Motor Control For Designers (Part 2): Electromagnetic Force Production In Motors
by Dennis Feucht, Innovatia Laboratories, Cayo, Belize, How2Power Today, Aug 15 2025
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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