Motor Coil Connection Switching for Compressor State-Adaptive Control
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Solution Overview
Problem
It is challenging to control a motor in a compressor based on its state, particularly in air conditioning systems, where the motor's rotation speed needs to be adjusted according to varying conditions such as temperature, to optimize efficiency and performance.
Innovation Solution
A driving device is introduced that includes an inverter, a connection switching device, a controller, and a compressor state detector. This setup allows the controller to switch the connection state of the motor's coils between Y and delta connections based on detection values and thresholds, enabling precise control of the motor's rotation speed according to the compressor's state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If motor control is based on rotation speed threshold, then motor operation efficiency is improved, but control accuracy according to compressor state deteriorates
Solution Approach 1:
The patent changes the control parameter from rotation speed alone to a combination of rotation speed and compressor state (temperature). The controller now uses both parameters to determine coil connection state, allowing the system to adapt to varying compressor conditions while maintaining efficient motor operation. This resolves the contradiction by incorporating temperature as an additional control dimension.
Solution Approach 2:
The patent introduces dynamic switching between Y-connection and delta-connection based on real-time compressor state detection. The connection state is no longer fixed or solely speed-dependent, but dynamically adjusted according to both rotation speed and temperature conditions, enabling precise control that adapts to changing operational requirements.
2Use of energy by moving object
If coil connection state is switched based on rotation speed, then motor efficiency is improved, but responsiveness to compressor state changes deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the compressor state detector continuously monitors temperature and feeds this information back to the controller. The controller then adjusts the coil connection state based on this feedback, creating a closed-loop control system that responds quickly to compressor state changes while maintaining motor efficiency.
Solution Approach 2:
The patent uses preliminary detection of compressor state (temperature) before making control decisions. By detecting temperature changes early and using this information proactively in conjunction with rotation speed, the system can anticipate and respond to compressor state changes more rapidly, improving responsiveness without sacrificing efficiency.
Data Source
AI summary
A driving device is used with a compressor including a motor including coils. The driving device drives the motor. The driving device includes an inverter connected to the coils, a connection switching unit to switch a connection state of the coils between a first connection state and a second connection state, a controller to control the inverter and the connection switching unit, and a compressor state detection unit to detect a state of the compressor. When the connection state of the coils is the first connection state, the controller controls the motor based on a first detection value detected by the compressor state detection unit and a first threshold. When the connection state of the coils is the second connection state, the controller controls the motor based on a second detection value detected by the compressor state detection unit and a second threshold.