JP2000152545A - Dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the space factor of the coil for an electric machine and to shorten wiring between the coil and a controller. SOLUTION: End members 20 are arranged on both ends of a stator core 10. Almost straight slot in-slot conductors 16 are arranged in slots 14 of the stator core 10. Coil end conductors 28 which bridge the in-slot conductors 16 are arranged in the end members 20. Control elements 30 are installed integrally in the end members 20. Since the in-slot conductors 16 are almost straight, they can easily be inserted into the slots 14, and the space factor is also improved. A coil is formed by connecting the end members 20 to the stator core 10, and a controller is integrated with an electric machine. Thus, the wiring of the coil and the control elements 30 becomes short and electromagnetic noise and a copper loss, which are generated from it, can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine such as a motor or a generator, and more particularly to a structure thereof.

[0002]

2. Description of the Related Art In a rotating electric machine such as an electric motor or a generator, in order to obtain a high output, an increase in a current flowing through a coil and an increase in the number of turns of the coil are performed. If this is simply performed, the size of the rotating electric machine will be increased. In order to obtain a small, high-output rotating electrical machine, the ratio of the cross-sectional area of the conductor in the slot to the cross-sectional area of the slot, which is the portion in which the coil conductor fits, between the magnetic poles of the core, the so-called space factor, is improved. Required. A proposal on a method of improving the space factor is described in Japanese Patent Application Laid-Open No. 55-122440.

In the above-mentioned publication, a coil conductor is divided into an inside of a slot and a coil end, and after a conductor is arranged in a slot, a conductor in the slot is bridged by a conductor in a coil end portion to form a coil. Has been completed. The conducting wire arranged inside the slot can be formed into a rod shape in advance according to the shape of the inside of the slot, and can be inserted from the core axial direction. This achieves an improvement in the space factor.

[0004]

However, in the above-mentioned publication, the coil is easily formed while improving the space factor, but wiring for connecting the coil and the control circuit of the rotating electric machine is required. is there. This wiring has a problem that it becomes a source of electromagnetic noise and copper loss. Further, after the coil is formed, there is a problem that man-hours for connection are required and the man-hour is increased.

An object of the present invention is to provide a rotating electric machine which achieves a high space factor, reduces copper loss, suppresses noise generation, and requires a small number of manufacturing steps.

[0006]

In order to solve the above-mentioned problems, a rotating electric machine according to the present invention has a core and a cross section having a general shape substantially equal to the cross section of the core, and is disposed at both ends of the core. End member, and disposed in the slot of the core, an in-slot conductor whose both ends protrude from the core end, and disposed in the end member, electrically connected to the predetermined in-slot conductor, It has a coil end conductor that bridges these and forms a coil with the in-slot conductor, and a control unit that is arranged integrally with the end member and controls the current that flows through the coil.

[0007] Since the control unit is arranged integrally with the end member,
Wiring connecting the coil and the control unit can be eliminated or shortened. As a result, the amount of noise generation and copper loss can be reduced. Further, the cost for the material of the wiring can be reduced.

Further, a tube through which a cooling medium passes can be arranged in the end member. According to this, the control unit and the core can be cooled.

According to another aspect of the present invention, there is provided a method of manufacturing a rotating electric machine, comprising the steps of: arranging, in a slot of a core, an in-slot conductor having both ends projecting from the core end; Arranging a coil end wire that contacts the in-slot wire and forms a coil by bridging the wire inside the end member having the same general cross section; and passing a current flowing through the coil to the end member. A step of integrally arranging a control unit to be controlled, and a step of connecting the end member to a core end so that a predetermined coil end conductor and a predetermined in-slot conductor are connected.

[0010] Since the control section is integrally arranged on the end member, the work of connecting the coil and the control section is eliminated, and the number of steps can be reduced.

[0011]

Embodiments of the present invention (hereinafter referred to as embodiments) will be described below with reference to the drawings. FIG. 1 is an exploded perspective view of the electric motor according to the present embodiment.
The stator core 10 is formed by punching a magnetic steel sheet into a core cross-sectional shape and laminating the core. Stator core 10
Has a cross-sectional shape in which an annular portion and convex portions serving as the magnetic poles 12 inside the annular portion are arranged in the circumferential direction. The recess between the magnetic poles 12 is a slot 14. As for the conductors arranged in the slots, the conductors 16 arranged in one slot are bundled (conductor bundle 18). The conductor bundle 18 is formed by bundling conductors having a substantially straight line and a rectangular cross section.
It protrudes from the end face of the stator core 10. The protruding lengths are different, and the details will be described later.

End members 2 are provided at both ends of the stator core 10.
0 is placed. The end member 20 includes the stator core 10
A concave portion 22 is provided corresponding to the conductive wire bundle 18 protruding from the end of the conductive wire 16. In the concave portion 22, a contact 24 is arranged corresponding to each of the conductive wires 16. A coil end conductor 28 (see FIG. 2) that bridges the conductor 16 in one slot and the conductor 16 in another slot is disposed inside the end member 20. Both ends of the coil end conductor 28 serve as the contacts 24 described above. The coil is formed by the coil end conductor 28 and the conductor 16 in the slot. A plurality of control elements 30 such as power transistors are dispersedly arranged on at least one surface of the end member 20 opposite to the stator core 10. The control element 30 controls the current flowing through the coil.

FIG. 2 shows a developed cross section of a cylindrical surface around the axis of the stator at the end of the stator.
An in-slot conductor 16 is disposed in the slot 14, and the tip of the wire 16 protrudes more toward the center of the slot 14. The leading end of the conductive wire 16 is formed with a slope. The right side from the center of the slot is a rightward slope, and the left side is a leftward slope. This slope is a conductor 16 sandwiching the magnetic pole 12.
And the corresponding conductors 16 are connected by a coil end conductor 28. This connects the conductors to form a coil that is wound around the magnetic pole. The conductors 16 at both ends of the coil project from the surface of the end member 20 on which the control element 30 is provided, and are connected to the control element 30.

FIG. 3 shows a cross section of a plane including the axis of the stator. As shown in the drawing, a cooling pipe 32 is provided in a substantially circumferential direction at a portion of the end member 20 where the coil end conductor 28 is not arranged, that is, at a position corresponding to a portion further outside the magnetic pole 12 of the stator core. . Water or a full lizard flows through the cooling pipe 32 to absorb heat of the control element 30 such as a power transistor and the motor body and take it out of the motor.

When this electric motor is manufactured, first, a punched electromagnetic steel sheet is laminated, and a stator core 10 is manufactured. In addition, the conductors 16 processed into a predetermined length and a predetermined end shape are bundled to produce a conductor bundle 18. Then, the conductor bundle 18 is inserted into the slot 14 in the axial direction of the stator core 10. On the other hand, the coil end conductor 28 is arranged in the end member 20 and the control element 30 is arranged. This end member 20 is connected to the end of the stator core 10 into which the conductive wire bundle 18 is inserted. At this time, the stator core 10 and the end member 20 are relatively vibrated, and the in-slot conductor 16
And the coil end conductor 28 are rubbed together and welded by frictional heat.

Since the wire bundle 18 can be inserted substantially linearly into the slot, a high space factor can be achieved with a simple operation. In addition, the control element 3 is attached to the end member 20.
Since the 0 is formed integrally, the wiring connecting the coil and the control device including the control element is very short. This allows
Electromagnetic noise generated from this portion can be reduced. Further, the copper loss of the motor generated in this portion is also reduced. Further, material costs can be reduced.

In the above embodiment, the case where the outer of the motor is a stator is described. However, also in the case where the inner is a stator, similarly, the conductor in the slot and the conductor of the coil end portion are separated and later. They can be joined. Furthermore, not only for electric motors,
The same can be applied to the generator.

The in-slot conductor 16 and the coil conductor 2
Joining with the welding member 8 is not limited to friction welding, and a joining method such as brazing in a vacuum furnace can be adopted.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a stator of an electric motor according to an embodiment.

FIG. 2 is an exploded cross-sectional view of the stator according to the present embodiment with respect to a cylindrical surface around the stator shaft.

FIG. 3 is a cross-sectional view of a plane including a stator shaft of the stator of the present embodiment.

[Explanation of symbols]

10 stator cores, 12 magnetic poles, 14 slots, 1
6 conductor (in-slot conductor), 18 conductor bundle, 20 end member, 28 coil end conductor, 30 control element, 3
2 Cooling piping.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Junwa Shamoto 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation F-term (reference) 5H603 AA03 AA09 BB12 CA01 CA05 CB02 CB03 CB11 CB18 CC05 CC11 CC17 CD02 CD22 CE05 CE13 EE01 5H604 AA05 AA08 BB14 CC01 CC05 CC15 QB12

Claims (3)

[Claims] 1. A core, an end member having a cross section having a general shape substantially equal to a cross section of the core, disposed at both ends of the core, and disposed in slots of the core, both ends protruding from the core end. An in-slot conductor, a coil end conductor disposed in the end member, electrically connected to the predetermined in-slot conductor, bridging them, and forming a coil with the in-slot conductor; A control unit that is arranged integrally with the component member and controls a current flowing through the coil. 2. The rotating electric machine according to claim 1, wherein the end member is provided with a pipe through which a cooling medium passes. 3. A step of arranging an in-slot conductor having both ends protruding from a core end in a slot of the core; A step of arranging a coil end conductor that contacts a conductor and bridges them to form a coil; a step of integrally arranging a control unit that controls a current flowing through the coil in the end member; Coupling the end member to a core end portion such that the end conductor and the predetermined in-slot conductor are connected to each other.