DRIVING DEVICE FOR VARIABLE SPEED MOTOR

摘要

PURPOSE:To suitably control a main motor and a fan driving motor in response to the environmental temperature of the main motor by providing a high temperature sensor and a low temperature sensor, respectively performing specified operations. CONSTITUTION:A high temperature sensor 18 for detecting the temperature of a load driving main motor 1 operated at a variable speed arriving at the first specified temperature and stopping the energization of the main motor controlling current is provided at a variable speed motor having the motor 1 and a fan driving motor 12 independently controlled. Further, a low temperature sensor 19 for detecting the temperature of the main motor 1 arriving at the second specified temperature to drive the motor 12 and detecting the temperature of the motor 1 becoming the third specified temperature lower than the second specified temperature to stop the motor 12 is provided.