Brushless motor and brush motor

Brushless dc motor is composed of main body of the motor and drive, is a typical mechatronics product. 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, 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;ac motor electric 65kw 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. 

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 volume, high efficiency and steady speed 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. 1, fully replace the dc motor speed control, comprehensive alternative, comprehensive alternative to asynchronous motor frequency converter + frequency conversion motor + reducer speed; 2, can run for high power at low speed, can save the reducer direct drive big load; www.dongfeng-motor.com 3, have all the advantages of traditional dc motor, and cancelled the carbon brush and slip ring structure; 4, torque characteristic is excellent, medium and low speed torque performance is good, big start torque, small starting current; 5, stepless speed regulation, wide speed range, strong overload capacity; 6, small volume, light weight, large output; 7, soft and soft stop, good braking performance, saves the original mechanical braking or electromagnetic braking device; 8, high efficiency, no excitation loss and carbon brush motor itself loss, eliminate the multiple reduction consumption, comprehensive energy-saving rate can reach 20% ~ 60%, power saving a year only recover the purchase cost; 9, high reliability, good stability and strong adaptability, simple maintenance and maintenance; 10, turbulence shock resistance, low noise, little vibration, smooth operation, long service life; 

11, no radio interference, does not produce sparks, especially asynchronous motor suitable for explosive place, explosion-proof type; 12, according to the needs of optional trapezoidal wave motor and is XuanBo magnetic field magnetic field. Matters needing attention (1) before disassembly, with compressed air blowing off the motor surface dust, and wipe the surface dirt thoroughly. (2) choose the disintegration of the motor working place, clean up the scene environment. (3) familiar with the motor structure characteristics and maintenance technical requirements. (4) ready to collapse the required tools and equipment (including special tools). (5) in order to further understand the defects of the motor running, conditional can before disassembly when doing an inspection test. For this, turn motor with load test, the detailed check parts, such as temperature, sound, vibration motor, and test the voltage, current, speed, etc., and then disconnect the load, do a no-load check test, no-load loss and no-load current is measured and recorded. (6) to cut off the power supply, dismantling motor wiring, recorded. (7) the appropriate voltage test motor insulation resistance by megger are. Maintenance in order to keep pace with The Times when measured insulation resistance compared to determine the motor insulation change trend and insulating state, should be measured under different temperature insulation resistance value of the conversion to the same temperature, the average conversion to 75 ℃. Absorb than K (8) test. When the absorption ratio greater than 1.33, which indicates that the motor insulation or degree of be affected with damp be affected with damp be affected with damp be affected with damp or not serious. In order to compare with previous data, also want to add any temperature measured absorption than the conversion to the same temperature.