Braking controller of a three-phase permanent magnetic brushless DC motor for directly driving a screw pump
AssigneeMillennium Oilflow Systems & Technology Inc.
InventorsJun Liu, Yongjian Tang, Hengli Cong
Life of this patent
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Abstract
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.
Claims3
A braking controller of a three phase permanent magnet brushless direct current motor for direct drive screw pump comprises:
- detecting circuit for detecting the state of power supply of the three phase permanent magnet brushless direct current motor;
- braking circuit for controlling the starting of brake according to the state of power supply of the permanent magnet synchronous motor, characterized in that the braking circuit starts when no power is supplied to the motor and the motor rotates reversely driven by the screw pump.
Dependencies are inferred from the claim text.