Motor Design Engineering Considerations - II — Lesson 2

This lesson covers the practical engineering considerations in motor design, focusing on cogging torque, torque ripple, heat evacuation, and resistance minimization. Cogging torque, a jerky movement in motors, is caused by the varying reluctance profile around the rotor. The lesson explains how increasing the number of bumps can minimize this effect. The lesson also discusses torque ripple, which leads to a jerky and vibrating ride experience. It explains how skewing can reduce both cogging torque and torque ripple. The lesson further delves into heat evacuation, emphasizing the need to replace air with better heat conductors to prevent overheating. Lastly, the lesson highlights the importance of minimizing resistance in the entire system, not just the motor windings, to improve motor efficiency.

Video Highlights

00:17 - Explanation of cogging torque and torque ripple in motors
08:52 - Importance of heat evacuation in motor design
13:33 - Discussion on the wavy washers
22:30 - Importance of minimizing contact resistance in motor design

Key Takeaways

- Cogging torque and torque ripple can be minimized by increasing the number of bumps and skewing.
- Heat evacuation is crucial in motor design to prevent overheating. This can be achieved by replacing air with better heat conductors.
- Resistance minimization should be considered in the entire system, not just the motor windings, to improve motor efficiency.
- Practical engineering considerations are vital in motor design to ensure smooth operation and longevity.