Method and apparatus for controlling permanent magnet synchronous motor of an air conditioning device
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Solution Overview
Problem
The existing sensor-less vector control method for permanent magnet synchronous motors in air conditioning devices is inefficient due to offline estimation of motor parameters, leading to significant errors under varying temperature and frequency conditions, which can cause reduced energy efficiency, increased noise, and potential motor shutdown.
Innovation Solution
The air conditioning device continuously estimates the rotor position angle error and adjusts motor parameters based on real-time current and rotation speed feedback, using a motor information collection module and a motor control module to update stator resistance and magnetic flux values, ensuring accurate control and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If offline motor parameters are used for control, then the control system is simple and easy to implement, but the position estimation error becomes large under extreme temperature and low frequency conditions, reducing motor energy efficiency and increasing noise
Solution Approach 1:
The patent transitions from static offline parameters to dynamic real-time parameter estimation. The control system continuously estimates rotor position angle error and updates motor parameters (stator resistance, magnetic flux) during operation, allowing the system to adapt to changing temperature and frequency conditions while maintaining position estimation accuracy
Solution Approach 2:
The patent implements a feedback mechanism where the rotor position angle error is continuously estimated based on sampled current and rotation speed, and this error information is fed back to adjust the motor parameters. This closed-loop approach ensures that parameter estimation accuracy is maintained under varying operating conditions without significantly increasing system complexity
2Ease of manufacture
If offline motor parameters are used for control, then the initial setup is simple, but the motor operation energy efficiency is reduced and noise increases under varying operating conditions
Solution Approach 1:
The system maintains ease of initial setup while improving energy efficiency through dynamic parameter adaptation. The control system automatically estimates and updates motor parameters during operation, ensuring optimal energy efficiency across varying temperature and frequency conditions without complicating the initial manufacturing or setup process
Solution Approach 2:
The motor control system performs self-adjustment by automatically estimating its own parameter changes during operation. The system monitors current and speed, estimates rotor position angle error, and updates its own motor parameters without external intervention, maintaining energy efficiency while keeping the system simple to manufacture and deploy
3Ease of operation
If offline motor parameters are used for control, then the control method is simple to implement, but the motor may stop abnormally under bad working conditions
Solution Approach 1:
The patent enhances reliability while maintaining operational simplicity by implementing dynamic parameter estimation. The system continuously adapts motor parameters to actual operating conditions, preventing abnormal shutdowns caused by parameter mismatches under extreme temperature or low frequency conditions, all through an automated process that does not complicate operation
Solution Approach 2:
The feedback mechanism continuously monitors motor operation through sampled current and speed data, estimates rotor position angle error, and adjusts parameters in real-time. This closed-loop control prevents abnormal shutdowns by maintaining accurate parameter estimation under varying conditions, while the automated nature of the process keeps the system simple to operate
Data Source
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AI summary
The invention discloses an air conditioning device and a method and apparatus for controlling a permanent magnet synchronous motor thereof, the device comprising: a parameter storage module that stores initial motor parameters; a main control module for transmitting a motor operation instruction and the initial motor parameters acquired from the parameter storage module; a permanent magnet synchronous motor control means for controlling a motor to start operating based on the initial motor parameters after receiving the motor operation instruction; then estimating a rotor position angle error based on the sampled and collected current and rotation speed of the motor; estimating current motor parameters based on the estimated rotor position angle error; and controlling the operation of the motor based on the estimated current motor parameters. The rotor position angle error is estimated based on the feedback current and rotation speed of the motor to thereby estimate the motor parameters, and the estimated motor parameters are used to control the operation of the motor so as to reduce the rotor position angle error, thereby also improve the motor energy efficiency and reduce noises.