A method for controlling the excitation current of solid stator magnetic levitation

Abstract

A method for controlling the excitation current of a solid stator maglev, including the following steps: (1) Establishing an excitation current control system with FO[PI] as the core controller; (2) Deriving the mathematical model of the controlled object; (3) According to the fractional order Calculus theory, to further deduce the amplitude and phase characteristics of the controlled object; (4) deduce the amplitude and phase characteristics of other parts of the control system; (5) obtain the amplitude and phase characteristics of each link in the control system through the above steps, and comprehensively get the whole Control the amplitude and phase characteristics of the open-loop transfer function of the system; (6) Simultaneous equations, solve the three control parameters Kp, Ki, and λ in the controller to obtain ideal current control performance; according to the designed cut-off frequency, stable The margin and the phase angle conversion rate of the cutoff frequency are zero to solve the controller coefficients. The obtained control system has better control performance than the traditional PI controller, and is more suitable for the current control of the magnetic levitation system with a solid stator structure.

Description

technical field [0001] The invention belongs to the technical field of magnetic suspension bearings, and in particular relates to a method for controlling the magnetic suspension excitation current of a solid stator. Background technique [0002] Magnetic suspension bearing (active magnetic suspension bearing) is a new type of bearing that suspends the rotor without contact through the magnetic field force between the stator core and the rotor core. It combines the knowledge of rotor dynamics, mechanical design, control theory, power electronics, electromagnetics, computer testing technology and signal processing technology, and is a typical mechatronic product. Due to the absence of mechanical contact, it has the following obvious advantages compared with traditional mechanical bearings: low requirements for the working environment; the rotor has no contact and no mechanical friction, and the magnetic suspension bearing does not require lubrication and sealing systems; the ...

AI Technical Summary

Problems solved by technology

In actual industrial products, the stator of the magnetic levitation electromagnet usually adopts the lamination process to reduce the eddy current loss. However, the lamination process itself is cumbersome. Sub-processing reduces production efficiency and makes mass production of magnetic levitation equipment difficult

The use of a solid stator structure can greatly improve the production efficiency of magnetic suspension bearings, but the problem is that the solid structure will produce a large eddy current effect, which will cause the reluctance of the ferromagnetic material to change with frequency, and for the current control loop. It is said that the load inductance becomes a time-varying parameter, which will greatly affect the performance of the original current control loop

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