Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Patent
1979-01-26
1981-03-24
Rubinson, Gene Z.
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
318254, 318138, H02P 602
Patent
active
042582997
ABSTRACT:
A single pickup head generates an alternating signal proportional to the rotational speed of a DC motor which can be rotated in either of two directions, and such alternating signal is employed by speed and/or phase control circuits to control the motor speed relative to a reference speed in a selected one of the two directions. An overspeed sensing circuit detects speed runaway, which can occur when the motor is rapidly rotated in the direction opposite to the selected direction, and the overspeed sensing circuit then interrupts the motor drive voltage until the motor speed decreases to below its normal speed. At and below normal speed in the undesired direction, the normal torque acts in the selected direction to rapidly reverse the direction and to accelerate the motor to normal speed in the selected direction.
REFERENCES:
patent: 2724081 (1955-11-01), De La Source
patent: 3221235 (1965-11-01), Scholl
patent: 3221236 (1965-11-01), Scholl
patent: 3903463 (1975-09-01), Kanamori
patent: 3953776 (1976-04-01), Wolf
patent: 4076999 (1978-02-01), Edwards et al.
Hoshimi Susumu
Sato Toshio
Takeda Masashi
Eslinger Lewis H.
Redman John W.
Rubinson Gene Z.
Sinderband Alvin
Sony Corporation
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