Research On Novel Hybrid Excitation Starter And Generator For ISG

It is represented by hybrid vehicle ISG of Honda Motor, which is made ofpermanent magnet synchronous motor with high power density, small size, highefficiency. However, there are some drawbacks of PMSM. Weakening control requires ahigh d-axis current, so that the magnetic field waveform in air gap is deteriorated. Theresult is the greater copper loss and iron loss is produced than normal. If the ISGcontroller is out of control in the high-speed power generation, the back electromotiveforce would exceed the safe voltage and damage electrical equipments in the car.Therefore, on the basis of sufficient investigation and research, a novel hybrid excitationISG is studied. The characteristics of this motor are easy to adjust the air gap magneticfield and strong flux-weakening capability. Especially, there is no problem of excessiveback electromotive force, after the controller is out of control. There is a good prospectin hybrid vehicles used as ISG.In the paper, the optimal design of a novel hybrid excitation ISG was studied.Three different kinds of pole and slot cooperation, different magnetic materials,permanent magnetic and electric field configuration, and the rotor structure optimizewere contrasted and analyzed. The reasonable optimization of design scheme wasconfirmed. Then the new hybrid excitation ISG was researched through multi-domainsimulation analysis. The iron loss analysis model of motor was set up. And the iron losssimulation and calculation were made. The stress field of the motor was analyzed byanalytical method and finite element simulation, to ensure the security of themechanical structure of the motor. To reduce the stress and deformation, some measureswere proposed. For each part of the motor, particularly the temperature sensitivematerial, the temperature of the simulation analysis was made, to provide a basis forreducing the motor temperature rise. Through field-circuit co-simulation, as a generator,the load performance of hybrid excitation synchronous motor was assessed. Finally, onthe basis of optimization design, a hybrid excitation synchronous machine was createdand some field tests were made. The wide range of adjustable magnetic ability, as agenerator of external characteristic and adjustment characteristic, and the startingcapability as a motor were verified.