Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1975-03-04
1976-10-26
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328155, 307265, 307273, 328 58, H03K 118
Patent
active
039886859
ABSTRACT:
A motor speed control system in which the rotor output frequency is filtered to remove slot noise and applied to one or more frequency discriminator units (FDU's) which provide control signals to operate relays which control contactors in a conventional motor controller having rotor speed control resistances. Each FDU compares the input frequency with its own setpoint frequency and operates to change rotor circuit resistance if the input frequency differs from the setpoint by a predetermined amount. The rotor signal is separated into two rectangular wave signals, one of which triggers a monostable circuit. The Q and Q monostable outputs are compared with the input in logic circuit means which produces a relay driving output under specified signal time-overlap conditions. A feedback signal changes the duty cycle of the monostable when the output is provided, thereby establishing a frequency "dead band" bracketing the setpoint. A "low signal" circuit insures a predetermined state of the FDU under low level or zero frequency conditions. The output operation can be reversed for counter torque motor deceleration applications.
REFERENCES:
patent: 3304439 (1967-02-01), Stratton et al.
patent: 3340951 (1967-09-01), Vitt
patent: 3441342 (1969-04-01), Ball et al.
patent: 3521174 (1970-07-01), Naubereit et al.
patent: 3646370 (1972-02-01), Lowe
patent: 3706935 (1972-12-01), Hughes
Electronics - Circuit Designer's Casebook, Copyright 1972, McGraw-Hill Book Co.
Harvey Hubbell Incorporated
Heyman John S.
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