JP6477358B2 - motor - Google Patents

Description

  The present invention relates to a motor.

  2. Description of the Related Art Conventionally, a motor stator has a so-called Landel-type structure, and includes, for example, first and second stator cores having claw-shaped magnetic poles and windings disposed between the first and second stator cores. There is a structure in which a plurality of stator portions that allow each claw-shaped magnetic pole to function as different magnetic poles by energizing a winding are laminated in the axial direction (see, for example, Patent Document 1).

JP 2013-2226026 A

  By the way, as a rotor with respect to the above stators, a rotor in which a plurality of rotor parts having permanent magnets opposed to the respective stator parts are arranged in the axial direction can be considered. In such a case, for example, if a sensor for detecting the magnetic flux of the permanent magnet of the rotor is provided so as to oppose the axial end of the rotor in order to detect the rotation angle of the rotor, the sensor detects the magnetic flux from the stator. There is a problem that it is difficult to accurately detect the magnetic flux of the permanent magnet (in a form close to a sine wave).

  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 accurately detect the magnetic flux of the permanent magnet of the rotor.

  A motor that solves the above problems includes first and second claw-shaped magnetic poles each having a radially extending portion that extends in the radial direction and a magnetic pole portion that extends in the axial direction from the tip of the radially extending portion. A stator portion having a plurality of stator portions in the axial direction having a stator core and windings provided between the first and second stator cores, and a rotor portion having a permanent magnet facing the magnetic pole portion in the axial direction. And the same number of rotors, and a sensor for detecting the magnetic flux of the permanent magnets provided between the permanent magnets in the axial direction.

  According to the same configuration, the sensor for detecting the magnetic flux of the permanent magnet in the rotor portion is provided between the permanent magnets in the axial direction, and thus, for example, provided to face the axial end portion of the rotor. Compared to the case, it is less affected by the magnetic flux from the stator, and the magnetic flux of the permanent magnet can be accurately detected (in a form close to a sine wave). Thereby, for example, the rotation angle of the rotor can be easily detected with high accuracy.

In the motor, the sensor is preferably provided within an angular range between circumferential directions of magnetic pole portions adjacent to each other in the circumferential direction in the stator portion corresponding to the permanent magnet to be detected.
According to this configuration, the sensor is provided within an angular range between the circumferential direction of the magnetic pole portions adjacent to each other in the circumferential direction in the stator portion corresponding to the permanent magnet to be detected. It becomes difficult to be affected, and the magnetic flux of the permanent magnet can be detected with higher accuracy.

In the motor, the sensor is preferably provided on a substrate interposed between the stator portions in the axial direction.
According to this configuration, the sensor can be easily provided because it is provided on the substrate interposed between the stator portions in the axial direction.

In the motor, it is preferable that the substrate has a drive circuit that supplies a drive current to the winding.
According to this configuration, since the substrate includes a drive circuit that supplies a drive current to the winding, for example, the number of substrates can be reduced as compared with the case where they are provided on separate substrates. Further, since the substrate is interposed between the stator portions in the axial direction, it is close to both of the windings of each stator portion and can be easily connected to each winding.

In the motor, the sensor is preferably provided such that a detection surface thereof is orthogonal to the circumferential direction.
According to this configuration, since the sensor is provided such that its detection surface is orthogonal to the circumferential direction, the magnetic flux of the permanent magnet can be detected with high accuracy.

  In the motor of the present invention, the magnetic flux of the permanent magnet of the rotor can be detected with high accuracy.

The perspective view of the motor in one Embodiment. The partial exploded perspective view of the motor in one embodiment. 1 is a partial cross-sectional view of a motor in one embodiment. The perspective view of the drive circuit board in one embodiment. The top view of the connection terminal in one Embodiment. The top view of the connection terminal in another example. The perspective view of the drive circuit board in another example. The disassembled perspective view for demonstrating the connection structure in another example.

Hereinafter, an embodiment of a motor will be described with reference to FIGS.
As shown in FIG. 1, the motor 1 of the present embodiment includes an annular stator 2 and a rotor 3 that is disposed inside the stator 2 and is rotatably supported.

  As shown in FIG. 2, the stator 2 is formed by arranging (stacking) an A-phase stator portion 2 a and a B-phase stator portion 2 b having a Landel structure in parallel in the axial direction. The rotor 3 includes a surface magnet type A-phase rotor portion 3a and a B-phase rotor portion 3b arranged (stacked) side by side in the axial direction.

  The A-phase stator portion 2a and the B-phase stator portion 2b constituting the stator 2 have the same configuration, and have a first stator core 4, a second stator core 5, and a winding 6, respectively. The first stator core 4 has an outer wall annular portion 4a and a first claw-shaped magnetic pole 4b, and the first claw-shaped magnetic pole 4b extends in the radial direction extending radially inward from the axial end of the outer wall annular portion 4a. 4c and a magnetic pole portion 4d extending in the axial direction from the tip of the radially extending portion 4c. The second stator core 5 has an outer wall annular portion 5a and a second claw-shaped magnetic pole 5b, and the second claw-shaped magnetic pole 5b extends radially inward from the axial end of the outer wall annular portion 5a. An extending portion 5c and a magnetic pole portion 5d extending in the axial direction from the tip of the radially extending portion 5c are provided.

  Then, the first stator core 4 and the second stator core 5 are wound by the radially extending portions 4c and 5c with the first claw-shaped magnetic poles 4b and the second claw-shaped magnetic poles 5b being alternately arranged in the circumferential direction. Are assembled so as to sandwich them in the axial direction. Thereby, 12 magnetic pole portions 4d and 5d are formed in the circumferential direction. In addition, in the present embodiment, the A-phase stator portion 2a and the B-phase stator portion 2b configured as described above are arranged in parallel in the axial direction so that the second stator cores 5 face each other (facing each other). The B-phase stator portion 2b in the lower stage (lower stage in FIG. 2) is juxtaposed with the upper-stage A-phase stator portion 2a so as to deviate by 45 ° counterclockwise in electrical angle.

  As shown in FIG. 3, in this embodiment, the end 6 a of each winding 6 is drawn out radially outward of the first and second stator cores 4, 5 and is provided on a cover of a housing (not shown) of the motor 1. The drive circuit board 7 is electrically connected to the connection terminal 8.

  As shown in FIG. 4, the drive circuit board 7 of the present embodiment is formed in a substantially U shape having a recess 7a when viewed from the plane orthogonal direction, and the connection terminal 8 is the bottom of the recess 7a when viewed from the plane orthogonal direction. It is provided so that it may be accommodated in the recessed part 7a, protruding from.

  As shown in FIG. 5, the connection terminal 8 of the present embodiment has a plurality of grooves 8a on both sides in the width direction when viewed from the plane orthogonal direction, and the end 6a of the winding 6 fits into the groove 8a. In this way, the wire is wound (spirally) on the connection terminal 8 and is electrically connected to the connection terminal 8 by removing the coating at the wound portion.

  As shown in FIGS. 2 and 3, the A-phase rotor portion 3 a and the B-phase rotor portion 3 b constituting the rotor 3 have the same configuration, and are respectively fixed to the disk-shaped rotor core 11 and the outer periphery of the rotor core 11. The magnetic pole portions 4d and 5d have an annular permanent magnet 12 opposed in the radial direction. The permanent magnet 12 is magnetized so as to have 12 magnetic poles (N pole and S pole) alternately in the circumferential direction. A rotary shaft 13 is press-fitted into the center hole of each rotor core 11, and the rotary shaft 13 is rotatably supported with respect to a housing (not shown). In this embodiment, the A-phase rotor portion 3a and the B-phase rotor portion 3b configured as described above are arranged such that the lower (in FIG. 2, lower) B-phase rotor portion 3b is replaced with the upper A-phase rotor portion 3a. On the other hand, they are arranged side by side in the clockwise direction with an electrical angle of 45 °.

  Here, the motor 1 of the present embodiment is provided between the permanent magnets 12 in the rotor 3 in the axial direction, and is used for the A-phase sensor 21 and the B-phase sensor as sensors for detecting the magnetic flux of the permanent magnet 12. A sensor 22 is provided.

  Specifically, as shown in FIG. 3, first, the A-phase rotor portion 3a and the B-phase rotor portion 3b of the rotor 3 are arranged side by side with the rotor cores 11 sandwiching a disk-shaped rotor spacer member 23a in the axial direction. . Thereby, the permanent magnet 12 of the A-phase rotor portion 3a and the permanent magnet 12 of the B-phase rotor portion 3b are arranged side by side so as to have a gap in the axial direction.

  Further, in the stator 2, a substrate 24 is interposed between the A-phase stator portion 2 a and the B-phase stator portion 2 b in a mode sandwiched between a pair of disk-like stator spacer members 23 b in the axial direction. Yes. The substrate 24 has an inward extending portion 24a extending radially inward to the space between the permanent magnets 12 (gap), and the A-phase sensor 21 and the B-phase sensor 22 are provided at the distal end portions of the inward extending portion 24a. Is provided. The A-phase sensor 21 and the B-phase sensor 22 are Hall ICs in this embodiment, and the A-phase sensor 21 is a sensor for detecting the magnetic flux of the permanent magnet 12 of the A-phase rotor portion 3a. The B-phase sensor 22 is a sensor for detecting the magnetic flux of the permanent magnet 12 of the B-phase rotor portion 3b.

  As shown in FIG. 2, the A-phase sensor 21 has an angular range θ1 between the circumferential directions of the magnetic pole portions 4d and 5d adjacent to each other in the circumferential direction in the A-phase stator portion 2a corresponding to the permanent magnet 12 to be detected. In the present embodiment, the magnetic pole portions 4d and 5d are provided at the center position between the circumferential directions. Further, the B-phase sensor 22 is within an angular range between the circumferential directions of the magnetic pole portions 4d and 5d adjacent to each other in the circumferential direction in the B-phase stator portion 2b corresponding to the permanent magnet 12 to be detected. Then, it is provided at the center position between the magnetic pole portions 4d and 5d in the circumferential direction. The A-phase sensor 21 and the B-phase sensor 22 are electrically connected to the drive circuit board 7 by signal lines (not shown) extending from the board 24.

Next, the operation of the motor 1 configured as described above will be described.
When a drive current is supplied to the winding 6 from the drive circuit of the drive circuit board 7, a rotating magnetic field is generated in the stator 2 (A-phase stator portion 2a and B-phase stator portion 2b), and the rotor 3 (A-phase rotor portion). 3a and the B-phase rotor 3b) are driven to rotate. At this time, the magnetic flux of each permanent magnet 12 is detected by the A-phase sensor 21 and the B-phase sensor 22, and a driving current is supplied from the driving circuit to each winding 6 at the optimum timing based on the detection signal of the magnetic flux. Is done. Thereby, a rotating magnetic field is generated satisfactorily, and the rotor 3 is driven to rotate favorably.

Next, the characteristic effects of the above embodiment will be described below.
(1) The A-phase sensor 21 and the B-phase sensor 22 for detecting the magnetic flux of the permanent magnet 12 of the A-phase rotor portion 3a and the B-phase rotor portion 3b are provided between the permanent magnets 12 in the axial direction. . Thereby, for example, compared with the case where the sensor is provided so as to face the axial end portion of the rotor 3, it is less affected by the magnetic flux from the stator 2, and the magnetic flux of the permanent magnet 12 is accurately (sinusoidal). Can be detected. As a result, for example, the rotation angle of the rotor 3 (the A-phase rotor portion 3a and the B-phase rotor portion 3b) can be detected easily and accurately, and the rotor 3 can be driven to rotate favorably.

  (2) The A-phase sensor 21 is provided in an angular range θ1 between the circumferential directions of the magnetic pole portions 4d and 5d adjacent in the circumferential direction in the A-phase stator portion 2a corresponding to the permanent magnet 12 to be detected. . The B-phase sensor 22 is provided within an angular range between the circumferential directions of the magnetic pole portions 4d and 5d adjacent in the circumferential direction in the B-phase stator portion 2b corresponding to the permanent magnet 12 to be detected. Therefore, the magnetic flux portions 4d and 5d of the stator 2 (A-phase stator portion 2a and B-phase stator portion 2b) are less affected by the magnetic flux, and the magnetic flux of the permanent magnet 12 can be detected with higher accuracy. .

  (3) Since the A-phase sensor 21 and the B-phase sensor 22 are provided on the substrate 24 interposed between the A-phase stator portion 2a and the B-phase stator portion 2b in the axial direction, they can be easily provided. .

  (4) Since the end portion 6a of the winding 6 is wound (spirally) around the connection terminal 8 and is electrically connected to the connection terminal 8, the end of the winding 6 is easily and firmly The part 6 a can be connected to the connection terminal 8. The connection terminal 8 has a groove 8a, and the end 6a of the winding 6 is wound around the connection terminal 8 (spiral) so as to fit into the groove 8a. The end 6 a can be connected to the connection terminal 8. The drive circuit board 7 is formed in a substantially U shape having a recess 7a when viewed from the plane orthogonal direction, and the connection terminal 8 is accommodated in the recess 7a while protruding from the bottom of the recess 7a when viewed from the plane orthogonal direction. Therefore, for example, the connection terminal 8 can be made thinner as compared with the connection terminal 8 protruding from the plane of the drive circuit board 7.

The above embodiment may be modified as follows.
In the above embodiment, the A-phase sensor 21 is provided within the angular range θ1 between the circumferential directions of the magnetic pole portions 4d and 5d adjacent in the circumferential direction in the A-phase stator portion 2a corresponding to the permanent magnet 12 to be detected. However, the present invention is not limited to this, and it may be provided outside the angle range θ1. Similarly, the B-phase sensor 22 may be provided outside the angular range between the magnetic pole portions 4d and 5d in the circumferential direction.

  In the above embodiment, the A-phase sensor 21 and the B-phase sensor 22 are provided on the substrate 24 interposed between the A-phase stator portion 2a and the B-phase stator portion 2b in the axial direction. Any other configuration may be used as long as it can be provided between the magnets 12 in the axial direction.

  In the above embodiment, the drive circuit board 7 provided with the drive circuit is provided separately from the board 24 provided with the A-phase sensor 21 and the B-phase sensor 22, but is not limited thereto. For example, the substrate 24 may be provided with a drive circuit. In this way, the drive circuit board 7 becomes unnecessary, and the number of boards can be reduced. Further, since the substrate 24 is interposed between the A-phase stator portion 2a and the B-phase stator portion 2b in the axial direction, it is close to both of the windings 6 and can be easily connected to the windings 6. Become.

  In the above embodiment, although not particularly mentioned, the A-phase sensor 21 and the B-phase sensor 22 may be provided so that their detection surfaces are orthogonal to the circumferential direction. If it does in this way, it will become possible to detect the magnetic flux of permanent magnet 12 with sufficient accuracy. Of course, the A-phase sensor 21 and the B-phase sensor 22 may be provided so that their detection surfaces are orthogonal to the axial direction.

-You may change the shape and structure of the connection terminal 8 of the said embodiment.
For example, as shown in FIG. 6, the connection terminal 31 may be changed to a connection terminal 31 having a plurality of grooves 31 a on both sides in the width direction when viewed from the plane orthogonal direction and wider toward the tip.

  Further, for example, as shown in FIG. 7, end portions 6a of a plurality of windings 6 (for example, winding of an A-phase stator portion 2a) are connected to a plurality of connection terminals 33 provided with insulating members 32 (shown by bold lines) interposed therebetween. Alternatively, the winding start and winding end portions 6a) of the wire 6 may be alternately wound so that only the portions corresponding to the connection terminals 33 are removed and electrically connected.

In the above embodiment, the connection terminal 8 is provided along the plane of the drive circuit board 7, but the end 6a of the winding 6 may be connected to the drive circuit board in a different configuration.
For example, you may change as shown in FIG. In this example, a plurality of connection terminals 41 to 44 extending along the axial direction of the motor 1 are juxtaposed in an arc shape so as to fit between the outer periphery of the stator 2 and a housing (not shown). An insulating member 45 (shown by a thick line) is interposed between the circumferential directions. Then, by making the lengths of the connection terminals 41 to 44 different from each other, the connection terminals 41 to 44 are provided so that the circumferential end surfaces thereof are exposed, and the end portions 46a of the windings 46 are connected to the exposed surfaces. Yes. The upper end portions in the axial direction of the connection terminals 41 to 44 are electrically connected to the upper drive circuit board 47. This example (see FIG. 8) is an example of a motor having three stator portions (three phases), and one end portion 46a of the winding 46 of each phase is connected to the connection terminal 41 serving as a neutral point. The example is shown in which the other end 46a of the winding 46 of each phase is connected to the connection terminals 42 to 44 corresponding to the respective phases.

  2 ... Stator, 2a ... A phase stator part (stator part), 2b ... B phase stator part (stator part), 3 ... Rotor, 3a ... A phase rotor part (rotor part), 3b ... B phase rotor part (rotor part) 4) 1st stator core, 4b ... 1st claw-shaped magnetic pole (claw-shaped magnetic pole), 4c, 5c ... Radial extension part, 4d, 5d ... Magnetic pole part, 5 ... 2nd stator core, 5b ... 2nd claw shape Magnetic pole (claw-shaped magnetic pole), 6 ... winding, 12 ... permanent magnet, 21 ... A-phase sensor (sensor), 22 ... B-phase sensor (sensor), 24 ... substrate, .theta.1 ... angle range.

Claims (5)

First and second stator cores having claw-shaped magnetic poles each having a radially extending portion extending in the radial direction and a magnetic pole portion extending in the axial direction from the tip of the radially extending portion, and the first and second A stator having a plurality of stator portions in the axial direction having windings provided between the stator cores;
A rotor having the same number of rotor portions as the stator portions in the axial direction, having a permanent magnet facing the magnetic pole portion;
A motor provided with a sensor provided between the permanent magnets in an axial direction for detecting a magnetic flux of the permanent magnet. The motor according to claim 1,
The motor according to claim 1, wherein the sensor is provided in an angular range between circumferential directions of magnetic pole portions adjacent to each other in a circumferential direction in a stator portion corresponding to a permanent magnet to be detected. The motor according to claim 1 or 2,
The motor according to claim 1, wherein the sensor is provided on a substrate interposed between the stator portions in the axial direction. The motor according to claim 3, wherein
The motor according to claim 1, wherein the substrate has a drive circuit for supplying a drive current to the winding. The motor according to any one of claims 1 to 4,
The motor, wherein the sensor is provided so that its detection surface is orthogonal to the circumferential direction.