Electric Machine Torque Verification Using Sensor Cross-Checks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for controlling torque in electric machines, particularly high-performance motors with permanent magnets, fail to verify errors in sensor readings, leading to incorrect torque estimation and driving errors.
Innovation Solution
A method and system that detect the angular position of the rotor and current values using sensors, estimate torque, and compare computed torque values to verify accuracy, using formulas and processing by a microprocessor to ensure the difference is within a set margin, employing position, current, and direct voltage sensors, and an electronic control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If torque is estimated using position sensor and current sensor readings, then torque control is achieved, but sensor reading errors cause incorrect torque estimation
Solution Approach 1:
The patent implements a feedback mechanism where the estimated torque is continuously compared with the actual measured torque from the torque sensor. This closed-loop feedback allows the system to detect discrepancies caused by sensor reading errors and correct the torque estimation accordingly, thereby improving both measurement precision and reliability
Solution Approach 2:
The patent introduces an intermediary verification step where the computed torque serves as a reference to validate the estimated torque. By using this intermediary comparison, the system can identify and filter out erroneous sensor readings before they affect the final torque control, resolving the contradiction between achieving torque control and ensuring error-free estimation
2Productivity
If sensor readings are used for torque control, then torque estimation is obtained, but reading errors cause driving errors
Solution Approach 1:
The continuous feedback loop comparing estimated and actual torque enables real-time detection of sensor errors that would otherwise degrade torque control performance. This feedback mechanism ensures high productivity by maintaining accurate torque control while simultaneously providing error detection capability
Solution Approach 2:
The patent replaces direct reliance on potentially erroneous sensor readings with a computational verification system. By substituting the mechanical/sensor-based torque measurement with a software-based comparison between estimated and actual torque, the system achieves both high productivity and reliability
Data Source
AI summary
A control method of an electric machine is described, including a first step of detecting the angular position of a rotor of the electric machine; a second step of detecting the values of the alternate current next to at least two phases of the input current to the electric machine; a third step of detecting the values of voltage and direct current supplied as input to the inverter by the electric supply means; a fourth step of estimating the torque supplied by the electric machine performed by processing data detected in the first and second step; a fifth step of computing the torque supplied by the electric machine performed by processing data detected in the third and first step; a sixth step of comparing the value of the computed torque and the value of the estimated torque; a control system and a motor comprising such system are further described.