Motor Thermal Management via Segmented Cooling and Feedback Control
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Solution Overview
Problem
Heat dissipation in motors leads to reduced lifespan and performance, particularly in the stator, where existing cooling technologies are insufficient in managing the generated heat effectively.
Innovation Solution
A system and method for controlling a motor that estimates the temperature of the permanent magnet portion of the rotor using a thermal equivalent circuit, incorporating data from a data storage unit, temperature measuring unit, rotation speed, and driving electric current, to control the motor's driving electric current and prevent demagnetization by managing heat transfer through a cooling flow path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If water-cooling is used to cool the stator, then heat dissipation performance is improved, but the temperature of the permanent magnet portion cannot be controlled and demagnetization risk increases
Solution Approach 1:
The cooling system is segmented into two independent parts: a stator cooling flow path for cooling the stator, and a rotor cooling flow path for cooling the permanent magnet portion. This allows independent temperature control of each component, enabling effective stator heat dissipation while simultaneously preventing permanent magnet overheating and demagnetization
Solution Approach 2:
A temperature sensor is introduced as an intermediary device to detect the temperature of the permanent magnet portion. This temperature information is fed back to the controller, which then adjusts the driving electric current to prevent demagnetization, creating a closed-loop control system that protects the permanent magnet
2Power
If driving electric current is increased to improve motor performance, then power output is improved, but heat generation increases and lifespan is reduced
Solution Approach 1:
The system uses temperature sensors to continuously monitor temperatures of both the stator and permanent magnet portion. This temperature feedback is used by the controller to adjust the driving electric current in real-time, preventing excessive heat generation that would reduce motor lifespan while maintaining optimal power output
Solution Approach 2:
The driving electric current is made dynamic rather than fixed. The controller continuously adjusts the current based on real-time temperature conditions of the stator and permanent magnet, enabling the motor to operate at high power when cooling is effective and reduce current when temperatures approach dangerous levels, thereby extending lifespan
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
The solution effectively extends the motor's lifespan by preventing demagnetization and maintaining performance by accurately estimating and managing the temperature of the permanent magnet portion, thereby enhancing heat dissipation and reducing the risk of overheating.
Implementation Method 1
a cooling medium passes therethrough
Implementation Method 2
a cooling medium passes therethrough
Implementation Method 3
In the thermal equivalent circuit, thermal resistances may include resistances at the rotor, the stator core, the housing, and the cooling medium
Data Source
AI summary
Provided are a system for controlling a motor and a method thereof. The system includes: a data storage unit in which data relating to a thermal equivalent circuit of the motor is stored; a temperature measuring unit which measures a temperature of a cooling medium which enters a cooling flow path portion; a rotation speed measuring unit which measures a rotation speed of a rotor; a driving electric current measuring unit which measures a driving electric current of the motor; a permanent magnet temperature estimating unit which estimates a temperature of the permanent magnet portion of the rotor; and a driving controller controls driving of the motor.