The effect of waterproof cooling fan, and history

"Magnetic Tile For Motor" development is based on a permanent magnet motor itself needs change."Magnetic Tile For Motor" is divided into permanent magnet DC motor with permanent magnet AC motor. Permanent magnet AC motor refers multiphase synchronous motor with a permanent magnet rotor, previously mainly aluminum, nickel and cobalt ferrite magnetic tile, with power increasingly demanding, aluminum, nickel and cobalt ferrite with low because of BH not meet the requirements, now NdFeB magnetic tile in the field of high-power synchronous motors and generators very wide application. Of course NdFeB magnetic tile, precious because rare earth resources, raw materials prices rise exponentially, its manufacturing costs and production prices will continue to increase, affecting its extensive use in some low areas. NdFeB itself a negative temperature coefficient, low Curie temperature, but also limits its high temperature applications should be transported. Permanent magnet brush less DC motor and is divided into ordinary DC motor with commutator, from the shape, the number of poles of the magnet to determine its application in the ordinary DC motors with 2 and 4-pole majority, and the magnetic tile substantially used as a stator, most miniature DC motor using ferrite magnetic tile, mainly used in toys, appliances, automotive sector. "Magnetic Tile For Motor" as a stator, generally more than 6-pole, so the central angle is much smaller than the magnetic tile with ordinary DC motors. But as the brush less motor magnetic tile rotor poles may have 4,6 or more, for 4-pole, the outer surface of the rotor is magnetized, and makes up a round due to its central angle approaching 90°, this it can be distinguished from ordinary DC motors. Magnetic tile according to different application areas, as well as the performance of the magnetic field waveform requirements are also different, as the rotor field, outer arc table field requirements, the basic requirements for the sine waveform, as a stator, then according to the requirements of the motor output, sparks and noise Choose different requirements, as the stator magnetic tile, its inner arc table games is high, due to the shape of the magnetic tile production characteristics of the decision itself, which is mainly saddle-shaped waveform, such large output waveform, but the spark noise, no-load current is large. To improve noise and vibration, commutation spark, reduce load current, the magnet shape and size, mold design, etc. should be carefully designed, ranging from thick magnetic tile, etc. which have been widely used, the principle is the inner magnetic tile arc gap field waveform tends topped waves.