Motor inductance accounting method _ inductance coil _ electromagnetic coil
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Motor inductance accounting method _ inductance coil _ electromagnetic coil

Motor inductance accounting method
 
    Motor inductance accounting (perhaps reactance accounting, the difference between the two electrical angle frequency 2 × π × f) determines the function of the motor, which is the key parameter of motor analysis and design.
    Regarding a motor with uniform air gap, for example, an asynchronous motor, because the shape of the magnetic potential wave and the magnetic dense wave are common, the difference between the two is only one air gap permeability constant, so only the magnetic density wave is required to be integrated, and the flux linkage and the inductance can be obtained. . Regarding motors with uneven air gaps, such as synchronous motors, switched reluctance motors, etc., the magnetic density wave depends not only on the magnetic potential but also on the shape of the air gap. Because the air gap is not uniform, it is difficult to calculate the inductance. At this time, two methods can be used. One is the finite element method. As long as the model is built, the software will actively calculate the magnetic density and inductance. However, sometimes the demand knows the analytical solution of the inductor, so that it is convenient to qualitatively analyze the motor. At this time, the so-called magnetic permeability function analysis method can be selected. The permeance function analysis method performs Fourier decomposition of the air gap magnetic wave to obtain a constant term, a fundamental wave and a high order magnetic wave. In order to determine the Fourier coefficient in the air gap permeance function, the finite element method is used to calculate the family air gap specific permeability curve. By determining the air gap permeability function, it is possible to calculate the air gap magnetic density = air gap magnetic potential × air gap permeability function. With the air gap magnetic density, the same integral method as the air gap uniform motor can be used to calculate the flux linkage and inductance.

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