| 摘要 |
PURPOSE:To control a current without losing a damping characteristic by high- frequency switching a phase converting switching element of the side connected with a coil in a nonexciting mode to control a duty. CONSTITUTION:When a motor winding A phase is in an excited state, a power transistor (Tr)9, Tr8 are conducted, and a current flows in a direction of an arrow. Then, the Tr8 of the side not connected with a motor winding E-phase during nonexcitation is switched, and the Tr9 is continuously turned ON. With this drive, the both ends of the motor winding E-phase of nonexcited state is shortcircuited by the power transistors Tr9 and Tr1, a braking is effectively performed, and damping characteristic is not lost. |
