Abstract
The work is dedicated to reaction wheel assembly automatic control system design as a part of spacecraft orientation system. The data processing algorithms for resolver-to-digital converter 1310NM025 output signals are given in this paper. This chip is used as a feedback signal source in dynamic rotary torque control system. Two measuring channels of the chip are involved. They are configured to receive the same input resolver signals with different resolutions (fine and coarse ones). Thus, the algorithms are used for the maximum output signal resolution expanding by mixing fine and coarse channel measurement results. The first algorithm adds up the fine channel rotation speed value depending on its overflows number. The second algorithm is necessary for setting initial rotation speed measurement of the first one when the system starts. It is also needed to make sure that rotation speed measurement is working correctly during reaction wheel assembly operation. Thus, the increased digital velocity signal resolution can be achieved without limiting rotation speed of resolver by using the above methods. The considered system is fully implemented by using domestic electronic components, which also includes the 1310NM025 chip developed by Milandr Inc. and field-programmable gate array 5576ХС6Т. Verilog HDL has been used for the above algorithms digital implementation. The designed rotation speed measurement prototype and the whole system positive experiment results were obtained.
Keywords
Rotation speed measurement, a static control system, reaction wheel assembly, field-programmable gate array, resolver-to-digital converter, dynamic torque control, acceleration control, 1310NM025 chip, spacecraft orientation and stabilisation system, resolver, rotor position detector, digital control system, measuring channels mixing, resolution increasing method.
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