Many large factories and workshops now use hvls fans for ventilation and cooling. Comparing hvls fanss from different manufacturers, the price difference is more than double. Why is this? Below, CorTec will introduce to you why the price of hvls fans is so different?

Different motors, performance, and cost will lead to large price differences in large fans. The service life of the reduction motor is usually about 3 years, because the reduction motor drives the transmission shaft to rotate through the reducer, and there is a gear in the middle, which will cause Friction, friction will cause loss, so the service life is very short.

If the hvls fans uses a reduction motor, the gear and the transmission shaft will be driven by the reducer to work together, and part of the power will be consumed during the friction process. Therefore, the energy efficiency ratio of the reduction motor can only reach about 78%, which belongs to level three. Energy efficiency has been gradually eliminated. Therefore, the power consumption of a large industrial fan with a reduction motor is mostly 1.5 degrees per hour.

Noise is also a very important factor. When a large industrial fan using a reduction motor is working, it drives the transmission shaft through a gear, which generates friction and generates noise. The noise generated by the reduction motor is above 68 decibels, and the longer it is used, the larger the gear gap is and the greater the noise will be.

For hvls fans that use reduction motors, if there is a sudden power outage or power outage, the reduction machine will suddenly get stuck, but the blades are still rotating. At this time, the blade tips rotate very quickly. This will cause shearing force between the blades and the petiole, which is commonly known as inertia, which will cause the bolts connecting the petiole and the blade to loosen. In severe cases, it may even cause the blade to fall off or break. 

This is very dangerous. 

However, this phenomenon will not occur with large industrial fans that use permanent magnet direct-drive internal rotor motors. It relies on the magnetic field to rotate. If there is a sudden power outage or power outage, the fan blades will move freely and stop slowly.

They will not suddenly get stuck and avoid the risk of the blades falling off or breaking.