公开(公告)号：EP2053246A9

公开(公告)日：2009-07-15

申请号：EP06775289.9

申请日：2006-08-04

申请人： Liu, Jun ,  Tang, Yongjian ,  Cong, Hengli ,  Direct Drive PCP Inc.

发明人： Liu, Jun ,  Tang, Yongjian ,  Cong, Hengli ,  Direct Drive PCP Inc.

IPC分类号： F04B49/06

CPC分类号： F04B49/06 ,  F04C18/16 ,  F04C28/06 ,  H02P3/22

摘要： A braking controller of a three-phase permanent magnetic brushless DC motor for directly driving a screw pump includes a detection circuit for detecting power supply states of the three-phase permanent magnetic brushless DC motor and a braking circuit for controlling the braking startup according to the power supply states of the three-phase permanent magnetic brushless DC motor. When the motor is supplied with power, the braking circuit is cut off. When the motor is not supplied with power and the screw pump drives the motor to reverse, the braking circuit starts up.