| 摘要 |
A switch arrangement 400 is provided for an electric motor or generator 500 having a plurality of coil windings that during operation of the electric motor or generator 500 are electrically coupled to form a star point connection and that are arranged to have different AC voltage phases applied across the respective coil windings from an inverter. The switch arrangement 400 includes a rectifier Da-Df arranged to be coupled to the respective plurality of coil windings, and the rectifier Da-Df provides the rectified AC current to a DC output Idc. A switch QA coupled across the rectifier DC output Idc is operable to electrically isolate the plurality of coil windings from each other to provide protection in the event of a short circuit in the inverter. Unwanted currents and braking torque of the motor 500 are prevented by a single switch QA. A voltage clamping device 430 may be connected in parallel with the switch QA to absorb energy from the coil windings. |
