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https://www.magicmag-tech.com/comparison-of-cooling-methods.html
During the operation of an adjustable speed magnetic coupling, a speed difference (slip) exists between the driver and driven rotors, generating an eddy current effect in the conductor disc. The eddy currents produce a significant amount of heat. If this heat is not removed promptly, it can lead to excessive temperature rise of the equipment, thereby damaging components such as permanent magnets, bearings, and seals. Therefore, the cooling system is crucial.
The main cooling methods can be categorized into the following four types:NATURAL COOLING
Principle: Relies on natural convection and heat radiation between the magnetic coupling's own housing surface and the surrounding air for heat dissipation. Heat dissipation fins are often designed on the housing to increase the surface area.Characteristics:● Simple structure, no additional auxiliary equipment, low cost.● Easy maintenance, as there are no rotating fans or circulating pumps.● Low cooling efficiency, limited heat dissipation capacity.Applicable Scenarios:● Applications with low power and low slip operation.● Typically for transmitting relatively small power (e.g., below several tens of kilowatts).● Applications sensitive to equipment size and cost.FORCED AIR COOLING
Principle: A fan is installed at the input or output end of the magnetic coupling to force air flow over the finned housing surface, rapidly carrying away heat through convection.Classification:● Integrated Fan: The fan is directly mounted on the rotor shaft, rotating synchronously with the equipment speed. Compact structure, but cooling effect decreases at low speeds.● Independent Fan: Uses a separate, motor-driven fan. The cooling air volume is independent of the host speed, allowing optimal cooling performance to be maintained consistently, but the system is more complex and costly.Characteristics:● Cooling efficiency is higher than natural cooling.● Relatively simple structure, moderate cost.● Fan operation generates noise.● In harsh environments with high dust, humidity, etc., the fan and fins may become clogged, affecting heat dissipation.Applicable Scenarios:● Medium to low power applications operating in relatively clean conditions.● Air cooling is currently one of the most widely used cooling methods.WATER COOLING
Principle: A cooling water jacket is designed inside the conductor disc or housing of the magnetic coupling. Circulating coolant flows through the jacket, directly carrying away the heat.Characteristics:● Extremely high cooling efficiency, far superior to air cooling.● Stable heat dissipation capacity, unaffected by ambient temperature and equipment speed.● Complex structure, requires additional water circuit system (water pump, tank, pipes, etc.), resulting in higher cost and maintenance requirements. Risk of water leakage exists, and water quality treatment is necessary to prevent scaling and corrosion.Applicable Scenarios:● High power, high slip, continuous heavy-duty operating conditions.● Confined spaces with poor ventilation or high ambient temperature (e.g., underground mines, ship engine rooms).● Systems where heat needs to be collected and managed centrally.OIL COOLING
Principle: The core components (permanent magnet rotor and conductor rotor) of the magnetic coupling are sealed within a cavity filled with cooling oil. The oil acts as both a cooling medium and provides lubrication and insulation. The circulating oil is cooled via an external heat exchanger (typically oil-to-water or oil-to-air).Characteristics:● Very high and uniform cooling efficiency.● Smooth operation and low noise.● Most complex structure, requires extremely high sealing standards, highest manufacturing and maintenance costs.● The oil medium itself requires maintenance and periodic replacement.Applicable Scenarios:Very high power, extreme operating conditions, or applications with extremely high reliability requirements.SUMMARY AND COMPARISON
COOLING-DOWN METHOD PRINCIPLE ADVANTAGES DISADVANTAGES APPLICABLE POWER RANGE/SCENARIO NATURAL COOLING Natural convection and radiation Simple structure, no power consumption, less maintenance, low cost Poor heat dissipation Small power (typically <75kW), low slip FORCED AIR COOLING Fan forced air convection High efficiency, moderate cost, wide application There is noise and fear of dust blockage Medium low to medium high power (up to 2000kW or more), general use WATER COOLING The circulating water is directly cooled inside High efficiency, stable heat dissipation and strong environmental adaptability The system is complex, costly and prone to leakage High power, heavy load, high temperature, closed environment OIL COOLING Internal cooling and lubrication of circulating oil High efficiency, stable operation and good reliability The structure is the most complex, the cost is the highest, and the maintenance requirements are high High power, extreme working conditions, high reliability requirements SELECTION SUGGESTIONS:
When selecting the cooling mode of speed-regulated magnetic coupling, it is necessary to comprehensively consider the transmission power, slip size, operating environment, equipment cost and maintenance capacity. Usually, the equipment manufacturer will recommend the most appropriate cooling scheme according to the specific working conditions of users.
https://www.magicmag-tech.com/comparison-of-cooling-methods.html
SHANGHAI GAOLV E&M Technology Co.,Ltd.
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