Commutatorless motor drive device

Abstract

Abstract PURPOSE:To enhance controllability, by forming a reference voltage for controlling a central point voltage of a stator winding from a motor power source voltage, and providing the constitution so that the reference voltage varies in association with the fluctuation of the motor power source voltage. CONSTITUTION:When the center point voltage Vc of the stator winding 1 becomes higher than the reference voltage Vr of a voltage dividing circuit 3, the error output signal from a comparator 4 becomes small, and a current control circuit 5 tends to decrease the current between the positive terminal of the motor power source 2 and the stator winding 1. Therefore the impedance of the circuit is increased and the circuit 5 operates so as to decrease the voltage Vc. When the Vc becomes lower than Vr, the error output voltage from the comparator 4 becomes large, the impedance of the circuit 5 becomes small and operates so as to increase the Vc. Therefore, the central point voltage Vc is controlled so that it becomes equal to the referene voltage, i.e. half the output voltage Vm of the motor power source 2. Even though the motor power source voltage Vm is fluctuated due to the load fluctuation, the maximum torque can be outputted, and the controllability is improved.

Inventors

• 👤 Takuji Kadota
• 👤 門田　卓治
• 👤 Shingi Yokobori
• 👤 横堀　進義

Bibliographic Details