| 摘要 |
PURPOSE:To perform a control without a position detector of an accurate polyphase commutatorless motor by compensating the voltage reduction due to the interference of a commutation from other coil set to a line voltage of each motor, thereby obtaining an accurate speed electromotive force. CONSTITUTION:Coils U1-W1 and U2-W2 are displaced and arranged at 30 deg. of an electric angle from each other, are independently energized via convertersI, II, but are magnetically coupled. In this polyphase commutatorless motor, a voltage reduction occurs at the line voltage of a motor due to the interference of a commutation between the coil set (U1-W1) and the coil set II (U2-W2). In order to compensate for the voltage reduction, a component of -KdIw2/dt is, for example, obtained from a compensator 53 in the coil set voltage VWU1 of the motor, is subtracted by the line voltage VWU1 of the motor together with the commutation reactance drop and the coil resistance drop obtained through a differentiator 51 and a coefficient unit 52 from motor currents IW1, IU1, thereby obtaining a speed electromotive force EWU1. |
