Linear Compressor Motor Identification via Test Signal
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Solution Overview
Problem
Existing compressor control systems for linear compressors require inconvenient processes for measuring motor constants and are limited in compatibility, necessitating multiple control programs for different motor models, which complicates control and maintenance.
Innovation Solution
An apparatus and method that includes a driver, current detector, voltage detector, and controller to identify the motor type by applying a test signal and calculating motor constants, allowing for adaptive control signal generation based on the motor's characteristics without pre-defined programs, enabling efficient control and diagnosis of linear compressors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple control programs are built into the device for different motor models, then compatibility with various motor models is improved, but device complexity increases
Solution Approach 1:
The control device automatically identifies the motor model by measuring motor constants (resistance, inductance, counter electromotive force constant) and selects the appropriate control program without requiring manual configuration or pre-defined programming for each motor type. This self-identification capability eliminates the need for multiple pre-configured control programs while maintaining compatibility with various motor models.
Solution Approach 2:
The system measures and compares motor parameters (resistance, inductance, counter electromotive force constant) to identify the motor model. By changing from a fixed program selection approach to a dynamic parameter-based identification approach, the system achieves compatibility with multiple motor models without increasing device complexity.
2Measurement precision
If motor constants are measured and directly input to control program for each motor model, then control precision is improved, but ease of operation deteriorates
Solution Approach 1:
The control device automatically performs motor constant measurement and identification without requiring manual intervention. The system autonomously measures resistance, inductance, and counter electromotive force constant, compares them with stored data to identify the motor model, and selects the appropriate control program, eliminating the inconvenient manual process while maintaining precise control.
Solution Approach 2:
The system performs motor constant measurement and model identification as a preliminary automatic step before normal operation begins. This preliminary automated action ensures precise control parameters are established without requiring manual configuration during operation, improving both precision and ease of operation.
3Ease of manufacture
If a fixed control program is built into the device for a specific motor model, then ease of manufacture is improved, but adaptability deteriorates
Solution Approach 1:
Instead of manufacturing devices with pre-configured control programs for specific motor models, the system is manufactured with the capability to automatically identify motor models by measuring motor constants. This self-identification feature allows a single manufactured device to adapt to various motor models, maintaining ease of manufacture while significantly improving adaptability.
Solution Approach 2:
The control device is designed with universal functionality to work with multiple motor models through automatic model identification. By measuring motor constants and selecting appropriate control programs based on measured values, a single device design can control various motor types, eliminating the need for model-specific manufacturing while maintaining broad adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables autonomous identification of motor types and adaptive control, simplifying the control process, improving compatibility, and facilitating efficient operation and maintenance of various linear compressors with a single control program.
Implementation Method 1
measuring a motor current and a motor voltage based on the test signal; calculating a motor constant or constants of the motor, based on the measured motor current and motor voltage
Data Source
AI summary
An apparatus and method for controlling a linear compressor are provided. The apparatus and method may identify a kind of motor of a linear compressor, based on an output which may be measured by applying a test signal to the linear compressor, and may control the linear compressor depending on the identified kind of motor. The apparatus and method may diagnose whether the linear compressor has broken down, and thus, the kind of motor may be autonomously identified without a separate device or a measurement operation, control suitable for a characteristic or characteristics of the motor may be accurately and efficiently controlled, and maintenance, repair, and inspection of the linear compressor may be simply and easily performed.