Abstract
Recently Line Start Permanent Magnet Motor (LSPM) is a well-known motor due to its technical advantages in academic and industrial sector. The LSPM combines a permanent magnet rotor that allows higher motor efficiency during synchronous operation, and an induction motor squirrel cage rotor for starting the motor by connecting it directly to an A.C. Source. In this paper, we will deal with the efficiency and Power factor improvement of a 3.4kW, 2-pole, three-phase LSPM. The efficiency improvement can be effectively achieved by designing optimization of the rotor structure using response surface methodology (RSM) and finite element method. The optimized slot shape of PM was selected for the prototype machine, which improves the efficiency and power factor of LSPM. LSPM has a higher efficiency than (IM) and an advantage in constant speed operation regardless of the effect of load variation. It has permanent magnets (PMs) buried bellow the squirrel cage in rotor, thus operates in steady state as conventional interior permanent magnet synchronous motor (PMSM). Thus it combines the advantages of induction motor (robust construction and line-starting capability) and PMSM (high efficiency, power factor and torque density). The line start permanent magnet motor (LSPM) is noted as alternative routes comparing with the induction motor that it offers high efficiency and unity power factor [1].
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