余积卿：基于单片机的感应电动机 PWM 变频调速系统设计
Abstract
In power electronic device manufacturing technology and the continuous rapid
development of power electronic control technology, thanks to the development of
frequency converter, frequency control of motor speed of the motor in the
theoretical research and practical application of rapid development. Frequency
control of motor speed above the performance of the speed regulation not only have
improved by leaps and bounds, at the same time in control technology and
compensation technology has also been qualitative leap, improve and simplify the
control strategy of the motor frequency control of motor speed become the main
way of speed adjustment. Thanks to this, coupled with ac motor without commutator
as well as the simple structure and so on factors leading to the modern ac motor
has a tendency to replace the dc motor. In view of the many advantages of frequency
control of motor speed, so this way of speed control is becoming more and more
becomes the primary communication speed.
Ac speed regulating system is a complex system, the whole system consists of
ac motor, inverter, power supply voltage of main circuit and detection circuit,
drive circuit, and the whole control system. In order to achieve the frequency
control of motor speed, but also must study the dynamic mathematical model of ac
motor, and to coordinate transformation. Ac speed regulation system of ac motor
and inverter and power supply is an integral part of the main circuit system; And
control system is the core of the whole control circuit part, here is the core
of intelligent control chip, here we are using AT89S52 in single chip microcomputer
control system, also contains a pulse generating circuit intelligent chip SA4828
circuit, including some of the less peripheral hardware devices at the same time,
because of using the single chip microcomputer as control core, so the whole circuit
of the hardware design is concise, for pulse output and feedback control methods
such as flexible, only need to change the program, the design of motor object is
an induction motor, we mainly completed the motor speed control. The main task
of control system design completed intelligent chip SA4828 is introduced, the main
circuit (ac motor and inverter, driver circuit and power supply), speed regulation
control strategy, buffer and protection circuit of the inverter 52 microcontroller
