Dynamic Performance Analysis of Line Start Interior Permanent Magnet (IPM) Synchronous Motor for Pumping Systems

Line operated Induction Motor (IM) has been traditionally used for pumping systems. This paper presents the transient behavior of a 1-hp, 3-phase, 4-pole line start interior permanent magnet (IPM) synchronous motor for high inertia loads like centrifugal and reciprocating pumps. The interior permanent magnet motor has squirrel cage rotor windings and the magnets are inserted underneath the cage. In this paper, a dynamic d-q model of the motor is implemented and also the load torque characteristics of the pumps have been analyzed. The start-up and synchronization performances of the IPM motor for the load variations have been obtained using MATLAB. Simulation results illustrate that line start interior IPM (LSIPM) motor has good starting capability, high efficiency and high torque density. This paper also depicts that LSIPM motor runs in constant speed irrespective of the change in loads during operation.