Motor magnetizing and demagnetizing method for pure electric vehicle based on local linearization hysteresis model
A pure electric vehicle, hysteresis model technology, applied in circuits, magnetic objects, electrical components, etc., can solve the problems of difficult modeling and analysis of non-linear hysteresis characteristics of AlNiCo materials, and achieve high speed regulation range, Simple effect of magnetic field adjustment means
Inactive Publication Date: 2018-07-03
常州市武起常乐电机有限公司
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However, since the demagnetization curve of AlNiCo material shows obvious nonlinearity, such as figure 1 As shown, completely different from NdFeB permanent magnet materials with strong anti-demagnetization ability, the nonlinear hysteresis characteristics of AlNiCo materials bring difficulties to the finite element modeling and analysis of motors
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[0025] The present invention will be described in detail in conjunction with accompanying drawing now. This figure is a simplified schematic diagram only illustrating the basic structure of the present invention in a schematic manner, so it only shows the components relevant to the present invention.
[0026] A method for charging and demagnetizing a pure electric vehicle motor based on a locally linearized hysteresis model of the present invention,
[0027] Step 1: If figure 2 As shown in , the actual hysteresis curve of the AlNiCo material is linearized piecewise, and a piecewise linearized hysteresis model is established. The hysteresis loop is fitted into a set of equal-width parallelograms. Among them, the saturation hysteresis loop and all local hysteresis loops have the same coercivity H c , with different remanence B rk , and the initial magnetization curve partially coincides with the hysteresis loop; and the magnetic field strength H of the magnetized magnetomoti...
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The invention provides a motor magnetizing and demagnetizing method for a pure electric vehicle based on a local linearization hysteresis model. The method comprises the following steps: carrying outsegmental linearization on the actual hysteresis curve of an aluminum-nickel-cobalt material, building a segmental linearization hysteresis model, and calculating (B,H) value of each unit of a permanent magnet at the moment by utilizing a finite element, so that magnetizing and demagnetizing operations are carried out on the permanent magnet. Online regulation and control on a motor magnetic fieldis realized by regulating magnetization intensity of the aluminum-nickel-cobalt material, loss caused by magnetizing and demagnetizing can be neglected as time for applying a magnetizing current pulse is relatively short, and a motor can maintain higher efficiency while wide speed regulation range is maintained; and a magnetizing winding used for online magnetizing and demagnetizing is directly introduced, so that a magnetic field regulating means is simple and direct.
Description
technical field [0001] The invention relates to the technical field of pure electric vehicle motors, in particular to a method for charging and demagnetizing a pure electric vehicle motor based on a locally linearized hysteresis model. Background technique [0002] In the flux memory stator permanent magnet motor for pure electric vehicles, the online magnetic regulation of the motor is possible because the magnetizing winding uses alnico permanent magnet materials. The amount of AlNiCo permanent magnet material in the motor directly determines the key performance indicators such as the power density and output of the motor. Therefore, establishing an accurate motor finite element model, analyzing and evaluating the basic electromagnetic performance of the motor is the correct application of AlNiCo Permanent magnet materials, the prerequisite for realizing the online adjustment and control of the motor magnetic field. However, since the demagnetization curve of AlNiCo mater...
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IPC IPC(8): H01F13/00
CPCH01F13/003H01F13/006
Inventor 鲍方
Owner 常州市武起常乐电机有限公司