| 摘要 |
An electromagnetic brake system is described, the system comprising: an AC generator having an AC output terminal, the AC generator being configured to be engaged with a mechanical driving unit and configured to generate an output voltage at the AC output terminal in response to a rotation of the mechanical driving unit; an external power resistor assembly having an input terminal and an output terminal, the input terminal of the external power resistor assembly being connected to the AC output terminal; a power electronics circuit that is configured to control a current supplied by the AC generator to the external power resistor assembly, the power electronics circuit having an input terminal connected to the output terminal of the external power resistor assembly, the power electronics circuit comprising a plurality of controllable electronic switches; a control unit having an input terminal configured to receive a load signal, the control unit further being configured to: ■ determine, based on the load signal, a required amplitude and phase angle of the current supplied by the AC generator, and ■ generate a control signal for controlling the plurality of controllable electronic switches of the electronic circuit, based on the required amplitude and phase angle, and provide the control signal to the plurality of electronic switches, so as to obtain the current having the required amplitude and phase angle. |
