Separately Excited Motor Controller Calibration
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Solution Overview
Problem
The existing solutions for improving the accuracy of external parameter values in motor controllers require high-precision sensors and signal processing circuits, leading to increased hardware costs and reduced system reliability.
Innovation Solution
A system and method that utilize a digital signal processor, calibration coefficient generating module, and storage module to calculate and apply calibration coefficients, allowing for the adjustment of parameter values to achieve higher precision without the need for high-precision sensors and signal processing, using a calibration coefficient generated from the difference between actual and processed values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-precision sensors and signal processing circuits are employed to improve the accuracy of external parameter values, then measurement precision is improved, but hardware cost and device complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating calibration coefficients during a calibration phase and storing them in memory. These coefficients are computed in advance using the formula K = V_actual / V_processed, where V_actual is the actual parameter value and V_processed is the processed parameter value from the digital signal processor. During normal operation, the controller simply retrieves and applies these pre-computed coefficients to correct parameter values, avoiding the need for complex real-time calibration calculations and eliminating the requirement for high-precision hardware circuits.
2Measurement precision
If high-precision sensors and signal processing circuits are used to improve measurement precision, then accuracy of external parameter value is improved, but reliability of the system decreases
Solution Approach 1:
The patent applies the copying principle by creating a simplified computational model that replicates the function of high-precision hardware. Instead of using expensive, complex, and potentially unreliable high-precision sensors and circuits, the system uses a software-based calibration approach where a calibration coefficient (a numerical copy of the correction factor) is computed and stored. This coefficient copy allows the system to achieve high measurement precision through simple arithmetic operations rather than complex hardware, thereby improving reliability.
3Measurement precision
If high-precision devices are employed in signal acquiring and processing circuits to improve accuracy, then manufacturing cost increases
Solution Approach 1:
The patent applies parameter changes by transforming the problem from a hardware precision issue to a software parameter adjustment issue. Instead of changing the physical parameters of the hardware (using high-precision sensors and circuits), the system changes the parameter of the measurement process by introducing a calibration coefficient that adjusts the processed parameter value. This coefficient is calculated as K = V_actual / V_processed and applied to correct future measurements, thereby achieving high accuracy through parameter transformation rather than hardware upgrades.
Data Source
AI summary
A system and a method of generating an external parameter value for a separately excited motor controller are disclosed, the system including: a digital signal processor to convert a received analog electrical signal into a digital signal and to scale the digital signal, so as to generate a parameter value in conformity with a data format of the system; an external parameter generating module to adjust the parameter value with a calibration coefficient to obtain the external parameter value; the calibration coefficient being generated by a calibration coefficient generating module and being pre-stored in a calibration coefficient storing module; and a calibration coefficient generating module to read the parameter value generated by the digital signal processor and obtain an actual measuring value as a reference parameter value, to calculate a difference value between the parameter value from the digital signal processor and the reference parameter value, and to generate the calibration coefficient from a ratio of the reference parameter value to the parameter value obtained from the digital signal processor if the difference value exceeds a preset value.