Theory And Simulation Research Of Pmsm With Opposite Rotation Dual Rotors

As a special structured motor, the double rotor reverse turn on permanent magnetsynchronous motor, compared with the traditional motors, has the advantages ofcompacter structure, higher utilization rate of stator cores, higher power density anddouble driving. Double rotor reverse turn on permanent magnet synchronous motorhas stator rotor structure; the magnetic fields around the two stators rotate reversely.It can be applied to underwater contra-rotating propeller propulsion system. This kindof motor can offset roll torque from each other in the circumferential direction whenthe propellers are producing thrust, which can avoid the side roll of the navigationdevice and keep moving forward. This function can also be applied to High speedwind power generators and Electric RC Helicopters. At present, although someexperts and scholars have studied a lot on it, but only for basic theoretical research.Mainly because of that this kind of motor has certain congenital defects. Itselectromagnetic relation is complex, makes it difficult to analyze and control thepower allocation. This article is based on this basis, to elaborate the basic theory andclearly point out the existence of defects and the reasons. And put forward somefeasible methods and suggestions to weaken and avoid these defects.This paper elaborates the basic theory of the double rotor reverse turn onpermanent magnet synchronous motor, including the structure, operation principle,electromagnetic model and vector correlation. The theoretical research in this area isrelatively mature, but there is controversy and deficiency of studies in these twoaspects-the first is the winding method of stators. There are many ways to form therotating magnetic field around both sides of the stator, We choose the method of twosets of windings in series here, because of its efficiency and necessity of research，thesimulation proved its rationality. The second aspect is stator magnetic circuitmodeling. As the rotating magnetic fields around the stator yoke of two sides sharethe same pathway, it makes the flux distribution of the yoke time-variable, and themagnetic reluctance changeable. The Magnetic yoke model presented by this paper isbrief and clear, and its finite element simulation proved its rationality.We also test the basic theory based on finite element simulation. One of thecharacteristics of this paper is validation of some theoretical ideas. Modeling is astrict theoretical-supported and practical-verified process, and this paper established the motor model by Ansoft Maxwell. And then test the basic theory one by one andanalyze the errors. The simulation proved it’s the availability in general engineeringapplication.At last, the paper looked into the defects and improvement method of the doublerotor-reverse turning-permanent magnet-synchronous motor. The reluctanceincreases when magnetic circuit has been paralleled. If the yoke is too narrow, themagnetic circuit will be saturated, resulting in asymmetry of the three-phaseelectromagnetic volume. When the stators on one side or both sides are shocked bythe torque, the torque and rotational speed oscillation will appear superimposedphenomenon and the concussion of the counter-rotating motor’s torque and speed willbecome more complex. The counter-rotating motor can be considered as the seriesconnection of two independent motor, and etc.