EV Motor Cooling Control After Neutral Point Charging
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Solution Overview
Problem
The temperature of the electric motor rises during neutral point charging, necessitating effective cooling strategies based on the likelihood of immediate use after charging.
Innovation Solution
An electric vehicle system that includes a cooler activated by a controller when the motor is likely to be used immediately after neutral point charging, with temperature-based activation and selective cooling modes to conserve energy when immediate use is unlikely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooler is activated to cool the electric motor after neutral point charging, then the motor temperature is reduced, but energy is consumed unnecessarily when the motor is not immediately used
Solution Approach 1:
The controller determines in advance whether the electric motor is likely to be used immediately after neutral point charging based on the main switch state. If the main switch is on, the cooler is activated in advance to cool the motor before use. If the main switch is off, the cooler is not activated, avoiding unnecessary energy consumption. This preliminary determination of cooling need resolves the contradiction between temperature control and energy efficiency.
2Use of energy by moving object
If the cooler is not activated when the motor temperature is high, then energy is conserved, but the motor may overheat when it needs to be used immediately
Solution Approach 1:
The controller continuously monitors the state of the main switch to determine whether the electric motor is likely to be used immediately after neutral point charging. This feedback mechanism enables the controller to make informed decisions about cooler activation: when the main switch is on (indicating imminent use), the cooler is activated to ensure motor reliability; when the main switch is off (indicating no immediate use), the cooler is not activated to conserve energy. This feedback-based control resolves the contradiction between energy conservation and operational reliability.
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
Effectively cools the electric motor and inverter when needed, conserving energy by avoiding unnecessary cooling when immediate use is unlikely, thus protecting the motor and inverter from overheating.
Implementation Method 1
a cooler configured to cool the electric motor
Implementation Method 2
the controller has boosted electric power supplied through the charging terminal with the stator coils and the inverter and charged the battery
Data Source
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AI summary
The present teachings provide an electric vehicle (100) configured to cool an electric motor (110) when it is likely that the electric motor is to be used immediately after neutral point charging. The electric vehicle may include: an electric motor (110) configured to drive an axle; an inverter (120) including a DC terminal connected to a battery (109) and AC terminals connected to stator coils (111) of the electric motor; a charging terminal (103) connected to a neutral point of the stator coils; a cooler (130) configured to cool the electric motor; and a controller (101). The controller may activate the cooler when a main switch (102) for activating the electric motor is on and a temperature of the motor exceeds a threshold temperature after the controller has boosted electric power supplied through the charging terminal with the stator coils and the inverter and charged the battery.