Motor control
AssigneeCypress Semiconductor Corporation
InventorNa ZHANG
Life of this patent
Estimating the term…
Abstract
According to some embodiments, a method for controlling a motor includes applying a first reference torque generating current parameter during a start-up mode to a motor in a stationary state, generating a demand torque generating voltage parameter based on the first reference torque generating current parameter, determining a feedback torque generating current parameter based on measured motor current in the stationary state, determining a phase resistance measurement of the motor based on the demand torque generating voltage parameter and the feedback torque generating current parameter, and controlling the motor in a speed control mode based on the phase resistance measurement.
Claims20
A method for controlling a motor comprising:
- applying a first reference torque generating current parameter during a start-up mode to a motor in a stationary state;
- generating a demand torque generating voltage parameter based on the first reference torque generating current parameter;
- determining a feedback torque generating current parameter based on measured motor current in the stationary state;
- determining a phase resistance measurement of the motor based on the demand torque generating voltage parameter and the feedback torque generating current parameter;
- and
- controlling the motor in a speed control mode based on the phase resistance measurement.
A motor controller comprising:
- a first controller configured to apply, in a start-up mode, a first reference torque generating current parameter to a motor in a stationary state;
- a second controller configured to generate a demand torque generating voltage parameter based on the first reference torque generating current parameter during the start-up mode;
- and
- a feedback unit configured to receive a three-phase motor current measurement responsive to the demand torque generating voltage parameter and transform the three-phase motor current measurement to determine a feedback torque generating current parameter, wherein:
- the first controller is configured to determine a phase resistance measurement of the motor based on the demand torque generating voltage parameter and the feedback torque generating current parameter;
- and
- the second controller is configured to control the motor in a speed control mode based on the phase resistance measurement.
A system, comprising:
- a motor;
- a current sense unit connected to the motor and configured to measure a motor current and generate a motor current measurement;
- and
- a motor controller, comprising:
- a first controller configured to apply, in a start-up mode, a first reference torque generating current parameter to the motor;
- a second controller configured to generate a demand torque generating voltage parameter based on the first reference torque generating current parameter during the start-up mode;
- and
- a feedback unit configured to receive the motor current measurement responsive to the demand torque generating voltage parameter and transform the motor current measurement to generate a feedback torque generating current parameter, wherein:
- the motor is stationary during the start-up mode;
- the first controller is configured to determine a phase resistance measurement of the motor based on the demand torque generating voltage parameter and the feedback torque generating current parameter;
- and
- the second controller is configured to control the motor in a speed control mode based on the phase resistance measurement.
Dependencies are inferred from the claim text.