Analysis of Cogging Torque of PM Motor with Radial Magnetic Field and Parallel Magnetic Field

Abstract

This paper provide two methods to analyze the cogging torque of PM motor with radial magnetic field and parallel magnetic field, FEM method and Analytic method. The FEM model and Analytic model of PM motor with radial magnetic field and parallel magnetic field are founded. We analyze the model in both methods. From the result of analysis. The air-gap magnetic density of PM motor can be analyzed. We can find the cogging torque of radial magnetic field PM motor is much heavily than the cogging torque of parallel magnetic field PM motor. The result of Analytic method is close to the result of FEM method. The Analytic method is useful in analyze the cogging torque of PM motor.

Research on Magnetic Characteristics and Fuzzy PID Control of Electromagnetic Suspension

“…To analyze the quasi-parallel magnetic field in the air gap between the PM ring arrays and the inner wall of the actuator, the mathematical model of the magnetic flux density of the magnet field is built in the y direction according to the Ampere molecular circulation hypothesis, as shown in Figure 4. When the positive direction of the magnet field is +y direction, the spatial magnetic field is equivalent to the magnetic field generated by Surface Currents 1 and 2 [36,37]. A schematic diagram of the magnetic field of a single PM ring is shown in Figure 4.…”