Abstract
This paper evaluates the applicability of a newly proposed method for the indirect efficiency determination of permanent magnet synchronous machines by measuring individual losses. Similar methods are well-known and standardized for other kinds of electrical machines, but for permanent magnet synchronous machines, only the direct measurement of input and output power is standardized for efficiency determination according to IEC 60034-2‑1. Measurements and finite element simulations are carried out for four selected test machines with a rated power range between 45 kW and 90 kW and with different stator and rotor topologies. It is shown that the proposed method is well applicable for permanent magnet synchronous machines with a distributed integer-slot stator winding. For machine designs with more rotor losses such as motors with tooth coil windings and open stator slots, larger deviations between the direct and indirect efficiency values of up to one percentage point are determined at rated load conditions.
Highlights
Permanent-magnet synchronous machines usually have low load-dependent rotor losses due to air gap field space harmonics, as the rotor is laminated and the magnets are segmented
In [7] a novel procedure of an indirect efficiency determination of permanent-magnet synchronous machines was proposed in collaboration with the German standardization committee DKE/K 311
The proposed method for indirect efficiency determination is based on the assumption that the iron losses under load can be determined from the no-load iron losses of the machine via (1)
Summary
Permanent-magnet synchronous machines usually have low load-dependent rotor losses due to air gap field space harmonics, as the rotor is laminated and the magnets are segmented. For efficiency values of about 95–96% and above, which are possible with permanent-magnet synchronous machines, the direct procedure becomes inaccurate due to the limited accuracy of power measurement. In [7] a novel procedure of an indirect efficiency determination of permanent-magnet synchronous machines was proposed in collaboration with the German standardization committee DKE/K 311. The evaluation of four different permanentmagnet synchronous machines with a rated power between 45 kW and 90 kW is shown in addition by means of measurement and numerical simulations This allows a recommendation, for which kind of permanent-magnet synchronous machine the proposed method is mostly suitable
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