Motor Control For Designers (Part 4): PMS Motor Electrical Model
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Nov 14 2025
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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