Variable magnetization machine controller

A variable magnetization machine control system comprising:

• a controller configured to detect a magnetization state of a variable magnetization machine and carry out a control to change the magnetization state of the variable magnetization machine based on the detected magnetization state,
• the controller being further configured to output a control signal indicating a speed and a torque of the variable magnetization machine for controlling the speed and the torque of the variable magnetization machine, configured to output an ideal magnetization state of a low-coercive-force magnet of the variable magnetization machine based on the speed and the torque indicated by the control signal, and configured to adjust a shape of a d-axis current waveform and a shape of a q-axis current waveform in accordance with the ideal magnetization state of the low-coercive-force magnet of the variable magnetization machine to generate an adjusted d-axis current waveform and an adjusted q-axis current waveform that provide a driving voltage to drive the variable magnetization machine at a predetermined speed associated with the ideal magnetization state of the low-coercive-force magnet of the variable magnetization machine while maintaining the driving voltage below a predetermined maximum magnitude, and
• the controller being configured to adjust the d-axis current waveform and the q-axis current waveform by making slopes at leading and trailing edges of the d-axis current waveform and the q-axis current waveform for a high driving voltage more gentle relative to slopes at leading and trailing edges of the d-axis current waveform and the q-axis current waveform for a low driving voltage that is lower than the high driving voltage.

A variable magnetization machine control system comprising:

• a controller configured to detect a magnetization state of a variable magnetization machine and carry out a control to change the magnetization state of the variable magnetization machine based on the detected magnetization state,
• the controller being further configured to output a control signal indicating a speed and a torque of the variable magnetization machine for controlling the speed and the torque of the variable magnetization machine, configured to output an ideal magnetization state of a low-coercive-force magnet of the variable magnetization machine based on the speed and the torque indicated by the control signal, and configured to adjust a shape of a d-axis current waveform and a shape of a q-axis current waveform in accordance with the ideal magnetization state of the low-coercive-force magnet of the variable magnetization machine to generate an adjusted d-axis current waveform and an adjusted q-axis current waveform that provide a driving voltage to drive the variable magnetization machine at a predetermined speed associated with the ideal magnetization state of the low-coercive-force magnet of the variable magnetization machine while maintaining the driving voltage below a predetermined maximum magnitude, and
• the controller being configured to reduce a magnitude of the q-axis current waveform to generate the adjusted q-axis current waveform prior to increasing a magnitude of the d-axis current waveform.