Lock detector for series motor with commutator

Abstract

Abstract PURPOSE:To detect the locking of a motor with a simple circuit construction by detecting the voltage with a polarity opposite to that of the motor power supply generated by the inductance that the motor armature winding has, using a circuit for detecting a zero revolution. CONSTITUTION:If an armature 7 falls into a locking state as the result of the heavy load applied to a motor 2, a voltage with a polarity opposite to that of the voltage applied to the motor 2 is generated at both the ends of the armature 7 because of its own inductance. The voltage opposite in polarity is supplied to a light emission diode 10 in a circuit 3 for detecting a zero revolution via a diode 9, resistors 12, 13, and a smoothing condenser 11. Then, light by means of the light emission diode 10 is detected by a phototransistor 14, and judged 20 via an integrating circuit 16. By so doing, it is possible to obtain a lock detector with a simple circuit construction and stable operation.

Inventors

• 👤 Hiroshi Yasojima

Bibliographic Details