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Is it Possible to get over 90% efficiency from a servo motor

  1. May 29, 2016 #1
    ....If so what would the highest figure be whilst running a 1kw (single or 3 phase) motor under normal conditions also would using a 10:1 Gearbox change that efficiency level?
    Last edited: May 29, 2016
  2. jcsd
  3. May 29, 2016 #2


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    Yes, it is possible: Use a 3 phase synchronous motor with sinusoidal commutation, and control cos φ carefully. Cos φ shall not be exactly 1.0, but close to. The value depends on the motor.

    You must use a digital voltage controller, that reads the angular position of the rotor by means of an encoder.

    Of course a gearbox will change the efficiency: No gearbox has an efficiency = 100%
    Last edited: May 29, 2016
  4. May 30, 2016 #3


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    The efficiency of most types of servo motors actually used for servo positioning and similar applications is often quite low .
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