Study on the Peripheral Magnetic Leakage and Shielding Measures of Surface-mounted Permanent Magnet Motor

Permanent magnet (PM) motors are widely used in our daily lives. Taking a surface-mounted PM motor as an example, a magnetic circuit model considering the peripheral magnetic flux leakage is established. Maxwell software is used to simulate different loads and thicknesses and the materials of the shielding layers. The magnetic flux leakage around the motor has a sinusoidal distribution in the space. The value of the magnetic flux leakage is inversely proportional to the power of $P+1$ from the surface of the core. The thicker the shielding layer, the smaller the magnetic leakage. The greater the relative permeability of the shielding layer, the better the shielding effect. The results provide ideas and recommendations for the magnetic flux leakage analysis and the design of non-magnetic or low magnetic motors.