Method for smooth motor startup
AssigneeCarrier Corporation
InventorsDa Zhang, Thomas Gietzold, Subbarao Varigonda, Salih Baris Ozturk
Life of this patent
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Abstract
A method of conducting smooth motor startup is provided and includes operating a motor in an open loop control scheme at startup, operating the motor in a closed loop sensorless control scheme at a time after startup and transitioning between the open loop control scheme and the closed loop control scheme by reducing a difference between an estimated rotor angle of the motor and a commanded ramping angle of the motor.
Claims20
A method of conducting smooth motor startup, the method comprising:
- operating a motor in an open loop control scheme at startup;
- operating the motor in a closed loop sensorless control scheme at a time after startup;
- and
- transitioning between the open loop control scheme and the closed loop control scheme by reducing a difference between an estimated rotor angle of the motor and a commanded ramping angle of the motor.
A method of operating a permanent magnet synchronous motor (PMSM) compressor for smooth motor startup, the method comprising:
- operating the PMSM in an open loop control scheme at startup;
- operating the PMSM in a closed loop sensorless control scheme at a time after startup;
- and
- transitioning between the open loop control scheme and the closed loop control scheme by determining a difference between an estimated rotor angle and a commanded ramping angle and controlling the commanded ramping angle to reduce the difference.
A method of operating a permanent magnet synchronous motor (PMSM) compressor for smooth motor startup, the method comprising:
- operating the PMSM in an open loop control scheme at startup with a predefined load condition;
- operating the PMSM in a closed loop sensorless control scheme at a time after startup;
- and
- transitioning between the open loop control scheme and the closed loop control scheme by determining a difference between an estimated rotor angle and a commanded ramping angle and controlling the commanded ramping angle to reduce the difference to zero.
Dependencies are inferred from the claim text.