Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1985-02-07
1987-01-20
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318345D, 318331, 318332, 318345H, 363123, H02P 516
Patent
active
046382267
ABSTRACT:
A motor (M) supplied by AC full-wave voltage is controlled by a triac (Q2) under the control of a double-time constant triggering circuit which has a speed setting branch (R3-C2) connected at the triac (Q2) side of the motor (M) and the other time constant branch (R1-C1) connected at the supply side of the motor (M) to provide a feedback function as well as a first time constant. A unidirectional diode (D1) is incorporated in the feedback sensing time constant branch for rendering feedback signals only on alternate half cycles to prevent oscillation and overcompensation of motor speed due to the feedback signal. A soft-start circuit, usable also in half-wave applications, is incorporated in the branch containing adjustable speed setting resistor and comprises a transistor (Q3) having its collector-emitter circuit connected in series with the adjustable resistor (R3). A resistor (R4)-capacitor(C3) time constant circuit is provided to supply time variable current to the base of the transistor (Q3) through a resistor (R5) for causing the transistor (Q3) to gradually conduct, thereby gradually decreasing its resistance and therefore gradually increasing the firing angle of the triac (Q2).
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G. E. Controlled Rectifier Manual, First Edition, Mar. 20, 1960.
Economy Power Semiconductor Applications by F. W. Gutzwiller and E. K. Howell G.E. p. 16.
Damiano Michael A.
Schmerda Richard F.
Searing Lawrence G.
Eaton Corporation
Ip Shik Luen Paul
Rowe D. A.
Shoop Jr. William M.
Vande Zande L. G.
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