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:
Mar. 16, 1993
Filed:
Feb. 27, 1991
David R Smith, Salem, VA (US);
Robert Villamil, Roanoke, VA (US);
Kollmorgen Corporation, Simsbury, CT (US);
Abstract
There is provided a linear current source amplifier for brushless DC motors with linear characteristic and low noise at high currents. A servo current loop for comparing a desired current with the actual winding current is provided to produce a global error signal. A plurality of linear current followers or power stages are configured such that each one of them is capable of providing a current to motor winding proportional to error signal. The power stages are arranged so that a local feedback signal proportional to the current supplied by the power stage is fed back and compared with a signal proportional to the global error signal to drive the current sources. The multiple power stage current sources in one embodiment are configured in a current loop fashion to energize the motor windings.