Alternating current synchronous motor controller based on FPGA and control method thereof

Abstract

The invention discloses an alternating current synchronous motor controller based on FPGA and a control method thereof. The feedback digital processing of a coder and a current sensor and the control of the current operation of a motor are simultaneously carried out by FPGA; simultaneously, dynamic errors caused by the system error of the feedback current value and a common mode rejection ratio are reduced in the digital filtering of the current feedback sensor; in the feedback process, a polar duty ratio after digital filtering replaces the feedback current value for converting linear data, thereby avoiding the nonlinear processing in the converting process of the current value and the data errors due to multiplication computation; in the processes of the data logic computation and the processing of a current ring and a speed ring, the absolute value and the symbol bit of the data are used as a data combination, thereby simplifying the data processing of programming design; and in addition, a uniform synchronous clock is supplied in the control and renovating process of the speed ring and the current ring, thereby eliminating the errors caused by a time sequence problem in the data transmission process in the computation and the control of the current ring and the speed ring.

Description

technical field [0001] The invention relates to an FPGA-based AC synchronous motor controller and a control method thereof, belonging to the technical field of AC motor controllers. Background technique [0002] For the traditional AC motor controller design, a dedicated digital chip is usually used as the main control chip. At present, the mainstream control chip is a DSP digital processing chip, supplemented by other chips as the interface for data processing and communication. This type of main control chip can usually realize relatively complex digital calculations, but due to the complexity of the on-chip circuit, the chip function is single, and at the same time, the control must follow a certain sequence, and the interrupt method is often used when multitasking is required. , resulting in an error in the control time. [0003] For the FPGA chip, since the on-chip layout and wiring are realized by means of software programming, and there is no predetermined logic circ...

AI Technical Summary

Problems solved by technology

In terms of accuracy, because FPGA can perform various static timing analysis on the modules after programming, layout and wiring, it can correct the delay time or clock deviation jitter of the current circuit, and for special digital chips because its on-chip circuit is the established logic The timing of the circuit becomes a fixed value after the chip development is completed. At the same time, the highest frequency used by this type of chip for the circuit is lower than the FPGA chip of the same price in a sense, so the accuracy is often lower than that of the FPGA chip of the same price level. chip

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