Multiphysical-Domain Integration Design of Oil-Cooled Permanent Magnet ISG Motor

Abstract

Integrated-starter-generator (ISG) motors are a key part of new-energy vehicle dynamic systems. To more efficiently design higher-performance permanent magnet ISG motors, we proposed a multiphysical-domain integrated design method by designing the electromagnetism and thermal performance of motors and the mechanical structure strength of rotors together. A 48-slot and 8-pole oil-cooled permanent magnet ISG motor was designed by using this method and simulated via the finite element method. Also, a motor-testing platform was built to experimentally validate this method. The simulation results were consistent with the test results, which confirmed that the new method was accurate and effective and can be referred to during the practical design and development of high-density permanent magnet motors.

Analysis of the Rotor Magnetomotive Force of Built-In Radial Permanent Magnet Generator for Vehicle

“…Compared with the built-in tangential PMG, the permanent magnet steel (PMS) of the surface-mounted PMG and the built-in radial PMG is closer to the main air gap, and the distance between the PMSs is closer too, so there is less magnetic leakage between them. Moreover, compared with the surface-mounted PMG, the built-in radial PMG has high structural strength and high reliability and therefore has become the future development trend [4][5][6][7]. However, the rotor magnetic field of this generator is provided by two adjacent radial PMSs in series and therefore needs to pass through two PMSs.…”