| 摘要 |
PURPOSE:To shorten the rising time of a rotating speed and time up to stop by switching the connection of a winding formed of at least two or more coils per one phase in series or in parallel by a changeover switch according to the operating state. CONSTITUTION:A plurality (2 in the drawing) of coils U1, U2, V1, V2 and W1, W2 are connected through switches 1, 2;, 3, 4 and 5, 6 in 3 phases R-T to be controlled by a driving circuit 20. When the switches 1-6 are connected as shown, the coils U1-W2 are connected in series in the respective phases. When the switches 1-6 are connected to a contact oppositely to that as shown, the coils U1-W2 are connected in parallel in the respective phases. When the phase coils are connected in series, a large acceleration torque and a brake torque are generated. When the phase coils are connected in parallel, a high speed rotation is obtained. Thus, an efficient operation is performed by switching the phase coils in series or in parallel. |
