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.
Highlights
Integrated-starter-generator (ISG) motors as a key part of newenergy vehicles can simplify the structures of driving systems, reduce whole-vehicle weight and fuel consumption, and improve the quality of energy management [1]. e urgent problems of ISG design are how to reduce motor volume, save space, and improve the material utilization rate while meeting specific performance indices
A 42 kW water-cooled vehicular permanent magnet synchronous motor was analyzed via multiphysic coupling thermal performance simulation based on a circuit, electromagnetic field, and temperature field intercoupling analytical method [5]. e magnetic-thermal coupling of a 4 kW axial magnetic flux permanent magnet motor was analyzed [6]. e thermalmagnetic coupling of a double-salient-pole and double-rotor permanent magnet motor was analyzed by integrating thermal networks and the finite element method (FEM) [7]
Since the effect of the centrifugal force is reportedly far larger than other forces, here we only considered the centrifugal force when studying the mechanical structure strength of the rotor. ere were three hypotheses: (1) the forces of the rotor support were considered only when the motor was under the stable status and was thereby simplified, and the forces imposed on the steady-state motor maximized when the rotating speed was the largest; (2) the effect of temperature rise on the rotor was ignored; (3) the effect of motor vibration was ignored
Summary
Integrated-starter-generator (ISG) motors as a key part of newenergy vehicles can simplify the structures of driving systems, reduce whole-vehicle weight and fuel consumption, and improve the quality of energy management [1]. e urgent problems of ISG design are how to reduce motor volume, save space, and improve the material utilization rate while meeting specific performance indices. IPM motors are the most widely used types of vehicular permanent magnet motors and should meet the temperature rise requirement of motors and the mechanical structure strength of rotors while satisfying the electromagnetic performance of motors. The strength of a high-speed permanent magnet motor equipped with a solid cylindrical permanent magnet rotor was analyzed, and the rotor stress conditions were simplified into a planar stress problem, and thereby, the resolution equation of rotor mechanical structure strength was put forward [20]. E magnetic pole subsection axial magnetic flux permanent magnet motor rotor suitable for high-speed operation was structurally studied, and the resolution calculation model for rotor strength was built. E following three aspects are theoretical analysis of the main dimension design, stator winding temperature rise design, and mechanical structure strength of the rotor. E stator inner diameter and stator tooth width of motor are computed as follows [22]:
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
