Satellite Antenna Servo Drive Mechanism

The satellite antenna scan drive institution is a core component of the whole satellite system, which has an effect upon the attitude of satellite and gathering data. On the base of particular introduction of several AC servocontrol technologies, the system adopts the Permanent Magnet Synchronous Machine as the driver motor and the Permanent Magnet Brush-less motor as the momentum balance motor. The hardware and software of the system have been designed and debugged on the CPU of special motor controller-TMS320F240. The servo driven motor uses absolute situation photoelectric encoder as situation feedback device in order to assure the system precision. The closed loop control mode including position feedback, velocity feedback and current feedback is adopted for the driver motor so that high precision and steady running can be realized. The closed loop control mode including velocity feedback and current feedback is adopted for the momentum balance motor so that fast and accurate trace can be realized.In the control software, the Object-oriented method is used for doing system analysis and study. Furthermore, the Message-driven mechanism is used in the control software research and design. The instantaneous zero vector inserting space vector PWM theory is adopted to control the Permanent Magnet Synchronous Machine as the driver motor in the control software. The mixing programming is adopted in order to take advantage of the assembly language and C language. The experimentation proves that the system is steady-going and reliable and the scheme is reasonable and feasible.