JPS6343539A - Stator of motor - Google Patents

Abstract

PURPOSE:To reduce needless exciting current and to improve motor efficiency, by providing a non-magnetic substance on the outside circumference of the projection of an iron core fitted into motor housings. CONSTITUTION:Projections 2 of a stator 112 are provided at four spots in equal intervals of the outside circumference of an iron core 1 over which coils 113 are wound around respectively. At the centre of the outside circumference of each projection 2, a circular lug 3 is formed, to which a nonmagnetic substance 4 made of a non-ferrous pipe partly cut off in C-shape in its cross section. The nonmagnetic substance 4 is brought into contact with the inside circumferential surface of motor housings 110 and 111, so that the iron core 1 is fitted in and fixed. Thus, the magnetic flux flowing into the motor housings is so reduced that the motor efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a stator for a small motor having a toroidal coil wound around an iron core.

BACKGROUND OF THE INVENTION Conventionally, the stator of this type of motor has generally been constructed as shown in FIGS. 4 and 6. That is, the stator 112 fixed inside the motor housings 110, 111 made of steel plates is attached to the inner peripheral surface of the motor housings 110, 111 at four equally spaced locations on the outer periphery of the iron core 114 around which the toroidal coil 113 is wound. A protrusion 116 is provided that fits into the inner peripheral surface of the motor housing 110, 111 so as to be fixed with a predetermined insulating distance between the motor housing 110 and the coil 113. Note that inside the stator 112, a rotor 117 into which a shaft 116 was press-fitted was supported by a bearing 118 and provided concentrically to form a motor.

Problems to be Solved by the Invention In such a conventional configuration, the magnetic flux excited by the coil 13 flows from the iron core 114 to the rotor 117 and from the iron core 1 to the rotor 117.
14 through a protrusion 115 of the motor housing 110.
The flow to rotor 111 and the former rotor 117
The flow of magnetic flux to the motor is effective in generating torque, but
The latter flow of magnetic flux to the motor housings 110, 111 is an ineffective flow that does not contribute at all to torque generation of the motor. Therefore, this motor housing 110°1
Since an unnecessary excitation current that creates a flow of magnetic flux to 11 also flows, there is a problem that the efficiency of the motor decreases.

The present invention is intended to solve these problems, and aims to improve motor efficiency by reducing unnecessary excitation current that creates ineffective magnetic flux.

Means for Solving the Problem In order to solve this problem, the present invention provides protrusions that fit into the inner peripheral surface of the motor housing at four equally spaced locations on the outer circumference of the iron core around which the coil is wound. The stator of the motor has a structure in which a non-magnetic material obtained by cutting out a portion of a non-ferrous metal pipe with a C-shaped cross section is fitted into a circular protrusion formed at the center of the outer periphery of the protrusion.

With this configuration, a non-magnetic material is provided on the outer periphery of the protruding part of the iron core that fits into the motor housing, so the magnetic resistance at the fitting part is large and the magnetic flux from the iron core to the motor housing is reduced. The flow is reduced and therefore the excitation current that creates the flux flow is reduced, increasing the efficiency of the motor.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 3. Note that the same components as those in the prior art are given the same reference numerals, and the description thereof will be omitted.

The feature of this embodiment is that the protrusions 2 are provided on four concentric circles protruding from the outer periphery of the iron core 1 at four equal intervals. That is, a circular protrusion 3 is formed at the center of the outer periphery of the protrusion 2, and the cross section C
Non-magnetic material 4 made by cutting out a part of a non-ferrous metal pipe in the shape of a letter
The mating doo. Then, the non-magnetic material 4 is brought into contact with the inner peripheral surfaces of the motor housings 110, 111, and the iron core 1 is fitted and fixed.

In the above configuration, the magnetic flux excited by the coil 113 flows from the iron core 1 to the rotor 117, and from the iron core 1 to the protrusion 2.
The motor housing 11o passes through the motor housing 11o.

It is divided into two parts, the flow to motor housing 1
10, 111, the magnetic flux flow to the motor housing 11
The protruding portion 2 of the iron core 1 fits into the inner circumferential surface of the iron core 1.
Since the non-magnetic material 4 made of non-ferrous metal is provided on the outer periphery of the motor, the magnetic resistance between the iron core 1 and the motor housing 110, 111 is reduced by a large value υ.

As described above, according to this embodiment, since the non-magnetic material 4 made of non-ferrous metal is provided on the outer periphery of the protrusion 2 of the iron core 1, the magnetic resistance between the motor housing 110, 111 and the iron core 1 increases, The flow of magnetic flux into the motor housing 110, 111 is reduced, and therefore the excitation current that creates this flow of magnetic flux is also reduced, increasing the efficiency of the motor.

Effects of the Invention As described above, according to the present invention, since the non-magnetic material of non-ferrous metal is provided on the outer periphery of the protrusion of the iron core, the magnetic resistance increases and the flow of magnetic flux to the motor housing decreases. , the excitation current that creates the flow of magnetic flux is reduced, resulting in an effect that the efficiency of the motor is improved.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway view of a motor using a motor stator according to an embodiment of the present invention, and Fig. 2 is a partially cutaway view of the same motor.
Figure 3 is an assembly diagram of the iron core and non-magnetic material of the same motor, Figure 4 is
The figure is a partially cutaway front view of a motor using a conventional motor stator, and FIG. 6 is a partially cutaway side view of the same motor. 1...Iron core, 2...Protrusion, 3...
...Protrusion, 4...Nonmagnetic material, 110,111
...Motor housing, 113...Coil. Name of agent: Patent attorney Toshio Nakao and one other person
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Claims (1)

[Claims] An iron core around which a coil is wound, a motor housing made of an iron plate that houses the iron core, and a portion of the iron core that comes into contact with the motor housing has four protrusions equally spaced apart,
A motor stator is formed by fitting a non-magnetic material obtained by cutting a portion of a non-ferrous metal pipe into a C-shaped cross section into a circular protrusion formed at the center of the outer periphery of the protrusion.