In the face of extreme high temperatures, what breakthroughs have been made in the cooling methods of custom three phase wound rotor motors?

1. Heat sink optimization: expanding the heat dissipation "battlefield"
In the heat dissipation system of custom three phase wound rotor motors, heat sinks can be called the vanguard, shouldering the heavy task of heat conduction and dissipation. Its most significant advantage is that it greatly improves the heat dissipation efficiency by expanding the contact area between the motor and the outside air. The heat sink area of ​​traditional motors is relatively limited, and the heat transfer speed is difficult to meet the heat dissipation requirements under complex working conditions. The customized three-phase wound rotor motor takes a different approach and carefully designs a large area of ​​heat sinks on the surface of the motor casing. These heat sinks are like "wings" stretching outward, greatly expanding the "battlefield" of heat dissipation.
In terms of material selection, the heat sinks of custom three phase wound rotor motors are mostly made of metal materials with high thermal conductivity, such as aluminum alloy. Aluminum alloy not only has good thermal conductivity and can quickly conduct the heat generated inside the motor to the surface, but also has a light weight and will not increase the overall weight of the motor too much, which is conducive to the installation and operation of the motor. In terms of shape design, a fin structure is usually used. The heat sink of this structure is shaped like a fish fin and has a unique geometric shape. It can effectively cut the air, causing the air to form turbulence on its surface and breaking the air boundary layer, thereby significantly improving the heat exchange efficiency between the air and the heat sink. Compared with traditional flat heat sinks, the fin structure can improve the heat dissipation efficiency by more than [X]%.
The arrangement of the heat sinks has also been carefully considered. They are not randomly stacked, but arranged in an orderly manner according to a certain spacing and angle. Reasonable spacing can not only ensure that there is enough air circulation space between the heat sinks to avoid air flow obstruction, but also make full use of the limited shell surface area to maximize the number of heat sinks. Generally speaking, the heat sink spacing will be accurately calculated according to the power, operating environment and heat dissipation requirements of the motor. The angle design of the heat sink is to guide the direction of air flow so that it can pass over the heat sink surface more smoothly and enhance the air convection effect. For example, in some motors that need to be installed vertically, the heat sink will be designed at a certain tilt angle to better utilize the principle of hot air rising, promote natural air convection, and further improve the heat dissipation efficiency.

2. Improvement of ventilation path: Creating an efficient heat dissipation "channel"
In addition to the "hardware" facility of the heat sink, the customized three-phase wound rotor motor has also made great efforts in optimizing the ventilation path and carefully created an efficient heat dissipation "channel". The air duct structure inside the motor is like the vascular system of the human body, responsible for transporting cooling air to various heating parts and taking away heat. The optimized air duct structure can make the cooling air flow more smoothly inside the motor, significantly improving the heat dissipation effect.
Setting a guide plate inside the motor is one of the key measures to optimize the ventilation path. The guide plate is like a traffic policeman, which can accurately guide the air flow to key parts with high heat generation, such as windings and iron cores. As the core component of the motor, the winding will generate a lot of heat in the process of converting electrical energy into mechanical energy, and the iron core will also generate heat due to hysteresis and eddy current losses under the action of the alternating magnetic field. The guide plate accurately guides the cooling air to these heating areas through clever layout and shape design to ensure that the heat can be taken away in time. For example, setting an annular guide plate around the winding can make the air flow in an annular manner, wrapping the winding in all directions, and achieving efficient heat dissipation; setting a long strip guide plate in the axial direction of the core can guide the air to flow along the length direction of the core to enhance the heat dissipation effect of the core. At the same time, the reasonable design of the position and size of the air inlet and outlet is also a crucial link. The position of the air inlet needs to be carefully selected to ensure that fresh air with low temperature and low dust content can be introduced. Usually, the air inlet is set at the bottom or side of the motor, away from heat sources and dusty areas. The position of the air outlet should consider the air flow direction and exhaust efficiency. It is generally set at a higher position on the top or side of the motor so that the hot air can rise naturally and be discharged smoothly. The size of the air inlet and outlet also needs to be accurately calculated according to the power of the motor, the heat dissipation requirements, and the resistance of the internal air duct. An overly large air inlet or outlet may cause the air flow rate to be too fast, increase wind resistance and noise, and also affect the air pressure balance inside the motor; while an overly small air inlet or outlet will limit the air flow and fail to meet the heat dissipation requirements. By scientifically and rationally designing the air inlet and outlet, good convection can be formed inside the motor, effectively improving the heat dissipation efficiency and ensuring that the motor can operate stably under complex working conditions.

4. Special cooling method: coping with extreme environmental challenges
In some extremely high temperature environments, such as the blast furnace ironmaking workshop in the metallurgical industry, the furnace next to the glass manufacturing industry, and the high-temperature reactor near the chemical industry, the motor faces unprecedented heat dissipation challenges. At this time, relying solely on natural heat dissipation and ordinary ventilation methods is far from meeting the needs. custom three phase wound rotor motors will enable special cooling methods to ensure that they can still maintain a stable operating temperature in harsh environments.
Forced air cooling is a commonly used special cooling method. It installs a fan on the motor to force the outside cold air into the motor to accelerate the heat dissipation. The power and air volume of the fan will be accurately matched according to the heating of the motor. When selecting a fan, it is necessary to comprehensively consider factors such as the power of the motor, the operating environment temperature, the heat dissipation requirements, and the performance parameters of the fan. For example, for a high-power motor running in a high-temperature environment, it may be necessary to equip it with a high-power, high-air-volume centrifugal fan to ensure that sufficient cooling air flow can be provided. At the same time, the installation position of the fan also needs to be carefully designed. The fan is usually installed at the air inlet of the motor so that the cold air can directly enter the motor under the action of the fan to form an efficient cooling airflow. Forced air cooling can quickly reduce the temperature of the motor in a short time, effectively solve the problem of motor heat dissipation difficulties in high temperature environments, and provide a strong guarantee for the stable operation of the motor.
The water cooling method is the "ultimate weapon" for custom three phase wound rotor motors under extreme heat dissipation requirements. The water cooling system uses circulating cooling water to absorb the heat generated by the motor by setting cooling water pipes inside the motor, and its heat dissipation efficiency is much higher than that of the air cooling method. The cooling water pipe is usually made of copper pipes or stainless steel pipes. These pipes have good thermal conductivity and corrosion resistance, and can ensure stable operation in complex industrial environments. The water cooling system is generally composed of cooling water tanks, water pumps, water pipes, and temperature control systems. The cooling water tank is used to store cooling water, and the water pump is responsible for extracting cooling water from the water tank and transporting it to the cooling water pipe inside the motor through the water pipe. After absorbing the heat generated by the motor, it flows back to the water tank. The temperature control system can monitor the temperature of the motor in real time and automatically adjust the speed of the water pump and the flow of cooling water according to the set temperature value to ensure that the motor always remains within a safe operating temperature range. The water cooling method can accurately control the temperature of the motor, and even in extremely harsh high-temperature environments, it can also make the motor run stably, greatly improving the reliability and service life of the motor.