| 摘要 |
PURPOSE: To obtain an electric automobile which can run comfortably by switching the stator windings in series or parallel to feed each stator winding with a current for rotating the rotor and/or a field current for increasing the magnetic force of the rotor thereby varying the rotation and torque continuously from a low level to a high level. CONSTITUTION: When a transition is made from region 2, an operation similar to that in the region 2 is performed in region 4, i.e., the stator windings are connected in series by a windings switching means and only a rotating current is fed to each stator winding from a current supply means. Torque T2 corresponds to the starting torque of vehicle on a flat land. When a transition is made from region 3 or 1 to region 2, the stator windings are connected in parallel by the winding switching means and a combination current of rotating current and field current is fed to each stator winding from the current supply means. Consequently, the number of switching times of winding can be decreased and the vehicle is not subjected to impact every time when the speed is changed. |
