Electrical Engineering › Section Z · AC motors › Topic Z.3
Stepper motors and brushless DC motors
Stepper motors and brushless DC motors both run from a dc supply, yet both are really ac machines: electronics switch their windings in sequence to make a moving field. Steppers turn that into precise steps, brushless motors into smooth, efficient rotation.
In this topic
- A motor that counts
- Step angle and the three types
- The variable reluctance stepper
- Worked example: a four-phase VR stepper
- Driving a PM stepper
- Hybrid steppers and winding connections
- Torque, speed and lost steps
- Worked example: a 3D-printer axis
- The brushless DC motor
- Worked example: commutation in a drone motor
- Common mistakes to avoid
- Key takeaways
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