Steady-state and dynamic characteristic equivalent circuit of single-sided liner induction motor for traffic actuation

Abstract

The invention discloses a steady-state and dynamic characteristic equivalent circuit and method of a single-sided liner induction motor for traffic actuation. According to the invention, on the basis of one-dimensional model of the motor, an air gap magnetic flux density equation is established; an air gap and all field quantities and complex powers in a guide plate are solved by combining a primary current and a boundary condition; and then a field circuit complex quantity power equal principle is utilized to deduce a secondary resistance value and an excitation reactance value, thereby establishing a single-phase equivalent circuit. Five correction parameters are used for respectively correcting influences on the secondary resistance value and a mutual inductance value by a longitudinal end effect, a horizontal edge effect and a semi-filling groove. On the basis of the principle of power conservation and coordinate transformation, a two-phase dynamic equivalent circuit is also constructed. Because of utilization of the correction coefficients, influences on the motor mutual inductance, the primary resistance, the air gap equivalent magnetic potential and the equivalent air gap length by the longitudinal end effect, the horizontal edge effect, the semi-filling groove, and the air gap magnetic circuit saturation can be effectively corrected; the steady-state and dynamic driving characteristics of the liner induction motor can be represented accurately; and the steady-state and dynamic driving analyzing difficulty of the liner induction motor can be substantially reduced.

Description

technical field [0001] The invention relates to the technical field of linear induction motor electromagnetic field analysis, in particular to a single-phase steady-state and two-phase dynamic equivalent circuit and analysis method of a single-sided linear induction motor used in a traffic drive system. Background technique [0002] At present, urban traffic traction systems (such as subways and light rails) mostly use Rotary Induction Machines (RIM for short), which require intermediate conversion devices such as gearboxes to convert rotational motion into linear motion, and rely on the adhesion characteristics between wheels and rails to transmit traction . Linear induction motor (Linear Induction Machine, referred to as LIM) traction train does not need a conversion device, it is directly pulled by the primary and secondary horizontal electromagnetic thrust, and is not affected by adhesion. It has fast acceleration and deceleration, strong climbing ability, and good heat ...

AI Technical Summary

Problems solved by technology

This model can analyze the steady-state and dynamic driving characteristics of the motor at the same time, and can also be used in electromagnetic design, but the disadvantage is that the calculation accuracy is greatly affected by the number of motor poles, and it is difficult to be widely used

Images