JPS5841698Y2 - Sewing machine motor temperature fuse mounting structure - Google Patents

Description

[Detailed description of the invention] The present invention relates to a mounting structure for a temperature fuse installed inside a sewing machine motor, and its purpose is to:
When installing a temperature fuse to prevent motor coil burnout caused by an accident with the sewing machine motor or its control circuit, the fuse is made to have good adhesion to the heating part to ensure its fuse operation and installation. This is intended to be a simple and inexpensive structure.

The structure of the temperature fuse installation for this type of motor is as follows:
There is a method in which the fuse is integrated into the stator coil of the motor and isolated with insulating tape, etc., but installation is cumbersome and requires careful insulation measures from the coil. The size of the coil becomes large, and the problem of space for accommodating it also arises.

Another method is to install it adjacent to the stator coil, stator core, etc. in a suitable space within the motor, but this has been problematic because the degree of adjacency varies depending on the assembly conditions and the fuse blowing operation cannot be determined.

In the present invention, the support of the fuse has an elastic structure and is attached to the brush holder support etc. in advance, and its position is such that it contacts the stator coil and resists elasticity when the stator coil assembly is assembled to the motor housing. The installation is such that even if there are variations in related dimensions, the fuse or fuse support will surely come into contact with the stator coil part and the fuse will operate reliably at the specified temperature. The embodiment will be explained with reference to the drawings. In the drawings, 1 is a motor housing made of an electrical insulator;
, 3 are brush holder supports, and each brush holder 4 and connecting plates 5, 6 connected to the brush holders are crimped to the supports 2, 3.

Reference numeral 7 denotes a temperature fuse having a completely closed structure, and a fuse body 8 forming a heat-sensitive portion is provided with lead wires 9 and 10 at both ends for taking in current.

An elastic body 11 consisting of two curved conductive leaf springs has one end 12 spot welded to each lead wire 9, 10, and the other end 13 attached to each brush holder support 2 together with each connection plate 5, 6. , 3 are swaged.

The connecting plate 6 is connected to the eyeliner 15 of the stator coil 14, so that blowing out the temperature fuse 7 cuts off the motor load current.

16 is a stator coil.

When assembling the motor, the temperature fuse 7 comes into contact with the stator coil 14 wrapped with insulating paper 17, moves slightly by the coil against the elasticity of each elastic body 11, and comes into close contact with the coil, so that its heat-sensitive portion 8 The temperature of the stator coil 14 is directly received.

The temperature fuse 7 is designed to always come into contact with the insulating paper of the stator coil 14, so it is best to apply a thermally conductive compound to this contact area before assembling the motor for better adhesion. It is possible.

As described above, according to the present invention, the mounting structure of the temperature fuse is simplified, the mounting can absorb dimensional variations and motor assembly errors, etc. with an elastic body, and therefore manufacturing is easy, and the fuse is heat sensitive. The part is in close contact with the heating part of the motor, improving the fuse blowing performance and increasing safety.

[Brief explanation of drawings]

The figure is a partial sectional view of a temperature fuse mounting structure for a sewing machine motor showing an embodiment of the present invention. In the figure, 1 is a motor housing, 7 is a temperature fuse, 8 is a heat sensitive part thereof, 14 is a stator coil, and 11 is an elastic body.

Claims (1)

[Scope of utility model registration request] In a sewing machine motor equipped with a temperature fuse for cutting off load current of the sewing machine motor, the temperature fuse has current intake portions at both ends of the fuse body forming the heat-sensing portion, and has an elastic body made of two curved conductive leaf springs. One end of each body is fixed to each brush holder support, and each other end is fixed at each current intake part of the temperature fuse to support the heat sensitive part, and the positional relationship of the heat sensitive part with the motor housing is controlled by the elastic force. The sewing machine motor is movable against the elasticity of the elastic body, and the positional relationship of the temperature fuse is such that the stator coil and the heat-sensitive section are in contact with each other against the elasticity of the elastic body when the motor is assembled. Temperature fuse mounting structure.