Linear Motor Needle Deceleration Position Control
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Solution Overview
Problem
The existing part mounting devices face inefficiencies in reducing the time required to mount electronic components on a printed circuit board due to suboptimal speed change positions, leading to wasted time in picking up and placing components.
Innovation Solution
A linear motor device with a controller that calculates and sets a deceleration start position based on the distance required to reduce speed from a first to a second speed, ensuring the pressurizing target is engaged with a predetermined pressure, thereby optimizing the speed change process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the arm moves at high speed until immediately before contact with the electronic part, then the mounting time is reduced, but the position where speed is changed must be set according to electronic part height which leads to wasted time
Solution Approach 1:
The system performs preliminary measurement of the electronic part height before mounting, uses this information to calculate and set the optimal speed change position in advance, thereby eliminating wasted time during the actual mounting operation. The deceleration start position is predetermined based on measured part characteristics.
Solution Approach 2:
The system measures the actual height of the electronic part and uses this feedback information to adjust the speed change position dynamically. This closed-loop control ensures the arm always decelerates at the optimal position regardless of variations in electronic part height, minimizing pressurization time.
2Ease of operation
If the speed change position is set based on user judgment, then the system is easy to operate, but the optimum position may not be set leading to time waste
Solution Approach 1:
The system automatically measures electronic part height and calculates the optimal speed change position without requiring user intervention. The controller autonomously determines the deceleration start position based on measured dimensions, eliminating both manual setup time and suboptimal positioning that would occur with user judgment.
Solution Approach 2:
The patent replaces manual user judgment with an automated measurement and calculation system. Optical or sensor-based measurement replaces the mechanical act of user observation and estimation, while computational algorithms replace user decision-making in determining the optimal speed change position.
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 allows for precise determination of the deceleration start position, reducing the time needed to pressurize the target and enhancing the efficiency of the mounting process by minimizing unnecessary speed changes.
Implementation Method 1
a linear motor device including a linear motor and a controller that applies pressure to a pressurizing target by moving a needle provided in the linear motor
Data Source
AI summary
A linear motor device includes a linear motor and a controller that applies pressure to a pressurizing target by moving a needle provided with the linear motor. The controller includes: a speed-change position-setting unit that calculates a deceleration start position, which is a position where a movement speed of the needle starts to be reduced from a first speed to a second speed when the pressurizing target start to be pressurized, based on a distance required to reduce the movement speed of the needle from the first speed to the second speed which is lower than the first speed and at which pressure applied to the pressurizing target when the needle comes into contact with the pressurizing target is equal to or lower than a predetermined pressure; and a position determination unit that drives the needle of the linear motor at the first speed and at the second speed.