Air Compressor Motor TN Characteristic Control
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Solution Overview
Problem
Motor-driven air compressors struggle to meet the high demand for compressed air required by tools like spray guns, as they have limited capacity and efficiency due to fixed motor characteristics, leading to uneven painting and increased downtime.
Innovation Solution
An air compressor system with a motor-driven compression mechanism, a tank for storing compressed air, and a control part that adjusts the motor's TN characteristic in response to load, allowing for increased rotation and discharge of compressed air by field weakening control, especially during low load conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large-type engine-driven air compressor is used to generate a large amount of compressed air, then the discharge amount of compressed air is sufficient, but the device becomes heavy and difficult to carry, and produces loud noise and gasoline smell
Solution Approach 1:
The patent replaces the engine-driven mechanical system with an electric motor system. The motor-driven compression mechanism eliminates the need for fuel combustion, thereby removing the gasoline smell and reducing noise while maintaining the capability to generate sufficient compressed air volume through electronic control of the motor's TN characteristic.
Solution Approach 2:
The patent changes the motor's TN characteristic parameter dynamically based on load conditions. By adjusting the motor control parameters in response to load acquisition, the system can vary the rotation speed and torque output to match demand, allowing a smaller motor to achieve the same effective discharge amount as a larger engine-driven system would provide under all conditions.
2Volume of moving object
If a motor-driven air compressor with fixed TN characteristic is used, then the device is smaller and easier to carry, but the discharge amount of compressed air is limited when high demand is required
Solution Approach 1:
The patent makes the motor's TN characteristic dynamic rather than fixed. The control part adjusts the motor control parameters in response to acquired load information, enabling the motor to adapt its rotation-speed-torque relationship to match varying compression demands. This allows a compact motor to deliver high discharge amounts when needed while maintaining small size.
3Reliability
If the motor characteristic is determined based on current value at high pressure, then the motor is efficient at high load, but it cannot respond quickly to low load conditions when tank pressure is low
Solution Approach 1:
The patent implements a feedback control mechanism where the control part continuously monitors the load acquisition data and adjusts the motor control parameters accordingly. This feedback loop enables the motor to respond dynamically to changing load conditions and tank pressure levels, optimizing the filling speed at each stage of the compression process rather than maintaining a fixed characteristic optimized only for high pressure.
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
This solution enhances the discharge capacity of compressed air, reducing filling time and maintaining efficient motor performance across varying load conditions, preventing air shortages and ensuring consistent tool operation.
Implementation Method 1
the control part is configured to perform control for changing a TN characteristic of the motor in response to the load of the compression mechanism
Data Source
AI summary
An air compressor includes: a motor; a compression mechanism that is driven by the motor and that is configured to generate compressed air; a tank that is configured to store the generated compressed air; a load acquisition part that is configured to acquire a load applied to the compression mechanism; and a control part that is configured to control a rotation of the motor. The control part is configured to perform control for changing a TN characteristic of the motor in response to the load of the compression mechanism acquired by the load acquisition part.