Enhancing The Performance Of Permanent Magnet Synchronous Motor With Damper Winding

ABSTRACT

This thesis is centered on enhancing the performance of Permanent Magnet Synchronous Motor with damper windings. The MATLAB/SIMULINK function program that makes use of the Runge-Kutta fourth order numerical method to solve a set of first order differential system of equations describing electrical and mechanical models was developed. MATLAB m-files were developed and used to solve the Runge-Kutta fourth order method for both transient and steady state respectively. The transient motor differential equations are expressed in rotor reference frame with flux linkage as state variables. The motor used in this thesis is a 3-phase, 1.0 KW, 50Hz, 8-pole, 230V permanent magnet synchronous motor. The dynamic behaviors of the motor under varying voltages (230V, 208V and 255V) and varying stator resistance (0.6Ω and 1.2Ω) were studied. By digital simulation of the resulting differential equations, typical transient responses of the motor were represented. Results reveal that increase in voltage leads to increase in motor speed and rotor torque. Also, at lower stator load resistance, the motor possesses initial peak magnitude of the rotor speed and motor torque (545 rad/s and 200Nm) respectively. But at high value of the stator load resistance, the motor attains a maximum load angle of 15.50.