Linear Motor Iron Core Groove for Coil Lead Routing
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Solution Overview
Problem
Existing linear motors for portable consumer electronic products require additional space for coil leads to connect with external circuits, reducing the magnetic gap utilization and increasing magnetic circuit losses.
Innovation Solution
The linear motor design incorporates an iron core with inwardly recessed grooves for coil leads to connect directly to a circuit board, avoiding the magnetic gap and enhancing space utilization, with symmetric grooves to reduce magnetic circuit losses and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coil leads pass through the magnetic gap to connect to external circuits, then electrical connection is achieved, but magnetic gap space increases and magnetic circuit utilization rate decreases
Solution Approach 1:
The iron core serves as an intermediary structure with grooves that provide a dedicated pathway for coil leads. This mediator allows electrical connection without requiring the leads to pass through the magnetic gap, thus resolving the contradiction between achieving reliable electrical connection and maintaining compact magnetic gap space.
Solution Approach 2:
Instead of allowing coil leads to extend in the radial direction through the magnetic gap, the invention routes them through grooves in the iron core, changing the dimensional path from radial to axial/directional along the core surface. This dimensional change eliminates the need for additional magnetic gap space while maintaining electrical connectivity.
2Ease of operation
If coil leads pass through the magnetic gap, then electrical connection is established, but magnetic circuit losses increase
Solution Approach 1:
The iron core with integrated grooves acts as an intermediary that guides coil leads away from the magnetic gap region. This eliminates the harmful effect of leads disrupting magnetic flux paths, thereby reducing magnetic circuit losses while still achieving easy electrical connection to external circuits.
Solution Approach 2:
The invention extracts the coil leads from the magnetic gap region by routing them through grooves in the iron core. This separation removes the source of magnetic circuit losses caused by leads passing through the gap, while electrical connection functionality is preserved through the groove pathways.
3Reliability
If symmetric grooves are provided on the iron core, then magnetic circuit losses are reduced and reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The iron core is segmented with multiple grooves distributed symmetrically on its surface. This segmentation allows coil leads to be routed through specific grooves, ensuring balanced magnetic circuit performance and reduced losses. The segmented groove structure achieves reliability improvement while maintaining manufacturability through standard machining processes.
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 reduces the magnetic gap space, enhances magnetic circuit efficiency, and increases the reliability of the linear motor by allowing direct coil lead connection to the circuit board, optimizing space utilization and performance.
Implementation Method 1
The first coil and the second coil are respectively provided at two sides of the yoke... The first coil and the second coil are inserted into the magnetic gap
Implementation Method 2
A magnetic gap is formed between the iron core and the magnet... The vibrator includes a magnet spaced apart from the stator
Data Source
AI summary
Provided is a linear motor, including a housing having a receiving space; a vibrator and a stator received therein; an elastic member suspending the vibrator in the housing; and a circuit board. The housing includes a bottom cover and a shell covering the bottom cover and enclosing the receiving space together with the bottom cover. The stator includes an iron core fixed in the housing, a yoke sleeved on the iron core, and first and second coils provided on two sides of the yoke. The second coil is provided between the yoke and the bottom cover. The circuit board is fixed to the bottom cover. The vibrator includes a magnet spaced apart from the stator. The iron core is provided with a groove formed by recessing inwardly from a surface thereof. A coil lead of the first coil passes through the groove to be electrically connected to the circuit board.