The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 1996
Filed:
Mar. 30, 1994
Ingo Richter, Markgroeningen, DE;
Klaus Skibowski, Sersheim, DE;
Robert Bosch GmbH, Stuttgart, DE;
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.