A vector control and field weakening method and system for an embedded permanent magnet synchronous motor

Abstract

A vector control and field weakening method and system for an embedded permanent magnet synchronous motor, belonging to the technical field of permanent magnet motors, by calculating the MTPA, field weakening and MTPV control trajectory curves of the embedded permanent magnet synchronous motor, combined with the motor voltage limit, current Limit and torque curve, from the curve to obtain the running trajectory diagram of the motor AC and DC axis current, adopt the feedforward feedback hybrid field weakening control, according to the feedback voltage and the given torque after the limit, look up the table from the trajectory diagram, and obtain the DC axis Given value of current, complete field weakening control in vector control. The present invention solves the problem that the two-dimensional look-up table occupies computing resources in the existing field-weakening control, and proposes to realize vector control hybrid field-weakening based on the one-dimensional look-up table, and ensure stability, which is used for motor vector control, so that the current changes during the change process. The torque change is small and the transition is smooth. The method of the invention only uses the integrator to adjust the direct-axis demagnetization current, simplifies the software setting steps, and has high consistency between the given torque and the output torque, which is beneficial to improving the bandwidth of the speed loop.

Description

technical field [0001] The invention belongs to the technical field of permanent magnet motors, in particular to an embedded permanent magnet motor, which is a method and system for vector control and field weakening of an embedded permanent magnet synchronous motor based on a one-dimensional look-up table. Background technique [0002] Permanent magnet synchronous motors have the characteristics of high power density, low moment of inertia, and high efficiency, and are widely used in servo devices with high precision, high reliability, and wide speed range. Among them, the embedded permanent magnet motor can further improve the overload capacity of the motor and widen the range of speed regulation because of the use of reluctance torque. The field weakening control of the embedded permanent magnet motor has become an indispensable part of the vector control system and has been extensively studied. It is mainly divided into the following three methods: Feedforward field weak...

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Problems solved by technology

[0005] In the above published patent documents, most of the mixed field weakening methods use the two-dimensional look-up table method, only US20170085199A1 does not use the two-dimensional look-up table, but it assumes the precondition of linear transition of the current vector, which will inevitably cause torque changes in a wide range, and the patent literature does not clearly explain the acquisition of the given value of the current vector in the MTPA and field weakening area

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