Abstract:With the power electronics and microcomputer control technology and the rapid development of the people of AC motor speed control of the in-depth study DC Speed exchanges were gradually replaced by the governor. The existing AC motor speed control methods, VVVF by people's attention, In many areas has been used in China have been listed as a key project to promote the technology. - Sinusoidal voltage pulse width modulation (SPWM) converter with unique advantages in technology and the rapid development and wide application. Advanced control strategies, the control of high-performance chips, intelligent high-speed switching devices combining modern AC trend of the mainstream of development. Digital methods in terms of reliability, flexibility, controllability, and other aspects simulation method unmatched superiority. Currently, the market has introduced a digital INVERTER; most have adopted a special SPWM chip. Although the program will enable simple, but these devices are often expensive and increase the cost of hardware.
Because of this, The design of the inverter using Microchip introduced the Motor exclusive eight PIC16F76 microcontroller 7 a digital converter, have driven through programming SPWM signal, greatly simplified for the purpose of generating a PWM waveform software and hardware, allowing the system to simplify and improve their static and dynamic properties.
Keywords： frequency speed control； SPWM； electrical machine；PIC16F767
