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Thread: stepper motor noise & heat

  1. #1
    Join Date
    Nov 2009
    Location
    Whanganui New Zealand
    Posts
    312

    Default stepper motor noise & heat

    I have a scanner that has an issue. The stepper motors that drive the mirror make a high pitched noise.
    They also get quite warm.
    Any ideas?

  2. #2
    Join Date
    Apr 2012
    Location
    Beaverton, OR
    Posts
    245

    Default

    Thats the PWM frequency of the stepper drive. And many motors get very hot when running. Burn yourself hot.

    If that is not normal for your machine you might have a bad drive.

  3. #3
    Join Date
    Dec 2010
    Location
    DC/VA metro area, USA
    Posts
    554

    Default

    Stepper motors were not designed to be galvos. When placed in to service as such, they have significant limitations, including frequency response and open-loop control. To reduce noise and heat, drive them with lower-frequency signals at a lower amplitude. If you're unhappy with their performance or they fail, look in to some of the commonly available chinese scanners... at well under $100, they will still perform orders of magnitude better than "stepper motor galvos."

  4. #4
    Join Date
    Jan 2015
    Posts
    1

    Default

    Nice find.
    Very interesting that the light source dose not encroach on the desired effect to the point that you can't tell where it's coming from.

  5. #5
    Join Date
    Nov 2007
    Location
    Sydney, Australia
    Posts
    600

    Default

    From what I have seen of some of these types of projectors is that they will energize one coil of the stepper full time to hold the rotor mid step and use the other coil for the drive, therefor with one coil being energize all the time they will get hot

    The high pitched noise is the drive coil, if it is making more noise then the other motor, then the rotor could be seizing

    You really didn't define the issue apart from noise and heat
    RTI Piko RGB 4 Projector
    CT6215 Scanners & CT 671 Amps; CT6210 & Medialas Microamps. GS124PD
    RGBLaser Systems 6000mW RGB Module - 638nm/445nm/532
    LD2000 Pro + QM2000.net + Beyond
    Etherdream + LSX

    Old Projector Build


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