JPH0241667U

JPH0241667U -

Info

Publication number: JPH0241667U
Application number: JP11836788U
Authority: JP
Priority date: 1988-09-09
Filing date: 1988-09-09
Publication date: 1990-03-22
Anticipated expiration: 2003-09-09
Also published as: JPH0646209Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例斜視図、第２図は第
１図図示矢印Ａ−Ａにおける要部縦断面図、第３
図は第２図図示矢印Ｂ−Ｂにおける断面図、第４
図は本考案の前提となる周知の一般的な小型モー
タの構成図、第５図は正特性サーミスタによる過
熱防止機能を説明するための説明図を示す。図中、１は正特性サーミスタ、２は凹部、３は
ブラシ基部、４はコミテータ、５は回転子巻線、
１０はモータ蓋板、１１はターミナル、１２はブ
ラシ、１３は軸受、１４はモータ軸、１５は回転
子コア、１６はモータ・ケース、１７は永久磁石
を表す。 Fig. 1 is a perspective view of one embodiment of the present invention, Fig. 2 is a vertical sectional view of the main part taken along arrow A-A in Fig. 1, and Fig.
The figure is a cross-sectional view taken along the arrow B-B in Figure 2.
The figure shows a configuration diagram of a well-known general small motor which is the premise of the present invention, and FIG. 5 shows an explanatory diagram for explaining the overheat prevention function by a positive temperature coefficient thermistor. In the figure, 1 is a positive temperature coefficient thermistor, 2 is a recess, 3 is a brush base, 4 is a commutator, 5 is a rotor winding,
10 is a motor cover plate, 11 is a terminal, 12 is a brush, 13 is a bearing, 14 is a motor shaft, 15 is a rotor core, 16 is a motor case, and 17 is a permanent magnet.

Claims

[Claims for Utility Model Registration] A stator has a permanent magnet for forming a field on the inner peripheral surface of a metal motor case with an opening at one end, and a plurality of rotor windings are wound around a rotor core. A commutator is provided with a rotating rotor and slides into contact with a pair of brushes for power supply supported by a synthetic resin motor cover plate fitted into the opening of the metal motor case. In a small motor configured to supply current to the rotor windings and equipped with a positive temperature coefficient thermistor for controlling the current to the rotor windings, the motor cover plate has a contact portion with the motor case. A recess for accommodating the positive temperature coefficient thermistor is provided, and a base of one of the pair of brushes is pressed between a bottom surface of the recess and a positive coefficient thermistor accommodated in the recess, and The motor cover plate is fitted into the opening of the motor case so that the motor is in contact with the motor case, and the positive temperature coefficient thermistor is connected from one pole of the power supply through the positive temperature coefficient thermistor and the motor case. A small motor equipped with a positive temperature coefficient thermistor, which is characterized by the fact that power is supplied to the brushes of the motor.