초록 ▼

A surface-mounted permanent magnet synchronous machine drive 10 and a method 30 of controlling the machine drive. Flux weakening and current regulating loops 70, 60 cooperate to provide automatic transition to the flux weakening mode (operation above base speed), regardless of DC bus voltage, load o

A surface-mounted permanent magnet synchronous machine drive 10 and a method 30 of controlling the machine drive. Flux weakening and current regulating loops 70, 60 cooperate to provide automatic transition to the flux weakening mode (operation above base speed), regardless of DC bus voltage, load or other operating conditions. This feature provides significant performance improvement. No look-up tables are used in the flux weakening loop. The on-set point for flux weakening is automatically adjusted, and may be changed through software. An appropriate d-axis current component is injected over the entire speed range, providing the maximum available torque (which corresponds to the q-axis current component). The control method works with fixed frequency current compensators.

대표청구항 ▼

[ What is claimed is:] [9.] A method of controlling a permanent magnet synchronous motor, comprising the steps of:determining a torque producing current command;comparing the torque producing current command to measured torque producing current to determine an error signal;controlling torque produci

[ What is claimed is:] [9.] A method of controlling a permanent magnet synchronous motor, comprising the steps of:determining a torque producing current command;comparing the torque producing current command to measured torque producing current to determine an error signal;controlling torque producing current to the motor in response to the error signalin response to the error signal, determining a flux weakening current command; andcontrolling flux weakening current to the motor in response to the flux weakening current command.