Rotating Oil Distribution for Electrical Machine Cooling
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Solution Overview
Problem
Existing electrical machine configurations face challenges in increasing power density due to limitations in cooling systems, particularly in efficiently providing liquid cooling to rotor and stator windings.
Innovation Solution
The implementation of a liquid cooling system within the electrical machine, featuring cooling passages in the rotor and stator windings, along with a rotating oil distribution member and stationary oil delivery nozzle, which directs and pressurizes oil to effectively cool the rotor and stator windings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If liquid cooling system is implemented in electrical machine, then heat removal efficiency is improved, but device complexity increases
Solution Approach 1:
The cooling passages are nested within the rotor and stator windings structures. The rotor cooling passages are formed within the rotor body itself, and the stator cooling passages are integrated into the stator windings, allowing the cooling system to be embedded within the existing machine components rather than added as separate external systems.
Solution Approach 2:
The patent implements a liquid cooling system using oil as the coolant medium. The oil is circulated through the cooling passages in the rotor and stator windings, utilizing hydraulic principles to transfer heat efficiently from the windings to the coolant, thereby improving heat removal capability.
2Power
If cooling passages are added to rotor and stator windings, then power density is improved, but manufacturing complexity increases
Solution Approach 1:
The cooling passages are formed within the rotor and stator structures during the manufacturing process itself, before the windings are installed. The rotor cooling passages are created in the rotor body, and the stator cooling passages are formed in the stator core, allowing subsequent winding installation without additional complex assembly steps.
3Temperature
If oil distribution member and delivery nozzle are implemented, then cooling efficiency is improved, but device complexity increases
Solution Approach 1:
The oil distribution member is designed to distribute the coolant oil evenly to all cooling passages in the rotor and stator windings. The delivery nozzle is positioned to direct oil flow uniformly across the distribution member surface, ensuring equipotential distribution of the coolant to all cooling channels, thereby maximizing cooling efficiency without requiring complex control systems.
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 enhances the power density of electrical machines by efficiently removing heat from the rotor and stator windings through the use of liquid cooling, improving operational performance.
Implementation Method 1
liquid cooling system within the electrical machine, featuring cooling passages in the rotor and stator windings
Implementation Method 2
efficiently removing heat from the rotor and stator windings through the use of liquid cooling
Data Source
AI summary
An electrical machine includes a stator including a plurality of stator windings; and a rotor in magnetic cooperation with the stator. The rotor includes a plurality of cooling passages extending therethrough, each cooling passage including an inlet for receiving oil and an outlet for discharging the oil. The electrical machine includes a rotating oil distribution member coupled to the rotor, the oil distribution member including a radially inward portion and a radially outward portion, the radially outward portion being disposed adjacent to the inlets of the plurality of cooling passages. A stationary oil delivery nozzle is constructed to discharge oil toward the radially inward portion of the oil distribution member. The oil distribution member is constructed to receive the oil discharged by the oil delivery nozzle, and to direct the oil to the inlets of the cooling passages to cool the rotor.