JPS62217832A - Housing of motor - Google Patents

Abstract

PURPOSE:To decrease the exciting current with the magnetic resistance increased and improve the motor efficiency, by providing a nonferrous ring between the projection of an iron core and a housing. CONSTITUTION:A coil 3 is wound around an iron core 1, of which on four(4) spots of the outside circumference projections 2 are provided. A rotor 4 is supported by a shaft 5. On the inside surface of a housing 7 made of iron plate, a ring 6 of nonferrous metal such as aluminum, etc. is fixed, to which the projection 2 of the iron core 1 is inserted. The flux excited by the coil 3 allows two(2) flows: the one from the iron core 1 to the rotor 4; the other from the iron core to the housing 7 through a projection. the latter i.e. the flow to the housing 7 becomes worse by the nonferrous metal of the ring 6 and the flux is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a housing for a small motor in which a toroidal coil is wound around an iron core. The configuration was as shown in FIG. In Figure 4, 12
is an iron core, 13 is a protrusion provided on four concentric circles protruding from the outer periphery of this iron core 12, 14 is a coil wound around the iron core 12 in a toroidal manner, and 15 is a rotation rotating inside the iron core 12. A shaft 16 supports the rotor 16, and a shaft 17 fits into the protrusion 13 of the iron core 12 to rotate the iron core 1.
A steel plate housing 18 supporting the housing 2 is a 7 flange bent outward at the opening edge of the housing 17. In FIG. 6, reference numeral 19 denotes an iron plate housing located on the opposite side to the nousing 17 and supporting the iron core 12;
Reference numeral 20 designates a flange 1 formed on the opening edge of the housing 19 and bent outward.
Match 8.

21 is a bearing that supports the shaft 16, and the housing 17°1
It is supported by 9.

Problems to be Solved by the Invention In such a conventional configuration, the magnetic flux excited by the coil 14 flows from the iron core 12 to the rotor 16, and from the iron core 12 through the entire protrusion 13 to the housing 17° 19. Two flows are formed. The flow of magnetic flux to the rotor 16 of the former is effective in generating torque of the motor, but the flow of magnetic flux to the rotor 16 of the latter is effective for generating torque of the motor.
The flow of magnetic flux to 9 is an ineffective flow that does not contribute at all to the torque generation of the motor. Therefore, since an excitation current is required for the flow of magnetic flux to these housings 17 and 19, unnecessary current must be passed, resulting in a problem of reduced motor efficiency.

The present invention solves these problems by increasing the magnetic resistance to the housing and reducing the flow of magnetic flux.
The purpose is to reduce the excitation current and increase the efficiency of the motor.

Means for Solving the Problem In order to solve this problem, the present invention fixes a non-ferrous metal glue/glue cut off at one place on the inner surface, and attaches the outer periphery of the iron core with a toroidal coil completely wrapped around this ring. The motor housing is made of an iron plate into which protrusions provided at four locations fit.

Effect: With this configuration, the flow of magnetic flux to the housing through the protrusion of the iron core is impaired by the influence of the non-ferrous metal, as a ring of non-ferrous metal is formed on the inner surface of the housing, resulting in a large magnetic resistance. Therefore, the excitation current decreases and the efficiency of the motor increases.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 to 3. In the figure, 1 is an iron core, 2 is a protrusion provided on four concentric circles protruding from the outer periphery of the iron core 1, 3 is a coil wound around the iron core 1 in a toroidal manner, and 4 is the inside of the iron core 1. 6 is a shaft that supports this rotor 4, 7 is a housing made of iron plate, and a ring 6 made of a non-ferrous metal such as aluminum with one part cut out is fixed to the inner surface, and an iron core 1 is attached to this ring 6. The protrusion part 2 of is fitted.

8 is a flange bent outward at the opening edge of the housing 7; 10 is located on the opposite side of the housing 7; a ring 9 similar to the ring 6 is fixed to the inner surface of the flange; Part 2 is fitted.

Reference numeral 11 denotes a flange bent outward at the opening edge of the housing 1o, and is made to match with the flange 8 formed on the housing 7. The outer diameter of the ring 6.9 before being held in the housing 7.1o is larger than the inner diameter of the housing 7.10 and is fixed by the spring action of the ring 6.9.

In the above configuration, the magnetic flux excited by the coil 3 is
There are two flows: one from the core 1 to the rotor 4 and the other from the iron core 1 through the protrusion 2 to the housings 7 and 10, but the flow of magnetic flux to the housing 7.10 is caused by the non-ferrous metal such as aluminum in the ring 6.9. This worsens the magnetic resistance and increases the magnetic resistance.

Since there is a non-ferrous metal such as aluminum between the housing 7.1o and the protrusion 2, the flow of magnetic flux is impaired. When the magnetic flux flow is reduced, no excitation current is required for this purpose, increasing the efficiency of the motor.

Effects of the Invention As described above, according to the present invention, by providing a ring made of non-ferrous metal such as aluminum between the protrusion of the iron core and the housing, the magnetic resistance between the iron core and the housing is increased, the excitation current is reduced, and the motor This has the effect of increasing efficiency.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional front view of the motor housing of a motor using a motor housing according to an embodiment of the present invention;
Figure 2 is a partially broken plan view of the same motor, Figure 3 is a perspective view showing the natural state of the ring of the motor, and Figure 4 is a full cross-section of the housing of a motor using a conventional motor housing. The front view and FIG. 5 are sectional views of the same motor. 1...Iron core, 2...Protrusion, 3...
・・・Coil, 6゜9...Ring, 7,1o・
·····housing. Name of agent: Patent attorney Toshio Nakao and one other person
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Claims (1)

[Claims] A non-ferrous metal ring with one section cut out is fixed on the inner surface.
This ring is a steel plate motor housing that fits into four protrusions on the outer periphery of an iron core wrapped with toroidal coils.