Motor Pole Offset Detection Using Multi-Angle Encoder Feedback
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Solution Overview
Problem
The permanent magnet-assisted synchronous reluctance motor (PMaSynRM) is unsuitable for traditional magnetic pole offset angle learning methods, making it difficult to effectively detect and obtain the correct magnetic pole offset angle, which is crucial for improving motor drive system control performance.
Innovation Solution
A motor detection method and device that includes providing an excitation current command to drive the motor to rotate at specific angles, detecting feedback angles using an encoder, and calculating the magnetic pole offset angle using the first and second feedback angles, with the option to add a third angle when the second feedback angle is greater than the first, to correct the offset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional magnetic pole offset angle learning method is used, then the method is simple to implement, but it cannot obtain the correct magnetic pole offset angle for PMaSynRM
Solution Approach 1:
The detection process is divided into multiple discrete steps: setting different excitation currents, rotating the motor to specific positions, detecting feedback angles at each position, and calculating the offset angle through comparison. This segmentation allows accurate measurement without requiring complex detection equipment.
Solution Approach 2:
The method performs preliminary actions by first rotating the motor to a first position and detecting the first feedback angle, then rotating to a second position and detecting the second feedback angle before calculating the offset. This preliminary data collection enables accurate offset angle determination for PMaSynRM.
2Measurement precision
If self-learning time is extended to improve accuracy, then learning accuracy improves, but system response time decreases
Solution Approach 1:
The detection method uses periodic actions by rotating the motor to specific positions (first position, then second position) and performing detection at each position in sequence. This structured periodic approach ensures accurate data collection while maintaining efficient timing.
Solution Approach 2:
The method skips unnecessary intermediate steps by directly rotating to the required positions and performing measurements. By rushing through the essential detection steps at critical positions rather than continuous monitoring, the system achieves high accuracy without excessive learning time.
Data Source
AI summary
A motor detection method includes the following steps. An excitation current command is provided to a motor device, and the motor device is driven to rotate at the first angle. The first feedback angle of the motor device in the first resting position is detected and obtained. The motor device is driven to rotate at the second angle according to the excitation current command. The second feedback angle of the motor device in the second resting position is detected and obtained. The magnetic pole offset angle of the motor device is calculated according to the first feedback angle and the second feedback angle.