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week5-winding-design.md

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Week 5- Winding Design

Topics Covered:

  • Winding design in air-cored PM motors
  • Winding factors (distribution-pitch factor)
  • Standard cable sizes
  • Electrical-Magnetic Loading

Assignment:

This week, you are required to design the winding for the PM motor we covered last week.

Notes:

  • If there are some points not clear from last week, please go and review these.

  • We will use a sinusoidal B distribution throughout the airgap. As everyone, found slightly different numbers, we will assume a sinusoidal magnetic flux density distribution with a peak value of 0.6 T.

  • Recalculate the flux linkage for a full-pitched coil.

  • Assume we have to leave 1 mm for the mechanical air-gap (i.e. the winding thickness will be 4 mm)

  • Decide on number of turns, number of coils such that you will obtain 24V induced voltage at 1500 rpm. Remember, you need to design 3-phase winding arrangement.

  • Decide on how many coils will be connected in series and in parallel.

  • When calculating the geometry, assume the fill factor is 0.7.

  • You are required to use standard AWG round cables.

  • By assuming a current density of 4 A/mm2, calculate the rated phase current and rated power.

  • Calculate the phase winding resistance, and copper losses at the rated current.

  • You are free to use Matlab, Excel etc, you are also free to make your calculations on paper and bring it with you.

  • Please review EE362, and EE564 notes if you have problems on winding arrangements.

Still Have Questions?

  • Please don't hesitate to ask for help. You are encouraged to work together, but I expect everyone to prepare their own assignments.

  • If you have a public question, please open an issue in this repo, and I will try to answer it asap.