Regenerative resistor

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250 Watt 82 ohm regenerative resistor suitable for Argon drive
Regenerative resistors are usually a part with servo systems to absorb returned energy from decelerating or braking servo axis.

Servo drive with motor can act two ways: energy supply and energy generator. The generator behavior occurs during decelerations and this causes current flow from motor to drive power supply capacitors. If that generated energy is not absorbed anywhere, the voltage of capacitors will rise above overvoltage threshold and trigger an software clearable overvoltage fault.

Overvoltage faults[edit | edit source]

Scenarios where returned energy is causing the rise of HV DC bus voltage:

  • Deceleration of motor speed when there is significant amount of energy stored in mechanical motion (rotating inertia or moving mass). This typically occurs with spindles and linear axes.
  • Sudden reversal of torque setpoint. This can generate voltage spike even when motor is standing still. This typically occurs in high bandwidth torque control applications (such as Force feedback system (FFB)). These spikes are very short and an added capacitor to HV DC bus and/or low resistance regenerative resistor can provide a solution.

See also[edit | edit source]

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