Electricity: motive power systems – Synchronous motor systems – Braking
Patent
1982-01-29
1984-04-03
Smith, Jr., David
Electricity: motive power systems
Synchronous motor systems
Braking
318314, 318757, H02P 318
Patent
active
044410620
ABSTRACT:
A missing pulse detector circuit is disclosed which includes a variable frequency VCO and a digital phase comparator. The phase comparator compares the phase of the VCO reference and the phase of a driving signal that drives a synchronous motor drive package. The output of the phase comparator is input to a loop filter to provide an error signal that controls the VCO frequency and phase. A second output on the phase comparator translates a phase difference into a pulse width. The pulse width is then input to an integrator circuit to delay the leading edge thereof. This delayed pulse is then input to a Schmidt trigger which provides a switching threshold. The output of the Schmidt trigger is utilized to inhibit the operation of a synchronous motor in the motor drive package. The missing pulse detector is operable to detect rapid increases in acceleration of the driving frequency and added or deleted pulses therein. When either of these conditions is present, an inhibit signal removes the drive from the synchronous motor and a restart procedure is initiated.
REFERENCES:
patent: 3458823 (1969-07-01), Nordahl
patent: 4042873 (1977-08-01), Cox
patent: 4047231 (1977-09-01), Gargnon
Evans William E.
Gillett Jimmie D.
Howison Gregory M.
Medlock Nina
Mills Jerry W.
Smith Jr. David
Varo Inc.
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