In any mechanical and electrical motion control system, the motor performance is critical. Brushless dc motor (刷)First developed in the 1960 s, because of its unique advantages, and almost from the beginning of the 19th century has already begun to replace the traditional brush motor (Note: I wasn't referring to brushless dc motor can replace all of the brushless dc motor)。
basic knowledge of brushless dc motor
electric toothbrush BLDC motor
does and traditional compared with brushless dc motor, brushless dc motors have higher efficiency, effectively reduce the mechanical wear, long service life and higher resistance to electromagnetic interference and high reliability.
in terms of performance, users can expect a higher speed and torque, high speed of dynamic response and greater range. For these reasons, brushless dc motor is spread rapidly in many industries, including aerospace, medical equipment, automation, etc.
is synchronous brushless dc motor (BLDCM), the magnetic field generated by the rotor and stator rotating at the same frequency. This helps to prevent the skid phenomenon observed in many high induction motor. In spite of single phase and two phase and three-phase motor, but the three-phase design is the most popular in today's applications.
does the stator: in brushless dc motor, the stator consists of laminated steel sheet. Winding is located along the inside of the axial cutting groove. In general, a bit like a induction motor stator, but the distribution of the winding is different. Using multiple connected each winding coil. The winding exists to optimize reverse electromagnetic force;
does the rotor, the rotor is composed of permanent magnet, there may be anywhere between 2 to 8 to help change the magnetic field density. Usually use cheap ferrite magnets, but due to its high magnetic flux density, rare earth permanent magnet is considered to be the ideal. Size weight ratio and higher torque also boosted alloy magnets used;
does hall sensor, the sensor requires its own power, to monitor the motor rotor position is very important. Due to the commutation of brushless dc motor (BLDCM) is dependent on in a given order to the stator winding electricity, so only when the rotor position tracking can maximize the performance.
when using brushless dc motor can be accurately optimization, get higher rates of output and better performance characteristics. Professional knowledge and tools is really a necessary condition for release of brushless dc design potential. brushless motor
