Electricity: motive power systems – Positional servo systems – Limit or end-stop control
Patent
1989-03-13
1991-05-28
Ip, Paul
Electricity: motive power systems
Positional servo systems
Limit or end-stop control
318254, 318640, 235472, 235462, H02K 2908
Patent
active
050197649
ABSTRACT:
A lightweight hand-held scanning device for repetitively scanning a laser light source having a laser light generating means and at least one high speed scanning motor controlled by a resonant motor circuit which automatically controls the frequency and amplitude of oscillation of a high speed scanning motor. The frequency and amplitude control is accomplished by using a single feedback signal obtained from the windings of the motor which indicates resonance and which also measures the amplitude of oscillation. The feedback signal obtained is a second harmonic of the driving current. The circuit can be utilized to tune and maintain the motor in a resonant oscillating mode. By controlling both the frequency and amplitude of oscillation the high speed scanning motor can maintain a consistent scanning speed and use less power.
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Ip Paul
Symbol Technologies Inc.
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