Comparison of advantages and disadvantages of brushless motor and brushless motor in laboratory centrifuge

There are many kinds of centrifuges. How to choose a centrifuge is a cumbersome thing, and it is also a matter of learning. Nothing else to say, take the accessory centrifuge motor, the same centrifuge is equipped with a brush motor, brushless motor. The above situation often occurs when customers purchase centrifuges. There are some types of centrifuges, brushless motors or other motors in the parameter list. These motors have different prices and are useful, so customers are having trouble choosing a centrifuge motor. Below I will compare the advantages and disadvantages of these two centrifuge motors, for everyone to make a reference.

First, the advantages and disadvantages of the brushed motor of the centrifuge brush motor is the use of a carbon brush in the internal structure of the motor, the two brushes of the centrifuge motor (copper brush or carbon brush) is fixed on the motor back cover through the insulation seat Directly introducing the positive and negative poles of the power supply to the commutator of the rotor, and the commutator is connected to the coil on the rotor. The alternating polarity of the three coils alternates with the two magnets fixed on the outer casing to rotate. . Advantages: It has the advantages of simple manufacturing, low cost and low cost! Disadvantages: Generally, the working speed is constant after starting, the speed regulation is not very easy, because the phase changer is fixed with the rotor, and the brush is fixed with the outer casing (stator), the friction between the brush and the phase changer is generated when the motor rotates. Resistance and heat. Therefore, the efficiency of the brush motor is very low.

Second, the advantages and disadvantages of centrifuge brushless motor Brushless motor as the name suggests is that there is no carbon brush in the internal structure of the motor! Advantages: 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 on both ends of the rotor to reduce friction! This will not have a lot of frictional resistance and heat (in fact, it will still be hot, but the heat source comes from the resistance loss on the coil), with extremely high (80%-90%) efficiency and high speed! Usually it is digital frequency conversion control, which is highly controllable. It can be easily realized from a few revolutions per minute to tens of thousands of revolutions per minute. It is generally applied to models that require high power output to provide excellent power! The disadvantage is that the speed control system is higher than the speed control system of the brushed high-speed motor, and the controller of the centrifuge is prone to failure during use. The DC brushless motor is now seen more.

Both of the above motors are common motors for different applications. The brushed motor of the centrifuge has a low manufacturing cost, so the market price is also relatively affordable, and the working speed is constant after starting. It is suitable for general laboratory and scientific research units. At present, brush motors have always dominated, but with the increasing technical requirements, the application of brush motors in centrifuges is slowly decreasing. The brushless motor has strong controllability, low power loss, low noise, no dust and environmental protection. Although it is high in price, it has been favored by large laboratories and scientific research units, especially for environmental protection, long service life and energy saving. The characteristics make it more and more widely used in centrifuges.

Disposable Pressure Transducer 2

Disposable pressure transducer(For Intervention Use)

Disposable Pressure Transducer(For Intervention Use)

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