Advertising light boxes brushless DC motor and drive by the motor body composition, is a typical mechatronic products. nidec motor stator windings made more symmetrical three-phase star connection with three-phase asynchronous motors are very similar. The rotor of the motor is magnetized sticky permanent magnet, in order to detect the polarity of the motor rotor, the motor built in a position sensor. Drive by the power electronic devices and integrated circuits, etc., and its function is to: Accept to start the motor, stop, brake signal to control the motor start, stop, and brake; accept the position sensor signal and reversing signal for controlling the inverse variable bridge each power tube off, resulting in continuous torque; accepted speed command and speed feedback signal is used to control and adjust the speed; provide protection and display, and so on.
　　Because of brushless DC motor based on self-control operation, it is not as heavy-duty down-conversion speed synchronous motor starts as an additional start winding on the rotor, it does not produce oscillations and out of step when the load mutation. Permanent magnet brushless DC motor small volume, and now use more high-energy product rare earth neodymium iron boron (Nd-Fe-B) material. Thus, the volume of rare earth permanent magnet brushless motor capacity than the same three-phase asynchronous motors with a narrow frame size. For nearly three decades of research asynchronous motor frequency control, in the final analysis is looking at ways to control asynchronous motor torque, rare earth permanent magnet brushless DC motor is bound to its wide speed, brushless DC motor small size, high efficiency and steady-state speed error characteristics of small areas of apparent advantage in speed.
　　Brushless DC motor as a DC brush motor characteristics, but also the frequency variation means, they are called the DC inverter, international general term for BLDC. The operation efficiency of the brushless DC motor, the low speed torque, speed accuracy than any inverter control technology even better, so it's worth to the industry. this product has been produced more than 55kW, can be designed to 400kW, can solve the energy-saving and high-performance drive industry demand. A comprehensive alternative to the DC motor speed control, a comprehensive alternative to the inverter + inverter motor control, a comprehensive alternative to the asynchronous motor speed reducer; 2, you can run low-power, direct drive gear can save a large load; 3, All the advantages of a traditional DC motor, but canceled the brushes, slip ring structure; 4, excellent torque characteristics, medium and low-speed torque performance, starting torque, low starting current; 5, variable speed, wide speed range, strong overload capacity; 6, small size, light weight, large output; 7, a good soft start soft stop, braking characteristics, can save the original mechanical brake or electromagnetic brakes; 8, efficiency high, motor and brushless excitation loss itself is not loss, eliminating multi-stage reduction consumption, comprehensive energy-saving rate of 20% to 60%, only one-year energy-saving recoverable acquisition costs; 9, high reliability, stability good, strong adaptability, repair and maintenance is simple; 10 resistance bumps vibration, low noise, servo motor vibration, smooth operation and long life; 11, no radio interference, no spark, especially for explosive places with explosion-proof ; 12. Requires optional trapezoidal wave and sine wave motor magnetic field motor