| With the approaching of world energy crisis and increasingly deficient traditional fossil energy,it is necessary to develop and apply new energy.The energy storage technology plays a key role in energy application.As a novel energy storage device,flywheel battery makes up for the shortcomings of traditional chemical battery,such as low efficiency,short life and serious pollution,which has the advantages of high energy conversion efficiency,small size,low loss,long life and no pollution.Therefore,the flywheel battery energy storage equipment will replace the traditional energy storage equipment in the near future.Hybrid excitation double stator bearingless switched reluctance motor(BSRM)is quite suitable to be used as the drive motor of flywheel battery due to its high speed,wide speed range and low loss of good performance.The vibration noise study of hybrid excitation double stator BSRM not only improve the quality and life of the motor,but also reduce flywheel battery loss and improve the efficiency of energy storage,which is of great significance in the design of flywheel battery drive motor.In this paper,the motor is designed according to the characteristics of hybrid excitation double stator BSRM applied for flywheel battery.Based on the analysis of structure characteristics,operating mechanism and electromagnetic characteristics of motor,the vibration and noise characteristics are analyzed from the aspects of electromagnetic force and motor mode.And the rotor tooth of motor is optimized to reduce vibration noise.According to the comparison of the motor vibration noise characteristics before and after optimization,the optimization strategy can reduce electromagnetic vibration noise effectively.The specific content is as follows:1.The motor topology and operation mechanism is elaborated.Based on the performance requirements of the flywheel battery drive motor,the motor structure parameters is calculated.And the electromagnetic characteristics are analyzed and verified by using Ansoft Finite element simulation software.2.The vibration of hybrid excitation double stator BSRM is mainly from the radial electromagnetic force of air-gap.Therefore,the radial electromagnetic force of inner and outer stator is calculated and simulated,which determine the main excitation source of electromagnetic vibration of the motor.And the spectral characteristics and spatial order of outer stator is analyzed.Then the motor 3-D model is established for the mode analysis.The main vibration type and corresponding natural frequency is analyzed when the motor is on vibration.3.Simulation 3-D model is established based on the vibration noise of hybrid excitation double stator BSRM.Firstly,the vibration harmonic response is used to analyze the generating motor vibration response when the radial electromagnetic force of outer stator acts on the inner surface of outer stator tooth.Then the simulation model of acoustic field is established for the acoustic response analysis.Finally,the vibration and noise of actual operation of motor in rotor eccentricity are analyzed.The vibration and noise characteristics of the motor in rotor eccentricity are explored by analyzing the amplitude,spatial order and frequency characteristics of the radial electromagnetic force of the outer stator.4.In this paper,reducing the radial electromagnetic force amplitude of the motor to reduce the electromagnetic noise as the optimization objective.The rotor tooth shape is optimized by grooving of the rotor teeth to reduce the radial force amplitude.Then the influence of slot parameters on the radial electromagnetic force is analyzed,and the slot parameters is optimized by using the genetic algorithm to determine the optimal slot size.By comparing the radial force and vibration noise characteristics before and after the rotor tooth shape optimization,which verifies the effectiveness of the scheme optimizing rotor tooth shape to reduce the electromagnetic vibration. |
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