Small-sized DC motor
AssigneeNKK Corporation
InventorsKazuo Tajima, Keisuke Nakahara, Toshio Hinami, Hiromichi Saito, Yoko Okano
Life of this patent
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Abstract
A small D.C. motor (1) provided with a flat circular or square PTC thermistor (8) between an input terminal (7) and phosphor bronze plate (6) connected to the motor brush (5). The thermistor has electrodes on both faces and an opening provided substantially in its central portion, and it is fitted on the inside or outside of the motor casing (2). The motor shaft (9) or an extension thereof is passed through the opening in the thermistor in such a manner that the plate surface of the PTC thermistor (8) is nearly perpendicular to the shaft (9).
Claims10
A small-sized DC motor having a PTC thermistor as an over-load protective element comprising:
- said small-sized DC motor having a shaft and a motor casing;
- a plate-like PTC thermistor having an opening formed in a center thereof for increasing withstand voltage of said PTC thermistor, said thermistor being inserted over said shaft and mounted onto said motor casing;
- means for electrically connecting said plate-like PTC thermistor between an input terminal and a phosphorus bronze plate connected to a brush of said small-sized DC motor.
Dependencies are inferred from the claim text.