JPH09308169A - Electric motor - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To relate to an electric motor, more specifically, to prevent a defect in connection between a terminal of a winding and a terminal, and comply with an internal wiring standard of a device. SOLUTION: Substantially I-shaped tooth portions are provided at equal intervals from a yoke portion 2 of a stator iron core 1, and substantially U-shaped portions symmetrical to both sides from every other base end of the substantially I-shaped tooth portions. A tooth portion of the mold is provided, an inner groove and an outer groove are formed on the inner side and the outer side of the tooth portion, respectively, and insert molding 7 is performed with resin to cover the stator core, and the outer groove and the inner groove on the connection side are formed. A terminal 10 having an intermediate wall therebetween, an inner partition wall at an inner peripheral portion, and a hook portion 10a sandwiching an end of the winding 8a along the symmetrical tooth portion is provided between the outer peripheral portion and the intermediate wall. By forming a terminal strut 7d3, 7d1, 7d2 provided at the tip and corresponding to the hook portion, a resistance welding machine using a movable electrode provided with a protruding portion having substantially the same length as the thickness of the hook portion of the terminal and Resistance welding is performed on the terminal A '.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor, and more particularly, to connection of winding terminals and terminals.

[0002]

2. Description of the Related Art Conventionally, the winding of a stator core in an inner winding type motor in which a winding is wound directly from the inside of a stator core to a tooth portion has been performed by a three-nozzle winding machine. FIG. 6 shows an example of the winding state of the stator according to the winding method in this case on the connection side of the stator of a 24-slot 6-pole motor.

As in FIG. 1, the tooth portions of the stator core 1 to the yoke portion 2 of the substantially I-shape 3 are provided at equal intervals. By providing symmetrical U-shaped teeth 4 and substantially inverted U-shaped tooth portions 5 on both sides from every other base end of the substantially I-shaped tooth portions, the substantially U-shaped and substantially inverted U-shaped tooth portions are provided. The inner groove 6a, the outer groove 6b, and the inner groove 6 are provided on the inner side and the outer side of the tooth portion, respectively.
c, the outer groove 6d is formed, and the stator iron core 1 of 24 slots is formed.

Here, as in FIG. 2, at least the tips of the tooth portions facing the rotor are removed, and the stator core is insert-molded with resin to cover the stator core, and the outer groove and inner groove on the connection side are formed. An intermediate wall 7c in between, an inner partition wall 7b in the inner peripheral portion,
As shown in FIG. 5, between the outer peripheral portion and the intermediate wall, along the substantially inverted U-shaped, substantially U-shaped tooth portion, the terminal provided with a terminal for winding connection at its tip, Center and left terminal support 7d3,
7d1 and 7d2 are integrally projected.

Then, the outer winding 8a is wound between the outer groove and the next outer groove. Similarly, for other grooves, 8b, 8
c is wound to form an outer winding. Then, the terminals AA ′, BB ′, CC ′ of the outer winding are led out from the connection side along the guide path of the insert molding. Here, the outer winding 8a will be described. As shown in FIG. 6, the hook portion 10a for sandwiching and connecting the terminal is welded and fixed by a resistance welding machine. FIG. 7 shows a state in which the hook portion 10a of the terminal 10 is sandwiched between the fixed electrode 12 and the movable electrode 11 of the resistance welding machine and resistance welding is performed.

Next, the inner winding 9d is wound between the inner groove and the next inner groove. Similarly, 9e for other grooves,
The inner winding is formed by winding 9f. Then, the terminals DD ′, EE ′, FF ′ of the inner winding are led out from the connection side along the guide path of the insert molding, and are sandwiched by the hook portions of the terminals of the terminal columns and resistance welded.

[0007] In this way, the terminals are connected to the printed circuit board to constitute a stator of a motor having 24 slots and 6 poles.

In this case, since only the hook portion is welded while the terminal A'is led out from the hook portion for sandwiching and connecting the terminal, the terminal is not fixed and does not comply with the internal wiring standard of the equipment. There is a possibility that it will be a problem.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art. It prevents a defective connection between a winding terminal and a terminal of an electric motor, and complies with the internal wiring standard of the equipment to improve reliability. It is an object of the present invention to provide an electric motor having improved productivity as well as improved productivity.

[0010]

In order to achieve the above object, tooth portions are provided from a yoke portion of a stator core, grooves are formed between the tooth portions, and the teeth face at least the rotor. Except for the tip of the part, the stator core is covered with a resin, and a plurality of terminal stanchions provided with terminals having hooks formed by cutting and raising and bending are provided at the tip, and the winding is connected to the groove from the groove. In the electric motor, which is wound between the grooves of, the ends of those windings are sandwiched between the hook portions, and the hook portions are resistance welded by a resistance welding machine using a movable electrode and a fixed electrode,
The ends of the windings led out from the hooks are resistance-welded.

Then, the terminal columns are insert-molded to be integrally formed.

Alternatively, an insulator in which the terminal support is formed to form a winding guide path is provided, and the insulator is mounted in the groove.

Further, the movable electrode is provided with a protruding portion having a length corresponding to the thickness of the hook portion.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Tooth portions are provided from a yoke portion of a stator core, grooves are formed between the tooth portions, and at least the tips of the tooth portions facing the rotor are removed, and the fixing is performed by resin. A plurality of terminal stanchions each having a terminal having a hook portion formed by cutting and raising after bending the child iron core are provided, and a winding is wound between the groove and the next groove. In a motor in which the end of the winding wire is sandwiched between the hook portions and the hook portion is resistance welded by a resistance welding machine using a movable electrode and a fixed electrode, the end of the winding wire derived from the hook portion is resistance welded. So that

Then, the defective connection of the winding terminals of the electric motor is prevented, the internal wiring standard of the equipment is complied with, and the reliability is improved.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the accompanying drawings. The same reference numerals are used for the same parts as in the conventional example. Embodiments of the present invention will be described in detail with reference to the accompanying drawings with respect to a 24-slot 6-pole electric motor.

FIG. 1 is a plan view of a stator core. The tooth portions of the substantially I-shaped 3 are provided at equal intervals from the yoke portion 2 of the stator core 1. By providing symmetrical U-shaped teeth 4 and substantially inverted U-shaped tooth portions 5 on both sides from every other base end of the substantially I-shaped tooth portions, the substantially U-shaped and substantially inverted U-shaped tooth portions are provided. Inner grooves 6 on the inside and outside of the teeth, respectively
a, the outer groove 6b, the inner groove 6c, and the outer groove 6d are formed.
The stator core 1 of the slot is formed.

FIG. 2 is a plan view showing a winding state of the stator in the winding system in this case, where one side of the stator is the connection side. Here, at least the tips of the tooth portions facing the rotor are removed, and insert molding 7 is performed with a resin to cover the stator core, and an intermediate wall 7c is provided between the outer groove and the inner groove on the connection side. The inner partition wall 7b is provided in the peripheral portion, and the hook portion 1 is formed by cutting and raising and then bending it between the outer peripheral portion and the intermediate wall along the substantially inverted U-shaped and substantially U-shaped tooth portions.
The right, center, and left terminal columns 7d3, 7d1, and 7d2 having the terminal 10 having 0a at the tip thereof are formed.

Here, the outer winding 8a is wound between the outer groove 6d and the next outer groove 6b. Furthermore, it is wound between the outer groove adjacent to the outer groove and the next outer groove. Similarly, each nozzle is wound around each groove by using another nozzle to form each outer winding 8b, 8c. And the terminal A of the outer winding
A ', BB', and CC 'are led out from the connection side along the guide path of the insert molding.

Then, as shown in FIG. 3, the outer winding 8a
The hook portion 10a of the terminal 10 and the end A'of the outer winding are resistance-welded.

Here, as shown in FIG. 4 and FIG. 5 corresponding to the XX ′ section, a movable electrode corresponding to the hook portion and provided with a protruding portion 11a having a length h substantially the same as the thickness t thereof. 11, the hook portion and the terminal A ′ are sandwiched between the movable electrode and the fixed electrode 12, and the hook portion and the terminal are simultaneously resistance welded by a resistance welding machine.

Next, the inner winding 9d is wound between the inner groove 6a and the next inner groove 6c. Similarly, each nozzle is wound around another groove by using another nozzle, and each inner winding 9e,
9f is formed. And, the inner winding terminal DD ',
EE 'and FF' are led out from the connection side along the guide path of the insert molding, and the hook portion and the ends of their windings are resistance welded at the same time by a resistance welding machine. In this way, a stator having 24 slots and 6 poles is formed.

Here, a resistance welding machine using a movable electrode, in which a hook portion and an end of the terminal are resistance-welded and a protruding portion corresponding to the hook portion and having a length substantially the same as the thickness of the hook of the terminal is provided. The effect of resistance welding will be described below. In the case of the present invention, since the hook portion of the terminal and the terminal are resistance-welded, the terminal does not move and it is possible to comply with the internal wiring standard of the device. Further, since resistance welding is performed by a resistance welding machine using a movable electrode provided with a protruding portion having substantially the same height as the thickness of the hook portion, it is possible to adjust the step difference between the hook portion and the terminal at two resistances at the same time. Welding is possible. As a result, it is possible to prevent a defect in the connection between the winding terminal and the terminal of the electric motor, improve the reliability in compliance with the internal wiring standard of the device, and provide the electric motor with improved productivity. In the present invention, the terminal support column 7d3,
An insulator (not shown in the figure for the same shape as the insert molding portion 7) having 7d1 and 7d2 is provided, and the hook portion and the terminal are resistance-welded at the same time by mounting the insulator in the groove. Resistance welding may be performed by a machine.

[0024]

As described above, in the present invention, teeth are provided from the yoke portion of the stator core, grooves are formed between the teeth, and at least the tips of the teeth facing the rotor are provided. Except for, the stator core is covered with a resin, a plurality of terminal stanchions provided with terminals having hook portions formed by cutting and raising and then bending are provided, and windings are provided from the groove to the next groove. In the electric motor, which is wound between the ends of the windings, is sandwiched between the hook portions, and the hook portions are resistance-welded by a resistance welding machine using a movable electrode and a fixed electrode. The end of the wire was made by resistance welding.

As a result, it is possible to prevent a defective connection between the winding terminal and the terminal of the electric motor, improve the reliability in conformity with the internal wiring standard of the device, and improve the productivity.

[Brief description of drawings]

FIG. 1 is a plan view of a stator core of a motor of the present invention.

FIG. 2 is a plan view of an embodiment showing a connection side of a stator of the electric motor according to the present invention.

FIG. 3 is a main part plan view showing a connection state between a winding terminal and a terminal of the electric motor of the present invention.

FIG. 4 is a cross-sectional view of an essential part showing a winding terminal and a terminal of a motor of the present invention during welding.

5 is a main-portion cross-sectional view corresponding to XX 'in FIG. 4;

FIG. 6 is a plan view of relevant parts showing a connection state between a winding terminal and a terminal of a conventional electric motor.

FIG. 7 is a cross-sectional view of an essential part showing a state at the time of welding a winding terminal and a terminal of a conventional electric motor.

[Explanation of symbols]

 1 Stator core 2 Yoke part 3 Almost I-shaped 4 Almost U-shaped 5 Almost inverted U-shaped 6a Inner groove 6b Outer groove 6c Inner groove 6d Outer groove 7 Insert molding part 7b Inner partition wall 7c Middle wall 7d1 Central terminal Strut 7d2 Left terminal Strut 7d3 Right terminal Strut 8a Outer winding A 8b Outer winding B 8c Outer winding C 9d Inner winding D 9e Inner winding E 9f Inner winding F AA 'Outer winding A terminal BB 'End of outer winding B CC' End of outer winding C DD 'End of inner winding D EE' End of inner winding D FF 'End of inner winding F 10 Terminal 10a Hook part 11 Movable electrode 11a Protruding part 12 Fixed electrode t Thickness of hook part h Length of protruding part

Claims (4)

[Claims] 1. A stator core provided with a tooth from a yoke portion of a stator core, a groove being formed between the teeth, and at least a tip of the tooth part facing a rotor, except for the resin, the stator core being made of resin. A plurality of terminal stanchions each having a terminal with a hook portion formed by cutting, raising, and bending, and winding the wire between the groove and the next groove. An electric motor in which a wire end is sandwiched between the hook portions and the hook portion is resistance-welded by a resistance welding machine using a movable electrode and a fixed electrode, and the end of a winding wire derived from the hook portion is resistance-welded. An electric motor characterized in that 2. The electric motor according to claim 1, wherein the terminal column is integrally formed by insert molding. 3. The electric motor according to claim 1, further comprising: an insulator having a guide path for winding formed by forming the terminal support, and the insulator being mounted in the groove. 4. The electric motor according to claim 1, wherein the movable electrode is provided with a protruding portion having a length corresponding to the thickness of the hook portion.