| Mechanical flux-adjusting permanent magnet synchronous motor is a kind of variable flux permanent magnet synchronous motor,and it is a novel type of motor that uses an additional mechanical device to change the fixed magnetic field generated by the permanent magnet.In this paper,a kind of Rotary PMs Mechanical Flux-Varying PM Synchronous Machine(RPMFVPSM)is studied.Firstly,the electromagnetic characteristics of a topology that is suitable for the device of flux-adjusting are optimized —— Interior permanent magnet synchronous machine(IPMSM)with double-layer PMs.Then,another different topology scheme —— single-layer permanent magnet IPMSM was proposed,and the electromagnetic characteristics of the two topologies were compared.Finally,a better topology was obtained.Based on understanding the working principle and structure size of this type of RPMFVPSM,the electromagnetic characteristics,mechanical dynamics and temperature field characteristics of the topology structure are joint simulated by the finite element analysis software.The research results in this paper provide a kind of idea for the difficulty of flexible adjustment of the air gap magnetic field of the traditional permanent magnet synchronous motor,and have important research significance and engineering application value for the expansion of variable flux permanent magnet motor in the industrial field.The specific research work and main results of this paper are as follows:1.Electromagnetic performance optimization of double-layer permanent magnet interior permanent magnet synchronous motor.A double-layer permanent magnet structure suitable for the flux-adjusting of the mechanical magnetic adjustment device is proposed,and the electromagnetic performance of the topology is optimized from the aspects of permanent magnet thickness,magnetic bridge width,stator slot width and skewed stator slot,thereby determining the structural parameters of the motor.2.Comparison of electromagnetic characteristics of different schemes and analysis of electromagnetic properties of single-layer permanent magnet IPMSM.Different schemes suitable for the flux-adjusting of the mechanical magnetic adjustment device are proposed,and the electromagnetic characteristics are compared and analyzed from different pole slot matching and different number of permanent magnet layers,so as to determine a better topology that is suitable for the flux-adjusting of the magnetic adjustment device ——8-pole 48-slot single-layer permanent magnet interior permanent magnet synchronous motor,and study the electromagnetic characteristics of the structure running at three speeds,thereby laying the structural foundation for the prototype making of the structure.3.Dynamic simulation of additional magnetic adjustment device and study of weak magnetic capability of motor body.Based on the virtual prototype simulation software ADAMS,the relationship between the spring deformation length and the gear rotation angle of the magnetic adjustment device is analyzed.The variation of the rotation angle and the rotation speed of the permanent magnet is obtained.The electromagnetic characteristics of the machine under the three conditions of rotation angle,that is 0 deg.?30 deg.and 60 deg.respectively are calculated.The finite element simulation results confirm the properties of flux-weakening of this type of the new mechanical flux-adjusting motor,and the rationality of the new additional mechanical flux-adjusting device realizing the variable magnetic flux is proved.4.Simulation of electromagnetic field and temperature field coupling.The mechanical design software Solidworks is used to build the three-dimensional finite element model of the motor.The electromagnetic field finite element software ANSYS Maxwell is used to calculate the copper loss of the armature winding,the core loss of the silicon steel sheet and the eddy current loss of the permanent magnet under the three speeds of the motor under no-load and load conditions.the finite element simulation of the three-dimensional model of magneticthermal coupling simulation is calculated by the multi-physics simulation software ANSYS Workbench,and the distribution law of the internal temperature field of the motor is further analyzed. |
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