| 摘要 |
PURPOSE: A three-phase power supply circuit is provided to prevent a three-phase pressure device from operating in a reverse direction by automatically switching sequence according to rotation direction after determining the sequence of three-phase which is supplied. CONSTITUTION: A three-phase power supply circuit is formed between a plugboard (10) for outputting power of three-phase, A, B and C for phase difference of 120 degree respectively, and a rotation section (20) for receiving the power from the plugboard (10). The three-phase power supply circuit includes a sequence determining section (30) for producing a signal after determining the sequence of each phase using the power outputted from the plugboard (10), and a three-phase switching section (40) for supplying the sequence to the rotation section (20) after switching the power sequence of specified two phases outputted from the plugboard (10) according to the signal of the sequence determining section (30) and the rotation direction of the rotation section (20).
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