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8.05.12 06:13
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In the Park
When I was in the park, I found a clear chair and then sat down. I had always been thinking that life was so changeable; I stayed with my husband yesterday and then today he vanished into the thin air. It was really incredible. I felt I was dreaming, but it was not. I pinched myself and could still pain. I heard a noise of a Novak brushless motor when I was sitting on the chair thinking the question, because there were very few people in the park and it was so quiet at that moment, so I could hear every small noise. I raised my head and I could not believe my eyes. The man riding the electric bike should have had been my husband! It was unbelievable. But behind his back, I saw a woman, who was more beautiful and younger than me, and in his eyes, he could completely abandon me according to those two points. I knew it very clearly. He stopped the motorized bicycle and greeted me. He was pale on his face and there was a little shiver in his voice.
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The performance comparison of ac motor and dc motor
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.
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The meaning of Brushless motor to improve fan efficiency
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.
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The limited factors to affect the progress of brushless motor
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.
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The energy efficiency of air condition
Although when the compressor and heat exchanger is confirmed, the general level of energy-saving air-conditioning has been confirmed, but there are air conditioning manufacturers, said air duct motor like we usually call "the last straw breaks the camel." If you tried every means, the air conditioning system efficiency value reached 3.59; in this case, if wind motor single induction motor replaced by brushless DC motor, the value of energy efficiency could reach 3.61, thus, air condition will reach a new level of energy efficiency standards. Therefore, in the current technology to fight to a certain extent, wind tunnel technology to change the motor direction to be the most crucial part. So use brushless motor to manufacturing the fan is the trends of era.
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My Father and My Son
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.
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After Signing the Divorce Agreement
My ex-husband sent me the divorce agreement several days later; I signed my name on the agreement and I was single from then on. I had no job and no husband within several months. Things had changed so rapidly and I felt very sad. The first time I thought of was to go to the bar and drink beer to drown all my sorrows. I went on my motorized bicycle and went the nearest bar. I drank one bottle of beer after another and after a long time, I heard a voice saying that they were going to close the door I paid for the beer and went out of the bar. I had been drunk, but I could still remember my mamba brushless motor electric car and wanted to ride it home. I felt a little dizzy and could not see things very clearly in front of me. The guard saw me being unable to stand steadily and asked me to take a taxi home instead of riding the electric power bike and he would help me looking after the electric car. I followed his advises and stood by the roadside waiting for a taxi.
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