Roundness Measuring Machine Motor Control
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Solution Overview
Problem
Roundness measuring machines face inefficiencies due to fixed, long acceleration and deceleration times set for workpieces with large inertia moments, leading to prolonged measurement times and reduced processing efficiency, while attempting to balance accuracy and motor operation stability.
Innovation Solution
A roundness measuring machine with a control device that includes a starting current detector and an acceleration/deceleration time setting unit, which adjusts acceleration and deceleration times based on the detected starting current of the motor, allowing for shorter times as the inertia moment decreases, ensuring accurate measurements without excessive mechanical load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sufficiently long acceleration time is set for workpieces with large inertia moments, then measurement accuracy and motor operation stability are ensured, but measurement efficiency and processing productivity are reduced
Solution Approach 1:
The patent applies dynamics by making the acceleration time variable rather than fixed. The control device dynamically adjusts the acceleration time based on the detected inertia moment of each workpiece, allowing the system to adapt its operation parameters to match the specific characteristics of each workpiece being measured.
Solution Approach 2:
The patent changes the parameter of acceleration time based on the inertia moment of the workpiece. The control device detects the inertia moment and automatically adjusts the acceleration time parameter, transforming it from a fixed value to a variable that adapts to different workpiece characteristics.
2Productivity
If the acceleration time is shortened for workpieces with small inertia moments, then measurement efficiency is improved, but measurement accuracy may be compromised due to insufficient acceleration
Solution Approach 1:
The patent uses feedback by detecting the inertia moment of the workpiece and using this information to adjust the acceleration time. The control device receives feedback about the workpiece characteristics and automatically modifies the acceleration parameters to ensure both accuracy and efficiency.
3Speed
If a powerful driving mechanism is used to accelerate workpieces with large inertia moments quickly, then acceleration time is reduced, but mechanical load on the measuring device increases and excess equipment is required
Solution Approach 1:
The patent changes the operational parameters (acceleration time) based on the workpiece inertia moment rather than increasing the driving mechanism power. This allows efficient acceleration of heavy workpieces without requiring excessive mechanical capability or increasing device complexity.
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 optimized acceleration and deceleration times tailored to each workpiece's inertia moment, reducing overall measurement time and enhancing processing efficiency while maintaining measurement accuracy.
Implementation Method 1
a starting current detector configured to detect a starting current of the motor
Implementation Method 2
a motor configured to rotate the table
Implementation Method 3
a brake is applied to the table with the workpiece being rotated
Data Source
AI summary
A roundness measuring machine includes: a base; a table rotatable relative to the base; a probe configured to scan a surface of a workpiece mounted on the table; a motor configured to rotate the table; and a control device configured to control a rotation of the motor. The control device includes: a starting current detector configured to detect a starting current of the motor; and an acceleration/deceleration time setting unit configured to detect at least one of acceleration time and deceleration time for the motor in accordance with the starting current. The roundness measuring machine can suitably set the acceleration time and the deceleration time for the motor corresponding to the inertia moment of the workpiece mounted on the table.