JPH053652A - Motor - Google Patents

Abstract

PURPOSE:To prevent the tilting of the second winding in the axial direction of a stator core by integrally forming circular-arcuate inner partitions on the upper and lower surfaces of the inner end sections of three poles and inner partitions for auxiliary poles on the upper and lower surfaces of the inner end sections of auxiliary poles together with premolds in such a state that the partitions are protruded inward. CONSTITUTION:The stator core 10 of this motor is constituted by piling up a required number of core pieces punched from a hoop. A ring-like yoke section 1 is formed on the outer peripheral side and six pieces of the first winding sections 2 constituting a main pole which is protruded toward the axis 14 of a rotor 12 are equally arranged on the inner peripheral side. On the outer peripheral section of the yoke section 1, six grooves 8 are arranged in the axial direction at regular intervals. The grooves 8 are provided for piling up and welding the core pieces constituting the core 10. Inner partitions 70 for auxiliary poles at the front end sections of auxiliary poles 4 are provided to prevent the inward tilting of the second winding 7 and formed to slopes, with the slopes being made steeper as going to the inside, so that the second winding 7 can be housed at a prescribed position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor having a structure in which windings are directly wound around a stator core.

[0002]

2. Description of the Related Art The applicant of the present invention first forms a ring-shaped yoke portion on the outer periphery, and axially projects a plurality of auxiliary poles on the inner peripheral side of the yoke portion. A main pole formed between the main pole and the main pole, the main pole axially protruding from the yoke section, and an E-shaped shaft center on the inner diameter side of the first winding section. The first winding portion is provided with a first winding, and the first winding portion is provided with a tooth portion formed of three poles protruding toward the pole portion. We have proposed an electric motor that applies a second winding to the pole to be installed.

In this electric motor, when the first winding and the second winding are wound around the iron core, the coil end is substantially eliminated. For example, in the iron core having a laminated thickness of 25 mm and an output of 25 watts, it is different from the conventional one. By comparison, the copper dose is reduced by about 30%. Furthermore, this reduces the copper wire, reduces the amount of heat generation, and eliminates the coil end as in the electric motor toroidally wound on the yoke portion, so that an extremely small induction motor can be formed. In addition, the first winding and the second winding can be wound without splitting the iron core, and the magnetic flux on the side of the stator facing the rotor approaches a sine curve, resulting in less magnetic unevenness and vibration. It is very easy to manufacture, because you can get a quiet, highly efficient induction motor.

[0004]

In the induction motor having the above structure, when the second winding is wound around the stator core, the second winding is located on the axial side of the stator core, that is, the direction of the rotor. There is also a possibility of falling over and contacting the rotor.

[0005]

SUMMARY OF THE INVENTION Therefore, the present invention provides an induction motor of the above construction, which can prevent the second winding from falling down in the axial direction of the stator core.

[0006]

SUMMARY OF THE INVENTION An electric motor of the present invention has a ring-shaped yoke portion formed on the outer periphery thereof, and a plurality of auxiliary poles axially projecting toward the inner peripheral side of the yoke portion, and a plurality of these poles. A first winding part formed of a main pole formed between the auxiliary poles, the main pole projecting from the yoke part in the axial direction, and an E-shape on the inner diameter side of the first winding part. In a stator core of an electric motor, which is composed of a tooth portion composed of three poles protruding toward the axis, a part of the outer peripheral surface other than the inner peripheral surface of the stator core facing the rotor, and the upper and lower surfaces. Etc. are pre-molded with resin to cover the stator iron core, and arc-shaped inner partition walls for the main pole are provided on the upper and lower surfaces of the tip ends on the inner diameter side of the three poles protruding toward the shaft center in an E shape. Protruded integrally with the pre-mold, and the inner partition wall for the pro-pole is projected integrally with the pre-mold on the upper surface and the lower surface of the inner diameter side tip of the pro-pole. Those were.

[0007]

[Operation] In the electric motor having the above-described structure, arc-shaped inner partition walls are integrally projected with the premold on the upper and lower surfaces of the inner diameter side tip portions of the three poles, and the upper surface of the inner diameter side tip portion of the auxiliary pole Since the inner partition wall for the auxiliary pole is integrally provided on the lower surface together with the pre-mold, the second winding is prevented from falling toward the axial side of the stator core by this inner partition wall.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a stator core 10.
FIG. 2 is a perspective view of the stator core 10.

In FIG. 1, a stator core 10 of an electric motor is shown.
Is a strip steel plate that is punched and laminated by a press in a required amount. A ring-shaped yoke portion 1 is formed on the outer peripheral side, and the inner peripheral side of the yoke portion 1 faces the shaft center 14 of the rotor 12. Six first winding portions 2 forming the protruding main pole are evenly arranged.

On the inner diameter side of the first winding portion 2, a tooth portion 3 composed of three poles 3a, 3b and 3c is formed in an E shape.
The poles 3a, 3b, 3c are formed to have a minimum required width as a magnetic path in order to minimize the volume of the stator core 10. Further, the poles 3a, 3 are formed in an E shape.
Since the tooth portions 3 composed of b and 3c are formed on the inner diameter side of the first winding portion 2, six tooth portions 3 are evenly arranged like the first winding portion 2. Between the tooth portion 3 and the adjacent tooth portion 3, six commutating poles 4 projecting from the yoke portion 1 toward the inner diameter side toward the shaft center 10 are equally arranged, like the tooth portion 3. There is.

The inner diameter sides of the poles 3a, 3b, 3c and the commutating pole 4 forming the tooth portion 3 are formed in a series of arcuate shapes so as to face the outer peripheral surface of the adjacent rotor 12 with a slight gap. Has been formed. The rotor 12 is rotatably supported by a shaft (not shown), and forms a cage rotor 12 in which a secondary conductor is formed on the iron core 10 by an aluminum diecus.

On the outer peripheral portion of the yoke portion 1, six grooves 8 are provided at equal intervals in the axial direction. The groove 8 is provided for welding when the iron core plates forming the stator iron core 10 are laminated.

A first winding 6 is wound around the first winding portion 2 and is provided with a pole 3c and a pole 3a via a complementary pole 4.
The second winding wire 7 is wound between and. Both the first winding 6 and the second winding 7 are wound via both end faces of the stator core 10 in the stacking direction, and after the required amount of winding, the first winding part 2 or the adjacent first winding part 2 or It is continuously wound around the tooth portion 3. Then, the six first windings 6 and the second windings 7 are continuously provided.
Are wound in predetermined positions, the ends of the windings are pulled out and connected to a power source and a capacitor (not shown), respectively.

When the first winding 6 and the second winding 7 are wound, an insulating layer is formed in advance on a portion of the stator core 10 where the windings come into contact, and the stator core 10 has a mechanical structure. In order to improve the mechanical strength, it is injection-molded with resin called premold.

Next, details of the pre-molding of the stator core 10 will be described with reference to FIGS. 3 to 10.

The resin used for this pre-molding is a thermoplastic resin, and since it is like a liquid at high temperature and high pressure, it can be easily injected into the mold and the stator core 10 This resin spreads everywhere. Further, with this thermoplastic resin, when the temperature of the thermoplastic resin falls between the curing start temperature (about 180 ° C.) and room temperature (about 40 ° C.), the resin shrinks.

The portion of the stator core 10 where the resin layer 16 is formed by pre-molding is shown in the plan view of the pre-molded stator core 10 of FIG.
0, the upper and lower surfaces of 0, the groove 8 of the outer peripheral portion of the yoke portion 1, the outer wall of the first winding portion 2 and the outer peripheral portion of the tooth portion 3 including the poles 3a, 3b, 3c are pre-molded to form the resin layer 16. It is formed.
As a result, when the stator core 10 is pre-molded with resin, it is a thermoplastic resin, and as described above, the stator core 10 contracts between the curing start temperature and room temperature and tightens the stator core 10. Therefore, this tightening improves the mechanical strength of the stator core 10. A resin layer is not formed on the inner peripheral surface of the tooth portion 3 facing the rotor 12, that is, the inner peripheral surface of the stator core 10 by premolding. The thickness of the resin layer 16 according to the pre-mold is 0.4
The thickness is from mm to 0.7 mm.

The upper surface of the stator core 10 is the axis 1
Reference numeral 4 denotes a surface on which the bracket 54 of the stator core 10 is mounted, and the lower surface of the stator core 10 is a surface on which the shaft core 14 projects and is covered by the housing mold of the stator core 10.

This premold not only has the upper and lower surfaces of the stator core 10 covered with a resin to form a resin layer to improve the mechanical strength, but also has the following characteristics.

Reference numeral 50 is an outer partition wall. This outer partition 5
0 is the pre-mo
It is integrally formed with the other resin layer 16 by the soldering. By this outer partition wall 50, the first winding 6
When the second winding wire 7 is wound around the stator core 10, the winding wire can be protected without coming into contact with other parts. Further, when the height of the outer partition wall 50 is set higher than the coil ends of the first winding 6 and the second winding 7, the stator core 10 can be piled up, which facilitates winding work.

Reference numeral 58 is a fixing piece provided on a part of the outer partition wall 50 for fixing the winding end portion (see FIG. 4). The fixing piece 58 is provided so as to project from the upper surface of the outer partition wall 50, and a concave portion 60 for holding the winding end portion is provided in the central portion thereof. By fixing the ends of the windings to the fixing pieces 58, it is possible to mechanize the processing of the ends of the stator windings. That is, when the winding is placed on the stator core 10,
If left as it is, the winding may loosen, but if the end of the winding is fixed to this fixing piece 58, the winding will not loosen.

In the fixing piece 58 of this embodiment, the winding end is fixed by providing the recess 60 as shown in FIG. 4, but instead of this, the winding end is sandwiched between the outer partition walls 50. It is also possible to directly provide a recess for keeping the two or to fix the two fixing pieces in a displaced position and sandwich the winding end between the displaced positions.

Reference numeral 66 is an intermediate partition wall 66 projecting from the lower surface of the stator core 10. The inner partition walls 66 are six arc-shaped partition walls projecting along the lower surface of the base of the tooth portion 3 formed of the E-shaped poles 3a, 3b, 3c. The role of the partition wall 66 is that the first winding 6 and the second winding 7
Is to be insulated from the
The first winding 6 and the second winding 7 never come into contact with each other. In particular, since the inner partition wall 66 is formed in an arc shape, its strength is sufficient and the first winding 6 falls to the inner peripheral side even in a state of protruding from the lower surface of the stator core 10. Prevent.

Reference numeral 52 is a partition wall on the upper surface of the stator core 10. The septum 66 is an E-shaped pole 3
It is a partition wall of the arc-shaped first winding 6 and second winding 7 provided along the upper surface of the base of the tooth portion 3 made of a, 3b, 3c. The middle partition wall 52 is projected higher than the middle partition wall 66, and when the electric motor is assembled, the upper end of the middle partition wall 52 reaches the bracket 54. The bracket 54 is fixed to the stator core 10 by engaging the claw portion 56 protruding from the outer peripheral portion of the bracket 54 made of a steel plate into the intermediate partition wall 52. In this case, the pre-mold made of a thermoplastic resin is softer than the resin of the housing mold that covers the entire electric motor, so that the claw portion 56 of the bracket 54 can be easily bited. That is, when the claw portion 56 of the bracket 54 is to be bitten, only the upper end portion of the middle partition wall 52 is heated by ultrasonic waves to be softened, and the claw portion 56 is attached while the middle partition wall 52 is soft.

Reference numeral 68 is an inner partition wall for the main pole, which is provided in an arc shape at the tip of the pole pieces 3a, 3b, 3c. The inner partition wall 68 for the main pole is for preventing the second winding 7 from falling toward the inner peripheral side. Further, as shown in the drawing, since it is formed in a slobe shape, the second winding 7 can be fitted in a predetermined position.

Reference numeral 70 is an inner partition wall for the auxiliary pole, which is provided at the tip of the auxiliary pole 4. The inner wall 70 for the auxiliary pole is also for preventing the second winding 7 from falling to the inner peripheral side. The inner partition wall 70 for the auxiliary pole is also formed so as to be slobe as it goes inward, and the second winding 7 is formed so as to fit in a predetermined position.

Reference numeral 72 is a bushing integrally formed by premolding (see FIGS. 9 and 10).
The bushing 72 is composed of a bushing body 74 protruding from the outer periphery of the yoke portion 1 and a lid body 76 rotatably provided on the body 74. Then, at the base of the main body 74,
An insertion portion 78 for inserting the ends of the first winding 6 and the second winding 7 is provided. When assembling the bushing 72, after soldering the ends of the first winding 6 and the second winding 7 and the tip of the lead wire 80 of the lead wire, the soldered portion 82 is removed. It is inserted into the insertion portion 78 and the lid 76 is covered (see FIG. 10).

As a result, it is not necessary to attach only the bushing from the outside as in the conventional case, so that the assembling process can be simplified and the cost can be reduced. When the bushing is integrally molded, the relay holding portion and the connection insulating portion are integrally molded, so that the cost can be further reduced and the work efficiency can be improved.

With the pre-molded structure of the stator core 10 having the above structure, the mechanical strength of the stator core 10 is improved by applying this pre-molded structure, and further, the first winding 6 and the second winding 6 are wound. It is also possible to insulate the wire 7.

[0031]

As described above, according to the electric motor of the present invention,
The inner partition wall formed integrally with the premold prevents the second winding from falling toward the axial side of the stator core. Also,
Even when the inner partition wall is formed, it can be easily manufactured because it is formed integrally with the premold.

[Brief description of drawings]

FIG. 1 is a plan view of a stator core.

FIG. 2 is a perspective view of a stator core.

FIG. 3 is a plan view of a stator core in a pre-molded state.

FIG. 4 is a partially enlarged perspective view of a stator core in a pre-molded state.

5 is a sectional view taken along line AA in FIG.

6 is a sectional view taken along line BB in FIG.

FIG. 7 is a semi-longitudinal sectional view of the electric motor.

FIG. 8 is an enlarged cross-sectional view of a state in which the claw portion of the bracket bites into the middle partition.

FIG. 9 is an enlarged perspective view of a bushing.

FIG. 10 is an enlarged sectional view of a bushing.

[Explanation of symbols]

 1 ... Yoke part 2 ... 1st winding part 3 ... Tooth part 3a, 3b, 3c ... Pole 4 ... Complement pole 5 ... Rotor 12 6 ... 1st winding 7 ... 2nd Winding 10 …… Stator core 12 …… Rotor 16 …… Resin layer 50 …… Outer partition wall 52 …… Medium partition wall 54 …… Bracket 56 …… Claw portion 58 …… Fixed piece 60 …… Recessed portion 66 …… Middle Partition wall 68 ... Inner partition wall for main pole 70 ... Inner partition wall for supplementary pole 72 ... Bushing 74 ... Bushing body 76 ... Lid body 78 ... Insert section 80 ... Lead wire

Claims (1)

Claim: What is claimed is: 1. A ring-shaped yoke portion is formed on the outer circumference, and a plurality of auxiliary poles projecting axially toward the inner peripheral side of the yoke portion, and between the plurality of auxiliary poles. A main pole formed in the first winding part, and the main pole is formed so as to project from the yoke part in the axial direction, and the main pole is formed in an E shape toward the axial center on the inner diameter side of the first winding part. In a stator core of an electric motor composed of tooth portions consisting of three poles that are protruded, a part of the outer peripheral surface other than the inner peripheral surface of the stator core facing the rotor, the upper and lower surfaces, etc. are made of resin. Premo
And the stator core is covered, and the arc-shaped inner partition wall for the main pole is integrally formed with the pre-mold on the upper and lower surfaces of the inner ends of the three poles protruding in the E shape toward the axis. An electric motor characterized in that an inner partition wall for the auxiliary pole is integrally provided together with the premold on the upper surface and the lower surface of the inner diameter side end portion of the auxiliary pole.