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Introduction to DC Heat Dissipating Fan Motor (Beauty of DC Heat Dissipating Fan)

from:International Sports Carnival published_at:2018-12-04 20:24:31 pv:482

Shenzhen Tengshi Youchuang Technology Co., Ltd. is a factory specializing in the production of DC heat dissipation fans. Now Tengshi Youchuang Technology will give you a detailed explanation. I. Introduction to DC heat dissipation fan motor (beautiful picture of DC heat dissipation fan)

Namely: DC cooling fan brushless motor abbreviation, it is divided into two kinds: one is the internal rotor brushless motor, the other is the external rotor brushless motor. The corresponding product is called carbon brush motor.


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Two: The difference between brushless motor of DC cooling fan and carbon brush motor:

1: Generally speaking, the heat dissipation of the brushless motor is better than that of the carbon brush, especially the outer rotor.

2: Brushless power efficiency is relatively high, and a part of the carbon brush will be consumed on the friction heat energy of the brush, so it will be relatively low.

3: If it is under the premise of normal use (no high temperature, no overload, no external impact, etc.), brushless motor can be said to have no service life limit because of the wear problem of no carbon brush.

4: The loss rate of brushless motors is much larger than that of brushless motors, and some of them are even hundreds of times different. Especially when they are also used in speed aircraft, the difference is particularly obvious. Considering from this point of view, brushless motors are much more effective than carbon brush motors as long as they do not fall into damage, so as to compare their service life and performance with the price factor.

5: Dynamics degradation is a common problem of carbon brushes, but brushless brushes do not have this problem.

6: Carbon brushes need to be cleaned regularly and run in; brushless without this problem.

7: At the same output power, the brushless weight will be lighter than the carbon brush.

8: Because the carbon brush is confined to the spring bracket of the brush, it has bouncing problem, so the speed of the brushless will be faster than that of the carbon brush.

 

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3. Definition of inner-rotor brushless motor and outer-rotor brushless motor:

1: Inner rotor brushless motor: refers to the motor axis rotation, coil in the motor housing, magnet in the axis.

2: Outer rotor brushless motor; refers to the motor shell will rotate, coil in the axis, magnet on the shell.

Fourth, the advantages of inner rotor brushless motor and outer rotor brushless motor:

1: Advantages of inner rotor brushless motor: Generally speaking, because of its smaller diameter, it is more conducive to the exertion of high speed torque.

2: The advantages of brushless motor with external rotor are better heat dissipation and larger diameter, which is more conducive to the exertion of low-speed torque.

Fifth: Advantages of Brushless Motor for DC Heat Dissipating Fan:

1: Brushless efficiency:

Under the same current, the power increases, the flight time increases, the brushless torsion, the speed is generally better than the carbon brush, and the power consumption is less. Therefore, using brushless, whether slow or fast, using the same battery, the idle time will be longer.

2. Brushless function:

Fast-flying aircraft need greater pull and thrust, brushless motor will be better, so fly more satisfied.

 

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Sixth: About the Brushless Initial Way of DC Heat Dissipating Fan:

First order the aircraft, then decide the brushless power combination, because most people are playing with the aircraft for the purpose, power is only one of the means, so it is recommended to start from their own comparative skilled aircraft to change the brushless.

Seven: How to distinguish between helicopter motor and aircraft motor?

1: According to forward pull and backward push: helicopters generally use forward pull motor; aircraft generally use backward push motor.

Front pull motor: refers to the motor which is placed in front of the machine;

Back-push motor: refers to the motor which is placed behind the machine.

2: According to the magnet: there are 6 magnets in the motor for helicopter and 12 magnets in the motor for aircraft.

3: According to the KV value of motor: Generally speaking, the KV value of aircraft motor is relatively low; the KV value of helicopter motor is relatively high.

Eighth: What is the KV value of DC heat dissipation fan?

KV = PRM / V = speed per volt, referring to the speed of the motor. The internal resistance and current of motors with different KV values are different when they idle, so their power consumption is also different.

High KV value, can be matched with a variety of deceleration groups to meet the requirements;

Brushless motor with low KV value is used for direct drive.

Inner rotor brushless KV value is relatively high, suitable for over reducer, low voltage can play a better efficiency;

Outer rotor brushless KV value is relatively low, suitable for playing 3D machine to drive the oar directly.

Nine: How to calculate the actual KV value:

1: Using about 70_of KV value when there is load speed, we can know how big the propeller is.

2: Find a light and thin material to make a shade, cut it into the following figure, the diameter slightly exceeds the motor shell, then measure the voltage and speed at that time, then divide the speed by the load voltage, that is, the KV value of the motor. Eg:

The measured speed is 28000RPM and the load voltage is 12.3V (the voltage measured when the motor rotates)

That is KV = 28000 RPM / 12.3V = 2276KV.

10: The problem of brushless positive and negative inversion of DC heat dissipation fans:

There are three wires on the brushless motor. If you change two wires, you can change the positive and negative of the motor. Usually, you don't change the two sides in the middle.

Eleven: What is the idle speed of the DC heat dissipation fan?

It refers to the speed of every volt motor in the condition of no load (without propeller).

Twelve: Why is the brushless energy conversion efficiency of DC cooling fan higher than that of carbon brush?

Because with the same battery capacity and the same motor kinetic energy output, brushless can output eg longer than carbon brush.

With 370 deceleration group; with 7.5*5 propeller; with 7.4 V 2300 mAh lithium power; full speed about 8A; flying down the motor is very hot, flying time is about 15 minutes.

With an external rotor brushless 400T; direct drive 7.5*5 propeller; with 7.4V2300mAh lithium power; full speed about 8A; fly down the motor temperature, flight time about 20 minutes.

Thirteen: What does the 3S2P of DC heat dissipation fan mean?

It refers to three strings in two parallel, that is, three times the voltage (motor speed), two times the capacity (operation time) and six times the weight. Eg:

If there are six batteries with 3.7V1000mAh:

When the batteries are in series, the code number is S, 3S, that is, three batteries are in series, the voltage is 3.7+3.7+3.7=11.1V; the capacity is 1000mAh unchanged; the motor speed is increased three times, and the running time is unchanged.

When the battery is in parallel, the code number is P, 2P, that is, two batteries are in parallel, the voltage is unchanged at 3.7V; the capacity is increased by 1000+1000=2000mAh; the speed of the motor is unchanged, and the running time is doubled.

Tips: Series voltage added, parallel current and capacity added.

14: What is a DC cooling fan 130, 280, 370, 540, 2030, 2040 motor?

These figures indicate the motor's standard model.

Generally, the numbers 130, 280, 370, 540 represent the specifications of the brush motor, and the length of the motor. Generally speaking, the longer the motor is, the greater the power is.

The brushless motor of DC cooling fan is generally nominated by both diameter and length, such as: 2030 grade: that is to say, the diameter of motor is 20 mm, the length is 30 mm (the diameter is in front of the nominal, the length is in the back). Of course, there are also brushless motors using 130, 280, 540, such nominal, but this has nothing to do with the size of the motor, nor can it be equivalent to the carbon brush motor of DC cooling fan. Lattice.


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