Analysis and Calculation of the Electromagnetic Field in Permanent Magnet Synchronous Motor Based on ANSYS

Permanent magnet (PM) synchronous motor has the magnet devices with variable shapes and location, so the electromagnetic field in PM synchronous motor is more complex. Finite element method (FEM) provides an accurate means of determining the electromagnetic field distribution, with due account magnetic saturation characteristics. With the ANSYS, the distribution of electromagnetic field in PM synchronous motor was analyzed and calculated. Through a prototype machine, no-load and load electromagnetic field in PM synchronous motor were obtained. When the PM synchronous motor was loaded, direct axis (d-axis) and quadrature axis (q-axis) armature reaction magnetic field were obtained. By back-dealing model of ANSYS, the pictures of magnetic flux density (B) and magnetic vector potential (A) were gained. Then back EMF of PM synchronous motor was figured out with two different means, and the calculation results were compared and analyzed, which are helpful for the design and performance analysis of PM synchronous motor.