Permanent magnet synchronous motor (PMSM) fractional order variable structure model considering iron loss and identification method

Abstract

The invention discloses a permanent magnet synchronous motor (PMSM) fractional order variable structure model considering iron loss and an identification method. According to the invention, the integer-order inductance of a traditional motor equivalent circuit model is extended to the fractional order inductance, and with the addition of a fractional order parameter, the model gains more degrees of freedom and greater flexibility; and meanwhile, the iron core loss is introduced into the model so that the model for the research on the motor efficiency optimization is more accurate. In the invention, the model variable structure is realized through the switching control between the two models, therefore, the accuracy of the model is higher, the practicality and accuracy of the model are balanced, the multiple demands of the motor dynamic response and efficiency optimization are satisfied, and a high application value is gained.

Description

technical field [0001] The invention relates to a fractional-order variable structure model and an identification method of a permanent magnet synchronous motor considering iron loss. Background technique [0002] With the depletion of energy and the increasingly serious environmental pollution, electric vehicles have attracted more and more attention and become the main direction of future automobile development. The motor drive system is the core component of the electric vehicle power system and the output load of the power battery, which is crucial to the power, economy and comfort of the vehicle. Drive motors for electric vehicles, such as AC asynchronous motors, DC brushless motors, switched reluctance motors, permanent magnet synchronous motors, in-wheel motors, etc. Among them, permanent magnet drive motors have high efficiency, high energy density, fast response, and speed regulation. With many advantages such as good performance, small size and reliable operation,...

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Problems solved by technology

[0005] Existing models generally do not consider the core loss. In fact, after the motor runs stably, the steady-state efficiency optimization of the motor becomes the focus of system consideration and attention, and the core loss is a factor that cannot be ignored in the efficiency optimization of the motor. Therefore, a single structure model cannot take into account both Due to the multiple requirements of motor dynamic response index and motor efficiency optimization, it is inevitable to study how to realize the variable structure of the model

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