WO2005096470A1 - モータ、送風機、圧縮機及び空気調和機 - Google Patents
モータ、送風機、圧縮機及び空気調和機 Download PDFInfo
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- WO2005096470A1 WO2005096470A1 PCT/JP2005/005710 JP2005005710W WO2005096470A1 WO 2005096470 A1 WO2005096470 A1 WO 2005096470A1 JP 2005005710 W JP2005005710 W JP 2005005710W WO 2005096470 A1 WO2005096470 A1 WO 2005096470A1
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- motor
- yoke plate
- motor according
- armature winding
- armature
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/24—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets axially facing the armatures, e.g. hub-type cycle dynamos
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Definitions
- the present invention relates to a technique relating to a motor including an armature and a field element that are rotatable about a rotation axis.
- An axial gap type brushless DC motor (hereinafter simply referred to as “brushless motor”), for example, is known as a motor including an armature and a field element that are rotatable about a rotation axis.
- the rotor has a field magnet
- the stator has an armature winding and a yoke plate.
- the field magnet and the armature winding are connected to the rotating shaft.
- the structure which opposes in the axial direction along is adopted.
- the field magnet of the rotor for example, a magnet having a flat plate shape and having mutually different polarities in the thickness direction (direction orthogonal to the plane portion) is adopted.
- the field magnet is arranged so that its plane portion is orthogonal to the rotation axis so that the direction of the magnetic flux of the field magnet is along the direction of the rotation axis.
- the armature windings and the yoke plate of the stator are laminated and arranged in this order along the rotation axis of the rotor.
- the yoke plate is formed of a plate made of a magnetic material, and its plane portion is disposed orthogonal to the rotation axis.
- a motor characterized by a flat shape such as an axial gap type brushless motor, is required to be thin in the axial direction.
- the field magnet and the armature winding face each other in the axial direction as described above, the axial thickness of both the field magnet and the armature winding will overlap, so that the motor is made thinner. Becomes difficult.
- Patent Document 1 Japanese Patent Application Laid-Open No. 5-344701
- Patent Document 2 JP-A-59-216458
- Patent Document 3 JP-A-59-516459
- Patent Document 4 JP-A-8-124736
- Patent Document 5 JP-A-6-46554
- Non-Patent Document 1 Takaharu Takeshita, et al., "Sensorless Brushless DC Motor Control Based on Current Estimation Error,” IEICE Transactions D, 1995, Vol. 115, No. 4, p. 420-427
- Non-Patent Document 2 Takaharu Takeshita, et al., "Sensorless salient-pole brushless DC motor control based on speed electromotive force estimation", IEICE Transactions D, 1997, Vol. 117, No. 1, p.98- 104 Disclosure of the Invention
- a first object of the present invention is to provide a technique capable of improving the efficiency and torque of a motor while achieving a reduction in the thickness of the motor.
- a second object of the present invention is to provide a motor that can suppress occurrence of overcurrent.
- a first aspect of the motor according to the present invention is a motor (3) and a field element (2) that are mutually rotatable about a rotation axis (21) along a first direction (L).
- the armature (3) has an armature winding (7) arranged apart from the rotation axis (21) along a second direction (D) perpendicular to the first direction (L).
- Each of the field elements (2) is in the first direction (L).
- a first yoke plate (41), an N pole joined to the other end of one of the adjacent first yoke plates (41), an S pole joined to the other end of the first yoke plate (41), 1 has a U-shaped magnetic path ( ⁇ 1) opened toward the yoke plate (41), and at least partially opposes the armature winding (7) in the second direction (D). And a field magnet (5).
- a second aspect of the motor according to the present invention is the first aspect of the motor, wherein the one ends of the adjacent first yoke plates (41) are mutually connected.
- a third aspect of the motor according to the present invention is the first aspect of the motor, wherein the other ends of the adjacent first yoke plates (41) are connected to the N pole and the S pole. They are connected to each other avoiding boundaries.
- a fourth aspect of the motor according to the present invention is the first aspect of the motor, wherein the first yoke plate (41) has a linear shape parallel to the second direction (D). It has an outer shell (411).
- a fifth aspect of the motor according to the present invention is the first aspect of the motor, wherein the width (461) between adjacent first yoke plates (41) is in the second direction (D )), The wider as the rotation axis (21) force is further away.
- a sixth aspect of the motor according to the present invention is the fifth aspect of the motor, wherein the width (461) between the adjacent first yoke plates (41) is equal to the rotation axis (21). Increases nonlinearly with distance from).
- a seventh aspect of the motor according to the present invention is the first aspect of the motor, wherein the field magnet (5) has a disk shape.
- An eighth aspect of the motor according to the present invention is the first aspect of the motor, wherein the field magnet (5) has an N pole and an S pole in the first direction (L). At least one of the aligned permanent magnets (51) and a second yoke plate (59) for joining the N pole and the S pole on the side opposite to the first yoke plate (41) are included.
- a ninth aspect of the motor according to the present invention is the first aspect of the motor, wherein the field magnet (5) has an N pole and an S pole in the first direction (L). At least two of the aligned hexahedral permanent magnets (53) and the S pole and the N pole of the permanent magnets (53) are connected to the first magnet. And a second yoke plate (59) joined on the opposite side to the work plate (41).
- a tenth aspect of the motor according to the present invention is the eighth aspect of the motor, wherein the permanent magnets (51, 53) are bond magnets.
- An eleventh aspect of the motor according to the present invention is the tenth aspect of the motor, wherein the permanent magnets (51, 53) are formed by injection molding with the first yoke plate (41) and the first magnet. Of two yoke plates (59)
- V formed integrally with the shift.
- a twelfth aspect of the motor according to the present invention is the eighth aspect of the motor, wherein the width of the second yoke plate (59) in the second direction (D) is equal to the width of the permanent magnet ( 51, 53) in the second direction (
- a thirteenth aspect of the motor according to the present invention is the eighth aspect of the motor, wherein the width of the second yoke plate (59) in the first direction (L) is equal to the width of the permanent magnet ( 51, 53) in the first direction (L).
- a fourteenth aspect of the motor according to the present invention is the eighth aspect of the motor, wherein the second yoke plate (59) is configured such that the permanent magnets (51, 53) have different polarities adjacent to each other. In the portion where the movement occurs, the width in the first direction (L) is larger than at other positions.
- a fifteenth aspect of the motor according to the present invention is the first aspect of the motor, wherein the armature (3) includes a substrate (76) on which the armature winding (7) is disposed. ).
- a sixteenth aspect of the motor according to the present invention is the fifteenth aspect of the motor, wherein the motor winding (7) is provided in the first direction (L) of the substrate (76). Are located on opposite sides of each other.
- a seventeenth aspect of the motor according to the present invention is the sixteenth aspect of the motor, wherein the armature winding (7) disposed on one surface of the base (76) includes: The armature winding (7) disposed on the other surface of the substrate (76) is defined by a rotation direction (R) of the field element (2) with respect to the armature (3). Offset from each other.
- An eighteenth aspect of the motor according to the present invention is the fifteenth aspect of the motor, wherein the electric winding (7) is a planar coil in which a conductor is formed by photolithography. .
- a nineteenth aspect of the motor according to the present invention is the first aspect of the motor, wherein a set of one armature (3) and one field element (2) is connected to one motor.
- a motor set and a plurality of said motors The sets were connected along the first direction (L) with the same rotation axis (21).
- a twentieth aspect of the motor according to the present invention is the nineteenth aspect of the motor, wherein the armature windings (7) included in the plurality of motor sets respectively include the plurality of motor sets.
- the motor sets are offset from each other along the rotation direction (R) of the field element (2) with respect to the armature (3).
- a twenty-first aspect of the motor according to the present invention is the first aspect of the motor, wherein the electric winding (7) is provided on the rotating shaft more than the field magnet (5). (21), and the two field elements (2) are arranged in the first direction (L) with the same rotation axis (21), with one armature (3) interposed therebetween.
- the electric winding (7) is provided on the rotating shaft more than the field magnet (5). (21), and the two field elements (2) are arranged in the first direction (L) with the same rotation axis (21), with one armature (3) interposed therebetween.
- a twenty-second aspect of the motor according to the present invention is the first aspect of the motor, wherein the first yoke plate (41) has an air gap (42) between the first yoke plate (41) and the armature winding (7). 74) and a second flat portion (41b) connected to the first flat portion (41a), and the first flat portion (41a) is formed by the first flat portion (41a). It is arranged closer to the armature winding (7) in the first direction (L) than the second plane portion (41b).
- a twenty-third aspect of the motor according to the present invention is the first aspect of the motor, wherein the electric element (3) detects at least a magnetic pole position of the field magnet (5).
- One position detection sensor (6) is further provided, and the position detection sensor (6) is arranged at a substantially central portion of the armature winding (7).
- a twenty-fourth aspect of the motor according to the present invention is the first aspect of the motor, wherein the electric element (3) detects at least a magnetic pole position of the field magnet (5).
- a position detection sensor (6) the position detection sensor (6) being a straight line (d2) connecting the rotating shaft (21) and a substantially central portion of the armature winding (7).
- the field element (2) is arranged in a direction opposite to the rotation direction (R) of the field element (2) with respect to the armature (3).
- a twenty-fifth aspect of the motor according to the present invention is the twenty-third aspect of the motor, wherein a rectangular wave and a sine wave are generated based on the output of the position detection sensor (6). And a driving means (8) for applying any of the driving currents to the armature winding (7).
- a twenty-sixth aspect of the motor according to the present invention is the motor according to the first aspect, further comprising: means for detecting an induced voltage of the electric winding (7); Magnet for magnet (5) Means for estimating the magnetic pole position of the armature winding, and driving means for applying a drive current based on the estimated magnetic pole position of the field magnet (5) to the armature winding (7).
- a twenty-seventh aspect of the motor according to the present invention is the twenty-sixth aspect of the motor, wherein the driving means advances the phase of the drive current relative to the phase of the induced voltage.
- a twenty-eighth aspect of the motor according to the present invention provides an armature (3) having an armature winding (7) and a first yoke plate (31) laminated in one direction (L), A field magnet (5) having magnetic poles arranged in the one direction and having mutually different polarities, the field magnet being rotatable relative to the armature about a rotation axis (21) along the one direction; A child (2).
- the first yoke plate (31) has non-conductive portions (241, 242) extending along the direction of rotation (R).
- a twenty-ninth aspect of the motor according to the present invention is the twenty-eighth aspect of the motor, wherein the non-conductive portions (241, 242) are formed in a circle centered on the rotating shaft (21). It includes a plurality of slits (241) arranged along.
- a thirtieth aspect of the motor according to the present invention is the twenty-ninth aspect of the motor, wherein the plurality of slits (241) are configured such that both the rotation shaft (21) force and the first yoke plate (31 At least one is present before reaching the peripheral edge of ()) irrespective of the angle along the direction of rotation (R).
- a thirty-first aspect of the motor according to the present invention is a twenty-eighth aspect of the motor, wherein
- the one yoke plate (31) is composed of a plurality of magnetic plates (31a, 31b, 31c, 31d) having a boundary along at least one circle centered on the rotation axis (21).
- Body (241, 2 is composed of a plurality of magnetic plates (31a, 31b, 31c, 31d) having a boundary along at least one circle centered on the rotation axis (21).
- a thirty-second aspect of the motor according to the present invention is the motor according to the thirty-first aspect, wherein a boundary (242) between the plurality of magnetic plates is coated with an insulating film.
- a thirty-third aspect of the motor according to the present invention is the twenty-eighth aspect of the motor, wherein the electric winding (7) and the field magnet (5) From (21), the first yoke plate (3
- a thirty-fourth aspect of the motor according to the present invention is the thirty-third aspect of the motor, wherein the field magnets (5) each include magnetic poles arranged in the one direction and having mutually different polarities. Plural The plurality of sub-magnets (52) are alternately different in polarity around the rotation axis (21), and boundaries of different polarities are directed toward the peripheral portion.
- a second yoke plate (4) that includes a second portion (41b) coupled to the opposite side of the armature of the field magnet (5) and that is disposed orthogonal to the rotation axis (21); And a third yoke plate (59) that joins different polarities of the field magnet (5) on the armature side.
- the second yoke plate (4) is connected to the plurality of sub magnets ( At the polar boundary of 52), a non-magnetic portion (46) extending along the direction (D) toward the peripheral portion is provided.
- a first aspect of a blower according to the present invention includes the motor according to any of the first to thirty-fourth aspects, and a fan (91) rotationally driven by the motor.
- a first aspect of a compressor according to the present invention includes the motor according to any one of the first to thirty-fourth aspects, and a compression mechanism (96) rotationally driven by the motor. I have.
- a first aspect of an air conditioner according to the present invention includes the motor according to any of the first to thirty-fourth aspects, and a rotary drive mechanism that is rotationally driven by the motor.
- the armature and the field element rotate relative to each other around the rotation axis by passing a predetermined current through the armature winding.
- an armature as a stator and a field element as a rotor, it can function as a brushless DC motor.
- the field magnet and the armature winding do not face each other in the direction of the rotation axis, but partially face in the second direction perpendicular to the field magnet, the thickness in the direction of the rotation axis can be reduced. As a result, the motor can be made thinner. Further, since the reluctance torque caused by the first yoke plate being attracted by the armature can be used, the torque of the motor can be increased.
- the second aspect of the motor according to the present invention it is possible to improve the strength of the field element and to simplify the manufacturing process while preventing a short circuit of the magnetic flux in the first yoke plate.
- the third aspect of the motor according to the present invention it is possible to improve the strength of the field element and to simplify the manufacturing process while preventing a short circuit of the magnetic flux in the first yoke plate.
- different magnetic poles of the first yoke plate are provided.
- a uniform magnetic resistance can be generated in the second direction across the boundary between the portions that have been magnetized. As a result, a short circuit of the magnetic flux in the first yoke plate can be effectively prevented.
- the width between adjacent first yoke plates increases as the rotation axial force increases, so that the first yoke plate is magnetized during rotation.
- the amount of overlap between the part and the armature winding can be adjusted.
- the cogging torque can be reduced by making the amount of magnetic flux linked to the armature winding into a sine wave shape.
- this effect can be further enhanced.
- the field magnet since the field magnet has a disk shape, the axial surface area of the field magnet can be increased. As a result, the magnetic flux of the field magnet can be used effectively, and the torque and efficiency of the motor can be improved.
- a U-shaped magnetic path that opens toward the first yoke plate can be easily formed, and the magnetic resistance can be reduced.
- the field magnet is composed of a plurality of hexahedron permanent magnets, so that the manufacturing cost of the field magnet can be reduced. .
- a thin field magnet can be formed at low cost, and the manufacturing cost can be reduced.
- the permanent magnet is formed integrally with either the first yoke plate or the second yoke plate by injection molding, so that the production becomes easy and the production cost is reduced. it can.
- the saturation of magnetic flux in the second yoke plate can be prevented, and the torque and efficiency of the motor can be improved.
- the saturation of the magnetic flux in the second yoke plate can be prevented, and the torque and efficiency of the motor can be improved.
- the saturation of the magnetic flux in the second yoke plate can be prevented, and the torque and efficiency of the motor can be improved.
- the armature windings are arranged on the board, the arrangement of the armature windings and the wiring to the armature windings are easy. Manufacturing by this Cost can be reduced.
- a plurality of armature windings can be freely arranged.
- the armature windings on both sides of the board are displaced from each other along the rotation direction of the field element with respect to the armature. This means that the skew is substantially formed with respect to the armature winding. For this reason, torque pulsation can be prevented, and as a result, the efficiency of the motor can be improved and noise can be reduced.
- the armature winding is a planar coil
- the armature winding and the substrate can be integrally formed, and the motor can be made thinner. Become.
- the armature winding is displaced along the rotation direction of the field element between the plurality of motor sets. This means that the skew is substantially formed in the winding. Therefore, torque pulsation can be prevented, and as a result, the efficiency of the motor can be improved and noise can be reduced.
- two field elements can be rotated with respect to one armature, and as a result, the motor can be made thinner and the torque can be increased.
- the air gap can be reduced, the magnetic resistance in the magnetic circuit is reduced, and the efficiency of the motor can be improved.
- the position detection sensor is arranged in a direction opposite to the rotation direction, the phase of the current with respect to the phase of the voltage due to the influence of the inductance of the coil is changed. Can eliminate the delay. Also, the reluctance torque can be used effectively, and the torque and efficiency of the motor can be improved.
- the configuration as the drive means can be simplified.
- noise can be reduced.
- a position detecting sensor such as a Hall element is provided. Since there is no need to provide a motor, it is possible to further reduce the thickness of the motor.
- the phase of the drive current is advanced from the phase of the induced voltage, the delay of the current phase with respect to the voltage phase due to the influence of the coil inductance can be eliminated. . Also, the reluctance torque can be used effectively, and the torque and efficiency of the motor can be improved.
- the field magnet functions as a field, and a predetermined current flows through the armature winding, so that the armature and the field are connected to each other. Rotational movement relative to the magneton becomes possible.
- the motors of the twenty-eighth to thirty-fourth aspects can function as brushless DC motors.
- an induced eddy current is also generated in the first yoke plate along the radial direction or the opposite direction at the peripheral edge of the first yoke plate.
- the non-conductive body of the first yoke plate is orthogonal to the radial direction, the generation of the eddy current can be suppressed, and as a result, the efficiency of the brushless motor is improved.
- the non-conductive portion is a slit, processing is facilitated and manufacturing cost can be suppressed.
- the non-conductor since the non-conductor always exists in the radial direction between the rotating shaft and the peripheral portion of the first yoke plate, the generation of the eddy current occurs. Can be effectively suppressed. Further, the strength against deformation of the first yoke plate when the slit is formed can be maintained.
- the thirty-first aspect of the motor according to the present invention it is possible to form a non-conductive portion having a small radial width.
- the eddy current can be effectively suppressed.
- the direction of the rotating shaft is The thickness of the motor can be reduced, and as a result, the motor can be made thinner.
- reluctance torque caused by the second yoke plate being sucked by the armature winding can be used, so that the motor torque can be increased.
- blower according to the present invention a thin motor with improved torque is provided. Therefore, a small and power-saving blower can be provided.
- a small-sized and power-saving compressor can be provided because it has a thin motor with improved torque.
- a small-sized and power-saving air conditioner can be provided because the air conditioner is provided with a thin and improved torque.
- FIG. 1 is a schematic diagram showing a basic configuration of a drive system.
- FIG. 2 is a perspective view showing an example of a configuration of a brushless motor.
- FIG. 3 is a cross-sectional view illustrating an example of a configuration of a brushless motor.
- FIG. 4 is a perspective view showing an example of a configuration of a field magnet.
- FIG. 5 is a perspective view showing an example of a configuration of a rotor yoke plate.
- FIG. 6 is a diagram showing an example of a configuration of a rotor yoke plate.
- FIG. 7 is a diagram showing a magnetic path on the negative side in the axial direction of the field magnet.
- FIG. 8 is a view showing a magnetic path on the positive side in the axial direction of the field magnet.
- FIG. 9 is a diagram showing an example of a configuration of a rotor yoke plate.
- FIG. 10 is a diagram showing an example of a configuration of a rotor yoke plate.
- FIG. 11 is a diagram showing an example of a configuration of a rotor yoke plate.
- FIG. 12 is a perspective view showing an example of a configuration of a field magnet.
- FIG. 13 is a cross-sectional view illustrating an example of a configuration of a brushless motor.
- FIG. 14 is a cross-sectional view illustrating an example of a configuration of a brushless motor.
- FIG. 15 is a diagram showing an example of a configuration of a short-circuit yoke plate.
- FIG. 16 is a cross-sectional view illustrating an example of a configuration of a brushless motor.
- FIG. 17 is a view showing a state where armature windings are arranged on a surface of a substrate.
- FIG. 18 is a cross-sectional view illustrating an example of a configuration of a brushless motor.
- FIG. 19 is a view showing a state where armature windings are arranged on both sides of a substrate.
- FIG. 20 is a sectional view showing an example of the configuration of a brushless motor.
- FIG. 21 is a cross-sectional view illustrating an example of a configuration of a brushless motor.
- FIG. 22 is a cross-sectional view showing one example of a configuration of a brushless motor.
- FIG. 23 is a sectional view showing an example of the configuration of a brushless motor.
- FIG. 24 is a cross-sectional view showing one example of a configuration of a brushless motor.
- FIG. 25 is a sectional view showing an example of the configuration of a brushless motor.
- FIG. 26 is a diagram illustrating an example of a configuration of a drive circuit.
- FIG. 27 is a diagram illustrating an example of a configuration of a drive circuit.
- FIG. 28 is a diagram showing an example of the arrangement of Hall elements.
- FIG. 29 is a diagram showing an example of the arrangement of Hall elements.
- FIG. 30 is a diagram illustrating an example of a configuration of a drive circuit.
- FIG. 31 is a perspective view showing a configuration of a brushless motor.
- FIG. 32 is a cross-sectional view showing a configuration of a brushless motor.
- FIG. 33 is a view showing an example of a non-conductive portion formed on a stator yoke plate.
- FIG. 34 is a diagram showing an example of a non-conductive portion formed on a stator yoke plate.
- FIG. 35 is a diagram showing an example of a non-conductive portion formed on a stator yoke plate.
- FIG. 36 is a view showing an example of a non-conductive portion formed on a stator yoke plate.
- FIG. 37 is a diagram showing an example of a non-conductive portion formed on a stator yoke plate.
- FIG. 38 is a cross-sectional view showing one example of a configuration of a blower employing a brushless motor.
- FIG. 39 is a cross-sectional view showing one example of a configuration of a scroll compressor employing a brushless motor.
- FIG. 1 is a schematic diagram showing a basic configuration of a drive system 10 according to the first embodiment.
- the drive system 10 includes a brushless motor 1 that is driven to rotate, and a drive circuit 8 that supplies a drive current to the brushless motor 1.
- the drive system 10 will be described in the order of the brushless motor 1 and the drive circuit 8.
- FIG. 2 and 3 are views showing a main configuration of the brushless motor 1
- FIG. 2 is a perspective view
- FIG. 3 is a cross-sectional view as viewed from the III-III position in FIG.
- the brushless motor 1 is configured in a flat shape, and includes a stator 3 and a rotor 2 that are rotatable with respect to each other mainly about a rotation shaft 21.
- a part of the rotor 2 is cut away to make the structure easily visible.
- the direction L along the rotation axis 21 is referred to as “axial direction”, and the side where the rotor 2 is disposed relative to the stator 3 in the axial direction is “positive side”. , And the opposite side is referred to as the “negative side”.
- the direction D perpendicular to the axial direction L and directed from the rotating shaft 21 to the peripheral portion is referred to as a “radial direction”, and the direction R in which the rotor 2 rotates with respect to the stator 3 is referred to as a “rotating direction”.
- FIG. 2 illustrates a case in which the rotational direction R is clockwise with respect to the positive force in the axial direction L.
- the stator 3 includes the armature winding 7 and the stator yoke plate 31 that are stacked on the one jet from the positive side along the axial direction L.
- the stator yoke plate 31 is made of a disk-shaped magnetic material, and a bearing 32 is formed at the center of the disk.
- the rotating shaft 21 is fitted into the bearing 32.
- the rotating shaft 21 is rotatably supported relative to the stator 3, and the plane portion of the stator yoke plate 31 is disposed orthogonal to the axial direction L.
- the armature winding 7 is composed of a plurality of coils 71 arranged around a rotation axis 21 and along a circle away from the rotation axis 21.
- the armature winding 7 is arranged on the positive side in the axial direction L of the stator yoke plate 31 so as to face the rotor 2.
- the rotor 2 includes the reinforcing member 22, the rotor yoke plate 4, and the field magnet 5 in such a manner that the positive side force is also laminated in this order along the axial direction L.
- the disk-shaped rotor yoke plate 4 is fixed to the rotating shaft 21 so that the plane portion is orthogonal to the axial direction L.
- a reinforcing member 22 is provided on the positive side surface of the rotor yoke plate 4, and a field magnet 5 is provided on the negative side surface. Each has been attached.
- the reinforcing member 22 has a disc shape, and is arranged such that the center position of the disc coincides with the center position of the rotating shaft 21.
- the reinforcing member 22 is provided for reinforcing the rotor yoke plate 4, and can be omitted if the rotor yoke plate 4 has sufficient strength.
- the field magnet 5 also has a ring shape (a disk shape having a circular opening at the center), and is arranged such that the center position of the disk coincides with the center position of the rotating shaft 21. ing .
- the distance between the center position of the rotating shaft 21 and the peripheral edge of the field magnet 5 (the outer diameter of the field magnet 5) is smaller than the shortest distance between the center position of the rotating shaft 21 and the armature winding 7. It is small.
- the field magnet 5 is formed so that the armature winding 7 does not face the armature winding 7 in the axial direction L and at least partially faces the armature winding 7 in the radial direction D. It is arranged on the shaft center side (the side of the rotating shaft 21).
- the thickness of the brushless motor 1 in the axial direction L can be reduced, and as a result, the brushless motor 1 can be made thinner. Achieved.
- the field magnet 5 includes a plurality of permanent magnets 51 and a short-circuit yoke plate 59.
- FIG. 4 is a perspective view showing the configuration of the field magnet 5. As shown in FIG. As shown in the figure, the field magnet 5 of the present embodiment includes four permanent magnets 51, and these four permanent magnets 51 are arranged along a circle centered on the rotation shaft 21. The arrangement forms one ring shape.
- Each of the permanent magnets 51 can be divided along the radial direction D into two sub-magnets 52 of the same size.
- Each of the sub-magnets 52 has magnetic poles arranged in the axial direction L and having mutually different polarities.
- the two sub-magnets 52 included in one permanent magnet 51 have different polarities along the axial direction L. That is, as one permanent magnet 51, when viewed from one side in the axial direction, the N pole and the S pole are aligned.
- the plurality of sub-magnets 52 are arranged along one circle centered on the rotation axis 21 to form the ring-shaped field magnet 5.
- the plurality of sub-magnets 52 are arranged such that the magnetic poles thereof are alternately different around the rotation axis 21 and the boundaries of different polarities are along the radial direction D.
- four permanent magnets 51 are used as the field magnets 5.
- At least one permanent magnet 51 (having a polarity along the axial direction L) is used. If there is a pair of sub magnets 52 whose directions are different from each other!
- the short-circuit yoke plate 59 is made of a ring-shaped magnetic material having the same inner diameter and outer diameter as the ring shape formed by the four permanent magnets 51.
- the short-circuit yoke plate 59 is in contact with the entire negative side surface of the four permanent magnets 51 in the axial direction L, and joins the N pole and the S pole of the permanent magnets 51. That is, the short-circuit yoke plate 59 joins one N pole and the other S pole of the adjacent sub magnets 52 on the negative side in the axial direction L, and magnetically short-circuits them.
- the rotor yoke plate 4 arranged on the positive side of the field magnet 5 in the axial direction L is composed of a plurality of magnetic members, and a disk shape is formed by the whole of the plurality of members. It has been.
- 5 and 6 are diagrams showing the configuration of the rotor yoke plate 4, FIG. 5 is a perspective view of the rotor yoke plate 4, and FIG. 6 is a diagram showing a part of the rotor yoke plate 4 when viewed in the positive direction L in the axial direction L. You.
- the rotor yoke plate 4 includes eight slits 46 that extend from the rotation shaft 21 in the radial direction D and serve as non-magnetic members. These slits 46 are formed radially every 45 degrees with respect to the center position of the rotating shaft 21.
- the rotor yoke plate 4 is divided into eight substantially fan-shaped sub-yoke plates 41 by these slits 46.
- Each of the sub yoke plates 41 faces the armature winding 7 in the axial direction L to form the air gap 74, and the first flat portion 41a does not face the armature winding 7 in the axial direction L. It includes a two-plane portion 41b (see FIG. 3). The first plane portion 41a and the second plane portion 41b are arranged so as to extend along the same radial direction D. The ends of the adjacent flat surfaces 41a of the sub yoke plates 41 on the peripheral side (opposite to the rotating shaft 21) are connected to each other by a connecting portion 42 in order to maintain the strength as the rotor yoke plate 4. . Further, as shown in FIG. 6, the width 461 of the slit 46 as the width between the adjacent sub-yoke plates 41 becomes wider as the distance from the rotary shaft 21 increases in the radial direction D.
- each sub-yoke plate 41 is joined to only one sub-magnet 52 (that is, one polarity) at the second plane portion 41b.
- one second planar portion 41b of the adjacent sub-yoke plates 41 is joined to the N pole, and the other second planar portion 41b is joined to the S pole. Further, the eight slits 46 are respectively arranged along the boundary of the polarity of the field magnet 5.
- Such a configuration of the rotor 2 can be manufactured at a relatively low cost by employing a bonded magnet as the permanent magnet 51. That is, a thin permanent magnet can be easily formed by using the permanent magnet 51 as a bond magnet, and the bond magnet as the permanent magnet 51 is integrally formed with one of the rotor yoke plate 4 and the short-circuit yoke plate 59 by injection molding. This will make production easier. As a result, the brushless motor 1 can be manufactured at low cost.
- each coil 71 of the armature winding 7 As a result, a magnetic pole for rotation is generated, and the rotor 2 performs a rotating motion relative to the stator 3.
- FIG. 7 is a perspective view showing a magnetic path on the negative side in the axial direction L of the field magnet 5
- FIG. 8 is a perspective view showing a magnetic path on the positive side in the axial direction L of the field magnet 5. is there.
- the magnetic flux emitted from the N pole of one sub magnet 52 passes through the short-circuit yoke plate 59 Then, it returns to the S pole of the adjacent sub magnet 52.
- the field magnet 5 has a U-shaped magnetic path ⁇ 1 opening toward the sub-yoke plate 41.
- the magnetic flux emitted from the N pole of one sub-magnet 52 first From the second plane portion 41b of one sub-yoke plate 41 joined to 52, it goes to the first plane portion 41a.
- the air gap 74 is passed along the axial direction L to the stator yoke plate 31.
- it after passing through the inside of the stator yoke plate 31, it again crosses the air gap 74 along the axial direction L and heads for the first plane portion 41a of the other sub yoke plate 41 adjacent to the one sub yoke plate 41.
- the second plane The force is applied to the portion 41b, and then returns to the S pole of the other sub-magnet 52 adjacent to the one sub-magnet 52.
- the magnetic flux to the S pole adjacent to one is shown.
- the slit 46 functions to prevent a magnetic flux short circuit between the adjacent sub-yoke plates 41.
- the short circuit of the magnetic flux at the connecting portion 42 is almost negligible because the cross-sectional area of the connecting portion 42 is small and the magnetic resistance is large.
- the field magnet 5 and the armature winding 7 do not face each other in the axial direction L but partially face each other in the radial direction D.
- the thickness in the axial direction L can be reduced. As a result, the motor can be made thinner.
- a U-shaped magnetic path ⁇ 1 opening toward the sub-yoke plate 41 is formed by the arrangement of the short-circuit yoke plate 59.
- the magnetic path on the negative side in the axial direction L of the field magnet 5 can be shortened, so that the magnetic resistance can be reduced.
- the efficiency of the brushless motor 1 can be improved.
- the reluctance torque due to the suction of the sub-yoke plate 41 can be used for rotation, so that the torque of the brushless motor 1 can be increased.
- the field magnet 5 Since the field magnet 5 has a ring shape, the surface area of the field magnet 5 can be increased. As a result, the magnetic flux of the field magnet 5 can be used effectively, and the torque and efficiency of the brushless motor 1 can be improved.
- the structure of the brushless motor 1 according to the first embodiment is not limited to the above-described embodiment (hereinafter, referred to as “representative embodiment”), and various modifications are possible. Hereinafter, various modifications that can be adopted as the structure of the brushless motor 1 of the first embodiment will be described.
- FIG. 9 is a diagram showing an example of the rotor yoke plate 4 in this case.
- a connecting portion 43 is formed on the axial center side of the sub yoke plate 41.
- the ends of the adjacent sub-yoke plates 41 on the axial center side are connected to each other, and a portion on the peripheral side of the slit 46 is opened.
- the connecting portion 43 avoids the boundary between the N pole and the S pole of the permanent magnet 51 so as not to short-circuit the magnetic flux, and is formed further on the axial center side than the permanent magnet 51.
- FIG. 10 is a diagram showing an example of the rotor yoke plate 4 in this case.
- the width 461 of the slit 46 is constant regardless of the radial direction D.
- the outer contour 411 of the sub yoke plate 41 which is a boundary with the slit 46, is parallel to the center line dl along the long axis direction (coincident with the radial direction D) of the slit 46.
- the width 461 of the slit 46 may be non-linearly increased with respect to the distance from the rotation axis 21.
- FIG. 11 is a diagram showing an example of the rotor yoke plate 4 in this case.
- the outer shell 411 of the sub-yoke plate 41 has a curved shape, and the width 461 of the slit 46 increases non-linearly with respect to the distance from the rotary shaft 21.
- the width 461 of the slit 46 becomes wider as the distance from the rotating shaft 21 increases, the sub-yoke plate 41 and the armature winding 7 And the amount of overlap in the axial direction L can be adjusted.
- the amount of magnetic flux interlinking with the armature winding 7 can be made sinusoidal, thereby reducing cogging torque.
- the efficiency of the motor is improved and noise can be reduced.
- this effect can be further enhanced by adopting a structure in which the width 461 of the slit 46 increases nonlinearly.
- the permanent magnet 51 and the sub-magnet 52 employed in the field magnet 5 have a shape that forms a part of a ring shape, but this shape is not particularly limited. Not done.
- hexahedral permanent magnets 53 may be employed as the permanent magnets corresponding to the sub-magnets 52 of the representative form, respectively. By employing the hexahedron permanent magnet 53 in this way, the manufacturing cost of the field magnet 5 can be reduced.
- each of the permanent magnets 53 has magnetic poles arranged in the axial direction L and having mutually different polarities.
- permanent magnets 53 indicating N poles and permanent magnets 53 indicating S poles are alternately arranged. And the S pole is lined up!
- the short-circuit yoke plate 59 joins one N pole and the other S pole of the adjacent permanent magnets 53 on the negative side in the axial direction L, and short-circuits them magnetically. Further, each sub-yoke plate 41 is joined to only one permanent magnet 53.
- a permanent magnet 53 can also be formed of a bonded magnet and formed integrally with either the mouth yoke plate 4 or the short-circuit yoke plate 59 by injection molding.
- the width of the permanent magnet 51 in the radial direction D (the difference between the outer diameter and the inner diameter in the ring shape) and the width of the permanent magnet 51 in the radial direction D are the same.
- the width in the direction D may be larger than the width in the radial direction D of the permanent magnet 51.
- the width of the short-circuit yoke plate 59 in the axial direction L may be larger than the width of the permanent magnet 51 in the axial direction L. According to this, the saturation of the magnetic flux at the short-circuit yoke plate 59 can be prevented, and the magnetic resistance can be reduced. Further, the configuration of FIG. 13 and the configuration of FIG. 14 may be combined.
- FIG. 15 is a diagram showing an example of the short-circuit yoke plate 59 in such a case.
- the portion 59a corresponding to the boundary position between the sub-magnets 52 has a larger width in the axial direction L than the other portions 59b. According to this, the weight of the field magnet 5 is greatly increased! ], The saturation of the magnetic flux at the short-circuit yoke plate 59 can be prevented, and the magnetic resistance can be reduced.
- the armature winding 7 may be arranged on the surface of the substrate 76 as shown in FIGS.
- the substrate 76 has, for example, a ring shape, and the positive direction of the stator yoke plate 31 in the axial direction L is adjusted so that the center position of the disk coincides with the center position of the rotating shaft 21. It is located on the side.
- the armature winding 7 is arranged on the positive side surface of the substrate 76 in the axial direction L. When such a structure is employed, the arrangement of the plurality of coils 71 included in the armature winding 7 and the wiring to the armature winding 7 are easy, so that the manufacturing cost of the brushless motor 1 can be reduced.
- the two substrates 76 on the opposite side in the axial direction L of one substrate 76 are arranged.
- the armature winding 7 may be arranged on the surface.
- the stator 3 shown in the example of FIG. 18 includes a first armature winding 7a, a ring-shaped board 76, a second armature winding 7b, and a stator yoke plate 31 along the axial direction L.
- the positive force is also provided in this order.
- the armature windings 7 of the two layers can be freely arranged.
- the coil 71a forming the first armature winding 7a and the coil 71b forming the second armature winding 7b shown in FIG. (The center positions of each other are in the radial direction D! /, And they are not overlapped! /).
- skew is substantially formed with respect to the armature winding 7 of the stator 3. For this reason, torque pulsation during rotation driving can be prevented, and as a result, the efficiency of the motor can be improved and noise can be reduced.
- the coil 71 of the armature winding 7 having a width in the axial direction L is illustrated.
- a flat printed coil may be employed.
- a conductor is formed on a printed coil by photolithography on the substrate, and the printed coil is formed integrally with the substrate to be planar.
- FIG. 20 is a diagram illustrating an example of the brushless motor 1 in this case.
- the first plane portion 41a and the second plane portion 41b each extend in the radial direction D, but the first plane portion 41a is It is arranged on the negative side (the side of the armature winding 7) in the axial direction L from the two plane portions 41b, and these are connected by a connecting member 41c.
- the air gap 74 formed between the first flat portion 41a and the electric winding 7 can be reduced. Therefore, the magnetic resistance in the magnetic circuit can be reduced, and the efficiency of the motor can be improved.
- the brushless motor 1 includes a plurality of motor sets having the same rotating shaft 21 in the axial direction.
- the structure connected along L may be sufficient.
- FIG. 21 and FIG. 22 are diagrams showing an example of the brushless motor 1 in which two motor sets similar to those shown in FIG. 3 are connected along the axial direction L with the same rotating shaft 21.
- two motor sets in which the arrangement relationship between the rotor 2 and the stator 3 in the axial direction L are opposite to each other are connected.
- the stators 3 of the two motor sets are joined, and in the example of FIG. 22, the rotors 2 of the two motor sets are joined.
- the one that can be shared by one member in both motor sets is shared.
- one stator yoke plate 31 is also used for both motor sets, and in the brushless motor 1 shown in FIG. 22, one rotor yoke plate 4 is used for both motor sets.
- the armature windings 7 included in the plurality of motor sets are arranged along the rotation direction R between the plurality of motor sets. It may be shifted.
- the armature winding 7 of the positive motor set is the first armature winding 7a
- the armature winding 7 of the negative motor set is the second armature winding.
- the coil 71a forming the first armature winding 7a and the coil 71b forming the second armature winding 7b are moved in the rotation direction R as shown in FIG. Along with each other. Even if such a configuration is employed, skew is substantially formed with respect to the armature winding 7 of the stator 3, so that torque pulsation can be prevented. As a result, the efficiency of the motor is improved and Noise can be reduced.
- the field magnet 5 is arranged on the axial center side of the armature winding 7 as shown in FIG. 3 and the like. However, as shown in FIG. It may be arranged on the peripheral side of the child winding 7. Also in this case, by arranging the field magnet 5 and the armature winding 7 at least partially facing each other in the radial direction D, the thickness in the axial direction L can be reduced, and the motor can be made thinner. It becomes.
- FIG. 24 shows a brushless motor 1 having a structure in which two of the motor sets shown in FIG. 23 are connected by joining the stators 3 together.
- one stator yoke plate 31 is also used for both motor sets.
- FIG. 25 is a diagram showing the brushless motor 1 in such a case.
- the stator 3 of the brushless motor 1 does not include the force stator yoke plate 31 including the armature winding 7 and the bearing 32.
- the two rotors 2 are connected along the axial direction L with the same rotating shaft 21 with the one stator 3 interposed therebetween.
- the short-circuit yoke plate 59 causes the N pole and the S pole to be Are short-circuited to form a magnetic path via the short-circuit yoke plate 59.
- a magnetic path is formed between the two rotors 2 on the side of the field magnet 5 where the short circuit board 59 is not disposed. That is, the magnetic flux emitted from the N pole of the field magnet 5 of one rotor 2 first passes through the sub-yoke plate 41 of the same rotor 2, and then the portion where the armature winding 7 of the stator 3 is disposed.
- the drive circuit 8 will be described (see FIG. 1).
- three examples are shown as the drive circuit 8, but any of them may be employed.
- FIG. 26 is a diagram illustrating an example of the configuration of the drive circuit 8.
- the drive circuit 8 includes a main circuit 811, a pre-driver 812, a three-phase distributor 813, and a PWM generator 814, and supplies a rectangular wave drive current to the armature winding 7 of the brushless motor 1. It is configured as follows.
- the armature winding 7 of the brushless motor 1 is arranged in three phases, and in each phase, the position of the magnetic pole of the field magnet 5 is detected, and the phase of the electrical angle is 120 degrees with respect to each other.
- Three different signals HU, HV, HW are output and input to the three-phase distributor 813.
- a triangular wave or a sawtooth wave as a carrier component is generated from the PWM generator 814 and input to the three-phase distributor 813.
- a three-phase fundamental wave is generated based on these signals and the speed command, and input to the main circuit 811 via the pre-driver 812.
- a drive current of a rectangular wave is supplied from the main circuit 811 to the brushless motor 1. If the driving circuit 8 supplies such a rectangular wave driving current to the brushless motor 1, the configuration can be simplified.
- FIG. 27 is a diagram illustrating an example of the configuration of the drive circuit 8.
- the drive circuit 8 includes a main circuit 821, a pre-driver 822, a waveform generator 823, a PWM generator 824, a position estimation counter 825 and a position offset counter 826, and the armature winding of the brushless motor 1. 7 is configured to give a sine-wave drive current.
- the armature windings 7 of the brushless motor 1 are arranged in three phases, the magnetic pole positions of the field magnets 5 in each phase are detected, and the phase of the electrical angle is 120 degrees with respect to each other.
- Three different signals HU, HV, HW are output and input to the position estimation counter 825
- the position estimation counter 825 converts the three signals HU, HV, and HW into timing signals each having an electrical angle of 60 degrees.
- the magnetic pole position of the field magnet 5 is estimated by counting the electrical angle of 60 degrees, and a sine wave reference signal corresponding to the estimated magnetic pole position is generated.
- the phase of the reference signal is corrected based on the signal from the position offset counter 826 to which the phase command is input.
- a three-phase fundamental wave is generated based on the reference signal from the position estimation counter 825, the triangular wave or sawtooth wave of the PWM generator 824 power, and the speed command. Input to the main circuit 821 via As a result, a sine-wave drive current is supplied from the main circuit 821 to the brushless motor 1. If the drive circuit 8 supplies such a sine wave drive current to the brushless motor 1, the brushless motor 1 can be driven with low noise.
- the Hall element 6 as a position detection sensor is arranged in the brushless motor 1 for each phase. Then, the above-described signals HU, HV, HW are output from the Hall element 6 for each phase.
- the Hall element 6 has a force disposed substantially at the center of the coil 71 of the armature winding 7, and as shown in FIG. It may be arranged so as to be shifted in the direction opposite to the rotation direction R with respect to the straight line d2 along the radial direction D to be connected.
- the phase of a current is generally delayed from the phase of a voltage due to the influence of the inductance of a coil.
- the Hall element 6 in a direction opposite to the rotation direction R as shown in FIG. 29, such a phase delay of the current can be eliminated.
- the reluctance torque can be used effectively, and the torque and efficiency of the motor can be improved.
- FIG. 30 is a diagram illustrating an example of the configuration of the drive circuit 8.
- the drive circuit 8 shown in the figure is configured to detect an induced voltage of the armature winding 7 and estimate the magnetic pole position of the field magnet 5 from the detected induced voltage.
- the drive circuit 8 supplies a drive current to the armature winding 7 of the brushless motor 1 based on the estimated magnetic pole position of the field magnet 5. Therefore, the drive circuit 8 can perform sensorless drive for driving the brushless motor 1 without using a position detection sensor such as the Hall element 6.
- the principle of such sensorless driving is disclosed, for example, in Non-Patent Documents 1 and 2. It is.
- the drive circuit 8 that performs sensorless drive it is not necessary to provide a position detection sensor such as a Hall element, so that the motor can be further thinned.
- phase of the drive current supplied to the brushless motor 1 be advanced from the phase of the detected induced voltage. Even in this case, the delay of the phase of the current with respect to the voltage due to the influence of the inductance of the coil can be eliminated. Also, the reluctance torque can be used effectively, and the torque and efficiency of the motor can be improved.
- FIG. 31 and 32 are diagrams showing a main configuration of the motor according to the second embodiment.
- FIG. 31 is a perspective view
- FIG. 32 is a cross-sectional view as viewed from the II-II position in FIG.
- the motor according to the present embodiment is configured as an axial gap type brushless motor 201.
- the brushless motor 201 mainly includes a stator 3 and a rotor 2 that is rotatable relative to the stator 3 about a rotating shaft 21.
- a part of the rotor 2 is cut away to facilitate visual recognition of the structure.
- the rotor 2 includes a reinforcing member 22, a rotor yoke plate 4, and a field magnet 5 that are stacked in this order in the positive direction along the axial direction L.
- the rotor yoke plate 4 is made of a disk-shaped magnetic material, and the center position of the disk is fixed to the rotation shaft 21 so that the plane portion is orthogonal to the axial direction.
- the reinforcing member 22 has a disk shape having a diameter larger than that of the rotor yoke plate 4, and is attached to the plane portion of the rotor yoke plate 4 so that the center position of the disk matches the center position of the rotating shaft 21. ing.
- the field magnet 5 has a ring shape (a disk shape having a circular opening at the center) with a smaller diameter than the rotor yoke plate 4.
- the field magnet 5 is also attached to the plane portion of the rotor yoke plate 4 such that the center of the disk coincides with the center of the rotating shaft 21. For this reason, the plane portion of the field magnet 5 is also arranged orthogonal to the axial direction L.
- the field magnet 5 has magnetic poles arranged in the thickness direction along the axial direction L and having mutually different polarities. Therefore, the direct magnetic flux of the field magnet 5 (exiting from the field magnet 5 or , The magnetic flux entering the field magnet 5) is along the axial direction L.
- the number of magnetic poles on one surface of the field magnet 5 is not particularly limited.
- the stator 3 includes the armature winding 7 and the stator yoke plate 31 which are stacked in the single jet from the positive side along the axial direction L.
- the stator yoke plate 31 is made of a disk-shaped magnetic material, and a bearing 32 is formed at the center of the disk.
- the rotating shaft 21 is rotatably supported relative to the stator yoke plate 31 by being fitted into the bearing 32.
- the plane portion of the stator yoke plate 31 is orthogonal to the axial direction L. Therefore, the direct magnetic flux of the field magnet 5 is orthogonal to the plane portion of the stator yoke plate 31.
- the armature winding 7 is composed of a plurality of coils 33 arranged along one circle centered on the rotating shaft 21. As shown in FIG. 32, the armature winding 7 is fixed to the positive side surface of the stator yoke plate 31 in the axial direction L so as to face the field magnet 5 along the axial direction L.
- FIG. 33 is a view showing a part of the stator yoke plate 31 in which the positive side force in the axial direction L is also viewed.
- the armature winding 7 fixed to the stator yoke plate 31 is indicated by a broken line
- the field magnet 5 is indicated by a dashed line against the armature winding 7. (The same applies to FIGS. 34 to 37 described later.)
- the stator yoke plate 31 is formed with a plurality of slits 241 that are elongated air layers extending in the rotation direction R in three layers in the radial direction D.
- Each layer includes a plurality of slits 241.
- a plurality of slits 241 are arranged on each of three circles having different diameters around the rotation axis 21. The diameters of these three circles are set so as to overlap the rotation path of the field magnet 5 in the axial direction L of the position force of the slit 241. That is, the plurality of slits 241 are formed so as to extend in a direction perpendicular to the radial direction D at a position where the direct magnetic flux of the field magnet 5 passes when the rotor 2 performs the rotational motion.
- the brushless motor 201 having such a configuration, when a predetermined current is applied to the armature winding 7, the field magnet functions as a field, and the rotor 2 moves relative to the stator 3. Perform rotational movement. In this rotational movement, the magnetic flux of the field magnet 5 of the rotor 2 The rotor yoke plate 31 moves in the rotational direction R while being orthogonal to the plane portion. Therefore, on the stator yoke plate 31, at the position overlapping the rotation path of the field magnet 5 in the axial direction L, the induced vortex along the radial direction D or the opposite direction according to Fleming's right hand rule. An electric current is about to occur.
- a slit 241 is formed in the stator yoke plate 31 as a non-conductive portion extending along the rotation direction R. That is, since the non-conductive slit 241 is formed perpendicular to the direction in which the eddy current is to be generated, the generation of the eddy current can be effectively suppressed. Therefore, iron loss is reduced and the efficiency of the brushless motor 201 can be improved. Further, since the plurality of slits 241 are formed at positions overlapping the rotation path of the field magnet 5 in the axial direction L, generation of eddy current can be suppressed more effectively.
- the slit 241 serving as an elongated air layer is employed, so that the processing for forming the non-conductive portion is easy, and The manufacturing cost of the Sumota 201 can be reduced.
- the shape and arrangement of the non-conductive portion formed on the stator yoke plate 31 are not limited to those shown in FIG. 33, and various modifications are possible. Hereinafter, various modifications of the non-conductive portion that can be employed in the brushless motor 201 of the second embodiment will be described.
- FIG. 34 is a view showing another example of the non-conductive portion formed on the stator yoke plate 31. As shown in FIG. In this example, a plurality of slits 241 are provided so that at least one slit 241 exists from the rotation shaft 21 to the periphery of the stator yoke plate 31 regardless of the angle along the rotation direction R. Is formed.
- a plurality of slits 241 are formed in the stator yoke plate 31 along the rotation direction R in three layers in the radial direction D. Focusing on only one of the layers, a slit 241 is formed in the path along the radial direction D from the rotating shaft 21 to the periphery of the stator yoke plate 31 depending on the angle along the rotating direction R. There is a portion 45 that is not filled (the portion between adjacent slits 241). That is, the portion where the non-conductive portion is not disposed ( Hereinafter, it is referred to as a “conductor portion”. There are 45).
- the conductor portion 45 when there is the conductor portion 45 for one layer in the path along the radial direction D, it is necessary that at least one slit 241 of another layer always exists on the same path. It has become.
- the three layers in which the slit 241 is formed are also referred to as the first layer, the second layer, and the third layer with respect to the inner force, focusing on the path dl shown in FIG. 34, the first layer and the third layer are There is a slit 241 in the second layer where the conductor portion 45 has a certain force. Also, paying attention to the route d2 shown in FIG. 34, the conductor portion 45 is provided in the second layer, but the slit 241 is provided in the first layer and the third layer.
- FIG. 35 is a view showing another example of the non-conductive portion formed on the stator yoke plate 31.
- the stator yoke plate 31 is composed of a plurality of magnetic plates 31a to 31d having boundaries along a circle centered on the rotation shaft 21. Then, the boundary 242 between the plurality of magnetic plates is a non-conductive portion.
- the stator yoke plate 31 in this example is configured by combining three ring-shaped magnetic plates 31a, 31b, 31c and a disk-shaped magnetic plate 31d.
- the outer diameter of 3 lb of the magnetic plate with respect to the inner diameter of the magnetic plate 31a, the outer diameter of the magnetic plate 31c with respect to the inner diameter of 3 lb of the magnetic plate, and the 3d of the magnetic plate 3d with respect to the inner diameter of the magnetic plate 31c The outer diameters are slightly smaller.
- stator yoke plate 31 is formed with the non-conductive portion extending along the rotation direction R, generation of eddy current can be suppressed. Since the non-conductive portion is a boundary 242 between the plurality of magnetic plates 31a to 31d having a boundary along a circle around the rotation axis 21, the non-conductive portion has a radial direction D. Can be made very small. Therefore, since the magnetic resistance of the stator yoke plate 31 during the rotation of the brushless motor 201 can be reduced, the magnetic saturation is improved and the efficiency of the brushless motor 201 can be further improved.
- a minute non-conductive portion can be easily formed. Furthermore, in this example, since the insulating film is coated on the boundary 242 between the magnetic plates, current leakage at the boundary 242 is prevented, and the generation of eddy current can be effectively suppressed.
- FIG. 36 is a view showing another example of the non-conductive portion formed on the stator yoke plate 31. As shown in FIG. The configuration of the stator yoke plate 31 of this example is a combination of the configurations shown in FIGS. 33 and 35.
- the stator yoke plate 31 of the present example is formed by combining three ring-shaped magnetic plates 31a, 31b, 31c and a disk-shaped magnetic plate 31d as shown in the example of FIG. It is configured . Further, a plurality of slits 241 extending along the rotation direction R are formed in three layers in the radial direction D as in the example of FIG. In addition, the diameters of the three layers where the plurality of slits 241 are arranged are equal to the diameters of the three boundaries 242 between the magnetic plates.
- both the plurality of slits 241 and the boundary 242 between the magnetic plates are non-conductive portions extending along the rotation direction R. Further, since the diameter of the layer in which the plurality of slits 241 are arranged matches the diameter of the boundary 242 between the magnetic plates, as shown in FIG. In the portion 45, a boundary 242 between the magnetic plates is always arranged. Therefore, generation of eddy current can be effectively suppressed.
- One slit 241 may always exist in the radial direction D regardless of the angle along the slit. According to this, generation of the eddy current can be more effectively suppressed.
- the armature winding 7 and the field magnet 5 have been described as opposing each other along the axial direction L. However, as in the first embodiment, they are arranged along the radial direction D. They may be arranged one above the other. Even in the same brushless motor as in the first embodiment, since the magnetic flux moves in the stator plate 31 while crossing at right angles, an induced eddy current tends to be generated in the radial direction D or in the opposite direction. Therefore, in order to prevent this, a non-conductive portion may be formed on the stator yoke plate 31 in the same manner as in the second embodiment. Any of the shapes and arrangements of the non-conductive portion shown in FIGS. 33 to 37 can be adopted.
- the slits 241 are formed in three layers in the radial direction D. You may. However, when one slit 241 always exists in the radial direction D regardless of the angle along the rotation direction R as shown in FIG. 34, a plurality of layers are required.
- the boundary 242 between the plurality of magnetic plates needs to have at least one force that has existed in the radial direction D.
- the non-conductive portion has a curved shape extending along the rotation direction R.
- the force along the rotation direction R is such that at least a part thereof is orthogonal to the radial direction D. If it extends, it may be straight!
- the brushless motors 1, 201 are thin and have a high torque. It can be suitably used for a harmony machine.
- an air conditioner using the brushless motor 1 of the first embodiment will be described.
- FIG. 38 is a cross-sectional view showing an example of the configuration of a blower employing the brushless motor 1.
- This blower 101 is configured as a centrifugal blower used for an indoor unit of an air conditioner.
- a fan 91 as a rotary drive mechanism for forming an air flow path.
- the fan 91 is composed of a hub 92, a plurality of blades 94 arranged at regular intervals in the circumferential direction at the periphery of the hub 92, and a shroud 93 covering the hub 92 and the blades 94.
- the center side of the shroud 93 is the suction port 91a of the blower 101, and the outside of the blade 94 is the outlet 91b of the blower 101. That is, by the rotation of the fan 91, air is sucked in from the suction port 91a, and air is blown out from the air outlet 91b.
- the brushless motor 1 is employed as a rotation driving unit of the fan 91.
- the rotation center of the fan 91 is fixed to the rotation shaft 21 of the brushless motor 1.
- a small and power-saving blower can be provided.
- the structure of the brushless motor 1 may be any of those described in the first embodiment.
- the brushless motor 201 of the second embodiment may be used instead of the brushless motor 1. In this case, any of those described in the second embodiment may be adopted. Thereby, a blower with low power consumption can be provided.
- FIG. 39 is a cross-sectional view showing an example of a configuration of a scroll compressor employing the brushless motor 1.
- the scroll compressor 102 is configured as a compressor for a refrigerant gas of an air conditioner, and includes a fixed scroll 95 and an orbiting scroll 96 as a rotary drive mechanism.
- the fixed scroll 95 and the orbiting scroll 96 each have a wrap, and these wraps are arranged so as to be joined to each other.
- the orbiting scroll 96 is driven to rotate, the refrigerant gas entering the compression chamber 97 formed between the wraps is compressed.
- the brushless motor 1 is employed as a rotation driving means of the orbiting scroll 96.
- the orbiting scroll 96 is fixed eccentrically with respect to the axis of the rotating shaft 21 of the brushless motor 1.
- the structure of the brushless motor 1 is the same as that described in the first embodiment. Any of them may be used.
- the compressor may have a compression mechanism other than the scroll type compressor of this embodiment.
- the brushless motor 201 of the second embodiment can be used instead of the brushless motor 1. In this case, any of those described in the second embodiment may be adopted.
- a compressor with low power consumption can be provided.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/594,543 US7608964B2 (en) | 2004-03-31 | 2005-03-28 | Motor, blower, compressor, and air conditioner |
EP05727169A EP1732191A4 (en) | 2004-03-31 | 2005-03-28 | ENGINE, FAN, COMPRESSOR AND AIR CONDITIONER |
CN2005800102536A CN1938922B (zh) | 2004-03-31 | 2005-03-28 | 电机、鼓风机、压缩机和空调机 |
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JP2004104540 | 2004-03-31 | ||
JP2004-104540 | 2004-03-31 | ||
JP2004104539 | 2004-03-31 | ||
JP2004-104539 | 2004-03-31 |
Publications (1)
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WO2005096470A1 true WO2005096470A1 (ja) | 2005-10-13 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/005710 WO2005096470A1 (ja) | 2004-03-31 | 2005-03-28 | モータ、送風機、圧縮機及び空気調和機 |
Country Status (4)
Country | Link |
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US (1) | US7608964B2 (ja) |
EP (1) | EP1732191A4 (ja) |
CN (1) | CN1938922B (ja) |
WO (1) | WO2005096470A1 (ja) |
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JP7303479B1 (ja) | 2022-03-22 | 2023-07-05 | ダイキン工業株式会社 | 送風装置および空気調和機 |
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Also Published As
Publication number | Publication date |
---|---|
EP1732191A1 (en) | 2006-12-13 |
CN1938922B (zh) | 2010-12-01 |
US7608964B2 (en) | 2009-10-27 |
EP1732191A4 (en) | 2010-10-27 |
US20070200445A1 (en) | 2007-08-30 |
CN1938922A (zh) | 2007-03-28 |
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