Influence of Asymmetric-paths Winding Form on Electromagnetic Exciting Force of Variable Speed Pump Storage Motor
The stator asymmetric-paths winding of variable speed pump storage(VSPS)motor can solve the problem of the mismatch of the unit speed,capacity and outlet voltage,but different winding connection schemes will lead to the change of MMF asymmetry of each branch,and affect the electromagnetic exciting force of the motor.In order to explore the effect of this winding form on the electromagnetic exciting force,firstly,the analytical solution of stator asymmetric-paths winding MMF and electromagnetic exciting force VSPS motor is derived.The effect of different asymmetric-paths winding on the MMF and electromagnetic exciting force of 336 MW VSPS motor are obtained by considering the asymme-try,MMF amplitude,phase deviation and short-pitch factor.The finite element model of the VSPS motor is further de-veloped and the electromagnetic exciting force of the VSPS motor is calculated.Then the influence of circulating current on the electromagnetic exciting force is discussed.The results show that the reasonable asymmetric-paths winding can ef-fectively weaken the electromagnetic exciting force.The scheme of unequal spaced asymmetric-paths winding with pitch of 14-15-16 can minimize the impact of circulating current.The results of the study can provide technical support for the development of localized VSPS motors.
VSPS motorasymmetric-paths windingMMFelectromagnetic exciting forcecirculating currentan-alytical solutionfinite element analysis
万方数据
维普
