Static Torque Analysis of Micro Claw-Pole Stepper Motor Based on Field-Circuit Combination

Area of Science:

• Electrical Engineering
• Electromagnetics
• Mechanical Engineering

Background:

• Micro claw-pole stepper motors present complex magnetic circuits, making accurate and rapid analysis challenging.
• Traditional 3D finite element analysis (FEA) is accurate but time-consuming; equivalent magnetic circuit (EMC) methods are fast but less precise.

Purpose of the Study:

• To develop a hybrid analysis method combining EMC and 3D FEA for micro permanent magnet claw-pole stepper motors.
• To accurately predict static torque characteristics and optimize motor performance while reducing design time.

Main Methods:

• Theoretical analysis using the equivalent magnetic circuit method to derive air-gap flux and electromagnetic torque equations.
• Integration of 3D FEA simulation results into EMC formulas for enhanced torque calculation accuracy.
• Experimental validation comparing theoretical, simulation, and measured torque values.

Main Results:

• The hybrid method achieved a motor torque error rate within 8.5% compared to experimental data.
• Optimized micromotor design resulted in a 12.5% increase in holding torque with minimal change in braking torque.
• Significant reduction in simulation calculation time and analysis complexity.

Conclusions:

• The combined EMC and 3D FEA method offers a suitable approach for preliminary design and optimization of micro claw-pole stepper motors.
• This hybrid technique balances accuracy and efficiency, making it valuable for micromotor development.
• The study demonstrates a practical pathway to enhance motor performance and shorten design cycles.