JPS6152133A - Miniature motor - Google Patents

Abstract

PURPOSE:To prevent a connector fixed and pressed in a stator core from loosening due to thermal deformation, by forming projections as parts of the connector which are fixed at the upper face section and the side face section of an end bracket. CONSTITUTION:So far as a connector 1 is concerned, a convex section 4 which is a part of the connector 1 is fixed and pressed in a concave section 3 which is provided for the end face of a stator core 2. A projection 5 with elastic action is provided for the upper face section of the connector 1, and a tapered projection 6 is provided for the front face section. The projection 5 is provided in contact with the upper face section of an end bracket 7, and the projection 6 is provided in contact with the side face of the end bracket 7 or with a small space between them. As the result of said organization, even if the concave section 3 of the stator core is loosened due to temperature rise, the connector 1 can be mechanically fixed to the stator core 2 by the projections 5, 6 which are provided for the upper section and the side section of the connector.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a connector for a sunrise part of a small electric motor, and particularly to a small electric motor suitable for fixing a connector.

[Background of the invention]

In the conventional example, as described in Japanese Utility Model Publication No. 58-2125, a convex portion of a connector is press-fitted into a concave portion provided in a stator core. However, as the temperature of the motor rises, the connector part, which is made of plastic with a high coefficient of linear expansion, expands and causes creep, which creates a gap between the stator core and the connector at room temperature, causing the connector press-fit part to become loose. It wasn't taken into consideration.

[Purpose of the invention]

An object of the present invention is to provide a small electric motor in which loosening due to thermal deformation of a connector press-fitted into a stator core is prevented.

[Summary of the invention]

When a connector is press-fitted into the stator core and the temperature rises due to the difference in linear expansion coefficient between the stator core and the connector, thermal stress becomes large and creep occurs at the connector press-fit part, causing
When it returns to K, it becomes loose. Since it is difficult to prevent this loosening at the press-fit portion of the connector, we designed a structure that allows the connector to be fixed up and down and front and back with the end bracket covered. In addition, an elastic protrusion was installed at the end of the motor, where the temperature rise is lowest, at the bracket, to reduce creep of the protrusion.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to FIG. In the connector 1, a protrusion 4, which is a part of the connector 1, is press-fitted into a recess 3 provided on an end face of a stator core 2. The connector 1 is provided with an elastic projection 5 on its top surface and a tapered projection 6 on its front surface. The protrusion 5 is in contact with the upper surface of the end bracket 7, and the protrusion 6 is in contact with the side surface of the end bracket 7, or is provided with a slight gap. According to the embodiment of the present invention, even if the dimensional accuracy from the stator core 1 to the upper surface of the end bracket 7 is poor, the connector 1 can be fixed from above and below by the elastic action of the protrusion 5. Further, when the end bracket 7 is fitted, even if the end bracket 7 is inserted at a slight angle, the tapered portion of the protrusion 6 serves as a guide and the end bracket 7 can be inserted without getting caught on the connector 1.

〔Effect of the invention〕

According to the present invention, even if the connector protrusion press-fitted into the stator core recess loosens due to temperature rise, the protrusions provided on the top and side surfaces of the connector will still allow the connector to be brought into contact with the end bracket, which has a low temperature rise in the motor body. At the same time, the protrusions have elasticity to alleviate creep, which has the effect of making the connector less likely to come loose.

Description of the F711 car in the drawings Figure 1 shows an embodiment of the present invention, and Figure 2 is a partial cross-sectional front view of the end bracket inserted with the connector being press-fitted into the stator core, and Figure 2 is the end bracket shown in Figure 1. FIG. 3 is a front view of a partial cross section taken in section, and FIG. 3 is a perspective view of the connector mounting component.

DESCRIPTION OF SYMBOLS 1... Connector, 2... Stator core, 3... Recessed part, 4... Convex part, 5, 6... Protrusion, 7... End bracket.

Claims (1)

[Claims] 1. In a small electric motor in which a connector with one end of the connector having a convex portion is press-fitted and fixed into a recess provided in a portion of a stator core, a protrusion is formed on a portion of the connector and the end A small electric motor characterized by being fixed at the top and side parts of a bracket. 2. A small electric motor according to claim 1, characterized in that the protrusion has an elastic action.