JP5538660B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine for a vehicle integrated with a control device in which, for example, a motor unit and a control circuit unit are connected, and more particularly to a waterproof structure.

  As a conventional rotating electrical machine, for example, there is one shown in Japanese Patent Application Laid-Open No. 2011-97806, which is equipped with a rear bracket to which a brush holder is fixed and a rotational position detection sensor arranged on the rear end side of the rear bracket. A packing is arranged on the mating surface with the control device mounting case to improve waterproofness.

JP 2011-97806 A

  The conventional rotating electrical machine described above has a waterproof structure on the fitting surface between the rear bracket to which the brush holder is fixed and the control device mounting case portion on which the rotational position detection sensor arranged on the rear end side of the rear bracket is mounted. Since the packing or O-ring as described above was arranged, the number of parts was increased, leading to an increase in material cost and assembly cost. In addition, there has been a problem that the shape of the part such as a resin molded product is changed due to hydrolysis and oxidation due to aging, and the waterproofness of the fitting portion is impaired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating electrical machine having a highly reliable waterproof structure with a reduced number of parts.

A rotating electrical machine according to the present invention includes a bracket composed of a front bracket and a rear bracket coupled together, a rotating shaft rotatably supported by the bracket, a field winding and a field fixed to the rotating shaft. magnetic iron and sincerely made rotor, disposed around said rotor, a stator consisting of stator windings and stator core is fixed to the bracket, is arranged on the rear bracket side, the field winding a brush for supplying the field current, and a brush holder holding the brush, and the slinger which oppose each other through the rotating shaft and the brush, a cylindrical portion provided in the hollow portion of the rear bracket A rotor position detecting section that is disposed and has an insulator positioned between the rear bracket and the brush holder, and detects a rotational position of the rotor. Wherein the support, the first labyrinth-like engagement portion provided between the insulator and the Riyaburake' bets of the cylindrical portion of the rotor position detection sensor, and the insulator before Symbol rotor position detection sensor brushes includes a second labyrinth-like engagement portion provided between the holder and the third La Birinsu like engaging portion provided between the insulator and the slinger prior SL rotor position detection sensor It is a thing.

  According to the rotating electrical machine according to the present invention, it is possible to obtain a rotating electrical machine having a highly reliable waterproof structure with a reduced number of parts.

It is side surface sectional drawing which shows the rotary electric machine concerning Embodiment 1 of this invention. It is side surface sectional drawing which shows schematically the air path in the rotary electric machine concerning Embodiment 1 of this invention. It is side surface sectional drawing which shows the rotary electric machine concerning Embodiment 2 of this invention. It is a front view which shows the resolver in the rotary electric machine concerning Embodiment 2 of this invention. It is a front view which shows the resolver which has arrange | positioned the sensor cover in the rotary electric machine concerning Embodiment 2 of this invention. It is side surface sectional drawing which shows the resolver integrated with the insulator in the rotary electric machine concerning Embodiment 2 of this invention.

Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. 1 and FIG. 2, and in each of the drawings, the same or equivalent members and parts will be described with the same reference numerals. 1 is a side sectional view showing a rotary electric machine according to Embodiment 1 of the present invention. FIG. 2 is a side cross-sectional view schematically showing an air passage in the rotary electric machine according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the rotating electrical machine according to the first embodiment is fixed to a cylindrical stator 10 and a rotating shaft 7 constituted by a stator winding 11 a and a stator iron core 11 b. The rotor 8 that is rotated and configured by the field winding 9a and the field iron core 9b, and the front bearing 5, the rear bearing 6, and the stator 10 that support the rotating shaft 7 are held on both axial sides of the rotor 8. At the same time, a motor unit 1 constituted by a bracket made of an aluminum front bracket 3 and a rear bracket 2 which are integrally connected to hold the rotor 8 via a front bearing 5 and a rear bearing 6, and a current to the stator 10. A power circuit unit 21 composed of a DC / AC mutual conversion circuit 19 for supplying current and a field current switching circuit 20 for supplying field current to the rotor 8; A control circuit unit 22 including a control board 22a on which a control circuit for controlling the word circuit unit 21 is mounted, and a rotor position detection sensor 17 for detecting the rotation angle of the rotor 8; The rear is covered with a cover 23. The end of the rotary shaft 7 in the front axis direction of the front bearing 5 protrudes from the front bracket 3 and a pulley 18 is fixed.

On the rear side in the axial direction of the rear bracket 2, a field current connected to a DC / AC mutual conversion circuit 19 and a brush holder 14 for supplying phase-controlled three-phase AC power to the stator winding 11 a of the stator 10. A power circuit unit 21 having a switching circuit 20 and a control board 22a are disposed. The power circuit unit 21 is connected to the rotor 8 via a slip ring 12 covered with a brush 13 and a slinger 33 provided inside the brush holder 14. Electric power is supplied to the field winding 9a. The control board 22a controls the DC / AC mutual conversion circuit 19 for supplying phase-controlled three-phase AC power to the stator winding 11a of the controller-integrated dynamoelectric machine, and supplies power to the field winding 9a. For controlling the field current switching circuit 20 for the purpose. A sensor converter (not shown) that converts the detection signal of the rotor position detection sensor 17 into an angle signal is mounted on the control board 22a.

A cylindrical portion 4 extending in the axial direction is provided at the central portion of the rear bracket 2 in the axial direction rear end, a rear bearing 6 is provided in the cylindrical portion 4, and a rear side end portion of the rotating shaft 7 in the cylindrical portion 4 is provided. A sensor rotor 16 of a rotor position detection sensor 17 for detecting the rotation speed and rotation position of the rotor 8 is attached, and the rotary shaft 7 is attached to the rear bearing 6 so that the sensor rotor 16 is positioned inside the cylindrical portion 4 of the rear bracket 2. The rear end side is supported. The sensor stator 15 of the rotor position detection sensor 17 is directly fitted into the cylindrical portion 4 of the rear bracket 2 so that its inner peripheral surface faces the outer peripheral surface of the sensor rotor 16, and is electrically connected to the control circuit unit 22. Connected to. The output signal of the sensor stator 15 is supplied to a sensor converter (not shown) mounted on the control board 22a by a signal line, converted into an angle signal by the sensor converter, and this angle signal is converted into a DC / AC mutual conversion circuit 19. And a power circuit unit 21 that controls the field current switching circuit 20, and controls the current to the stator winding 11a and the field winding 9a by the DC / AC mutual conversion circuit 19 and the field current switching circuit 20 based on the angle signal. Is controlled via a connector (not shown), and control of the controller-integrated rotating electrical machine is executed.

The rotor position detection sensor 17 is disposed in the cylindrical portion 4 of the rear bracket 2 and is disposed coaxially with the rotation shaft 7 to detect the rotation position of the rotor 8. The rotor position detection sensor 17 includes a sensor stator 15 and a sensor rotor 16, and a sensor rotor 16 having only an iron core is rotatably provided inside the sensor stator 15. And has an insulator 31 that have a sensor terminal 3 2 positioned between the rear bracket 2 and the brush holder 14.

  Next, the control circuit unit 22 will be described. The control circuit unit 22 includes a power circuit unit 21 including a DC / AC mutual conversion circuit 19 that supplies a current to the stator 10, a field current switching circuit 20 that supplies a field current to the rotor 8, and a power circuit unit 21. A control board 22a mounted with a control circuit for controlling the power, a cooling heat sink 25 mounted with a power circuit unit 21 and a DC / AC mutual conversion circuit 19, a case 26 provided with a terminal 26a, a word circuit unit 21 and a DC AC And a control board 22a on which a control circuit for controlling the mutual conversion circuit 19 is configured.

  The power circuit unit 21 and the DC / AC mutual conversion circuit 19 are mounted on a lead frame for wiring, and the entire structure is resin-molded. After the control circuit unit 22 is assembled, the control circuit unit 22 is mounted on the rear side of the rear bracket 2. The brush holder 14 is disposed in a space through which the central rotation shaft 7 of the control circuit unit 22 passes, and the control circuit unit 22 is fixed to the motor unit 1. Thereafter, the protective cover 23 is mounted.

  Next, an electrical connection configuration of the lead wire 11a1 of the stator winding 11a of the stator 10 and the DC / AC mutual conversion circuit 19 of the control circuit unit 22 will be described. Between the rear bracket 2 and the control circuit part 22, the first connection part 27a connected to the lead wire 11a1 of the stator winding 11a and the control circuit part 22 are located on the outer peripheral side from the first connection part 27a. A connecting board 28 in which a terminal 27 having a second connection portion 27b connected to the terminal 26a of the case 26 is insert-molded is disposed. The terminal 26a of the case 26 is connected to the terminal 19a of the DC / AC mutual conversion circuit 19 by welding, for example.

  The connecting board 28 is fixed to the rear side of the rear bracket 2 with screws (not shown). The lead wire 11a1 of the stator winding 11a passes through the rear bracket 2 in the axial direction and is connected to the first connection portion 27a of the terminal 27 which is insert-molded on the connecting board 28 by, for example, welding.

  Thereafter, the control circuit portion 22 is assembled to the rear bracket 2, the second connection portion 27 b located on the outer peripheral side of the first connection portion 27 a of the terminal 27 insert-molded on the connecting board 28, and the case 26 of the control circuit portion 22. The terminal 26a formed by insert molding is fixed and electrically connected by, for example, a screw 29 and a nut 30. The terminal 26a insert-molded in the case 26 and the terminal 19a of the DC / AC mutual conversion circuit 19 are connected by, for example, welding.

The first labyrinth-like engaging portion is provided between the insulator 31 and the cylindrical portion 4 of the rear bracket 2 of the rotor position detection sensor 17, the insulator 31 and the brush holder 14 of the rotating rotor position detecting sensor 17 the second labyrinth-like engaging portion is provided between the third La Birinsu like engaging portion is provided between the insulator 31 and the slinger 33 times rotor position detecting sensor 17.

That is, the first la Birinsu like engaging portion that are disposed between the insulator 31 and the cylindrical portion 4 of the rear bracket 2 of the rotor position detection sensor 17, for example, a rotor position detecting sensor 17 is mounted a first concave Jogakarigo portion 34 provided on the end surface of the cylindrical portion 4 of the rear bracket 2, provided opposite portions of the cylindrical portion 4 of the rear bracket 2 of the insulator 31 of the rotor position sensor 17, It shows a case constituted by a first convex Jogakarigo portion 35 engaged with the first concave Jogakarigo portion 34.

The second La Birinsu like engaging portion that are disposed between the insulator 31 and the brush holder 14 of the rotor position detecting sensor 17, the sensor cover 36 is provided, for example, in the insulator 31 of the rotor position sensor 17 , a second recessed Jogakarigo portion 37 provided in the brush holder 14, provided on the opposite portion of the brush holder 14 of the sensor cover 36 provided to the insulator 31 of the rotor position detection sensor 17, the second It shows a case constituted by a second convex Jogakarigo portion 38 engaged with the recessed Jogakarigo portion 37.

The third La Birinsu like engaging portion that are disposed between the insulator 31 and the slinger 33 of the rotor position detection sensor 17, for example, a sensor cover 36 is provided on the insulator 31 of the rotor position sensor 17, a third concave Jogakarigo portion 39 provided on the slinger 33, provided on the opposite portion of the slinger 33 of the sensor cover 36 provided to the insulator 31 of the rotor position detecting sensor 17, third concave shaped engaging The case where it comprises the 3rd convex engagement part 40 engaged with the joint part 39 is shown.

Thus, the first labyrinth-like engaging portion between the insulator 31 and the cylindrical portion 4 of the rear bracket 2 of the rotor position detecting sensor 17 is provided, the insulator 31 times the rotor position detection sensor 17 and the brush holder 14 a second labyrinth-like engaging portion between the provided, by providing the third La Birinsu like engaging portion between the insulator 31 and the slinger 33 times the rotor position detection sensor 17, from the outside Prevents intrusion of liquids and foreign objects. Therefore, since packing, O-rings, and sealing agents are not required, the number of parts can be reduced, and material costs and processing costs can be reduced, and the rotating electrical machine can be downsized.

  In FIG. 2, the air path for cooling the brush holder 14, the heat sink 25, the stator 10, etc. of the rotating electrical machine is schematically shown as an air path A and an air path B, but unnecessary parts are reduced. As a result, it is possible to ensure a particularly large space for the air passage B and improve the cooling performance.

  Further, as the material of the parts constituting the labyrinth-like engaging portion, the material of the rear bracket 2 is made of an aluminum alloy as aluminum formed by casting, and the material of the insulator 31 of the rotor position detection sensor 17 is polybutylene. The insulator 31 is composed of terephthalate (PBT) or polyphenylene sulfide (PPS), and the insulator 31 having a low hardness of the rotor position detection sensor 17 is strongly pressed against an aluminum alloy having a high hardness of the rear bracket 2. By increasing the contact area due to bending or shaving, the waterproofness of the labyrinth-like engaging portion is improved.

  Further, the material of the brush holder 14 and the slinger 33 is made of polyphenylene sulfide (PPS), and both the slinger 33 and the insulator 31 are made of a resin having low hardness to form a contact surface with each other. And the waterproofness of the labyrinth-like engaging portion is improved.

Embodiment 2. FIG.
A second embodiment of the present invention will be described with reference to FIGS. 3 to 6. In each figure, the same or corresponding members and parts will be described with the same reference numerals. 3 is a side sectional view showing a rotary electric machine according to Embodiment 2 of the present invention. 4 is a front view showing a resolver in a rotary electric machine according to Embodiment 2 of the present invention. FIG. 5 is a front view showing a resolver in which a sensor cover is arranged in a rotary electric machine according to Embodiment 2 of the present invention. 6 is a side sectional view showing a resolver integrated with an insulator in a rotary electric machine according to Embodiment 2 of the present invention.

In the second embodiment, the case where the rotor position detection sensor mounted on the rotating electrical machine is the resolver 41 in particular is shown. As the resolver 41, thin silicon steel plates are laminated, and the formed resolver stator 42 is covered with an insulator 31 made of a resin material such as polybutylene terephthalate (PBT) or nylon (PA) and insulated from the sensor coil 45. The plurality of magnetic pole teeth 44 formed on the radially inner side of the resolver stator 42 fix the sensor coil 45, which is wound a plurality of times via the insulator 31, to the sensor terminal 32 in an integrated manner and are electrically connected. It is a structure to do.

  A resolver rotor 43 is provided on the central axis of the resolver stator 42 and is fixed to the shaft of the rotating electrical machine and rotates with the rotation of the shaft. The resolver rotor 43 has a salient pole shape in which the gap permeance changes sinusoidally with respect to the angle. A bush 46 is integrally formed in the insulator 31, and a groove is provided so as to cover the winding portion of the insulator 31. A sensor cover 36 formed of a resin material such as polybutylene terephthalate (PBT) or polyphenylene sulfide (PPS) is bonded to the insulator 31 via a silicon resin applied to the corresponding groove. Thereafter, the power circuit unit 21 is fastened with screws and integrated with the motor unit 1.

  In the second embodiment, the cylindrical portion 4 is provided on the axial end surface of the rear bracket 2, the rear bearing 6 is provided in the cylindrical portion 4, and the resolver rotor 43 attached to the rear end side of the rotary shaft 7 is the cylindrical portion 4. The rear end side of the rotating shaft 7 is supported by the rear bearing 6 so as to be located inside. The resolver stator 42 is directly fitted into the cylindrical portion 4 so that the inner peripheral surface thereof faces the outer peripheral surface of the resolver rotor 43 and is fixed by a fixing member (not shown).

First La Birinsu like engaging portion that are disposed between the insulator 31 and the cylindrical portion 4 of the rear bracket 2 of the resolver 41 as a rotor position detection sensor, for example, a rear bracket 2 that resolver 41 is mounted the first concave Jogakarigo portion 34 provided on the end surface of the cylindrical portion 4 provided on opposite portions of the cylindrical portion 4 of the rear bracket 2 in the insulator 31 of the resolver 41, the first concave Jogakarigo And a first convex engaging portion 35 engaged with the portion 34.

The second La Birinsu like engaging portion that are disposed between the insulator 31 and the brush holder 14 of the resolver 41, for example, a sensor cover 36 is provided on the insulator 31 of the resolver 41, provided in the brush holder 14 a second recessed Jogakarigo portion 37, provided on the opposite portion of the brush holder 14 of the sensor cover 36 provided to the insulator 31 of the resolver 41, engaged with the second concave Jogakarigo portion 37 first 2 convex engaging portions 38.

The third La Birinsu like engaging portion that are disposed between the insulator 31 and the slinger 33 of the resolver 41, for example, a sensor cover 36 is provided on the insulator 31 of the resolver 41, a third provided slinger 33 the concave Jogakarigo portion 39, provided on the opposite portion of the slinger 33 of the sensor cover 36 provided to the insulator 31 of the resolver 41, a third convex engaged with the third concave Jogakarigo 39 It is comprised by the shape engaging part 40. FIG.

Thus, the first labyrinth-like engaging portion between the insulator 31 and the cylindrical portion 4 of the rear bracket 2 of the resolver 41 is provided, the second labyrinth between the insulator 31 and the rear bracket 2 of the resolver 41 the Jo engaging portion provided, by providing the third La Birinsu like engaging portion between the insulator 31 and the slinger 33 of the resolver 41, it is prevented from entering the liquid or foreign matter from the outside. Therefore, since packing, O-rings, and sealing agents are not required, the number of parts can be reduced, and material costs and processing costs can be reduced, and the rotating electrical machine can be downsized.

Here, as shown in FIG. 5, the second convex engagement portion 38 provided on the rear side in the axial direction has been described with respect to the configuration provided in the sensor cover 36, but is not limited thereto. Instead, for example, as shown in FIG. When the insulator 31 and the sensor cover 36 having a labyrinth structure are provided separately, since there are no protrusions near the magnetic pole teeth 44 of the resolver 41, the path of the winding machine at the time of manufacture is simplified and the winding time is shortened. As a result, cost can be reduced. Also, it has the the insulator 31 is second convex Jogakarigo 38 If are integrated third convex Jogakarigo portion 40, reducing further improvement of assembling efficiency due to the number of components, further materials cost Reduction and further downsizing of the rotating electrical machine can be achieved.

  It should be noted that within the scope of the present invention, the embodiments can be freely combined, or the embodiments can be appropriately modified or omitted.

  The present invention is suitable for realizing a rotating electrical machine having a highly reliable waterproof structure with a reduced number of parts.

2 Rear bracket, 3 Front bracket, 4 Cylindrical part, 7 Rotating shaft, 8 Rotor, 9a Field winding, 9b Field core, 10 Stator, 11a Stator winding, 11b Stator core, 13 Brush, 14 Brush holder , 17 Rotor position detection sensor, 31 insulator, 33 slinger, 34 concave engagement portion, 35 convex engagement portion, 36 sensor cover, 37 concave engagement portion, 38 convex engagement portion, 39 concave engagement portion, 40 convex engagement part, 41 resolver.

Claims (11)

A bracket composed of a front bracket and a rear bracket coupled together, a rotating shaft rotatably supported by the bracket, a rotor fixed to the rotating shaft and composed of a field winding and a field core; A stator disposed around the rotor and fixed to the bracket and including a stator winding and a stator iron core, and a brush disposed on the rear bracket side for supplying a field current to the field winding A brush holder for holding the brush, a slinger disposed opposite to the brush via the rotation shaft, and a cylindrical portion provided in a hollow portion of the rear bracket, A rotor position detecting sensor having an insulator positioned between the brush holder and detecting a rotational position of the rotor; and the rotor position detecting sensor. A first labyrinth-like engagement portion provided between the insulator and the Riyaburake' bets of the cylindrical portion of the support, is provided between the insulator and the brush holder prior SL rotor position detection sensor rotary electric machine characterized by comprising a second labyrinth-like engaging portion, and a third La Birinsu like engaging portion provided between the insulator and the slinger prior SL rotor position detection sensor . The insulator and first La Birinsu like engaging portion SL before provided between the cylindrical portion of the Riyaburake' bets of the rotor position detection sensor, a provided on an end face of the cylindrical portion of the rear bracket 1 of the concave-shaped engagement portion, the first engaged with the said concave Jogakarigo unit phase provided on the counter portion before Symbol first the cylindrical portion of the rear bracket of the insulator of the rotor position detection sensor The rotating electrical machine according to claim 1, wherein the rotating electrical machine is configured with one convex engaging portion. The insulator and the second La Birinsu like engaging portion before SL provided between the brush holder of the rotor position detection sensor includes a second concave-shaped engagement portion provided in the brush holder, wherein that it is constituted by a second convex engagement portion that is engaged with the concave Jogakarigo unit phase provided on the counter portion before Symbol second of the brush holder of the insulator of the rotor position detection sensor The rotating electrical machine according to claim 1, wherein The insulator and the third La Birinsu like engaging portion SL before provided between the slinger of the rotor position detection sensor, a third concave-shaped engaging portion provided in said slinger, said rotor characterized in that it is constituted by a third convex engagement portion that is engaged with the concave Jogakarigo unit phase provided on the counter portion before Symbol third of the slinger of the insulator of the position detection sensor The rotating electrical machine according to claim 1 .   The rotation according to any one of claims 1 to 4, wherein the rear bracket is made of aluminum, and the insulator of the rotor position detection sensor is made of polybutylene terephthalate or polyphenylene sulfide. Electric.   The rotating electrical machine according to any one of claims 1 to 5, wherein the brush holder and the slinger are made of polyphenylene sulfide.   The rotating electrical machine according to claim 1, wherein the rotor position detection sensor is a resolver. The rotating electrical machine according to claim 3 wherein the second convex engagement portion, wherein the rotor position detecting sensor is arranged constituted Se Nsakaba resolver. The rotating electrical machine according to claim 4 wherein the third convex engaging portion, wherein the rotor position detecting sensor is arranged constituted Se Nsakaba resolver. Said second convex engaging section rotating electrical machine according to claim 3, wherein the rotor position detecting sensor is integrated with the insulator before Symbol resolver constituted by a resolver. The rotating electrical machine according to claim 4 wherein the third convex engaging portion, wherein the rotor position detecting sensor is integrated with the insulator before Symbol resolver constituted by a resolver.

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