Air Conditioner Motor Connection Switching Unit Abnormality Detection
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Solution Overview
Problem
Existing air conditioner systems fail to detect abnormalities in the connection switching unit, leading to potential system malfunctions and secondary failures.
Innovation Solution
Incorporating a control unit that detects abnormalities in the connection switching unit by comparing current values when the system is set in different connection states, allowing for early detection and notification of issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a connection switching unit is used to switch connection states of motor coils, then motor efficiency is improved and high output is achieved, but the risk of abnormal connection and system malfunction increases
Solution Approach 1:
The control unit performs preliminary abnormality detection on the connection switching unit before the motor starts operating. By detecting abnormalities in advance through current value comparisons during preliminary Y-connection and Δ-connection states, the system prevents malfunctions before they occur, ensuring both high power output and system reliability
2Measurement precision
If existing abnormality diagnosis methods are used to detect winding short circuits, then winding abnormalities are detected, but connection switching unit abnormalities cannot be detected
Solution Approach 1:
The abnormality detection process is segmented into distinct phases: first detecting winding abnormalities through existing methods, then separately detecting connection switching unit abnormalities by comparing current values between Y-connection and Δ-connection states. This segmentation allows both types of abnormalities to be detected independently without interference
Solution Approach 2:
The control unit acts as an intermediary that coordinates multiple detection methods. It first uses existing current detection circuits to detect winding abnormalities, then introduces a new detection method using current value comparisons during switching operations to detect connection switching unit abnormalities, combining both detection capabilities
3Use of energy by moving object
If connection states are switched between Y-connection and Δ-connection, then motor efficiency under intermediate conditions is improved, but the complexity of the driving system increases
Solution Approach 1:
The control unit performs multiple functions: it controls the connection switching unit to switch between Y-connection and Δ-connection states for efficiency optimization, performs preliminary abnormality detection before motor operation, and compares current values to detect connection abnormalities. This multi-functionality reduces the need for separate dedicated components, managing system complexity while maintaining efficiency benefits
Data Source
AI summary
An air conditioner includes a compressor to compress a refrigerant used in a refrigeration cycle, a converter to generate a DC voltage, an inverter to generate three-phase AC voltages from the DC voltage, a motor to produce a driving force for driving the compressor with a plurality of coils, the three-phase AC voltages being applied to the coils, a connection switching unit to switch connection states of the coils between a first connection state and a second connection state, and a controller to detect an abnormality of the connection switching unit.