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  1. There are a few reasons, but this one normally gives you an indication.
    Ok, lets say you have a machine with 8 axis and each axis needs a servo, that is not too large.
    you can get 8 AC servo motors and driver and you will be paying more because each driver has its own power supply.
    with the DC option, you will have 8 DC servo drivers and a large power supply.
    Also DC servo motors are typically low voltage DC, so the current is higher, so typically the motors dont go too big (under a KW)
    Personally, i would not even consider a DC servo system, unless you know why you need it. AN ac servo system is typically a better option.

    Quote Originally Posted by Agathon View Post
    OK, that's a very concise reply, but why buy a DC over and AC and vice versa?

  2. #22
    Quote Originally Posted by Gary View Post
    There are a few reasons, but this one normally gives you an indication.
    Ok, lets say you have a machine with 8 axis and each axis needs a servo, that is not too large.
    you can get 8 AC servo motors and driver and you will be paying more because each driver has its own power supply.
    with the DC option, you will have 8 DC servo drivers and a large power supply.
    Also DC servo motors are typically low voltage DC, so the current is higher, so typically the motors dont go too big (under a KW)
    Personally, i would not even consider a DC servo system, unless you know why you need it. AN ac servo system is typically a better option.
    Right, so AC servo drivers aren't typically 240vac SP input then and need a step-down transformer?

  3. No, AC is AC, regardless of the voltage.
    Typically single phase goes up to about 1.5KW
    For a hobby machine, its unlikely you will need anything that big.
    Even a mill like Bridgeport MDI /Interact can use 750W easily.

    Quote Originally Posted by Agathon View Post
    Right, so AC servo drivers aren't typically 240vac SP input then and need a step-down transformer?

  4. #24
    Quote Originally Posted by Gary View Post
    No, AC is AC, regardless of the voltage.
    Typically single phase goes up to about 1.5KW
    For a hobby machine, its unlikely you will need anything that big.
    Even a mill like Bridgeport MDI /Interact can use 750W easily.
    OK, so just to be clear. A 400W AC servo motor would typically be coupled to a driver powered by AC at a voltage less than 240v? So is the power supply simply a step-down transformer or is there more to it?

  5. it totally depends on what the bus voltage of the motor is.
    To make it easy, if and when you buy them get a matched pair with cables, or talk directly to the company and get advise on what they suggest for the application.

  6. #26
    Quote Originally Posted by Gary View Post
    it totally depends on what the bus voltage of the motor is.
    To make it easy, if and when you buy them get a matched pair with cables, or talk directly to the company and get advise on what they suggest for the application.
    Thanks - I'll email you in the next few days.

  7. #27
    Quote Originally Posted by Gary View Post
    Personally, i would not even consider a DC servo system, unless you know why you need it. AN ac servo system is typically a better option.
    Me too. And honestly valuing my time i will not consider separate PSU but a pure plug and play system.
    project 1 , 2, Dust Shoe ...

  8. #28
    Ger21's Avatar
    Lives in Detroit, United States. Last Activity: 4 Hours Ago Has been a member for 6-7 years. Has a total post count of 603. Received thanks 83 times, giving thanks to others 0 times. Referred 1 members to the community.
    OK, so just to be clear. A 400W AC servo motor would typically be coupled to a driver powered by AC at a voltage less than 240v?
    No, most of the currently available 400w AC servos are 220-240V
    Gerry
    ______________________________________________
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  9. #29
    Quote Originally Posted by Ger21 View Post
    No, most of the currently available 400w AC servos are 220-240V
    Nice.

  10. #30
    What do you think of this: http://www.ebay.co.uk/itm/Samsung-RS...-/282340382590

    Might it be suitable for my app or am I barking up the wrong tree?

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