The difference between brushless dc motor and plain dc motor, where is its advantage
Brushless dc motor and brushless dc motor is the difference between ordinary is as follows: 1, the brushless dc motor with integrated drive circuit commutation, ordinary brushless dc motor with brush and commutator with the reversing, keep the continuous rotation of the motors. The winding of brushless dc motor is the stator, the magnet is the rotor, and the common windings are the rotor, the electromagnet is the stator. The non-brush dc motor USES rare earth permanent magnet (nd-ti-boron permanent magnet) to achieve greater power and efficiency, and ordinary brush dc motor USES ferrite permanent magnet. The non-brushless dc motor is usually multi-groove, 6 slots, 9 slots, 12 slots, 24 slots, etc., the average brush dc motor has fewer slots, 3 slots, 5 slots, 7 slots etc. The company has shenzhen constant drive motor co., LTD.
Brushless dc motor consists of motor subject and drive, which is a typical electromechanical integrated product. The stator winding of the motor is a three-phase symmetric star connection, which is similar to the three-phase asynchronous motor. The rotor of the motor is attached to the magnetized permanent magnet, which detects the polarity of the motor rotor and has a position sensor in the motor. Drive consists of power electronic devices and integrated circuit, its function is: accept the motor start, stop, brake signal, to control the motor start, stop, and the brake; To accept the signal of position sensor and the positive and reverse signal to control the flow of the power pipe of the inverter bridge to produce continuous torque. Accept the speed and speed feedback signals to control and adjust the speed. Provide protection and display, etc. Because of brushless dc motor based on self-control type 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.
Two contrast ordinary, brushless dc motor has the advantage of the brushless dc motor: 1, brushless dc motors have higher efficiency and efficiency can be as high as more than 70%, significantly higher than the ordinary brushless dc motor are the efficiency of about 40%. The life of dc brushless motor can be up to 10,000 hours, whereas the average brush dc motor has a life span of less than 1000 hours. The noise of the dc brushless motor and the electromagnetic interference are very small, and the noise and electromagnetic interference of the common brush dc motor are very large. 4, brushless dc motor can be precise control, customer variable voltage and variable frequency control, the integrated drive circuit boards of hall element position signal output, brushless motor can use this position signal for precise control, precision as stepper motor, and much more life and high efficiency.
If the simplest commutation circuit is taken, there is no difference between controlling and dc motors. The difference is that there is no such thing as a brush In other words, replace the commutation with electric electronics Other advantages are due to the absence of brushes
