Brushless motor and characteristics

　　What is a brushless motor?

　　Brushless DC motor and drive by the motor body composition, is a typical mechatronic products. Brushless motor means no brushes and commutator (or collector ring) motors, also known as non-commutator motors. Early in the century, when the birth of the motor, practical brushless motor is generated form, ie, AC squirrel cage induction motor, the motor has been widely used. However, the induction motor can not overcome many shortcomings, so that the slow development of motor technology. The mid-century was born transistor, which uses a transistor commutation circuit instead of brush and brushless DC motor commutator came into being. The new electronically commutated brushless motor called DC motor, which overcomes the shortcomings of the first generation of brushless motor.

　　Features brushless motor

　　1, to replace the DC motor speed control, inverter + inverter motor control, induction motor speed reducer;

　　2, with the advantages of traditional DC motor, but canceled the brushes, slip ring structure;

　　3, with brake, double steering function;

　　4, small size, light weight, large output;

　　5, excellent torque characteristics, medium and low-speed torque performance, starting torque, low starting current;

　　6, variable speed, wide speed range, strong overload capacity;

　　7, soft start, soft stop, braking characteristics, can save the original mechanical brake or electromagnetic brake;

　　8, high efficiency motors and brushless excitation loss itself is not loss, eliminating the multi-stage reduction loss, comprehensive energy-saving rate of 20% to 60%.

　　9, high reliability, good stability, adaptability, repair and maintenance is simple;

　　10, anti-bump vibration, low noise, low vibration, smooth operation and long life;

　　11, does not produce sparks, especially for explosive places with explosion-proof;

　　12. Requires optional trapezoidal wave sinusoidal magnetic field motor and motor.

　　Advantages of brushless motors

　　Different from brushed DC motors, brushless DC motors do not use brushes mechanical device, using square-wave controlled permanent magnet synchronous motors with Hall sensors replace commutator brushes to NdFeB permanent magnet materials as the rotor , compared to conventional DC motors generally have great advantages in performance, is the ideal speed motor. Its advantages: cooling fan

　　High efficiency, low energy consumption, low noise, long life, high reliability, servo control, stepless speed, relatively low cost and easy to use.

　　Brushless DC motor made more symmetrical three-phase stator winding 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 with 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.

　　Brushless DC motors are widely used in household appliances, automotive parts, power tools, office automation, industrial and commercial equipment, medical equipment, personal care, robotics and many other industries.