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How long a motor can run

Discussion in 'General Electronics Discussion' started by electronicsLearner77, Nov 16, 2020.

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  1. electronicsLearner77

    electronicsLearner77

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    Jul 2, 2015
    If i take a synchronous motor and operate under the normal operating conditions and within its limits, Can i run the motor continuously like 24*7 or it is always required that it be stopped in between the operation to allow it to cool? If i keep operating the motor and provide the necessary cooling does its temperature increases to a certain point and stop?
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    A general answer cannot be given.
    Here's the key:
    If the motor can not run continuously, there should be a note in the manual or technical data. As for example you'll find in many small electric kitchen tools that they shall be operated for 5 minutes max. continuously, then need to cool down.
    Large industrial motors are often designed for continuous operation as you can't shut down a factory regularly in short intervals to let the motors cool.
    With increasing motor temperature the energy removed by thermal conductance and radiation increases. At some point the added energy from the motor's operation and the removed energy from thermal conductance and radiation will reach an equilibrium. At this point the temperature of the motor will no longer rise. As long as this point lies within the specifications of the motor all is good.
    This happens with every system that dissipated energy, not only motors.
     
    ratstar and electronicsLearner77 like this.
  3. Bluejets

    Bluejets

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    Oct 5, 2014
    As pointed out, synchronous motor covers a wide range.
    Can you be more specific?
     
  4. Minder

    Minder

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    Apr 24, 2015
    As others have mentioned, depends on the application, e.g. the older clocks were synchronous and ran 24/7!
    M.
     
  5. electronicsLearner77

    electronicsLearner77

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    Jul 2, 2015
  6. Bluejets

    Bluejets

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    Oct 5, 2014
    ....and once again for the fourth time...which motor?
     
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  7. Harald Kapp

    Harald Kapp Moderator Moderator

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    First supply the ones that have been requested.
     
  8. electronicsLearner77

    electronicsLearner77

    162
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    Jul 2, 2015
    Ok this is the one i planned to use.
     

    Attached Files:

  9. Harald Kapp

    Harald Kapp Moderator Moderator

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    There is no limit in the datasheet other than max. operating environmental temperature given by
    So the motor should be good for continuous operation. Unless another forum member can read more info from this datasheet, follow the instructions at the end of the datasheet:
     
  10. electronicsLearner77

    electronicsLearner77

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    Jul 2, 2015
    I have seen this motor getting heated up very fast in some seconds, need to confirm again. But how do i know if the motor is running properly in continuous operation? The temperatures it is reaching is normal? What are the things i need to be careful, so that i don't damage the motor.
     
  11. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    How much the motor heats up will depend not only on the power and cooling provided but also on the load attached.
    How should we be able to answer this question if you supply nothing but "heated up very fast"? What is the actual temperature you measured and where on the motor did you measure?
    Operate the motor within the specifications of the datasheet (voltage, load, ambient temperature etc.)
    What voltage (RMS) do you operate the motor from? From what is marked in the datasheet ~ 20 V (RMS) are to be expected.
    What is the actual current drawn by the motor in operation (when it gets hot)? Is it within specs? From what is marked in the datasheet max. ~3.5 A are to be expected. Absolute max would be ~7.5 A at max. load.

    BY the way: The motor in the datasheet is not a simple synchronous motor but a brushless DC motor. I assume you are using the matching controller for this motor?
     
  12. electronicsLearner77

    electronicsLearner77

    162
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    Jul 2, 2015
    It was running open load.
    No i did not measure with any tool, i don't have any, if i touch the motor with hand i found it very hot and not sure if it is the correct method of doing it.
    I need to buy a current probe to measure i have only a oscilloscope and i am operating with 24V adapter provided with the kit.
    Yes i am using a machine controller for this and running the FOC algorithm but not 100% sure if the algorithm is running perfectly.
     
  13. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    You don't have to. See this thread.
    You need to verify that.
     
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