JP2004080897A - Dynamo-electric machine - Google Patents

Abstract

A rotating electric machine with improved detection accuracy of the state of rotation of a rotor is provided.
A stator has a plurality of coils arranged on an arc of a circle excluding a part thereof, and is molded with resin or the like. Encoder substrate mounting portions 33a and 33b formed of resin integrally with the stator 31 extend from the removed portions. Protrusions 34a and 34b are respectively formed on the encoder substrate mounting portions 33a and 33b. An encoder board 51 for detecting the state of rotation of the rotor is mounted and fixed to the encoder board mounting portions 33a and 33b.
[Selection] Fig. 2

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a rotating electric machine such as an electric motor used for an electric motorcycle or the like, and more particularly to a rotating electric machine capable of improving accuracy in detecting a rotation state of a rotor.
[Prior art]
In recent years, an axial gap type electric motor is used for a rear axle as a power source of an electric motorcycle. Such a motor includes a stator fixed to a rear arm extending from a vehicle body frame, and a rotor that rotates with respect to the stator and transmits power to rear wheels.
[0002]
Such an electric motor requires an encoder board on which an element for detecting the state of rotation of the rotor is mounted, and such an encoder board is mounted on a case or the like of the electric motor.
[0003]
Further, the inverter that supplies power to the stator is fixed to a case that houses the stator via an elastic material. The elastic material is rubber or the like, and is used for the purpose of preventing vibration to the inverter.
[0004]
The element for detecting the state of rotation of the rotor is provided at a position for detecting when the phase has reached a specific electrical angle, for example, 180 °. Of the circuit.
[0005]
[Problems to be solved by the invention]
However, since the relative position between the case on which the substrate is mounted and the stator fluctuates due to vibration of the electric motorcycle or the like, it has been difficult to improve the accuracy in detecting the state of rotation of the rotor.
[0006]
Further, even when the inverter that supplies power to the stator is fixed to the case that houses the stator via an elastic material, it is necessary to maintain the electrical connection between the substrate that detects the state of rotation of the rotor and the inverter. There is.
[0007]
Also, if the element for detecting the state of rotation of the rotor is provided at a position for detecting when the phase has reached a specific electrical angle, for example, 180 °, the elements of each phase will be separated from each other due to the size of the electric motor. As a result, it is difficult to reduce the size of the encoder board.
[0008]
Therefore, an object of the present invention is to provide a rotating electric machine with improved detection accuracy of the state of rotation of the rotor.
[0009]
Another object of the present invention is to provide a rotating electrical machine that can maintain electrical connection between a substrate that detects the state of rotation of a rotor and an inverter while preventing vibrations to the inverter.
[0010]
Another object of the present invention is to provide a rotating electric machine that can reduce the size of a board that detects the state of rotation of a rotor.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, the present invention according to claim 1 is a rotating electric machine characterized in that a substrate for detecting a rotation state of the rotor is mounted on a stator that rotationally drives the rotor.
[0012]
According to a second aspect of the present invention, there is provided the rotating electric machine according to the first aspect, wherein the stator has a projection on a surface on which the substrate is mounted, and the substrate has a hole through which the projection is inserted.
[0013]
According to a third aspect of the present invention, there is provided the rotating electric machine according to the second aspect, wherein at least two sets of the projections and the holes are provided, and one set of the projections cannot be inserted into the other set of the holes. According to a fourth aspect of the present invention, the stator includes a plurality of coils arranged on an arc excluding a part of a substantially circle, and the substrate is arranged on the removed arc. A rotating electric machine according to any one of claims 1 to 3, wherein
[0014]
According to a fifth aspect of the present invention, an inverter for feeding power to a stator is fixed to a case accommodating the stator via an elastic material, and a substrate for detecting a rotation state of a rotor rotationally driven by the stator and the inverter are provided. The rotating electric machine is characterized by being electrically connected by a flexible wiring member.
[0015]
According to a sixth aspect of the present invention, the stator includes a plurality of coils arranged on an arc excluding a part of a substantially circle, and the substrate is arranged on the removed arc. A rotating electric machine according to claim 5.
[0016]
The present invention according to claim 7, wherein a first detection element provided at a position for detecting when a phase has a specific electrical angle, and an electrical angle in which a phase different from the phase is shifted by 90 ° from the specific electrical angle And a second detection element provided at a position for detecting the time when the rotation of the rotating electric machine is reached.
[0017]
The present invention according to claim 8, wherein the logic of the processing on the detection result detected by the second detection element is inverted with respect to the logic of the processing on the detection result detected by the first detection element. It is a rotating electric machine.
[0018]
According to a ninth aspect of the present invention, there is provided a stator having a plurality of coils arranged on an arc excluding a part of a substantially circle, wherein the substrate is arranged on the removed arc. A rotating electric machine according to claim 7 or 8.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 is a side view of an electric motorcycle to which the electric motor according to the present invention is applied.
[0021]
The electric motorcycle 1 shown in FIG. 1 includes a head pipe 2 at an upper front portion of a vehicle body, and a steering shaft (not shown) is rotatably inserted into the head pipe 2. A steering wheel 3 is attached to the upper end of the steering shaft. Grips 4 are attached to both ends of the handle 3, and the grip 4 on the right side (rear side in FIG. 1), not shown, constitutes a rotatable throttle grip.
[0022]
Upper portions of a pair of left and right front forks 5 are attached to a lower portion of the head pipe 2, and a front wheel 6 is rotatably supported by a front axle 7 at a lower end of each front fork 5. A meter 8 is arranged at the center of the handle 3, a headlamp 9 is arranged below the meter 8, and flasher lamps 10 (only one is shown in FIG. 1) are provided on both sides thereof. Have been.
[0023]
A pair of left and right body frames 11 extend from the head pipe 2 toward the rear of the vehicle body. That is, the vehicle body frame 11 has a round pipe shape, extends obliquely downward from the head pipe 2 toward the rear of the vehicle body, is bent in an arc shape rearward, and extends substantially horizontally to the rear of the vehicle body. A pair of left and right body frames 12 extend obliquely upward from the rear end of each body frame 11, and are connected to each other behind the seat 13. A battery 14 is arranged between the pair of left and right body frames 12.
[0024]
The left and right body frames 12 are connected to an inverted U-shaped seat stay (not shown), and are supported by a pair of left and right stays 16 (only one is shown). The seat 13 is arranged on the seat stay so as to be openable and closable.
[0025]
A tail lamp 17 is attached to the rear surface of a rear fender 16 attached to the rear end of the vehicle body frame 12, and flasher lamps 18 (only one is shown) are disposed on the left and right sides.
[0026]
On the other hand, a pair of left and right rear arm brackets 19 (only one is shown) are welded to the rear ends of the left and right body frames 11, respectively. It is freely supported. A rear wheel 22, which is a driving wheel, is rotatably supported at the rear end of the rear arm 20, and the rear arm 20 and the rear wheel 22 are suspended from the body frame 12 by a rear cushion 23.
[0027]
A foot step 24 (only one is shown) is attached below the left and right body frames 11, and a side stand 25 is provided below the rear arm 20 so as to be rotatably supported by a shaft 26. The side stand 25 is biased toward the closing side by a return spring 27.
[0028]
A substantially circular axial electric motor 28 that is flat and thin in the vehicle width direction is accommodated in a substantially circular portion at the rear end of the rear arm 20. The electric motor 28 is a three-phase motor.
[0029]
FIG. 2 is a diagram showing the configuration of the stator of the electric motor 28 and its surroundings.
[0030]
In FIG. 2, the drawing corresponds to the right side of the vehicle body, and the drawing left corresponds to the front side.
[0031]
The stator 31 of the electric motor 28 is housed inside a case 201 which is a housing at the rear end of the rear arm 20, and is fixed by several bolts 202. The stator 31 rotationally drives a rotor not shown (hereinafter simply referred to as a rotor). The stator 31 is formed by arranging a plurality of coils 32 on an arc of a circle excluding a part, and is molded with resin or the like. Encoder substrate mounting portions 33a and 33b formed of the resin integrally with the stator 31 extend to the removed portions. Protrusions 34a and 34b are respectively formed on the encoder substrate mounting portions 33a and 33b. An encoder board 51 for detecting the state of rotation of the rotor is mounted and fixed to the encoder board mounting portions 33a and 33b. Holes 52a and 52b are formed in the encoder board 51 at positions corresponding to the projections 34a and 34b, and the projections 34a and 34b are inserted into the holes 52a and 52b, respectively, to position the encoder board 51. . Therefore, the accuracy of the relative position between the stator 31 and the encoder board 51 is improved. The encoder board 51 is fixed to the encoder board mounting portions 33a, 33b by bolts 60,60.
[0032]
The stator 31 has a plurality of coils 32 arranged on an arc of a circle excluding a part thereof, and the encoder board 51 is arranged on the eliminated arc. realizable.
[0033]
The projections 34a and 34b are both square when viewed from above, but the size of the projections 34b when viewed from above is larger than the size of the projections 34a. The shape / size of the holes 52a, 52b is adjusted to the shape / size of the protrusions 34a, 34b, respectively. Therefore, even if the encoder board 51 is mounted upside down, the large protrusion 34b cannot be inserted into the small hole 52a, so that a mounting error can be prevented. The protrusions and holes may be made different in shape so that they cannot be inserted.
[0034]
An inverter 41 that is electrically connected to the stator 31 of the electric motor 28 and can supply power to the stator 31 is fixed to the case 201 via an elastic material (not shown). The elastic material is rubber or the like, and is used for the purpose of preventing vibration to the inverter 41 and the like. The encoder board 51 and the inverter 41 are electrically connected by a flexible wire harness 53. Note that the wire harness 53 is provided with a coating.
[0035]
Therefore, the electrical connection can be maintained even if the relative position between the encoder board 51 and the inverter 41 fluctuates due to vibration during traveling. Note that a flexible substrate or the like may be used instead of the wire harness 53.
[0036]
On the surface of the encoder board 51, magnetic pole detection elements 54a, 54b and 54c such as Hall sensors are mounted. The magnetic pole detection elements 54a and 54b (corresponding to the first detection elements) are arranged at positions for detecting when the electric angle of the U phase and the V phase in the electric motor 28 is 180 ° (for example, the coil current is maximum). . Specifically, a magnetic pole detection element 54a is provided at a position relative to the rotation axis P with respect to the coil 32a, and a magnetic pole is detected at a position relative to the rotation axis P with respect to the rotation axis P of the adjacent coil 32b shifted by a mechanical angle (θ1 = 20 °) with respect to the coil 32a. A detection element 54b is provided. With the same arrangement, the position for detecting when the electrical angle of the W phase is 180 degrees is the position indicated by C in FIG. 2, that is, the relative position of the coil 32c adjacent to the coil 32b with respect to the rotation axis P. However, if the encoder board 51 is enlarged to the position C, the cost increases, and the number of coils 32 may be reduced. Therefore, in the present embodiment, the magnetic pole detecting element 54c (the second magnetic pole detecting element) is located at a position for detecting when the electrical angle of the W phase is 90 degrees, that is, a position shifted by 90 electrical degrees (θ2) in electrical angle from the position C. And a detection circuit (not shown) for processing the detection result detected by each magnetic pole detection element, the processing logic for the detection result of the W phase detected by the magnetic pole detection element 54 c The logic of the processing for the detection results of the U-phase and V-phase detected by the elements 54a and 54b is inverted. Therefore, in this embodiment, cost reduction is realized by downsizing the encoder board 51.
[0037]
Although this embodiment is an electric motor, the present invention can be applied to a rotating electric machine including a generator.
[0038]
【The invention's effect】
As described above, the present invention according to claim 1 is a rotating electric machine characterized in that a substrate for detecting the state of rotation of the rotor is attached to the stator that drives the rotor to rotate. Can be accurately detected.
[0039]
According to a second aspect of the present invention, there is provided the rotating electric machine according to the first aspect, wherein the stator has a projection on a surface on which the substrate is mounted, and a hole through which the projection is inserted is formed in the substrate. Further, accurate positioning of the substrate can be performed.
[0040]
According to a third aspect of the present invention, there is provided the rotating electric machine according to the second aspect, wherein at least two sets of the projections and the holes are provided, and one set of the projections cannot be inserted into the other set of the holes. It is possible to prevent a mistake in the work of mounting the cover upside down.
[0041]
According to a fourth aspect of the present invention, the stator includes a plurality of coils arranged on an arc excluding a part of a substantially circle, and the substrate is arranged on the removed arc. Since it is the rotating electric machine according to any one of claims 1 to 3, it can be configured as a more compact rotating electric machine.
[0042]
According to a fourth aspect of the present invention, an inverter for feeding power to a stator is fixed to a case accommodating the stator via an elastic material, and a board for detecting a rotation state of a rotor rotationally driven by the stator and the inverter. Since the rotating electric machine is characterized by being electrically connected by a flexible wiring member, the electric connection can be maintained even if the relative position between the substrate and the inverter fluctuates.
[0043]
According to a fifth aspect of the present invention, the stator is configured such that a plurality of coils are arranged on an arc excluding a part of a substantially circle, and the substrate is arranged on the eliminated arc. Since the rotating electric machine according to the fourth aspect is characterized in that the rotating electric machine can be configured more compactly.
[0044]
The present invention according to claim 6, wherein a first detection element provided at a position for detecting when a phase has a specific electrical angle, and an electrical angle in which a phase different from the phase is shifted by 90 ° from the specific electrical angle Since the rotating electric machine includes a substrate having a second detection element provided at a position for detecting the time when the rotation of the electric motor is reached, the size of the substrate can be reduced.
[0045]
According to a seventh aspect of the present invention, the logic of the processing on the detection result detected by the second detection element is inverted with respect to the logic of the processing on the detection result detected by the first detection element. Since the rotating electric machine is used, a detection result detected by the substrate can be used for feedback control or the like.
[0046]
The invention according to claim 8 is characterized in that the stator has a plurality of coils arranged on an arc excluding a part of a substantially circle, and the substrate is arranged on the removed arc. Since the rotating electric machine according to claim 6 or 7, the rotating electric machine can be configured more compactly.
[Brief description of the drawings]
FIG. 1 is a side view of an electric motorcycle to which an electric motor according to the present invention is applied.
FIG. 2 is a diagram showing a configuration of a stator of an electric motor 28 and its periphery.
[Explanation of symbols]
Reference Signs List 1 electric motorcycle 28 electric motor 31 stator 32 coils 33a, 33b encoder board mounting parts 34a, 34b protrusion 51 encoder boards 52a, 52b hole 53 wire harnesses 54a, 54b, 54c magnetic pole detecting element

Claims (9)

A rotating electric machine, wherein a substrate for detecting a rotation state of the rotor is attached to a stator that drives the rotor to rotate. 2. The rotating electric machine according to claim 1, wherein the stator has a protrusion on a surface on which the substrate is mounted, and a hole through which the protrusion is inserted is formed in the substrate. 3. The rotating electric machine according to claim 2, wherein at least two sets of the projections and the holes are provided, and one set of the projections cannot be inserted into the other set of the holes. 4. The stator according to claim 1, wherein the stator includes a plurality of coils arranged on an arc excluding a part of a substantially circle, and the substrate is arranged on the removed arc. The rotating electric machine according to any one of the above. An inverter that supplies power to the stator is fixed to a case that houses the stator via an elastic material, and a substrate that detects the state of rotation of the rotor that is driven to rotate by the stator is electrically connected to the inverter by a flexible wiring material. A rotating electric machine characterized by being electrically connected. 6. The stator according to claim 5, wherein the stator includes a plurality of coils arranged on an arc excluding a part of a substantially circle, and the substrate is arranged on the removed arc. Rotating electric machine. A first detection element provided at a position for detecting when a phase has a specific electrical angle, and a position for detecting when a phase different from the phase has an electrical angle shifted by 90 ° from the specific electrical angle A rotating electric machine, comprising: a substrate having the second detection element provided on the substrate. The rotating electrical machine according to claim 7, wherein a logic of processing on a detection result detected by the second detection element is inverted with respect to a logic of processing on a detection result detected by the first detection element. 9. The rotating device according to claim 7, further comprising a stator having a plurality of coils arranged on an arc excluding a part of a substantially circle, wherein the substrate is arranged on the removed arc. Electric machine.

Images