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Thread: Is this a bad idea. Extended nut housing

  1. #25
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    Default Re: Is this a bad idea. Extended nut housing

    Quote Originally Posted by A_Camera View Post
    Yes of course but that was NOT what he said and was NOT what I commented about.
    I don't know any other way to read what he said as basically what I said. He said temperature rise, not rated temperature. I don't know if his values were a little high, but I've never seen a stepper with a rated temperature anywhere near as low as 60C.
    For an example, I just picked a random stepper from the first manufacturer I could think of.
    https://catalog.orientalmotor.com/it...rs/pkp264d14a2
    About 2/3 of the way down the spec sheet:

    Temperature Rise
    Winding temperature rise 176°F (80°C) max.
    Ambient Temperature Range
    14 ~ 122°F (-10 ~ 50°C) (non-freezing)

    There's actually no mention of absolute max or max working temperature (which surprises me, I'd expect some figures to allow for derating at high ambient temps.)



  2. #26
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    Default Re: Is this a bad idea. Extended nut housing

    Quote Originally Posted by skrubol View Post
    I don't know any other way to read what he said as basically what I said. He said temperature rise, not rated temperature. I don't know if his values were a little high, but I've never seen a stepper with a rated temperature anywhere near as low as 60C.
    For an example, I just picked a random stepper from the first manufacturer I could think of.
    https://catalog.orientalmotor.com/it...rs/pkp264d14a2
    About 2/3 of the way down the spec sheet:

    Temperature Rise
    Winding temperature rise 176°F (80°C) max.
    Ambient Temperature Range
    14 ~ 122°F (-10 ~ 50°C) (non-freezing)

    There's actually no mention of absolute max or max working temperature (which surprises me, I'd expect some figures to allow for derating at high ambient temps.)
    Each manufacture has his own set of specs to work with and they aren't always easy to translate from manufacture to manufacture. Linn for example has a max case temperature of 80 degree C and an operating ambient that covers a wide range. They also sell a "High Temperature" motor of which I could not find any specs. Compumotor specifies a case temperature between 0 - 100 degrees C with an ambient temperature in the same range. That Compumotor spec actually doesn't make sense to me because you wouldn't get much power out of a stepper at 100 degrees ambient before the motor is out of spec. Other manufactures just specify a a temperature rise which requires a bit of math to get to a max case temperature. For example your Oriental Motor specs implies a max case temperature of 130 degrees C which isn't unrealistic.

    Frankly I have seen the temperature rise spec far more than the case temperature specs. In some ways a temperature rise is more useful compared say to the Compumotor spec which to me isn't a very useful way to spec a motor. I've worked a bit with both Oriental and Compumotor steppers and can confirm that they will run hotter than hell for years on end.

    In any event this is why I always ask people to actually measure a steppers temperature when they complain that the steppers are too hot. Even a case temp of 50 degrees C can be painful to come into contact with and even a cheap knock off Chinese stepper can easily operate at that temperature. That doesn't mean you won't damage a stepper from running too hot, that can be easily done, what it means is that if you haven't measured the temperature you really don't have any idea just how hot the motor is.



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Is this a bad idea. Extended nut housing

Is this a bad idea. Extended nut housing