Motor Shaft Neutralizing Seal Layout Against Oil Contamination
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Solution Overview
Problem
Conventional neutralizing devices for eliminating static electricity from motor shafts in drive devices face efficiency decreases and electrical connection defects due to foreign matter adherence, such as lubricating oil and refrigerant, which can reduce conductivity and cause defects in electrical connections.
Innovation Solution
The drive device incorporates a shaft, rotor, stator, bearing, housing, and a first neutralizing device, with a seal member between the bearing and the neutralizing device, and a second neutralizing device between the third motor bearing and the first neutralizing device, to enhance electrical connectivity and prevent foreign matter from affecting the neutralizing device's efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a neutralizing device contacts the shaft to ground shaft voltage, then static electricity elimination efficiency is improved, but foreign matter adherence reduces conductivity and causes electrical connection defects
Solution Approach 1:
A seal member is introduced as an intermediary component between the bearing and the neutralizing device. This seal member prevents foreign matter (lubricating oil, refrigerant) from adhering to the neutralizing device while allowing the neutralizing device to maintain electrical connection with the shaft. The seal member acts as a barrier that protects the neutralizing device from harmful substances without interfering with its electrical grounding function.
Solution Approach 2:
The drive device is segmented into distinct functional zones: a bearing accommodation space for the bearing, and a neutralizing device accommodation space for the neutralizing device, separated by the seal member. This segmentation isolates the neutralizing device from the bearing environment where foreign matter accumulates, allowing each component to operate in its optimal condition without mutual interference.
2Reliability
If lubricating oil and refrigerant adhere to the neutralizing device, then conductivity decreases, but eliminating static electricity becomes less efficient
Solution Approach 1:
The seal member serves as a protective intermediary that blocks foreign matter (lubricating oil and refrigerant) from reaching the neutralizing device. By positioning the seal member between the bearing accommodation space and the neutralizing device accommodation space, it prevents the accumulation of conductive foreign matter on the neutralizing device surface, thereby maintaining its electrical conductivity and static electricity elimination efficiency.
3Reliability
If the neutralizing device is exposed to the bearing environment, then electrical connection defects occur, but isolation increases device complexity
Solution Approach 1:
The seal member provides a simple yet effective barrier between the bearing environment and the neutralizing device. This single intermediary component prevents electrical connection defects caused by foreign matter adherence without requiring complex isolation structures or multiple protective mechanisms, thus maintaining structural simplicity while ensuring electrical connection stability.
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 improves the efficiency of static electricity elimination by maintaining the conductivity of the neutralizing device and preventing defects in electrical connections, thus enhancing the overall performance of the drive device.
Implementation Method 1
The first neutralizing device is arranged on one axial side of the bearing, and electrically connects the shaft and the housing
Implementation Method 2
The seal member is arranged between the bearing and the first neutralizing device in the axial direction
Data Source
AI summary
A drive device includes a shaft, a rotor, a stator, a bearing, a housing, a first neutralizing device, and a seal member. The shaft extends in the axial direction along a rotation axis. The rotor is fixed to the shaft and is rotatable about the rotation axis. The stator faces the rotor with a gap therebetween in the radial direction. The bearing rotatably supports the shaft. The housing accommodates the rotor, the stator, and the bearing. The first neutralizing device is arranged on one axial side of the bearing and electrically connects the shaft and the housing. The seal member is arranged between the bearing and the first neutralizing device in the axial direction.