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  1. kubark42

    Converting 3-phase to 6-phase by cutting coils at the star point

    I have a 3-phase motor where the individual coil leads are very easily accessed at the star point and phase leads. It is a 42 pole, 36 tooth, 20kW, 380A motor which has test data showing 94% efficiency at 20kW. I am wondering whether it would be practical to cut the leads where the coils join...
  2. kubark42

    Battery pack selection for self-launching glider

    I'm converting an AC-5M to electric, and I've been struggling for a while now to figure out how I want to do my battery pack. I keep coming back to LiPo as the right solution. When I look at the existing eGlider solutions, I've come to realize that they have unnecessarily large packs because...
  3. kubark42

    Looking for featherweight geared hubmotors, >10kW

    I'm looking for the lightest of lightweight geared hubmotor options in the 10-15kW range. My particular application is one where I need high torque (~100Nm) at low RPM (~1300) in a COTS package, and hubmotors really fit the bill. However, the motors I've found so far seem to be trending around...
  4. kubark42

    Extracting maximum power from a BLDC

    In theory, and somewhat in practice, a motor's power limit is determined only by its ability to (1) keep cool and (2) not fly apart under centrifugal loads. I want to know how to apply theory in order to determine on a case-by-case basis how to push a motor past its published specs. Assuming I...
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