Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1984-03-12
1986-03-11
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318314, 318326, 318628, 318345A, 324161, 324162, 324163, H02P 500
Patent
active
045756643
ABSTRACT:
An electronic motor control system is taught herein which utilizes a tachometer check circuit. The tachometer check circuit is an electrical circuit which is interconnected with the output terminals of the tachometer. The circuit is utilized when the tachometer is at standstill to determine if the tachometer is functional, that is, is it internally correctly wired to produce an expected signal upon rotation. If such is the case, then motor start-up may take place. A second test is performed after motor start-up for determining if an appropriate amount of output voltage is being produced by the tachometer during the start-up phase. This is based on expected values of voltage during a short period of time after start-up. If such is not the case, the motor control system is disabled and the motor is stopped. The system is utilized for embodiments which include AC tachometers as well as DC tachometers used on unidirectional or bidirectional rotational systems.
REFERENCES:
patent: 3512128 (1970-05-01), Maki
patent: 3576485 (1971-04-01), Coons, Jr.
patent: 3588680 (1971-06-01), Athey
patent: 3733557 (1973-05-01), Fujinami
patent: 3790874 (1974-02-01), Klimo
patent: 3803425 (1974-04-01), Carp
patent: 4085363 (1978-04-01), Gravina et al.
patent: 4216419 (1980-08-01), Van Dam et al.
patent: 4275342 (1981-06-01), Kawada et al.
patent: 4506339 (1985-03-01), Kuhnlein
Ip Shik Luen Paul
Moran M. J.
Shoop Jr. William M.
Westinghouse Electric Corp.
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