Linear Motor Spline Groove Anti-Revolution Mechanism
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Solution Overview
Problem
Existing rod-type linear motors face issues with compact size and preventing rod revolution when the coils and housing are fixed, leading to potential rotary motion and limitations in stroke length.
Innovation Solution
The linear motor incorporates a rod with spline grooves on its outer surface and a housing with a rolling-element spline nut to prevent revolution, allowing the rod to move linearly while maintaining a compact size and reducing sliding resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a linear guide is arranged between the base and the rod to prevent revolution, then the rod can move linearly without revolving, but the size of the linear motor becomes larger
Solution Approach 1:
The spline grooves are formed directly on the outer circumferential surface of the rod, nesting the anti-revolution mechanism within the rod itself rather than adding external components. The revolution stopper on the shaft engages with these grooves, creating a compact integrated solution that prevents rod revolution without increasing overall motor size.
Solution Approach 2:
Instead of using a linear guide that extends the motor housing in one dimension, the invention uses spline grooves cut into the rod's surface and engages them with a revolution stopper on the drive shaft. This transfers the anti-revolution function to a different dimensional approach, maintaining compactness while achieving the same functional goal.
2Device complexity
If the rod is made to float in the coils with only axial thrust force, then the structure is simple, but the rod is forced to revolve when momentum gives rotary force
Solution Approach 1:
The spline grooves are pre-formed on the rod's outer surface before operation. When the rod is subjected to axial thrust from the coils, these pre-formed grooves immediately engage with the revolution stopper on the drive shaft, providing preliminary anti-action against any revolutionary forces that may arise from momentum or external disturbances.
Solution Approach 2:
The spline grooves create an asymmetric engagement pattern between the rod and the revolution stopper. This asymmetric geometry provides mechanical interference that specifically resists rotational motion while allowing axial movement, creating a simple yet effective anti-revolution mechanism without complex symmetric structures.
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 effectively limits rod revolution, maintains a compact size, and enhances magnetic field strength by avoiding spline grooves on the magnet shaft, allowing for stable linear movement and improved detection of speed and travel distance.
Implementation Method 1
a rod equipped with magnets, coils surrounding the rod, and a housing covering the coils, the rod being made to linearly move relatively to the coils by magnetic fields from the magnets and current made to flow through the coils
Data Source
AI summary
A compact linear motor is provided which is able to limit a rod, which linearly moves relatively to coils, from revolving.The linear motor comprises a rod (11) equipped with magnets (13), coils (4) surrounding the rod (11), and a housing (5) covering the coils (4), and the rod (11) is made to linearly move relatively to the coils (4) by magnetic fields from the magnets (13) and current made to flow through the coils (4). And the rod (11) comprises an outer circumferential surface on which spline grooves (10a) are formed so as to run along an axial direction of the rod (11). The housing (5) comprises a spline nut (8) that fits the spline grooves (10a) and limits the rod (11) from revolving around an axis line thereof.