Talk:Servo drive

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Good Morning

I have two FDA-B24 Servo Drives for repair

Can anyone please help me with information or general components that fail on them as i do not have a test unit

Thanks —Preceding unsigned comment added by 196.207.32.37 (talkcontribs)

1. This really isn't appropriate for Wikipedia, which doesn't give advice.
2. Try calling Industrial Electronic Repairs (UK) at +44 (0) 1462 671001. They repair servo drives, including the "FDA-B24 (Unbadged Manufacturer) Servo Drive." [1]. --John Nagle (talk) 15:18, 2 July 2008 (UTC)


What is the life expectancy of an AC Servo Drive in normal working conditions on a CNC griniding machine (compatable) —Preceding unsigned comment added by 122.169.188.117 (talk) 16:05, 27 January 2010 (UTC)

Don't servos already do all of this internally?[edit]

Is this article about the control electronics that are INSIDE every ordinary servo? Servos already have pots in them that they internally use for position feedback, this is what separates them from just dumb motors. They don't need an additional EXTERNAL mechanism to monitor feedback and complete their control loop, it's redundant no? Roidroid (talk) 03:04, 16 May 2013 (UTC)

  • No, not every servomotor has its own feedback, drive or amplifier built in. I think you are confusing the little RC servos which are quite simple with brushed and brushless servo motors used in industrial motion control and robotics (which is what this article is aimed at). They don't use pots but instead use rotary encoders or in some special cases (as in linear motors) linear encoders which are either incremental (quadrature) or absolute. The encoders might be integrated into the motor or are attached mechanically so they can be easily changed or serviced. Some systems employ both and use the rotary encoder to close the velocity loop of the motor and a highly accurate linear encoder to close the position loop. The drive may be dumb and accept a direction command and some sort of intensity (speed or torque)command which is analog or PWM. A computer closes the loop by commanding the drive to move the motor and watching the encoder until its position is met. Some drives include a computer to close the loop and they receive position commands(eg. move 100mm, 5.68 revs or 5000 encoder counts) There are smaller servo motors that include the drive and feedback in one unit which are frequently used in positioning systems on assembly or packing lines. They are compact and simplify the wiring needed. Even the RC servos need a computer to close the loop and are commanded to turn clockwise until the feedback position is met. The pot is connected to a voltage supply and the wiper output sends a voltage proportional to its position to an analog input on a computer, usually a small microcontroller. Thaddeusw (talk) 21:49, 30 September 2013 (UTC)