Open AccessSub‐assembly experiments to determine PWM supply‐induced losses in electric machines
Author(s) -
Godbehere Jonathan,
Hopkins Andrew,
Drury David,
Mellor Phil
Publication year - 2019
Publication title -
the journal of engineering
Language(s) - English
Resource type - Journals
ISSN - 2051-3305
DOI - 10.1049/joe.2018.8196
Subject(s) - stator , silicon carbide , pulse width modulation , voltage , thermal , materials science , inverter , capacitance , calibration , computer science , automotive engineering , control theory (sociology) , electrical engineering , electronic engineering , engineering , physics , electrode , control (management) , quantum mechanics , artificial intelligence , meteorology , metallurgy
This paper presents a low‐cost approach to experimentally characterise the effect of the inverter supply on the losses in an electrical machine. The set‐up comprises of representative subassemblies of the stator and winding, referred to as ‘motorettes’, and a single phase, fast switching silicon‐carbide‐based converter. The sub‐assembly‐based thermal analysis has been shown to be a time and cost‐effective method to examine winding loss, over a range of operating conditions. In addition to the slot to stator thermal resistance and capacitance. This provides critical information for thermal model calibration and produces more accurate thermal and loss predictions of the full machine behaviour. A test arrangement has been devised to replicate the magnetic excitation of the electrical machine stator during normal operation. This builds upon previous techniques, to allow iron loss to be investigated. Through multiple tests using DC, AC, and PWM‐AC supplies, a 20% increase in iron loss is observed due to PWM effects.