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The application of rare earth permanent magnets in unmanned aerial vehicle (uav)

by:Newland     2020-04-17
The application of rare earth permanent magnets in unmanned aerial vehicle (uav) with rare earth permanent magnet materials, power electronics, microelectronics, computer, new control theory and the progress of the theory of motor, rare earth permanent magnet motor technology development is very rapid, shows a wide application prospect in aviation and strong vitality. Application of rare earth permanent magnet motor in aviation has the following characteristics: 1, due to the high magnetic energy product of rare earth permanent magnet materials, makes the motor can significantly reduce weight, reduce the volume. Aviation with motor has very strict requirements on the size, weight. Modern aviation aircraft, each 1 kg weight equipment takes about 15 ~ 30 kg to support the additional weight. 2, high coercive force Hc of rare earth permanent magnet material, remanence Br, thus can produce very big air-gap flux, greatly reduce the permanent magnet rotor diameter, thereby reducing the moment of inertia of the rotor, reduce the time constant, improve the dynamic characteristics of the motor. 3, you can pick and choose the larger air gap width value, so that we can reduce the torque fluctuation caused by the cogging effect, also can inhibit the armature reaction on the fluctuation of torque. Armature reaction of rare earth permanent magnet demagnetization effect is small, more suitable for sudden reversal, locked-rotor drive and other special performance requirements. 4, the use of brushless dc motor has the following marked characteristics: long service life. Currently has a brush dc motor is widely used in plane, life is only a few hundred hours. With the continuous development of aviation technology, the aviation motor factory all face pressure to extend the life of the product technology. When life calls for increased to 1000 to 2000 hours, have the characteristics of brushless dc motor have been unable to meet the requirements. Brushless dc motor without brush and commutator, life indicators can be greatly improved. Magnetic characteristics of process knowledge: permanent magnet materials, high stability, namely the external disturbance, vibration environment factors such as magnetic field and the degree of high stability. 2, high coercive force. 3, high residual magnetic flux density and high remanent magnetization. 4, high maximum magnetic energy product. Magnet, powerful magnets, special-shaped magnets, magnet manufacturer,
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