The maximum rate of change in current (di/dt) is dictated by the bus voltage V and the motor inductance L, where di/dt = V/L. A minimum amount of inductance is required for a stable current loop.

  • Too much motor inductance can make the current loop sluggish
  • leading to difficulties during the tuning process and limiting the overall system response
  • If the motor inductance does not meet the minimum requirement then the current loop becomes difficult to control and will begin to oscillate
  • causing the motor to overheat

ADVANCED Motion Controls' Capabilities

  • Both AxCent and DigiFlex® Performance drives can be tuned to achieve the best possible performance for a given motor's inductance and system bus voltage
  • External inductors can be added to increase the load inductance to specified levels
  • The switching frequency can be increased to reduce oscillations
  • A large selection of servo drives over a wide range of power allows a higher or lower bus voltage to be selected