Modeling method of flux linkage adjustable permanent magnet synchronous reluctance motor

Abstract

The invention discloses a modeling method of a flux linkage adjustable permanent magnet synchronous reluctance motor. The method comprises the following steps: extracting relation data of change of motor stator flux linkage and electromagnetic torque along with armature current and rotor position angle through finite element modeling analysis, solving an inverse function through a pair flux-current relationship function, constructing an armature current database taking stator flux linkage and rotor angle as parameter variables and an electromagnetic torque database taking armature current androtor angle as parameter variables, and further obtaining change rate data of the armature current and the electromagnetic torque of the motor along with the temperature through finite element analysis at different temperatures. Meanwhile, a motor loss real-time calculation formula is obtained in a finite element simulation and experiment fitting mode, on this basis, motor loss equivalent currentis solved, and the motor control mathematical model is further corrected. According to the method, the influence of multiple factors such as space magnetic field harmonic waves, magnetic saturation, quadrature / direct axis coupling, motor loss and temperature change is comprehensively considered, and an accurate calculation model of the motor is established.

Description

technical field [0001] The invention relates to a modeling method of a permanent magnet synchronous reluctance motor with adjustable flux linkage, and belongs to the technical field of motor modeling. Background technique [0002] Synchronous reluctance motor has the advantages of solid structure, strong overload capacity and low cost. In recent years, it has gradually become a substitute for asynchronous motors in some high-efficiency and high-reliability applications. In order to further improve the torque density and power factor of the synchronous reluctance motor, a permanent magnet synchronous reluctance motor is formed by adding a small amount of permanent magnets to the rotor. The permanent magnet synchronous reluctance motor has both permanent magnet torque and reluctance torque, so it can solve the shortcomings of permanent magnet synchronous motor in terms of magnetization, reliability and cost to a certain extent. [0003] However, the structure of permanent mag...

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Problems solved by technology

However, this method of offline motor model correction is difficult to take into account the real-time influence of factors such as temperature changes and loss current, which in turn affects the accuracy of the motor control model, and some complex offline motor electromagnetic analysis cannot be directly used for real-time motor control. Limits the improvement of motor control performance

In addition, the AC / DC axis current components of permanent magnet synchronous reluctance motors are tightly coupled, and the current components participate in the motor torque generation and magnetic field regulation at the same time, which in turn affects the motor loss and operating efficiency. In addition, the commonly used NdFeB permanent magnets have low magnetic adjustment efficiency , which brings difficulties to the efficiency-optimized operation of permanent magnet synchronous reluctance motors in a wide speed range

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