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BLDC

  • A brush DC motor through the brush to reverse. Here are some of the key points of the brush DC motor:
    The typical rotor (armature is) on the winding, and at its end connected to a commutator
    The brush is connected with the reversing part and is disconnected, and the energy is transmitted to the armature.



◆ Working principle
Xinnova has a strong, motor control application of the product mix. Running smoothly and high efficiency drives the development of motor control. The development of field oriented control (FOC) software for PMSM, PMAC and induction motor (which uses high performance micro controller, power transistor and high voltage gate driver IC) meets the need of higher efficiency. For low power applications, a new high level integrated controller / driver IC can be used to achieve a smoother operation and higher positioning accuracy.
◆ Brushless DC motor control
These easy drive motors are usually used to achieve speed and position control, and the power is between a few watts and a few horsepower. Only one rotation direction can be achieved with a single transistor PWM speed control. The full H bridge with a PWM control function can be used for locating the application or the need for a 2 rotation direction. In the case of low power level, it can be used to drive the DC motor with a drive and a power transistor, and the full integration of the power IC. For high power applications, the H bridge can be realized by using the MOS or IGBT and the high voltage grid drivers. The speed control algorithm and the control bridge can be realized by using low cost micro controller. A sensor, such as a speed meter or encoder, can accurately control the position or speed. Can be used without feedback loop to achieve a simple speed adjustment.
◆ Brushless DC (three phase BLDC
A permanent magnet is attached to the rotor of the brushless DC motor, and the stator has an external commutation coil. The electronic commutation replaces the function of the brush in the DC motor, and the stator coil is driven by the rotor position. The main advantage of brushless DC motor lies in its high efficiency and high reliability. Because of the urgent need to improve the efficiency of the system, these motors are becoming more common. A typical configuration for the 1 driven by 3 motor three-phase half bridge. In low power applications, the drive can be integrated into the smart power IC. For the application of higher power, discrete IGBT and high voltage gate driver IC can be used in half bridge. For many applications, the sensorless drive eliminates the need for the Holzer effect sensor used in the past. The six step commutation and speed control are realized by using the low end micro controller.