Centrifuge: brushed, brushless motor

Many friends may have some doubts about the parameters of the centrifuge. Many users are asking, what is the difference between brush and brushless? Now explain the explanation in the simplest and most understandable way. I hope the centrifuge users have Understand.

First, brushless motor

The so-called brushless motor means no brush! Its no-load resistance mainly comes from the rotating contact point between the rotor and the stator, so the general brushless motor uses ball bearings at both ends of the rotor to reduce friction! In this way, the centrifuge will not have a large amount of frictional resistance and heat (in fact, it will still generate heat, but the heat source comes from the resistance loss on the coil), and it has extremely high efficiency (80%-90%) and high speed! General application on models that require high power output, providing excellent power!

Second, brush motor

The so-called motor is the main component in the centrifuge, divided into brush and brushless and frequency conversion. The two brushes (copper brush or carbon brush) of the brush motor are fixed on the motor back cover through the insulating seat to directly introduce the positive and negative poles of the power source to the commutator of the rotor, and the commutator communicates with the coil on the rotor. The alternating polarity of the three coils alternates with the two magnets fixed on the outer casing to rotate and rotate. Since the phase changer is fixed to the rotor and the brush is fixed to the outer casing (stator), the friction between the brush and the phase changer is generated when the motor rotates to generate a large amount of resistance and heat. Therefore, the efficiency of the brush motor is very low. But it has the advantages of simple manufacturing, low cost and low cost!

Third, the definition of DC brushless motor

There are often people who call a DC brushless motor but the brushless motor used in the model is a 3-phase AC motor. Then why can we drive him with ordinary DC power? The secret is the brushless electronic governor we use! The fundamental difference between a brushless electronic governor and a brushed electronic governor is that the brushless electronic governor converts the input DC power source into a three-phase AC power source to provide power to the brushless motor.
Then, when it comes to brushless motors, we have to care about its KV value. KV is a unit of speed equal to RPM/V, which is the no-load speed per minute obtained per 1V voltage. Speed ​​= KV value * voltage.

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