Brushless dc motor in the supply of brushless dc motor for the characteristics of a dc motor is also the device of frequency variation, so also known as the dc inverter, international general nouns denote for BLDC. MotorsBrushless dc motor is relative to brush it. With brush motor rotor winding, and the power output shaft is linked together, the stator is permanent magnet steel; Brushless dc motor rotor is a permanent magnet steel, along with shell and output axis is linked together, the stator is winding coil, to remove a brush motor commutator brush to alternating electromagnetic field, and so called brushless motor.
every use of position sensor brushless dc motor friends will not be unfamiliar. So what is the role position sensor? The principle of how again? By below small make up for your explanation:
position sensor in brushless dc motor plays a role that can locate the position of the rotor magnetic pole, to provide the correct logical switch circuit in the phase information, the rotor magnetic pole position signal into electrical signal, and then to control the phase of the stator winding. Position sensor sort is more, and each has its characteristics. The brushless dc motor position sensor has the following three kinds of commonly used, respectively is the magnetic position sensor, magnetic susceptibility location proximity sensors, photoelectric position sensor.
（1)Electromagnetic position sensor in brushless dc motor, use morer is open the transformer. Used for three-phase brushless dc motor tracking open transformer by the stator and rotor of two parts. Stator generally there are six pole, the interval between them is 60 degrees respectively, three of them in a winding around, and in series with high frequency power supply, after another three pole respectively on secondary winding around the WA, WB, WC.
（2)Magnetic susceptibility type position sensor is to point to some of its electrical parameters change with the surrounding magnetic field according to certain rule semiconductor sensitive elements. The basic principle of hall effect and the magnetic resistance effect. Common magnetic sensor with hall element or hall integrated circuit, magnetic sensitive resistor and magnetic susceptibility diode, etc.
（3)Photoelectric position sensor is made use of the photoelectric effect, by to accompany the motor rotor rotating bezel and stationary sources, photocell parts, etc.
the motor, brushless dc motor is comprehensive, microelectronics, control and computer technology in one high-tech product. Brushless motor in the medical, industrial control, automotive electronics and consumer electronics and other high precision control industries widely used. With the development of power electronics and the emergence of new permanent magnet materials, the development of brushless dc motor is bound to more rapidly. Combined with position sensor detecting motor rotor polarity anytime and anywhere, is more advantageous to fully use and maintenance of the brushless dc motor. Committed to research and development costs are lower, simple installation, signal processing better brushless motor and position sensor products.
