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IndustryArena Forum > CNC Electronics > Servo Motors / Drives > Servo driver for Fanuc Model 5 servo motors

Thread: Servo driver for Fanuc Model 5 servo motors

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  1. 06-08-2014, 06:32 PM #1
    AlMolp
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    Servo driver for Fanuc Model 5 servo motors

    Hello, I have a colchester CNC lathe with fanuc control I want to retrofit. The question is can I use the Fanuc model 5 motors with a AMC BE25A20 servo drive? is it other drive that would suit this motors?
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  2. 06-08-2014, 07:31 PM #2
    Al_The_Man's Avatar
    Al_The_Man
    Al_The_Man is offline Community Moderator
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    Re: Servo driver for Fanuc Model 5 servo motors

    Unfortunately No.
    You either need a convertor for the Fanuc proprietary commutation or change the encoders to BLDC type.
    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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  3. 06-08-2014, 08:14 PM #3
    AlMolp
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    Re: Servo driver for Fanuc Model 5 servo motors

    Hello,thanks for the reply, I was thinking of use the AMT303 encoders from CUI INC for conmutation, but my question is what is the difference if there is any between an AC Servomotor as says in Fanuc motor and a BLDC motor as says in AMC driver. Is the same an AC servomotor and a BLDC?
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  4. 06-08-2014, 08:42 PM #4
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    Al_The_Man
    Al_The_Man is offline Community Moderator
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    Re: Servo driver for Fanuc Model 5 servo motors

    Fanuc have a proprietary pseudo sine wave commutation, there is a member here that makes a convertor.
    I have tested the CUI BLDC encoders and they have very inconsistent results.
    Fanuc run them as AC sinusoidal servo's as opposed to BLDC, they will run in BLDC with the right convertor/encoder.
    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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