System Electromagnetic Loss Analysis and Temperature Field Estimate of a Magnetically Suspended Motor

Abstract

Abstract-A magnetically suspended permanent-magnet motor (MSPMM) system mainly consists of magnetic bearings (MBs), a motor and a rotor assembly. This paper focuses on the system analysis of an MSPMM used for a vacuum turbo-molecular pump (TMP). To ensure a normal levitation and rotation, characteristics of electromagnetic field of MBs and motor are studied. For MSPMM, loss is the main heat source. To ensure the safe and steady operation of MSPMM, loss of the MB and motor are calculated and analyzed by finite element method (FEM). For thermal aspects, temperature field is estimated. Based on these analyses, the system performance can be predictive. Considering the poor heat dissipation conditions in a vacuum environment, this system analysis including loss and temperature field is of great value for MSPMM design.

Vibration characteristics analysis of magnetically suspended rotor in flywheel energy storage system

“…Assuming the initial condition, (0) 0 x  , when three typical disturbance torques including transient impact torque, constant torque and harmonic torque are considered to apply separately onto the MSR, the tilting angle response of MSR can be calculated by solving Eq. (19)…”

Integrated Design and Optimization Method of an Asymmetric Hybrid Thrust Magnetic Bearing With Secondary Air-Gap

“…Magnetic bearings have numerous advantages over mechanical bearings, such as no friction, no abrasions, no lubrication, no maintenance, high speed, and high precision [1][2][3]. They have been widely applied in many areas, such as reaction wheels, control momentum gyros, energy storage flywheels, momentum wheels, high reliability compressors, molecular vacuum pumps, and robots [4][5][6][7][8][9][10][11][12][13].…”

Influence of Processing Location Hole on a Radial Magnetic Bearing Performance

“…There is no contact between the magnetic bearing stator and the rotor. Compared to the conventional mechanical bearings, MBs have many advantages, including no lubrication, no mechanical wear, and less maintenance [1][2][3][4][5][6].…”