Design And Analysis Of New Modular Stator Hybrid Excitation Synchronous Motor

The hybrid excitation motor is a combination of a permanent magnet motor and an electric excitation motor,and the air gap magnetic field can be flexibly adjusted through the electric excitation winding.At present,traditional silicon steel sheet core material is generally used,but this material limits the further reduction of stator iron loss.Therefore,a hybrid excitation synchronous motor with a novel modular stator structure based on amorphous alloy materials has been studied.The rotor adopts a staggered magnetic pole structure,so that the surface-mounted structure can also obtain a strong magnetic adjustment ability.As a new dualgreen material,amorphous alloy can effectively reduce iron consumption.And the magnetic flux of the hybrid excitation synchronous motor studied has typical three-dimensional characteristics.The stator yoke adopts wound amorphous alloy to provide both axial and circumferential magnetic flux paths.Compared with the hybrid excitation motor with a similar staggered magnetic pole structure,it saves space for the magnetic back yoke.The threedimensional finite element method analysis of the hybrid excitation motor is time-consuming,and the equivalent magnetic network method can greatly reduce the calculation time.The equivalent magnetic network of the motor is modeled and calculated.Firstly,a hybrid excitation synchronous motor with a novel modular stator staggered pole rotor structure based on amorphous alloys has been studied.The principle of electromechanical energy conversion of the new motor is analyzed,the principle of magnetic field regulation of electric excitation is explored and analyzed,and three-dimensional finite element simulation is used to verify the feasibility of magnetic regulation of the hybrid excitation motor.The mathematical model and phasor diagram of the motor are established,and the principle of magnetic regulation is further explained.Secondly,a new hybrid excitation synchronous motor with a new modular stator and staggered pole-rotor structure is designed.The structural and electromagnetic design of the motor is carried out by combining the characteristics of amorphous materials and magnetic flux paths.The electromagnetic characteristics of the two rotor structures and the influence of the modular stator structure on the electromagnetic design are compared and analyzed.The design method of electric field winding is studied.The influence of the air gap length on the magnetic density and the magnetic adjustment ability of each part of the motor is analyzed and calculated.The electromagnetism scheme of the motor is finally determined.Thirdly,the electromagnetic calculation and analysis of the motor are carried out by three-dimensional finite element.The magnetic field distribution of the hybrid excitation motor in different working states is analyzed,and the flux linkage waveform and back EMF waveform under no-load are calculated.The magnetization ability of the motor is analyzed and calculated.The calculation analyzes the ability of the electric field winding to increase the torque at low speed.The difference of leakage flux between the traditional radial motor and the new hybrid excitation motor studied is analyzed and calculated.The iron loss of the silicon steel sheet motor and the amorphous alloy motor under the motor structure is compared,and it is verified that the use of amorphous alloy will greatly reduce the iron loss.Finally,a three-dimensional equivalent magnetic network model is established for the electromagnetic operation mechanism of the new modular stator hybrid excitation motor.The analytical model can calculate the air-gap magnetic field distribution,flux linkage and back EMF under no-load conditions,which provides a fast analysis tool for the analysis of the electromagnetic characteristics of the motor with the new modular stator staggered pole rotor,it lays the foundation for the subsequent optimization analysis of the motor.