Regulation for asynchronous motors: High Dynamic Flux Control (HDFC) with VP600 up to 800V

The challenge: Optimum efficiency with asynchronous motors

The dynamic control (with regard to the torque) of asynchronous motors is very demanding because asynchronous motors (ACIM) without magnets do not have a permanent magnetic field and the magnetic field of the rotor can only be built up with a certain time delay. If you add the requirement to operate the motor with optimum efficiency at every operating point – from low to maximum load, then simple control strategies often become impossible.

Technological background

For an optimum control, the magnetic flux is calculated in real time depending on all required controller variables, such as temperature, voltage, current, speed, or torque, using a special physical model. As a result, the rotor resistance is also known depending on the temperature, among other things.

This highly dynamic calculation of the motor flux is implemented with the special FPGA-based controller cascade from ARADEX, which makes real-time calculations possible in the first place due to their speed and deterministic processes.

These basic principles make it possible to almost completely compensate for the strong temperature-dependent effects in an asynchronous motor and considerably increase the efficiency.

 Your advantages

  • Up to 5x faster torque change, for example, from acceleration to recuperation or with a change in direction of the rotor rotation
  • Optimized terminal voltage for up to 4% better efficiency in a very wide rotational speed range

Application areas

  • Industrial spindles:  Ramp-up times of the spindles accelerated by a factor of up to 1.4
  • Example: Milling operations with many tool changes
  • E-mobility: Change from feed to recuperation
  • Example: Utility vehicles in urban traffic with stop and go
  • Example: Work machines in mining with large load changes: Faster reaction to battery voltage

Any more questions?

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