Solenoid Magnetizing Voltage for Needle Textile Machines
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Solution Overview
Problem
Traditional magnetizing methods in knitting machines require longer times to reach the preset magnetic field intensity, leading to increased magnetizing time and energy consumption.
Innovation Solution
Applying a preset magnetizing voltage that is at least 1.5 times the product of the DC resistance and peak magnetizing current of the solenoid, allowing for faster magnetization of the magnetic field reversible permanent magnet and reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional magnetizing voltage (equal to product of DC resistance and peak magnetizing current) is applied to the solenoid, then the solenoid can be operated safely within electrical limits, but the magnetizing time is long (1ms-2ms)
Solution Approach 1:
The patent changes the voltage parameter by applying a preset magnetizing voltage that is 1.5 to 5 times higher than the traditional magnetizing voltage (product of DC resistance and peak magnetizing current). This parameter change enables the magnetic field reversible permanent magnet to reach the preset magnetic field intensity much faster, reducing magnetizing time from 1-2ms to 0.2-0.5ms, while the high voltage is applied only briefly during the magnetizing pulse
Solution Approach 2:
The patent applies a high-voltage magnetizing pulse in advance to rapidly magnetize the magnetic field reversible permanent magnet before the actual knitting operation begins. This preliminary high-voltage action ensures the magnet is fully magnetized and ready for immediate needle selection, eliminating the need for prolonged magnetizing voltage during operation
2Use of energy by moving object
If traditional magnetizing voltage is applied to the solenoid, then energy consumption is reduced during normal operation, but the magnetizing time increases to 1ms-2ms
Solution Approach 1:
The patent applies a preset magnetizing voltage that is 1.5 to 5 times higher than the traditional magnetizing voltage (product of DC resistance and peak magnetizing current). This parameter change enables the magnetic field reversible permanent magnet to reach the preset magnetic field intensity much faster, reducing magnetizing time from 1-2ms to 0.2-0.5ms, while the high voltage is applied only briefly during the magnetizing pulse
Solution Approach 2:
The patent uses periodic pulsed voltage application where a high-voltage magnetizing pulse is applied briefly to rapidly magnetize the permanent magnet, followed by normal operation voltage. This periodic action pattern allows fast magnetizing during the pulse while maintaining energy efficiency during the off-state and normal operation
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 approach significantly shortens the magnetizing time and reduces energy consumption, enabling quicker coupling of the tool bit with the permanent magnet while maintaining efficient magnetic field intensity.
Implementation Method 1
After the solenoid is powered on, a magnetic field is formed in the solenoid to magnetize the magnetic field reversible permanent magnet
Implementation Method 2
The magnetic field reversible permanent magnet produces acting force with the permanent magnet at one end of the solenoid under the action of the preset residual magnetism to couple the tool bit on the permanent magnet
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to a magnetizing method and its apparatus in the needle textile field, which can shorten the magnetizing time of the solenoid. The magnetizing method includes: apply a preset magnetizing voltage to the solenoid of a preset turn number, the preset magnetizing voltage is more than or equal to 1.5 times of the product of the DC resistance of the solenoid and the peak magnetizing current of the solenoid; magnetize the magnetic field reversible permanent magnet in the solenoid at the preset magnetizing voltage by adopting the solenoid. The magnetizing apparatus includes: a voltage supply module for applying the preset magnetizing voltage to the solenoid of the preset turn number, the preset magnetizing voltage is more than or equal to 1.5 times of the product of the DC resistance of the solenoid and the peak magnetizing current of the solenoid; a magnetizing module for magnetizing the magnetic field reversible permanent magnet in the solenoid at the preset magnetizing voltage by adopting the solenoid.