| ABSTRACT:Flywheel energy storage system is dependent on the motor turning the flywheel energy storage and flywheel driving motor power generation to achieve energy release. Therefore, the motor/generator is one of the core components of the flywheel energy storage system that electricity and mechanical energy conversion, there is (absolute impact on the entire system. It is necessary to carry out a systematic study of flywheel energy storage under different conditions withcontrol modeand the body structure of permanent magnet motoraffect the electromagnetic field and the temperature field.In this paper, with a12.5kW of permanent magnet motor forflywheel energy storage as the object of study.Research on the control method of permanent magnet motor with electric condition, this paper derived the square wave and sine wave control mathematical model of permanent magnet motor, it has established two kinds of control mode and finite element field-circuit coupling motor systems. By the calculation of field-circuit coupling system, it can obtainthe armature current, voltage, harmonic content under the two types of control motormode andanalyzethe motor internal flux density distribution.Sine wave control calculation results compared with the measured results, the accuracy of the calculation method is verified. Then this paper gives the stator iron losses and eddy current losses in the rotor surface variation with carrier and air gap length ratio underthe two types of control motor mode.Further study of the impact of the ends of the leakage inductance of the stator lossesand rotor losses.This part of the calculation of lossfor the study of motor temperature field as a foundation.Permanent magnet motor running in the working condition of power, the motor internal electromagnetic field will be affected by the rectifier circuit. The establishment of a rectifier circuit and field circuit coupled motor body model system to study the variation of internal electromagnetic motor, stator loss and rotor losswithgenerator constant speedand rectified DC voltage with rectifier filter capacitor, motor speed. In the rectifier circuit is analyzed under the influence of the motor phase current harmonic content, air gap magnetic flux density.Flywheel energy storage with permanent magnet motor is built three dimensional calculation model of the global temperature, the motor temperature at different operating conditions are calculated.Motor runs on electric working conditions, Square wave and sine wave control mode of motor in the motor carrier ratio and air gap length, the leakage inductance of the winding end influence on motor temperature field is studied,from the permanent magnet temperature distribution curve to get the permanent magnet temperature change rule. In addition, starting from the sheath structure, using the method of cutting eddy current pathto reduce eddy current losses in the sheathing. Motor cover is calculated using the original structure, paragraph structure and two kinds of mesh motor temperature, temperature changes of the motor components are analyzed, permanent magnets are given the highest surface temperature changes with sheath structure variation. For permanent magnet motors running in testing the temperature of electric, loss and its calculation method of temperature accuracy is verified. When motor running in generating conditions was studied at different speed motors each component variation of temperature.In the previous research, on the basis of studying the flywheel energy storage charge and discharge control mode,established the flywheel energy storage charge square wave and sine wave control field-circuit coupled systems, compared analysis of the flywheel energy storage process under different control mode motor armature current, electromagnetic torque and rotational speed changes. Studied the charging process inside the motor harmonic electromagnetic field and flux density variation of flywheel energy storage in two control modes.Establishing flywheel energy storage field-circuit coupling constant pressure discharge system, to achieve the system output dc voltage stability in310v.Study the flywheel energy storage motor internal electromagnetic field change process of discharge, the discharge process of motor air gap flux density is given. |
