Dc brushless dc motor and ac brushless dc motor manufacturers | | the difference between a brushless dc motor brushless dc motor in the south of anhui

According to the power supply type, brushless dc motor can be divided into dc brushless dc motor and ac brushless dc motor, the current brushless dc motor, brushless dc motor in southern anhui province will introduce simple dc brushless dc motor and ac brushless dc motor and the difference between the two: dc brushless dc motor and its principle of work: dc brushless dc motor is can can realize direct current (dc) and mechanical energy conversion brushless dc motor, when run it as a motor is a dc motor, converts electrical energy into mechanical energy. As a human hair is a dc brushless dc during brushless dc motor, converts mechanical energy to electrical energy. Working principle of the dc of brushless dc motor is the armature coils of alternating emf induction, the commutator with brush commutation function, make it from the brush end into the principle of dc electromotive force. Working principle of the dc dc brushless dc motor fixed inside a circular permanent magnet brushless dc motor, the current through the coil produces ampere force on the rotor, when the rotor coil and magnetic fields on the parallel, turn again by the magnetic field direction will change, so the rotor at the end of the brush to convert alternating contact, and the direction of the electric current on the coil is changing, the direction of the lorentz force is constant, so the function of brushless direct current (dc) keep a direction. Working principle of the dc of brushless dc motor is the armature coils of alternating emf induction, the commutator with brush commutation function, make it from the brush end into the principle of dc electromotive force. The direction of induction electromotive force according to the right-hand rule to determine ( Magnetic induction line point to palm, thumb conductor movement direction, the other four refers to the point to is the direction of induction electromotive force in the conductor) 。 With the left hand rule to determine the conductor stress direction. This a pair of electromagnetic force applied to the armature formed a torque, the torque in the rotating brushless dc motor is called electromagnetic torque, torque direction is counterclockwise, trying to make the armature counterclockwise rotation. If the electromagnetic torque can overcome the armature resistance torque ( For example, caused by friction resistance torque and other load torque) The armature can spin counterclockwise direction. Ac brushless dc motor, ac brushless dc motor is used to implement the mechanical energy and electrical energy transformation of mechanical communication. Owing to the great development of ac electric power system, ac brushless dc motor has become the most commonly used brushless dc motor. Ac brushless dc motor and the dc brushless dc motor, compared with no commutator, so simple structure, easy fabrication, quite strong, easy to make a high speed, high voltage, high current, large capacity of brushless dc motor. Ac brushless dc motor's power range is very large, from a few watts to hundreds of thousands of kilowatts, or even millions of kw. Dc brushless dc motor and ac brushless dc motor difference: 1, the speed is proportional to the voltage of brushless dc motor is dc brushless dc motor, the speed and frequency is proportional to the brushless dc motor is ac brushless dc motor. 2, dc brushless dc motor is by coil commutation, and ac brushless dc motor is extremely group phase commutation. 3, dc brushless dc motor is regulating speed regulation, and ac brushless dc motor is frequency control of motor speed, this is a dc brushless dc motor and ac brushless dc motor of the watershed. 4, dc brushless dc motor and ac brushless dc motor is the fundamental difference between electric potential balance equation is different: 1) Balance equation of electric potential, dc brushless dc motor is: U = C Φ n2) Balance equation of electric potential, ac brushless dc motor is: U = C Φ f3) , dc brushless dc motor with rapid response, large starting torque, rotating speed of from zero to rated speed can provide the rated torque performance, but the advantages of dc brushless dc motor is also its drawback, because dc brushless dc machine to produce a constant torque under the rated load performance, the armature magnetic field and rotor magnetic field must be constant to maintain 90 & deg; This is about to borrow from the carbon brush and commutator. Carbon brush and commutator in brushless dc motor rotation would produce sparks, carbon powder, so besides can cause damage of components, its usage is restricted. Ac brushless dc motor without carbon brush and commutator, free maintenance, strong, wide application, but if characteristics to achieve equivalent to the performance of the dc brushless dc motor must use complex control technology to achieve. Three-phase asynchronous motor has simple structure, reliable operation, low cost, etc.