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Proceedings Paper

A study on a micro-stepping drive system for space pointing platform
Author(s): Shuang Yang; Bao-quan Li; Xin Zhang
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Paper Abstract

Along with the continuous development of the research in the space exploration field, the precision rotation control system is widely utilized in a lot of payloads of the satellites. It is stepping motor cooperating with reduction gear wheel to accomplish the precision rotation in some pointing platforms of the camera used in the satellite. By contrast with that, the approach of this paper could precisely control the rotation angle of the stepping motor without using reduction gear wheel. Therefore, the size and the height of the instrument would be reduced base on simplifying the structural design. Moreover, it reduces the cost to some extent. In this paper, it is adopted that the digital signal processor (DSP) controller and bipolar constant current motor drive circuit UC3717 to make a high performance, high subdivision, miniature control system come true, which is used to drive two-phase hybrid stepping motor. The methods are applied by the driver system that sine cosine micro stepping and constant current chopper drive with a fixed chopper period. The driver system also supplies the functions that involve subdivision selection, clockwise rotation or counter clockwise rotation control, and over current or over voltage or under voltage or overload protection, and so on. The description in this paper also includes the total schematic design, the approach to get current table in different subdivision levels, the current control method in hybrid stepping motor, the way to reduce electro- magnetic interference (EMI) of the hybrid stepping motor. And the total schematic design contains the DSP controller, the communication interface of the driver system, the design of power driving circuit, the interface circuit between the electrical sources, the constant current chopper drive circuit for the two-phase hybrid stepping motor. At last, it is verified by some experimental investigations that the control system not only has miniature size, simplified system design, improved high frequency torque frequency characteristic and low frequency stability, but also has enhanced adaptability and self-protection capability, improved accuracy of position control and reliability of the driver. And the driver system is capable of dividing a full step into 256 micro steps. because it is 1.8°that the angle of the full step of the two-phase hybrid stepping motor in the full step mode, therefore, it results in 51,200 steps per revolution (0.007º/step). So it could fulfill the demand of the precision rotation control system used in some payloads of the satellites.

Paper Details

Date Published: 15 August 2011
PDF: 8 pages
Proc. SPIE 8196, International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, 81961Q (15 August 2011); doi: 10.1117/12.900964
Show Author Affiliations
Shuang Yang, Ctr. for Space Science and Applied Research (China)
Bao-quan Li, Ctr. for Space Science and Applied Research (China)
Xin Zhang, Ctr. for Space Science and Applied Research (China)

Published in SPIE Proceedings Vol. 8196:
International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications
John C. Zarnecki; Carl A. Nardell; Rong Shu; Jianfeng Yang; Yunhua Zhang, Editor(s)

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