LOAD-ADAPTIVE SMOOTH STARTUP METHOD FOR SENSORLESS FIELD-ORIENTED CONTROL OF PERMANENT MAGNET SYNCHRONOUS MOTORS

摘要

A field oriented control (FOC) system and method provides smooth field-oriented startup for three-phase sensorless permanent magnet synchronous motors (PMSMs) despite the absence of load information. The system uses the rotor flux projection on the d- or q-axis to determine whether the stator flux current reference being applied during reference startup phase is sufficient to spin the PMSM, thereby providing smooth operation during the reference startup phase and saving energy relative to applying rated current. The system also determines a suitable initial value for the stator torque current reference to use at the start of closed-loop sensorless FOC control mode based on an angle difference between the reference and estimated angles. Since this angle difference is reflective of the load on the PMSM, the selected initial value allows the system to achieve a smooth transition from reference startup mode to closed-loop sensorless FOC control mode.

主权项

1. A system, comprising:
a motor; and a controller configured to generate a control signal that controls a velocity of the motor during a reference startup operation and a closed-loop sensorless control operation, the controller being configured to generate the control signal for the reference startup operation based on a value of a stator flux current reference determined based on a rotor flux projection on a reference d-axis of a rotary framework coordinate system.