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:
Jun. 27, 2000
Filed:
Mar. 08, 1999
Michael E Mitchell, Austin, TX (US);
David A Hayner, Austin, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A motor controller includes an input terminal (22), a frequency selective network, a first controller, and a second controller. The input terminal is adapted to be coupled to a drive phase of a motor (16) for receiving a signal (24). The frequency selective network (18) has an input coupled to the input terminal (22) and an output for providing a first signal representative of the back EMF signal within a frequency range corresponding to a predetermined harmonic frequency above a primary frequency thereof. The first controller (20) has an input coupled to the output of the frequency selective network (18) and an output for providing a second signal representative of a position or a velocity of a rotor of the motor (16). The second controller (10) has an input coupled to the output of the first controller (20) and an output for providing a third signal. The third signal indicates how the motor (16) is to be driven.