Motor Spindle Floating Bearing for Precise Rotor Replacement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing motor spindles face challenges in achieving high-precision and reproducible replacement of the rotor, with potential damage to bearings due to contact and unintentional removal during operation, especially under thermal expansion differences between the stator and rotor.
Innovation Solution
The design incorporates a second rotary bearing with an axial floating bearing that compensates for thermal expansions, maintaining a consistent air gap along the adjustment path to prevent contact and includes a locking mechanism with adjustable bolts for secure attachment, ensuring reliable radial and axial locking of the rotor to the stator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the second pivot bearing is designed as an axial loose bearing to compensate for thermal expansion, then thermal expansion compensation is improved, but the risk of bearing damage due to contact or unintentional removal increases
Solution Approach 1:
The patent applies preliminary anti-action by pre-defining a limited adjustment path for the second coupling part that prevents it from moving into positions where contact with the inner ring would occur. The bearing gap is designed with predetermined boundaries that stop the floating bearing from displacing too far, thereby preventing bearing damage before it can happen during thermal expansion cycles
Solution Approach 2:
The patent implements dynamics by allowing the second coupling part to move axially within a defined adjustment path to accommodate thermal expansion differences between stator and rotor. The floating bearing design enables dynamic adaptation to temperature changes while the limited adjustment path ensures this movement remains within safe boundaries that prevent bearing damage
2Adaptability or versatility
If the second coupling part is made axially movable to compensate for thermal expansion, then thermal adaptation is improved, but the risk of accidental bearing removal during rotor replacement increases
Solution Approach 1:
The patent prevents accidental bearing removal by pre-establishing a limited adjustment path that restricts the axial movement of the second coupling part. The bearing gap is designed with predetermined boundaries that prevent the floating bearing from displacing far enough to be accidentally removed during rotor replacement operations, while still allowing sufficient movement for thermal expansion compensation
3Manufacturing precision
If the bearing gap is reduced to improve precision, then manufacturing precision is improved, but the risk of contact between bearing components increases
Solution Approach 1:
The patent resolves the precision-contact contradiction by implementing a dynamic floating bearing design where the second coupling part can move axially within a limited adjustment path. This dynamic capability allows the bearing to maintain optimal gaps under normal operating conditions for high precision, while automatically adjusting during thermal expansion to prevent contact damage
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 solution ensures high-precision and reproducible rotor replacement, prevents damage to bearings, and compensates for thermal expansions, maintaining operational stability and reliability.
Implementation Method 1
heat influences occurring during operation of the motor spindle, which can lead to different expansions of the stator and the rotor, can be compensated for by a displacement in the second pivot bearing
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
Motor spindle (1) with a sleeve-shaped stator (2) having a first coupling receptacle (11) and a second coupling receptacle (12), with a rotor (4) having a first coupling part (41) with axial fixed bearing and a second coupling part (42) with axial floating bearing, which are designed for fixing to the respective coupling receptacle (12), wherein the axial floating bearing comprises an inner ring (62) fixed on the rotor shaft (5) and an outer ring (63) arranged coaxially to the inner ring (62) and fixed to the second coupling part (42),wherein the second coupling part (42) is axially movable on the rotor shaft (5) parallel to the rotor axis (6) between a first functional position and a second functional position along an adjustment path (14) and wherein a first distance (58) exists between a first axial surface (66) of the inner ring (62) and the second coupling part (42) for the entire adjustment path (14) and a second distance (59) exists between a second axial surface (67) of the inner ring (62) and the second coupling part (42).