Hybrid Motor Orientation Correction via Voltage Feedback
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Solution Overview
Problem
Conventional motor control techniques for permanent magnet variable speed electric motors face performance degradation due to position sensor errors caused by incorrect installation orientation or mapping, leading to increased energy losses and inefficiencies in hybrid vehicles.
Innovation Solution
A method is implemented to detect and correct motor orientation errors by calculating a calibration factor using signals from angular and voltage sensors, determining the error angle, and applying an orientation correction factor, which is stored in the inverter's memory, allowing for precise alignment and reduced energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a position sensor is installed on the motor rotor to provide rotor position information, then motor control precision is improved, but the system becomes vulnerable to installation errors causing position sensor offset
Solution Approach 1:
The system performs feedback calibration by measuring the actual rotor position through voltage signals during motor rotation, comparing it with the position sensor readings, calculating the offset angle, and applying correction to the position sensor data. This feedback mechanism eliminates installation errors without requiring perfect initial installation.
Solution Approach 2:
The patent replaces reliance on mechanical installation precision with an electrical calibration approach. Instead of depending on perfect mechanical alignment of the position sensor, the system uses voltage signal analysis and software-based offset correction to achieve accurate rotor position measurement regardless of installation variations.
2Manufacturing precision
If physical measurement and manual re-installation are performed to compensate for incorrect motor installation, then installation accuracy is improved, but manufacturing time and cost increase
Solution Approach 1:
The system performs self-calibration automatically during normal operation or initialization. The motor controller autonomously measures rotor position, calculates offset, and applies correction without requiring external intervention, manual measurement, or disassembly, thereby maintaining high productivity while achieving accurate installation.
Solution Approach 2:
The calibration process is performed preliminarily during system initialization or first operation, establishing the correct reference frame before normal operation begins. This preliminary action prevents future control errors without requiring subsequent manual adjustments or production interruptions.
3Device complexity
If the motor is operated without position sensor calibration, then system simplicity is maintained, but energy losses increase due to control errors
Solution Approach 1:
The system uses feedback from voltage signals and rotor position measurements to continuously monitor and correct control accuracy. By comparing actual motor response with commanded values, the system identifies and compensates for position errors, minimizing energy losses without adding complex hardware.
Solution Approach 2:
The calibration process involves changing the reference parameter (position offset angle) based on measured voltage signals. By adjusting this parameter, the system optimizes control accuracy and minimizes energy losses. The corrected offset angle is stored and applied during normal operation to maintain efficient performance.
Data Source
AI summary
Systems, computer readable media storing instructions, and computing device-implemented methods include receiving one or more signals that represent an angular speed of a permanent magnet electric motor of a hybrid electric vehicle, receiving a signal representing a voltage from the electric motor, determining if the angular speed is within a predetermined threshold, calculating an error angle representing a correction factor for an alignment of the electric motor based on a ratio of the voltage and the angular speed, determining if the error angle indicates that the motor is installed in a correct or an incorrect orientation, and adding an orientation correction factor to the error angle.