| 摘要 |
PROBLEM TO BE SOLVED: To provide a motor drive with enhanced operability by varying the constant of a bridge detection circuit that performs feedback detection of the rotational speed of a motor based on the temperature of the motor. SOLUTION: An electronic variable resistor 30 is placed on one side of the bridge circuit 26 connected with the motor 28, and further a temperature sensor 38 for detecting the temperature of the motor 28 is installed. CPU 20 detects the temperature of the motor 28 through the temperature sensor 38, acquires a resistance value of the electronic variable resistor 30 appropriate to this temperature from among the data in ROM 40, and changes the resistance value of the electronic variable resistor 30 to the acquired resistance value. |
