Permanent Magnet Linear Motor Air Gap Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing permanent magnet linear motors have an incomplete magnetic circuit due to large air gaps between iron cores and permanent magnets, leading to low motor power and efficiency.
Innovation Solution
A permanent magnet linear motor design that narrows the air gap between the stator core and the permanent magnet by embedding the magnet in a supporter and using a multitooth stator core with coil winding, forming a complete magnetic circuit for enhanced power and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inner and outer iron cores are used to solve the overall magnetic circuit, then the motor structure is complete, but the air gap between iron core and permanent magnet enlarges, resulting in large volume and low efficiency
Solution Approach 1:
The patent removes the outer iron core from the motor structure, retaining only the necessary inner iron core. This extraction eliminates the space-consuming outer core while preserving the essential magnetic circuit function through alternative magnetic path design, directly resolving the contradiction between magnetic circuit completeness and motor volume.
Solution Approach 2:
The patent changes the magnetic circuit configuration from a traditional radial path requiring both inner and outer iron cores to a design where the magnetic flux operates primarily within the inner core and permanent magnet assembly. This dimensional reconfiguration reduces the radial space required while maintaining magnetic circuit effectiveness.
2Reliability
If inner and outer iron cores are used to solve the overall magnetic circuit, then the motor structure is complete, but the air gap between iron cores enlarges, resulting in low magnetic and electromagnetic force utilization
Solution Approach 1:
By removing the outer iron core that created excessive air gaps, the patent eliminates the source of magnetic force loss. The simplified structure with only the inner iron core reduces air gap length, thereby improving magnetic coupling and electromagnetic force generation efficiency.
Solution Approach 2:
The patent changes the magnetic circuit parameters by eliminating the outer core, which directly reduces the air gap length and improves magnetic permeability. This parameter change enhances the utilization of magnetic and electromagnetic forces without compromising the essential magnetic circuit function.
3Device complexity
If traditional permanent magnet linear motor design is used, then the structure is simple, but the air gap is large and motor power is insufficient
Solution Approach 1:
The patent changes critical geometric parameters including reducing the air gap length and optimizing the permanent magnet dimensions and arrangement. These parameter changes significantly increase the electromagnetic force generation capability and motor power output while maintaining structural simplicity through the elimination of the outer iron core.
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
The design results in a compact, high-power, low-consumption motor with improved efficiency by utilizing the electromagnetic energy effectively and allowing for uniform magnetic force distribution.
Implementation Method 1
Coil winding of the permanent magnet linear motor generates electromagnetic force after being energized, cooperating with magnetic force of permanent magnet to drive a shaft of motor to reciprocate linearly
Implementation Method 2
Coil winding of the permanent magnet linear motor generates electromagnetic force after being energized, cooperating with magnetic force of permanent magnet to drive a shaft of motor to reciprocate linearly
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Disclosed are a permanent magnet linear motor and a linear vibrator, the linear vibrator includes the permanent magnet linear motor, the permanent magnet linear motor includes a stator component, a rotor component and a motor housing (6), the stator component and the rotor component are both mounted in the motor housing (6), the rotor component includes a shaft (1), a supporter (9), and a permanent magnet (2), the supporter (9) is fixedly defined at the middle part of the shaft (1), the permanent magnet (2) is fixedly embedded in the supporter (9); the stator component includes a stator core (4), a frame (11), and a coil winding (8), the stator core (4) is fixedly defined in the motor housing (6), the frame (11) is formed by defining tooth structure on the stator core (4) along a radial direction, the coil winding (8) is coiled on the frame (11). The permanent magnet linear motor and a linear vibrator of the present disclosure can effectively narrow the air gap between the stator core and the permanent magnet, and that between one stator core and the other stator cores by adopting the permanent magnet as a magnetic source, to form a complete magnetic circuit by fully using of the electromagnetic energy, so as to improve the effective power and working efficiency of the motor.