JP2006352979A - Rotating electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of part items, to reduce the number of part assembling man-hours, and to improve the assembling accuracy of a rotating shaft of a rotor, in a rotating electric machine. <P>SOLUTION: In the rotating electric machine 10, a housing 11 and a yoke 12 are integrally formed, a small assembly 200A is formed wherein a resolver stator 32 and a bearing 17 are assembled to a resolver holder 200, and the resolver holder 200 is mounted to the housing 11. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine.

As a rotating electrical machine, as described in Patent Document 1, it has a housing and a cylindrical yoke, a cylindrical stator is accommodated in the yoke, a rotor is arranged in the cylinder of the stator, and the rotation shaft of the rotor is A bearing provided on the yoke, a resolver rotor portion that is supported on the bearing provided on the housing side and is attached to the rotor side, and a resolver stator portion that is disposed so as to surround the resolver rotor portion and is attached to the stator side The motor lead wire connected to the motor coil wound around the stator and the sensor lead wire connected to the resolver stator portion are connected from the housing to the outside. There is something that makes it possible.
JP2004-157056

The rotating electric machine of Patent Document 1 has the following problems.
(1) The rotating electrical machine has a housing, a yoke, an O-ring sandwiched between the housing and the yoke, a screw that fastens the housing and the yoke, a bearing that is inserted and crimped into the housing, a resolver stator portion that is inserted into the housing, Each component such as a plate for holding the resolver stator portion against the housing and screws for fixing the plate to the housing are assembled in order. Accordingly, the number of parts is large and the number of parts assembling steps is also increased.

  (2) Although both ends of the rotating shaft of the rotor are supported by a bearing provided on the yoke and a bearing provided on the housing, the housing and the yoke are separated. It is difficult to make it coaxial, and the assembly accuracy of the rotor rotation shaft is poor.

  An object of the present invention is to reduce the number of parts, reduce the number of parts assembling steps, and improve the assembling accuracy of a rotating shaft of a rotor in a rotating electrical machine.

  The invention of claim 1 has a housing and a cylindrical yoke, a cylindrical stator is accommodated in the yoke, a rotor is disposed in the cylinder of the stator, and a rotation shaft of the rotor is provided on the yoke. And a resolver rotor portion attached to the rotor side and supported by a bearing provided on the housing side, and a resolver stator portion disposed so as to surround the resolver rotor portion and attached to the stator side, A rotating electrical machine having a resolver for detecting the rotational position of a rotor, and capable of connecting a motor lead wire connected to a motor coil wound around a stator and a sensor lead wire connected to a resolver stator portion from the housing to the outside The housing and the yoke are integrally formed to form a small assembly in which the resolver stator portion and the bearing are assembled to the resolver holder in advance. It is those attached to the housing.

  According to a second aspect of the present invention, in addition to the first aspect of the invention, the resolver holder is press-fitted and held in a housing.

(Claim 1)
(a) A yoke housing body in which the housing and the yoke are integrally molded is formed, and a small assembly in which the resolver stator portion and the bearing are assembled in advance to the resolver holder is formed, and the resolver holder constituting the small assembly is formed on the yoke housing body. Mounted on the housing. Since the assembly parts of the rotating electrical machine are made into two parts, a yoke housing body and a small assembly (resolver holder, resolver stator part and bearing), the number of parts can be reduced, and the number of parts assembly man-hours can be reduced.

(Claim 2)
(b) A resolver holder is press-fitted into a housing integrated with the yoke as a yoke housing body, and both ends of the rotor rotating shaft are supported by the bearing on the yoke side and the bearing on the resolver holder side. The coaxial accuracy of the bearing on the resolver holder side and the bearing on the yoke side can be improved, and the assembly accuracy of the rotor rotating shaft can be improved.

  1 is a sectional view showing a motor, FIG. 2 is a front view of FIG. 1, FIG. 3 is a rear view of FIG. 1, FIG. 4 is a sectional view showing a bobbin of a stator, and FIG. FIG. 6 is a cross-sectional view showing a modified example of the motor.

  A DC brushless motor 10 as a rotating electrical machine of the present invention includes a housing 11 and a cylindrical yoke 12 as shown in FIGS. 1 to 3, and a cylindrical stator 13 is accommodated in the yoke 12. The rotor 14 is disposed therein, and the rotating shaft 15 of the rotor 14 is rotatably supported by a bearing 16 provided at the closed end of the yoke 12 and a bearing 17 provided on the housing 11 side.

  The stator 13 is formed by arranging a plurality of, for example, twelve cores 21 fitted on the inner periphery of the yoke 12 on the circumference. Each core 21 is formed by laminating silicon steel plates, and a resin bobbin 22 is attached thereto. The stator 13 winds each motor coil 23 having three phases of U phase, V phase, and W phase around the coil winding portion 22 </ b> A of each bobbin 22.

  As shown in FIG. 4, each of the coils 23 forming the U phase, the V phase, and the W phase is connected to each of the three bus rings A to C, and the common side of each coil 23 is connected to the neutral bus ring D. Each coil 23 is star-connected.

  Each bus ring A to D is held by each of the ring holding portions 24A to 24D provided on the bobbin 22. Each bus ring A to D forms a flat plate ring as shown in FIG. Each of the bus rings A to D has a short circumferential shape or a C shape with a slit in a part of the circumferential direction.

  The bobbin 22 has a protruding portion 22B protruding from the coil winding portion 22A, and the ring holding portions 24A to 24D are provided at four positions along the protruding direction of the inner surface of the protruding portion 22B.

  Of the four ring holding portions 24A to 24D provided on the inner surface of the protruding portion 22B of the bobbin 22, the neutral bus ring D is held by the ring holding portion 24D closest to the coil winding portion 22A. In the present embodiment, a ring holding portion 24D, a ring holding portion 24A, a ring holding portion 24B, and a ring holding portion 24C are provided in order from the coil winding portion 22A side of the inner surface of the protruding portion 22B in the protruding direction.

  In the present embodiment, the inner surface of the protruding portion 22B of the bobbin 22 is formed into a gradient surface that expands in the protruding direction, and the groove-shaped ring holding portions 24A to 24D are respectively provided at four positions along the gradient direction of the gradient surface. Provide. Therefore, the inner surfaces of the protrusions 22B provided on the bobbins 22 of the cores 21 fitted on the inner periphery of the yoke 12 form a conical surface. At this time, the ring holding portions 24A to 24D provided on the inner surface of each protrusion 22B form an annular groove, and the groove diameters of the annular grooves formed by the ring holding portions 24A to 24D are different from each other. . In this embodiment, the groove diameter increases in the order of the ring holding part 24D, the ring holding part 24A, the ring holding part 24B, and the ring holding part 24C, and the neutral bus ring D, bus ring A, bus ring B, and bus ring corresponding to them. C also increases the outer diameter in order. Each bus ring D, A, B, C is inserted in order from the outside of the sloped surface of the protruding portion 22B in order from the small-diameter neutral bus ring D, and is supported by itself and / or elastic expansion / contraction deformation of the bobbin 22 The ring holding portions 24D, 24A, 24B, and 24C are held in a diameter-expanded state after being dropped and arranged in parallel to each other.

  Each bus ring A to C is connected to each of the U-phase, V-phase, and W-phase coils 23 via coil connection terminals 23A to 23C, and the neutral bus ring D is connected to the common side of each coil 23 via a common terminal 23D. Connected to. Since the bus rings A to D are arranged in parallel in the above-described order along the protruding direction of the protruding portion 22B of the bobbin 22, the common terminal 23D of each coil 23 is in the flat plate of the innermost neutral bus ring D. Directly connected, the U-phase coil connection terminal 23A penetrates the through hole provided in the neutral bus ring D in an insulated state and is connected to the inside of the plate of the bus ring A, and the V-phase coil connection terminal 23B is connected to the bus ring D, The through-hole provided in A is penetrated in an insulated state and connected to the flat plate of the bus ring B, and the W-phase coil connection terminal 23C penetrates the through-hole provided in the bus rings D, A and B in an insulated state. It is connected in the flat plate of the bus ring C.

  A U-phase, V-phase, and W-phase external connection terminal 25 is connected to each of the bus rings A to C. On the other hand, U-phase, V-phase, and W-phase motor lead wires 27 extending to an external control circuit are inserted into the grommet 26 attached to the housing 11. The external connection terminals 25 and motor lead wires 27 corresponding to each other are connected by three connection portions 28 provided in the housing 11.

  The rotor 14 is attached with a magnet 29 that generates a magnetic field on the rotating shaft 15 made of a magnetic material such as iron by bonding or the like, and a holding tube (not shown) is attached to the outer surface of the magnet 29.

  The motor 10 includes a resolver 30 including a resolver rotor portion 31 and a resolver stator portion 32. That is, a resolver rotor portion 31 that rotates together with the rotor 14 is attached to the outer periphery of the rotor 14 on the output end side of the rotating shaft 15. A resolver stator portion 32 is attached to the inner periphery of the stator 13 side, in other words, the housing 11 side. The resolver stator unit 32 is disposed so as to surround the resolver rotor unit 31, and detects the rotational position of the rotor 14 by a change in reluctance generated between the resolver stator unit 32 and the resolver rotor unit 31. In accordance with the detected rotational position of the rotor 14, a predetermined pattern of current is supplied to the U-phase, V-phase, and W-phase coils 23 by an external control circuit to drive the motor 10.

  The resolver stator portion 32 is provided with a male connector 33A. A female connector 33B to which a sensor lead wire 34 is connected is connected to the male connector 33A. The sensor lead wire 34 extends from the grommet 26 attached to the housing 11 to an external control circuit.

However, the motor 10 has the following configuration in order to reduce the number of parts.
As shown in FIG. 5, the motor 10 is a yoke housing body 100 in which a housing 11 and a yoke 12 are integrally formed. The yoke housing body 100 is made of a cup-shaped formed body of an iron plate, and a stator 13 press-fitted into the yoke 12 is fitted from one end opening 101 of the yoke housing body 100 (housing 11).

  As shown in FIG. 5, the motor 10 includes a resolver holder 200 attached to the yoke housing body 100 (housing 11). A small assembly 200 </ b> A is formed in which the bearing 17 and the resolver stator portion 32 are inserted and caulked into the resolver holder 200 in advance. The resolver holder 200 may be formed by press fitting or insert molding the bearing 17 and the resolver stator portion 32 in advance to form a small assembly 200A.

Therefore, the assembly procedure of the motor 10 is as follows.
(1) The stator 13 is press-fitted into the yoke 12 of the yoke housing body 100, and the motor lead wire 27 connected to the core 21 of the stator 13 is extended from the housing 11 of the yoke housing body 100 to the outside.

  (2) The subassembly 200A is formed by assembling the bearing 17 and the resolver stator portion 32 to the resolver holder 200.

  (3) The resolver holder 200 is attached to the housing 11 of the yoke housing body 100. A sensor lead wire 34 connected to the resolver stator portion 32 is extended from the housing 11 of the yoke housing body 100 to the outside. The resolver holder 200 is press fitted into the one end opening 101 of the yoke housing body 100 and attached.

According to the present embodiment, the following operational effects can be obtained.
(a) The housing 11 and the yoke 12 are integrally formed into a yoke housing body 100, and a small assembly 200A in which the resolver stator portion 32 and the bearing 17 are assembled in advance to the resolver holder 200 is formed to constitute the small assembly 200A. The resolver holder 200 was attached to the housing 11 of the yoke housing body 100. Since the assembly parts of the motor 10 are made into two parts, the yoke housing body 100 and the small assembly 200A (resolver holder 200, resolver stator portion 32, and bearing 17), the number of parts can be reduced and the number of parts assembly can be reduced. .

  (b) The resolver holder 200 is press-fitted into the housing 11 integrated with the yoke 12 as the yoke housing body 100, and both ends of the rotating shaft 15 of the rotor 14 are connected by the bearing 16 on the yoke 12 side and the bearing 17 on the resolver holder 200 side. To support. The coaxial accuracy of the bearing 17 on the resolver holder 200 side and the bearing 16 on the yoke 12 side can be improved, and the assembly accuracy of the rotating shaft 15 of the rotor 14 can be improved.

In addition, according to a present Example, there exist the following effects.
(a) Since each bus ring A to D is held in each of the ring holding portions 24A to 24D provided on the bobbin 22, a separate bus ring holder from the bobbin 22 is not required, the number of parts is reduced, and the part set Man-hours can be reduced. The bobbins 22 themselves hold the bus rings A to D, and can be downsized.

  (b) Since each of the bus rings A to D is a flat ring, the shape of the bus ring can be simplified and the parts workability can be improved.

  (c) By providing the ring holding portions 24A to 24D at four positions along the protruding direction of the inner surface of the protruding portion 22B of the bobbin 22, each flat-shaped bus ring held by each of the ring holding portions 24A to 24D A to D can be arranged in an orderly manner.

  (d) The inner surface of the protruding portion 22B of the bobbin 22 forms a gradient surface that expands in the protruding direction, and the ring holding portions 24A to 24D are provided at four positions along the gradient direction of the gradient surface. Accordingly, the outer diameters of the respective bus rings A to D are made different from each other, and the bus rings A to D can be positioned and held in the corresponding ring holding portions in order from the smaller diameter bus rings to the inside of the inclined surface. The assembly | attachment property of ~ D can be improved.

  (e) The neutral bus ring D to which the common side terminal 23D of each coil 23 is connected is connected to the coil winding portion 22A among the four ring holding portions 24A to 24D provided on the inner surface of the protruding portion 22B of the bobbin 22. It was held in the nearest ring holding part 24D. Therefore, it is not necessary to pass through the numerous common terminals 23D of the coils 23 connected to the neutral bus ring D to the other bus rings A to C, and the assemblability of the bus rings A to D can be improved.

  The motor 10 in FIG. 6 is different from the motor 10 in FIG. 1 in the connection structure of the motor lead wire 41 and the sensor lead wire 42. The female connector 41A is connected to the U-phase, V-phase, and W-phase external connection terminals 25 connected to the bus rings A to C. The female connector 42A is connected to the resolver stator portion 32. The female connectors 41 </ b> A and 42 </ b> A are juxtaposed toward the external connection port 11 </ b> A of the housing 11. The coupler 40 fixed to the yoke housing body 100 (housing 11) includes a motor lead wire 41 and a sensor lead wire 42, and these lead wires 41 and 42 are inserted into the external connection port 11A of the housing 11 to form a female. The connectors 41A and 42A are inserted and the lead wires 41 and 42 can be extended to an external control circuit. If the male connector is formed by connecting the lead wires 41 and 42 with a plate-like connection conductor integral with the external connection terminal portion in the coupler 40, the lead wire is used when the coupler 40 is assembled in the external connection port 11 A of the housing 11. 41 and 42 can be easily inserted into the female connectors 41A and 42A, respectively.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

FIG. 1 is a sectional view showing a motor. FIG. 2 is a front view of FIG. FIG. 3 is a rear view of FIG. FIG. 4 is a sectional view showing a bobbin of the stator. FIG. 5 is a cross-sectional view showing the assembly process of the motor. FIG. 6 is a cross-sectional view showing a modified example of the motor.

Explanation of symbols

10 Motor (Rotating electric machine)
11 Housing 12 Yoke 13 Stator 14 Rotor 15 Rotating shaft 16, 17 Bearing 23 Motor coil 27 Motor lead wire 30 Resolver 31 Resolver rotor portion 32 Resolver stator portion 34 Sensor lead wire 100 Yoke housing body 200 Resolver holder 200A Small assembly

Claims (2)

Having a housing and a cylindrical yoke,
A cylindrical stator is housed in a yoke, a rotor is disposed in the cylinder of the stator, and the rotating shaft of the rotor is supported by a bearing provided on the yoke and a bearing provided on the housing side,
A resolver rotor portion attached to the rotor side, and a resolver stator portion arranged to surround the resolver rotor portion and attached to the stator side, and having a resolver for detecting the rotational position of the rotor,
In a rotating electrical machine that allows a motor lead wire connected to a motor coil wound around a stator and a sensor lead wire connected to a resolver stator portion to be connected from the housing to the outside,
The housing and the yoke are integrally molded,
Forming a small assembly in which the resolver stator part and the bearing are assembled in advance to the resolver holder,
A rotating electric machine comprising a resolver holder attached to a housing.   The rotating electrical machine according to claim 1, wherein the resolver holder is press-fitted and held in a housing.

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