segment SG9 is inserted into slot S with slot numbers “48” and “54”. The tenth segment SG10 is inserted into slot S with slot numbers “54” and “60”.

  When inserting the segments SG1 to SG10 into each slot S, the connecting conductor portion OSc of the outer conductor OS and the connecting conductor portion ISc of the inner conductor IS are inclined so that the subsequent segment can be easily inserted into the predetermined slot S. As shown in FIG. 3, it is bent and inserted so as to be twisted.

  As shown in FIG. 10, the first segment SG1 for the U1 phase is inserted in the slot numbers “60” and “6”. Accordingly, the second conductor portion ISi of the inner conductor IS and the first conductor portion OSi of the outer conductor OS are arranged in the slot S of the slot number “60”, and the inner conductor is inserted in the slot S of the slot number “6”. A third conductor portion ISo of IS and a fourth conductor portion OSo of the outer conductor OS are arranged.

In the slot numbers “6” and “12”, the second segment SG2 for the U1 phase is inserted. Accordingly, the second conductor portion ISi of the inner conductor IS and the first conductor portion OSi of the outer conductor OS are arranged in the slot S of the slot number “6”, and the inner conductor is inserted in the slot S of the slot number “12”. A third conductor portion ISo of IS and a fourth conductor portion OSo of the outer conductor OS are arranged.

  At this time, in the slot S of the slot number “6”, the third and fourth conductor portions ISo and OSo of the inner and outer conductors IS and OS of the first segment SG1 are arranged, and the second segment SG2 The first and second conductor portions OSi, ISi of the outer and inner conductors OS, IS are arranged.

  That is, as shown in FIG. 12, the slot S has a four-layer structure in the order of the first conductor portion OSi, the second conductor portion ISi, the third conductor portion ISo, and the fourth conductor portion OSo from the inside in the radial direction. Has been placed. Then, the fourth welded portion OWo of the outer conductor OS (inserted through the slot number “6”) of the first segment SG1 and the inner conductor IS (slot number “12” of the second segment SG2 are inserted). The third welded portion IWo is welded.

An insulator 10 is formed on the inner peripheral surface of the slot S, and the segment SG and the stator core 7 of the stator 6 are electrically insulated.
In the slot numbers “12” and “18”, the third segment SG3 for the U1 phase is inserted. Accordingly, the second conductor portion ISi of the inner conductor IS and the first conductor portion OSi of the outer conductor OS are arranged in the slot S of the slot number “12”, and the inner conductor is inserted in the slot S of the slot number “18”. A third conductor portion ISo of IS and a fourth conductor portion OSo of the outer conductor OS are arranged.

  At this time, the third and fourth conductor portions ISo, OSo of the inner and outer conductors IS, OS of the second segment SG2 are arranged in the slot S of the slot number “12”, and the third segment SG3 The first and second conductor portions OSi, ISi of the outer and inner conductors OS, IS are arranged. Then, the fourth welded portion OWo of the outer conductor OS (inserted through the slot number “12”) of the second segment SG2 and the inner conductor IS (slot number “18” of the third segment SG3 are inserted). A) Welding the third welded part IWo of o.

  Furthermore, the second welded portion IWi of the inner conductor IS (inserted through the slot number “6”) of the second segment SG2 and the outer conductor OS (slot number “12” of the third segment SG3). The fourth welded portion OWo of (inserted) is welded. Thereafter, the same process is repeated for the similar 4 to 10 segments SG4 to SG10, whereby the U1 phase winding shown in FIGS. 10 and 11 is formed.

Here, welding of adjacent segments SG will be described.
For convenience of explanation, between the adjacent second segment SG2 and the tenth segment SG10 with respect to the first segment SG1 inserted into the slot S with slot numbers “60” and “6”. Next, welding will be described.

  As shown in FIG. 13, the first welded portion OWi of the outer conductor OS of the first segment SG1 has a distal end surface S1 of the second welded portion IWi of the inner conductor IS of the tenth segment SG10. Are welded with a welding member B1 and electrically connected to each other. Further, the second welded portion IWi of the inner conductor IS of the first segment SG1 is welded between the distal end surface S2 of the first welded portion OWi of the outer conductor OS of the second segment SG2. It is welded and electrically connected by the member B1.

  Further, the third welded portion IWo of the inner conductor IS of the first segment SG1 is welded between the tip surface S3 and the tip surface S4 of the fourth welded portion OWo of the outer conductor OS of the tenth segment SG10. It is welded and electrically connected by the member B2.

  Furthermore, the fourth welded portion OWo of the outer conductor OS of the first segment SG1 has a tip surface S4 between the tip surface S3 of the third welded portion IWo of the inner conductor IS of the second segment SG2. It is welded by the welding member B2 and is electrically connected.

  In this manner, the other V1-phase and W1-phase windings of the first system three-phase winding are wound in the same manner as the U1-phase winding. Further, the first system three-phase winding is constituted by a three-phase Y connection. Then, neutral point terminals T0u, T0v, T0w connected to the neutral point N1 (see FIG. 14) and electric power receiving terminals T1u, T1v, T1w for receiving electric power are determined for each phase winding.

As shown in FIGS. 1 and 2, the segments SG of the first-phase three-phase windings are all welded so that the weld ends are uniformly aligned in the axial direction. And the space | interval of the front end and front end plate 4 of each segment SG is formed so that it may become the same.
(Setting of neutral point terminal and power receiving terminal)
As shown in FIGS. 6 and 15, in the present embodiment, for the U1-phase winding, the connecting conductor portions OSc, ISc located on the rear cover wall 3a side of the outer conductor OS and the inner conductor IS of the first segment SG1. Isolate.

  Here, the separation end of the connection conductor portion OSc of the outer conductor OS and the connection end to the fourth conductor portion OSo of the outer conductor OS, and the separation end of the connection conductor portion ISc of the inner conductor IS and the same inner conductor IS. The one connected to the second conductor portion ISi is connected.

  The one that is connected to the first conductor portion OSi of the outer conductor OS and that is the separation end of the connecting conductor portion OSc of the outer conductor OS is defined as a neutral point terminal T0u of the U1 phase. On the other hand, the one connected to the third conductor portion ISo of the inner conductor IS and the separated end of the connecting conductor portion ISc of the inner conductor IS is defined as a U1-phase power receiving terminal T1u.

  That is, the neutral point terminal T0u is a terminal drawn out from the first conductor portion OSi of the outer conductor OS arranged on the innermost side in the radial direction in the slot S of the slot number “60”. The power receiving terminal T1u is a terminal drawn out from the third conductor portion ISo of the inner conductor IS disposed at the third outer position in the radial direction in the slot S of the slot number “6”.

Therefore, the power receiving terminal T1u is disposed outside the neutral point terminal T0u in the radial direction in the slot S.
Further, as shown in FIG. 6, for the V1 phase winding, the outer conductor OS of the segment SG and the connecting conductor portions OSc and ISc of the inner conductor IS inserted in the slot numbers “56” and “2” are separated.

  Similarly, the separated end of the connecting conductor portion OSc of the outer conductor OS and the fourth conductor portion OSo of the outer conductor OS, and the separated end of the connecting conductor portion ISc of the inner conductor IS and the inner conductor IS. The one connected to the second conductor portion ISi is connected.

  The one that is connected to the first conductor portion OSi of the outer conductor OS and that is the separation end of the connecting conductor portion OSc of the outer conductor OS is defined as a neutral point terminal T0v of the V1 phase. On the other hand, the one connected to the third conductor portion ISo of the inner conductor IS and the separated end of the connecting conductor portion ISc of the inner conductor IS is defined as a V1 phase power receiving terminal T1v.

  That is, the neutral point terminal T0v is a terminal drawn out from the first conductor portion OSi of the outer conductor OS arranged on the innermost side in the radial direction in the slot S of the slot number “56”. The power receiving terminal T1v is a terminal drawn from the third conductor portion ISo of the inner conductor IS arranged at the third outer position in the radial direction in the slot S of the slot number “2”.

Therefore, the power receiving terminal T1v is arranged outside in the radial direction in the slot S from the neutral point terminal T0v.
Further, as shown in FIG. 6, for the W1 phase winding, the outer conductor OS of the segment SG and the connecting conductor portions OSc and ISc of the inner conductor IS inserted in the slot numbers “52” and “58” are separated.

  Similarly, the separated end of the connecting conductor portion OSc of the outer conductor OS and the fourth conductor portion OSo of the outer conductor OS, and the separated end of the connecting conductor portion ISc of the inner conductor IS and the inner conductor IS. The one connected to the second conductor portion ISi is connected.

  The one that is connected to the first conductor part OSi of the outer conductor OS and that is the separation end of the connection conductor part OSc of the outer conductor OS is defined as a neutral point terminal T0w of the W1 phase. On the other hand, the W1 phase power receiving terminal T1w is the separation end of the connecting conductor portion ISc of the inner conductor IS and the one connected to the third conductor portion ISo of the inner conductor IS.

  That is, the neutral point terminal T0w is a terminal drawn out from the first conductor portion OSi of the outer conductor OS arranged on the innermost side in the radial direction in the slot S of the slot number “52”. The power receiving terminal T1w is a terminal drawn from the third conductor portion ISo of the inner conductor IS arranged at the third outer position in the radial direction in the slot S of the slot number “58”.

Therefore, the power receiving terminal T1w is disposed outside the neutral point terminal T0w in the radial direction in the slot S.
Thereby, the power receiving terminals T1u, T1v, T1w of each phase are respectively arranged at the third outer positions in the radial direction in the slot S, and the neutral point terminals T0u, T0v, T0w of the respective phases are arranged in the slot S. They are arranged on the innermost side in the inner radial direction. In addition, the power receiving terminals T1u, T1v, and T1w of each phase are arranged at positions close to each other. Similarly, the neutral point terminals T0u, T0v, T0w of the respective phases are also arranged in positions close to each other inside the power receiving terminals T1u, T1v, T1w of the respective phases.

  Therefore, the neutral line L1n that connects the neutral point terminals T0u, T0v, and T0w of each phase is disposed inside the power receiving terminals T1u, T1v, and T1w of each phase. As a result, as shown in FIG. 3, the lead lines L1u, L1v, and L1w drawn from the power receiving terminals T1u, T1v, and T1w of the respective phases are arranged outside the neutral line L1n.

Then, if the neutral point terminals T0u, T0v, T0w of each phase are connected to each other by a neutral line L1n, and the power receiving terminals T1u, T1v, T1w of each phase are the receiving ends, the three-phase Y of the first system Wires for connection are formed, and an electric circuit as shown in FIG. 14 is formed. In the figure, “L1” indicates that the respective windings circulate from the power receiving terminals T1u, T1v, T1w, and the separation end of the connection conductor portion OSc of the outer conductor OS and the connection conductor portion ISc of the inner conductor IS are separated. Indicates the inductance to the connection point with the end. Also. “L2” is from the connection point between the separation end of the connection conductor portion OSc of the outer conductor OS and the separation end of the connection conductor portion ISc of the inner conductor IS to each neutral point terminal T0u, T0v, T0w. Indicates inductance.
(Second system, three-phase winding)
Next, the second system three-phase winding will be described.

  The second system three-phase winding is a three-phase Y-connection as in the first system three-phase winding. Then, each of the three-phase windings of the second system is wound around each of the slots S with a shift of one slot pitch from the corresponding three-phase windings of the first system.

Accordingly, as shown in FIGS. 15 and 16, the second U2-phase winding is wound around each slot S with a one-slot pitch shift from the first U1-phase winding.
Slots S having slot numbers shown in Table 1 are assigned to slots S used for the U2 phase winding of the second system, and ten segments SG1a to SG10a are used.

  Here, the first segment SG1a is inserted into the slot S with slot numbers “1” and “7”. The second segment SG2a is inserted into slot S with slot numbers “7” and “13”. The third segment SG3a is inserted into slot S with slot numbers “13” and “19”. The fourth segment SG4a is inserted into slot S with slot numbers “19” and “25”. The fifth segment SG5a is inserted into slot S with slot numbers “25” and “31”.

  Further, the sixth segment SG6a is inserted into the slot S with slot numbers “31” and “37”. The seventh segment SG7a is inserted into slot S with slot numbers “37” and “43”. The eighth segment SG8a is inserted into slot S with slot numbers “43” and “49”. The ninth segment SG9a is inserted into slot S with slot numbers “49” and “55”. The tenth segment SG10a is inserted into slot S with slot numbers “55” and “1”.

  Similarly to the U1 phase winding of the first system, the segments SG1a to SG10a are connected to form the U2 phase winding of the second system. The other V2-phase and W2-phase windings of the second system three-phase windings are also wound in the same manner as the U2-phase windings.

  Further, the second system three-phase winding is similarly configured with a three-phase Y connection. Therefore, the neutral point terminals T0ua, T0va, T0wa connected to the neutral point N2 (see FIG. 17) and the power receiving terminals T2u, T2v, T2w for receiving power are determined for the windings of each phase.

In addition, about the winding of each phase of 2nd system | strain 3 phase winding, the welding end of each segment SG seems to align uniformly with welding member B1, B2 of segment SG of 1st system | strain 3 phase winding in an axial direction. 1 to 4, the welding members B1 and B2 of all the segments SG are welded so as to be evenly aligned in the axial direction. As a result, the distance between the front end of all the segments SG and the front end plate 4 is the same.
(Setting of neutral point terminal and power receiving terminal)
As shown in FIGS. 6 and 7, in the present embodiment, the neutral point terminal T0ua and the power receiving terminal T2u with respect to the U2 phase winding are in relation to the neutral point terminal T0u and the power receiving terminal T1u of the U1 phase. Provided at positions that oppose each other by 180 degrees in the circumferential direction. Therefore, with respect to the U2-phase winding, the outer conductor OS of the fifth segment SG5a and the connecting conductor portions OSc and ISc of the inner conductor IS are separated.

  Here, similarly to the U1-phase winding, as shown in FIG. 16, the one connected to the fourth conductor portion OSo of the outer conductor OS and the separated end of the connecting conductor portion OSc of the outer conductor OS, and the inner conductor IS To the second conductor portion ISi of the inner conductor IS which is the separated end of the connecting conductor portion ISc.

  And the direction which is the separation end of the connection conductor part OSc of the outer conductor OS and is connected to the first conductor part OSi of the outer conductor OS is defined as a neutral point terminal T0ua of the U2 phase. On the other hand, the one connected to the third conductor portion ISo of the inner conductor IS and the separated end of the connecting conductor portion ISc of the inner conductor IS is defined as a U2-phase power receiving terminal T2u.

  That is, the neutral point terminal T0ua is a terminal drawn out from the first conductor portion OSi of the outer conductor OS arranged on the innermost side in the radial direction in the slot S of the slot number “25”. Further, the power receiving terminal T2u is a terminal drawn from the third conductor portion ISo of the inner conductor IS arranged third outside in the radial direction in the slot S of the slot number “31”.

  Therefore, the power receiving terminal T2u is arranged on the outer side in the radial direction in the slot S than the neutral point terminal T0ua. The U2-phase power receiving terminal T2u and the neutral point terminal T0ua are arranged at positions that oppose each other by 180 degrees in the circumferential direction of the stator core 7 with respect to the U1-phase power receiving terminal T1u and the neutral point terminal T0u. The

  Next, with respect to the V2-phase winding, the neutral point terminal T0va and the power receiving terminal T2v are provided at positions opposite to the V1 phase neutral point terminal T0v and the power receiving terminal T1v in the circumferential direction by 242 degrees. . Therefore, as shown in FIG. 7, with respect to the V2-phase winding, the outer conductor OS of the segment SG and the connecting conductor portions OSc and ISc of the inner conductor IS inserted in the slot numbers “33” and “39” are separated.

  Similarly, the separated end of the connecting conductor portion OSc of the outer conductor OS and the fourth conductor portion OSo of the outer conductor OS, and the separated end of the connecting conductor portion ISc of the inner conductor IS and the inner conductor IS. The one connected to the second conductor portion ISi is connected.

  Further, the V2 phase neutral point terminal T0va is the separation end of the connecting conductor portion OSc of the outer conductor OS and the one connected to the first conductor portion OSi of the outer conductor OS. On the other hand, the one connected to the third conductor portion ISo of the inner conductor IS and the separation end of the connecting conductor portion ISc of the inner conductor IS is defined as a V2-phase power receiving terminal T2v.

  That is, the neutral point terminal T0va is a terminal drawn out from the first conductor portion OSi of the outer conductor OS arranged on the innermost side in the radial direction in the slot S of the slot number “33”. The power receiving terminal T2v is a terminal drawn from the third conductor portion ISo of the inner conductor IS arranged at the third outer position in the radial direction in the slot S of the slot number “39”. Therefore, the power receiving terminal T2v is disposed outside the neutral point terminal T0va in the radial direction in the slot S.

  Next, with respect to the W2-phase winding, the neutral point terminal T0wa and the power receiving terminal T2w are provided at positions facing the neutral point terminal T0w and the power receiving terminal T1w in the circumferential direction by 138 degrees in the circumferential direction. . Therefore, as shown in FIG. 7, the outer conductor OS of the segment SG and the connecting conductor portions OSc and ISc of the inner conductor IS inserted in the slot numbers “29” and “35” are separated for the W2-phase winding.

  Similarly, the separated end of the connecting conductor portion OSc of the outer conductor OS and the fourth conductor portion OSo of the outer conductor OS, and the separated end of the connecting conductor portion ISc of the inner conductor IS and the inner conductor IS. The one connected to the second conductor portion ISi is connected.

  Further, the W2 phase neutral point terminal T0wa is connected to the first conductor portion OSi of the outer conductor OS, which is the separation end of the connecting conductor portion OSc of the outer conductor OS. On the other hand, the W2 phase power receiving terminal T2w is the separated end of the connecting conductor portion ISc of the inner conductor IS and connected to the third conductor portion ISo of the inner conductor IS.

  That is, the neutral point terminal T0wa is a terminal drawn out from the first conductor portion OSi of the outer conductor OS arranged on the innermost side in the radial direction in the slot S of the slot number “29”. The power receiving terminal T2w is a terminal drawn from the third conductor portion ISo of the inner conductor IS disposed at the third outer position in the radial direction in the slot S of the slot number “35”. Therefore, the power receiving terminal T2w is disposed outside the neutral point terminal T0wa in the radial direction in the slot S.

  Thereby, the power receiving terminals T2u, T2v, T2w of each phase are respectively arranged at the third outer positions in the radial direction in the slot S, and the neutral point terminals T0ua, T0va, T0wa of each phase are arranged in the slot S. They are arranged on the innermost side in the inner radial direction. In addition, the power receiving terminals T2u, T2v, and T2w of each phase are arranged at positions close to each other. Similarly, the neutral point terminals T0ua, T0va, T0wa of the respective phases are also arranged in positions close to each other inside the power receiving terminals T2u, T2v, T2w of the respective phases.

  Therefore, the neutral line L2n that connects the neutral point terminals T0ua, T0va, T0wa of each phase is disposed inside the power receiving terminals T2u, T2v, T2w of each phase. As a result, as shown in FIG. 3, the lead lines L2u, L2v, and L2w drawn from the power receiving terminals T2u, T2v, and T2w of the respective phases are arranged on the outer side in the radial direction from the neutral line L2n.

  Then, if the neutral point terminals T0ua, T0va, T0wa of each phase are connected to each other and the power receiving terminals T2u, T2v, T2w of each phase are drawn out, the winding of the second phase three-phase Y connection is formed. An electric circuit as shown in FIG. 17 is formed. In the drawing, “L1” indicates that the respective windings circulate from the power receiving terminals T2u, T2v, and T2w, and the separation end of the connection conductor portion OSc of the outer conductor OS and the connection conductor portion ISc of the inner conductor IS are separated. Indicates the inductance to the connection point with the end. Also. “L2” is from the connection point between the separation end of the connection conductor portion OSc of the outer conductor OS and the separation end of the connection conductor portion ISc of the inner conductor IS to each neutral point terminal T0ua, T0va, T0wa. Indicates inductance.

  As described above, the rotor 11 is disposed inside the stator 6 around which the first system three-phase winding and the second system three-phase winding are wound, as shown in FIG. The rotor 11 is fixedly inserted into the rotary shaft 12. In this embodiment, the rotating shaft 12 is a non-magnetic metal shaft, and is rotatably supported by bearings 14 and 15 provided on the rear cover wall 3 a of the cylindrical housing 3 and the front end plate 4. The rotor 11 fixed to the rotating shaft 12 is a rotor having a consequent pole type structure.

As shown in FIGS. 1 and 18 to 21, the rotor 11 has a rotor core 16 formed by laminating a plurality of rotor core pieces 16 a made of steel plates, and is fixed to the rotating shaft 12.
As shown in FIG. 21, the rotor core 16 is formed in a cylindrical shape with a fixed interval between a shaft-fixed cylinder portion 21 fixed to the rotary shaft 12 and an outer peripheral surface of the cylinder-shaped shaft-fixed cylinder portion 21. It has a magnet fixing cylinder part 22 to be included, and a bridging part 23 for connecting and holding the shaft fixing cylinder part 21 and the magnet fixing cylinder part 22 at regular intervals.

  Five fan-shaped recesses 22a are recessed in the axial direction on the outer peripheral surface of the magnet fixing cylinder portion 22 at equal angular intervals. And the five salient poles 24 are formed between the recessed part 22a and the recessed part 22a by forming the fan-shaped recessed part 22a.

  As shown in FIG. 20, magnets MG are fixedly arranged in the recesses 22a formed at equal intervals in the circumferential direction. The five magnets MG are arranged with respect to the rotor core 16 so that the inner surface in the radial direction is an N pole and the stator side surface in the radial direction is an S pole (first magnetic pole). As a result, the outer surface (stator side) of the salient pole 24 adjacent to the magnet MG in the circumferential direction becomes an N pole (second magnetic pole) that is a magnetic pole different from the outer surface of the magnet MG.

  As shown in FIG. 19, the stator 6 for the rotor 11 of the present embodiment has the number of magnets MG (= number of pole pairs) of the rotor 11 as “p” (where p is an integer of 2 or more), SC winding. The number of phases 9 is “m” and the number of teeth 9 “Z” is “Z = 2 × p × m × n (number)” (where “n” is a natural number).

Incidentally, in this embodiment, based on this mathematical formula, the number of teeth 9 “Z” is
Z = 2 × 5 (number of magnets MG) × 3 (number of phases) × 2 = 60 (pieces)
It becomes.

  There are five bridging portions 23 that connect and hold the shaft-fixed tube portion 21 and the magnet-fixed tube portion 22, and each bridging portion 23 extends radially from the outer surface of the shaft-fixed tube portion 21 to fix the magnet. The inner surface of the cylindrical portion 22 is connected. The five bridging portions 23 are arranged at equal intervals in the circumferential direction, and the five bridging portions 23 arranged at the equal intervals are formed to extend along the axial direction.

  The connecting position of each bridging part 23 to the inner surface of the magnet fixing cylinder part 22 is connected to a position corresponding to the concave part 22a to which the magnet MG is fitted and fixed. Moreover, each bridging portion 23 is connected so that the radial center line of the bridging portion 23 extending in the radial direction is orthogonal to the center position of the circumferential width of the magnet MG.

  Therefore, the space formed between the outer side surface of the shaft fixing cylinder portion 21 and the inner side surface of the magnet fixing cylinder portion 22 is arranged at equal intervals in the circumferential direction and divided into five by the five bridging portions 23. Thus, five gaps 25 (small magnetic lightweight portions) penetrating in the axial direction are formed.

  Since the air gap 25 is smaller in specific gravity and magnetism than the rotor core material made of laminated steel plate, the rotor core 16 is lightened by forming this air gap 25 (small magnetic light weight part), and the weight of the entire motor is reduced. Can do.

  Cover fixing holes 26 that are recessed in the axial direction are formed on both side surfaces of the magnet fixing cylinder portion 22 in the axial direction and at positions close to the bridging portion 23 side. As shown in FIG. 18, each cover fixing hole 26 is used when fixing a rotor cover 27 that covers the outer periphery of the rotor core 16.

  The rotor cover 27 has a cylindrical cover portion 27a. The cover portion 27a is bent in the direction of the rotary shaft 12 so as to cover the side surface of the magnet fixing cylinder portion 22 from the opening end on the front end plate 4 side, and an annular reinforcing rib 27b is provided. As shown in FIG. 18, an engagement protrusion 27c (see FIG. 1) is formed at a position corresponding to each cover fixing hole 26 on the inner peripheral portion of the annular reinforcing rib 27b. The engagement protrusions 27 c are formed by bending so that each engagement protrusion 27 c is fitted into the corresponding cover fixing hole 26, and the cover portion 27 a of the rotor cover 27 is supported and fixed to the rotor core 16.

  In addition, the opening end of the cover portion 27a on the rear cover wall 3a side is fixed to the outer peripheral end of the side plate 27d by an annular side plate 27d that covers the side surface of the magnet fixing cylinder portion 22 on the rear cover wall 3a side.

  A first housing recess 31 is formed inside the rear cover wall 3a of the cylindrical housing 3 at a position facing the neutral line L1n of the first system three-phase winding wired to the stator 6, and the first housing The recess 31 is provided with a space in which the neutral line L1n is interposed. As a result, the neutral wire L1 projecting toward the rear cover wall 3a can be released in the axial direction by the first housing recess 18, and the physique in the axial direction of the motor can be reduced accordingly.

  A first through hole H <b> 1 is formed in the first accommodation recess 31. The first through hole H1 formed in the first accommodating recess 31 is a long hole and is a power receiving terminal T1u, T1v for each phase of the first system three-phase winding formed adjacent to the neutral line L1n. , T1w. And each lead-out line L1u, L1v, L1w withdraw | derived from electric power receiving terminal T1u, T1v, T1w penetrates the 1st through-hole H1, and is guided in the storage box 5 as shown in FIG. ing.

  Further, a second housing recess 32 is formed inside the rear cover wall 3a of the cylindrical housing 3 at a position facing the neutral line L2n of the second system three-phase winding wired to the stator 6, 2 A space in which the neutral wire L2n is interposed is provided in the housing recess 32. As a result, the neutral wire L2 projecting toward the rear cover wall 3a can be released in the axial direction by the second housing recess 32, and the physique in the axial direction of the motor can be reduced accordingly.

  A second through hole H <b> 2 is formed in the second accommodation recess 32. The second through hole H2 formed in the second accommodating recess 32 is a long hole and is a power receiving terminal T2u, T2v for each phase of the second three-phase winding formed adjacent to the neutral line L2n. , T2w. As shown in FIG. 1, the lead lines L2u, L2v, L2w drawn from the power receiving terminals T2u, T2v, T2w pass through the second through hole H2 and are guided into the storage box 5. ing.

  A drive device 40 is housed in the housing box 5 fixed on the outside of the rear cover wall 3a. The circuit board 41 of the driving device 40 includes a rotation sensor 42 for controlling the rotation of the rotor 11, an ECU (electronic control unit) 43, first switching transistors Q1u, Q1v, Q1w, second switching transistors Q2u, Q2v, Q2w, and the like. Various circuit elements are mounted.

  The rotation sensor 42 is mounted on the circuit board 41 so as to face the rotation shaft 12 that protrudes outward in the axial direction from the rear cover wall 3a. The rotation sensor 42 is formed of a Hall IC in this embodiment, and detects the rotation angle of the detection magnet 42a that rotates integrally with the rotation sensor 42 fixed to the shaft end surface of the rotation shaft 12.

  The ECU (electronic control unit) 43 has a microcomputer. Based on the detection signal from the rotation sensor 42, the ECU 43 detects the rotation angle, rotation speed, and the like of the brushless motor 1 at that time. Then, the ECU 43 calculates the power supply timing to each phase of the first system three-phase winding and the second system three-phase winding. That is, the ECU 43 supplies the three-phase alternating current supplied to the second system three-phase winding with the phase difference of 30 electrical angles to the three-phase alternating current supplied to the first system three-phase winding.

  The first switching transistors Q1u, Q1v, and Q1w are, for example, power MOS transistors, and are on / off controlled based on a control signal from the ECU 43. The first switching transistors Q1u, Q1v, and Q1w are controlled to be supplied to each phase of the first three-phase winding by being turned on / off at a predetermined timing. As a result, a rotating magnetic field generated by the first system three-phase winding is generated in the stator 6.

  The first switching transistors Q1u, Q1v, and Q1w mounted on the circuit board 41 are opposite to the power receiving terminals T1u, T1v, and T1w of each phase formed in the first system three-phase winding when viewed from the axial direction. Has been implemented. The circuit board 41 is connected to the first switching transistors Q1u, Q1v, Q1w of the circuit board 41, and is located at a position on the outer peripheral side in the radial direction of the circuit board 41 opposite to the power receiving terminals T1u, T1v, T1w when viewed from the axial direction. Are formed with output terminals O1u, O1v, O1w for supplying power to each phase.

  Accordingly, the lead lines L1u, L1v, L1w led out from the power receiving terminals T1u, T1v, T1w of each phase pass through the first through holes H1 formed in the rear cover wall 3a, and the power receiving terminals T1u, T1v of each phase. , T1w and the output terminals O1u, O1v, O1w are connected to the respective phases with the shortest distance in the axial direction.

  The second switching transistors Q2u, Q2v, Q2w are, for example, power MOS transistors, and are on / off controlled based on a control signal from the ECU 43. The second switching transistors Q2u, Q2v, Q2w are controlled to supply power to each phase of the second system three-phase winding by being turned on / off at a predetermined timing. Thereby, a rotating magnetic field by the second system three-phase winding is generated in the stator 6.

  The second switching transistors Q2u, Q2v, Q2w mounted on the circuit board 41 are opposite to the power receiving terminals T2u, T2v, T2w of the respective phases formed in the second system three-phase winding when viewed from the axial direction. Has been implemented. An output for supplying power to each phase is connected to the first switching transistors Q1u, Q1v, Q1w of the circuit board 41, and is opposed to the power receiving terminals T2u, T2v, T2w when viewed from the axial direction. Terminals O2u, O2v, and O2w are formed, respectively.

  Accordingly, the lead lines L2u, L2v, and L2w led out from the power receiving terminals T2u, T2v, and T2w of each phase pass through the second through hole H2 formed in the rear cover wall 3a, and the power receiving terminals T2u, T2v of each phase. , T2w and each phase are connected to the output terminals O2u, O2v, O2w at the shortest distance in the axial direction.

  The brushless motor 1 according to the present embodiment is used in an electric power steering device or the like, and a rotating shaft 12 of the rotor 11 is connected to a speed reducer (not shown), and a driven part is connected via the speed reducer. It is connected to a counterpart shaft such as a steering shaft (not shown), and drives the counterpart shaft such as the steering shaft.

Next, the operation of the above embodiment will be described.
The rotor core 16 of the brushless motor 1 is provided with a shaft fixing cylinder portion 21 fixed to the rotating shaft 12 and a magnet fixing cylinder portion 22 that encloses the outer peripheral surface of the shaft fixing cylinder portion 21 with a certain interval therebetween. The part 21 and the magnet fixing cylinder part 22 were formed by the bridging part 23. The rotor core 16 has the gap 25 by forming the gap 25 formed by the bridging portion 23 between the outer side surface of the shaft fixing cylinder portion 21 and the inner side surface of the magnet fixing cylinder portion 22. The specific gravity decreases at.

  Further, since the gap 25 between the shaft fixing cylinder part 21 and the magnet fixing cylinder part 22 is small in magnetism, the magnetic flux of the magnet MG disposed in the recess 22a of the magnet fixing cylinder part 22 is applied to the adjacent salient pole 24. concentrate. And the magnetic balance of the salient pole 24 and the magnet MG which are alternately formed in the circumferential direction of the rotor core 16 is improved.

  Further, each bridging portion 23 has a magnet fixing cylinder portion 22 so that the central axis of the bridging portion 23 extending in the radial direction is perpendicular to the circumferential center position of the salient pole 24 with respect to the magnet fixing cylinder portion 22. As a result, the magnet MG magnetic flux is less likely to flow by the shaft fixing cylinder portion 21 via the bridging portion 23 and concentrates on the salient poles 24. And the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor is further improved, leading to reduction of cogging torque, lower noise, lower vibration, and higher output.

Next, the effect of the said embodiment is described below.
(1) According to this embodiment, the rotor core 16 can be reduced in weight by the gap 25 formed in the rotor core 16, and the weight of the entire motor can be reduced.

  In addition, since the gap 25 formed between the shaft fixing cylinder part 21 and the magnet fixing cylinder part 22 is small in magnetism, the magnetic flux of the magnet MG disposed in the recess 22a of the magnet fixing cylinder part 22 is applied to the adjacent salient pole 24. The magnetic balance between the salient poles 24 and the magnets MG that are alternately formed in the circumferential direction of the rotor core 16 can be improved.

  As a result, the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor core 16 is improved, and the cogging torque can be reduced, the noise is reduced, the vibration is reduced, and the output is increased. Moreover, the physique of the brushless motor 1 per output can be reduced by increasing the output.

  (2) According to the present embodiment, the bridging portion 23 is formed at an equal pitch in the circumferential direction between the shaft fixing cylinder portion 21 and the magnet fixing cylinder portion 22 with the gap 25 interposed therebetween. Therefore, the magnetic flux from the magnet MG of the magnet fixing cylinder portion 22 hardly flows to the shaft fixing cylinder portion 21 via these bridging portions 23 and concentrates on the salient poles 24 of the magnet fixing cylinder portion 22.

As a result, the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor is further improved, leading to reduction of cogging torque, low noise, low vibration, and high output.
(3) According to the present embodiment, each bridging portion 23 is configured so that the central axis of the bridging portion 23 extending in the radial direction is perpendicular to the circumferential center position of the salient pole 24. Since the magnet MG magnetic flux is connected to the inner peripheral surface, it is difficult for the magnet MG magnetic flux to flow by the shaft fixing cylinder portion 21 via the bridging portion 23 and concentrates on the salient pole 24. As a result, the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor is further improved, leading to reduction of cogging torque, low noise, low vibration, and high output.

  (4) According to this embodiment, the rotor core 16 is covered with the rotor cover 27. Therefore, even if the magnet MG fixed to the concave portion 22a of the rotor core 16 is peeled off from the concave portion 22a, it does not jump out of the rotor cover 27, so that surrounding components are not damaged.

  In addition, the rotor cover 27 is supported and fixed by a cover fixing hole 26 formed in the rotor core 16 (magnet fixing cylinder portion 22). Therefore, it is not necessary to provide a special part or the like for fixing the rotor cover and secure a space for mounting the special part in the motor.

  (5) According to this embodiment, the rotor core 16 is formed by laminating a plurality of rotor core pieces 16a made of laminated steel plates. Therefore, the magnetic resistance of the rotor core 16 increases in the axial direction, and the magnetic flux of the magnet MG hardly flows in the axial direction of the rotor core 16 and concentrates on the salient poles 24.

  In the continuous pole type rotor 11, the magnetism is generally easy to move in the rotor core 16, but the eddy current due to the magnetic movement suppressing effect of the air gap 25 as the small magnetic lightweight portion is suppressed. As a result, the generation of eddy current can be further suppressed. As a result, the output can be further increased, and the physique of the brushless motor 1 per output can be reduced.

  Similarly, the stator core 7 was formed by laminating a plurality of stator core pieces 7a made of laminated steel materials. Accordingly, the magnetic flux generated in the stator core 7 is difficult to flow in the axial direction and is concentrated at the tip of the tooth 9.

  (6) According to this embodiment, the rotating shaft 12 is formed of a nonmagnetic material. Accordingly, the magnetic flux of the magnet MG is less likely to flow through the rotary shaft 12 and concentrates on the salient poles 24. As a result, the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor is further improved, leading to reduction of cogging torque, low noise, low vibration, and high output.

  (7) According to the present embodiment, each power receiving terminal T1u, T1v, T1w, T2u, T2v, T2w of the SC winding of the stator 6 is welded between the tips of the segments SG provided on the front end plate 4 side. It was provided on the rear cover wall 3a side opposite to the members B1 and B2. Accordingly, the power receiving terminals T1u, T1v, T1w, T2u, T2v, T2w avoid the densely welded portions on the front end plate 4 side, and lead lines L1u, L1v, L1w, L2u, It can be connected to L2v and L2w, and the physique of the brushless motor 1 comprising the SC winding with a small cogging torque can be reduced.

  In addition, each power receiving terminal T1u, T1v, T1w, T2u, T2v, T2w is connected not to the welded portion between the ends of the segment SG but to a U-shaped segment SG having a dimension formed on the rear cover wall 3a side. Since the conductor portions ISc and OSc are formed, the clearance between the connecting conductor portions ISc and OSc of each U-shaped segment SG forming the SC winding and the rear cover wall 3a can be shortened, and the size of the brushless motor 1 can be reduced. .

  Also, the corresponding lead lines L1u, L1v, L1w, L2u, L2v, and L2w connected to the power receiving terminals T1u, T1v, T1w, T2u, T2v, and T2w are connected conductor portions ISc of the segment SG that is dimensionally formed. , OSc is pulled out in the axial direction as it is, and it becomes easy to connect the output terminals O1u, O1v, O1w, O2u, O2v, O2w provided on the circuit board 41 in the housing box 5.

  The power receiving terminals T1u, T1v, T1w, T2u, T2v, and T2w provided on the rear cover wall 3a side are drawn out in the axial direction to the first and second through holes H1 and H2 formed in the rear cover wall 3a, respectively. Because it is connected to the output terminals O1u, O1v, O1w, O2u, O2v, and O2w of the control circuit that passes through the lines L1u, L1v, L1w, L2u, L2v, and L2w and is adjacent to the rear cover wall 3a. The parts of the control circuit can be placed on the inner diameter side, and the physique of the brushless motor 1 having the control circuit becomes a small physique as a whole.

  Moreover, since the welding part of segment SG was made into the front end plate 4 side, ie, the opposite side to a control circuit, it can also suppress that the residue at the time of welding adheres to each circuit of the control circuit in the storage box 5, etc. it can.

  (8) According to the present embodiment, the power receiving terminals T1u, T1v, T1w, T2u, T2v, and T2w provided on the rear cover wall 3a side are respectively arranged at the third outer positions in the radial direction in the slot S. Therefore, the lead lines L1u, L1v, L1w, L2u, L2v, and L2w drawn in the axial direction face the circuit board 41 on which the components of the control circuit in the housing box 5 are mounted. Therefore, the output terminals O1u, O1v, O1w, O2u, O2v, and O2w are arranged outside the circuit board 41, and circuit components can be mounted inside the circuit board 41. The brushless motor 1 having a control circuit is provided. The physique can be made smaller overall

  (9) According to the present embodiment, the welding members B1 and B2 between the tips of the segments SG connected in the circumferential direction of the stator 6 disposed on the front end plate 4 side have the same axial length. It was made to become. Accordingly, the clearance between the front end plate 4 and the welding members B1 and B2 between the tip portions of the segments SG forming the SC winding can be shortened, and the physique in the axial direction of the brushless motor 1 can be reduced.

  (10) According to the present embodiment, the first and second housing recesses 18 and 19 are formed inside the rear cover wall 3a of the cylindrical housing 3 at positions facing the neutral wires L1n and L2n. Spaces in which the neutral lines L1n and L2n are interposed are provided in the first and second housing recesses 18 and 19, respectively. As a result, the neutral lines L1 and L2n projecting toward the rear cover wall 3a can be absorbed in the axial direction by the first and second receiving recesses 18 and 19, and the physique in the axial direction of the motor can be increased accordingly. Can be small.

  (11) According to the present embodiment, the power receiving terminals of the first and second system three-phase windings formed adjacent to the neutral wires L1n and L2n in the first and second housing recesses 18 and 19 First and second through holes H1 and H2 were formed in portions facing T1u, T1v, T1w, T2u, T2v, and T2w, respectively. Accordingly, the first and second through holes H1 can be made to have a minimum size enough to penetrate the lead lines L1u, L1v, L1w, L2u, L2v, and L2w, respectively. The movement of the foreign objects that come and go between them can be suppressed.

  (12) According to the present embodiment, 60 slots S are formed in the stator core 7 of the stator 6 and 60 teeth 9 are provided. Then, the first system three-phase winding and the second system three-phase winding were wound around 60 teeth 9. At this time, the three-phase windings of the second system were wound around the slots S by shifting one slot pitch with respect to the three-phase windings of the first system.

Then, the three-phase alternating current fed to the second system three-phase winding is fed with a phase difference of 30 electrical degrees with respect to the three-phase alternating current fed to the first system three-phase winding.
The torque ripple wave of the sixth component of the electrical angle generated in the first and second three-phase windings of the brushless motor 1 is 30 degrees, which is half the slot S of the first and second three-phase windings. (Electrical angle) is offset by the deviation. As a result, the torque ripple of the electrical angle sixth-order component generated in the brushless motor 1 can be eliminated.

The above embodiment may be modified as follows.
In the above embodiment, as shown in FIG. 23, each of the air gaps 25 is a groove in which the central position of the inner surface of the magnet fixing cylinder portion 22 forming the air gap 25 is deepest toward the stator side. 50 may be formed. In this case, the groove 50 is formed in an arc shape when the inner bottom surface is viewed from the axial direction, and both side surfaces of the arc-shaped inner bottom surface are edged in an arc shape so that the inner surface of the magnet fixed cylinder portion 22 is formed. It is good to be continuous.

As a result, the magnetic flux of the magnet MG is concentrated by the adjacent salient poles 24, and the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor 11 is further improved.
In the embodiment described above, each bridging portion 23 is formed such that the length in the axial direction is the same as the length in the axial direction of the shaft fixing cylinder portion 21 and the magnet fixing cylinder portion 22.

This may be performed by forming the length of each bridging portion 23 in the axial direction shorter than the length of the axially fixed tube portion 21 and the magnet fixed tube portion 22 in the axial direction as shown in FIG.
As a result, the magnetic resistance of the bridging portion 23 is further increased, and the magnetic flux of the magnet MG is less likely to flow in the direction of the rotating shaft 12 and is concentrated on the salient poles 24. As a result, the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor 11 is improved.

  In the above embodiment, each bridging portion 23 is connected to the inner peripheral surface of the magnet fixing cylinder portion 22 and at a position facing the concave portion 22a to which the magnet MG is fixed. As shown in FIG. 25, this may be performed by connecting each bridging portion 23 to a position on the inner peripheral surface of the magnet fixing cylinder portion 22 and facing the salient pole 24.

  In this case, the second air gap 55 (small magnetic lightweight portion) may be formed in the axial direction on the side surface of the magnet fixing cylinder portion 22 on the extension line of each bridging portion 23. As a result, the magnetic flux of the magnet MG is easily concentrated on the salient poles 24 by the second gap 55, and the magnetic balance of the magnetic poles alternately formed in the circumferential direction of the rotor 11 can be further improved. The weight can be further reduced.

  Of course, in the above-described embodiment, the second gap 55 (small magnetic lightweight portion) may be formed in the axial direction on the side surface of the magnet fixing cylinder portion 22 on the extension line of each bridging portion 23. In this case, the rotor cover 27 may be fixed using the second gap 55 (small magnetic light weight portion) as the cover fixing hole 26.

  In the above embodiment, the small magnetic lightweight part is formed by the gap 25. The specific gravity and magnetism are not generated in the space between the shaft fixing tube portion 21 and the magnet fixing tube portion 22 without connecting the shaft fixing tube portion 21 and the magnet fixing tube portion 22 with the bridging portion 23. For example, a small synthetic resin may be filled and the shaft fixing cylinder part 21 and the magnet fixing cylinder part 22 may be connected and fixed.

  Of course, the space between the shaft fixing cylinder portion 21 and the rotary shaft 12 is directly filled with a synthetic resin having a specific gravity and magnetism smaller than that of the shaft fixing cylinder portion 21 as a small magnetic lightweight portion, and the shaft is fixed via the synthetic resin. The cylindrical portion 21 and the rotary shaft 12 may be connected and fixed.

  In the above embodiment, the separation end of the connecting conductor portion OSc of the outer conductor OS and the one connected to the first conductor portion OSi of the outer conductor OS is used as the neutral point terminal, and the connecting conductor portion ISc of the inner conductor IS is connected. The one connected to the third conductor portion ISo of the inner conductor IS at the separation end was defined as a power receiving terminal.

  For example, a power receiving terminal is a separation end of the connection conductor portion OSc of the outer conductor OS and is connected to the first conductor portion OSi of the outer conductor OS, and a separation end of the connection conductor portion ISc of the inner conductor IS. In this case, the neutral conductor terminal may be used to connect to the third conductor portion ISo of the inner conductor IS. In this case, the power receiving terminal of each phase is arranged inside in the radial direction in the slot S from the neutral point terminal of each phase. Therefore, when the output terminals O1u, O1v, O1w, O2u, O2v, and O2w are formed around the central portion of the circuit board 41 due to wiring layout restrictions, the lead lines L1u and L1v are formed in each phase formed on the circuit board 41. , L1w, L2u, L2v, and L2w can be made the shortest without crossing the neutral lines L1n and L2n arranged outside.

  In the above embodiment, the number of slots S is 60 in the above embodiment, but the present invention is not limited to this. For example, the number of slots S may be changed to 45, etc. May be.

  In the embodiment described above, in order to minimize the wiring length of the leader line, the power receiving terminals T1u, T1v, T1w of each phase of the first system three-phase Y-connection winding are connected to the W1 phase, V1 in the circumferential direction. The power receiving terminals T2u, T2v, and T2w of each phase of the second system three-phase Y-connection winding are arranged in the order of the U2, W2, and V2 phases in the circumferential direction.

  Matching this with the power receiving terminals T1u, T1v, T1w of each phase of the first system three-phase Y connection winding, the power receiving terminals T2u, T2v, T2w of each phase of the second system three phase Y connection winding are set. In the circumferential direction, W2 phase, V2 phase, and U2 phase may be arranged in this order.

  In this case, in FIG. 7, the W2-phase power receiving terminal T2w and the neutral point terminal T0wa of the second system three-phase Y-connection winding are the segments SG inserted into the slots S of the slot numbers “23” and “29”. Is formed. That is, for the segment SG inserted in the slot S with slot numbers “23” and “29”, the connecting conductor part OSc of the outer conductor OS for wave winding and the connecting conductor part ISc of the inner conductor IS for lap winding are respectively set. To separate. And after connecting in the same manner as described above, the separation end connected to the third conductor portion ISo of the inner conductor IS is a W2 phase power receiving terminal T2w, and the separation end connected to the first conductor portion OSi of the outer conductor OS is The neutral point terminal T0wa of the W2 phase is used.

  Further, the W2 phase power receiving terminal T2v and the neutral point terminal T0va are formed by the segments SG inserted in the slots S having the slot numbers “27” and “33”. That is, for the segment SG inserted in the slot S with slot numbers “27” and “33”, the connecting conductor portion OSc of the wave winding outer conductor OS and the connecting conductor portion ISc of the inner conductor IS for lap winding are respectively set. To separate. After the connection in the same manner as described above, the separation end connected to the third conductor portion ISo of the inner conductor IS is the V2 phase power receiving terminal T2v, and the separation end connected to the first conductor portion OSi of the outer conductor OS is the W2 phase. The neutral point terminal T0va.

  Further, the U2-phase power receiving terminal T2u and the neutral point terminal T0ua are formed by the segment SG inserted in the slot S having the slot numbers “31” and “37”. That is, for the segment SG inserted into the slot S with slot numbers “31” and “37”, the connecting conductor part OSc of the outer conductor OS for wave winding and the connecting conductor part ISc of the inner conductor IS for lap winding are respectively set. To separate. Then, after connecting in the same manner as described above, the separation end connected to the third conductor portion ISo of the inner conductor IS is the U2 phase power receiving terminal T2u, and the separation end connected to the first conductor portion OSi of the outer conductor OS is the U2 phase. Let the neutral point terminal T0ua be.

Even in this case, the power receiving terminals T2u, T2v, T2w of each phase can be arranged outside the neutral point terminals T0ua, T0va, T0wa in the radial direction.
In the above embodiment, the power receiving terminal and the neutral point terminal are separated by the connecting conductor portion OSc of the outer conductor OS for wave winding and the connecting conductor portion ISc of the inner conductor IS for lap winding, respectively. One side is electrically connected to the separation end connected to the fourth conductor portion OSo of the outer conductor OS and the separation end connected to the second conductor portion ISi of the inner conductor IS, and the other side is used without using the other side. A first one-side segment having the same configuration as that of the other separated conductor IS and integrally formed with a lead portion extending in the axial direction connected to the third conductor portion ISo is used as the lead portion for the power of each phase. The power receiving terminals T1u, T1v, T1w, T2u, T2v, and T2w are the same form of the other separated outer conductor OS, and are connected to the first conductor portion OSi and extend in the axial direction. Using a second one segment formed body, the lead portions of each phase of the neutral point terminal T0u, T0v, T0w, T0ua, T0va, may be T0wa.

  In this case, in the first one-side segment integrally formed with the extending portion extending in the axial direction, when the extracted portion is the power receiving terminals T1u, T1v, T1w, T2u, T2v, T2w, the power receiving terminals T1u, T1v. , T1w, T2u, T2v, and T2w become lead lines L1u, L1v, L1w, L2u, L2v, and L2w.

  In the above embodiment, for the SC winding, the wave winding outer conductor OS and the lap winding inner conductor IS are alternately connected in the circumferential direction, but only the wave winding inner conductor IS. May be connected in the circumferential direction, or only the outer conductor OS for lap winding may be connected in the circumferential direction.

  In the above embodiment, the number of magnets MG is five, but is not limited to this, and may be two, three, four, or more. Of course, the number of slots S of the stator may be changed as appropriate.

In the above-described embodiment, the stator core 7 is implemented by the SC winding using the segment SG. However, the stator core 7 may be implemented as a multi-phase winding by winding a normal copper wire, for example.
In the above embodiment, the rotor 11 having a consequent pole structure is embodied in a so-called SPM (Surface Permanent Magnet Motor) type, but may be applied to an IPM (Interior Permanent Magnet Motor) type rotor.

  In the above embodiment, the brushless motor 1 is an EPS motor used in an electric power steering device (EPS). However, the brushless motor 1 is applied to other motors such as a power window motor and a wiper drive motor. Also good.

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor (motor), 2 ... Motor case, 3 ... Cylindrical housing, 3a ... Rear cover wall (rear cover), 4 ... Front end plate, 5 ... Storage box, 6 ... Stator, 7 ... Stator core, 7a ... Stator core piece , 8 ... Cylindrical part, 9 ... Teeth, 10 ... Insulator, 11 ... Rotor (continuous rotor), 11a ... Rotor core piece 11a (rotor core material), 12 ... Rotating shaft, 14, 15 ... Bearing, 16 ... Rotor core, 21 ... Axis fixed cylinder part, 22 ... Magnet fixed cylinder part, 22a ... Recessed part, 23 ... Bridge part, 24 ... Salient pole, 25 ... Air gap, 26 ... Cover fixing hole, 27 ... Rotor cover, 27a ... Cover part, 27b ... Reinforcement Ribs, 27c ... engagement projections, 27d ... side plate, 31 ... first housing recess, 32 ... second housing recess, 40 ... driving device, 41 ... circuit board, 42 ... rotation center S, 42a ... detection magnet, 43 ... ECU (electronic control unit), 50 ... groove, 55 ... second gap, B1, B2 ... welding member, S ... slot, S1-S4 ... tip surface, H1 ... first Through hole, H2 ... second through hole, IS ... inner conductor, MG ... magnet, N1, N2 ... neutral point, OS ... outer conductor, SG ... segment, ISc, OSc ... connecting conductor, ISi ... second conductor , ISo ... third conductor, IWi ... second weld, IWo ... third weld, L1n, L2n ... neutral wire, L1u, L1v, L1w, L2u, L2v, L2w ... lead wire, O1u, O1v, O1w , O2u, O2v, O2w ... output terminal, OSi ... first conductor part, OSo ... fourth conductor part, OWi ... first welding part, OWo ... fourth welding part, Q1u, Q1v, Q1w ... first switching transistor, Q2u , Q2 , Q2w... Second switching transistor, SG1 to SG10, SG1a to SG10a... Segment, T0u, T0v, T0w, T0ua, T0va, T0wa. .

Claims (18)

A continuous rotor in which magnetic poles of 2 × p poles (where p is the number of pole pairs) are alternately arranged in the circumferential direction;
A core having 2 × p × m × n (where m is the number of phases of the stator winding and n is a natural number) teeth and slots facing the rotor provided in a plurality in the radial direction, and the slots A brushless motor comprising a stator having a multiphase winding wound around
The slots of the stator are formed to have the same circumferential width in the radial direction, and the windings are arranged in a row in the radial direction without overlapping the windings in the circumferential direction,
The rotor core of the continuous rotor has recesses formed on the outer peripheral surface at equal pitches in the circumferential direction, and a magnet is disposed with respect to each recess such that the first magnetic pole faces the stator side, A second magnetic pole different from the first magnetic pole is formed on the salient pole formed between the recess and the rotor core , and the rotor core is disposed at a radially inner position of at least one of the recess and the salient pole. A small magnetic lightweight part having a specific gravity and magnetism smaller than that of the material is formed, and in the rotor core, the recess and the salient pole are formed on an outer peripheral surface of a magnet fixing part extending radially outward of the small magnetic lightweight part. And
The rotor core is formed by laminating a plurality of rotor core pieces made of steel plates,
The rotor core piece is formed with a magnet fixing portion constituting portion extending in the circumferential direction on the outer side in the radial direction of the constituting portion of the small magnetic lightweight portion, and the concave portion constituting portion is circumferentially provided on the outer peripheral surface of the magnet fixing portion constituting portion. The small magnetic properties of the rotor core pieces that are formed in a pitch and are formed in the axial direction by forming salient pole constituent portions between the concave portion constituent portions and the concave portion constituent portions on the outer peripheral surface of the magnet fixing portion constituent portions. The small magnetic lightweight part is formed by a component part of the lightweight part, the magnet fixing part is formed by the magnet fixing part component part of the rotor core piece laminated in the axial direction, and the rotor core piece laminated in the axial direction is formed. The brushless motor , wherein the concave portion is formed by the concave portion forming portion, and the salient pole is formed by the salient pole forming portion of the rotor core piece laminated in the axial direction . A continuous rotor in which magnetic poles are alternately arranged in the circumferential direction; and a stator in which a multi-phase winding consisting of SC windings is wound around a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor; A brushless motor with
The slots of the stator are formed to have the same circumferential width in the radial direction, and the windings are arranged in a row in the radial direction without overlapping the windings in the circumferential direction,
The rotor core of the continuous rotor has recesses formed on the outer peripheral surface at equal pitches in the circumferential direction, and a magnet is disposed with respect to each recess such that the first magnetic pole faces the stator side, A second magnetic pole different from the first magnetic pole is formed on the salient pole formed between the recess and the rotor core , and the rotor core is disposed at a radially inner position of at least one of the recess and the salient pole. A small magnetic lightweight part having a specific gravity and magnetism smaller than that of the material is formed, and in the rotor core, the recess and the salient pole are formed on an outer peripheral surface of a magnet fixing part extending radially outward of the small magnetic lightweight part. And
The rotor core is formed by laminating a plurality of rotor core pieces made of steel plates,
The rotor core piece is formed with a magnet fixing portion constituting portion extending in the circumferential direction on the outer side in the radial direction of the constituting portion of the small magnetic lightweight portion, and the concave portion constituting portion is circumferentially provided on the outer peripheral surface of the magnet fixing portion constituting portion. The small magnetic properties of the rotor core pieces that are formed in a pitch and are formed in the axial direction by forming salient pole constituent portions between the concave portion constituent portions and the concave portion constituent portions on the outer peripheral surface of the magnet fixing portion constituent portions. The small magnetic lightweight part is formed by a component part of the lightweight part, the magnet fixing part is formed by the magnet fixing part component part of the rotor core piece laminated in the axial direction, and the rotor core piece laminated in the axial direction is formed. The brushless motor , wherein the concave portion is formed by the concave portion forming portion, and the salient pole is formed by the salient pole forming portion of the rotor core piece laminated in the axial direction . A continuous rotor in which magnetic poles of 2 × p poles (where p is the number of pole pairs) are alternately arranged in the circumferential direction;
A core having 2 × p × m × n (where m is the number of phases of the stator winding and n is a natural number) teeth and slots facing the rotor provided in a plurality in the radial direction, and the slots A stator having a multi-phase winding wound around
A brushless motor with
The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, and is formed between the magnets and the magnet side. Are formed with a second magnetic pole different from the first magnetic pole,
The rotor core of the continuous rotor is
A shaft-fixing tube portion fixed to the rotating shaft;
A magnet-fixed tube portion including the shaft-fixed tube portion at a constant interval, wherein the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side;
A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval.
Have
In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion,
Each of the bridging portions is connected to the inner peripheral surface of the magnet fixing cylinder portion so that the radial central axis of the bridging portion extending in the radial direction is orthogonal to the circumferential central position of the second magnetic pole. A brushless motor characterized by A continuous rotor in which magnetic poles are alternately arranged in the circumferential direction; and a stator in which a multi-phase winding consisting of SC windings is wound around a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor; A brushless motor with
The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, and is formed between the magnets and the magnet side. Are formed with a second magnetic pole different from the first magnetic pole,
The rotor core of the continuous rotor is
A shaft-fixing tube portion fixed to the rotating shaft;
A magnet-fixed tube portion including the shaft-fixed tube portion at a constant interval, wherein the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side;
A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval.
Have
In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion,
Each of the bridging portions is connected to the inner peripheral surface of the magnet fixing cylinder portion so that the radial central axis of the bridging portion extending in the radial direction is orthogonal to the circumferential central position of the second magnetic pole. A brushless motor characterized by A continuous rotor in which magnetic poles of 2 × p poles (where p is the number of pole pairs) are alternately arranged in the circumferential direction;
A core having 2 × p × m × n (where m is the number of phases of the stator winding and n is a natural number) teeth and slots facing the rotor provided in a plurality in the radial direction, and the slots A stator having a multi-phase winding wound around
A brushless motor with
The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, and is formed between the magnets and the magnet side. Are formed with a second magnetic pole different from the first magnetic pole,
The rotor core of the continuous rotor is
A shaft-fixing tube portion fixed to the rotating shaft;
A magnet-fixed tube portion including the shaft-fixed tube portion at a constant interval, wherein the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side;
A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval.
Have
In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion,
The inner surface of the magnet fixing cylinder part forming the gap is formed with a groove whose center position is deepest toward the stator side,
The groove has an inner bottom surface formed in an arc shape when viewed from the axial direction, and both side portions of the arc-shaped inner bottom surface are edged in an arc shape and are continuous with the inner surface. Brushless motor. A continuous rotor in which magnetic poles are alternately arranged in the circumferential direction; and a stator in which a multi-phase winding consisting of SC windings is wound around a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor; A brushless motor with
The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, and is formed between the magnets and the magnet side. Are formed with a second magnetic pole different from the first magnetic pole,
The rotor core of the continuous rotor is
A shaft-fixing tube portion fixed to the rotating shaft;
A magnet-fixed tube portion including the shaft-fixed tube portion at a constant interval, wherein the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side;
A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval.
Have
In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion,
The inner surface of the magnet fixing cylinder part forming the gap is formed with a groove whose center position is deepest toward the stator side,
The groove has an inner bottom surface formed in an arc shape when viewed from the axial direction, and both side portions of the arc-shaped inner bottom surface are edged in an arc shape and are continuous with the inner surface. Brushless motor. A continuous rotor in which magnetic poles of 2 × p poles (where p is the number of pole pairs) are alternately arranged in the circumferential direction;
A core having 2 × p × m × n (where m is the number of phases of the stator winding and n is a natural number) teeth and slots facing the rotor provided in a plurality in the radial direction, and the slots A stator having a multi-phase winding wound around
A brushless motor with
The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, and is formed between the magnets and the magnet side. Are formed with a second magnetic pole different from the first magnetic pole,
The rotor core of the continuous rotor is
A shaft-fixing tube portion fixed to the rotating shaft;
A magnet-fixed tube portion including the shaft-fixed tube portion at a constant interval, wherein the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side;
A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval.
Have
In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion,
A brushless motor, wherein a second small magnetic lightweight portion is formed in an axial direction on a side surface of the magnet fixing cylinder portion on an extension line of each bridging portion. A continuous rotor in which magnetic poles are alternately arranged in the circumferential direction; and a stator in which a multi-phase winding consisting of SC windings is wound around a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor; A brushless motor with
The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, and is formed between the magnets and the magnet side. Are formed with a second magnetic pole different from the first magnetic pole,
The rotor core of the continuous rotor is
A shaft-fixing tube portion fixed to the rotating shaft;
A magnet-fixed tube portion including the shaft-fixed tube portion at a constant interval, wherein the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side;
A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval.
Have
In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion,
A brushless motor, wherein a second small magnetic lightweight portion is formed in an axial direction on a side surface of the magnet fixing cylinder portion on an extension line of each bridging portion. The brushless motor according to claim 7 or 8 ,
The brushless motor, wherein the second small magnetic lightweight portion is a second gap penetrating a side surface of the magnet fixing cylinder portion. The brushless motor according to any one of claims 3 to 9 ,
Each of the bridging portions has a length in the axial direction shorter than the length in the axial direction of the shaft fixing cylinder portion and the magnet fixing cylinder portion. A continuous rotor in which magnetic poles of 2 × p poles (where p is the number of pole pairs) are alternately arranged in the circumferential direction;
A core having 2 × p × m × n (where m is the number of phases of the stator winding and n is a natural number) teeth and slots facing the rotor provided in a plurality in the radial direction, and the slots A stator having a multi-phase winding wound around
A brushless motor with
The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, and is formed between the magnets and the magnet side. Are formed with a second magnetic pole different from the first magnetic pole,
The rotor core of the continuous rotor is
A shaft-fixing tube portion fixed to the rotating shaft;
A magnet-fixed tube portion including the shaft-fixed tube portion at a constant interval, wherein the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side;
A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval.
Have
In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion,
The rotor core of the continuous rotor covers at least the magnet with a cover,
The brushless motor is characterized in that the cover is connected and fixed to a second gap formed on a side surface of the magnet fixing cylinder portion. A continuous rotor in which magnetic poles are alternately arranged in the circumferential direction; and a stator in which a multi-phase winding consisting of SC windings is wound around a plurality of slots provided per magnetic pole on the outer periphery of the continuous rotor; A brushless motor with
The rotor core of the continuous rotor includes a plurality of magnets arranged at equal pitches in the circumferential direction so that the first magnetic pole faces the stator side, and is formed between the magnets and the magnet side. Are formed with a second magnetic pole different from the first magnetic pole,
The rotor core of the continuous rotor is
A shaft-fixing tube portion fixed to the rotating shaft;
A magnet-fixed tube portion including the shaft-fixed tube portion at a constant interval, wherein the first magnetic pole and the second magnetic pole are alternately formed at equal pitches in the circumferential direction on the stator side;
A bridging portion that is formed between the shaft fixing tube portion and the magnet fixing tube portion at an equal pitch in the circumferential direction and that connects and holds the shaft fixing tube portion and the magnet fixing tube portion at a constant interval.
Have
In the rotor core, a gap as a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material is formed between the bridge portions connecting the shaft fixing cylinder portion and the magnet fixing cylinder portion,
The rotor core of the continuous rotor covers at least the magnet with a cover,
The brushless motor is characterized in that the cover is connected and fixed to a second gap formed on a side surface of the magnet fixing cylinder portion. The brushless motor according to any one of claims 3 to 12 ,
The rotor core of the continuous rotor has recesses formed on the outer peripheral surface at equal pitches in the circumferential direction, and a magnet is disposed with respect to each recess such that the first magnetic pole faces the stator side, A brushless motor, wherein a second magnetic pole different from the first magnetic pole is formed on a salient pole formed between the concave portion and the concave portion. In the brushless motor according to any one of claims 3 to 1 3,
The rotor core of the continuous rotor is configured by laminating a plurality of rotor core pieces made of steel plates. In the brushless motor according to any one of claims 1 to 1 4,
The brushless motor characterized in that the rotating shaft fixed to the rotor core of the rotor is formed of a non-magnetic material. In the brushless motor according to any one of claims 1 to 15 ,
The stator has two stator cores that have a plurality of teeth that extend in the radial direction and are provided at an equal pitch in the circumferential direction, and two different three-phase windings that are attached to the teeth.
Each of the three-phase windings of the stator is composed of a plurality of conductor portions that penetrate the slots between the teeth in the axial direction and are laminated in the radial direction, and between the conductor portions adjacent in the radial direction for each phase. In FIG. 2, the SC winding is configured to be connected in the circumferential direction by welding at the axially outer end portion on the core side, and the power receiving terminals of each phase are axial lines from the conductor portions at the same radial stack position. Brushless motor characterized by being pulled out in the direction. The brushless motor according to claim 16 , wherein
The stator includes a first conductor portion and a fourth conductor portion, and an outer conductor for wave winding in which the first conductor portion and the fourth conductor portion are connected at a base end portion, a second conductor portion, and a third conductor portion. Having a conductor part, the second conductor part and the third conductor part being connected at a base end part, and having a segment composed of an inner conductor for lap winding enclosed in the outer conductor for wave winding,
The first conductor portion and the second conductor portion, and the third conductor portion and the fourth conductor portion are each set, and each set is inserted into each slot formed in the in-phase stator core adjacent to each other. In each slot, the first conductor portion to the fourth conductor portion are arranged in the order of the first conductor portion, the second conductor portion, the third conductor portion, and the fourth conductor portion from the inside in the radial direction.
The other end adjacent to the tip end of the third conductor portion of one adjacent slot is connected to the tip end portion of the first conductor portion of one adjacent slot and the tip end portion of the second conductor portion of the other adjacent slot. A brushless motor characterized by being a stator in which three-phase Y-connection windings composed of SC windings are wound with a one-slot pitch shift by connecting the tip end portion of the fourth conductor portion of each slot . The brushless motor driving method according to claim 16 or 17 , wherein two different three-phase windings wound around the stator are energized with a phase difference of 30 degrees. Driving method of brushless motor.

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