Control method and control system for screw pump |
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| 申请号 | US14706791 | 申请日 | 2015-05-07 | 公开(公告)号 | US09976555B2 | 公开(公告)日 | 2018-05-22 |
| 申请人 | DELTA ELECTRONICS, INC.; | 发明人 | Lon-Jay Cheng; | ||||
| 摘要 | A control method is used with a control system to control a screw pump. The control system includes an electric motor and a motor drive. The control method includes following steps. Firstly, a DC bus voltage is monitored. If the DC bus voltage is smaller than a first threshold value, a potential energy stored in the pump screw and released by a backspin action is converted into a regenerative electrical energy so as to maintain a normal operation of the motor drive. Then, the motor drive drives the electric motor to control the backspin action of the screw pump according to a backspin torque limit strategy. If the electrical power from the power source is not restored and the level of a reverse regenerative torque is smaller than a preset torque value, the backspin action of the screw pump is stopped freely. | ||||||
| 权利要求 | |||||||
| 说明书全文 | |||||||
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