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HDFC
Overview
Challenge
Background
Application areas
Tutorial

High Dynamic Flux Control (HDFC) in the VP600

Next-level asynchronous motors:
High Dynamic Flux Control (HDFC) in the VP600

Since asynchronous motors do not have a permanent magnetic field of the rotor, this must first be built up by flux injection if necessary. This process often takes several hundred ms in classical control strategies. HDFC significantly shortens this time and expands the application range of asynchronous motors due to the higher dynamics.

Fast responding

Up to 5x faster torque change, e.g., from acceleration to recuperation

Flexible adaptation to the motor

Optimum adaptation to motor characteristics that changes with temperature

Improved efficiency

Increased real efficiency due to improved utilization of the HV voltage

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 demand. If you add the requirement to operate the motor with the most 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 is what makes real-time calculations possible in the first place due to its 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.

Application areas

  • Electric propulsion: Change from feed forward to recuperation
  • Commercial vehicles in urban traffic with frequent braking and accelerating
  • Working machines in mining with large load changes and adaptation to fluctuations in the supply voltage
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Video-Tutorial HDFC

The video below on the HDFC module explains how a motor for which not all technical parameters are known can be connected to an inverter.