New sinusoidal AC servo drive development - Page 30


View Poll Results: Preferred power stage type (see descriptions below)

Voters
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  • SMD discrete MOSFETs

    22 14.19%
  • IRAMS10UP60A power module

    26 16.77%
  • Discrete through-hole MOSFETs with heatsink

    78 50.32%
  • SMD discrete MOSFETS + possibility to connect own custom external power stage

    13 8.39%
  • Controller logic only without integrated power stage. An external power stage must be used.

    13 8.39%
  • Some other solution (please specify)

    3 1.94%
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Thread: New sinusoidal AC servo drive development

  1. #581
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    Default position or velocity mode?

    Hi,

    I saw this video (http://video.google.com/videoplay?do...92974890836012) for VSD-A fluxeon drive and I have one question for xerxes, granitedevices or anyone.

    I found comment for this video:

    AC servo turning thru a mixed mode sequence: 1) Running various speeds in velocity mode 2) Homing in position mode and positioning to 180, 90 and -360 3) Running various speeds in velocity mode 4) Homing in position mode and positioning to 180 90 and -720.

    My question: Is it some mistake in 3)? I think it has to be 3) Running various speeds in position mode.

    I say this, because running motor at low speed with encoder resolutions < 60000 is imposible in velocity mode, only in position mode with trajectory profile update every 5-10 ms. Or I am wrong?



  2. #582
    Registered Xerxes's Avatar
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    Default

    Quote Originally Posted by brodolomac View Post
    Hi,

    I saw this video (http://video.google.com/videoplay?do...92974890836012) for VSD-A fluxeon drive and I have one question for xerxes, granitedevices or anyone.

    I found comment for this video:

    AC servo turning thru a mixed mode sequence: 1) Running various speeds in velocity mode 2) Homing in position mode and positioning to 180, 90 and -360 3) Running various speeds in velocity mode 4) Homing in position mode and positioning to 180 90 and -720.

    My question: Is it some mistake in 3)? I think it has to be 3) Running various speeds in position mode.

    I say this, because running motor at low speed with encoder resolutions < 60000 is imposible in velocity mode, only in position mode with trajectory profile update every 5-10 ms. Or I am wrong?
    There is no mistake, it's velocity control. It's not impossible, but it needs careful controller design. VSD velocity controller accepts that velocity reading is noisy (which it is at low speeds), and that's why motor makes some dithering noise at low speeds.



  3. #583
    Registered manolomaravilla's Avatar
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    Default Re: New sinusoidal AC servo drive development

    mosfet special for 3000w brushless is
    model: ke724502



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New sinusoidal AC servo drive development

New sinusoidal AC servo drive development