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Micro DC motor: performance difference between brushless motor and brushless motor


stay Micro DC motor The most obvious difference between the two kinds of micro DC motor is that one has brush and the other has no brush. In addition to the differences in brushes, what are the differences in performance?


The brush DC motor adopts mechanical commutation, the magnetic pole is not used, and the coil rotates. When the micro DC motor is working, the coil will drive the commutator to rotate. The current direction change on the coil is completed by the friction between the brush and the commutator. The brush and the commutator will produce friction and cause loss. The general service life is only several hundred hours, not for products that need continuous operation Enough, large brush DC motor also need to replace the carbon brush regularly.


 Micro DC motor


The brushless DC motor solves this problem by using electronic commutation. The coil of the micro DC motor is stationary and the magnetic pole rotates. Electronic commutation is to sense the position of permanent magnet pole through Hall sensor, and to ensure that the magnetic direction generated is correct by sensing the current direction in the real-time switching coil, so as to drive the micro DC motor.


The speed regulation mode of Brushless DC motor is different from that of Brushless DC motor. The speed regulation of Brushless DC motor is very simple, while that of Brushless DC motor is more complex.


The principle of speed regulation is to control the voltage, but the brushless DC motor uses electronic commutation, so it needs digital control, so it is more complex. In the process of speed regulation, the voltage supplied by the micro DC motor is unchanged. By changing the control signal of the electric regulation, and then changing the MOS through the microprocessor This is called a variable speed switch to change the speed.


Brush micro DC motor is commutation through the brush, through the analog circuit of SCR drive can be controlled, very simple, as long as the micro DC motor power supply voltage can be adjusted, the voltage and current through commutator brush conversion changes the strength of the electrode magnetic field, thus changing the speed, this is called variable voltage speed regulation.



Performance difference between brushless and brushless DC motor


The structure of brush micro DC motor is simple and easy to be controlled. It also has the characteristics of fast response, large starting torque and stable speed change. The vibration is almost not felt from the starting to the maximum speed, and it can drive more load. Small starting torque and small DC motor power drive.


 Gear motor


In terms of speed regulation, the brushless micro DC motor is regulated by voltage regulation. The starting and braking are relatively stable, and the constant speed operation is stable. The brushless micro DC motor is controlled by frequency conversion, and the speed is controlled by frequency change. Therefore, the brushless micro DC motor will be stable only when the speed is constant. In terms of control accuracy, the control precision of brushless micro DC motor will be higher, and the brushless micro DC motor needs limiter to achieve higher precision control.


In terms of cost, the cost of Brushless DC motor is lower, and the cost of Brushless DC motor is higher. But brushless DC is that you have no brush, and there is no friction when running, which greatly reduces electromagnetic interference, noise will be lower, and service life is longer. For example, the service life of brush micro DC motor is hundreds of hours at most, while brushless DC motor can reach thousands to thousands Hours, the speed also has a very large degree of improvement, up to 10 More than 10000 rpm.


 Brush micro DC motor ​​​


Brushless DC motor combines the characteristics of brush micro DC motor, mainly because the control is more complex and the cost is high. Therefore, in practical application, in addition to the brush micro DC motor parameters can not meet the situation, or the application of brush DC motor is more.



For more information on micro DC motor, please continue to pay attention to Tianfu micromotor.

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Dongguan Tianfu Electric Machinery Technology Co., Ltd. copyright copyright? 2018 technical support: Dongguan website construction Yue ICP Bei 18062917 [ BMAP ] [ GMAP ] [ back-stage management ]
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