| 摘要 |
PURPOSE:To rapidly stop in emergency a synchronous motor by integrally constructing a plurality of yokes provided at an equal interval around a shaft provided at the center of a stator, and shortcircuiting the drive voltage input line of the motor. CONSTITUTION:When a malfunction occurs, switches SW1-SW3 are simultaneously tilted down to the lower side in the drawing. As a result, three drive voltage input lines of a synchronous motor 10 are accidentally shortcircuited. The current which flows through the coil of the stator 1 at this moment rises at the time constant of the coil impedance, and the variation in the magnetic flux generated at the stator 1 side introduces the variation in the magnetic flux in a magnetic circuit in the yokes 2-1-2-6 at the rotor side. Accordingly, since the yokes 2-1-2-6 are formed in an integral structure, large eddy current loss is generated, and is operated as the initial braking energy. |
