Motor Control For Designers (Part 2): Electromagnetic Force Production In Motors

Focus:

This part continues the discussion of motor theory by explaining how electromagnetic force is generated. It introduces the Lorentz Force equation to explain the generation of mechanical force in electrostatic and magnetic motors. Next, it uses the example of a simple two-pole motor to explain how the motor components cause magnetic fields to interact to produce force and motion. The relationship between rotor field and stator field-current vectors is used to explain phase and magnitude control as the basis for motion control including torque generation. The next section, describes an outer-rotor permanent-magnet (PM) motor including pole-pairs, winding configurations, and various aspects of its operation. Finally, the roles of pole-pairs and phase windings in the implementation of phase control and the regulation of torque angle for field-oriented control are explained.

What you’ll learn:

• How to understand the theory behind electromagnetic force generation in electrostatic and magnetic motors
• How to understand the theory underlying phase and magnitude control, torque generation, and field-oriented control in electric motors

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Author & Publication:

Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Aug 15 2025

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