DC motor assembly with step adjusting control arrangement

  • US 8,547,049 B2
  • Filed: 09/10/2010
  • Issued: 10/01/2013
  • Est. Priority Date: 05/18/2010
  • Status: Active Grant
First Claim
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1. A method of controlling a rotational speed of an output shaft of a motorized unit by a DC motor assembly, comprising the steps of:

  • (a) driving an optical grating to rotate corresponding to a rotational movement of said output shaft, wherein said optical grating has a plurality of light transmissible portions and a plurality of light blocking portions alternating with said light transmissible portions, such that said light transmissible portions and said light blocking portions are phase shifting when said output shaft is start rotating;

    (b) sending out an impulse signal by a photocoupler in responsive to a phase shift between said light transmissible portion and said light blocking portion of said optical grating;

    (c) controllably driving said output shaft to be rotated and stopped in a sequent manner as a stepping movement thereof in responsive to said impulse signal so as to controllably adjust said rotational speed of said output shaft; and

    (d) controllably adjusting an angular rotational movement and number of revolution of said output shaft in responsive to said impulse signal, wherein the step (d) further comprises a step of configuring said impulse signals as numerical values that when said numerical values reach a preset threshold, said output shaft is completely stopped rotating, and when said numerical values is below said preset threshold, said output shaft repeatedly controlled to be rotated and stopped in a sequent manner until said numerical values reach said preset threshold.

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