JP2012235671A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor whose vibration in a radial direction is reduced and whose constitution can be made small.SOLUTION: A rear cover wall 3a of a cylindrical housing 3 includes: a flat section 31; a vibration absorption section 32, a vibration reception section 33 and a bearing storage section 34 from an outer peripheral edge. The bearing storage section 34 is a cylindrical section swollen and formed from an inner peripheral edge on an inner side of the vibration reception section 33 toward a rear side in an axial direction. An outer cylindrical face on the rear side is formed not to protrude to the rear side rather than the outer face on the rear side of the flat section 31. Vibration in a radial direction from a bearing 14 is transmitted to the bearing storage section 34 positioned on a rotor side from the flat section 31 and is transmitted to the vibration absorption section 32 via the vibration reception section 33. The vibration absorption section 32 absorbs the vibration by bending with a base end of the flat section 31 side as a fulcrum and a tip of the bearing reception section 33 side as an action point.

Description

  The present invention relates to a motor.

  Conventionally, in a motor, for example, a brushless motor, a continuous pole type motor in which the magnet attached to the rotor is halved has been proposed (for example, Patent Document 1). The consequent pole type motor is excellent in reducing the cost because the magnet attached to the rotor can be halved.

  Further, various brushless motors have been proposed in which a large number of circumferential slots are formed in the stator per magnetic pole of the rotor, and SC windings are applied to the numerous circumferential slots (for example, Patent Document 2). This motor is known to have a large number of slots per magnetic pole of the rotor, which can reduce cogging torque, improve the occupancy of the windings in the slots, and reduce the physique of the motor per output. Yes.

JP 9-327139 A JP-A-11-98788

  However, the continuous pole type motor has an unbalanced magnetic balance between different magnetic poles (N pole and S pole) that are alternately formed in the circumferential direction of the rotor. There was a problem that the vibration in the direction became large. In particular, in the case of a rotor having an odd number of magnetic pole pairs, radial vibration tends to be particularly large.

  In motors with SC windings, SC windings have U-shaped segments inserted into each slot from the axial direction, and the opposite side is connected by welding or the like in a subsequent process to continuously wind in the circumferential direction. Is a winding that forms Therefore, there has been a problem that a space for the welded portion must be secured outside the stator in the axial direction. As a result, there has been a problem that the total length of the stator in the axial direction is increased, and as a result, the size of the motor is increased.

In view of this, a motor using both a rotor having a continuous pole type rotor and a stator provided with SC winding is conceivable.
In this motor, the cogging torque can be reduced and an inexpensive motor can be provided. However, the radial vibration based on the magnetic imbalance of the consequent pole type rotor and the problem of increasing the size of the motor due to the length of the axial length of the stator based on the stator provided with the SC winding are still solved. Not done.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a motor that can reduce vibration in the radial direction and reduce the size of the motor.

  In order to solve the above-described problem, the invention described in claim 1 is directed to a continuous pole rotor in which magnetic poles of 2 × p poles (where p is a pair of poles) are alternately arranged in the circumferential direction; 2 × p × m × n (where m is the number of phases of the stator windings and n is a natural number) that includes a rotor and is provided in a plurality in number per magnetic pole of the rotor, facing the rotor in the radial direction. A motor comprising a core having teeth and a slot and a stator having a multiphase winding wound around the slot, wherein the rotor and the stator are enclosed in a cylindrical motor case, and the cylindrical motor The wall surface of at least one of the rear side wall surface and the front side wall surface in the axial direction of the case extends from the outer peripheral edge of the wall surface toward the radial inner side to the radial position located inside the radial inner peripheral end of the stator. Flat formed And a bearing housing portion which has an opening portion on the rotor side from the flat portion and which accommodates and fixes a bearing that rotatably supports a rotating shaft fixed to the rotor from the opening portion. And with.

  According to the first aspect of the present invention, since the opening of the bearing housing portion is located on the rotor side from the flat portion, the rotation shaft vibrates in the radial direction, and the vibration causes the bearing and the bearing housing portion to vibrate in the radial direction. However, the bearing housing portion bends and absorbs the vibration to reduce the vibration to the flat portion, the vibration to the outer peripheral surface in the radial direction of the cylindrical motor case is suppressed, and the motor can be rotated gently.

Further, since the bearing housing portion is formed on the rotor side from the flat portion, the axial length can be reduced by that amount, and the overall length of the motor in the axial direction can be shortened.
According to a second aspect of the present invention, in the motor according to the first aspect, the bearing housing portion is configured such that a tip of the opening on the rotor side is positioned between the magnetic pole and the rotating shaft in a radial direction. Is formed.

According to invention of Claim 2, it can suppress that magnetic flux leaks to a rotating shaft.
According to a third aspect of the present invention, in the motor according to the first or second aspect, a detection magnet for detecting the rotation of the rotary shaft is attached to the rear end surface of the rotary shaft.

  According to the third aspect of the invention, by detecting the rotation angle of the detection magnet that rotates integrally with the rotation shaft, the rotation angle, rotation speed, and the like of the rotation shaft can be detected. As a result, the power supply timing can be set for each phase of the winding.

According to a fourth aspect of the present invention, in the motor according to any one of the first to third aspects, the winding wound around the slot is an SC winding.
According to the fourth aspect of the present invention, since the SC winding is used, the occupation ratio of the winding in the slot is improved, and the physique of the motor per output can be reduced.

  According to a fifth aspect of the present invention, in the motor according to any one of the first to fourth aspects, between the flat portion and the bearing housing portion, from the inner peripheral edge of the flat portion toward the rotor side. A cylindrical vibration absorbing portion that is formed to extend, and an annular flat plate-shaped vibration receiving portion that connects a tip circumferential edge of the vibration absorbing portion that extends to the rotor side and an opening on the rotor side of the bearing housing portion. Is provided.

  According to the fifth aspect of the present invention, even if the rotating shaft vibrates in the radial direction and the bearing and the bearing housing portion vibrate in the radial direction due to the vibration, the vibration absorbing portion further absorbs the vibration to the flat portion. Vibration is reduced, vibration to the outer peripheral surface of the cylindrical motor case in the radial direction is suppressed, and the motor can be rotated gently.

  A sixth aspect of the present invention is the motor according to the fifth aspect, wherein the vibration absorbing portion is a conical cylindrical body formed to extend from the inner peripheral edge of the flat portion toward the rotor side. And the outer peripheral end of the said vibration receiving part is connected with the front-end | tip circle periphery extended by reducing the diameter to the rotor side.

According to the sixth aspect of the present invention, since the vibration absorbing portion has a conical cylinder shape, even if the rotation shaft vibrates in the radial direction and the vibration causes the bearing and the bearing housing portion to vibrate in the radial direction, Absorbs vibration.

  According to a seventh aspect of the present invention, in the motor according to any one of the fourth to sixth aspects, the bearing housing portion overlaps with a portion of the SC winding protruding in the axial direction from the stator in the axial direction. In the position.

  According to the seventh aspect of the present invention, the bearing housing portion is provided at a position overlapping in the axial direction with a portion of the SC winding protruding from the stator in the axial direction. Therefore, since the bearing housing portion does not protrude further in the axial direction than the portion protruding in the axial direction from the stator, the overall length of the motor in the axial direction can be shortened.

According to an eighth aspect of the invention, in the motor according to any one of the first to seventh aspects, the number of pole pairs of the continuous pole type rotor is an odd multiple.
According to the eighth aspect of the present invention, even if the pole pair having a large magnetic imbalance and large radial vibration during rotation is an odd-numbered multiple pole type rotor, the large radial vibration is reduced. Can be made.

  According to a ninth aspect of the present invention, in the motor according to any one of the first to eighth aspects, the continuum pole type rotor has a small magnetic lightweight portion having a specific gravity and magnetism smaller than that of the rotor core material.

According to invention of Claim 9, a rotor can be made lightweight and the weight of the whole motor can be reduced.
According to a tenth aspect of the present invention, in the motor according to any one of the first to ninth aspects, a detection magnet for detecting the rotation of the rotary shaft is attached to a rear end surface of the rotary shaft. A cylindrical vibration absorbing portion is formed between the flat portion and the bearing housing portion so as to extend from the inner peripheral edge of the flat portion toward the rotor side, and the detection magnet is provided by the flat portion. It was provided at a position on the front side in the axial direction.

  According to the tenth aspect of the present invention, the detection magnet attached to the rear end surface (tip surface) of the rotating shaft is on the other side of the flat portion that is one end portion in the axial direction of the motor case. Therefore, the total length in the axial direction of the motor can be shortened.

  An eleventh aspect of the present invention is the motor according to the tenth aspect, further comprising a circuit board on which a detection sensor for detecting the detection magnet is disposed, and the circuit board is disposed in contact with the flat portion in the axial direction. Is done.

  According to the eleventh aspect of the present invention, since the circuit board on which the detection sensor for detecting the detection magnet is arranged is disposed in contact with the flat part in the axial direction, the flat part and the circuit board are separated from each other. In comparison, the axial distance can be suppressed, and the total axial length of the motor can be shortened.

  According to a twelfth aspect of the present invention, in the motor according to the tenth or eleventh aspect, a through hole for inserting the rotary shaft is formed in a rear side wall surface in the axial direction of the cylindrical motor case, and the through hole The hole diameter is smaller than that of the detection magnet.

  According to the twelfth aspect of the present invention, the through hole can be made small and close to the rotating shaft, and even if magnetic flux leaks from the magnet constituting the rotor to the rotating shaft, the through hole (motor case) and the stator are Then, the magnetic flux returns to the magnet constituting the rotor. Thereby, the influence on the detection magnet can be reduced.

The invention according to claim 13 uses the motor according to any one of claims 1 to 12 for an electric power steering motor.
According to the thirteenth aspect of the invention, the electric power steering motor can reduce the overall length in the axial direction, and while rotating, the vibration in the radial direction is suppressed, and the electric power steering motor rotates gently.

  ADVANTAGE OF THE INVENTION According to this invention, while reducing radial vibration, the physique of a motor can be made small.

Sectional drawing of the brushless motor of this embodiment. Sectional drawing of the stator of this embodiment. 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. 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 of a consequent pole type | mold. The perspective view for demonstrating a consequent pole type rotor core. The front view seen from the axial direction for demonstrating a stator and a rotor. The partially cutaway sectional view of the brushless motor which shows another example of the present invention. Sectional drawing of the brushless motor which shows another example of this invention. Sectional drawing of the brushless motor which shows another example of this invention.

Hereinafter, an embodiment in which the motor of the present invention is embodied as a brushless motor will be described with reference to FIGS. It explains according to.
As shown in FIG. 1, a motor case 2 of a brushless motor 1 includes a cylindrical housing 3 formed in a bottomed cylindrical shape, and a front end plate 4 that closes an opening on the front side of the cylindrical housing 3. Have. A storage box 5 is attached to the outside of the cylindrical housing 3 on the rear side.

  A stator 6 as an armature is fixed to the inner peripheral surface of the cylindrical housing 3. The stator 6 includes a core 7 as shown in FIG. The 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.

  In the present embodiment, 60 teeth 9 are formed. 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. 3 and 4, each slot S is wound with a three-phase winding composed of a U phase, a V phase, and a W phase. 3 and 4, slot numbers “1” to “60” of the slots S are given in the circumferential direction.

  In each slot S, a segment SG is inserted from one side (rear side) in the axial direction toward the other side (front 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. 5, the segment SG before being inserted into the slot S has an 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.

  Then, the 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”.

  By sequentially inserting the segment SG into the slot S in the same manner, the first and second conductor portions OSi, ISi of the tenth segment SG are connected to the slot number “60”. It is inserted into the slot S and goes around once. 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. An insulator 10 (see FIG. 9) is formed on the inner peripheral surface of the slot S, and the segment SG and the core 7 of the stator 6 are electrically insulated.

  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」、「５
４」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”, “5
It can be seen that the winding is wound in the slot S of “4” (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. 5 is inserted into all 60 slots S under the above conditions. Subsequently, as shown in FIG. 6, 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.

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. It is bent to be twisted and inserted.

  Now, in the slot numbers “60” and “6”, the first segment SG1 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 “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. 9, in the slot S, the first conductor portion OSi, the second conductor portion ISi, the third conductor portion ISo, and the fourth conductor portion OSo are arranged in the order from the inside in the radial direction. (Stacked structure). 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.

  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 U1-phase winding shown in FIGS. 7 and 8 is formed by repeating the same process for the similar 4 to 10 segments SG4 to SG10.

  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. Therefore, the neutral point terminals T0u, T0v, T0w connected to the neutral point N1 (see FIG. 10) and the power receiving terminals T1u, T1v, T1w for receiving power are determined for the windings of each phase.

(Setting of neutral point terminal and power receiving terminal)
As shown in FIGS. 7 and 3, in this embodiment, the outer conductor OS of the first segment SG1 and the connecting conductor portions OSc and ISc of the inner conductor IS are separated from each other in the U1-phase winding.

  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. 3, 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. 3, for the W1 phase winding, the outer conductor OS of the segment SG and the connecting conductor portions OSc, IS of the inner conductor IS inserted in the slot numbers “52” and “58”.
Separate c.

  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, the lead lines L1u, L1v, and L1w drawn from the power receiving terminals T1u, T1v, and T1w of the respective phases are disposed 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. 10 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 each of the corresponding three-phase windings of the first system.

Therefore, as shown in FIGS. 11 and 12, the U2 phase winding of the second system is wound around each slot S with a one-slot pitch shift with respect to the U1 phase winding of the first system.
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. Accordingly, the neutral point terminals T0ua, T0va, T0wa connected to the neutral point N2 (see FIG. 13) and the power receiving terminals T2u, T2v, T2w for receiving power are determined for the windings of each phase.

(Setting of neutral point terminal and power receiving terminal)
As shown in FIG. 3 and FIG. 4, in this embodiment, the neutral point terminal T0ua and the power receiving terminal T2u of 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, as in the U1-phase winding, as shown in FIG. 12, the end connected to the fourth conductor portion OSo of the outer conductor OS and the separation conductor 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 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 FIGS. 3 and 4, for the V2-phase winding, the outer conductor OS of the segment SG inserted in the slot numbers “33” and “39” and the connecting conductor portions OSc and ISc of the inner conductor IS are provided. To separate.

  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 FIGS. 3 and 4, for the W2-phase winding, the outer conductor OS of the segment SG inserted in the slot numbers “29” and “35” and the connecting conductor portions OSc and ISc of the inner conductor IS are provided. To separate.

  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, 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. 13 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 shown in FIG. 1, 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.
(Rotor 11)
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 supported by the rear cover wall 3a 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. 14 and 15, 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. 15, the rotor core 16 is formed in a cylindrical shape and fixed to a shaft 21 that is fixed to the rotary shaft 12, and a magnet fixed that encloses the outer peripheral surface of the shaft-fixed cylinder 21 with a certain interval. It has the bridge part 23 which connects and hold | maintains the cylinder part 22, the axis | shaft fixed cylinder part 21, and the magnet fixed cylinder part 22 with a fixed space | interval.

  On the outer peripheral surface of the magnet fixed cylindrical portion 22, five fan-shaped concave portions 22a are recessed in the axial direction at equal angles in the circumferential direction. 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. 14, magnets MG are fixedly arranged in the five recesses 22a formed 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 surface on the stator 6 side in the radial direction is an S pole.

As a result, the outer surface (stator 6 side) of the salient pole 24 adjacent to the magnet MG in the circumferential direction becomes an N pole that is a magnetic pole different from the outer surface of the magnet MG.
In addition, the number “Z” of the teeth 9 in the stator 6 with respect to the rotor 11 of the present embodiment is set as follows.

That is, if the number of magnets MG of the rotor 11 (= pole number pair) is “p” (where p is an integer of 2 or more) and the number of phases of the SC winding is “m”,
The number of teeth 9 “Z” is configured to be “Z = 2 × p × m × n (pieces)” (where “n” is a natural number).

Incidentally, as shown in FIG. 16, in the present embodiment, the number “Z” of teeth 9 is based on this mathematical formula.
Z = 2 × 5 (number of magnets MG) × 3 (number of phases) × 2 = 60.

  There are five bridging portions 23 for connecting and holding the shaft fixing tube portion 21 and the magnet fixing tube portion 22, and each bridging portion 23 is formed to extend from the outer peripheral surface of the shaft fixing tube portion 21. The inner peripheral surface of the 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.

  Each bridging portion 23 is connected to the inner peripheral surface of the magnet fixing cylinder portion 22 at a position corresponding to the concave portion 22a to which the magnet MG is fitted and fixed. Moreover, each bridging portion 23 is connected such 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 divided into five by the five bridging portions 23 arranged in the circumferential direction, Five gaps 25 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 plates, the rotor core 16 is lightened by forming this air gap 25, and the weight of the entire motor can be reduced.

(Rear cover wall 3a)
A rear-side bearing 14 that rotatably supports the rotary shaft 12 is supported by the rear cover wall 3 a of the cylindrical housing 3. As shown in FIG. 1, the rear cover wall 3 a of the cylindrical housing 3 is formed with a flat portion 31, a vibration absorbing portion 32, a vibration receiving portion 33, and a bearing accommodating portion 34 from the outer peripheral edge thereof.

  The flat portion 31 is an annular flat plate portion having a certain width bent from the outer peripheral edge of the rear cover wall 3a toward the radially inner side, and the inner peripheral end thereof is slightly inside the radial inner peripheral end of the stator 6. It extends to the radial direction position.

  The vibration absorbing portion 32 is a conical tube-shaped tube portion that is formed to extend from the inner inner peripheral edge of the annular flat portion 31 to a predetermined position while being reduced in diameter toward the rotor 11 side. The front-end | tip circle periphery extended by reducing the diameter is extended and formed to the position close | similar to the axial direction rear side surface of the rotor 11. As shown in FIG.

  The vibration receiving portion 33 is an annular flat plate portion having a certain width bent from the inner peripheral edge of the tip of the vibration absorbing portion 32 toward the inside in the radial direction, and the outer periphery of the rear-side bearing 14 attached to the rotary shaft 12. It extends to the radial side that coincides with the position.

  The bearing housing portion 34 is a cylindrical portion that bulges from the inner inner periphery of the vibration receiving portion 33 toward the rear side in the axial direction, and an outer cylindrical surface on the rear side is more than a rear side outer surface of the flat portion 31. Is formed so as not to protrude rearward. That is, the bearing housing portion 34 does not protrude rearward from the central portion of the bowl-shaped recess formed in the rotor 11 side formed by the vibration absorbing portion 32 and the vibration receiving portion 33. A through hole 36 is formed in the bottom surface of the bearing housing portion 34, and the rear end of the rotary shaft 12 projects from the rear cover wall 3 a from the through hole 36.

(Front end plate 4)
The front-side bearing 15 that rotatably supports the rotary shaft 12 is provided on the front end plate 4.
It is supported by. The front end plate 4 is formed with a flat portion 41, a vibration absorbing portion 42, a vibration receiving portion 43, and a bearing housing portion 44 from the outer peripheral edge thereof.

  The flat portion 41 is an annular flat plate portion formed with a certain width and bending from the outer peripheral edge of the front end plate 4 toward the inside in the radial direction, and the inner peripheral end thereof is slightly inward from the radial inner peripheral end of the stator 6. And extending to a radial position.

  The vibration absorbing portion 42 is a conical tube-shaped cylindrical portion that is formed to extend from the inner inner peripheral edge of the annular flat portion 41 to a predetermined position while being reduced in diameter toward the rotor 11 side. The distal end circumferential edge extending in a reduced diameter is formed so as to extend to a position near the side surface on the front side in the axial direction of the rotor 11.

  The vibration receiving portion 43 is an annular flat plate portion having a certain width bent from the inner peripheral edge of the tip of the vibration absorbing portion 42 toward the radially inner side, and the outer periphery of the front-side bearing 15 attached to the rotary shaft 12. It extends to the radial side that coincides with the position.

  The bearing housing portion 44 is a cylindrical portion that bulges from the inner inner peripheral edge of the vibration receiving portion 43 toward the front side in the axial direction, and the outer cylindrical surface on the front side is larger than the front outer side surface of the flat portion 41. Is formed so as not to protrude to the front side. That is, the bearing housing portion 44 does not protrude rearward from the central portion of the bowl-shaped recess formed in the rotor 11 side formed by the vibration absorbing portion 42 and the vibration receiving portion 43. A through hole 46 is formed in the bottom surface of the bearing housing portion 44, and the tip of the rotating shaft 12 projects from the front end plate 4 from the through hole 46.

  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.

  A drive device 50 is housed in a housing box 5 fixed on the rear side outside of the cylindrical housing 3. The circuit board 51 of the driving device 50 includes a rotation sensor 52 for controlling the rotation of the rotor 11, an ECU (electronic control unit) 53, first switching transistors Q1u, Q1v, Q1w, second switching transistors Q2u, Q2v, Q2w, and the like. Various circuit elements are mounted.

  The rotation sensor 52 is mounted on the circuit board 51 so as to face the rotation shaft 12 protruding in the axial direction from the through hole 36 of the bearing housing portion 34 of the rear cover wall 3a. In this embodiment, the rotation sensor 52 is a magnetic sensor such as an MR sensor, and detects the rotation angle of the detection magnet 52a that rotates integrally with the rotation shaft 12 fixed to the shaft end surface of the rotation shaft 12.

  The ECU (electronic control unit) 53 has a microcomputer. Based on the detection signal from the rotation sensor 52, the ECU 53 detects the rotation angle, rotation speed, and the like of the brushless motor 1 at that time. Then, the ECU 53 calculates the power supply timing to each phase of the first system three-phase winding and the second system three-phase winding.

  The first switching transistors Q1u, Q1v, Q1w are, for example, power MOS transistors, and are on / off controlled based on a control signal from the ECU 53. 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 51 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 51 is connected to the first switching transistors Q1u, Q1v, Q1w of the circuit board 51, and is located at a position on the outer peripheral side in the radial direction of the circuit board 51 facing 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, each lead-out line L1u, L1v, L1w drawn from each phase power receiving terminal T1u, T1v, T1w passes through the first insertion hole 37 formed in the flat portion 31 of the rear cover wall 3a, and receives each phase power receiving. Terminals T1u, T1v, T1w and output terminals O1u, O1v, O1w are connected to each phase at 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 53. 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 51 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. And the output which supplies electric power to each phase in the position which is connected with 1st switching transistor Q1u, Q1v, Q1w of the circuit board 51, respectively and is opposite to electric power receiving terminal T2u, T2v, T2w seeing from an axial direction. Terminals O2u, O2v, and O2w are formed, respectively.

  Therefore, each lead-out line L2u, L2v, L2w drawn from the power receiving terminals T2u, T2v, T2w of each phase passes through the second insertion hole 38 formed in the flat portion 31 of the rear cover wall 3a, and receives power of each phase. Terminals T2u, T2v, and T2w and output terminals O2u, O2v, and O2w are connected to the respective phases with the shortest distance in the axial direction.

Next, the operation of the above embodiment will be described below.
During rotation, radial vibration based on the magnetic imbalance of the continuous pole rotor 11 is transmitted to the rear-side bearing 14 and the front-side bearing 15 via the rotating shaft 12. In the present embodiment, since the number of magnetic pole pairs is “5”, which is an odd multiple, a large vibration occurs. The vibrations in the radial direction transmitted to the bearings 14 and 15 are transmitted to the bearing housing portions 34 and 44 located on the rotor 11 side from the flat portion 31, respectively, and the vibration absorbing portions 32 and 42 through the vibration receiving portions 33 and 43. Is transmitted to.

  At this time, the vibration absorbing parts 32 and 42 bend and absorb vibration by using the base end part on the flat part 31 and 41 side as a fulcrum and the tip part on the vibration receiving part 33 and 43 side as an action point. Thereby, vibration in the radial direction of the rotating shaft 12 is not transmitted to the flat portions 31 and 41, and vibration is not transmitted to the outer peripheral surface in the radial direction of the cylindrical housing 3. As a result, the brushless motor 1 has a quiet rotation, and is optimal as a brushless motor 1 used in an electric power steering apparatus that requires a quiet rotation.

  Further, since the bearing housing portions 34 and 44 for supporting the bearings 14 and 15 are formed on the rotor 11 side from the flat portions 31 and 41, the bearing 14 protrudes to the rear side and the bearing 15 to the front side as in the conventional case. Since it does not protrude, the length in the axial direction is reduced accordingly.

  Since the rotor 11 of the brushless motor 1 is a continuous pole type rotor, the magnet MG attached to the rotor 11 is halved. Further, the stator 6 is subjected to SC winding to improve the occupation ratio of the winding in the slot S. Moreover, the number of teeth 9 “Z” is set to be “Z = 2 × p × m × n (pieces) = 60”, and the number of slots S per magnetic pole of the rotor 11 is large so that the cogging torque can be reduced. It is illustrated.

Next, the effect of the said embodiment is described below.
(1) According to the present embodiment, the bearing accommodating portions 34 and 44 that support the bearings 14 and 15 provided on the rear cover wall 3a and the front end plate 4 are not protruded from the flat portions 31 and 41, respectively. Formed.

Therefore, since the bearing 14 does not protrude to the rear side and the bearing 15 does not protrude to the front side, the length in the axial direction can be reduced accordingly.
Further, the bearing housing portions 34 and 44 can be bent with the inner peripheral end portion on the flat portions 31 and 41 side as a fulcrum to absorb the vibration in the radial direction of the rotary shaft 12.

  (2) According to the present embodiment, the vibration absorbing portions 32 and 42 are provided on the rear cover wall 3a and the front end plate 4, respectively. Therefore, the vibration in the radial direction generated in the rotating shaft 12 is more effectively absorbed by the vibration absorbing portions 32 and 42. As a result, the brushless motor 1 with a quiet rotation can be obtained, which is optimal as the brushless motor 1 used in the electric power steering apparatus that requires a quiet rotation.

  In addition, the vibration absorbing portions 32 and 42 are conical cylinders, and the vibration absorbing portions 32 and 42 and the bearing accommodating portions 34 and 44 are separated from each other via the vibration receiving portions 33 and 43 in the radial direction. Configured. Therefore, the vibration absorbing portions 32 and 42 are more easily bent and can absorb the vibration in the radial direction more efficiently.

  (3) According to this embodiment, the air gap 25 is provided in the rotor 11. In other words, the gap 25 has a specific gravity and magnetism smaller than that of a rotor core material made of laminated steel plates, so that the rotor core 16 can be reduced in weight and the entire weight of the brushless motor 1 can be reduced.

(4) According to the present embodiment, the bearing accommodating portions 34 and 44 are provided at positions overlapping in the axial direction with the portions protruding in the axial direction from the stator 6 of each segment SG of the SC winding.
Therefore, since the bearing accommodating portions 34 and 44 do not protrude further in the axial direction than the portion protruding in the axial direction from the stator 6, the total length in the axial direction of the brushless motor can be shortened.

(5) According to the present embodiment, the bearing accommodating portions 34 and 44 are formed so that the tips of the openings on the rotor 11 side are positioned between the magnet MG and the rotating shaft 12 in the radial direction.
Therefore, leakage of magnetic flux to the rotating shaft 12 can be suppressed.

  (6) According to the present embodiment, the detection magnet 52 a that detects the rotation of the rotating shaft 12 is attached to the rear end surface of the rotating shaft 12. Therefore, by detecting the rotation angle of the detection magnet 52a that rotates integrally with the rotation shaft 12, the rotation angle, rotation speed, and the like of the rotation shaft 12 at that time can be detected. As a result, the power supply timing can be set for each phase of the winding.

The above embodiment may be modified as follows.
In the above embodiment, the vibration absorbing portions 32 and 42 have a conical cylinder shape, and the vibration absorbing portions 32 and 42 and the bearing housing portions 34 and 44 are separated in the radial direction. For example, as illustrated in FIG. 17, the vibration absorbing unit 32 and the vibration receiving unit 33 may be omitted. Specifically, in FIG. 17, the rear cover wall 3 a is bent from the inner inner peripheral edge of the annular flat portion 31 to the position where the outer peripheral wall 34 a of the bearing accommodating portion 34 is close to the side surface on the rear side in the axial direction of the rotor 11. Extend and form. And the inner peripheral wall 34b of the bearing accommodating part 34 is formed toward the rear side in the axial direction by bending from the inner peripheral edge of the outer peripheral wall 34a to the rear side.

Then, the bearing 14 is accommodated and fixed to the double-sided bearing accommodating portion 34 composed of the outer peripheral wall 34a and the inner peripheral wall 34b from the rotor side opening.
Even in this case, the bearing housing portion 34 having a double structure can be bent with the connecting portion between the outer peripheral wall 34 a and the flat portion 31 as a fulcrum, and can absorb vibration from the rotating shaft 12.

  The bearing housing portion 34 shown in FIG. 17 has a double structure in which the outer peripheral wall 34a and the inner peripheral wall 34b are in close contact with each other. However, the outer peripheral wall 34a and the inner peripheral wall 34b are vibrated as in the above embodiment. Alternatively, the receiving portion 33 may be interposed and separated.

  In the above embodiment, the vibration absorbing portions 32 and 42 are provided on both the rear cover wall 3a and the front end plate 4, but the vibration absorbing portions 32 and 42 may be provided on either one. For example, the vibration absorbing portion 32 may be provided only on the rear cover wall 3a, or the vibration absorbing portion 42 may be provided only on the front end plate 4.

In the above embodiment, the number of slots S is 60. However, the number of slots S is not limited to this. For example, the number of slots S may be 45, for example.
In the above embodiment, the air gap 25 is formed in the rotor 11, but it may be applied to a rotor that does not form the air gap 25.

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

In the above embodiment, the stator 6 is implemented by the SC winding in which the segment SG is inserted. However, the stator 6 may be applied to a stator formed by winding a winding such as a copper wire.
In the above embodiment, the position of the detection magnet 52a is not particularly mentioned. However, as shown in FIG. 18 and FIG. 19, the detection magnet 52a is positioned more than the flat portion 31 (the bottom surface of the cylindrical housing 3). It is preferable to be provided at a position on the front side of the direction. By adopting such a configuration, the end on the rear side of the rotating shaft 12 does not protrude rearward from the flat portion 31, so that the total length of the motor 1 in the axial direction can be shortened.

  In the above embodiment, although not particularly mentioned, for example, as shown in FIG. 19, it is desirable that the circuit board 51 on which the rotation sensor 52 is disposed is in contact with the flat portion 31 in the axial direction. By setting it as such a structure, compared with the structure (refer FIG. 1) which spaced apart the flat part 31 and the circuit board 51, the full length of the axial direction of the motor 1 can be shortened. Further, even if heat is generated by various circuit elements such as the rotation sensor 52 and the ECU 53 on the circuit board 51, heat can be radiated from the cylindrical housing 3 (motor case 2) by contact with the flat portion 31.

  In the above embodiment, although not particularly mentioned, for example, as shown in FIG. 19, it is desirable that the hole diameter S1 of the through hole 36 is smaller than the diameter S2 of the detection magnet 52a. By adopting such a configuration, the magnetic flux leaked from the magnet MG of the stator 6 to the rotary shaft 12 side through the through hole 36 through the cylindrical housing 3 from the magnet MG of the stator 6 passes through the cylindrical housing 3. Since it returns to MG, it is suppressed that the site | part to which the magnet 52a for a detection was fixed is magnetized. Thereby, it is possible to suppress the distortion of the magnetic field of the detection magnet 52a due to the influence of the magnetized rotating shaft 12.

In the above embodiment, the motor is embodied as the brushless motor 1, but may be embodied as a brushed motor.
In the above embodiment, the continuous pole type rotor 11 is a so-called SPM (Surface Permanent Magnet Motor) type, but this 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 driving motor. Also good.

DESCRIPTION OF SYMBOLS 1 ... Brushless motor (motor), 2 ... Motor case, 3 ... Cylindrical housing, 3a ... Rear cover wall (rear side wall surface), 4 ... Front end plate (front side wall surface), 5 ... Housing box, 6 ... Stator, 7 DESCRIPTION OF SYMBOLS ... Core, 8 ... Cylindrical part, 9 ... Teeth, 10 ... Insulator, 11 ... Rotor, 12 ... Rotary shaft, 14, 15 ... Bearing, 16 ... Rotor core, 21 ... Shaft fixed cylinder part, 22 ... Magnet fixed cylinder part, 22a ... concave portion, 23 ... bridging portion, 24 ... salient pole, 25 ... air gap, 31, 41 ... flat portion, 32, 42 ... vibration absorbing portion, 33, 43 ... vibration receiving portion, 34, 44 ... bearing housing portion, 36 DESCRIPTION OF SYMBOLS ... Through-hole, 37 ... 1st insertion hole, 38 ... 2nd insertion hole, 46 ... Through-hole, 50 ... Drive apparatus, 51 ... Circuit board, 52 ... Rotation sensor, 52a ... Magnet for detection, 53 ... ECU (electronic control) Unit), S ... , S1 ... hole diameter, S2 ... diameter, IS ... inner conductor, MG ... magnet, N1, N2 ... neutral point, OS ... outer conductor, SG ... segment, ISc, OSc ... connecting conductor, ISi ... second conductor Part, ISo ... third conductor part, IWi ... second welding part, IWo ... third welding part, 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 welded part, Owo ... fourth welded part, Q1u, Q1v, Q1w ... first switching transistor, Q2u, Q2v, Q2w ... second switching transistor, SG1-SG10, SG1a-SG10a ... segment, T0u, T0v, T0w, T0ua, T0va, T0wa ... neutral point Child, T1u, T1v, T1w, T2u, T2v, T2w ... power receiving terminal.

Claims (13)

A continuous pole rotor in which magnetic poles of 2 × p poles (where p is the number of pole pairs) are alternately arranged in the circumferential direction;
2 × p × m × n including the rotor and facing each other in the radial direction, provided in plural per magnetic pole of the rotor (where m is the number of stator winding phases and n is a natural number) A stator having a core having teeth and a slot and a multiphase winding wound around the slot, the rotor and the stator being encased in a cylindrical motor case,
The wall surface of at least one of the rear side wall surface or the front side wall surface in the axial direction of the cylindrical motor case is
A flat portion extending from the outer peripheral edge of the wall surface toward the radially inner side toward the radially inner position from the radially inner peripheral end of the stator;
A bearing housing portion which is a central portion of the wall surface and has an opening portion closer to the rotor than the flat portion, and which accommodates and fixes a bearing which rotatably supports a rotating shaft fixed to the rotor from the opening portion. A motor characterized by comprising. The motor according to claim 1,
The motor is characterized in that the bearing housing portion is formed such that a tip of an opening on the rotor side is positioned between the magnetic pole and the rotating shaft in a radial direction. The motor according to claim 1 or 2,
A motor, wherein a detection magnet for detecting rotation of the rotating shaft is attached to a rear end surface of the rotating shaft. The motor according to any one of claims 1 to 3,
The motor, wherein the winding wound around the slot is an SC winding. The motor according to any one of claims 1 to 4,
Between the flat part and the bearing housing part,
A cylindrical vibration absorber formed to extend from the inner periphery of the flat portion toward the rotor;
A motor comprising: an annular flat plate-shaped vibration receiving portion that connects a front end circumferential edge of the vibration absorbing portion extending to the rotor side and an opening on the rotor side of the bearing housing portion. The motor according to claim 5, wherein
The vibration absorbing portion is a conical cylinder-shaped cylinder formed to extend from the inner peripheral edge of the flat portion toward the rotor side, and the vibration is applied to a tip circular peripheral edge extending in a reduced diameter toward the rotor side. A motor characterized in that an outer peripheral end of a receiving portion is connected. The motor according to any one of claims 4 to 6,
The motor is characterized in that the bearing housing portion is provided at a position overlapping with a portion of the SC winding protruding in the axial direction from the stator. The motor according to any one of claims 1 to 7,
A motor characterized in that the number of pole pairs of the continuous pole type rotor is an odd multiple. The motor according to any one of claims 1 to 8,
2. The motor according to claim 1, wherein the continuous pole type rotor is formed with a small magnetic light weight portion having a specific gravity and magnetism smaller than that of the rotor core material. The motor according to any one of claims 1 to 9,
A detection magnet for detecting the rotation of the rotary shaft is attached to the rear end surface of the rotary shaft,
Between the flat portion and the bearing housing portion, a cylindrical vibration absorbing portion is formed extending from the inner periphery of the flat portion toward the rotor side,
The motor according to claim 1, wherein the detection magnet is provided at a position closer to the front side in the axial direction than the flat portion. The motor according to claim 10, wherein
A circuit board on which a detection sensor for detecting the detection magnet is disposed;
The circuit board is disposed in contact with the flat portion in the axial direction. The motor according to claim 10 or 11,
A through hole for inserting the rotary shaft is formed in the axial rear wall surface of the cylindrical motor case,
The motor according to claim 1, wherein a diameter of the through hole is smaller than that of the detection magnet. The motor according to any one of claims 1 to 12,
A motor characterized by being used in an electric power steering motor.

Images