Sealed Ball-Circulation Linear Motor for Dust-Stable Accuracy
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Solution Overview
Problem
Conventional ball linear motors suffer from decreased operating accuracy and stability due to processing accuracy and installation deviations of multiple ball cages, leading to reduced performance.
Innovation Solution
A linear motor design featuring a stator slide rail, rotor, sealing module, ball return end cap, lubrication module, and ball retaining plate with a locating surface and contact surfaces to form circulating loops for ball movement, ensuring sealing and lubrication within a sealed space to improve accuracy and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple ball cages are installed to maintain contact between balls and track, then stroke accuracy and stability performance are maintained, but processing accuracy and installation deviation of ball cages decrease operating accuracy
Solution Approach 1:
The patent removes the ball cages from the system entirely, extracting the problematic component that caused accuracy degradation. Instead of using multiple ball cages to maintain ball contact, the invention uses a different structural approach where balls are contained within a sealed space formed by the rotor, stator slide rail, and sealing module, eliminating the need for ball cages while maintaining proper ball track contact
Solution Approach 2:
The patent merges the functions of multiple ball cages into a single sealed space configuration. By creating a sealed environment where balls circulate between the rotor and stator slide rail without requiring separate ball cage structures, the invention combines what would have been multiple discrete components into an integrated system, thereby eliminating cumulative installation deviations
2Reliability
If multiple ball cages are installed to maintain contact between balls and track, then stroke accuracy and stability performance are maintained, but the number of ball cages increases device complexity and installation deviation
Solution Approach 1:
The patent extracts and removes the ball cages from the system, eliminating the complexity associated with installing and aligning multiple separate components. The sealed space design replaces the need for multiple ball cage structures with a simpler integrated configuration
Solution Approach 2:
The invention merges the functions of multiple ball cages into a unified sealed space system. Instead of having separate ball cage components that must be individually installed and aligned, the patent creates an integrated sealed environment that accomplishes the same ball retention and guidance function with fewer parts
3Reliability
If ball cages are used to maintain ball contact, then operating stability is maintained, but external dust can enter and affect operating accuracy
Solution Approach 1:
The patent converts the potential harm of dust entry into a benefit by implementing a sealed space configuration. The sealing module creates a protected environment that prevents dust and contaminants from entering the ball circulation path, while the sealed space itself becomes a feature that enhances operating stability by isolating the balls from external contaminants
Data Source
AI summary
The present invention relates to a linear motor, the rotor is well sealed through a sealing module when running on the stator slide rail, so that small external dust that affects the operating accuracy and stability performance of linear motor is not easy to enter the sealed space; the lubrication module communicates with the sealed space, so that the linear motor can be effectively lubricated during operation, further improving the operational accuracy and stability of the linear motor; the ball return end cap and the first chute together form a circulation loop for ball movement, the ball retaining plate fits with rotor through locating surface to improve the installation accuracy, meanwhile contact surfaces that limit balls are provided on both sides of the locating surface, so that a ball retaining plate can be used for two rows of circulation loops.