Coreless Motor Refrigerant Cooling for Overload Operation
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Solution Overview
Problem
Coreless electric motors face challenges in maintaining the temperature of their armature coils within a certain range when operating under overload conditions, leading to heat generation issues that can result in burnout and performance fluctuations.
Innovation Solution
A coreless rotating electrical machine design that includes a stator with a lid-type mount and a rotor with a cylindrical or cup-type mount, equipped with a refrigerant liquid supply system to vaporize the refrigerant and cool the cylindrical coil using latent heat, allowing for continuous operation under rated and overloaded conditions by adjusting the refrigerant supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the coreless motor operates under overload conditions, then the output power increases, but the coil temperature exceeds the allowable maximum temperature
Solution Approach 1:
The patent utilizes the phase transition of refrigerant liquid to vapor to absorb heat from the coil. The refrigerant absorbs latent heat during vaporization, effectively cooling the coil even under overload conditions. This is achieved by supplying refrigerant liquid to the air space where it vaporizes and absorbs heat from the cylindrical coil, maintaining temperature within allowable limits while enabling continuous overload operation.
2Temperature
If refrigerant liquid is supplied to cool the coil, then the temperature control improves, but the device complexity increases
Solution Approach 1:
The refrigerant liquid supply system is designed to automatically regulate cooling based on coil temperature conditions. The system utilizes the natural vaporization process of the refrigerant to absorb heat, requiring minimal external control mechanisms. The refrigerant self-regulates its cooling effect through phase change, reducing the need for complex active temperature control systems while maintaining effective cooling under various operating conditions.
3Productivity
If the motor operates continuously under overload, then the productivity increases, but the reliability decreases due to coil burnout risk
Solution Approach 1:
The patent implements preliminary cooling action by supplying refrigerant liquid to the air space before the coil temperature reaches critical levels. This preventive cooling measures ensures that the coil temperature remains below the allowable maximum temperature even during continuous overload operation, preventing coil burnout and extending motor reliability while maintaining high productivity.
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 system effectively maintains the temperature of the cylindrical coil within a controlled range, preventing overheating and ensuring continuous operation even under rated and overloaded conditions, thereby enhancing the motor's performance and longevity.
Implementation Method 1
the refrigerant liquid is supplied to the air space to allow the cylindrical coil, which generates heat, to vaporize the refrigerant liquid so as to cool itself by latent heat of vaporization of the refrigerant liquid
Implementation Method 2
cool the cylindrical coil by latent heat of vaporization of the refrigerant liquid
Data Source
AI summary
A coreless rotating electrical machine for being operated continuously comprises a stator including an energizable coreless cylindrical coil and a lid-type mount; and a rotor including a cup-type mount. The lid-type mount is equipped with a channel for supplying a refrigerant liquid to the air gap. The coreless rotating electrical machine is operated continuously by supplying the refrigerant liquid into the air gap, allowing the cylindrical coil, which generates heat, to vaporize the refrigerant liquid, cooling the cylindrical coil by latent heat of vaporization, and repeating an operation of supplying the refrigerant liquid to prevent a temperature of the cylindrical coil exceeding an allowable maximum temperature, and an operation of adjusting the supply of the refrigerant liquid to prevent the temperature of the cylindrical coil falling below a minimum temperature, so as to maintain the temperature in a range between the allowable maximum and minimum temperatures.