JPH10234150A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor which has attain improved reliability and productivity by preventing the generation of cracks at the corners of both end plates. SOLUTION: This motor, involving a stator, is formed of a roughly I-shaped tooth parts at equal intervals from the yoke part of a stator core, forming roughly U-shaped tooth parts symmetrically with regard to both sides from every other base end of the roughly I-shaped tooth part, forming inner grooves 6a, 6c, and outer grooves 6b, 6d at the inside and outside of the tooth part, covering a stator core by means of insert-molding 7 by a resin, forming a groove-insulating layer 7f at the inner grooves 6a, 6c and the outer grooves 6b, 6c and end plates 7a at both the end parts of the stator core 1, and serial- winding inside windings 9d, 9e, and 9f between the inner grooves 6a, 6c and the next inner grooves 6a, 6c, and outside windings 8a, 8b, and 8c between the outer grooves 6b, 6d, and the next outer grooves 6b, 6d, and recessed part 7e is formed at the position which meets the pole center of the outside windings 8a, 8b, and 8c at both the end plates 7a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, and more particularly, to a method for forming an insulator for a stator core.

[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. 1 is a plan view showing a stator core of a conventional electric motor,
FIG. 6 is a plan view showing a crossover side of an example of a conventional motor stator, FIG. 7 is a plan view showing a connection side of an example of a conventional motor stator, and FIG. 8 is a main part of FIG. It is an enlarged plan view.

[0003] From the yoke portion 2 of the stator core 1, substantially I-shaped teeth 3 are provided at equal intervals. A substantially U-shaped tooth portion 4 and a substantially inverted U-shaped tooth portion 5 are provided on both sides from the base end of every other I-shaped tooth portion, and the substantially U-shaped tooth portion 4 is provided. The inner groove 6a, the outer groove 6b, and the inner groove 6 are respectively provided inside and outside the substantially inverted U-shaped tooth portions 5.
c, the outer groove 6d is formed, and the stator iron core 1 of 24 slots is formed.

Here, the stator core 1 is covered by insert molding with resin except for at least the tips of the teeth facing the rotor, and the inner grooves 6a and 6c and the outer grooves 6 are formed.
b and 6d, a groove insulating layer 7f, and end plates 7a formed at both ends of the stator core 1, and the outer grooves 6 on the connection side and the crossover side are formed.
b, 6d and the inner grooves 6a, 6c, an intermediate partition 7c, an inner partition 7b at the inner peripheral portion, an outer peripheral portion on the connection side, and the intermediate partition 7c.
A right, center, and left terminal post 7d3 having a terminal for winding connection at the tip thereof along the substantially inverted U-shaped tooth portion 5 and the substantially U-shaped tooth portion 4 between them. 7d1 and 7d2 and an outer partition 7d and the like are integrally protruded from the outer peripheral portion on the crossover line side.

The outer winding 8a is wound between the outer groove 6b and the next outer groove 6d. Similarly, 8b and 8c are wound around other grooves to form outer windings 8b and 8c.
And terminals AA 'of the outer windings 8a, 8b, 8c,
BB 'and CC' are led out from the connection side along the guide path of the insert molding, and as shown in FIG.
It is connected and fixed to the terminals of d3, 7d1, and 7d2 by welding or soldering.

Next, the inner winding 9d is wound between the inner groove 6a and the next inner groove 6c. Similarly, 9e and 9f are wound around other grooves to form inner windings 9e and 9f.
Then, the terminals DD 'of the inner windings 9d, 9e, 9f,
EE ', FF' are led out from the connection side along the guide path of the insert molding, and the terminal posts 7d3, 7d1, 7d are drawn out.
Connect to terminal 2 and fix.

[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, the thickness of the groove insulating layer is 0.3
The thickness was almost uniform from mm to 0.7 mm, and the thickness of the end plate was about 2 mm. Then, the outer windings 8a, 8b, 8c are subjected to heat cycle and heat shock.
There is a problem that cracks may occur at the corners of the end plates 7a due to stress concentration at the very center of the above.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned conventional problems, and it is intended to prevent the occurrence of cracks at the corners of the both end plates at the pole center of the outer winding of an electric motor, and It is an object of the present invention to provide a motor with improved productivity and improved productivity.

[0010]

In order to achieve the above object, substantially I-shaped teeth are provided at equal intervals from the yoke of the stator core, and every other substantially I-shaped tooth is provided. Symmetrical substantially U-shaped teeth are provided on both sides from the base end of the base, and an inner groove and an outer groove are formed on the inside and outside of the substantially U-shaped teeth, respectively, and at least the rotor is opposed to the rotor. Except for the tips of the teeth, the stator core is covered with resin, a groove insulating layer is formed in the inner groove and the outer groove, and end plates are formed at both ends of the stator core, and the inner groove and the next inner groove are formed. In the electric motor provided with a stator formed by directly winding the outer winding between the outer groove and the next outer groove, the inner winding corresponds to the pole center of the outer winding on the both end plates. A concave portion is formed at the position.

Further, the end plate and the groove insulating layer are formed by insert molding integrally with the stator core.

Alternatively, the end plate and the groove insulating layer are provided on an insulator formed separately from the stator core, and the insulator is mounted in the groove.

The length of the recess in the center direction is at least half the length h in the center direction between the outer peripheral portion of the stator core and the inner groove.

Further, the circumferential length of the concave portion is set to be at least 2/3 of the length between the outer groove on which the outer winding is wound and the next outer groove.

Further, the depth of the recess is set to be at least half the thickness of the resin covering the end face of the stator core.

On the other hand, the material of the resin is a thermoplastic resin. And, the thermoplastic resin is PBT
(Polybutylene terephthalate) or PPS (polyphenylene sulfide) or PET (polyethylene terephthalate).

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION A substantially I-shaped tooth portion is provided at equal intervals from a yoke portion of a stator core, and a symmetrical substantially symmetrical core is provided on both sides of the base end of every other I-shaped tooth portion. -Shaped teeth are provided, and an inner groove and an outer groove are formed inside and outside the substantially U-shaped teeth, respectively.
Except at least the tip of the tooth portion facing the rotor,
Covering the stator core with resin, forming a groove insulating layer in the inner groove and the outer groove, and end plates at both ends of the stator core,
An electric motor having a stator formed by directly winding an inner winding between the inner groove and the next inner groove and an outer winding between the outer groove and the next outer groove. A concave portion is formed at a position corresponding to the pole center of the winding.

Further, cracks can be prevented from occurring at the corners of the both end plates at the pole center of the outer winding of the electric motor, and the reliability can be improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail for a 24-slot 6-pole motor with reference to the accompanying drawings. The same reference numerals are used for the same parts as in the conventional example. FIG. 1 is a plan view showing a stator core of a motor of the present invention, FIG. 2 is a plan view showing a crossover side of an embodiment of a stator of a motor of the present invention,
FIG. 3 is a plan view showing a connection side of an embodiment of a motor stator according to the present invention, FIG. 4 is an enlarged plan view of a main part of FIG.
FIG. 2 is a sectional view of a main part of a stator of the electric motor of the present invention.

Substantially I-shaped teeth 3 are provided at equal intervals from the yoke 2 of the stator core 1. A substantially U-shaped tooth portion 4 and a substantially inverted U-shaped tooth portion 5 are provided symmetrically on both sides from every other base end of the substantially I-shaped tooth portion 3, and the substantially U-shaped tooth portion is provided. 4. An inner groove 6a, an outer groove 6b, an inner groove 6c, and an outer groove 6d are respectively formed inside and outside each of the substantially inverted U-shaped teeth 5, thereby forming the stator iron core 1 having 24 slots.

Here, the stator core 1 is covered by insert molding 7 of a thermoplastic resin, PBT (polybutylene terephthalate) resin, except for at least the tip of the tooth portion opposed to the rotor. 6a, 6c, outer grooves 6b, 6d, a groove insulating layer 7f, and end plates 7a at both ends of the stator core 1, and the outer grooves 6b, 6d and the inner grooves 6a on the connection side and the crossover side. 6c intermediate partition 7c
And an inner partition wall 7b at the inner peripheral portion, and a winding between the outer peripheral portion on the connection side and the intermediate partition wall along the substantially inverted U-shaped tooth portion 5 and the substantially U-shaped tooth portion 4. The right, center, and left terminal posts 7d3, 7d1, and 7d2 each having a connection terminal at the end thereof, and an outer partition wall 7d and the like are formed on the outer peripheral portion on the crossover side. And
The outer windings 8 on the connection side and the crossover side of the end plates 7a
In order to prevent stress concentration at positions corresponding to the pole centers of the a, 8b and 8c, the length w in the center direction is set at least to the center between the outer peripheral portion of the stator core 1 and the inner grooves 6a and 6c. The length h in the circumferential direction, and the length L in the circumferential direction
Is set to at least の 長 of the length S between the outer groove for winding the outer winding and the next outer groove, and the depth D is set to the thickness t of the resin covering at least the end face of the stator core. A substantially square concave portion 7e which is に of the above is formed.

Here, the outer winding 8a is wound between the outer groove 6d and the next outer groove 6b. Further, it is wound between the outer groove 6d adjacent thereto and the next outer groove 6b. Similarly, each nozzle is wound around each groove by using another nozzle to form each outer winding 8b, 8c.

The terminals AA 'and B of the outer winding
B ′ and CC ′ are led out from the connection side along the guide path of the insert molding, and the ends of the windings are connected to the terminals and fixed.

Next, the inner winding 9d is wound between the inner groove 6a and the next inner groove 6c. Similarly, each of the inner windings 9e is wound around each groove using another nozzle.
9f is formed. And a terminal DD 'of the inner winding;
EE 'and FF' are led out from the connection side along the guide path of the insert molding, and the ends of the windings are connected to the terminals and fixed. Note that terminals GG ′, HH ′, II ′
Is the end of the deceleration winding that is double wound on the outer winding,
The description is omitted because it is not always necessary. In this way, a stator having 24 slots and 6 poles is formed.

Here, the effect of forming the concave portion 7e in the both end plates 7a at the pole center of the outer windings 8a, 8b, 8c will be described.

At the base end of the substantially I-shaped teeth 3, symmetrical substantially U-shaped teeth 4, 5 are concentrated, and the terminal posts 7d3, 7d1, 7d2, intermediate partition When 7c or the like is formed, the influence of stress due to sink during molding of the thermoplastic resin is large.

In the case of the present invention, a substantially quadrangular concave portion 7e is formed at a position corresponding to the pole center of the outer windings 8a, 8b, 8c of the end plates 7a, which is this portion.
Concentration of shrinkage at the thick portion can be prevented, stress concentration at corners can be prevented, and cracks can be prevented.

As a result, the outer windings 8a, 8b,
The occurrence of cracks at the corners of the both end plates 7a at the very center of 8c can be prevented, and the reliability can be improved.

The inner grooves 6a, 6c and the outer grooves 6b, 6
d, a groove insulating layer 7f, and end plates 7a formed at both ends of the stator core 1; an intermediate partition 7c between the outer groove and the inner groove on the connection side and the crossover side; A terminal for winding connection is provided at the tip of the inner partition wall 7b, between the outer peripheral portion on the connection side, and the intermediate partition wall, along the substantially inverted U-shaped and substantially U-shaped teeth. Right, center and left terminal posts 7d3, 7d
1, 7d2, etc., at the positions corresponding to the pole centers of the outer windings 8a, 8b, 8c of the end plates 7a, the length w in the center direction of the concave portion 7e is set at least in the center direction of the terminal support. And the length L in the circumferential direction of the concave portion 7e should be at least 2/3 of the length S between the outer groove around which the outer winding is wound and the next outer groove. An insulator having a substantially square recess 7e whose depth is at least half the thickness t of the resin covering the end face of the stator core is formed separately from the stator core. (In the figure, it is not shown because it has the same shape as the insert molding portion 7), and the insulator may be mounted in the groove.

On the other hand, the thermoplastic resin may be PPS (polyphenylene sulfide) or PET (polyethylene terephthalate).

[0031]

As described above, in the present invention, substantially I-shaped teeth are provided at equal intervals from the yoke of the stator core, and every other base end of the substantially I-shaped teeth is provided. More substantially symmetrical U-shaped teeth are provided on both sides, inside and outside of the substantially U-shaped teeth,
An inner groove and an outer groove are respectively formed, and the stator core is covered with resin except for at least a tip of the tooth portion opposed to the rotor, a groove insulating layer is provided in the inner groove and the outer groove, and the stator core is formed. End plates are formed at both ends of the inner groove, an inner winding is provided between the inner groove and the next inner groove, and a stator is formed by directly winding an outer winding between the outer groove and the next outer groove. In the electric motor, a concave portion is formed at a position corresponding to the pole center of the outer winding of the both end plates.

As a result, it is possible to provide a motor in which cracks are prevented from being generated at the corners of the both end plates at the pole center of the outer winding of the motor, thereby improving reliability and productivity.

[Brief description of the drawings]

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

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

FIG. 3 is a plan view showing the connection side of one embodiment of the stator of the electric motor according to the present invention.

FIG. 4 is an enlarged plan view of a main part of FIG. 2;

FIG. 5 is a sectional view of a main part of a stator of the electric motor of the present invention.

FIG. 6 is a plan view showing a crossover side of an example of a stator of a conventional electric motor.

FIG. 7 is a plan view showing a connection side of an example of a conventional motor stator.

FIG. 8 is an enlarged plan view of a main part of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator iron core 2 Yoke part 3 Substantially I-shaped tooth part 4 Substantially U-shaped tooth part 5 Substantially inverted U-shaped tooth part 6a Inner groove 6b Outer groove 6c Inner groove 6d Outer groove 7 Insert molding part 7a End plate 7b Inner partition wall 7c Intermediate partition wall 7d Outer partition wall 7d1 Center terminal support 7d2 Left terminal support 7d3 Right terminal support 7e Depression 7f Groove insulating layer 8a Outer winding A 8b Outer winding B 8c Outer winding C 9d Inner winding Line D 9e Inner winding E 9f Inner winding F AA'Terminal of outer winding A BB'Terminal of outer winding B CC'Terminal of outer winding C DD'Terminal of inner winding D EE'Inner winding D FF 'end of the inner winding F L length of the recess in the circumferential direction w length of the recess in the center direction D depth of the recess S length between the outer groove and the next outer groove t resin of the end plate Thickness

Claims (8)

[Claims] A substantially U-shaped tooth portion is provided at equal intervals from a yoke portion of a stator core, and is symmetrical on both sides from the base end of every other I-shaped tooth portion. Are provided, an inner groove and an outer groove are respectively formed inside and outside the substantially U-shaped tooth part, except for at least the tip of the tooth part facing the rotor,
The stator core is covered with a resin, a groove insulating layer is formed in the inner groove and the outer groove, and end plates are formed at both ends of the stator core.An inner winding is provided between the inner groove and the next inner groove. An electric motor having a stator in which an outer winding is wound directly between the outer groove and the next outer groove, at a position corresponding to a pole center of the outer winding on the both end plates,
An electric motor characterized by forming a recess. 2. The electric motor according to claim 1, wherein the end plate and the groove insulating layer are insert-molded integrally with the stator core. 3. The electric motor according to claim 1, wherein the end plate and the groove insulating layer are provided on an insulator formed separately from the stator core, and the insulator is mounted in the groove. 4. The length of the recess in the center direction is at least の of the length h in the center direction between the outer peripheral portion of the stator core and the inner groove. The electric motor according to claim 2 or 3. 5. The method according to claim 1, wherein the length of the recess in the circumferential direction is at least ２ of the length between the outer groove on which the outer winding is wound and the next outer groove. The electric motor according to claim 2 or 3. 6. The electric motor according to claim 2, wherein the depth of the recess is at least half the thickness of the resin covering the end face of the stator core. 7. The electric motor according to claim 1, wherein the material of the resin is a thermoplastic resin. 8. The electric motor according to claim 7, wherein the thermoplastic resin is PBT (polybutylene terephthalate), PPS (polyphenylene sulfide) or PET (polyethylene terephthalate).