Study On Low Noise Pm Servo Motor And Its Control Circuit Used In Direct Driving Front Load Washers

Electric machines convert electrical energy into mechanical energy to provide the power of a direct driving washing machine. Washing and spinning are the most important operating points in the washing machine. The washing mode requires the minimum speed with maximum torque and the spinning mode demands the maximum speed with minimum torque.The design of suitable electrical motor used for washing machine was focused on the permanent magnet synchronous motor(PMSM). Furthermore, the interior permanent magnet synchronous motor(IPMSM) was used as designed models. The permanent magnets(PM) are burred into the rotor as V-shape and Radial shape. Additionally, Nd Fe B and Ferro were used to provide the second energy in the designed models.The influences by using Nd Fe B and Ferro in IPMSM models was developed. The efficiency of V-shape PMSM using Nd Fe B and Radial shape PMSM using Ferro was calculated in two operating points of washing machine. The total cost of IPMSM motor was directly affected by the unit price of permanent magnets.Based on the electrical machine software designer, Ansfot Maxwell 2D was used to draw and simulate the two IPMSM models. Magnetostatic solver and transient solver were selected as solution type during the model design to solve the static magnetic field and the time varying magnetics fields. The no load test and full load test was carried out to determine the magnetic flux density at different parts of IPMSM motor, the back-EMF voltage, the electromagnetic torque and so one.Because the PM servomotor should be low noise, the analysis and reduction of noise in IPMSM models were developed. In this thesis work, the analysis was focused on the superposition of cogging torque and torque ripple in electromagnetic torque. The amplitude of those torques was depended on the geometry of stator core and rotor core. It was verified, that an optimal geometry in the PMSM model reduces the amplitude of those undesirable torques and can contribute on the reduction of noise.The control principle of PMSM motor was developed in two systems such as hardware system and software system. The hardware system was designed by using Altium designer software. However, the software system was written in MPLAB software. The combination of both systems was realized and the test was done.A simulation of control system using IPMSM motor was implemented in Matlab/Simulink. The Field Oriented Control(FOC) was used to control the IPMSM model. The optimization of some parameters was done. It was verified that, an accurate result was obtained during the control system.The experiment was done at laboratory of small and special Electrical Machines and Control, HIT. Two PMSM motors were tested. The tests were carried out on the determination of PMSM parameters, characteristics and response.