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Thread: Motor encoder alignment

  1. #13
    Community Moderator Al_The_Man's Avatar
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    Default Re: Motor encoder alignment

    Quote Originally Posted by Azalin View Post
    By magnetic I mean the encoder has no rotating part, it just senses the rotation of a magnet.

    This one: https://www.rls.si/en/rmc22-commutat...mental-encoder
    I see, I believe I tried a similar version made by CUI but it was in the early stages of development and I had varying degrees of success with it.
    Those look similar, if so they are self calibrating, i.e. requires no scope to align.
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


  2. #14
    Member Azalin's Avatar
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    Default Re: Motor encoder alignment

    Yes. Just align the rotor to the zero point and set the encoder with a button.

    What I don't know is how to get the rotor to it's zero point. I came across a blog entry today. The poster says if you apply +5vdv to the U phase and - pole to the V phase then the rotor will move to the zero point. Sounded interesting to me.

    Sent from my MI 5s Plus using Tapatalk

    Suat
    Proud father, C# developer, Model heli pilot, newbie free time machinist for hobby


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    Default Re: Motor encoder alignment

    Quote Originally Posted by Al_The_Man View Post
    There are many encoders made this way now as Hall sensors have dropped out of favor now because the simulated hall tracks are much more accurate.
    I used to get mine from Renco, but now they have been taken over by Heidenhain, many of the models have been dropped. But there are many others.
    I have converted Fanuc AC servo motors to BLDC this way.
    You need to know the pole count of the motor, if you short the stator leads and rotate the motor by hand and count the 'bumps' per rev.
    AZALIN, I have never come across a 'Magnetic' encoder as far as I recall.
    Al..
    Thanks for that Al, I will have a look round and see what is available in the UK. Dave



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    Default Re: Motor encoder alignment

    Could you please explain the wiring and voltages? I'm confused if we apply DC voltage to the motor, and or encoder. Without a voltage on the motor windings, how do you find "zero" on the motor? Is it possible to do a slightly modified version of alignment with the motor ON the machine?
    Does the same procedure apply to a Yaskawa AC servo w/8192 Inc encoder?

    Quote Originally Posted by Al_The_Man View Post
    Here is the method, power is to Encoder ONLY. Waveform diag. shows all three waveforms at once.
    Al.




  5. #17
    Community Moderator Al_The_Man's Avatar
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    Default Re: Motor encoder alignment

    You rotate the BLDC motor in order that it will generate a AC wave form on the 3 phases.
    Both the A phase and the corresponding commutation pulse is monitored on a scope and the encoder turned until the commutation is as is shown on the PDF.
    IOW you check one phase at a time.
    AFAIK the Yaskawa AC servo is just that AC so the BLDC version may not apply as far as alignment .
    Al.

    CNC, Mechatronics Integration and Custom Machine Design

    “Logic will get you from A to B. Imagination will take you everywhere.”
    Albert E.


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