What does the number of stages of the motor used in a fan refer to?
Thread Content
For air-cooled plate-fin heat exchangers used in screw compressors, what does it mean by the number of stages in the accompanying fan? What do different stages indicate regarding the air volume? Please help!
Does it refer to the number of poles of the motor or the number of stages of the fan? A two-pole motor refers to a motor with 3000 revolutions per minute, while a four-pole motor refers to a motor with 1500 revolutions per minute. . .
Could you answer all of them? I’m not too sure either; it should be about how many stages the fan has
The motor doesn’t mention any \"stages,\" nor has anything been heard about stages being present. The so-called “poles” of a motor refer to the number of pole pairs in the motor. Its value determines the speed of the motor. Like a bipolar motor, it has an N pole and an S pole. The synchronous speed is 3000 revolutions per minute ； A quadrupole motor has two N poles and two S poles. The synchronous speed is 1500 revolutions per minute ； A six-pole motor has three N poles and three S poles. The synchronous speed is 1000 revolutions per minute ； ......
Well, for centrifugal fans, the number of stages corresponds to the number of impellers they have. Axial flow fans are typically divided into sections, with several sets of blades in each section.
After reading this, my understanding regarding fans is that they use multiple stages of pressurization; perhaps the owner needs a high pressure level for cooling air； The air volume is primarily determined by the diameter of the first-stage impeller. I’m not sure if it’s correct!
I’ve never seen fans with a grading system; there are only multi-stage compressors.
The number of pole pairs in a permanent magnet motor refers to the number of N and S pole pairs in the permanent magnet rotor (or stator). The number of poles is the total count of N and S poles. Pole pairs = number of poles / 2; therefore, 10 poles correspond to 5 pole pairs. The magnetic poles of a motor appear in pairs. Therefore, expressed in terms of pole pairs, the speed of a two-pole motor is 3000 revolutions per minute, that of a four-pole motor is 1500 revolutions per minute, that of a six-pole motor is 1000 revolutions per minute, and that of an eight-pole motor is 750 revolutions per minute, and so on. The above refers to the nominal speed of generators in China. The speed of the motor is slightly lower than this value. There is still an error in the actual rotational speed.
I think it refers to the number of stages of the motor; in other words, it indicates how many revolutions per minute the fan makes
It refers to the number of stages of the motor; the cooling fan does not require high pressure, so it cannot be a multi-stage Roots blower.