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DC hub motor torque calculations, understanding specs

  1. Feb 3, 2013 #1
    Hello

    I'm confused by the specifications given for a Heinzmann DC brushed hub motor. It is giving me different values of torque/emf constants, armature resistances and inductances dependent on wheel size. I would think the torque constant does not depend on wheel size, but that this figure is inherent only to the motor. Why am I wrong? and how would I figure out how much current the motor is drawing for a certain torque and wheel size?

    Here is the data sheet:
    http://www.ebike.heinzmann.com/images/ebikesystems/phocadownload/Fahrradmotor-CLASSIC_DataSheet.pdf
     
  2. jcsd
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