1. MOE Key Lab of Nondestructive Testing, Nanchang Hangkong University, Nanchang 330063, China;
2. College of Information Engineering, Nanchang Hangkong University, Nanchang 330063, China;
3. Power Supply Service Management Center, Jiangxi Provincial Electric Power Co., Ltd., Nanchang 330077, China;
4. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
As for the problem of rotor strength analysis of the surface-mounted high speed permanent magnet machine with a non-magnetic alloy sleeve, the analytical solution of rotor strength was proposed based on the plane stress model of elastic mechanics. The displacement method in polar coordinate was employed to deduce the analytical solution, and the influences of the static interference fit, rotational speed and temperature gradient of rotor were taken into account in the analytical solution proposed. Then the effectiveness of the analytical solution was validated by finite element simulations and experiments, respectively. Finally, the influences of design parameters including sleeve thickness, static interference fit, rotational speed and rotor temperature on rotor stress were further investigated based on the analytical solution proposed. The simulations and experiments show that the analytical solution proposed can accurately calculate the radial stress, hoop stress and equivalent Mises stress of the rotor of surface-mounted high speed permanent magnet machine, considering the influence of temperature gradient. High speed centrifugal force and rotor heating result in significant increasing of the tensile stress in permanent magnets, meanwhile, the equivalent Mises stress of non-magnetic alloy sleeve also increases. The pre-pressure of the permanent magnet can be improved by appropriately increasing the static interference fit and sleeve thickness, so as to protect permanent magnets from the tensile stress produced by high speed centrifugal force and rotor heating.
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