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Series wound motor, what controls the top RPM?

Discussion in 'Sensors and Actuators' started by supak111, Nov 10, 2013.

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  1. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

    Apr 29, 2012
    What controls the max RPM of a series wound electric motor?

    My understanding is if the motor has no load, RPM will just keep accelerating until the motor flies apart, is this correct?
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    Torque will decrease with increasing RPM, but it will never reach zero.

    If there were no friction, the motor would keep increasing speed (but at a decreasing rate) forever.

    But there is friction. (and other losses)
  3. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

    Apr 29, 2012
    Thank you Steve, just what I though.
  4. duke37


    Jan 9, 2011
    I have often wondered about this question.
    Most of the series wound motors are run on AC so there is a current limit due to the inductance of the windings. I have thought about trying an electric drill running on rectified AC and see if the speed goes up.
  5. supak111

    supak111 ★ƃuᴉɯǝɥɔs sʎɐʍlɐ★

    Apr 29, 2012
    Yea I wouldn't mind spinning one to destruction, but hook it up to sometime to see the rpms it achieves

    PS never though to look before but there are many videos on this on youtube actually, i guess i'm not the only one to find it interesting lol
    Last edited: Nov 11, 2013
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