Analysis of advantages and disadvantages of centri

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Analysis of the advantages and disadvantages of laboratory centrifuge motors

there are many kinds of centrifuges. How to choose centrifuges is a tedious thing, which can also be called a science. Not to mention anything else, take the accessories centrifuge motor for example. The same centrifuge is equipped with brush motor and brushless motor. The above situation often occurs when customers buy centrifuges. There are some models of centrifuges, brushless motors or other motors in the parameter table. The prices of these kinds of motors are different, and each has its own use, so customers have difficulties in choosing centrifuge motors. Next, I will compare the advantages and disadvantages of these two kinds of PVC plastic layers with quench machine motors for your reference

I. advantages and disadvantages of the centrifugal brush motor

the brush motor uses carbon brushes at the internal structural electrodes of the motor. The two brushes (copper brush or carbon brush) of the centrifugal motor are fixed on the back cover of the motor through an insulating seat, and the positive and negative poles of the power supply are directly introduced to the inverter of the rotor, which is connected to the coil on the rotor, The polarity of the three coils is constantly alternating, and the two magnets fixed on the shell form a force to rotate. Advantages: it has the advantages of simple manufacture and low cost! Disadvantages: generally, the working speed is constant after starting, and the speed regulation is not easy. Because the inverter is fixed with the rotor, and the brush is fixed with the housing (stator), the brush and the inverter constantly rub when the motor rotates, resulting in a lot of resistance and heat. Therefore, the efficiency of brush motor is low and the loss is very large

II. Advantages and disadvantages of brushless motor of centrifuge

brushless motor, as the name suggests, is that there is no carbon brush at the electrode of 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 at both ends of the rotor to reduce friction! In this way, there won't be a lot of friction. They have to bear the historical friction and heat (in fact, it will still heat, but the heat source comes from the resistance loss on the coil), with extremely high efficiency (more than 80%-90%) and high speed! Usually, it is digital frequency conversion control, which has strong controllability. It can be easily realized from a few revolutions per minute to tens of thousands of revolutions per minute. Generally, the application policy of "left and right bow" provides excellent and powerful power on models that need high power output! The disadvantages are: the cost of its speed control system is higher than that of the brush high-speed motor, and the controller of the centrifuge is prone to failure in use. Now we see more brushless DC motors

the above two kinds of motors are common motors, which are suitable for different occasions. The manufacturing cost of brush motor of centrifuge is low, so the market price is relatively affordable, and the working speed is constant after starting. It is suitable for general laboratories and scientific research institutions. At present, brush motors have been dominant, 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 the price is high, it has won the praise of large laboratories and scientific research institutions. 1. We must check whether the abetting lamp equipped is accurate; During the use process, the equipment nut 1 must be tightened regularly, especially the characteristics of environmental protection, long service life and energy saving, which make it more and more widely used in centrifuges

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