Quantized speed control of a stepper motor

Details Quantized speed control of a stepper motor Quantized speed control of a stepper motor

H - Electricity

02

P

318/18

H02P 8/00 (2006.01) H02P 8/14 (2006.01)

Patent

CA 1164930

QUANTIZED SPEED CONTROL OF A STEPPER MOTOR Abstract A coded disk is coupled to a stepper motor to control the speed of the latter. On the periphery of the coded disk are a plurality of equidistant marks, the sensing of each of which generates a motor control pulse. One motor control pulse produces one motor step. Previously, motors have been decelerated by delaying the initiation of the motor control pulses. This is disadvantageous if the speed fluctations occurred prior to the initiation of a motor control pulse, in that the optimum deceleration angle of the motor could not be maintained. In accordance with the invention, several fine marks are provided on the coded disk for each motor step and a motor control pulse is emitted only when a selected one of the fine marks has been sensed. This leads to motor control pulses with rigid angles, and speed fluctations prior to the emission of such pulses no longer produce negative effects. The invention is suitable for the print head control of metal paper printers.

359532

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