| 摘要 |
Variable speed drive comprising a main rectifier module ( 10 ) including thyristors (K 1 , K 2 , K 3 ) to power a main continuous bus ( 15 ) from an external power network ( 5 ), an inverter module ( 30 ) delivering a variable control voltage to an electric motor from the main bus ( 15 ), an auxiliary rectifier module ( 20 ) connected to the external power network ( 5 ), an electronic control unit ( 50 ) controlling the thyristors, a powering module ( 29 ) supplying the control unit ( 50 ) from the auxiliary rectifier module ( 20 ) and from the main rectifier module ( 10 ). According to the invention, a switching device ( 40 ) controlled by the control unit ( 50 ) is used to disconnect the powering module ( 29 ) and the auxiliary rectifier module ( 20 ).
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