Title :
Pole-changing permanent-magnet machines
Author_Institution :
Hochschule fur Technik & Wirtschaft des Saarlandes, Saarbrucken, 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 the squirrel cage to always have the same number of poles as the stator winding. Conventional permanent-magnet (PM) machines have a 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 this paper, the principles of. operation of a pole-changing memory motor are described, and its measured performance is presented and discussed.
Keywords :
induction motor drives; permanent magnet motors; squirrel cage motors; stators; 8-6-4- pole PM machine; constant frequency source; memory motors; pole-changing memory motor; pole-changing permanent-magnet machines; remagnetization; squirrel-cage induction motors; squirrel-cage machine; stator winding; Drives; Electric machines; Induction machines; Industry Applications Society; Permanent magnet motors; Poles and zeros; Rotors; Stator windings; Torque; Velocity control;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2002.805568
