Rotor Position Angle Plausibility Check Circuit
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Solution Overview
Problem
Existing methods for determining and verifying the rotor position angle in synchronous and asynchronous machines lack effective plausibility checks, leading to potential errors and noise susceptibility.
Innovation Solution
A control circuit and method that determine a rotor position angle at one time and use a computational model to predict the angle at a subsequent time, checking if the difference between the predicted and actual angles exceeds a threshold to indicate plausibility, with optional use of phase-locked loops and state variable filters for preprocessing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a rotor position sensor is used to determine the rotor position angle, then the rotor position angle can be obtained for controlling synchronous and asynchronous machines, but the determined angle is susceptible to errors and lacks effective plausibility verification
Solution Approach 1:
The system performs preliminary actions by determining a first expected rotor position angle from a computational model using previous measurement data before the actual measurement is obtained. This expected angle is calculated in advance based on the machine's kinematic model and prior rotor position data, enabling proactive verification rather than reactive correction
Solution Approach 2:
The system implements feedback by comparing the actually measured rotor position angle with the first expected rotor position angle derived from the computational model. The difference between these two values is evaluated against a threshold to determine measurement plausibility, creating a closed-loop verification mechanism that continuously monitors and validates sensor readings
2Productivity
If conventional rotor position measurement methods are used, then the rotor position angle can be determined, but false alarms and errors occur due to lack of plausibility checking
Solution Approach 1:
The system applies preliminary anti-action by preemptively checking the plausibility of rotor position measurements before they are used for control operations. By evaluating whether the measured angle deviates beyond the threshold from the expected angle calculated from the computational model, the system prevents erroneous measurements from causing false alarms or control errors, thereby maintaining operational continuity
3Device complexity
If no plausibility check is implemented, then the control system remains simple, but errors in rotor position angle lead to control inaccuracies
Solution Approach 1:
The control circuit performs preliminary calculation of an expected rotor position angle based on the computational model and previous measurements before the actual measurement arrives. This pre-computed reference value enables immediate plausibility verification without adding complex hardware, as the verification logic simply compares the incoming measurement with the pre-calculated expected value
Solution Approach 2:
The system implements self-service by using its own computational model and previous measurement data to generate the expected rotor position angle, which then serves as the reference for verifying new measurements. The system validates its own measurements using internally generated expectations rather than requiring external verification systems
Data Source
AI summary
The present invention provides a control circuit (10; 110; 210; 310) and a method for checking the plausibility of a rotor position angle. The control circuit is designed with: a rotor position angle determination device (12) for determining a first rotor position angle, φ(tk), at a first time, tk, and at least one second rotor position angle, φ(tk−1), at a second time, φk−1, before the first time, tk; a computing device (14; 114; 214; 314) for determining a rotor position angle, mod(tk), to be expected at the first time, tk, from a computational model of the computing device (14; 114; 214; 314) using at least the second rotor position angle, φ(tk−1); and a plausibility-checking device (16) for outputting a signal (51) which indicates the determined first rotor position angle, φ(tk), as plausible if an amount of a difference between the rotor position angle, mod(tk), to be expected and the determined first rotor position angle, φ(tk), does not exceed a predetermined threshold value.