Wheel Brake Actuator Liquid Cooling for Low-Speed Motor Heat
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Solution Overview
Problem
Existing air cooling systems for electro-mechanic wheel brake actuators are inefficient at low speeds due to low air velocities and high bulk air temperatures, leading to insufficient heat removal and reduced wear-resistance of electrical components.
Innovation Solution
A cooling system utilizing a liquid or gaseous coolant with a cooling jacket and channels to enhance heat dissipation, combined with a controller for temperature regulation, ensuring efficient cooling even at low speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If air cooling system is used for the electric motor, then the cooling system is simple in structure, but the cooling efficiency is insufficient at low speeds due to low air velocities and high bulk air temperatures
Solution Approach 1:
The patent transitions from air cooling to liquid cooling by introducing a cooling circuit with coolant channels. The cooling circuit includes inlet and outlet ports for coolant flow, and channels formed in the stator and/or rotor to enable efficient heat transfer from the electric motor components to the circulating coolant, thereby resolving the insufficient cooling efficiency at low speeds.
Solution Approach 2:
The patent changes the cooling medium from gas (air) to liquid (coolant), fundamentally altering the heat transfer parameters. The liquid coolant provides superior heat capacity and thermal conductivity compared to air, enabling effective cooling even when vehicle speed and air flow are low.
2Ease of manufacture
If air cooling is used, then the system requires no additional cooling fluid infrastructure, but heat removal is significantly limited due to low convection coefficient at low speeds
Solution Approach 1:
The patent implements a hydraulic cooling system with a cooling circuit that circulates liquid coolant through channels in the electric motor. This system actively manages heat removal by pumping coolant through the stator and rotor, ensuring consistent heat dissipation regardless of vehicle speed or air convection conditions.
3Device complexity
If conventional air cooling is used, then the cooling system has low component count, but the wear-resistance of electrical motors decreases due to high temperatures
Solution Approach 1:
The patent introduces a liquid coolant circulation system with cooling channels integrated into the stator and rotor. This hydraulic cooling approach maintains lower operating temperatures of the electric motor components, thereby preserving wear-resistance and extending component life, especially during low-speed operation when air cooling is ineffective.
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
Improves cooling efficiency and wear-resistance of wheel brake actuators by effectively managing heat dissipation through controlled fluid flow, particularly at low speeds.
Implementation Method 1
the efficiency of the air cooling systems for the wheel brake actuators is limited by the air convection which depends directly on the air circulation
Implementation Method 2
a cooling system for a cooling fluid to cool one or more parts of the electric motor
Implementation Method 3
the cooling system comprises a cooling layer which is arranged on one or more parts of the electric motor to cool down the electric motor due to evaporating of the cooling fluid supplied to the cooling layer
Data Source
Figure 1~2
Figure 3~4
AI summary
The present invention relates to an electric motor for actuating a wheel brake actuator, the electric motor including a stator and a rotor, wherein the electric motor further comprises a cooling system for a liquid coolant to cool one or more parts of the electric motor. The present invention further relates to a wheel brake actuator comprising an electric motor and method of controlling of a cooling system of an electric motor for actuating a wheel brake actuator.