Device for detecting rotational speed of a motor using first and

Details Device for detecting rotational speed of a motor using first and Device for detecting rotational speed of a motor using first and

1987-12-07

1989-07-11

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Electrical speed measuring

Speed comparing means

324166, 324173, 324175, 318254, 388933, H02P 500, G01P 336, G01P 356

Patent

active

048475556

ABSTRACT:
A device for detecting the rotational speed of a motor by a first rotational speed sensor and at least a second rotational speed sensor and a switch unit connected to the rotational speed sensors, the switch unit selecting signals from one of the sensors within a respective given rotational speed range.

REFERENCES:
patent: 3573619 (1971-04-01), Yoliet, III
patent: 4216419 (1980-08-01), van Dam et al.
patent: 4228396 (1980-10-01), Palombo et al.
patent: 4229695 (1980-10-01), Bassi
patent: 4246536 (1981-01-01), Bradley et al.
patent: 4560927 (1985-12-01), Ishida et al.

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