| 摘要 |
PURPOSE:To increase the torque in a low-speed region and to improve the efficiency, by causing the rectified current to flow to a rotor by means of diodes interposedly provided to rotor conductors. CONSTITUTION:Diodes 8 and 9 are interposedly provided at rotor conductors, so that the current rectified in half-wave flows to the rotor conductors. Consequently, it is hard for the rotor conductors to be affected by the inductance and the current is prone to flow to the rotor conductors. The power factor is therefore improved as compared with the case where AC current is caused to flow, and the torque in low-speed region increases. When a rotor rotates, the polarity of DC distributed current contained in the short current is alternated in every half a rotation and the stator winding produces a rotating magnetic field in proportion to the rotating speed of the rotor. On this account, the torque by the rotating field where the power source frequency is at synchronized speed and the torque by the rotating field in proportion to the rotating speed are overlapped, so that the total torque is increased. |
