Motor Voltage Reconstruction From ADC Oversampling for Phase Plausibility
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Solution Overview
Problem
Existing motor control systems lack efficient methods to verify the plausibility of motor voltages in three-phase motors, particularly in safety-critical applications, where erroneous readings can lead to unsafe conditions.
Innovation Solution
Implementing a method for motor voltage reconstruction using Analog to Digital Converter (ADC) oversampling and averaging, which allows for plausibility checks of motor voltages by measuring and reconstructing phase voltages in an alpha-beta reference frame, reducing the need for additional hardware and computational power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If motor voltage plausibility verification is implemented using traditional methods, then safety is improved, but device complexity and computational power requirements increase
Solution Approach 1:
The patent creates a virtual model (copy) of the motor system in the alpha-beta reference frame that replicates the three-phase motor behavior using only two measured phases. This virtual model allows voltage plausibility verification without requiring additional physical sensors or complex hardware, thereby maintaining safety while reducing device complexity
Solution Approach 2:
The patent replaces the need for additional physical measurement hardware with a mathematical/computational model. By using coordinate transformation and virtual reconstruction in the alpha-beta reference frame, the system substitutes mechanical/physical measurement components with software-based calculations, reducing both hardware complexity and computational burden
2Measurement precision
If all three motor phase voltages are measured directly, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential information needed for voltage verification by measuring just two of the three phase voltages. The third phase voltage is then derived through mathematical reconstruction in the alpha-beta reference frame, eliminating the need for additional measurement hardware while maintaining sufficient measurement precision for safety verification
Solution Approach 2:
The patent makes the two measured phases serve multiple functions: they are used both for normal motor control and for reconstructing the third phase voltage for plausibility verification. This multi-functionality allows the system to achieve comprehensive voltage monitoring without requiring dedicated measurement channels for each phase
Data Source
AI summary
A method for motor voltage reconstruction by Analog to Digital Converter (ADC) oversampling and averaging includes measuring a first phase voltage with an ADC, the first phase voltage proportional to a first duty cycle of a first Pulse Width Modulation (PWM) signal. A second phase voltage is measured with the ADC, the second phase voltage proportional to a second duty cycle of a second PWM signal, wherein the first PWM signal and the second PWM signal control consecutive phases of a three-phase motor. A third duty cycle of a third PWM signal of the three-phase motor is reconstructing from the first phase voltage and the second phase voltage.