Methods and apparatuses for obtaining maximum magnetic flux of permanent magnet synchronous motors

摘要

A method of obtaining a maximum magnetic flux of a permanent magnet synchronous motor may comprise: receiving a first command voltage from a current controller to control current applied to the permanent magnet synchronous motor; receiving an on/off duty ratio of a control pulse signal to control an output voltage of an inverter that drives the permanent magnet synchronous motor, the on/off duty ratio being determined based on the first command voltage; generating a second command voltage corresponding to the output voltage to be output from the inverter based on the on/off duty ratio of the control pulse signal; obtaining a maximum command voltage error by comparing the first and second command voltages; and/or obtaining the maximum command magnetic flux of the permanent magnet synchronous motor according to a position of a rotor of the permanent magnet synchronous motor based on the maximum command voltage error.

主权项

1. A method of obtaining a maximum magnetic flux of a permanent magnet synchronous motor, the method comprising:
receiving a first command voltage from a current controller to control current applied to the permanent magnet synchronous motor; receiving an on/off duty ratio of a control pulse signal to control an output voltage of an inverter that drives the permanent magnet synchronous motor, the on/off duty ratio being determined based on the first command voltage; generating a second command voltage corresponding to the output voltage to be output from the inverter based on the on/off duty ratio of the control pulse signal; obtaining a maximum command voltage error by comparing the first and second command voltages; calculating in real time a maximum output voltage of the inverter according to a position of a rotor of the permanent magnet synchronous motor, based on the position of the rotor and a direct current (DC)-link voltage of the inverter; and obtaining the maximum command magnetic flux of the permanent magnet synchronous motor according to the position of the rotor based on the maximum command voltage error and the maximum output voltage of the inverter.