The Application of Ansoft EM in Motor Design

The Application of AnsoftEM in Motor Design Li Shuai, Peng Guoping, Yu Zhenmin, Yi Pinghu (Xi'an Jiaotong University, Xi'an, China. Maxwell2D module is used for magnetic field research and motion simulation, and the precise design of the motor is realized by field-circuit method. , achieved a more ideal design effect.

1AnsoftEM Package Introduction Device Analysis Design and Electromechanical System and Electronic System Simulation This article focuses on the RMxprt module and Maxwell 2D module used in motor design.

The module RMxprt is a rotary motor design software for single-phase and three-phase induction motors, DC permanent magnet brushless motor permanent magnet synchronous motors, permanent magnet speed governing synchronous motors DC permanent magnet motors switched reluctance motors and three-phase synchronous generators. The design of eleven types of motors, such as magnetic synchronous generators and AC-DC motors, full-voltage starting permanent-magnet synchronous motors, can quickly explore the design space, find the best motor design and initial size, and use classical analytical methods before precise design. With the equivalent circuit, the approximate simulation results are quickly obtained and the design scheme is effectively evaluated.

Maxwell 2D has the analytical and computational functions of the electrostatic field, linear and nonlinear magnetic field conduction current fields and eddy current fields, and can easily calculate electromagnetic components without or negligible three-dimensional effects.

Maxwell2D's Transient function uses an advanced motion surface algorithm to quickly and accurately simulate two-dimensional time-varying electromagnetic fields, regardless of whether the analysis or calculation object is moved to any position or angle, allowing the user to input to the field source. The real-time control of the mechanical component time step and analog stop time can be used for the transient analysis of electromagnetic components such as motors. It can provide complete field solutions and electromechanical data such as flux distribution, local saturation, back-EMF change dynamics and Torque response, speed response, position map, etc.

2 An Ansoft EM design analysis of a permanent magnet DC motor This paper designs a permanent magnet DC motor using the two modules mentioned above, and performs a finite element analysis on it, and has achieved good results. The rated data of the DC motor For: rated power 38W, rated voltage 24V, rated speed 3500r/min, requires less torque ripple. In this paper, xprt is used to select the initial solution and Maxwell 2D is used for electromagnetic field analysis and motor motion simulation for more accurate design.

21 Selection of initial design plan Firstly, the design plan is preliminarily selected according to the parameters of motors of the same type. The stator, rotor and iron core geometry, winding structure, material properties and mechanical load data are entered in the RMxprt integrated user interface. The program is run. After that, the curve and parameters of the motor in the steady state, no load, stall, fault rated current torque and efficiency are obtained. According to these parameters and curves, the design scheme is evaluated and then returned to the user interface to adjust the design. This is repeated. Finally, a satisfactory result is obtained. The performance curve of the last scheme generated by RMxprt is given (~ 4). And the main dimension data (Table 1) The permanent magnet material used in the permanent magnet motor is bonded NdFeB, the remanent magnetization density is 0.65T, the coercive force is 440KA/m; the permanent magnetic pole is the tile type radial charge. Magnetic, number of poles 2 Table 1 Motor main dimensions data (mm) Armature diameter Armature length Air gap length Permanent magnet thickness K Magnet length Stator outer diameter 38 22 0.5 4 22 53 Speed-efficiency curve 2D interface function Maxwell is generated 2D calculation model for the next simulation and accurate design.

2.2 Using Maxwell 2D Accurately Designing Traditional Motor Designs Using Equivalent Magnetic Circuits Many of the coefficients in the calculation require the use of electromagnetic field calculations and magnetic field analysis provided by 2D to calculate other motor parameters such as the no-load leakage coefficient, calculation of the pole-pole coefficient. And so on, it provides the conditions for the combination of field and motor design.

3 Conclusions The application of AnsoftEM in motor design can make cumbersome and abstract design analysis process simple and intuitive. Calculating a solution with RMxprt takes only a few minutes, which makes it possible to quickly select a best Fangan from tens or even hundreds of solutions. Maxwell2D's electromagnetic field analysis, transient simulation capabilities, and post-processing capabilities make precise motor design possible. It can be seen that using AnsotfEM in motor design will inevitably greatly simplify the motor design process, shorten the development cycle of the motor, reduce the development cost, and improve the air-gap flux density waveform after design.


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