Method of and device for contactless measurement of rotary speed

Details Method of and device for contactless measurement of rotary speed Method of and device for contactless measurement of rotary speed

1994-03-30

1996-12-03

Strecker, Gerard R.

Electricity: measuring and testing

Electrical speed measuring

Including motor current or voltage sensor

324160, 364565, G01P 344, G01P 346

Patent

active

055811787

ABSTRACT:
A method of and an arrangement for rotary speed determination in an electric motor is used to determine an instantaneous motor rotary speed from an alternating portion of the current caused by switching on and off of the commutator with a recognizable periodicity. An endless auto-correlation sequence is formed, and the rotary value is determined from the distance between the maxima or minima of the auto-correlation sequence. In combination with a further method for rotary speed determination from the alternating portion of the current with the use of twice fourier transformations, a very reliable and error-free rotary speed determination is provided.

REFERENCES:
patent: 3404339 (1968-10-01), Mitchell
patent: 4684858 (1987-08-01), Ma et al.
patent: 4744041 (1988-05-01), Strunk et al.
patent: 5005144 (1991-04-01), Nakajima et al.
patent: 5424636 (1995-06-01), Rollwage et al.

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