| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, when a compressor load torque variation is small, optimal torque control cannot be performed since a motor rotating position corresponding to a piston of a compressor cannot be identified. ! SOLUTION: A driving device comprises: a reciprocal compressor 105 including a reciprocation-type compression element 104; a synchronous motor 103 including a permanent magnet for driving the compression element 104 in its rotor; and an inverter 102 which causes an alternating current to flow to the synchronous motor 103 and varies a rotation speed to vary a refrigeration capability of the compressor. In the case where a reference rotation position of the synchronous motor 103 during one rotation cannot be determined, a rotation speed of the synchronous motor 103 is shifted down and load torque variations are intentionally increased. Thus, the reference rotation position can be surely detected and torque control can be stably operated. ! COPYRIGHT: (C)2014,JPO&INPIT |
