Motor Control For Designers (Part 4): PMS Motor Electrical Model

Focus:

This article introduces a basic PMS motor model that represents the electrical and mechanical reference frames of the motor. It uses a torque-current analogy to convert mechanical parameters to their electrical equivalents. Key terms are defined and the justifications for the choice of this model are explained. Then the article explains the torque-speed equation as well as related expressions for stall torque and no-load speed, and how the motor parameters used in these equations are selected when creating a motor design. The concept of Mechanical Ohm’s Law is also introduced, which allows the PMS motor model to be converted to an all-electrical model that can be used in a circuit simulator to analyze an entire electromechanical system.

What you’ll learn:

• How to model a PMS motor under magnitude control using the torque current analogy
• How to create an all-electrical model of PMS motor which can be applied in a circuit simulator

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Nov 14 2025

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