Linear Drive Arrangement Reducing Moment Loads
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Solution Overview
Problem
Existing machine tools with linear drives face high moment loads and require large guide systems due to the side-by-side arrangement of linear motors, leading to increased mass and reduced precision in movement.
Innovation Solution
A linear drive configuration with two drive units, each having a primary and secondary part, where the movement unit is centrally arranged between the drive units, minimizing the need for one drive unit to carry the other and reducing moment loads on guide systems, allowing for compact and precise movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If two linear motors are arranged side-by-side to drive movement in two axis directions, then the functional unit can be moved in a movement plane, but the drive units must carry each other resulting in high moment loads and large guide systems
Solution Approach 1:
The patent transitions from a side-by-side arrangement (same dimension) to a face-to-face arrangement where drive units are positioned on opposite sides of the movement unit, utilizing spatial dimensionality to redistribute forces and reduce moment loads on guide systems
2Adaptability or versatility
If drive units are arranged side-by-side, then both axis movements are achieved, but the masses to be accelerated are increased due to carrying requirements
Solution Approach 1:
By repositioning drive units from a side-by-side configuration to opposite sides of the movement unit, the patent reduces the carrying mass requirements while maintaining two-axis movement capability
3Strength
If drive units are positioned to carry each other, then structural support is provided, but the guide systems require large dimensions to handle the loads
Solution Approach 1:
The patent uses spatial repositioning of drive units to opposite sides of the movement unit, which redistributes structural support functions and reduces guide system dimensions by minimizing moment loads
4Adaptability or versatility
If side-by-side arrangement is used, then both drive units can operate independently, but transverse forces are not compensated resulting in guide system loads
Solution Approach 1:
The patent positions drive units on opposite sides of the movement unit, creating a counterbalancing arrangement where transverse forces from one drive unit are compensated by the other, reducing guide system loads
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 configuration reduces the masses to be accelerated, minimizes moment loads, and allows for compact and precise movements, enabling the use of smaller drive and guide devices while maintaining high operational capabilities.
Implementation Method 1
The two linear motors each comprise a primary part with an exciter coil and a secondary part with permanent magnets
Data Source
AI summary
A machine tool is provided that has a linear drive by means of which a movement unit connected in motion with a functional unit is movable in two axis directions of a movement plane. The linear drive includes two drive units. The primary parts or the secondary parts of the two drive units are attached to the movement unit. The primary part or the secondary part of the one drive unit is disposed in that case on that side of the movement unit which, perpendicularly to the movement plane of the movement unit, is opposite the side of the movement unit provided with the primary part or the secondary part of the other drive unit.