Linear Motor Runner with Oscillating Field for Thread Guide
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Solution Overview
Problem
Existing thread guide devices for winding units using electric linear motors face limitations in achieving high speeds and accelerations due to the need to accelerate and move large masses, leading to premature wear and downtime from excessive magnetic forces on the bearing.
Innovation Solution
The solution involves a thread guide designed as a runner of an electric linear motor with a pendulum field superimposed on a traveling field, using sliding surfaces with asymmetrical permanent magnets and oscillating field windings to minimize friction and distribute magnetic forces, allowing for higher speeds and accelerations while reducing wear on the bearing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the runner mass is increased to improve bearing stability, then the bearing can handle magnetic forces better, but the acceleration and speed of the thread guide decrease
Solution Approach 1:
The patent applies the dynamics principle by making the runner mass variable through the addition and removal of magnet sets. The runner can be configured with different numbers of permanent magnets depending on the operational requirements - more magnets for stability-critical operations, fewer magnets for speed-critical operations. This dynamic reconfiguration allows the system to adapt its mass characteristics to match the specific task at hand, resolving the contradiction between bearing stability and acceleration capability.
2Reliability
If the runner mass is increased to improve bearing stability, then the bearing can handle magnetic forces better, but the acceleration and speed of the thread guide decrease
Solution Approach 1:
The patent applies the dynamics principle by making the runner mass variable through the addition and removal of magnet sets. The runner can be configured with different numbers of permanent magnets depending on the operational requirements - more magnets for stability-critical operations, fewer magnets for speed-critical operations. This dynamic reconfiguration allows the system to adapt its mass characteristics to match the specific task at hand, resolving the contradiction between bearing stability and acceleration capability.
3Productivity
If magnetic forces are increased to improve thread guide performance, then the thread guide can operate more effectively, but the bearing experiences excessive forces leading to premature wear
Solution Approach 1:
The patent applies the parameter changes principle by enabling dynamic adjustment of the magnetic field strength through variable magnet configurations. The control unit can modify the number of active permanent magnets in the runner, thereby changing the magnetic interaction parameters between the runner and stator. This allows optimization of thread guide performance for each specific task while preventing excessive magnetic forces that would damage the bearing, thus resolving the contradiction between performance and bearing service life.
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 design enables significantly higher speeds and accelerations with reduced friction losses and extended service life by minimizing the mass of the runner and distributing magnetic forces, thus overcoming the limitations of existing thread guide devices.
Implementation Method 1
at least one of the two stator parts being provided for generating a traveling magnetic field, and with the rotor having at least one permanent magnet so that the runner can move back and forth in the traveling field along the stator parts
Implementation Method 2
the rotor also being provided with sliding surfaces with which it can slide on the sliding surfaces of the stator. Two variants of the invention that are not specifically described, but which can be easily understood from the description, dispense with the pendulum field in the first additional variant, and with the sliding surfaces in the second additional variant.
Data Source
Figure 1~2
Figure 3~4
Figure 5~5a
AI summary
The invention relates to a linear motor having a rotor (1), which rotor (1) is displaceably mounted between a first stator part (2) and a second stator part (3) which is arranged opposite said first stator part, of a stator (4), wherein at least one of the two stator parts (2, 3) is intended to generate a magnetic travelling field, and wherein the rotor (1) comprises at least one permanent magnet (5) or at least one non-return element, so that the rotor (1) can move to and fro along the stator parts (2, 3) in the travelling field, wherein means (6; 2, 3) for generating a magnetic oscillating field are provided, said oscillating field generating a magnetic force on the at least one permanent magnet (5) or on the at least one non-return element of the rotor (1) in a direction (y) normal to the direction (x) of the to and fro movement in such a way that the rotor (1) executes an oscillating movement between the two stator parts (2, 3) during its movement along the stator (4). As an alternative or preferably in addition, provision may be made for at least one sliding surface (7, 8) to be provided in the region of the two stator parts (2, 3), it being possible for at least one sliding surface (7, 8) of the rotor (1) to slide along said sliding surface as the rotor moves to and fro.