Multi-Physical Field Analysis of Permanent Magnet Synchronous Motor for Servo Press

AC servo press has the advantages of high productivity, high flexibility, high precision, energy saving and environmental protection, and is the first choice for advanced forging and forming equipment. This paper intends to design and analyze a permanent magnet synchronous motor (PMSM) for servo press, which can meet the performance requirements of maximum torque, low moment of inertia and high efficiency heat dissipation. The finite element model(FEM) is established to study the electromagnetic field, stress field and temperature field of motor. The results show that the electromagnetic design of the motor meets the driving requirements of the servo press. The punching design reduces the rotor weight by 28.05%, and the structural strength of the rotor can ensure the safe and stable operation. Under the condition of high power-density and intermittent operation, the motor temperature rise is within the allowable range, and the motor operating temperature can be reduced by $13^{\circ}\mathrm{C}$ under the condition of independent fan forced air cooling.