| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent the life of an overload-protecting apparatus from being lost by limiting the single-phase constraint energization of a three-phase induction motor to one time even if phase interruption occurs in any phases in the protecting apparatus of a hermetically sealed electric compressor. <P>SOLUTION: One side of an operating coil 1L is connected to a neutral-point terminal 2N of one overload-protecting apparatus 2R, and at the same time the other of the operating coil 1L is connected between other overload-protecting apparatus 2T and a contact 1T of an electromagnetic contact apparatus 1 via a contact 5A of a reversal-preventing apparatus 5. Additionally, a resistor 5R of the reversal-preventing apparatus 5 is connected between the overload- protecting apparatus 12R and a contact 1S the electromagnetic contact apparatus 1, and at the same time a relay coil 5L of the reversal-preventing apparatus 5 is connected to the neutral-point terminal 2N of the other overload-protecting apparatus 2T. <P>COPYRIGHT: (C)2003,JPO |
