Abstract
Compares with the direct current motor, exchanges the electric motor to have the structure simply, the price small advantage, the maintenance convenient, the inertia small and so on a series of merits, the single plane power ratio direct current machine is much higher, the voltage is easy to make the high pressure, but also can realize high speed drives. Along with the modern electric power electronic technology and the computer development as well as the modern control theory application, the exchange velocity modulation application is more and more widespread, this article to exchanged the velocity modulation theory to carry on the introduction. This article with emphasis studied has pressed the velocity modulation technology by the monolithic integrated circuit control motor exchange accent, the exchange accent presses the velocity modulation belongs to the energy consumption Slipping velocity modulation method, mainly used in the cage shape asynchronous motor. In the article introduced the monolithic integrated circuit to the electric motor the control, elaborated the crystal thyratron accent presses the velocity modulation the principle by and its the control system principle of work, introduced the hardware system design and the software system establishment. The hardware system mainly by 8 monolithic integrated circuits AT89C52 control, the periphery electric circuit which including ADC0809, DAC0832, 8,279, chip and so on LED numerical code tube is composed. This system function is complete, so long as the feedback signal will pick into the monolithic integrated circuit then to realize to is controlled the quantity the closed-loop control, in which has used the PID control method, will be able even more to satisfy all kinds of request which the production process proposed. Soft start the merit prefers to realize falls presses the starting, thus reduced the trigger volume, saved the funds, the controlled variable exterior adjustment has caused it to be suitable for the different load and the situation request. The real time display merit prefers to help the user direct-viewing to find out the system current working condition. The system may obtain the bigger velocity modulation scope with the induction motor coordination, the anti-jamming stronger, the performance and the price are higher than, the cost far is lower than the frequency conversion velocity modulation system, this enable this system to have the bigger promoted application potential.
Key word: The motor adjusts the pressure to modulate velocity AT89C52 the PID control