JP3177623B2 - induction motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a capacitor type induction motor.

[0001]

2. Description of the Related Art A capacitor-type induction motor is
It is a single-phase induction motor that has a main winding and an auxiliary winding, and uses a capacitor connected in series to the auxiliary winding, and is used for various purposes such as fans and office equipment. FIG. 3 is a circuit diagram of such a capacitor-type induction motor, and FIG. 4 is a vector diagram of a winding current and an input current in this case.
FIG. 5 shows an example of the configuration of the motor.

That is, as shown in FIGS. 3 and 4, in a capacitor-type induction motor, the auxiliary winding 21 is arranged so as to be shifted from the main winding 22 by an electrical angle of 90 °. A capacitor 23 is connected in series. That is, in the capacitor type induction motor, the auxiliary winding 21 is
A phase difference θ is provided between the motor and the main winding 22 to generate a rotating magnetic field, thereby rotating the rotor 24 to operate the motor. And since such a motor has a small starting current and a full load current and can rotate the motor immediately after the power is turned on, it can be used taking advantage of its excellent operating characteristics.

[0003] Since the capacitor 23 has the same capacity continuously during startup and during operation, a capacitor having a small capacity is used. Conventionally, an oil-filled capacitor has been used as a type of such a capacitor 23. However, as the weight and size of the fan and office equipment have been reduced, the size of the motor has been required to be reduced. Instead, film capacitors have been used. Such a film-shaped capacitor uses a resin such as PP or PET as a film constituting material,
For example, it is formed so as to have a withstand voltage of 220 V and a capacity of 4 μF, and is wound and housed in a case having a width of 10 mm, a depth of 30 mm, and a height of 20 mm.

[0004]

However, such a conventional capacitor-type induction motor has the following problems. That is, as shown in FIG. 5, the induction motor M includes the rotor 24, the stator 2
5 and the like and a capacitor 23,
The periphery is covered by a frame 26. In this case, conventionally, the capacitor 23 housed in the case inside the frame 26 is externally attached to motor components such as the rotor 24 and the stator 25. Therefore,
If only these motor components are downsized,
Since the space occupied by the capacitor is not changed, there is a limit to miniaturization of the entire motor. Moreover, since the capacitor is located separately from the motor components,
A connection wiring for connecting the capacitor and the auxiliary winding is required. Such an increase in the number of parts has led to an increase in the number of assembling steps during manufacturing and an increase in complexity of work, and has led to a decrease in production efficiency.

[0005] In order to solve such a problem, it is conceivable to provide a capacitor built in another motor component such as the inside of the stator. However, even if the case accommodating the capacitor is built in the motor component, it does not lead to downsizing of the motor component. In addition, using the capacitor without storing it in the case has problems in heat resistance of the capacitor against heat generation of the motor during operation of the motor, insulation between the motor component members and the capacitor, and the like. For example, during operation of the motor, the temperature of the motor rises to 120 ° C. or higher, usually to about 130 ° C., so a film capacitor made of PP resin or the like having a heat-resistant temperature of about 80 ° C. to 100 ° C. is stored in the case. If it is provided in the motor without performing this, the function as a capacitor may be impaired.

SUMMARY OF THE INVENTION The present invention has been provided to solve the above-mentioned problems of the prior art. It is an object of the present invention to reduce the size and the size of a motor by enabling a film capacitor to be incorporated in a motor component. It is an object of the present invention to provide an inexpensive induction motor with high production efficiency by reducing the weight, further reducing the number of members and simplifying the assembly process.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems , the invention according to the first aspect of the present invention relates to a cylindrical iron core.
Stator with windings wound around it and rotatable inside it
And a rotor arranged in the
Induction motor to which a capacitor is connected
The core is made of resin so that its surface is covered.
And the outer peripheral surface of the resin has the iron core
An annular capacitor mounting part is provided along the circumferential direction,
A film capacitor is used as the capacitor,
In the capacitor mounting portion, the film capacitor
Are directly wound in an annular shape .
The invention according to claim 2 is a table of resin covering the iron core.
A circuit pattern is formed on the surface, and the film capacitor
And the circuit pattern are connected by a ring-shaped electrode.
Is characterized.

[0008]

The invention according to claim 1 configured as described above is
According to the report, the surface of the cylindrical iron core of the stator is covered with resin.
And on the outer peripheral surface of the resin along the circumferential direction of the iron core.
An annular condenser mounting portion is provided. So this
What is the core and the capacitor mounted on the capacitor mounting part?
It can be insulated by grease. And the capacitor mounting part
Film capacitors are used for
Used, the circle of the iron core inside the annular condenser mounting part
It is directly wound along the circumferential direction and is securely mounted.
According to the invention described in claim 2, the inductor described in claim 1 is provided.
Of the resin covering the iron core
Road pattern is formed and mounted on the capacitor mounting part
The film capacitor and this circuit pattern
Easy connection by poles.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the induction motor of the present invention will be specifically described below with reference to FIGS. (1) Configuration of the Embodiment The induction motor of the present embodiment includes a cylindrical stator 1 having an opening in the center and a rotor 2 coaxially arranged with the stator 1 in the opening. . The stator 1 includes a cylindrical core 2 and a winding 11 wound around the core 2.

The iron core 2 is formed by vertically stacking ring-shaped thin silicon steel plates, and has U-shaped grooves 3 formed at regular intervals on the inner peripheral surface thereof, opening in the center direction of the ring. . Such an iron core 2 is insert-molded with a resin, housed inside a resin part 4 as shown in FIG. 2, and provided so that its surface is covered with the resin. The winding 11 is wound around the outside of the resin part 4 to be electrically insulated from the iron core 2.
The U-shaped groove 3 of the iron core 2 is wound around a portion corresponding to the inner peripheral portion from the outer peripheral edge.

Circuit patterns 5 connected to the stator 1 are formed on both side surfaces (upper and lower surfaces in FIG. 2) of the resin portion 4. A pair of upper and lower protrusions 6 are formed in a horizontal direction on the outer peripheral surface (the left surface in FIG. 2) of the resin portion 4, and a concave capacitor mounting portion surrounded by the protrusions 6 forms a stator core. Are formed in an annular shape along the circumferential direction. On both sides of the concave capacitor mounting portion, a ring-shaped electrode 8 composed of a cathode 8a and an anode 8b is arranged along the inner surface of the protruding portion 6. A conductive portion is provided on the surfaces of the cathode 8a and the anode 8b by attaching and spraying a metallikon 9, and the conductive portion and the circuit pattern 5 are connected by a lead wire 10. Between such a cathode 8a and an anode 8b, the film capacitor 7 is attached to the resin portion 4 by being wound around from the outside.

The film capacitor 7 is made of high heat resistant PP
Insulating film 7c made of S resin or Teflon resin
And an electrode plate comprising a negative electrode plate 7a and a positive electrode plate 7b on which a circuit pattern is deposited. In other words, the negative electrode plate 7a and the positive electrode plate 7b are provided so as to be covered with the insulating film 7c, are arranged at positions shifted from each other in the width direction, and are alternately stacked via the insulating film 7c. The negative electrode plate 7a is in contact with the cathode 8a of the ring electrode 8, and the positive electrode 7b is in contact with the anode 8b of the ring electrode 8. Therefore, the electrode plate of the film capacitor 7 is connected to the circuit pattern 5 via the lead wire 10 connected to the conductive portion provided on the ring-shaped electrode 8.
And is electrically connected to the stator 1.

According to the present embodiment having such a configuration, the film capacitor 7 can be mounted on the outer periphery of the stator 1 via the resin portion 4 in a film state without being housed in a special case. Since it becomes possible, a space for disposing a capacitor externally attached to a motor component as in the related art becomes unnecessary. Therefore, it is possible to greatly reduce the size of the entire motor.

Further, since the circuit pattern 5 connected to the stator 1 and the electrode plate of the capacitor 7 can be easily conducted through the ring-shaped electrode 8 and the lead wire 10 connected thereto, Assembly work becomes easy. Therefore, the connection wiring for connecting the externally attached capacitor and the auxiliary winding as in the related art is unnecessary, and the number of members can be reduced and the assembly process at the time of manufacturing can be simplified.
An inexpensive, compact and lightweight induction motor can be provided.

Further, since the film capacitor 7 is wound around a concave capacitor mounting portion formed on the resin portion 4, the film capacitor 7 can be securely mounted. In particular, since the ring-shaped electrode 8 is fixed to the concave mounting portion, the mounting displacement and the like hardly occur even after the film capacitor 7 is mounted. Therefore, it is possible to provide an induction motor in which the film capacitor 7 is reliably operated, the starting current and the total load current are small, and the operating characteristics are always good.

Further, since the core 2 is provided so that the entire surface is covered with the resin portion 4, electrical insulation between the film capacitor 7 and the core 2 can be reliably maintained, and the capacitor is not stored in the case. The problem of insulation that occurs when the motor is provided can be easily solved. Since the heat-resistant PPS resin or Teflon resin is used as the material of the insulating film of the film capacitor 7, the film capacitor 7 can sufficiently have heat resistance against heat generation during use of the motor.

The present invention is not limited to the above-described embodiment, and the specific shapes of the respective members, or the mounting positions and methods of the respective members can be appropriately changed.

For example, when the iron core is built into the resin portion 4, the resin portion 4 and the iron core 2 are integrally molded as in insert molding to cover the entire iron core with the resin. Molding may be performed in a diametrical direction (horizontal direction in FIG. 2) or in a direction parallel to the axis (vertical direction in FIG. 2).

The protruding portions 6 provided on the upper and lower surfaces of the resin portion 4 are not necessarily limited to this shape, and the ring-shaped electrode 8 is directly provided on the outer peripheral edge of the resin portion 4 without providing the protruding portion 6. By arranging, it is also possible to arrange a film capacitor between both electrodes of the ring-shaped electrode 8.

The film material of the capacitor is PP
The material is not limited to the S resin and the Teflon resin, and may be appropriately changed as long as the material has high heat resistance. In this case, it is also possible to change the rating of the motor according to the characteristics of the film.

[0021]

As described above, according to the present invention, the film capacitor is securely mounted by directly winding the film capacitor around the outer peripheral surface of the resin portion covering the iron core of the stator. Therefore, it is possible to provide a small and lightweight induction motor in which the number of members is reduced and the assembly process is simplified.

[Brief description of the drawings]

FIG. 1 is a main part plan view showing an induction motor according to an embodiment of the present invention.

FIG. 2 is a sectional perspective view taken along the line AA ′ of FIG. 1;

FIG. 3 is a circuit diagram showing a capacitor type induction motor.

FIG. 4 is a vector diagram of a current and an input current of the winding in FIG. 3;

FIG. 5 is a side sectional view showing a main part of a conventional capacitor-type induction motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Stator 2 ... Iron core 3 ... U-shaped groove 4 ... Resin part 5 ... Circuit pattern 6 ... Projection part 7 ... Film capacitor 8 ... Ring-shaped electrode 9 ... Metallicon 10 ... Lead wire 11 ... Winding 12 ... Rotor 21 … Auxiliary winding 22… Main winding 23… Capacitor 24… Rotor 25… Stator 26… Frame M… Motor

Claims (2)

(57) [Claims] A winding is wound around a cylindrical iron core.
Stator and rotatably arranged inside it
And a capacitor is connected to the winding of the stator.
In the induction motor described above, the iron core is made of resin so that its surface is covered.
It is integrally molded, and a ring is formed on the outer peripheral surface of the resin along the circumferential direction of the iron core.
Jo capacitor mounting portion is provided in the film capacitor is used as the capacitor, the capacitor mounting portion, the film capacitor
Is wound directly in an annular shape . 2. A circuit is provided on a surface of a resin covering the iron core.
A pattern is formed, and the film capacitor and the circuit pattern form a ring.
The induction motor according to claim 1, wherein the induction motor is connected by a shape electrode .