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Thread: Battery recommendation for mx-64t dynamixels

  1. #1
    adityassripada Guest

    Battery recommendation for mx-64t dynamixels

    We are using a set of 6 MX64-T Dynamixels connected in a daisy chain for a biped.Which batteries will be ideal to power up these Dynamixels ? Each of the Dynamixel draws 4.1A at 12V.

    Can we connect the batteries directly to the Open CM 9.04's battery slots directly to power-up the motors ?

    Controller : Open CM-904B

    Motors : MX-64T Dynamixels

  2. #2
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    Re: Battery recommendation for mx-64t dynamixels

    The MX-series servos work best with 12V (3S LiPo). The battery should be labeled with a 'C' rating that, combined with the capacity, will tell you how much current the battery can safely provide to the servos (2300mAh capacity * 15C_continuous_rating = 34.5A continuous). The 'recommended' torque is ~1/5 of the stall torque and the MX-64T should only require 4.1A when stalled, so the sustained current of all the servos should be a bit less than 6*4.1A but failing to meet the surge current requirements can cause serious issues (servos can behave erratically and sometimes reset their IDs).

    The pair of series wired, two-pin battery connectors on the OpenCM-904 are only rated ~2A, and intended primarily for XL-320 servos with the pair of 1S LiPo batteries of the Darwin-Mini (AX-12 are usable when powered through the CM-904 with 3S LiPo, but it is still best to add a powered hub). You will need to power the MX-64T servos through something like the trossen AX/MX powered hub or custom cables to connect the battery to the power and ground pins of the servos.
    Please pardon the pedantry... and the profanity... and the convoluted speech pattern...
    "You have failed me, Brain!"
    bleh

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