Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1994-03-10
1997-03-04
Cabeca, John W.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318254, 318500, 360 7301, 388809, H02P 602
Patent
active
RE0354694
ABSTRACT:
A disc record/reproduce apparatus with a brushless dc motor having no separate dedicated position sensor, controls rotation of the dc synchronous motor by back-electromotive force signals developed in windings of the brushless dc motor using a/d converter included in one-chip microprocessor in the first mode, and controls by position and index signals recorded on the disc in the second mode. During start-up, a start-up oscillator is used. The control with a back-electromotive force signal is provided to enable the microprocessor to write a position signal on a disc and provided for inspecting the brushless dc motor independently. In the second mode, functions for executing the back-electromotive force control in the microprocessor is disabled during recording and reproducing of data to prevent overload on the microprocessor which is busy because of communication with an external computer and control of head position.
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patent: 4743815 (1988-05-01), Gee et al.
patent: 4814677 (1989-03-01), Plunkett
patent: 4867491 (1989-10-01), Squires et al.
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patent: 4928043 (1990-05-01), Plunkett
patent: 5130620 (1992-07-01), Inaji et al.
patent: 5235264 (1993-08-01), Kaneda et al.
Cabeca John W.
Victor Company of Japan Ltd.
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