Brushless servo control system and driving apparatus based on permanent magnet brushless DC motor

Abstract

The invention provides a driving device of a permanent magnetic brushless direct current (DC) servo motor, comprising a control unit, an interface unit and a driving unit; the control unit is connected with the driving unit by the interface unit; the control unit adopts a field programmable gate array (FPGA) and has high integration, low power dissipation and good operation real-time performance;the key point of the design of the control system is the control to three loops: a current loop, a speed loop and a position loop and the integral matching of the three loops so that three control modes of moment, speed and location can be realized; the control system can be used for simple speed regulation and also can be applied to high-precision positioning control situations; and when the brushless servo control system of the driving device is adopted, the current detection feedback signal and the magnetic pole detection feedback signal are directly obtained from the feedback element of the permanent magnetic brushless DC motor, thus being different from the traditional sampling method of the feedback signal of the servo system, thereby ensuring the signal sampling precision and reducing the cost.

Description

Technical field: [0001] The invention belongs to the field of industrial automation control, and in particular relates to a brushless servo control system and a driving device with an FPGA as a core control unit and a permanent magnet brushless DC servo motor as a control object. Background technique: [0002] With the continuous progress of science and technology and the rapid development of economy in our country, in the field of industrial control, the application field of servo system is becoming wider and wider. According to the national conditions of our country, in a large number of cases, it is necessary to use small automation equipment, which requires low cost, but also needs to meet the high precision and fast response of automatic control. In order to adapt to this national condition, the inventor at first designs and improves the control object of the servo system, that is, the motor body. The AC servo motor widely used at present is due to the use of incrementa...

AI Technical Summary

Problems solved by technology

[0003] In the past, the electric drive system with permanent magnet brushless DC motor as the control object, although the cost is low, but the traditional brushless DC motor, because there is no current sampling element, so it cannot perform phase current sampling, so most of them are only used for simple speed regulation For electric drive occasions, the drivers mostly adopt double closed-loop control of current loop and speed loop, which is difficult to apply to high-precision control occasions such as positioning control

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