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Recent content by lmc82

  1. lmc82

    3-Phase Brushless DC Motor Loses Torque

    Thanks Mike, It really does seem to be a temperature issue at this stage. Unfortunately we can't get a decent temperature reading from the motor given the motor arrangement. The thermocouple we currently have is placed on metal work attached to the motor. I think we need to get some more...
  2. lmc82

    3-Phase Brushless DC Motor Loses Torque

    Oh, and we have placed thermocouples on the motor housing and seen no significant temperature rise.
  3. lmc82

    3-Phase Brushless DC Motor Loses Torque

    The motor is interference fit to the base of the gimbal, which is basically a large heat sink. It does look like it could be temperature related, given that the problem doesn't occur before applying the vibration profile. The information on the motor is a bit sparse in terms of derating due to...
  4. lmc82

    3-Phase Brushless DC Motor Loses Torque

    The motor has 3 phases and no brushes, the commutation is done electronically. You have a set of switches for each phase (IGBT, MOSFET, etc), connecting the phase to either DC Bus or Ground. Just Google "Brushless DC Motor". The "3-phase" has nothing to do with "DC", the motor has 3 phases. It...
  5. lmc82

    3-Phase Brushless DC Motor Loses Torque

    Hi, I've searched this thread and can't find an answer to the following question, so here goes. We have a camera pan and tilt gimbal with direct drive 3-phase brushless DC motors mounted on each axis. We have the control system setup so that the camera is pointing to one spot regardless of the...
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