The structure and advantages of brushless dc motor

by:Hoprio     2020-07-24
Brushless dc motor:

brushless dc motor is composed of main body of the motor and drive, is a typical mechatronics product. Because of the brushless dc motor based on automatic control type of operation, so don't like frequency control of motor speed synchronous motor overload start under plus startup winding on the rotor, also won't generate oscillation and step out when load mutation. Medium and small capacity of the permanent magnet brushless dc motor (BLDCM), now many high rare earth ndfeb magnetic energy product ( Nd- Fe- B) Materials. As a result, the volume of rare earth permanent magnet brushless motor than three-phase asynchronous motor with capacity reduces a frame number.

brushless motor structure analytic:


structure, brushless motor and a brush is similar, also have the rotor and stator, but contrary to a brush motor structure; With brush motor rotor winding, and the power output shaft is linked together, the stator is permanent magnet steel; Brushless motor rotor is a permanent magnet steel, along with shell and output axis is linked together, the stator is winding coil, to remove a brush motor commutator brush to alternating electromagnetic field, so called brushless motor ( 无刷电机) , that have a problem now, did not have the electromagnetic field transformation, how to make the brushless motor rotation?

the advantages of brushless motor:

1. Low noise, smooth operation


brushless motor without brush, less friction force during operation, smooth operation, low noise will be many, the advantages of model running stability is a huge support.

2. No brush, low interference


in addition to the brushless motor brush, the most immediate change is without the motor running when the electric spark, thus greatly reduce the electric spark interference of remote radio equipment.

3. Low maintenance cost, long life


little brush, brushless motor wear is mainly on the bearing, from the mechanical point of view, brushless motor is almost a maintenance-free motor, when necessary, the only need to do some cleaning maintenance. Next comparison, know brushless motor relative to have advantage in where the brush motor, but everything is not absolute, a brush motor torque at low speed performance, large torque and other performance characteristics is irreplaceable brushless motor, but in the context of use and ease of brushless motor, with the decline in the cost of brushless controller and brushless technology development and market competition both at home and abroad, brushless power system is the development and popularity of high-speed stage, it also greatly promote the development of the model of motion.
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