Air conditioner, and method and device for controlling its compressor to stop
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Solution Overview
Problem
Inverter air conditioners face high vibration and stress on piping when the compressor is stopped directly at high frequency, leading to potential piping damage, as existing methods to reduce frequency do not adequately mitigate these issues.
Innovation Solution
A method and device that acquire the rotor phase corresponding to the minimum load of the compressor during shutdown, determining if the current rotor phase matches this minimum load phase to control the compressor's shutdown, thereby reducing vibration and stress on the piping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the compressor is stopped directly at high frequency, then the shutdown time is short and productivity is improved, but the vibration and stress on piping increases causing potential damage
Solution Approach 1:
The system performs preliminary detection of rotor phase before shutdown, and preliminarily adjusts the shutdown timing to coincide with the minimum load phase. This preliminary action ensures that the compressor stops at the optimal moment, reducing vibration and stress on piping while maintaining short shutdown time.
Solution Approach 2:
The system changes the timing parameter of shutdown by detecting rotor phase and selecting the minimum load phase as the shutdown moment. This parameter change optimizes the shutdown conditions, reducing harmful vibrations and stresses on piping while maintaining efficient operation.
2Object-affected harmful factors
If the frequency is reduced to control the compressor to stop, then the vibration and stress on piping is reduced, but the shutdown time increases and productivity decreases
Solution Approach 1:
The system performs preliminary detection of rotor phase before shutdown, and preliminarily determines the optimal shutdown moment at minimum load phase. This eliminates the need for frequency reduction, achieving both vibration reduction and maintained productivity.
Solution Approach 2:
The system changes from frequency-based control to phase-based timing control. By detecting rotor phase and shutting down at minimum load phase, the system achieves vibration reduction without extending shutdown time, thus maintaining productivity.
3Object-affected harmful factors
If the compressor is stopped at minimum load phase, then the vibration and stress on piping is minimized, but additional detection and control complexity is introduced
Solution Approach 1:
The system uses the compressor's own rotor phase information, which is already available from the control system, to determine the optimal shutdown moment. This self-service approach minimizes additional detection requirements and keeps the control system relatively simple while achieving vibration reduction.
Data Source
AI summary
A method and a device for controlling a compressor to stop are disclosed in the present disclosure. The method includes: acquiring a rotor phase corresponding to a minimum load of the compressor; during a shutdown process of the air conditioner, acquiring a current orientation of the rotor of the compressor and determining whether a phase of the rotor is the rotor phase corresponding to the minimum load according to the current orientation of the rotor; and controlling the compressor to stop if determining that the phase of the rotor is the rotor phase corresponding to the minimum load. Therefore, a generated vibration and stress of a piping is smaller than that generated by directly stopping the compressor, to effectively reduce the vibration and stress of the piping at the moment that the compressor is stopped and to avoid a danger of breaking the piping.