Research on Static Magnetic Field and Torque Characteristics of Hybrid

Stepper Motor Based on ANSYS

Author: WangHuan

Tutor: LiXingGen

School: Zhejiang University

Keywords: ANSYS,Finite Element Method,Torque characteristics,Enhanced hybrid stepper motor

CLC: TM383.6

Type: Master's thesis

Year: 2012

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Due to the limitation of computing performance of the computer,2D FEM (Finite Element Method)

was always used for the electromagnetic field analysis of the hybrid stepper motor in the past, such

as tooth-layer specific permeability method. However, the electromagnetic field of hybrid stepper

motor is a typical highly saturated 3D nonlinear electromagnetic field. The magnetic field

distribution is very complicated; especially the axial magnetic distribution is not uniform because of

the influence of axial magnetizing permanent-magnetic materials installed on the rotor. With the

development of computer performance and the application of the universal finite element

software,3D finite element analysis of the whole motor magnetic field is practical and feasible.

Therefore,3D finite element model of the hybrid stepper motor was set up to analyze static magnetic

field and calculate the torque characteristics in this dissertation.Firstly,3D finite element model of

two-phase and five-phase hybrid stepper motor is established by the universal finite element

analysis software ANSYS, based on the basic of the electromagnetic field theory, to calculate the

static magnetic field distribution. Static characteristics, especially the torque-angle characteristics

which is very important to the performance of the motor, is further calculated.Then, the

torque-angle characteristic calculation program is written, based on the traditional tooth-layer

specific permeability method, to calculate the torque characteristics of the above two-phase and

five-phase hybrid stepper motor. Then, the calculation results are compared with ANSYS

calculation results and the experimental results. The study found that, the calculation precision of

ANSYS calculation method is obviously improved.An enhanced two-phase hybrid stepper motor

which has permanent-magnetic materials installed in the stator slots is introduced in this

dissertation.3D finite element model of the motor is established by ANSYS to calculate the

torque-angle characteristics, and then compared with the same type standard two-phase hybrid

stepper motor. The study found that, the static torque of Enhanced hybrid stepper motor is greatly

increased. And the torque production mechanisms are further analyzed. Optimization design of

enhanced hybrid stepper motor tooth layer structure, air gap and properties of the stator slot

permanent-magnetic materials are carried out, based on the target of maximum static torque output

and improve torque-angle characteristics curve waveform.

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