Eccentric Bearing Adjustment for Uniform Motor Air Gaps
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Solution Overview
Problem
Existing electric motors lack a mechanism to adjust the air gap between the stator and rotor uniformly, leading to increased noise and vibration due to non-uniform gaps, which cannot be adjusted in the assembled state.
Innovation Solution
An air gap adjustment apparatus that allows for adjusting the relative position of the rotor with respect to the stator by using a movable bearing supported by an end plate, facilitated by an eccentric adjusting member that rotates to adjust the bearing's position, thereby uniforming the air gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the air gap between stator and rotor is made small to improve motor efficiency, then the noise and vibration of the motor increase
Solution Approach 1:
The bearing is designed to be movable with respect to the end plate, allowing dynamic adjustment of the rotor position and air gap size. This enables optimization of motor efficiency while maintaining acceptable noise and vibration levels through adjustable clearance.
2Object-generated harmful factors
If the air gap between stator and rotor is made large to reduce noise and vibration, then the motor efficiency decreases
Solution Approach 1:
The movable bearing allows the air gap to be adjusted dynamically, enabling the system to achieve larger gaps for reduced noise and vibration while maintaining efficiency through optimized positioning.
3Device complexity
If the bearing is fixedly installed to simplify the structure, then the air gap cannot be adjusted in the assembled state
Solution Approach 1:
The bearing is designed with movability relative to the end plate, enabling air gap adjustment after assembly while maintaining relatively simple structural implementation through the adjustable mounting mechanism.
4Adaptability or versatility
If the bearing is made movable to enable air gap adjustment, then the structure becomes more complex
Solution Approach 1:
The bearing is designed to be movable with respect to the end plate through a relatively simple adjustable mounting mechanism, enabling air gap adjustment without excessive structural complexity.
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 apparatus minimizes motor vibration and noise by enabling uniform adjustment of the air gap between the stator and rotor, ensuring consistent performance.
Implementation Method 1
an eccentric adjusting member (36) that rotates to adjust the position of the bearing (30) with respect to the end plate (16)
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Proposed is an air gap adjustment apparatus. The apparatus is for enabling an air gap between the inner surface of a stator (22) and the outer surface of a rotor (24), which are installed in an inner space (14) of a housing (10), to be uniform overall. A plurality of fastening holes (19) are formed so as to surround a shaft through hole (18) of an end plate (16) constituting the housing (10). A fastener (28), which has passed through a bearing housing (32) of a bearing (30), is fastened to each fastening hole (19) so as to mount the bearing (30) to the end plate (16). An adjusting member body (37) of an adjusting member (36), which has passed through the bearing housing (32), is positioned in an adjusting member seating part (20) which is formed at the entrance of each fastening hole (19). The adjusting member (36) rotates about the adjusting member body (37) so that a head part (38) may adjust the position of the bearing (30).