WO2018135001A1 - Dynamo-electric machine - Google Patents

Abstract

The present invention is provided with: a stator; a rotor that rotates with respect to the stator; a resolver rotor that rotates together with the rotor; a resolver stator having a position detection coil group for measuring the rotational position of the resolver rotor; a first communication coil that is electrically connected to the position detection coil group of the resolver stator; a second communication coil with which signals from the first communication coil are conveyed by electromagnetic induction; and a partition unit that is not made of metal, provided between the first communication coil and the second communication coil. The second communication coil is spatially separated from the first communication coil by the partition unit.

Description

Rotating electric machine

This invention relates to a rotating electric machine having a resolver.

A resolver has a resolver rotor and a resolver stator and is a rotational position detection device that detects the rotational position of a rotating electrical machine, etc., and is known as a rotational position detection device that has high oil resistance and can be used in oil. Yes. Since oil such as bearing grease is used in the vicinity of the bearing of the rotating electrical machine, the resolver is disposed in the vicinity of the bearing. Furthermore, when the resolver is used in oil, the resolver cable connected to the resolver stator is a flexible body, so the oil leaks due to cable deflection or deformation, etc. There is a risk of adverse effects. Therefore, it is difficult to use the resolver without taking measures against oil leakage from the resolver cable.

In the apparatus described in Patent Document 1, the resolver is arranged via an oil seal portion with respect to a speed reduction unit that is an oil filling portion to the bearing. That is, as shown in FIG. 1 of Patent Document 1, the lubricating oil of the speed reduction unit is prevented from moving to the electric motor side by the partition wall and the oil seal, so that the electric motor side is kept dry. Therefore, the resolver on the electric motor side is configured not to contact oil.

JP 2012-184819 A

However, in the apparatus described in Patent Document 1, since the oil seal is provided between the input shaft that is a rotating body and the partition wall that is a fixed body, the input shaft is easily damaged by being rotated. It has become. Therefore, the oil seal is more expensive than an O-ring, which is a simple oil sealing member, because a member resistant to damage is used.

The present invention has been made to solve the above-described problems, and achieves both a resolver signal communication function and an oil sealing function of a rotating electrical machine having a resolver without using an expensive oil sealing member. It is.

In the rotating electrical machine according to the present invention, a stator, a rotor that rotates with respect to the stator, a resolver rotor that rotates together with the rotor, a resolver stator that includes a position detection coil group that measures the rotational position of the resolver rotor, A first communication coil electrically connected to the position detection coil group of the resolver stator; a second communication coil in which a signal from the first communication coil is transmitted by electromagnetic induction; and a first communication. A non-metallic partition provided between the communication coil and the second communication coil, and the second communication coil is spatially separated from the first communication coil by the partition. Yes.

According to the rotating electrical machine of the present invention, the wiring from the resolver stator to the first communication coil is provided by providing the non-metallic partition between the first communication coil and the second communication coil. And the wiring from the second communication coil to the control device can be spatially separated.

This makes it possible to maintain the resolver signal communication function and prevent oil leakage with an inexpensive structure such as an O-ring.

It is sectional drawing of the rotating shaft type rotary electric machine by Embodiment 1 of this invention. It is a schematic diagram which shows the electrical connection of the resolver in FIG. FIG. 3 is an exploded perspective view showing details of the periphery of a set of communication coils in FIG. 2. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3 and shows a state where an iron core is attached to the center of the communication coil. It is sectional drawing of the fixed-shaft type rotary electric machine by Embodiment 2 of this invention. It is a perspective view which shows the detail of 1 set of coils for communication in the rotary electric machine by Embodiment 3 of this invention. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. It is a perspective view which shows the detail of 1 set of coils for communication in the rotary electric machine by Embodiment 4 of this invention. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 8.

Hereinafter, an embodiment of a rotating electrical machine of the present invention will be described with reference to the drawings. In addition, in each figure, the same or an equivalent part is shown with the same code | symbol, and the overlapping description is abbreviate | omitted.

Embodiment 1 FIG.
1 is a cross-sectional view of a rotary shaft type rotating electrical machine according to Embodiment 1 of the present invention.

As shown in FIG. 1, the rotating shaft type rotating electrical machine 1 according to the first embodiment is configured in a housing 100 and includes a rotating electrical machine main body 20 and a resolver 10.

The rotating electrical machine body 20 includes a rotating shaft 101, a rotor 104 fixed to the rotating shaft 101, and a cylindrical stator disposed coaxially with the rotating shaft 101 and disposed outside the rotor 104. 105.

The rotating shaft 101 is rotatably supported via a pair of bearings 102 a and 102 b provided in the housing 100. The bearing 102b is provided on the resolver 10 side, and the bearing 102a is provided on the opposite side. Oil seals 103 are provided on the sides of the bearings 102a and 102b. Oil such as bearing grease is enclosed in a range surrounded by the bearing 102b and the partition portion 140 in order to make the rotation of the rotating shaft 101 smooth.

The rotor 104 rotates integrally with the rotation shaft 101 around the axis of the rotation shaft 101 with respect to the stator 105. The rotor 104 includes a columnar rotor core that is a magnetic body arranged coaxially with the rotation shaft 101, and a plurality of permanent magnets fixed to the rotor core.

The stator 105 is fixed to the inner peripheral surface of the housing 100. The stator 105 includes a cylindrical stator core that surrounds the outer periphery of the rotor 104, and a plurality of stator coils that are arranged in the circumferential direction of the stator core.

The resolver 10 includes a resolver rotor 111, a resolver stator 114, a first communication coil group 120, a partition 140, a second communication coil group 130, and a resolver cable 150.

The resolver rotor 111 is attached to one end of the rotating shaft 101. A resolver stator 114 is provided on the inner peripheral portion of the housing 100 so as to face the resolver rotor 111. The resolver stator 114 is connected to the first communication coil group 120. The first communication coil group 120 is provided on one side of a non-metallic partition 140 such as resin. On the other side of the partition 140, a second communication coil group 130 is provided so as to face the first communication coil group 120. The second communication coil group 130 is connected to one end of the resolver cable 150. The other end of the resolver cable 150 is connected to a control device (not shown) of the rotating electrical machine.

FIG. 2 is a diagram schematically showing the electrical connection of the resolver 10 of the rotating electrical machine 1 shown in FIG. As shown in FIG. 2, the resolver 10 has a resolver rotor 111 at the center and a circular resolver stator 114 at the outer periphery. The resolver stator 114 has a plurality of teeth. Windings are wound around the teeth, and a position detection coil group 112 is provided. The position detection coil group 112 has three position detection coil groups 112a, 112b and 112c. In the position detection coil group 112a, individual position detection coils wound for each tooth are electrically connected in series. The same applies to the position detection coil groups 112b and 112c. Of the three position detection coil groups 112a, 112b and 112c, one or two systems are used for excitation. In the first embodiment, the position detection coil group 112c is used for excitation.

The first communication coil group 120 includes first communication coils 120a, 120b, and 120c. The second communication coil group 130 includes second communication coils 130a, 130b, and 130c.

The position detection coil group 112a is electrically connected to the first communication coil 120a. A signal from the first communication coil 120a is transmitted to the second communication coil 130a by electromagnetic induction. A non-metallic partition 140 is provided between the first communication coil 120a and the second communication coil 130a. That is, the second communication coil 130a is spatially separated from the first communication coil 120a by the partition 140. Similarly, the position detection coil group 112b is electrically connected to the first communication coil 120b, and a partition portion is provided between the first communication coil 120b and the second communication coil 130b. 140 is provided. The same applies to the position detection coil group 112c, the first communication coil 120c, and the second communication coil 130c.

The portion where the second communication coil 130a is provided facing the first communication coil 120a by the partition 140 is defined as a position P1, and details of the position P1 will be described with reference to FIG. FIG. 3 is an exploded perspective view of two communication coils and a partition part.

As shown in FIG. 3, the partition 140 has a circular through hole 141. A columnar iron core 160 is provided through the through-hole portion 141 in the vertical direction.

A first communication coil 120a is provided on the upper side of the partition 140. The first communication coil 120a includes a cylindrical insulator 121 having flange portions at both upper and lower ends, and a communication coil winding 122 is wound around the outer periphery of the cylindrical portion sandwiched between the flange portions. Yes. The insulator 121 is provided with a through-hole portion 123 in the vertical direction so that it can be attached to the iron core 160.

In addition, a second communication coil 130a is provided below the partition 140. Similarly, the second communication coil 130a has a cylindrical insulator 131 having flange portions at both upper and lower ends, and a communication coil winding 132 is wound around the outer periphery of the cylindrical portion sandwiched between the flange portions. It is. The insulator 131 is provided with a through-hole portion 133 in the vertical direction so that it can be attached to the iron core 160.

Here, the iron core 160 constitutes a first iron core portion included in the first communication coil 120a and a second iron core portion included in the second communication coil 130a. Further, the iron core 160 constitutes an iron core portion in which the first iron core portion and the second iron core portion are integrally formed.

FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. As shown in FIG. 4, an iron core 160 is inserted into and fixed to the partition 140 in the through hole 141. The first communication coil 120a is mounted and fixed on the upper surface of the partition portion 140 so as to have an iron core 160 therein. The second communication coil 130a is attached and fixed to the lower surface of the partition portion 140 so as to have the iron core 160 therein.

Below, the effect | action of the rotary electric machine 1 by Embodiment 1 is demonstrated using FIG. 2 and FIG.
In FIG. 2, in the position detection coil groups 112a, 112b and 112c, a magnetic circuit is excited with an alternating voltage by one or two excitation coil groups.
In the first embodiment, a variable reluctance type resolver with one-phase excitation and two-phase output will be described.

The position detection coil group 112a is configured by electrically connecting position detection coils wound around each tooth portion in series. The gap between the resolver rotor 111 and the tooth portion of the resolver stator 114 differs depending on the teeth. When the magnetic circuit is excited by the position detection coil group 112c, a magnetic circuit having a different magnetic flux is formed on each tooth. Since the excitation voltage is an AC voltage, the magnetic flux periodically changes and the magnetic flux penetrating the teeth changes, so that a voltage is generated in each position detection coil by electromagnetic induction. The position detection coil group 112a outputs the sum of the voltages generated in the position detection coils.

Further, when the magnetic circuit is excited by the position detection coil group 112c, when the resolver rotor 111 rotates together with the rotor 104, the gap between the resolver rotor 111 and each tooth constituting the position detection coil group 112a changes. However, the magnetic flux changes in the magnetic circuit due to the change in magnetic permeability. The magnetic permeability and magnetic flux in the magnetic path change periodically depending on the rotation angle of the resolver rotor 111. That is, the rotation angle of the resolver rotor 111 can be measured as a change in the output voltage of the position detection coil group 112a due to a change in the magnetic flux in the magnetic path. The same applies to the position detection coil group 112b.

The position detection coil groups 112a, 112b, and 112c function as an output coil that detects the position of the resolver rotor 111 and outputs a signal of the detected rotational position. Therefore, the rotational position of the resolver rotor 111 can be detected by reading the output voltages from the position detection coil groups 112a, 112b and 112c as output signals.

The output signal from the position detection coil group 112a is transmitted to the first communication coil 120a. The output signal is transmitted from the first communication coil 120a to the second communication coil 130a by electromagnetic induction. The signal is transmitted to the resolver cable 150 (see FIG. 1), and is transmitted to the controller of the rotating electrical machine. Similarly, an output signal from the position detection coil group 112b is transmitted in the order of the first communication coil 120b, the second communication coil 130b, and the resolver cable 150, and is transmitted to the controller of the rotating electrical machine. The same applies to the output signal from the position detection coil group 112c.

As shown in FIG. 4, the second communication coil 130a is spatially separated from the first communication coil 120a by a non-metallic partition 140. Therefore, the resolver cable 150 connected to the second communication coil 130 a does not come into contact with the oil sealed in the range surrounded by the bearing 102 b and the partition portion 140.

As described above, in the rotating electrical machine 1 according to the first embodiment, the non-metallic partition part 140 is provided between the first communication coil 120a and the second communication coil 130a, so that The wiring from the first communication coil 120a and the wiring from the second communication coil 130a to the control device can be spatially separated.

This makes it possible to maintain the resolver signal communication function and prevent oil leakage with an inexpensive structure such as an O-ring.

Note that electromagnetic induction is used when a signal is transmitted from the first communication coil 120a to the second communication coil 130a. By using a non-metallic material for the partition portion 140, eddy current loss due to magnetic flux generated in the partition portion 140 can be prevented.

In addition, by attaching the iron core 160 to the through hole 141, the partition 140 positions the second communication coil 130a with respect to the first communication coil 120a. As a result, magnetic flux leakage due to a shift between the center position of the first communication coil 120a and the center position of the second communication coil 130a is reduced. Specifically, magnetic flux leakage due to the shift of the center position in a direction perpendicular to the central axis of the iron core, that is, a so-called horizontal direction is reduced.

In addition, since the first communication coil 120a and the second communication coil 130a have the integrally formed iron core 160, magnetic flux leakage due to the gap between the iron cores of the two communication coils is reduced. Is done.

Note that a member for sealing oil may be provided in the through-hole portion 141 of the partition portion 140. A packing such as an O-ring may be used for this member, or a resin may be molded. Thereby, the sealing property of oil can further be improved.

In the first embodiment, the permanent magnet synchronous motor is used. However, the present invention can also be applied to other motors such as an induction motor and a DC motor.

The resolver 10 uses a 9 × 12 slot inner rotor type, but any combination of shaft angle multiplier, number of slots, and inner rotor type or outer rotor type is within the range of functioning as a resolver. It may be adopted. Furthermore, although the resolver 10 uses a variable reluctance type resolver with one-phase excitation and two-phase output, it may be a two-phase excitation and one-phase output resolver or a rotary transformer type resolver.

Embodiment 2
Next, a rotating electrical machine according to Embodiment 2 will be described with reference to FIG. In the first embodiment, the present invention is applied to a rotating shaft type rotating electric machine, but the second embodiment is applied to a fixed shaft type rotating electric machine.

As shown in FIG. 5, the housing 200 is provided with a stator 205 on the outer peripheral side. A rotor 204 having a U-shaped cross section is provided outside the housing 200, and a permanent magnet (not shown) is provided at a location facing the stator 205. A bearing 202 and an oil seal 203 are provided adjacent to each other on the outer periphery of the cylindrical portion 200 a close to the central axis of the housing 200. The bearing 202 rotatably supports the rotation support portion 204a of the rotor 204.

A resolver rotor 211 is provided on the inner periphery of the rotation support portion 204a of the rotor 204. A non-metallic partition 140 is provided at the end of the cylindrical portion 200 a of the housing 200. In the partition part 140, a resolver stator 214 is provided inside the housing 200 so as to face the resolver rotor 211.

A first communication coil group 120 is provided on the center side of the resolver stator 214. A second communication coil group 130 is provided on the opposite side of the first communication coil group 120 with the partition portion 140 interposed therebetween. The second communication coil group 130 is connected to one end of the resolver cable 150. The other end of the resolver cable 150 is connected to a control device (not shown) of the rotating electrical machine.

As described above, in the rotating electrical machine 2 according to the second embodiment, the resolver stator 114 is provided by providing the non-metallic partition 140 between the first communication coil group 120 and the second communication coil group 130. To the first communication coil group 120 and the wiring from the second communication coil group 130 to the control device can be spatially separated.

Thus, the oil sealing mechanism that prevents oil such as bearing grease from leaking into the resolver cable can have a simple configuration.

Embodiment 3 FIG.
Next, a rotating electrical machine according to Embodiment 3 will be described with reference to FIGS. 6 and 7. In the first embodiment, the iron core of the first communication coil and the iron core of the second communication coil are integrally formed. However, in the third embodiment, the iron core of the first communication coil and the second iron core of the first communication coil are integrally formed. The cores of the communication coils are formed separately, and the communication coil positioning method is different.

FIG. 6 is a perspective view showing details of the periphery of a set of communication coils in the rotating electrical machine according to the third embodiment. FIG. 7 is a sectional view taken along line VII-VII in FIG.

As shown in FIG. 6, the first communication coil 320 is provided on the upper surface of a substantially flat non-metallic partition 340. The first communication coil 320 is provided by winding a winding 322 around a cylindrical first iron core 361.

On the other hand, the second communication coil 330 is provided on the lower surface of the partition portion 340. The second communication coil 330 is provided by winding a winding 332 around a cylindrical second iron core 362. The first iron core 361 constitutes a first iron core portion, and the second iron core 362 constitutes a second iron core portion.

As shown in FIG. 7, the partition part 340 has a first truncated cone-shaped projection 340a on the first communication coil 320 side. The first iron core 361 has a columnar first recess 361a. The first concave portion 361a is attached and fixed to the first convex portion 340a.

Further, the partition part 340 has a truncated cone-shaped second convex part 340b on the second communication coil 330 side. The second iron core 362 has a cylindrical second recess 362a. The second concave portion 362a is mounted and fixed to the second convex portion 340b.

As described above, in the rotating electrical machine according to the third embodiment, the first recess 361a is attached to the first protrusion 340a, and the second recess 362a is attached to the second protrusion 340b, thereby separating the partition portion. 340 positions the second communication coil 330 with respect to the first communication coil 320. Thereby, the leakage of magnetic flux due to the horizontal shift between the center position of the first communication coil 320 and the center position of the second communication coil 330 is reduced.

Further, since the first iron core 361 and the second iron core 362 are formed separately, it is possible to reduce the leakage magnetic flux due to the iron core.

Embodiment 4 FIG.
Next, a rotating electrical machine according to Embodiment 4 will be described. In the fourth embodiment, the positioning method is different from that in the third embodiment, and the second communication coil is positioned by mounting the iron core in the recess provided in the partition portion.

FIG. 8 is a perspective view showing details of the periphery of a set of communication coils in the rotating electrical machine according to the fourth embodiment. FIG. 9 is a sectional view taken along line IX-IX in FIG.

As shown in FIG. 8, the first communication coil 420 is provided on the upper surface of a substantially flat non-metallic partition portion 440. The first communication coil 420 is provided by winding a winding 422 around a cylindrical first iron core 461.

On the other hand, the second communication coil 430 is provided on the lower surface of the partition portion 440. The second communication coil 430 is provided by winding a winding 432 around a cylindrical second iron core 462. The first iron core 461 constitutes a first iron core portion, and the second iron core 462 constitutes a second iron core portion.

As shown in FIG. 9, the partition part 440 has a circular first recess 440a on the first communication coil 420 side. A first iron core 461 is attached and fixed to the first recess 440a. Moreover, the partition part 440 has the circular 2nd recessed part 440b in the 2nd coil 430 for communication. A second iron core 462 is attached and fixed to the second recess 440b. The first communication coil 420 is positioned by fitting the inner peripheral portion of the recess 440a and the outer peripheral portion of the iron core 461 together. The same applies to the positioning of the second communication coil 430.

Thus, in the rotating electrical machine according to the fourth embodiment, the first iron core 461 is attached to the first recess 440a, and the second iron core 462 is attached to the second recess 440b. The second communication coil 430 is positioned with respect to the first communication coil 420. Thereby, the leakage of magnetic flux due to the horizontal shift between the center position of the first communication coil 420 and the center position of the second communication coil 430 is reduced.

Further, since the first iron core 461 and the second iron core 462 are formed separately, leakage flux due to the iron core can be reduced.

Note that the first communication coil 420 is positioned by fitting, but may be fixed by screws or bonded.

Also, when the horizontal position of the first iron core 461 is shifted in the first recess 440a, the voltage phase and amplitude fluctuate, but the positioning function for transmitting magnetic flux is not impaired. The same applies to the second iron core 462.

Here, in the first to fourth embodiments, the number of turns of the second communication coil is the same as the number of turns of the first communication coil. Thereby, the voltage communicated between the first communication coil and the second communication coil can be made the same.

As a modification in the first to fourth embodiments, the number of turns of the second communication coil may be different from the number of turns of the first communication coil. In electromagnetic induction, the amplitude of the output voltage changes depending on the winding ratio. For example, by making the number of turns of the second communication coil larger than the number of turns of the first communication coil, the voltage generated in the second communication coil is made larger than when the number of turns is the same. Can do. Also, by making the number of turns of the first communication coil connected to the excitation coil larger than the number of turns of the second communication coil, the excitation voltage can be made larger than when the number of turns is the same. it can. As a result, it is possible to reduce the output voltage due to the leakage of magnetic flux or to improve the transformation ratio of the resolver.

104, 204 rotor, 105, 205 stator, 111, 211 resolver rotor, 112a, 112b, 112c position detection coil group, 114, 214 resolver stator, 120a, 120b, 120c, 320, 420 first communication coil 122, 322, 422, winding of the first communication coil, 130a, 130b, 130c, 330, 430, second communication coil, 132, 332, 432, winding of the second communication coil, 140, 340 , 440 partitioning part, 141 through hole part, 160 iron core (first iron core part, second iron core part, core part formed integrally), 340a first convex part, 340b second convex part, 361 , 461 First iron core (first iron core), 361a First recess, 362, 462 Second iron core (second iron Parts), 362a second recess, 440a first recess, 440b second recess.

Claims (8)

A stator,
A rotor that rotates relative to the stator;
A resolver rotor that rotates with the rotor;
A resolver stator having a position detection coil group for measuring the rotational position of the resolver rotor;
A first communication coil electrically connected to the position detection coil group of the resolver stator;
A second communication coil in which a signal from the first communication coil is transmitted by electromagnetic induction;
A non-metallic partition provided between the first communication coil and the second communication coil;
A rotating electrical machine in which the second communication coil is spatially separated from the first communication coil by the partition portion. The rotating electrical machine according to claim 1, wherein the partition portion positions the second communication coil with respect to the first communication coil. The first communication coil has a first iron core,
The second communication coil has a second iron core;
The first iron core part and the second iron core part are integrally formed,
The partition has a through hole,
The rotating electrical machine according to claim 2, wherein the positioning is performed by mounting the integrally formed iron core portion in the through-hole portion. The first communication coil has a first iron core,
The second communication coil has a second iron core;
The first iron core and the second iron core are each formed separately,
The first iron core has a first recess on the side facing the partition,
The second iron core has a second recess on the side facing the partition,
The partition has a first protrusion on the first communication coil side,
The partition has a second protrusion on the second communication coil side,
The partition is
The first recess is mounted on the first protrusion;
The rotating electrical machine according to claim 2, wherein the positioning is performed by mounting the second concave portion on the second convex portion. The first communication coil has a first iron core,
The second communication coil has a second iron core;
The first iron core and the second iron core are each formed separately,
The partition has a first recess on the first communication coil side,
The partition has a second recess on the second communication coil side,
The partition is
The first iron core is mounted in the first recess;
The rotating electrical machine according to claim 2, wherein the positioning is performed by mounting the second iron core portion in the second recess. The first communication coil has a first iron core,
The second communication coil has a second iron core;
The rotating electrical machine according to claim 1, wherein the first iron core portion and the second iron core portion are integrally formed. The first communication coil has a first iron core,
The second communication coil has a second iron core;
The rotating electrical machine according to claim 1, wherein the first iron core portion and the second iron core portion are separately formed. The rotating electrical machine according to any one of claims 1 to 7, wherein the number of turns of the second communication coil is different from the number of turns of the first communication coil.

Images