Drum Motor Drive Unit Liquid Encapsulation Sealing
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Solution Overview
Problem
Drum motors used in conveyor systems, particularly in the foodstuff industry, face challenges in reducing contamination risks while maintaining hygiene standards under high-pressure washing conditions, and require compact and economical designs to prevent oil leakage and ensure food safety.
Innovation Solution
An electric drive unit for drum motors featuring a stator and rotor housed in a cylindrical stator housing with a liquid encapsulation on the cable, creating a fluid-tight barrier to prevent oil leakage, and a rear flange with an annular space for the encapsulation, allowing for a compact and reliable construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a compact drum motor design is used, then the construction length is reduced and space is saved, but the risk of contamination increases and hygiene requirements become harder to meet
Solution Approach 1:
The cable is nested within the drum motor housing, with the liquid encapsulation integrated into the cable structure. The encapsulation is disposed within the drum motor's internal space, effectively nesting the sealing solution within the compact design without increasing external dimensions.
Solution Approach 2:
The liquid encapsulation acts as an intermediary barrier between the drive device interior and the external environment. This encapsulation layer prevents direct contact between oil and the external environment, thereby reducing contamination risk while maintaining the compact drum motor design.
2Ease of manufacture
If traditional cable connections are used, then the drive device can be assembled, but oil leakage occurs and contamination risk increases
Solution Approach 1:
The liquid encapsulation forms a flexible sealing barrier around the cable. This encapsulated cable maintains flexibility for electrical connections while preventing oil leakage, as the liquid encapsulation creates a fluid-tight barrier that adapts to the cable's movements.
Solution Approach 2:
The solution combines the cable structure with the liquid encapsulation material to create a composite sealing system. This composite structure integrates the electrical connection function with the sealing function, preventing oil leakage while maintaining assembly capability.
3Ease of operation
If the liquid encapsulation is disposed outside the drum motor, then cable access is easier, but the construction becomes less compact and reliability decreases
Solution Approach 1:
The cable access problem is solved by transitioning from an external cable routing approach to an internal routing approach. The cable is guided through the rear flange into the interior of the drum motor, utilizing the internal space dimensionally to maintain sealing integrity while providing adequate access points.
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 solution effectively prevents oil leakage and contamination, ensuring the reliability and safety of drum motors in food processing environments while maintaining a compact design, thus addressing the challenges of contamination and hygiene in the foodstuff industry.
Implementation Method 1
a liquid encapsulation disposed on a second portion of the cable that has individual lines which are litz wires; wherein a rear flange which at an end side that faces away from an interior of the stator housing has an annular space disposed on one end of the stator housing; and wherein the liquid encapsulation is disposed in the annular space
Data Source
AI summary
An electric drive unit comprises an electric drive device having a stator and a rotor, the stator and the rotor being disposed in a stator housing which extends along a longitudinal axis, a cable, wherein a first portion of the cable is connected to the drive device, and a liquid encapsulation is disposed on a second portion of the cable which has individual lines which are litz wires. A rear flange at an end side that faces away from an interior of the stator housing and has an annular space disposed on one end of the stator housing, wherein the liquid encapsulation is disposed in the annular space.