motorxxoo

because of its solid structure, operation stable and reliable, low cost and high efficiency， AC induction motor have been widely used. AC motor controls not as good as DC motor, and in many applications there are precise positioning, torque control, speed control requirements. To achieve this functionality and improve the control precision, we need a more complex closed loop control system and effective control algorithm, the complex control algorithm contains a large amount of data and systems, and there are demanding computing power and speed of the microprocessor.
Formerly, AC motor control they use single chip 8031, 8051 and so on, the circuit components is more, the hardware is complex, system operation reliability is bad and the flexibility is small. the emergence of Digital signal processor (DSP) makes the implementation of modular motor control system become possible.

As to the traditional fixed-frequency air-conditioning, there are several key aspects to improving energy efficiency, the first is the efficiency of the compressor, Currently, the traditional fixed-frequency air-conditioning in the domestic market still has some vitality. The second one is the energy efficiency of heat exchangers. A heat exchanger is in indoor side (also known as the evaporator), another one in the room outside (also known as the condenser.) Two heat exchanger and compressor matching, both of them will affect the energy efficiency of air conditioning.
In addition to the above two areas, in recent years, to improve the efficiency of air duct of the fan brush motor has become a key component of companies concerned. In fact, the air conditioning compressor also has motor inside. However, the traditional performance improvement of the compressor motor has not much meaning to improve energy efficiency improvements. But the air duct of the motor situation is different. Traditional wind tunnel motor is single phase induction motor; this motor efficiency was in about 40%, but if you use brushless DC motors, motor efficiency can reach above 75%. Therefore, the air duct portion of the motor to improve power consumption can be saved.

Although the brushless motor will improve the efficiency of air condition, but there still has some difficulties for domestic manufacturers to the research and develop brushless motor. Especially after the development of the enterprise, it will add more difficult for air-conditioning producers, thus, while the air conditioning manufacturers have been put into research and development in this area, but also have to end with a period of time. The second limited factor is the cost, Although the price difference between different specifications brushless DC motor and traditional AC motor is different, but general speaking, The cost of brushless DC motor is twice as traditional AC motor, some even more than doubled.

Since I gave birth to my little baby, my father was too obsessed to go to look at and play with him in my house every day. He asked my brother to give a birth to a baby, but he would say that he and his wife had been busying with their careers in the brushless electric motors and the garden and did not want to have a baby yet every time when my parents prompted him and his wife to give birth to a baby. They got very angry, especially my father, who was an old antique, even wanted to break off with my brother. So he would ride his power e bike and went to my house to coax him every day. He always stayed at my home till very late at night no matter how I asked him to go back home. My husband got angry one night and asked me to call my mother to ask her to take my father home. My mother rode her motorized bike and arrived at my home twenty minutes later and scolded my father and then asked his go home with her. it was the first time that I saw a person liked a baby so much.