Brushless dc motor (BLDCM) is in a brush dc motor on the basis of development, but its drive current is a standard form of communication; Brushless dc motor and can be divided into rate of brushless motors and brushless torque motor. Generally, there are two kinds of brushless motor drive current, one kind is trapezoidal wave (usually "square"), the other is a sine wave. Sometimes called before a brushless dc motor, the latter is called ac servo motor,www.dongfeng-motor.com
exactly is a kind of ac servo motor. General electrical engineer brushless dc motor in order to reduce the moment of inertia, usually adopts the structure of "thin". Brushless dc motor on the weight and volume than a much smaller brush dc motor, the corresponding moment of inertia can be reduced by 40% - 50%. Because of the permanent magnetic material processing problems, the brushless dc motor general capacity are below 100 kw. That the mechanical properties of the motor and regulating characteristics of good linearity, wide speed range, long service life, convenient maintenance noise small, does not exist a series of problems caused by brush, so this kind of motor in the control system has great application potential. The stator winding of the motor to make more balanced three-phase y connection, with three phase asynchronous motor is very similar. On the rotor of the motor with the magnetization of the permanent magnet has, in order to detect the polarity of the motor rotor, inside the motor is equipped with position sensor.
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,www.facebook.com/guohong.trading
and the brake; Accept the position sensor signals and positive &negative, used to control the inverter bridge on and off of each power tube produce continuous torque; Accept the speed instruction and speed feedback signal, which is used to control and adjust the speed; To provide protection and display, and so on. 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. Medium and small capacity of the permanent magnet brushless dc motor (BLDCM), now more than using high magnetic energy product of rare earth ndfeb material (Nd - Fe - B). As a result, the volume of rare earth permanent magnet brushless motor than three-phase asynchronous motor with capacity reduces a frame number. General electrical engineer pointed out that nearly 30 years study of asynchronous motor frequency control of motor speed, in the final analysis is looking for a way to control the asynchronous motor torque, rare earth permanent magnet brushless dc motor is bound to its wide speed range, small motor fan volume, high efficiency and steady speed water pump and small error characteristics appeared in the field of speed advantage. For brushless dc motor has the characteristics of a dc motor, is also the device of frequency variation, so also known as dc frequency conversion, the international general term for BLDC) motors running efficiency of the brushless dc motor, torque at low speed, precision of speed is more good than any of the control technology of inverter, so the industry concern. This product has production more than 55 kw, can design to 400 kw, can meet the requirements of industry energy saving and high performance drive.
and the brake; Accept the position sensor signals and positive &negative, used to control the inverter bridge on and off of each power tube produce continuous torque; Accept the speed instruction and speed feedback signal, which is used to control and adjust the speed; To provide protection and display, and so on. 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. Medium and small capacity of the permanent magnet brushless dc motor (BLDCM), now more than using high magnetic energy product of rare earth ndfeb material (Nd - Fe - B). As a result, the volume of rare earth permanent magnet brushless motor than three-phase asynchronous motor with capacity reduces a frame number. General electrical engineer pointed out that nearly 30 years study of asynchronous motor frequency control of motor speed, in the final analysis is looking for a way to control the asynchronous motor torque, rare earth permanent magnet brushless dc motor is bound to its wide speed range, small motor fan volume, high efficiency and steady speed water pump and small error characteristics appeared in the field of speed advantage. For brushless dc motor has the characteristics of a dc motor, is also the device of frequency variation, so also known as dc frequency conversion, the international general term for BLDC) motors running efficiency of the brushless dc motor, torque at low speed, precision of speed is more good than any of the control technology of inverter, so the industry concern. This product has production more than 55 kw, can design to 400 kw, can meet the requirements of industry energy saving and high performance drive.
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