Direct current motor and ac motor, which is large, good, who invented
As with the above, each has its own purpose, just like your hands and feet. Which one do you say is more useful?
The auster motor USES the principle of the magnetic effect of the current, and the principle is invented by the Danish physicist oster. He was born on August 14, 1777, in a family of pharmacists in rudjoin, langlang island. He was admitted to the university of Copenhagen in 1794 and a doctorate in 1799. He visited Germany and France in 1801-1803 and met many physicists and chemists. He was a professor of physics at the university of Copenhagen in 1806 and became executive secretary of the Danish royal society since 1815. In 1820, the royal society received the royal society award for the remarkable discovery of the magnetoelectric effect. In 1829, he was President of the Copenhagen institute of technology. He died in Copenhagen on March 9, 1851. He has studied physics, chemistry and philosophy too much. Due to the influence of Kant's philosophy and the natural philosophy of schelling, it is believed that natural forces can be transformed from one another, and the relationship between electricity and magnetism has been explored for a long time. In April 1820, the effect of the current on a magnetic needle, the magnetic effect of the current, was finally discovered. On July 21, the same year, he published his findings on the subject of an experiment on electroconflict in magnetic needles. This short paper to make Europe has had the enormous vibration physics, led to the emergence of a large number of experimental results, which has opened up a new field of physics ─ ─ electromagnetism. In 1934, the unit of strength of the magnetic field was named after "oster". In 1937 the American association of physics teachers set up the oster medal to reward physics teachers who contributed to physical teaching.
Hey hey I just start motor learning is easy to control dc motor speed control performance is very good But relative to the ac motor complex high cost is a bit poor reliability Also involves the reversing of ac motor does not have But with power electronic device with a lot of motor Such use dc motor place less university teaching soup aggregates Qiu motor learning Gu Shenggu electric drag on
The advantages and disadvantages of dc motor and ac motor Dc motor has a rapid response, large starting torque, rotating speed of from zero to rated speed can provide the rated torque performance, but the advantages of dc motor is also its drawback, because the direct current machine to produce a constant torque under the rated load performance, the armature magnetic field and rotor magnetic field must be constant to maintain 90 °, this is about to borrow from the carbon brush and commutator. The carbon brush and the commutator produce sparks and carbon powder when the motor is rotated, so there is a limit to the use of the place, except for the damage of the component. Ac motor without carbon brush and commutator, free maintenance, strong, wide application, but if you want to achieve the equivalent of dc motor according to the characteristic performance must use complex control technology to achieve. The ac motor is divided into asynchronous motors and synchronous motors. The asynchronous motor is divided into single phase asynchronous motor, two-phase asynchronous motor and three-phase asynchronous motor according to the number of stator phases. Three-phase asynchronous motor structure is simple, reliable and low cost.
