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Question : About DC-motor

Discussion in 'General Electronics' started by bamse, Jan 21, 2004.

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  1. bamse

    bamse Guest

    I have a chart that shows the correlation between torque and rotational
    speed for a DC-motor:

    The chart can be viewed here:

    The motor is inside an actuator, which is used to control the pitchangle of
    a rotor blad on a wind turbine.

    For those who do not know what "pitchangle" is, I can inform that pitching
    of a wing just means rotation of
    a wing around its length-axis.

    My question is:

    What is the chart used for? What can you deduce from this chart? And what
    relevant information can be deduced when the motors purpose is taken into
  2. Wade Hassler

    Wade Hassler Guest

    The values at bottom right are used to design a servo-function that
    would use this motor to control some aspect (voltage? power output?
    frequency?) of the equipment whose blades are being rotated. The rest
    is probably useful, too.
  3. HeySteve

    HeySteve Guest

    This chart shows all the operating parameters of the motor. The driven
    load also has a characteristic torque-speed curve. When you have the
    load's torque speed curve, you superimpose that on the motor's chart
    and where the two intersect gives the operating point of the motor.
    You can then read off how much power will be needed to drive the

    Different loads have different types of torque speed curve. For
    example for the turbine itself, for each pitch angle there is a torque
    speed curve, usually parabolic, that is, the torque is equal to the
    square of the speed. For the actuator I would imagine it is just a
    straight line with a constant torque value whatever the speed.
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