DC motor assembly with step adjusting control arrangement
First Claim
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; and
(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.
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Accused Products
Abstract
A DC motor assembly includes a motorized unit for generating a rotatable power at an output shaft, and a step adjusting control arrangement including an optical grating and a photocoupler. The optical grating, which is operatively coupled at the output shaft, has a plurality of light transmissible portions and a plurality of light blocking portions alternating with the light transmissible portions. The photocoupler is activated to send out an impulse signal in responsive to a phase shift between the light transmissible portion and the light blocking portion of the optical grating, wherein the output shaft is controllably driven to be rotated and stopped in a sequent manner as a stepping movement thereof in responsive to the impulse signal so as to controllably adjust the rotational speed of the output shaft.
8 Citations
24 Claims
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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:
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(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; and (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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A DC motor assembly, comprising:
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a motorized unit, which is adapted for electrically connecting with a DC power source, comprising an output shaft for generating a rotatable power; a step adjusting control arrangement, which comprises; an optical grating, which is operatively coupled at said output shaft, having a plurality of light transmissible portions and a plurality of light blocking portions alternating with said light transmissible portions; and a photocoupler being activated to send out an impulse signal in responsive to a phase shift between said light transmissible portion and said light blocking portion of said optical grating, wherein said output shaft is controllably driven 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. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification