RFID Memory for Electrical Drive Commissioning
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Solution Overview
Problem
The commissioning of electrical drives requires an identification run to estimate machine-specific inductances, which complicates replacing faulty components and necessitates free rotation of the electrical machine, making it difficult to mechanically connect the machine to its load during the process.
Innovation Solution
A system that includes a memory device attached to the electrical machine with parameter data expressing individual machine-specific inductances, allowing for direct loading of this data into an electronic power converter via a data transfer interface, eliminating the need for an identification run and enabling easy configuration of new components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an identification run is performed to estimate machine-specific inductances, then the torque control accuracy is improved, but the commissioning process becomes more complex and time-consuming
Solution Approach 1:
The patent applies preliminary action by pre-determining the inductance values during the manufacturing process and storing them in a memory device attached to the electrical machine. This eliminates the need for performing an identification run during commissioning, as the parameters are already available when needed for vector control.
Solution Approach 2:
The patent replaces the mechanical identification run process with an electronic data retrieval system. Instead of mechanically rotating the machine and measuring currents to determine inductances, the system uses a memory device with a data interface to electronically provide the pre-stored inductance values directly to the electronic power converter.
2Measurement precision
If an identification run is performed to estimate machine-specific inductances, then the torque control accuracy is improved, but the electrical machine cannot be mechanically connected to its load during the process
Solution Approach 1:
The inductance values are determined and stored in the memory device during manufacturing, before the machine is deployed. This preliminary action allows the machine to be mechanically connected to its load during commissioning without needing to perform an identification run that would require free rotation.
3Measurement precision
If an identification run is performed to estimate machine-specific inductances, then individual machine parameters are obtained, but replacing faulty components becomes more difficult
Solution Approach 1:
The patent replaces the mechanical identification run process with an electronic data retrieval system. When a component is replaced, the new component's memory device automatically provides its pre-stored inductance values through the data interface, eliminating the need to perform a time-consuming identification run and allowing immediate commissioning.
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
A system for commissioning an electrical drive of e.g. a mobile working machine comprises a memory device (101) attached to or otherwise associated with an electrical machine (120) of the electrical drive and data transfer equipment (102, 103, 105) for reading parameter data from the memory device and for loading the parameter data to an electronic power converter (121) of the electrical drive. The data transfer equipment can be based on, for example, the RFID-technology. The parameter data expresses one or more inductances which are specific to the electrical machine as an individual electrical machine. The system makes an identification run, which is typically a part of commissioning of a vector controlled electrical drive, needless because the machine specific parameter data is available in the memory device that is attached to or otherwise associated with the electrical machine.