This paper will put the focus on the losses of power in electrical machines for HEV. Well designed permanent magnet synchronous machines (PMSM) have a grade of efficiency of over 90% at their nominal rating. PMSM for HEV are operated most of the time at low or no load conditions. At those operating points the machine will cause energy losses which have to be provided by the stored energy or by the combustion engine. There are in principle two different ways to reduce the waste of energy in PMSM. First step is to exercise measures in the design of PMSM reducing losses directly. Possible arrangements are well known but not easy to practice because of constructional constraints such as the size of those machines. Another way is to reduce losses by a special control strategy. This paper will zoom in on measures in the machine design which will help to reduce losses actively by applying a new strategy in controlling this kind of machines. As PMSM for HEV have to work at a wide range of speed it is usually necessary to apply a purely reactive current to weaken the flux at higher speeds. This causes losses in the copper of those PMSM. The amount of current needed for flux weakening depends on the inductivity in the direct axis. Increasing this inductivity provides good flux weakening capabilities. A new control strategy to diminish losses has been developed and will be presented. This strategy works for all kind of PMSM but will obtain best results together with PMSM designed for this kind of control. To achieve the above mentioned objectives a PMSM with special electrical behavior has been developed, build and analyzed at a wide range of operating points. This PMSM fulfills all requirements concerning passive means of loss reduction as well as the capability to reduce losses actively by a special control mechanism.
Minimization of losses of PMSM for HEV
Minimierung der Energieverluste von Dauermagnetsynchronmotoren für Hybridfahrzeuge
2009
8 Seiten, 13 Bilder, 4 Tabellen, 11 Quellen
Conference paper
Storage medium
English
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