Intelligence Protection System Of Electric Motor Based On Network

Motor has many advantages , such as simple structure, being cheap , maintaining and using conveniently and so on, so it is adopted extensively in the different fields of national economy. However, because of supply power state and mechanical load getting changeable, it makes the malfunction rate of the motor very high. The malfunction will damage the motor, but also influence the whole production, cause the enormous economic losses. So, in order to guarantee the normal production of the industrial enterprise, the safe operation of the motor is very important.This text has analyzed the common malfunction of the asynchronous motor at first. And then it, which is based on symmetrical weight theory, has drawn accurate criterion of the trouble of the motor, confirmed the protective measures of different troubles. Finally, it has realized kinds of protection functions, such as short-circuit protection, rotate-stop protection, over-heat protection, negative current protection, zero current protection, low-voltage protection, over-voltage protection, overlong start-up time protection, frequent start-up protection, lock protection of electric leakage and so on.This text has selected 16-bit computer SPMC701 as micro-controller, whose CPU is micro-controller and signal processor newly produced by Taiwan Sunplus Technology CO. LTD. The single-chip computer has built-in SRAM and FLASH ROM, and dose not need to expand the RAM and ROM. Having strong function and high-efficient instruction system, SPMC701 has realized intelligence protection of the motor. Its circuit is simple and its function is comprehensive.In order to realize the motor's demand for distributed measuring and controlling, control system based on network has such characteristics as convenient for centralized management and information sharing. Using PROFIBUS to the motor protection system and regarding single motor' s protective device...