Linear Motor Stator Circuit Board Insulation Thickness Reduction
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Solution Overview
Problem
Conventional linear motors face insulation issues when the coil is fixed to a metal part, leading to reduced space utilization due to the need for insulation between the coil and the magnetic conductive sheet, which occupies additional space in the Z-direction.
Innovation Solution
The design incorporates a first and second stator with circuit boards and magnetic conductive sheets of varying thicknesses, where the magnetic conductive sheets and circuit boards are attached to the coil and housing, and include avoidance slots for the coil leads, reducing the overall thickness and volume of the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If FPC is used to isolate the coil from the magnetic conductive sheet, then insulation is improved, but space utilization in the Z direction deteriorates
Solution Approach 1:
The patent extracts the insulation function from a separate FPC layer and integrates it into the circuit board structure itself. The circuit board's bottom surface directly contacts the magnetic conductive sheet, eliminating the need for additional insulation layers while maintaining electrical isolation through the circuit board's own insulating properties.
Solution Approach 2:
The patent merges the structural support function and insulation function into a single integrated circuit board component. The circuit board simultaneously provides mechanical support for the coil and electrical insulation from the magnetic conductive sheet, eliminating the need for separate FPC insulation layers and reducing overall Z-direction thickness.
2Stability of the object's composition
If the coil is fixed to a metal part, then structural stability is improved, but insulation problems with the shell occur
Solution Approach 1:
The patent introduces the circuit board as an intermediary component between the coil and the magnetic conductive sheet. This intermediary provides both mechanical fixation for the coil and electrical insulation, preventing direct contact between conductive elements while maintaining structural stability.
Solution Approach 2:
The circuit board utilizes composite material properties combining mechanical strength for structural support with electrical insulation properties. This allows the coil to be firmly fixed while preventing electrical short circuits with the magnetic conductive sheet and housing.
3Reliability
If insulation layers are added between the coil and magnetic conductive sheet, then insulation is improved, but the motor thickness increases
Solution Approach 1:
The circuit board is designed to perform multiple functions simultaneously: providing mechanical support for the coil, ensuring electrical insulation from the magnetic conductive sheet, and serving as a structural element of the stator. This multi-functionality eliminates the need for separate insulation layers, reducing overall motor thickness.
Solution Approach 2:
The patent utilizes the thin film nature of the circuit board to provide insulation without adding significant thickness. The circuit board's thin insulating structure is sufficient to prevent electrical breakdown while maintaining a compact motor profile.
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 enhances space utilization in the thickness direction, reduces the motor's volume, and improves structural stability and magnetic induction, allowing for more efficient vibration feedback.
Implementation Method 1
The first stator includes a first circuit board opposite to the vibrator, a first coil on a the side of the first circuit board close to the vibrator
Implementation Method 2
a magnet and a weight, and the vibrator and stator are connected by a V-shaped spring. The magnet is arranged in the middle of the upper and lower stator
Implementation Method 3
a first magnetic conductive sheet locating on a side of the first circuit board away from the vibrator
Implementation Method 4
a spring bracket supporting the vibrator in the accommodation space
Data Source
AI summary
The present disclosure provides a linear motor having a housing with an accommodation space; a vibrator accommodated in the accommodation space; and a first stator locating opposite to the vibrator and fixed to the housing. The first stator includes a first circuit board opposite to the vibrator, a first coil on a the side of the first circuit board close to the vibrator, and a first magnetic conductive sheet locating on a side of the first circuit board away from the vibrator. The linear motor further has a spring bracket supporting the vibrator in the accommodation space. The present invention is to provide a linear motor which improves the space utilization of the linear motor in a thickness direction.