Electricity: motive power systems – Motor-reversing – Automatic and/or with time-delay means
Patent
1986-08-11
1987-07-14
Shoop, Jr., William M.
Electricity: motive power systems
Motor-reversing
Automatic and/or with time-delay means
318257, 318283, 318293, 318480, H02P 122
Patent
active
046805133
ABSTRACT:
A control device for a reversible D.C. electric motor to protect it against damage upon reversal has a input switch circuit for reversing the flow of current through the motor's armature for reversing the direction of rotation of the motor, a first control circuit for preventing flow of current via the input switch circuit to the armature initially upon current reversing and a second control circuit for periodically interrupting the flow of current while the motor gains rotational speed after being reversed in relation to the magnitude of the flow of current through the armature. The first control circuit includes a detector circuit for determining the voltage drop existing across the armature and an automatic switch unit for (1) blocking flow of current from the input switch means to the armature until the voltage drop is determined by the detector circuit to be in a predetermined range and (2) allowing flow of the current while the voltage drop is determined to be within the range. Various circuits utilize light emitter/opto-coupler/light detector combinations.
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patent: 4412158 (1983-10-01), Jefferson et al.
patent: 4558259 (1985-12-01), Craig
patent: 4580082 (1986-04-01), Guerin-Pinaud
Harbor Branch Oceanographic Institute Inc.
Palmer Carroll F.
Ro Bentsu
Shoop Jr. William M.
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