Rotary Table Assembly With Compact Torque-Motor Drive
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Solution Overview
Problem
Machine tools of large dimensions, such as milling machines and gantry boring machines, face challenges in minimizing the size of accessory assemblies like motor assemblies for table rotation without compromising performance, especially when handling bulky and heavy semi-finished products.
Innovation Solution
A compact table assembly with a gearmotor-driven slide translation mechanism and torque motor-driven table rotation mechanism, utilizing epicyclic reduction gears and twin-drive configurations to minimize motor dimensions while maintaining performance, allowing for efficient translation and rotation of the table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional motor assemblies are used for table rotation, then sufficient torque and rotational performance are achieved, but the overall dimensions of the motor assembly become large and interfere with processing operations
Solution Approach 1:
The patent replaces a conventional motor assembly with a direct torque motor drive system. The torque motor integrates the motor function and transmission function into a single compact unit, eliminating the need for separate gears, belts, or other mechanical transmission components. This substitution of the mechanical transmission system with a direct-drive torque motor achieves significant space reduction while maintaining the required rotational torque for table movement
Solution Approach 2:
The torque motor serves multiple functions simultaneously: it provides both the rotational motion and the required torque multiplication that would traditionally require separate motor and gear assembly components. This multi-functionality allows the system to achieve both compact dimensions and sufficient driving power within a single integrated component
2Volume of moving object
If motor assembly dimensions are reduced, then interference with processing operations is minimized, but positioning precision and speed control may deteriorate
Solution Approach 1:
The patent replaces mechanical transmission components with a direct torque motor drive, eliminating mechanical play and transmission errors that compromise positioning precision. The direct-drive system provides more accurate position control by removing intermediate mechanical linkages that can introduce backlash and cumulative errors
Solution Approach 2:
The torque motor enables precise control of rotational parameters including speed, acceleration, and position through electronic control systems. This allows for high-precision positioning and smooth motion control without the dimensional constraints of conventional mechanical transmission systems
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
The solution effectively reduces the overall dimensions of the motor assembly required for table rotation, enabling seamless operation on large machine tools without interfering with the processing of heavy semi-finished products, while maintaining high-speed and precise positioning capabilities.
Implementation Method 1
utilizing epicyclic reduction gears and twin-drive configurations to minimize motor dimensions while maintaining performance
Data Source
AI summary
A table assembly for a machine tool is provided. The table assembly has a slide, a rotatable table and a table rotation mechanism placed on board the slide and adapted to be driven to rotate the table about a vertical axis. The table rotation mechanism has at least one rotation assembly engaged with a ring gear of the table. The at least one rotation assembly has a torque motor having a vertical motor axis and a reduction gear having an inlet engaged with the torque motor, and an outlet pinion engaged with the ring gear of the table, coaxial to the motor axis. The machine tool is a milling machine or a gantry boring machine.