| 摘要 |
PURPOSE:To increase both starting torque and synchronizing torque by changing the phase difference angle of induced voltage in a rotor conductor at the time of starting and synchronized rotation. CONSTITUTION:A motor is started by closing a power supply in a condition that stator windings 21, 22 are connected so as to obtain a zero phase difference angle of induced voltage in rotor conductors 31, 32 at the time of starting. Here starting torque is increased because no flow of current is generated in a diode 34 by allowing a current in the rotor conductor to flow so as to recirculate in the rotor conductor 32 from the rotor conductor 31. When a rotational speed approaches the synchronous speed, phase difference between two rotational magnetic fields, generated by the rotor conductors 31, 32, is set at 180 deg.. In this way, the current is recirculated through the diode 34 by stopping the recirculation to the rotor conductor 32 from the rotor conductor 31. Thus by forming a magnetic pole in a rotor core, it is rotated while being pulled by a rotational magnetic field generated by the stator windings 21, 22. |
