Motor Control Phase Correction for Sensor Attachment Errors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The efficiency of motor control systems is compromised due to errors in the attachment position of position sensors, which affect the phase adjustment of drive signals, leading to suboptimal motor performance.
Innovation Solution
A motor control apparatus that includes a current detecting unit, rotation position detecting unit, phase difference calculating unit, storage unit, and correcting unit, which calculates and corrects phase differences to generate a corrected rotation position signal, optimizing the phase of the drive signal based on phase correction information stored in the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If phase adjustment is performed based on position sensor information, then motor control is enabled, but motor efficiency cannot be optimized due to attachment position errors
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual phase difference between the position sensor signal and the induced voltage, then using this detected phase difference to correct the drive signal phase. The phase difference detection unit measures the actual phase relationship, and the correction unit adjusts the drive signal accordingly, creating a closed-loop system that compensates for attachment position errors and optimizes motor efficiency.
Solution Approach 2:
The patent changes the phase parameter of the drive signal based on the detected phase difference. By dynamically adjusting the phase of the drive voltage according to the measured phase difference between the position sensor signal and induced voltage, the system compensates for attachment position errors and achieves optimal motor efficiency under varying operating conditions.
2Ease of manufacture
If position sensor attachment position has errors, then sensor installation is simplified, but motor efficiency optimization is compromised
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual phase difference between the position sensor signal and the induced voltage, then using this detected phase difference to correct the drive signal phase. The phase difference detection unit measures the actual phase relationship, and the correction unit adjusts the drive signal accordingly, creating a closed-loop system that compensates for attachment position errors and optimizes motor efficiency.
Solution Approach 2:
The system performs self-correction by automatically detecting its own phase difference error and adjusting the drive signal phase accordingly. The phase difference detection and correction units enable the motor control apparatus to self-compensate for position sensor attachment errors without requiring external calibration or manual adjustment, maintaining optimal efficiency despite installation variations.
3Loss of energy
If phase correction is implemented, then motor efficiency is optimized, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into unified units to reduce overall system complexity. The phase difference detection unit can detect phase differences across different operating conditions, and the correction unit applies corrections to various drive signals. This multi-functional approach allows a single correction mechanism to handle diverse scenarios, minimizing the need for separate specialized components.
Solution Approach 2:
The patent replaces complex mechanical calibration systems with an electrical/electronic solution. Instead of requiring mechanical adjustment mechanisms for position sensor alignment, the system uses electrical phase detection and correction circuits to achieve the same effect, simplifying the overall device structure while maintaining or improving correction accuracy.
Data Source
AI summary
According to an embodiment, a motor control apparatus includes a current detecting unit that detects a motor current, a rotation position detecting unit that detects a rotation position of a rotor, a phase difference calculating unit that calculates first phase difference information between the motor current and the rotation position when a rotation speed of a motor is equal to or lower than a predetermined rotation speed and second phase difference information when the rotation speed of the motor exceeds the predetermined rotation speed, a storage unit that stores phase correction information based on the first phase difference information, a correcting unit that outputs a corrected rotation position signal and a drive unit that generates a drive signal to be output to the motor.