Brushless dc motor of the machine itself is electromechanical energy conversion part, it besides motor armature, permanent magnet excitation two points, also with sensors. Motor itself is the core of the brushless dc motor, it is not only related to the performance index, noise, vibration, reliability and service life, etc. , involving the manufacturing costs and product cost. Because use permanent magnet magnetic field, make the brushless dc motor from the traditional design and structure of the dc motor commonly, meet the requirements of various applications market, and development in the direction of the province copper material saving, simple and convenient manufacturing. Permanent magnet magnetic field is closely related to the development and application of permanent magnetic material, and the third generation of the application of permanent magnetic material, make brushless dc motor to efficiency, miniaturization, energy-saving direction.
brushless dc motor is a kind of synchronous motor, that is to say, the motor rotor speed of the motor speed rotating magnetic field of the stator and rotor pole (p)Effect: n = 120. f / p。 In case the number of rotor fixed, change the frequency of the stator rotating magnetic field can change the speed of the rotor. Brushless dc motor is a synchronous motor with electronic control (Drive), control the frequency of the stator rotating magnetic field and the motor rotor speed feedback to the control center of repeated correction, in order to achieve close to the way the characteristics of dc motor. That is to say, brushless dc motor can be within the rated load when the load changes can still maintain control motor rotor speed.
