07667423 is referenced by 20 patents and cites 72 patents.

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.

Title
Control systems and methods for permanent magnet rotating machines
Application Number
12/121392
Publication Number
7667423 (B2)
Application Date
May 15, 2008
Publication Date
February 23, 2010
Inventor
Michael I Henderson
West Yorkshire
GB
Joseph G Marcinkiewicz
St. Peters
MO, US
Arthur E Woodward
Manchester
MO, US
Prakash B Shahi
St. Louis
MO, US
Agent
Harness Dickey & Pierce
Assignee
Emerson Electric Co
MO, US
IPC
G05B 19/10
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