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What should be paid attention to when choosing a brushless DC motor

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What should be paid attention to when choosing a brushless DC motor

date:2018-01-16 author: click:

Many people who use brushless motors for the first time are very puzzled about what brushless motors to choose. Selecting a suitable brushless motor should be evaluated comprehensively from the performance, price and other parameters of the product. For any industrial product, the principle of selection of components and raw materials is to meet the appropriate demand at the lowest cost.

The cost of brushless motor is mainly in the drive plate, so the price of single-phase is far lower than that of three-phase. The external rotor brushless motor is only cheap, mainly because the external rotor motor can use single-phase drive. The advantage of single phase is that the price is low, and the drawback is that the torque is small and the power is low. The single-phase external rotor should have the same torque as the three phase, and the size of the motor should be bigger. Some occasions that require less torque, such as driving fans and so on, are enough for external rotor.

The inner rotor brushless motor has high price, fast speed and large torque. For example, car vacuum cleaner, brushless motor is used in the rotor, the speed up to more than 30000 rpm! The inner rotor is usually three phase, but the capacity of the inner rotor is low, the inner rotor winding is more complex than the outer rotor, and the production capacity is much lower, and the production capacity of the factory is tested in mass production. The internal rotor brushless motor price is usually tens of yuan, and the higher the power price is, the higher the general high-end occasion can be used.

Besides, the brushless deceleration motor is said. Brushless motors are currently dominated by small power, and the price of brushless motors with a power of over 1 kilowatts is very high. Therefore, under the condition of large torque, the common brushless motor usually needs to add the use of the gearbox. At this time, the gearbox becomes a short board. Good performance reducer, such as planetary reducer is very expensive, its life can reach 8 thousand hours, and the ordinary decelerator price is low, but the life of only 2000 hours. The idea that the life of brushless speed reducer is as high as tens of thousands of hours is to ignore the short board of the gearbox. The price of the carbon brush motor and the reduction box usually only cost more than ten yuan, but the service life is only tens of hours to hundreds of hours. Brushless motor with planetary reducer, the price of 100 yuan, one, the service life increased by more than ten times, but the cost increased by ten times. The price of a planetary gearbox is more than 60 yuan. The price of Brushless DC motor is much lower than that of ordinary reduction gearbox, but personally, it is a bit of a waste of motor performance.

It is not recommended to use ordinary brushless motor for low speed and precise control of rotation. The stepper motor can be used at this time. Stepper motor is a kind of brushless motor, and also needs to be driven. The micro stepping motor is low in price, but the torque is low. Of course, the angle can be controlled accurately. The micro stepping motor is usually used with the reducer because of the low torque. High power step motor price is high.

For Aero models and other motors that require small motors and short time power, we need to use the model motor. The cost of the model motor is very high, mainly because its shell is processed in the yard, and the magnet used is not the ordinary ferrite, but the high price NdFe magnet. As long as no cost is considered, the performance of the ordinary motor plus strong magnet is excellent.


URL of this article:http://www.dongmingmotor.net/news/375.html

Key words:DCmotormanufacturer,micromotormanufacturer,reducermotormanufacturer

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