JP2014165973A - Stator and motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator which can reduce an external arrangement space, and also can shorten wiring.SOLUTION: A stator 13 comprises: a first stator core 14 which has a first core base part 18 and first claw-like magnetic poles 21 extending in an axial direction from an inside end in a radial direction of the first core base part 18; a second stator core 15 which has a second core base part 22 and second claw-like magnetic poles 24 extending in the axial direction from an inside end in a radial direction of the second core base part 22; and a coil part 16 which is arranged between the first core base part 18 and the second core base part 22 in the axial direction, and makes the first claw-like magnetic poles 21 and the second claw-like magnetic poles 24 function as mutually different magnetic poles by energization. The first and second claw-like magnetic poles 21 and 24 are provided in equally spaced intervals in a circumferential direction except at a missing part 20 that is a part of the equally spaced interval position in the circumferential direction, and a drive unit 31 formed of a drive circuit which controls the energization to the coil part 16 and is embedded in a resin member 33 is provided at a circumferential position of the missing part 20.

Description

  The present invention relates to a stator and a motor.

  The stator of the motor includes a first stator core portion having a first claw-shaped magnetic pole extending in the axial direction from the radial end portion of the first core base portion, and a first stator core extending in the axial direction from the radial end portion of the second core base portion. Some include a second stator core portion having two claw-shaped magnetic poles and a coil portion disposed between the first core base portion and the second core base portion in the axial direction (see, for example, Patent Document 1). .

  In this stator, a set of first and second stator core portions and coil portions is provided for each phase of the U phase, V phase, and W phase, and when each coil portion is energized, the first claw-shaped magnetic pole and the second claw The magnetic poles function as magnetic poles different from each other, and the rotor that is opposed in the radial direction is rotationally driven.

JP 2007-181303 A

  However, in the stator as described above, a drive circuit for controlling energization to the coil portion is required outside the stator, and a space for arranging the drive circuit is required outside, and from the coil portion to the external drive circuit. There is a problem that the wiring becomes necessary. The wiring from the coil portion to the drive circuit outside the stator increases the material and causes the resistance to the coil portion to increase.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a stator and a motor that can reduce the external arrangement space and shorten the wiring. It is in.

  A stator that solves the above problems includes a first core base portion provided on one side in the axial direction and a plurality of first claw-like shapes extending in a circumferential direction extending from a radial end portion of the first core base portion to the other side in the axial direction. A first stator core portion having a magnetic pole, a second core base portion provided on the other side in the axial direction, and a plurality of second cores extending in the circumferential direction extending from the radial end of the second core base portion to one side in the axial direction. A second claw-shaped magnetic pole, and the second claw-shaped magnetic pole is disposed adjacent to the first claw-shaped magnetic pole in the circumferential direction while the second core base portion is opposed to the first core base portion. The first claw-shaped magnetic pole and the second claw-shaped magnetic pole are arranged as magnetic poles different from each other based on energization, arranged between the stator core portion, the first core base portion, and the second core base portion in the axial direction. A stator having a functioning coil portion, wherein the first and Two claw-shaped magnetic poles are provided at equal intervals in the circumferential direction except for some missing portions at circumferentially equidistant positions. The circumferential positions of the missing portions are for controlling energization to the coil portion. A drive circuit is provided.

  According to this configuration, the first and second claw-shaped magnetic poles are provided at equal intervals in the circumferential direction except for some missing portions at circumferentially equidistant positions, and the coil portions are disposed at circumferential positions of the missing portions. Since a drive circuit for controlling energization of the drive circuit is provided, the drive circuit becomes unnecessary outside. Therefore, an external arrangement space can be reduced, and the wiring connecting the coil unit and the drive circuit can be shortened.

In the stator, it is preferable that a rotation sensor for detecting rotation of the rotor is provided at a circumferential position of the missing portion.
According to this configuration, since the rotation sensor for detecting the rotation of the rotor is provided at the circumferential position of the missing part, no rotation sensor is required outside. Therefore, the external arrangement space can be further reduced, and the wiring connecting the drive circuit and the rotation sensor can be shortened.

In the stator, it is preferable that a set of the first and second stator core portions and the coil portion is provided for each phase, and the drive circuit is provided for each phase.
According to this configuration, the set of the first and second stator core portions and the coil portions is provided for each phase, and a drive circuit is provided for each phase. For example, if necessary, independent driving for each phase can be performed. It becomes possible.

In the stator, it is preferable that the drive circuits are electrically connected.
According to this configuration, since the drive circuits provided for each phase are electrically connected to each other, for example, the energization to the coil unit for each phase can be controlled in a linked manner.

In the stator, it is preferable that the drive circuit has a drive unit embedded in a resin member, and the drive unit is provided at a circumferential position of the missing portion.
According to this configuration, the drive circuit includes the drive unit embedded in the resin member, and the drive unit is provided at the circumferential position of the missing portion, so that, for example, handling and assembly thereof are facilitated.

In the stator, it is preferable that the resin member of the drive unit is formed with a hole through which a part of the coil portion in the circumferential direction is formed by winding a conductor around a plurality of turns.
According to this configuration, the resin member of the drive unit is formed with a hole through which a part of the coil portion in the circumferential direction is formed by winding a plurality of conductors. It can arrange | position, keeping a part of direction.

  In the stator, it is preferable that both ends of the coil portion are electrically connected to the drive circuit every one turn, and the drive circuit can control energization for each turn of the coil portion.

  According to the same configuration, both ends of the coil unit are electrically connected to the drive circuit every round, and the drive circuit can control the energization for each round of the coil unit. Depending on the condition, some of the coil portions can be energized.

The motor which solves the said subject is provided with the said stator.
According to this configuration, the above-described effect can be obtained in the motor.

  In the stator and the motor of the present invention, the external arrangement space can be reduced and the wiring can be shortened.

The perspective view of the brushless motor in one Embodiment. The partial cross section perspective view of the stator in the form. The schematic side view for demonstrating the drive unit in the form. The partial cross section perspective view of the stator in another example. The schematic side view for demonstrating the drive unit in another example.

Hereinafter, an embodiment of a motor will be described with reference to FIGS.
FIG. 1 is an overall perspective view of a brushless motor M according to this embodiment, and an annular stator 13 fixed to a motor housing (not shown) is disposed outside a rotor 12 fixed to a rotating shaft 11. . The brushless motor M includes three single motor units stacked in the axial direction, and is configured from the top in the order of a U-phase motor unit Mu, a V-phase motor unit Mv, and a W-phase motor unit Mw. That is, the brushless motor M includes a U-phase stator 13a, a V-phase stator 13b, and a W-phase stator 13c, and three rotors respectively facing each other in the radial direction (in FIG. 1, only the U-phase rotor 12a is illustrated. ).

  As shown in FIG. 2, the U-phase stator 13 a in the stator 13 includes a first stator core 14 as a first stator core part, a second stator core 15 as a second stator core part, and a coil part 16.

  Specifically, the first stator core 14 is provided on one side in the axial direction (upper side in FIG. 2), and is a substantially annular plate-shaped first core base part in which a notch part 17 is formed in a part in the circumferential direction. 18 and a substantially cylindrical cylindrical wall 19 extending from the radially outer end of the first core base portion 18 to the other axial side (the lower side in FIG. 2). Further, the first stator core 14 has a part of the notch 17 corresponding to the notch 17 at a circumferentially equidistant position (in the present embodiment, a 30 ° spacing position) of the radially inner end of the first core base 18. The first claw-shaped magnetic poles 21 are provided at regular intervals (30 ° intervals) in the circumferential direction except for the portion 20 and project radially inward and extend in the axial direction. In the present embodiment, the circumferentially equidistant position is a 30 ° interval position, the missing portion 20 is one of them, and 12 first claw-shaped magnetic poles 21 are formed at 30 ° intervals. The configuration is such that the pieces are removed. In other words, 11 first claw-shaped magnetic poles 21 of the present embodiment are formed at intervals of 30 °, and a portion of the circumference that is 60 ° apart (a portion corresponding to the notch portion 17) is the missing portion 20.

The second stator core 15 has substantially the same shape as the first stator core 14, and similarly includes a second core base portion 22, a cylindrical wall 23, and a second claw-shaped magnetic pole 24.
The second stator core 15 has the second core base portion 22 opposed to the first core base portion 18 on the other axial side (the lower side in FIG. 2), and is opposed to the second claw-shaped magnetic pole 24. Is disposed adjacent to the first claw-shaped magnetic pole 21 in the circumferential direction while extending to one side in the axial direction.

  The coil portion 16 is formed by winding a conductor a plurality of times, and is disposed between the first core base portion 18 and the second core base portion 22 in the axial direction. The claw-shaped magnetic pole 21 and the second claw-shaped magnetic pole 24 are caused to function as different magnetic poles.

  Further, the V-phase stator 13b has substantially the same configuration as the U-phase stator 13a, and the notch portions 17 and the first claw-shaped magnetic poles 21 and 24 are compared with the U-phase stator 13a. The missing portion 20 is formed so that the angular position differs by 60 ° in electrical angle.

  The W-phase stator 13c has substantially the same configuration as the U-phase stator 13a, and the notch portions 17 and the first claw-shaped magnetic poles 21 and 24 are compared with the U-phase stator 13a. The missing portion 20 is formed so that the angular position differs by 120 ° in electrical angle.

  The V-phase stator 13b is fixed to a motor housing (not shown) by shifting the phase by 60 ° in the clockwise direction with respect to the U-phase stator 13a. The W-phase stator 13c is fixed to the motor housing with a phase shift of 120 ° in the clockwise direction with respect to the U-phase stator 13a. Thus, the stator 13 is configured such that the angular positions of the notches 17 and the missing portions 20 are the same.

A drive unit 31 is provided at the circumferential position of the missing part 20 and the notch part 17.
More specifically, as schematically shown in FIG. 3, the drive unit 31 includes a drive circuit 32 for controlling energization to the coil portion 16 embedded in the resin member 33 (in this embodiment, insert molding). Become. In addition, the drive circuit 32 of this embodiment consists of a board | substrate etc. in which drive IC was mounted, for example. The resin member 33 of the present embodiment is formed in a substantially rectangular parallelepiped having the same axial length as the stator 13, and the radially inner end portion of the resin member 33 is the radial direction of the first and second claw-shaped magnetic poles 21 and 24. An arc surface at the same radial position as the arc surface of the inner end portion, and the radially outer end portion of the resin member 33 is an arc surface at the same radial position as the arc surface of the radially outer end portions of the cylindrical walls 19 and 23. It is said that. The drive unit 31 (resin member 33) is fixed with the radially outer side fitted into the notch 17.

  Further, the resin member 33 according to the present embodiment is formed with a hole 34 through which a part of the coil portion 16 in the circumferential direction passes. Three holes 34 are formed in the axial direction so as to correspond to the respective coil portions 16 of the U-phase stator 13a, the V-phase stator 13b, and the W-phase stator 13c. Both ends 16 a and 16 b of each coil portion 16 are connected to the drive unit 31 and are electrically connected to the drive circuit 32.

  Further, in the resin member 33 of the present embodiment, a Hall IC 35 as a rotation sensor for detecting the rotation of the rotor 12 is embedded (in this embodiment, insert molding). Three Hall ICs 35 are arranged in the axial direction corresponding to the U-phase stator 13a, the V-phase stator 13b, and the W-phase stator 13c at the radially inner end of the resin member 33. Each Hall IC 35 is electrically connected to the drive circuit 32.

The drive circuit 32 controls energization of each coil unit 16 based on a command signal and power supply from the outside and a detection signal from the Hall IC 35.
The U-phase rotor 12a in the rotor 12 is disposed between the pair of rotor cores 42 on which the claw-shaped magnetic poles 41 are formed and the rotor cores 42 are axially magnetized so that the claw-shaped magnetic poles 41 are circumferentially moved. The so-called Randel structure is provided with field magnets 43 alternately functioning as different magnetic poles. Further, the V-phase rotor and the W-phase rotor (not shown) have the same configuration as the U-phase rotor 12a, and thus the description thereof is omitted. The V-phase rotor is fixed with an electrical angle of 120 ° shifted from the U-phase rotor 12a, and the W-phase rotor is shifted with an electrical angle of 240 ° with respect to the U-phase rotor 12a. Is fixed.

Next, the operation of the brushless motor M configured as described above will be described.
When a three-phase drive current is supplied to the U-phase, V-phase, and W-phase coil sections 16 by the drive circuit 32, a rotating magnetic field is generated in the stator 13, and the rotor 12 is driven to rotate. At this time, the rotation (rotation speed and direction) of the rotor 12 is detected by the Hall IC 35, and a three-phase drive current is supplied from the drive circuit 32 to each coil unit 16 at an optimal timing based on the detection signal. As a result, a rotating magnetic field is generated satisfactorily, and the rotor 12 is driven to rotate continuously.

Next, the characteristic effects of the above embodiment will be described below.
(1) The first and second claw-shaped magnetic poles 21 and 24 are provided at equal intervals in the circumferential direction except for some missing portions 20 at circumferentially equidistant positions. Since the drive circuit 32 for controlling energization to the coil unit 16 is provided, the drive circuit 32 is not required outside the stator 13. Therefore, an external (drive circuit) arrangement space can be reduced, and the wiring connecting the coil unit 16 and the drive circuit 32 can be shortened. Further, for example, noise from the drive circuit 32 is less likely to leak to the outside as compared with a drive circuit provided outside the stator.

  (2) Since the Hall IC 35 for detecting the rotation of the rotor 12 is provided at the circumferential position of the missing portion 20, a rotation sensor (Hall IC) is not required outside. Therefore, the external arrangement space can be further reduced, and the wiring connecting the drive circuit 32 and the Hall IC 35 can be shortened.

  (3) Since the drive circuit 32 has the drive unit 31 embedded in the resin member 33 and the drive unit 31 is provided at the circumferential position of the missing portion 20, for example, handling and assembly thereof are facilitated.

  (4) Since the resin member 33 of the drive unit 31 is formed with a hole 34 through which a part of the coil portion 16 in which the conductor is wound in multiple turns is formed in the circumferential direction, for example, the circumferential direction of the coil portion 16 It can arrange | position, holding a part of.

The above embodiment may be modified as follows.
In the above embodiment, the drive unit 31 (resin member 33) is formed in a substantially rectangular parallelepiped having the same axial length as the stator 13 including the U-phase stator 13a, the V-phase stator 13b, and the W-phase stator 13c. However, the present invention is not limited to this. For example, it may be changed to a substantially rectangular parallelepiped having the same axial length as that of the stator of one phase.

  For example, as shown in FIG. 4, in the U-phase stator 13a and the W-phase stator 13c, the missing portion 20 is not formed, and twelve first and second claw-shaped magnetic poles 21 and 24 are formed at intervals of 30 °. The drive unit 51 may be provided at the circumferential position of the missing portion 20 in the V-phase stator 13b. A drive circuit (not shown) is embedded in the resin member 52 of the drive unit 51, and three Hall ICs 53 are provided side by side in the circumferential direction. If it does in this way, since there are few missing parts 20 compared with the above-mentioned embodiment, motor efficiency can be improved rather than the above-mentioned embodiment.

  In the above embodiment, the resin member 33 of the drive unit 31 is formed with a hole 34 through which a part of the coil portion 16 in which the conductor is wound a plurality of times in the circumferential direction is formed. Although 16b is configured to be electrically connected to the drive circuit 32, these configurations may be changed.

  For example, as shown in FIG. In this example, the coil unit 61 is connected to the drive unit 62 at both ends at every turn and electrically connected to the drive circuit 63 embedded in the drive unit 62. The drive circuit 63 can control the energization of each turn of the coil unit 61. In this way, for example, some of the coil parts 61 can be energized according to the required output.

  In the above embodiment, the set of the first and second stator cores 14 and 15 and the coil portion 16 is provided for each phase, and the drive circuit 32 is the coil portion 16 of all phases (U phase, V phase and W phase). However, the present invention is not limited to this. For example, a drive circuit may be provided for each phase. That is, a drive circuit dedicated to the U phase, a drive circuit dedicated to the V phase, and a drive circuit dedicated to the W phase may be provided. In this way, for example, independent driving is possible for each phase.

In this case, the drive circuits provided for each phase may be electrically connected. In this way, for example, it is possible to control the energization to the coil unit 16 for each phase in association with each other.
For example, when a drive circuit is provided for each phase, each drive circuit may be embedded in a separate resin member to provide a drive unit for each phase. In this case, the drive units for each phase may be provided at equiangular intervals (120 ° intervals) in the circumferential direction of the stator. If it does in this way, the balance of the magnetic field which a stator generates becomes good, and it can reduce vibration and noise at the time of a drive.

  In the above embodiment, the drive unit 31 is provided at the circumferential position of the missing portion 20 and the Hall IC 35 is provided in the drive unit 31. However, the present invention is not limited to this, and the rotation of the rotor 12 is not limited thereto. A rotation sensor (Hall IC) for detection may be provided outside the stator 13.

  -The drive unit 31 (resin member 33) of the said embodiment may be changed into another shape, if it can be arrange | positioned in the circumferential direction position of the missing part 20. FIG. For example, the resin member 33 of the drive unit 31 of the above embodiment is provided with a hole 34 for passing a part in the circumferential direction of the coil portion 16 in which a conductor is wound around a plurality of turns. Alternatively, the resin member 33 may be changed to be formed so as to avoid the coil portion 16 without forming the hole 34. Further, as long as the drive circuit 32 can be disposed at the circumferential position of the missing portion, the resin member 33 may not be provided.

  In the above embodiment, the rotor 12 is embodied as the inner rotor type brushless motor M in which the rotor 12 is disposed on the inner peripheral side of the stator 13. However, the present invention is not limited to this, and the outer rotor type motor in which the rotor is disposed on the outer peripheral side of the stator is used. It may be embodied.

  DESCRIPTION OF SYMBOLS 12 ... Rotor, 13 ... Stator, 14 ... 1st stator core (1st stator core part), 15 ... 2nd stator core (2nd stator core part), 16, 61 ... Coil part, 18 ... 1st core base part, 20 ... Missing , 21 ... first claw-shaped magnetic pole, 22 ... second core base, 24 ... second claw-shaped magnetic pole, 31, 51, 62 ... drive unit, 32, 63 ... drive circuit, 33, 52 ... resin member, 34 ... hole.

Claims (8)

A first stator core portion having a first core base portion provided on one side in the axial direction and a plurality of first claw-shaped magnetic poles extending in the circumferential direction from the radial end of the first core base portion to the other side in the axial direction When,
A second core base portion provided on the other side in the axial direction, and a plurality of second claw-shaped magnetic poles extending in a circumferential direction from a radial end portion of the second core base portion to one side in the axial direction, A second stator core portion in which the second claw-shaped magnetic pole is disposed adjacent to the first claw-shaped magnetic pole in a circumferential direction while a two-core base portion is opposed to the first core base portion;
A coil portion that is disposed between the first core base portion and the second core base portion in the axial direction, and causes the first claw-shaped magnetic pole and the second claw-shaped magnetic pole to function as different magnetic poles based on energization. And a stator with
The first and second claw-shaped magnetic poles are provided at equal intervals in the circumferential direction except for some missing portions at circumferentially equal positions.
A stator in which a drive circuit for controlling energization to the coil portion is provided at a circumferential position of the missing portion. The stator according to claim 1,
A stator in which a rotation sensor for detecting rotation of the rotor is provided at a circumferential position of the missing portion. The stator according to claim 1 or 2,
A set of the first and second stator core parts and the coil part is provided for each phase,
A stator having the drive circuit for each phase. The stator according to claim 3,
The stator in which the drive circuits are electrically connected to each other. The stator according to any one of claims 1 to 4,
The stator, wherein the drive circuit includes a drive unit embedded in a resin member, and the drive unit is provided at a circumferential position of the missing portion. The stator according to claim 5, wherein
The stator according to claim 1, wherein the resin member of the drive unit is formed with a hole through which a part of the coil portion formed by winding a plurality of conductors passes in the circumferential direction. The stator according to any one of claims 1 to 5,
The coil portion is electrically connected to the drive circuit at both ends for each turn,
The stator, wherein the drive circuit is capable of controlling energization for each round of the coil section.   A motor comprising the stator according to claim 1.