Title :
Pole-changing permanent magnet machines
Author_Institution :
Hochschule fur Tech. & Wirtschaft des Saarlandes, Germany
Abstract :
Electric drives in which discrete speed control is required are today equipped exclusively with squirrel cage induction motors, due to the property of a squirrel cage to have always the same number of poles as the stator winding. Conventional permanent magnet (PM) machines have constant number of poles and can be operated from a constant frequency source only at one speed. If a PM machine is built after the principles of memory motors, one can change its number of poles as simply as in a squirrel cage machine. In the paper the principles of operation of a pole-changing memory motor are described, and its measured performance is analyzed and discussed.
Keywords :
control system analysis; discrete systems; equivalent circuits; machine control; machine testing; machine theory; magnetic circuits; motor drives; permanent magnet motors; variable speed drives; velocity control; discrete speed control; magnetic equivalent circuits; memory motors; performance analysis; performance measurements; pole-changing permanent magnet machines; Electric machines; Iron; Magnetic materials; Magnetization; Permanent magnet machines; Permanent magnet motors; Permanent magnets; Rotors; Stator windings; Torque;
Conference_Titel :
Industry Applications Conference, 2001. Thirty-Sixth IAS Annual Meeting. Conference Record of the 2001 IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-7114-3
DOI :
10.1109/IAS.2001.955982
