Title :
Low frequency pulsating emissions from space vector PWM drives
Author :
Enohnyaket, Mathias
Author_Institution :
Bombardier Transp., Vasterås, Sweden
Abstract :
Low frequency common mode current pulsations were found on the ac link of a space vector modulated drive. The pulsations enhance emissions at the switching frequency and generates low frequency emissions. These common mode pulsations could be injected into electric machines through the distributed capacitances; potentially triggering high frequency motor bearing currents and bearing ware, as well as heating issues. This paper presents measurements showing the low frequency common mode pulsations, and a theoretical characterization of the source. Finite element computation of the distributed stray capacitances of a given PM motor is presented.
Keywords :
PWM power convertors; electric drives; electric machines; finite element analysis; machine bearings; switching convertors; ac link; bearing currents; bearing ware; common mode pulsations; distributed capacitances; distributed stray capacitances; electric machines; finite element computation; high frequency motor; low frequency common mode current pulsations; low frequency pulsating emissions; space vector PWM drives; space vector modulated drive; switching frequency; Capacitance; Current measurement; Pulse width modulation; Rotors; Stator windings; Switches; Space vector modulation; bearing currents; common mode currents; finite element modeling; low frequency pulsating emissions; stray capacitances;
Conference_Titel :
Vehicle Power and Propulsion Conference (VPPC), 2011 IEEE
Conference_Location :
Chicago, IL
Print_ISBN :
978-1-61284-248-6
Electronic_ISBN :
Pending
DOI :
10.1109/VPPC.2011.6043251
