Electric Machine Resolver Pressure Equalization
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Solution Overview
Problem
Existing electric machine arrangements face challenges in pressure equalization, leading to potential moisture ingress due to multiple interfaces with the surroundings, which can compromise the internal integrity of the assembly.
Innovation Solution
The introduction of pressure equalizing elements between the resolver space and adjacent machine spaces within the housing, rather than between the resolver space and the surroundings, reduces external interfaces and directs excess pressure equalization internally, with additional elements positioned above a collection section for leakage fluid to prevent contamination of the machine spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure equalizing elements are provided on the lateral surface of the housing to vent the resolver space to the surroundings, then pressure equalization is achieved, but the number of interfaces with the surroundings increases, leading to higher risk of moisture ingress
Solution Approach 1:
The machine space acts as an intermediary between the resolver space and the surroundings. Instead of directly venting the resolver space to the surroundings, pressure equalization is achieved through the machine space, which serves as a buffer zone. This reduces the number of direct interfaces with the surroundings and minimizes moisture ingress risk.
Solution Approach 2:
The pressure equalizing element is extracted from the lateral surface of the housing and relocated to the partition wall separating the resolver space from the machine space. This repositioning removes the direct interface between the resolver space and the pressure equalizing element, thereby reducing exposure to harmful external factors.
2Reliability
If multiple pressure equalizing elements are provided on the housing, then pressure equalization is improved, but the complexity of the housing structure increases
Solution Approach 1:
The pressure equalization function is merged into the partition wall structure that already separates the resolver space from the machine space. By integrating the pressure equalizing element into the existing partition wall, the housing structure complexity is minimized while still achieving effective pressure equalization.
3Reliability
If pressure equalizing elements are positioned on the lateral surface of the housing, then pressure venting to surroundings is achieved, but leakage fluid can potentially enter the machine spaces
Solution Approach 1:
The partition wall containing the pressure equalizing element serves as an intermediary barrier. It allows pressure equalization between the resolver space and machine space while preventing leakage fluid from the resolver space from directly entering the machine space, thus protecting against contamination.
Solution Approach 2:
The housing is segmented into distinct functional zones: the resolver space, the machine space, and the partition wall containing the pressure equalizing element. This segmentation allows independent management of each zone, enabling pressure equalization while maintaining protection against fluid contamination.
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 minimizes the risk of moisture ingress and ensures effective pressure equalization while preventing leakage fluid from entering the active rotor-stator assembly spaces, enhancing the reliability and durability of the electric machine arrangement.
Implementation Method 1
a pressure equalizing element, in order to enable a pressure equalization between the interior of the housing and the surroundings
Implementation Method 2
a collection section for leakage water that is provided in the resolver space, in which any leakage fluid, usually a coolant liquid
Data Source
AI summary
An electric machine arrangement, with two electric machines, each with a housing, wherein each housing has a machine space with a rotor-stator assembly and a resolver space section forming part of a resolver space that is formed between the machine spaces and is sealed off from the machine spaces. The housings are interconnected with their resolver space sections adjoining each other and complementing each other to form the resolver space. Several pressure equalizing elements are provided, and between the resolver space and at least one of the adjoining machine spaces, a pressure equalizing element is arranged, so that the pressure equalization occurs between the resolver space and the coupled machine space.