DC brushless motor is composed of motor body and driver, which is a typical electromechanical integration product. Brushless Motor refers to brush-free and commutator (Or collector ring)The motor, also known as commutator-free motor.
As early as the 19th, when the motor was born, the practical motor was brushless, that is, ac squirrel cage asynchronous motor, which was widely used.
However, asynchronous motors have many insurmountable defects, resulting in slow development of motor technology.
The transistor was born in the middle of last century, so the DC brushless motor, which uses transistor commutation circuit instead of brush and commutator, came into being.
This new type of brushless motor is called electronic commutation DC motor, which overcomes the defects of the first generation of brushless motor.
Brushless DC Motor is composed of motor body and driver, which is a typical electromechanical integration product.
The stator winding of the motor is mostly made into a three-phase symmetrical star connection, which is very similar to a three-phase asynchronous motor.
The rotor of the motor is sticked with magnetized permanent magnets. In order to detect the polarity of the motor rotor, a position sensor is installed in the motor.
The driver is composed of power electronic devices and integrated circuits. Its function is to receive the starting, stopping and braking signals of the motor to control the starting, stopping and braking of the motor;
Receiving position sensor signals and forward and reverse signals, it is used to control the on-off of each power tube of the inverter bridge to generate continuous torque;
Accept speed instructions and speed feedback signals to control and adjust the speed; Provide protection and display, etc.
DC motor has fast response, large starting torque, and can provide rated torque from zero speed to rated speed. However, the advantage of DC motor is its disadvantage, because the DC motor has to produce a constant torque performance under rated load, the armature magnetic field and the rotor magnetic field must be maintained at a constant of 90 degrees. This is due to carbon brushes and commutators.
Carbon brushes and commutators will produce sparks and Toner when the motor rotates, so in addition to causing damage to the components, the use occasions are also limited.
AC motor has no carbon brush and commutator, is maintenance-free, firm and widely used, but complex control technology is required to achieve the performance equivalent to DC motor.
Nowadays, semiconductors are developing rapidly. The switching frequency of power components is much faster, which improves the performance of drive motors.
The speed of microprocessor is also faster and faster, which can realize the control of AC motor in a rotating two-axis rectangular coordinate system and properly control the current component of AC motor in the two axes, achieve similar DC motor control and have the same performance as DC motor.
In addition, many microprocessors have made the necessary functions to control the motor in chips, and the volume is getting smaller and smaller; Like an analog/digital converter (analog-to-
digital converter, adc)Pulse width modulation (
pulse wide modulator, pwm). . . Wait.
DC brushless motor is an application that controls the commutation of AC motor electronically and obtains similar characteristics of DC motor without Lack of DC motor mechanism.
With the continuous improvement of domestic living standards, cordless vacuum cleaners are gradually entering the homes of ordinary people and are gradually being accepted by more people, in some countries in Europe and the United States, the probability of choosing a cordless vacuum cleaner has reached 85%, and the cordless vacuum cleaner will become a necessary cleaning appliance for every family like White household appliances in the near future, not just'Labor tools'The category.
The cordless vacuum cleaner uses a DC brushless motor.
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Tag dc, DC brushless motor, motor, brushless DC motor