Sensorless trapezoidal motor control
AssigneeTexas Instruments Incorporated
InventorsRajan Lakshmi Narasimha, David P Magee
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Abstract
A method includes receiving a first measurement signal representing a first time between transitions of a motor commutation state. The method further includes receiving a second measurement signal representing a second time between transitions of a motor floating terminal voltage. The method further includes determining a motor speed state based on a combination of the first and second measurement signals, determining a motor commutation state based on the motor speed state and the motor floating terminal voltage; and providing a control signal to a motor inverter based on the motor commutations state.
Claims23
An apparatus comprising:
- a time measurement circuit having a first voltage transition input, a commutation state input, a first time measurement output, and a second time measurement output;
- a motor commutation controller having a signal measurement input, a second voltage transition input, a speed state input, and a commutation state output, the second voltage transition input coupled to the first voltage transition input, the commutation state output coupled to the commutation state input;
- a motor speed circuit having a first time measurement input, a second time measurement input, and a speed state output, the first time measurement input coupled to the first time measurement output, the second time measurement input coupled to the second time measurement output, and the speed state output coupled to the speed state input;
- and
- a motor inverter driver circuit having a motor control input coupled to the commutation state output of the motor commutation controller.
Dependencies are inferred from the claim text.