Title :
Paralleling the stator coils in permanent magnet machines
Author :
Islam, Mohammad S. ; Mir, Sayeed ; Sebastian, Tomy
Author_Institution :
Delphi Corp., Holland, MI
Abstract :
As low voltage machines require smaller number of turns per phase compared to higher voltage machines, it is normal to connect the various stator phase coils in parallel to form the phase winding. The placement of various coil sides in the slot and the difference in the field produced by different poles of the rotor magnet can influence the induced voltage in various coils and the impedance of the coils. The difference in the induced voltages in the various parallel paths results in circulating current in the winding and causes increased losses in the machine. The unequal induced voltage and impedance causes unequal distribution of stator current in the various parallel paths and impacts the torque ripple contents. This paper discusses the effects of these unbalanced parallel paths on the machine performance
Keywords :
current distribution; permanent magnet machines; rotors; stators; torque; machine performance; permanent magnet machines; phase winding; stator current distribution; stator phase coils; torque ripple contents; Brushless machines; Coils; Impedance; Low voltage; Machine windings; Permanent magnet machines; Permanent magnets; Stator windings; Torque; USA Councils;
Conference_Titel :
Electric Machines and Drives, 2005 IEEE International Conference on
Conference_Location :
San Antonio, TX
Print_ISBN :
0-7803-8987-5
Electronic_ISBN :
0-7803-8988-3
DOI :
10.1109/IEMDC.2005.195916
