Electric motor knowledge | Why can't the motor reverse
As a direct interface device with the equipment, the rotation direction of the constant force motor is particularly important. According to the product standards for motors, unless otherwise specified, the motor should rotate clockwise when viewed from the shaft extension end after being connected in the correct phase sequence. This ensures the compliance between the equipment and the motor installation. However, for special cost requirements, the motor will also be manufactured counterclockwise.
For Hengli motor products, different rotation directions also involve a problem, which is the matching relationship between the fan carried by the motor and the rotation direction of the motor. Especially for high-speed motors, if a centrifugal fan with directional requirements is used, if the motor does not rotate in the design direction, it will cause a sharp rise in the temperature of the motor winding, which will then cause damage to the motor bearing system, that is, the degradation and failure of the bearing grease, resulting in bearing damage due to lubrication failure, and in severe cases, the winding will overheat and burn out.
Therefore, for motors with rotation direction requirements, the manufacturer of Hengli motors should communicate fully with the user to avoid similar problems from occurring.
Why is the number of fan blades for motor 1 odd?
This is because odd numbered blade combinations can bring more performance advantages than even numbered blade combinations. If the number of blades is designed to be even and symmetrically arranged, it will not only make it difficult to adjust the balance of the fan itself, but also easily cause more resonance when the fan rotates at high speed, resulting in the blades being unable to withstand the fatigue caused by resonance for a long time, and ultimately leading to blade fracture and other situations. Therefore, the design of axial fans is often an asymmetric odd blade design.
Introduction to 2 Turbofans
Turbofans, also known as centrifugal fans, are commonly used in the field of personal computer cooling. Small centrifugal fans are commonly referred to as turbofans. The gas flow direction of a turbofan is perpendicular to the shaft, while the gas flow direction of a common axial fan is parallel to the shaft. Compared to traditional cooling fans, centrifugal fans can output larger air volume in a smaller space occupation, improving the cooling effect. However, the machining accuracy of centrifugal fan blades is higher than that of ordinary fans, and the noise emitted when the impeller has accumulated dust or is running at high speed is also greater. With the decrease in CPU power consumption, CPU turbofans are gradually being replaced by large-diameter low-speed conventional axial flow silent fans, but they are still frequently used in high-performance graphics cards, especially in the heat sink of public graphics cards.
A centrifugal fan is driven by a motor to rotate the impeller, and the blades in the impeller force the gas to rotate, doing work on the gas and increasing its momentum. Under the action of centrifugal force, the gas is thrown out around the impeller, and the kinetic energy is converted into pressure energy through the vortex shell. When the gas inside the impeller is discharged, the pressure inside the impeller is lower than the pressure inside the inlet duct. New gas is sucked into the impeller under the pressure difference, and the gas is continuously discharged from the fan.
Turbofans are commonly installed on small printers or smaller short form digital printing equipment, at the bottom of the substrate platform, to generate suction and fix soft materials so that they do not deform or shift during the printing process.
