Patent ID: 6366049
Filing Date: 2002-04-02
Classification: H02P

Abstract:
A speed controller system for an electrical motor comprising:an electrical motor; a source of a speed demand signal; a current sensor circuit connected to the electrical motor to provide a motor current signal; a phase/current (PI) controller circuit connected to the current sensor circuit and responsive to the motor current signal for providing a ramp step signal; a ramp function generator circuit having a first input connected to the source of a speed demand signal and a second input connected to the output of the phase/current (PI) controller circuit, the ramp function generator providing a speed ramp having slope initiated by the speed demand signal and which is adjusted in response to a ramp step signal from the phase/current (PI) controller circuit, the ramp function generator also providing a frequency signal wherein the ramp function increases or decreases the frequency according to the speed demand.