Rotor End Shield Feed Channels for Uniform Coolant Distribution
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Solution Overview
Problem
Existing rotary electric machines face challenges in effectively cooling the rotor and stator components, particularly due to inefficient distribution of coolant, leading to suboptimal cooling performance.
Innovation Solution
The implementation of a rotor end shield with feed channels that include a cross-sectional constriction and a coolant spraying portion, designed to regulate coolant flow and promote uniform distribution, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a constant cross-section feed channel is used, then the structure is simple, but the coolant distribution is uneven
Solution Approach 1:
The feed channel cross-sectional area is varied along its length, transitioning from a constant cross-section design to a variable cross-section design. The cross-sectional area decreases in the radial direction to create a constriction that regulates coolant flow rate, ensuring uniform distribution to all electrical conductors while maintaining manufacturing feasibility through controlled geometric parameter changes.
2Device complexity
If a single central coolant supply is used, then the device complexity is reduced, but the coolant distribution uniformity deteriorates
Solution Approach 1:
A single central coolant supply channel is maintained for simplicity, but the feed channels branching from it are designed with locally varied cross-sectional areas. Each feed channel has a constriction positioned at a specific location to regulate flow rate, creating local quality variations that ensure uniform coolant distribution to all electrical conductors despite the simple centralized supply structure.
3Temperature
If the coolant flow rate is increased, then the cooling performance is improved, but the pressure loss increases
Solution Approach 1:
The cross-sectional area of feed channels is optimized to maintain appropriate flow rates without excessive pressure loss. By carefully controlling the constriction geometry and position, the design achieves uniform coolant distribution and effective cooling performance while regulating pressure drop across the system, balancing cooling efficiency with pressure constraints.
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 design achieves improved cooling of electrical conductors by ensuring a regular distribution of coolant, even at low flow rates, thereby optimizing the thermal management of rotary electric machines.
Implementation Method 1
In the feed channel before the constriction, the pressure of the coolant is lower, which makes it possible to obtain a good distribution of the oil around the rotational axis of the rotor
Data Source
AI summary
The present invention relates to an end shield (10) for a rotary electric machine, including one or more feed channels (12) for feeding a coolant supplied from a channel formed in a rotor lamination stack (8) or in a shaft of the rotor (1) or between the rotor lamination stack and the shaft, wherein at least one feed channel (12) includes a cross-sectional constriction (15), the cross-section of the feed channel decreasing and then increasing in a radial direction relative to the rotational axis (X) of the machine.