The stator windings of the reducer motor are mostly three - phase symmetrical star connection, which is very similar to the three - phase asynchronous motor. In order to detect the polarity of the motor rotor, a position sensor is installed in the reduction motor. The driver consists of power electronics and integrated circuits. Its function is to receive the start, stop and braking signals of the deceleration motor, control the start, stop and braking of the deceleration motor; Receive position sensor signal and forward and reverse signal, control the power tube of the inverter bridge to disconnect, and generate continuous torque; Receive speed command and speed feedback signal, control and adjust the speed of reducer motor; Provide protection and display etc.
Since the brushless DC reduction motor is automatically controlled, it does not add another starting winding to the rotor like the heavy duty synchronous motor under variable frequency speed regulation, nor does it produce oscillations and out-of-step when the load is abrupt.
The permanent magnet of small and medium-sized brushless DC motor is mainly reflected in the use of high magnetic energy Ndfeb rare earth product material. Therefore, the volume of rare earth permanent magnet brushless motor is smaller than the capacity of three-phase asynchronous motor by a seat number.
In the past 30 years, the research on variable frequency speed control of asynchronous motor is in the final analysis to find a way to control the torque of asynchronous motor. Rare earth permanent magnet brushless DC deceleration motor has advantages in speed regulation field due to its wide speed regulation, small size, high efficiency and small steady-state speed error.
Brushless DC motor is also known as DC frequency conversion, because it has the characteristics of DC and brush reducer motor, and is also a frequency changing device. The common international term is BLDC. Brushless DC motor operation efficiency, low torque, speed accuracy is better than any control technology, worthy of industry attention.
