Servo System Design Based On Arm Changes In Temperature Air Conditioning

Temperature-adjusted air-conditioner is a temperature followed system which is based on "indoor microclimate" principle in medical aerography. Compared with traditional air-conditioner, it does not preset value for indoor environment, but intelligently controls indoor temperature according to outdoor temperature variety. Temperature-adjusted air-conditioner emploies semiconductor refrigerator as cold (hot) source, Brushless Direct-Current (BLDC) motor as execute outfit, it realizes the rapid follow and adjusts indoor temperature with outdoor temperature.Temperature servo system used as execute outfit is a subsystem of temperature-adjusted air-conditioner. Based on the principle of temperature-adjusted air-conditioner, a kind of digital servo control system with ARM (Advanced RISC Machines) microchip LPC2214 as its core is presented.The whole structure and control scheme of the system, realization methods for all parts have been analyzed in detail, then, the feasibility of design is demonstrated, and hardware circuit is designed. The hardware circuit of temperature servo system uses digital temperature controller with LPC2214 as its core, the system samples indoor and outdoor temperature signals with temperature sensor DS1820, and displays all kinds of parameters with LCD module.Aimed at BLDC motor, which is the execute outfits of temperature servo system, a kind of power driven circuit which uses power MOSFET and gate driven integrate circuit IR2130 is designed for servo system. The BLDC motor can be driven effectively by selecting bootstrap components reasonably and protecting power component correctly.On the basis of characteristic of temperature servo control system, a kind of control arithmetic based on tri-loop model with indoor temperature, rotate speed and current has been presented. The speed-adjusted program of temperature servo control system has been written with C language, compiled, linked and run in ADS (ARM Developer Suite) environment successfully.The BLDC motor di-loop model has been established in MATLAB environment, and the PED parameters of speed loop and current loop are fixed on with Ziegler-Nichols method, which provides reference for actual design.