Steady-state characteristic analysis method for linear induction motor

Abstract

The invention discloses a steady-state characteristic analysis method for a linear induction motor. The steady-state characteristic analysis method includes the following steps: 1), creating an unidimensional magnetic-density distribution model of the linear induction motor; 2), calculating the magnetic density of a y-axis according to the unidimensional magnetic-density distribution model; 3), acquiring electric field intensity through the magnetic density of the y-axis according to characteristics of magnetic barrier surfaces; 4), calculating plural forms of amplitudes of a normal magnetic-density travelling wave, an inlet-end magnetic-density reflecting wave and an outlet-end magnetic-density reflecting wave; 5), calculating impedance of the normal magnetic-density travelling wave, the inlet-end magnetic-density reflecting wave and the outlet-end magnetic-density reflecting wave; 6), calculating total impedance of a single-phase circuit of the linear induction motor; 7), analyzing performance parameters of the linear induction motor in different stable states. By the steady-state characteristic analysis method, analysis difficulty and calculation time of the magnetic characteristics of the linear induction motor are reduced; the steady-state characteristic analysis method is high in accuracy and can be conveniently applied to initial electromagnetism optimization design and middle-late-period electromagnetism parameter and driving performance analysis of the linear induction motor.

Description

technical field [0001] The invention belongs to the technical field of computer-aided design of linear induction motors, and more specifically relates to a modeling method of equivalent circuits for analyzing steady-state characteristics of linear induction motors. Background technique [0002] Linear induction motors can directly generate linear mechanical motion without the need for intermediate transmission conversion devices. They have the advantages of simple structure, durability, and low cost. They are widely used in transportation, mine hoisting, parcel distribution, electric doors, roller coasters, etc. However, due to the inconsistency of the primary and secondary widths of the linear induction motor, as well as the influence of the primary open magnetic circuit and the half-filled slots at both ends of the primary, there are different degrees of transverse and longitudinal air gap flux density distortions, and with different slips, primary coils The excitation fre...

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Problems solved by technology

However, because the premise assumption is too simple, the model cannot reasonably describe the motor characteristics under the conditions of lateral edge effect, high speed and high current excitation, and it cannot be applied to the electromagnetic optimization design of linear induction motors (G.Kang and K.Nam, Field -oriented control scheme for linear induction motor with the end effect, Proc.Inst.Elect.Eng.-Elect.Power Appl.,vol.152,no.6,pp.1565–1572,Nov.2005)

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