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Effect of voltage subharmonics and interharmonics on currents of line start permanent magnet synchronous motor

Gnaciński Piotr, Pepliński Marcin

Technical Transactions

2024

Vol. 121, iss. 1

art. no. e2024023

This study deals with currents of a line start permanent magnet synchronous motor (LSPMSM), supplied with voltage containing subharmonics and interharmonics – components of the frequency less than the fundamental frequency or not being equal to its integer multiple, respectively. The results of experimental investigation are presented for a factory-made four-pole LSPMSM of the rated power 3 kW. Voltage interharmonics result in the flow of current components of various frequencies and comparatively small values. Their presence could lead to resonance phenomena, but is not expected to cause the motor overheating. Contrastingly, voltages subharmonics cause the flow of significant current subharmonics, which may considerably increase power losses, and consequently – the thermal loads of the LSPMS.

Wpływ podharmonicznych na obciążenie cieplne silnika indukcyjnego

Gnaciński P., Pepliński M., Szweda M.

Maszyny Elektryczne : zeszyty problemowe

2009

Nr 84

97-101

One of most important energy receivers is an induction cage machine. It can work properly provided that it is supplied with balanced, sinusoidal voltage of appropriate frequency and rms value. Presence of any power quality disturbances leads to additional power losses and to an increase in windings temperature. Higher temperature of windings means faster aging of insulation system. Consequently, power disturbances may cause premature destruction of a machine. One of power quality disturbances that may result in machine overheating, are subharmonics. Their thermal impact on an induction cage machine was usually investigated with simulation method that has been not verified in the previous works. In this paper results of thermal calculations were compared with results of measurements. It was pointed out that the method used in previous works for calculations of thermal impact of subharmonics, causes underestimation of windings temperature.