| 摘要 |
PURPOSE:To drive and control equivalently a synchronous motor to a DC motor by detecting the phase of the induced electromotive force of a rotary field synchronous motor to generate a current command having the same phase as the detected phase and flowing an armature current of the same phase as the induced electromotive force in an armature coil. CONSTITUTION:The field pole position of a synchronous motor 101 is detected by a resolver 102, and sintheta and costheta are outputted from a synchronization rectifier 103. Further, the difference between the actual speed from a tachometer generator 104 and the speed command is applied to an error amplifier 106, the output of the amplifier is multiplied by the sintheta and costheta, thereby obtaining a current command, the command is then passed through a 2-phase to 3-phase converter 109, and is added to the actual current, thereby controlling the power transistors Q1-Q6 of an inverter 105. Accordingly, the induced electromotive force is detected from the position of the field pole and the armature current having the same phase as the detected phase is supplied to an armature coil. Thus, the torque equivalent to a DC motor can be produced from the induction motor. |
