Magnet manufacturer of rare earth permanent magnets, high reliability, easy heat dissipation, high intrinsic coercive force
Rare earth permanent magnets manufacturer of high reliability, easy heat dissipation, high intrinsic coercive force is suitable for high speed running.
The higher the speed, the motor can do the smaller volume weight.
But because of the limitation of mechanical commutator brush dc motor speed is difficult to further improve based on the current.
Brushless dc motor under the condition of bearing allows, speed can be doubled.
Rare earth permanent magnets has high reliability.
High-altitude commutation cremation increase, affect the reliability and electromagnetic compatibility;
Upper air brush wear, carbon powder insulation performance, reducing the life of motor.
Brushless dc motor is not these problems.
Rare earth permanent magnets heat easily.
Brushless dc motor of the major heat source on the stator, natural cooling condition is good.
At the same time can easily in the stator housing for oil cooling or water cooling, especially following oil or oil spray cooling can greatly improve the power density of the machine.
For the brush dc motor is very dangerous.
Rare earth permanent magnets manufacturer redundance control is convenient.
The reliability of brushless dc motor on the weak links in the controller and motor winding, flexible redundancy control method.
Has the weak link in the reversing of brush dc motor, more difficult to achieve uniaxial output of redundant control.
Rare earth permanent magnet material of high intrinsic coercive force, magnetic field orientation and thus easier to achieve approximate to the rectangular wave set up in the air gap magnetic field, realize the square wave drive, increase the output of the machine.
Because the rare earth permanent magnet motor has the above a series of advantages, and therefore is very suitable for the performance, size, weight requirements special aviation;
Rare earth permanent magnet brushless dc motor, in particular, is thought to be most promising in the field of the motor.
Permanent magnetic material is found and the use of the first type of magnetic material, for example, ancient Chinese compass.
Permanent magnet materials, relative to the soft magnetic materials, also called hard magnetic materials.
Magnetism performance just refers to the magnetic materials after plus magnetization of the magnetic field can long retain its strong magnetic, is characterized by high coercive force.
Coercive force is to through demagnetization magnetic materials after magnetization make with residual magnetic field strength reduced to zero.
The soft magnet manufacturer material is easy magnetization and magnetic field, and easy demagnetization, namely low coercive force of magnetic materials.
Demagnetization refers to the added magnetic field (
After make the magnetization of the magnetic material, add with magnetizing field opposite the direction of the magnetic field reduce its magnetic field.
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