Permanent Magnet Synchronous Motor Unidirectional Chaotic Speed Control
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Solution Overview
Problem
Existing methods for controlling the rotation speed of permanent magnet synchronous motors often result in bidirectional chaotic motion, which can reduce mechanical device lifespan and limit flexibility in industrial applications, while current chaos control methods like delayed feedback and tracking control have limitations such as restricted speed changes and inflexibility.
Innovation Solution
A method involving digital signal processing to collect and transform current and angular position data, using CLARK and PARK transformations, and implementing PI regulation and delayed feedback to generate single-direction chaotic rotation speed through space vector modulation for a permanent magnet synchronous motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If delayed feedback control method is used to generate chaotic motion, then chaotic rotation speed can be achieved, but the motor will exhibit bidirectional rotation (positive and negative speed) which reduces mechanical device lifespan
Solution Approach 1:
The patent applies preliminary anti-action by introducing a speed threshold value and preventing the motor speed from reaching zero through control logic. The controller monitors the instantaneous speed and ensures it remains above the threshold, thereby preventing bidirectional rotation before it can occur and protecting mechanical devices from wear caused by frequent start-stop cycles
Solution Approach 2:
The patent changes the control parameters by introducing a speed threshold parameter and modifying the reference speed generation mechanism. Instead of allowing speed to naturally oscillate through zero, the system maintains speed above the threshold by adjusting the reference speed signal, thereby transforming the chaotic motion from bidirectional to unidirectional while preserving its chaotic characteristics
2Reliability
If tracking control method is used to achieve single direction chaotic speed, then bidirectional rotation is eliminated, but the speed reference change tracking is restricted by system response time
Solution Approach 1:
The patent applies dynamics by making the reference speed signal time-varying and adaptive. The reference speed is generated as a chaotic signal that continuously changes, allowing the system to track dynamic speed profiles while maintaining single-direction rotation. This dynamic approach overcomes the limitations of fixed threshold methods and improves speed response capability
Solution Approach 2:
The patent uses feedback by continuously monitoring the instantaneous motor speed and comparing it with the reference speed signal. The controller adjusts the control output based on the speed error, ensuring accurate tracking of the chaotic reference speed while maintaining speed above the threshold, thereby resolving the contradiction between stability and response capability
3Adaptability or versatility
If motor parameters are designed to generate chaotic rotation speed, then chaotic motion can be achieved, but the chaotic motion is not easily maneuvered and loses flexibility
Solution Approach 1:
The patent makes the system dynamic and adjustable by allowing the reference speed signal to be freely programmed. Different chaotic reference speed profiles can be generated by modifying the signal parameters, enabling easy maneuvering and adaptation to different application requirements without changing motor parameters, thus achieving both chaotic motion generation and operational flexibility
Data Source
AI summary
A method of realizing single direction chaotic rotation speed of permanent magnet synchronous motor is provided powered by a three-phase full-bridge inverter.