A double-winding voice coil motor and its compound drive control method

Abstract

The invention relates to a dual-winding voice coil motor and a composite driving control method therefor, belongs to the control field of a super-precision voice coil motor, and mainly solves the problem of influence of current ripple generated under switching drive of the voice coil motor to thrust output of the voice coil motor system, so as to further improve the output precision of the voice coil motor system in the super-precision field. The voice coil motor adopts a brand new dual-winding structure, namely a main winding and an auxiliary winding are mounted on the same iron core; the main winding is used for generating main thrust required by the exterior, and is realized by a switching control method; the auxiliary winding is used for compensating ripple thrust generated by the main winding; and in addition, a linear analogue control method is adopted, and by extracting the ripple signal generated by the main winding, the current ripple generated by the main winding is compensated in real time, so as to ensure that the overall voice coil motor system has high output precision as well as relatively high power output.

Description

technical field [0001] The invention relates to the field of motor drive control, in particular to high-precision and high-response occasions such as photolithography machine systems, precision machine tools, and high-end physical experiment devices, and specifically relates to a double-winding voice coil motor and a composite drive control method thereof. Background technique [0002] Voice Coil Motor (VCM) is a motor designed based on the principle of Lorentz force, which can directly convert electrical signals into linear displacement without any intermediate conversion mechanism. It has the advantages of simple structure, small size, light weight, small inertia, and large specific thrust. It is also used in high-precision, high-frequency excitation, fast and high-acceleration positioning systems, as well as in optical and measuring systems, optical assembly, and aerospace. Wide range of applications. [0003] There are two options for voice coil motor drive control: lin...

AI Technical Summary

Problems solved by technology

However, the chopper driving method in the switch control scheme leads to large current ripples, resulting in large fluctuations in the overall thrust, so that it cannot be used in high-precision servo systems

In order to better suppress the current ripple, it is necessary to increase the switching frequency of the power device, and put forward extremely high requirements for the computing power and real-time performance of the microprocessor. However, due to the bottleneck of the power electronic device and the computing power of the microprocessor, the switching frequency And the calculation speed of software cannot be increased without limit, so there is an urgent need for a drive control method that can satisfy high-frequency response, high precision, and high power to suppress current ripple and improve the output accuracy of the voice coil motor system

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