Braking in Angle Control Mode (Optional)

You can optionally install an additional brake to fix the motor in a specific angle position during standstill. This feature is only available for PTC2EM and PTV2EM applications. You cannot use this additional brake for other purposes.

This additional brake is available only for the following control modes:

  • PTC2EM:
    • T / phi
    • Ud Uq / phi
    • Id Iq / phi
  • PTV2EM:
    • T / phi
    • alpha/phi

When Can I Apply the Brake?

You can apply this brake only when the test bench drive is in standstill (i.e., X ~ 0 with X = T, X = Ud Uq or X = Id Iq).

The most common case for using the angle control mode is when the brake activates after the angle is reached, and then the torque (T/phi), current (Id+Iq/phi) or voltage (Ud+Uq/phi) for the DUT is set.

However, the brake can remain inactive while all of the setpoints are set synchronously. This may lead to a strong deviation of the angle position (at least for a short time), since the angle control usually is not as fast as the torque control.

If braking is active and the test bench is shut down, this shutdown is executed in control mode X / phi. After the shut down succeeds, the brake is released if X ~ 0. Afterward, the mode is changed to standstill control mode.

Applying the Brake

Before you apply the brake in angle control mode, you must ensure the following conditions are met.
  • One of the angle control modes is active:
    • T / phi
    • Ud Uq / phi
    • Id Iq / phi
  • Test bench drive is in standstill (no torque applied).
Note If the brake is applied, you can no longer change the angle. The brake can only be released in standstill (Torque, UdUq, IdIq ~ 0).
Complete the following steps to apply the brake.
  1. Enter the setpoint for the angle[*].
  2. Wait until the setpoint is reached.
  3. Open the add-on userbox Brake control.
  4. Click apply to fix the motor.
    The Brake State indicator turns on to indicate that braking is active.
  5. Click release to stop braking.
    The Brake State indicator turns off.