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Electric motor gearing question

Discussion in 'Electric Vehicles' started by theboom1, Sep 15, 2017.

  1. theboom1

    theboom1 Member

    Joined:
    Apr 24, 2016
    Messages:
    198
    Location:
    Alabama
    I am pretty sure I know the answer to this but I just want to hear someone else confirm my beliefs. If you have 2 electric motors, both with a very similar power curve and the following specs are:

    Motor one: 400hp and geared at 2:1 and rpm redline at 10000
    Motor two: 200hp and geared at 4:1 and rpm redline at 20000

    All things being equal, will they accelerate at the same rate?
     
  2. Tiger

    Tiger Member

    Joined:
    Oct 31, 2016
    Messages:
    495
    Location:
    Estonia
    Drag from air increases with velocity, and you need torque at high speed to overcome that.

    So it will depend on what car it is. Not sure if mass affects too because at lower speeds you need torque for acceleration.
     
  3. SSedan

    SSedan Member

    Joined:
    Jul 24, 2017
    Messages:
    95
    Location:
    Greenville Wisconsin
    HP is torque over time, think you meant to ask about torque. HP is a measure of work that can be done.

    Gearing helps ICE vehicles because it helps them get past the low torque low rpm range sooner.
     

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