| 摘要 |
This invention relates to the electricity supplying devices predicted for three-phase asynchronous motors, which are used in cars of railway transport. The purpose of the invention is to improve the reliability degree of protection operation of small-power motor (3) in case of phase loss. The device in question contains a voltage converter (1) from DC voltage to AC voltage with variable output frequency and voltage. The output terminal is connected to electric motors (2, 3) of various power provided with current protection system (5). The set purpose is reached by the following: to the circuit of small-power motor (3) is connected a current protection device (5), which reacts on current fails in one or two phases and switches off the contactor (4).
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