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:
Feb. 23, 2010
Filed:
May. 15, 2008
Prakash B. Shahi, St. Louis, MO (US);
Arthur E. Woodward, Manchester, MO (US);
Joseph G. Marcinkiewicz, St. Peters, MO (US);
Michael I. Henderson, West Yorkshire, GB;
Prakash B. Shahi, St. Louis, MO (US);
Arthur E. Woodward, Manchester, MO (US);
Joseph G. Marcinkiewicz, St. Peters, MO (US);
Michael I. Henderson, West Yorkshire, GB;
Emerson Electric Co., St. Louis, MO (US);
Abstract
Systems and methods for controlling a rotating electromagnetic machine. The rotating machine, such as a permanent magnet motor or hybrid switched reluctance motor, includes a stator having a plurality of phase windings and a rotor that rotates relative to the stator. A drive is connected to the phase windings for energizing the windings. A controller outputs a control signal to the drive in response to inputs of demanded torque, rotor position and/or speed. Control methods include calculating a scaled torque demand from the received torque demand to obtain substantially constant torque over a range of motor speeds, calculating an optimal dr-axis injection current using a cost function and a starting method that switches from speed control mode to torque control mode at a predetermined rotor speed or at predetermined start-up timing intervals.