Method and apparatus for one wire motor speed and direction deco

Details Method and apparatus for one wire motor speed and direction deco Method and apparatus for one wire motor speed and direction deco

1993-12-06

1995-09-19

Shoop, Jr., William M.

Electricity: motive power systems

Positional servo systems

Digital or numerical systems

324165, G01P 3481

Patent

active

054518512

ABSTRACT:
A traction motor controller has a motor feedback employing motor-driven encoders producing signals in quadrature having a phase depending on motor direction and frequency according to motor speed. A logic encoder develops a single signal comprising a pulse train having a frequency dependent on motor speed and either of two amplitudes dependent on motor direction. A decoder at the controller has a circuit for producing a pulsed output at a frequency according to the encoded signal to indicate motor speed. Another decoder circuit uses a comparator to discriminate between the two amplitudes. The higher amplitude signal causes comparator output pulses which are converted to a steady state signal by a flip-flop which is clocked by delayed motor speed pulses.

REFERENCES:
patent: 4074339 (1978-02-01), Turnbull
patent: 4199800 (1980-04-01), Weit
patent: 4893085 (1990-01-01), Taruya et al.
patent: 5017850 (1991-05-01), Harada et al.
patent: 5345171 (1994-09-01), Simmons et al.

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