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The permanent magnet motor has the advantages of high power density, safe operation and simple maintenance, and so on. Based on the analysis of the three-dimensional magnetic field distribution characteristics of permanent magnet synchronous motor (PMSM), permanent magnet DC motor is used as an example, The dynamic finite element analysis model of permanent magnet DC motor is characterized by the new interpolation motion boundary method to solve the rotor motion. The commutation law of the winding is calculated according to the actual brush width and winding distribution. Through the finite element analysis model, the current-torque characteristics, taking into account the cogging effect and commutation caused by the torque ripple, in-depth study of permanent magnet DC motor performance is important. The analysis method used in this work can be used to analyze the whole winding permanent magnet motor, can also analyze the ordinary DC motor, the simulation results prove the accuracy of the algorithm, the electromagnetic field numerical calculation method for permanent magnet motor design and performance analysis is important Guiding significance. Introduction Permanent magnet DC motor has both good excitation and DC motor speed characteristics and mechanical characteristics, but also eliminates the need for field winding and has a simple structure, small size, with less copper, high efficiency. The total cost of using ferrite permanent magnets is generally lower than that of an electromagnetism motor. From the home appliances, portable electronic devices, power tools to require a good dynamic performance of the precision speed and position of the transmission system are widely used permanent magnet DC motor. Permanent magnet DC motor has a broad application of development space. In Ref.1, the principle, design and stabilization system of permanent magnet DC motor are introduced in detail. In this work, a series of studies on the performance analysis of permanent magnet DC motor are carried out by field-circuit method. The effective length of the armature, a series of data for magnetic circuit calculation, the accuracy of magnetic circuit analysis is improved. There are two key problems in the dynamic finite element model of permanent magnet motor. First, the rotor motion problem is simple and efficient, and the second is the accurate calculation of the winding current distribution law. The dynamic finite element model is actually a time-step finite element method. If the rotor motion problem is less efficient, it will bring a lot of computational load, or only a few rotors the performance of the motor can not be accurately calculated when calculating. In the process of rotor movement, the winding current changes due to commutation, so to calculate the rotation of the armature on the winding current changes over time, which is not involved in the static analysis model . Aiming at the above research situation, this work establishes a precise dynamic finite element analysis model of permanent magnet DC motor. A new type of interpolation motion boundary method is used to deal with the relative motion of the rotor. For the wide range of three-slot motors, the difference of the armature reaction between the forward and reverse rotation of the star-connected three-slot motor is pointed out and the reason is revealed by comparing the armature reaction law of the winding connection and the winding triangular connection. The causes of the torque ripple caused 2017 International Conference on Computing, Communications and Automation(I3CA 2017) Copyright © (2017) Francis Academic Press , UK 118 by the permanent magnet motor are analyzed, and the measures to reduce the torque ripple are discussed. A simple and efficient calculation method for cogging torque is given to the chute and the oblique pole, and the measures to establish the sine wave air gap magnetic field to weaken the torque ripple are discussed . Mathematical model of magnetic field of permanent magnet motor Permanent magnet permanent treatment method is the permanent magnet magnetization characteristics directly reflected in the differential equation. The permanent magnet works on the reply line and the return line is a straight line. For rare earth magnets, the return lines and demagnetization curves coincide. The relationship between B and H of the permanent magnet operating point is: 1 c H H B μ = − (1) Where 0 c μ μ μ = Using the vector magnetic bit A as the solution of the bit function, according to the Maxwell equation, the electromagnetic field boundary value of the permanent magnet motor can be expressed as: 1 ( ) 1 ( ) 0 c

Performance Analysis and Simulation of Permanent Magnet Motor Based on Numerical Calculation of Electromagnetic Field