Title :
The effect of PWM on rotor eddy-current losses in high-speed permanent magnet machines
Author :
Jumayev, S. ; Merdzan, M. ; Boynov, K.O. ; Paulides, J.J. ; Pyrhonen, J. ; Lomonova, E.
Author_Institution :
Electr. Eng., Eindhoven Univ. of Technol., Eindhoven, Netherlands
Abstract :
In last decades, interest on high-speed permanent magnet (PM) machines has grown significantly due to their high efficiency, high power factor and high power density. However, a weak point of these machines is a risk of magnet demagnetization since rare-earth permanent magnets are sensitive to temperature [1]. The main reason of temperature increase in the rotor are eddy current losses, which are induced by time harmonics in stator currents and spatial harmonics due to windings distribution. Additionally, rotor eddy current losses can considerably decrease the machine efficiency.
Keywords :
demagnetisation; eddy current losses; permanent magnet machines; power factor; pulse width modulation; rotors; stators; PWM effect; demagnetization; high-speed permanent magnet machines; power density; power factor; pulse width modulation; rare-earth permanent magnets; rotor eddy-current losses; spatial harmonics; stator currents; winding distribution; Analytical models; Eddy currents; Finite element analysis; Harmonic analysis; Permanent magnets; Pulse width modulation; Rotors;
Conference_Titel :
Magnetics Conference (INTERMAG), 2015 IEEE
Conference_Location :
Beijing
Print_ISBN :
978-1-4799-7321-7
DOI :
10.1109/INTMAG.2015.7157112
