Patent ID: 6366043
Filing Date: 2002-04-02
Classification: B60L,H02P,Y02T

Abstract:
A control system for use in controlling a torque-controlled permanent magnet synchronous motor drive comprising:a slew-rate limiter that processes an input torque command to produce a modified torque command that is input to the motor drive; a controller coupled to the slew-rate limiter and the motor drive for dynamically limiting the input torque command applied to the motor drive and its rate of increase; and wherein the controller comprises: first and second multipliers that square error signals output by the motor drive; an adder coupled to the multipliers that sums the squared error signals; an integrator coupled to the adder that integrates the sum of the squared error signals to produce a root mean square (RMS) value of the current control error signal; and a threshold comparator for comparing the RMS value of the current control error signal to low and high threshold values and for generating a slew rate control signal that is input to the slew rate limiter to limit the torque command input to the motor drive.