High Precision Brushless DC Motor Position Feedback Technology for Three-Axis Turntable
The flight simulating three-axis turntable used to simulate the spatial angular movement of the aircraft, its ground-based simulation experiment depends directly on the credibility of the angle measuring. Aiming at high-precision position feedback require
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Abstract The flight simulating three-axis turntable used to simulate the spatial angular movement of the aircraft, its ground-based simulation experiment depends directly on the credibility of the angle measuring. Aiming at high-precision position feedback requirements, designed a circuit board of motor drive based on a combination of DSP and CPLD, the hardware design, graphics programming. Analysis of simulation experiments is described here in detail. The fourfold frequency encoder value is used in combination with the rotary transformer, through the comparison of the data analysis to verify the position feedback techniques have good feasibility and versatility.
Keywords Turntable BLDCM Fourfold frequency Double position feedback
1 Introduction Three-axis Flight Simulating Turntable consists of driving system, servo system, machinery, feedback system, experimental component, etc. Since the world’s first simulator in 1945 from the Massachusetts Institute of Technology developed to date, its development tendency from single-axis to multiaxis form, apply to the professional, related to standardization, control to real-time, software to intelligent, rotation rate to wide range, and position to high precision. Turntable Simulates aircraft angular movement of the whole navigation, it is the core of vehicle semi-physical simulation experiment on the ground. When simulation, DSP receives and tracks tri-axial framework for RT position signals from controller, convert it to a physical movement can be recognized by the sensor G. Liu (&) B. Mo H. Zhu J. Lin School of Aerospace Engineering, Beijing Institute of Technology, Beijing, China e-mail: [email protected]; [email protected]
Z. Wen and T. Li (eds.), Practical Applications of Intelligent Systems, Advances in Intelligent Systems and Computing 279, DOI: 10.1007/978-3-642-54927-4_101, Springer-Verlag Berlin Heidelberg 2014
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and can provide experimental conditions for 100–150 mm diameters based on inertial compound guidance mode, lasers, satellites, and variety of smart seeker. Turntable adopted tri-axis vertical U–O–O structure and driving by servo device, motor, gear-box, shaft-driven system; Technology combined motor side encoder with frame-side resolver enforce double closed-loop, high precision position feedback. The signals shift, fourfold frequency resolution, risk avoid, and 32-bit counter are included Self-developed Turntable Drive Board, design focuses. Framework-end hollow rotating transformer mainly used as comparison between absolute angular position measurement and design effects.
2 Principle 2.1 Servo Control System of Simulation Turntable Brushless DC Motor Simulating Turntable’s inner, middle, and outer three-axis framework, characterization of aircraft navigation movement of roll, pitching, yaw. With single-axis framework as an example, BLDCM servo control system is shown in Fig. 1. Among them, single-axis position directives and photoelectric encoder, resolver after compensation algorithm for feed forward, fo
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