Driving device, air conditioner, and method for driving motor
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Solution Overview
Problem
Existing motor driving systems for air conditioners face difficulties in quickly responding to rapid load changes due to the need for continuous measurement and comparison of rotation speed against thresholds, which hinders efficient operation during low-speed and high-speed rotations.
Innovation Solution
A driving device that includes a connection switching unit, a temperature sensor, and a controller to switch the connection state of the motor coils based on detected room temperature, allowing for rapid adaptation to load changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotation speed is continuously measured and compared to threshold for a certain time period, then switching between Y connection and delta connection can be performed, but the system cannot quickly respond to rapid load change
Solution Approach 1:
The patent replaces the mechanical measurement system (rotation speed sensing and continuous monitoring) with a thermal field-based control system. Instead of measuring rotation speed mechanically or electronically over time, the system uses temperature detection to infer load conditions and trigger connection switching. This substitution eliminates the time delay inherent in continuous measurement systems while maintaining reliable switching decisions based on actual load conditions.
Solution Approach 2:
The patent changes the control parameter from rotation speed (which requires continuous monitoring over time) to temperature (which provides immediate load information). By detecting temperature changes that correlate with load variations, the system can instantly determine when switching between Y and delta connections is appropriate, achieving both reliability and rapid response without the need for time-based threshold comparisons.
2Use of energy by moving object
If connection state switching is based on rotation speed threshold comparison over time period, then operation efficiency during low-speed and high-speed rotation is improved, but device complexity increases due to continuous measurement requirements
Solution Approach 1:
The patent extracts the essential information needed for connection switching (load condition) from the complex continuous rotation speed measurement system and represents it through a simpler temperature parameter. By taking out only the critical load indication through temperature detection, the system maintains operational efficiency benefits while eliminating the complexity of continuous speed monitoring, threshold comparison logic, and time-period tracking mechanisms.
Solution Approach 2:
The system uses the temperature field, which naturally responds to load changes, as a self-indicating parameter. The temperature detection automatically provides load information without requiring active measurement, processing, or comparison operations. This self-service approach to load sensing simplifies the control system while maintaining the ability to optimize operation efficiency through appropriate connection switching.
Data Source
AI summary
A driving device drives a motor having coils. The driving device includes a connection switching unit to switch a connection state of the coils, a temperature sensor to detect a room temperature, and a controller to switch the connection state of the coils based on a detected temperature by the temperature sensor.