| 摘要 |
PURPOSE:To perform commutation stably, by a method wherein phase difference between terminal voltage and no-load induced voltage and field current are controlled according to armature current, and a vector arithmetic unit to control amount of the terminal voltage is installed. CONSTITUTION:A power factor angle command circuit 18 commands lead angle of armature current with respect to terminal voltage of a motor 3, and a no-load terminal voltage command circuit 19 commands terminal voltage of the motor 3 at no-load state. A vector arithmetic unit 20 receives command of the power factor angle command circuit 18 and the no-load terminal voltage command circuit 19 and armature current detection signal as input, and outputs field current command and phase command of a converter 2. On the basis of command of a phase detector 4 and the vector arithmetic unit 20, a phase control circuit 21 controls conduction phase angle of the power converter 2. |
