Patent ID: 6013996
Filing Date: 2000-01-11
Classification: G05B,G05D

Abstract:
An improved stop control system for a motor having a drive mechanism wherein the motor is coupled to a motor controller that controls the speed and position of the drive mechanism using a first signal indicative of a commanded position of the drive mechanism, a second signal indicative of the actual speed of the drive mechanism and a third signal indicative of the actual position of the drive mechanism, said improved stop control system comprising:a first circuit receiving said first signal and said third signal for generating an error signal indicative of a difference between said first signal and said third signal;a second circuit coupled to said first circuit, said second circuit receiving said error signal and comparing said error signal with a threshold position error to generate a switch control signal as a result of such comparison; anda switch having a signal input coupled to the motor for receiving said second signal and having a control input coupled to said second circuit for receiving said switch control signal, said switch further having an output coupled to the motor controller, said switch operating to control coupling of said signal input to said output using said switch control signal, wherein said signal input is coupled to said output at least whenever said error signal is less than said threshold position error so that the motor controller can use said second signal in conjunction with said third signal to stop the motor.