JP6651269B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electric machine having a resolver.

  The resolver has a resolver rotor and a resolver stator, and is a rotation position detection device that detects a rotation position of a rotating electric machine or the like, and is known as a rotation position detection device having high oil resistance and having no problem even when used in oil. I have. Since oil such as bearing grease is used in the vicinity of the bearing of the rotating electric machine, the resolver is arranged near the bearing. Furthermore, when the resolver is used in oil, the resolver cable connected to the resolver stator is a flexible body, so that oil leaks out due to flexing or deformation of the cable, 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 device described in Patent Literature 1, the resolver is arranged via an oil seal portion with respect to a speed reduction unit that is an oil filling portion for the bearing. That is, as shown in FIG. 1 of Patent Document 1, the lubricating oil of the reduction gear 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 the oil.

JP 2012-184819 A

  However, in the device described in Patent Literature 1, since the oil seal is provided between the input shaft that is the rotating body and the partition that is the fixed body, the oil shaft is easily damaged by rotation of the input shaft. Has become. Therefore, since the oil seal uses a member that is resistant to damage, it is more expensive than an O-ring that is a simple oil sealing member.

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

In the rotating electric machine according to the present invention, a stator, a rotor that rotates with respect to the stator, a resolver rotor that rotates with the rotor, and a resolver stator that has 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 to which a signal from the first communication coil is transmitted by electromagnetic induction, and a first communication coil A non-metal partition provided between the communication coil and the second communication coil, wherein the second communication coil is spatially separated from the first communication coil by the partition , The first communication coil has a first iron core, the second communication coil has a second iron core, and the first iron core and the second iron core are integrally formed. I have.

  According to the rotating electric machine of the present invention, the wiring from the resolver stator to the first communication coil is provided by providing the non-metal 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.

  As a result, the communication function of the resolver signal can be maintained, and oil leakage can be prevented by an inexpensive structure such as an O-ring.

FIG. 1 is a cross-sectional view of a rotating shaft type rotating electric machine according to Embodiment 1 of the present invention. FIG. 2 is a schematic diagram illustrating electrical connection of the resolver in FIG. 1. FIG. 3 is an exploded perspective view showing details around a set of communication coils in FIG. 2. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, showing a state where an iron core is mounted at the center of a communication coil. FIG. 7 is a cross-sectional view of a fixed-shaft type rotating electric machine according to Embodiment 2 of the present invention. FIG. 13 is a perspective view showing details around a set of communication coils in a rotary electric machine according to Embodiment 3 of the present invention; FIG. 7 is a sectional view taken along line VII-VII in FIG. 6. FIG. 15 is a perspective view showing details around a set of communication coils in a rotary electric machine according to Embodiment 4 of the present invention. FIG. 9 is a sectional view taken along line IX-IX in FIG. 8.

  Hereinafter, embodiments of a rotating electric machine according to the present invention will be described with reference to the drawings. In each of the drawings, the same or corresponding parts are denoted by the same reference numerals, and redundant description will be omitted.

Embodiment 1 FIG.
FIG. 1 is a sectional view of a rotating shaft type rotating electric machine according to Embodiment 1 of the present invention.

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

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

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

  The rotor 104 rotates integrally with the stator 105 about the axis of the rotation shaft 101 with respect to the stator 105. Further, the rotor 104 has a columnar rotor core, which is a magnetic material, and is 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. Further, the stator 105 has a cylindrical stator core surrounding the outer periphery of the rotor 104, and a plurality of stator coils provided side by side 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 of the partition portions 140 made of nonmetal 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 electric machine.

  FIG. 2 is a diagram schematically showing the electrical connection of the resolver 10 of the rotating electric 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. A winding is 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 has first communication coils 120a, 120b, and 120c. Further, the second communication coil group 130 has second communication coils 130a, 130b, and 130c.

  The position detection coil group 112a is electrically connected to the first communication coil 120a. The 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 section is provided between the first communication coil 120b and the second communication coil 130b. 140 are provided. The same applies to the position detection coil group 112c, the first communication coil 120c, and the second communication coil 130c.

  A portion where the second communication coil 130a is provided to face the first communication coil 120a by the partition 140 is referred to as a position P1, and the 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.

  As shown in FIG. 3, the partition 140 has a circular through hole 141. A columnar iron core 160 is provided to penetrate the through hole 141 up and down.

  Above the partition 140, a first communication coil 120a is provided. The first communication coil 120a has a cylindrical insulator 121 having flange portions at 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. I have. The insulator 121 is provided with a through hole 123 in a vertical direction so that the insulator 121 can be attached to the iron core 160.

  A second communication coil 130a is provided below the partition 140. Similarly, the second communication coil 130a also includes 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. Have been. The insulator 131 is provided with a through-hole 133 in a vertical direction so that the insulator 131 can be attached to the iron core 160.

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

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

The operation of the rotating electric machine 1 according to the first embodiment will be described below with reference to FIGS.
In FIG. 2, in the position detection coil groups 112a, 112b, and 112c, the magnetic circuit is excited by an AC voltage by one or two excitation coil groups.
In the first embodiment, a variable reluctance resolver having one-phase excitation and two-phase output will be described.

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

  In a state where 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. Then, as the magnetic permeability changes, the magnetic flux of the magnetic circuit changes. The magnetic permeability and the 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 by the 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 also function as output coils that detect the position of the resolver rotor 111 and output 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.

  An 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 transmitted to the control device of the rotating electric 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 control device of the rotating electric 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 nonmetallic partitioning part 140. Therefore, the resolver cable 150 connected to the second communication coil 130a does not come into contact with the oil sealed in the area surrounded by the bearing 102b and the partition 140.

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

  As a result, the communication function of the resolver signal can be maintained, and oil leakage can be prevented by an inexpensive structure such as an O-ring.

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

  Further, by mounting the iron core 160 in the through-hole 141, the partitioning part 140 positions the second communication coil 130a with respect to the first communication coil 120a. Thereby, the leakage of the magnetic flux due to the difference between the center position of the first communication coil 120a and the center position of the second communication coil 130a is reduced. Specifically, the leakage of the magnetic flux due to the shift of the center position in the direction perpendicular to the center axis of the iron core, that is, in the so-called horizontal direction is reduced.

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

  In addition, a member for sealing oil may be provided in the through hole 141 of the partition 140. For this member, packing such as an O-ring may be used, or resin may be molded. Thereby, the hermeticity of the oil can be further improved.

  Although the permanent magnet synchronous motor is used in the first embodiment, the present invention can 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. However, regarding the double shaft angle, the number of slots, and whether the inner rotor type or the outer rotor type, any combination is possible within a range that functions as a resolver. May be adopted. Further, the resolver 10 uses a variable reluctance resolver with one-phase excitation and two-phase output, but may be a resolver with two-phase excitation and one-phase output or a rotary transformer type resolver.

Embodiment 2
Next, a rotating electric machine according to a second embodiment 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 position facing the stator 205. A bearing 202 and an oil seal 203 are provided adjacent to the outer periphery of the cylindrical portion 200a near the center 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 partitioning part 140 is provided at an end of the cylindrical part 200 a of the housing 200. In the partition section 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 section 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 electric machine.

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

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

Embodiment 3 FIG.
Next, a rotating electric machine according to a third embodiment will be described with reference to FIGS. In the first embodiment, the iron core of the first communication coil and the iron core of the second communication coil are formed integrally, but in the third embodiment, the iron core of the first communication coil and the second core of the second communication coil are formed. Are formed separately from each other, and the method of positioning the communication coil is different.

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

  As shown in FIG. 6, the first communication coil 320 is provided on the upper surface of a substantially flat nonmetallic partition 340. The first communication coil 320 is provided by winding a coil 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 340. The second communication coil 330 is provided with a winding 332 wound around a cylindrical second iron core 362. The first iron core 361 constitutes a first iron core, and the second iron core 362 constitutes a second iron core.

  As shown in FIG. 7, the partition section 340 has a frustum-shaped first protrusion 340 a on the first communication coil 320 side. The first iron core 361 has a columnar first concave portion 361a. The first concave portion 361a is mounted on and fixed to the first convex portion 340a.

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

  As described above, in the rotating electric machine according to the third embodiment, first partition 361a is attached to first projection 340a, and second recess 362a is attached to second projection 340b. 340 positions the second communication coil 330 with respect to the first communication coil 320. Thereby, the leakage of the magnetic flux due to the horizontal displacement 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 from each other, it is possible to reduce the magnetic flux leakage due to the iron core.

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

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

  As shown in FIG. 8, the first communication coil 420 is provided on the upper surface of a substantially flat nonmetallic partition 440. The first communication coil 420 is provided with a winding 422 wound 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 440. The second communication coil 430 is provided with a winding 432 wound around a cylindrical second iron core 462. The first iron core 461 constitutes a first iron core, and the second iron core 462 constitutes a second iron core.

  As shown in FIG. 9, the partition section 440 has a circular first concave section 440 a on the first communication coil 420 side. The first core 461 is mounted and fixed to the first recess 440a. Moreover, the partition part 440 has a circular second concave part 440 b on the second communication coil 430 side. The second core 462 is mounted and fixed to the second recess 440b. The positioning of the first communication coil 420 is performed by fitting an inner peripheral portion of the concave portion 440a and an outer peripheral portion of the iron core 461. The same applies to the positioning of the second communication coil 430.

  As described above, in the rotating electric machine according to Embodiment 4, first partition 440 is attached to first core 461 in first recess 440a, and second core 462 is attached to second recess 440b. , The second communication coil 430 is positioned with respect to the first communication coil 420. This reduces the leakage of magnetic flux due to the horizontal displacement between the center position of the first communication coil 420 and the center position of the second communication coil 430.

  In addition, since the first iron core 461 and the second iron core 462 are separately formed, it is possible to reduce the leakage magnetic flux due to the iron core.

  In addition, although the positioning of the first communication coil 420 is performed by fitting, fixing by screws or bonding may be used.

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

  Here, in Embodiments 1 to 4, 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 equalized.

  As a modification of the first to fourth embodiments, the number of turns of the winding of the second communication coil may be different from the number of turns of the winding of the first communication coil. In electromagnetic induction, the amplitude of the output voltage changes depending on the turns 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 be. By making the number of turns of the first communication coil connected to the exciting coil larger than the number of turns of the second communication coil, the exciting voltage can be made larger than when the number of turns is the same. it can. This makes it possible to reduce the output voltage due to the leakage of the magnetic flux or to improve the transformer transformation ratio.

104, 204 Rotor, 105, 205 Stator, 111, 211 Resolver rotor, 112a, 112b, 112c Position detecting coil group, 114, 214 Resolver stator, 120a, 120b, 120c, 320, 420 First communication coil , 122, 322, 422 First communication coil winding, 130a, 130b, 130c, 330, 430 Second communication coil, 132, 332, 432 Second communication coil winding, 140, 340 , 440 partition part, 141 through-hole part, 160 core (first core part, second core part, integrally formed core part), 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 core), 36 2a second concave portion, 440a first concave portion, 440b second concave portion.

Claims (4)

A stator,
A rotor that rotates with respect to the stator,
A resolver rotor that rotates with the rotor,
A resolver stator having a position detection coil group for measuring a 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 to 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;
The second communication coil is spatially separated from the first communication coil by the partition ,
The first communication coil has a first iron core,
The second communication coil has a second iron core,
A rotating electric machine wherein the first core portion and the second core portion are integrally formed . The partition has a through hole,
  The partition unit positions the second communication coil with respect to the first communication coil by attaching the integrally formed iron core to the through hole. 2. The rotating electric machine according to 1. A stator,
A rotor that rotates with respect to the stator,
A resolver rotor that rotates with the rotor,
A resolver stator having a position detection coil group for measuring a 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 to 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;
The second communication coil is spatially separated from the first communication coil by the partition ,
The first communication coil has a first iron core,
The second communication coil has a second iron core,
The first core portion and the second core portion are separately formed,
The first core portion has a first concave portion on a side facing the partition portion,
The second core portion has a second concave portion on a side facing the partition portion,
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 first recess is mounted on the first projection,
When the second concave portion is attached to the second convex portion,
The rotating electric machine , wherein the partition unit positions the second communication coil with respect to the first communication coil . The rotating electrical machine according to any one of claims 1 to 3 , wherein the number of turns of the winding of the second communication coil is different from the number of turns of the winding of the first communication coil.

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