| 摘要 |
PURPOSE:To facilitate starting by effecting step drive of an electric motor through extreme crawling rotation when it is decided that the electric motor is not in a normal starting state during the starting of the start of a compressor and when it is decided that the compressor is filled with a liquid refrigerant. CONSTITUTION:In a device wherein a scroll type compressor arranged to the upper part of the interior of a closed case is driven through operation of a DC electric motor 25 arranged to the inner lower part of a closed case, a drive circuit 10 comprising an inverter circuit is connected to exciting coils U, V, and W in respective layers mounted on the stator of a DC electric motor 25. A rotation detecting means 1 indirectly detecting a counter electromotive force generated at each exciting coil along with rotation of a rotor 29 and detecting whether the electric motor 25 is in a rotation state and a deciding means 2 to decide whether the compressor is filled with a liquid refrigerant are connected, in the order named, to the drive circuit 10. Based on outputs therefrom, step drive of the electric motor 25 is effected at extreme crawling rotation at one full turn or less per one second by means of a control circuit 8. |
