Motor Cooling Pipe Flow Control for Accurate Stator Coil Spray

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Solution Overview

Problem

Existing electric motor cooling systems fail to maintain proper coolant ejection onto the stator coil due to changes in vehicle acceleration, leading to inefficient cooling.

Innovation Solution

An electric motor cooling apparatus with a cooling pipe oriented vertically and ejection apertures that adjust ejection direction based on vehicle acceleration, regulated by a coolant flowrate system using acceleration information from sensors.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a cooling pipe with ejection apertures is arranged vertically above the electric motor, then coolant can be ejected toward the stator coil, but the ejection direction changes when vehicle acceleration varies, causing coolant to miss the proper cooling site

Engineering Contradiction:

Improvecooling pipe arrangementVSAvoidcoolant ejection accuracy

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The ejection aperture is designed to change its ejection direction dynamically based on coolant flow rate. When vehicle acceleration changes, the coolant flow rate adjusts, which automatically changes the ejection direction to compensate for the acceleration-induced deviation, keeping the coolant directed at the proper cooling site on the stator coil

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system changes the ejection direction parameter by varying the coolant flow rate. The ejection aperture responds to different flow rates by altering its ejection angle, allowing the system to adapt to different vehicle acceleration conditions and maintain accurate coolant delivery to the stator coil

Inventive Principle:

Principle #35Parameter changes

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

Ensures consistent coolant ejection onto the stator coil, optimizing cooling efficiency despite vehicle behavior changes.

Implementation Method 1

a cooling pipe disposed above the electric motor in direction of a vertical line in on-vehicle state, the cooling pipe having an ejection aperture from which the coolant is ejected

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

an acceleration information acquisition part detecting or estimating acceleration information of the vehicle

Methodology Applied

Scientific EffectAcceleration detection: Accelerometer

Implementation Method 3

enabling coolant to be poured over the optimum range for cooling on the stator coil

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentUS12445016B2Electric motor cooling apparatus

Publication Date: 2025.10.14 TOYOTA JIDOSHA KK

AI summary

An electric motor cooling apparatus applied to an electric motor mounted as a driving force source on a vehicle. The electric motor has a stator core and a stator coil wound around the stator core, the electric motor cooling apparatus ejects coolant toward the stator coil. The electric motor cooling apparatus comprises a cooling pipe disposed above the electric motor in direction of a vertical line in on-vehicle state. The cooling pipe has an ejection aperture from which the coolant is ejected. The electric motor cooling apparatus comprises an acceleration information acquisition part detecting or estimating acceleration information of the vehicle and a coolant flowrate regulation part regulating flowrate of the coolant supplied into the cooling pipe. The ejection aperture of the cooling pipe is formed to enable adjustment of ejection direction of the coolant ejected from the ejection aperture, depending on the flowrate of the coolant.