Speed controller of magnetic motor
AssigneeHitachi Industrial Equipment System Co., Ltd.
InventorsKazuaki TOBARI, Yasuo Notohara, Wataru Hatsuse, Dongsheng Li, Kentaro Oi, Yuuji Funayama
Life of this patent
Estimating the term…
Abstract
The invention relates to a speed control method of a magnetic motor and is capable of providing a speed controller of the magnetic motor realizing highly stable, highly efficient and highly responsive control characteristics even around critical torque of the motor. When an excessive torque command value (or a q-axis commanded current value) greater than a torque maximum value (or a q-axis current) that can be outputted by the motor is required, an input of speed control is limited so that the q-axis commanded current value does not increase up to a limit value.
Claims15
A speed controller of a magnetic motor for:
- calculating d-axis and q-axis commanded voltage values, the d-axis and the q-axis corresponding respectively to a magnetic flux axis and a torque axis, and the d-axis and q-axis commanded voltage values being calculated based on d-axis and q-axis commanded current values, d-axis and q-axis detected current values and a detected speed values, the d-axis commanded current value set to zero and the q-axis commanded current value calculated from a deviation of a commanded speed value from the detected speed value, and
- controlling an output voltage value from a power converter for driving the magnetic motor in accordance with the calculated d-axis and q-axis commanded voltage values,
- the speed controller limiting a speed control input to keep the q-axis commanded current value from increasing to an upper limit value if a commanded torque value to request a greater torque than a maximum torque is requested, the commanded torque value corresponding to the q-axis commanded current value and the maximum torque which corresponds to the maximum detected q-axis current and can be outputted by the magnetic motor.
A speed controller of a magnetic motor for:
- calculating d-axis and q-axis commanded voltage values, the d-axis and the q-axis corresponding respectively to a magnetic flux axis and a torque axis, and the d-axis and q-axis commanded voltage values being calculated based on d-axis and q-axis commanded current values, d-axis and q-axis detected current values and a detected speed values, the d-axis commanded current value set to zero and the q-axis commanded current value calculated from a deviation of a commanded speed value from the detected speed value, and
- controlling an output voltage value from a power converter for driving the magnetic motor by changing a commanded phase value in accordance with a deviation of the q-axis commanded current value from the q-axis detected current value if the output voltage value from the power converter is limited,
- the speed controller limiting a speed control input to keep the q-axis commanded current value from increasing to an upper limit value if a commanded torque value to request a greater torque than a maximum torque is requested, the commanded torque value corresponding to the q-axis commanded current value and the maximum torque which corresponds to the maximum q-axis detected current and can be outputted by the magnetic motor.
Dependencies are inferred from the claim text.