Method of aligning a stationary rotor of a synchronous motor at a configured rotor angle and a controller therefor
AssigneeKinetic Technologies International Holdings LP
InventorFeng Zhu
Life of this patent
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Abstract
Described is a method of aligning a stationary rotor of a polyphase synchronous motor having a permanent magnet rotor to a configured rotor angle (θ). The method includes determining corresponding polyphase drive voltages for the synchronous motor based on a user-specified value of a two-axis synchronously rotating reference frame vector voltage (V) for a selected one of two axis of the two-axis synchronously rotating reference frame. Then, determining corresponding polyphase drive voltages for the synchronous motor; and applying said polyphase drive voltages for a predetermined, selected, or calculated time period to rotate the stationary rotor to align said rotor with said configured rotor angle (θ).
Claims21
A method of aligning a rotor of a polyphase synchronous motor having a permanent magnet rotor to a user-configured rotor angle (θ), the method being applied after the rotor has stopped synchronous operation and has become stationary and is no longer being driven and prior to closed-loop synchronous start-up of the motor, the method comprising the steps of:
- receiving a user-configured rotor angle (θ);
- based on said received user-configured rotor angle (θ), deriving a two-axis vector voltage (V) defined in a synchronously rotating reference frame aligned to the user-configured rotor angle (θ);
- transforming the two-axis vector voltage into corresponding polyphase drive voltages for the synchronous motor using an inverse Park transform;
- and
- applying said polyphase drive voltages for a calculated time period, the time period being calculated to rotate the stationary rotor from an arbitrary initial position to the user-configured rotor angle (θ) to align the stationary rotor with said user-configured rotor angle (θ).
A method of starting a synchronous motor having a permanent magnet rotor, the method being applied after the rotor has stopped synchronous operation and has become stationary and is no longer being driven and prior to closed-loop synchronous start-up of the motor, the method comprising the steps of:
- receiving a user-configured rotor angle (θ);
- based on said received user-configured rotor angle (θ), deriving a two-axis vector voltage (V) defined in a synchronously rotating reference frame aligned to the user-configured rotor angle (θ);
- transforming the user-specified two-axis vector voltage (V) into corresponding polyphase drive voltages for the synchronous motor using an inverse Park transform;
- and
- applying said polyphase drive voltages for a calculated time period, the time period being calculated to rotate the stationary rotor from an arbitrary initial position to the user-configured rotor angle to rotate the stationary rotor to align said rotor with said user-configured rotor angle (θ) and
- controlling start-up of the motor using a closed-loop synchronous operation motor control algorithm based on the user-configured rotor angle (θ).
A closed-loop controller for a synchronous motor having a permanent magnet rotor, said controller comprising a non-transitory computer-readable medium storing machine-readable instructions and a processor, wherein, when the machine-readable instructions are executed by said processor, they configure the controller to park the stationary rotor at a configured rotor angle (θ) by:
- receiving a user-configured rotor angle (θ);
- based on said received user-configured rotor angle (θ), deriving a two-axis vector voltage (V) defined in a synchronously rotating reference frame aligned to the user-configured rotor angle (θ);
- transforming the two-axis vector voltage into corresponding polyphase drive voltages for the synchronous motor using an inverse Park transform;
- and
- applying said polyphase drive voltages for a calculated time period, the time period being calculated to rotate the stationary rotor from an arbitrary initial position to the user-configured rotor angle (θ) to align said rotor with said user-configured rotor angle (θ).
A method of aligning a stationary rotor of a polyphase synchronous motor having a permanent magnet rotor to a user-specified rotor parking angle (θ), the method being applied after the rotor has stopped synchronous operation and has become stationary and is no longer being driven and prior to synchronous closed-loop start-up of the motor, the method comprising the steps of:
- receiving a user-specified rotor angle (θ);
- based on said received user-specified rotor angle (θ), deriving a two-axis vector voltage (V) defined in a synchronously rotating reference frame aligned to the user-specified rotor angle;
- transforming the two-axis vector voltage (V) into corresponding polyphase drive voltages for the synchronous motor using an inverse Park transform;
- and
- applying said polyphase drive voltages for a calculated time period, the time period being calculated to rotate the stationary rotor from an arbitrary initial position to the user-specified rotor angle (θ) to align said rotor with said user-specified rotor angle (θ).
Dependencies are inferred from the claim text.