Control Strategy
Release time:
2021-11-22 19:14
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Control Strategy
With the development of power electronics technology, microelectronics technology, digital control technology and control theory, the dynamic and static characteristics of the AC drive system are completely comparable to the DC drive system. The AC drive system has been widely used, and the AC drive has gradually replaced the DC drive. Become a reality.
Since AC motors are essentially non-linear, multi-variable, strong coupling, time-varying parameters, and large disturbances, their effective control has always been a hot topic in domestic and foreign research. A variety of control strategies and methods have been proposed. Among them, classical linear control cannot overcome the large-scale changes of load, model parameters and the influence of nonlinear factors, and the control performance is not high; vector control and direct torque control also have some problems: in recent years, with modern control and intelligent control theories Development, advanced control algorithms are applied to AC motor control, and some results have been achieved
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Steady state model control method
Commonly used steady-state model control schemes include open-loop constant v/f ratio control (ie voltage/frequency = constant) and closed-loop slip frequency control.
With the development of power electronics technology, microelectronics technology, digital control technology and control theory, the dynamic and static characteristics of the AC drive system are completely comparable to the DC drive system.
The structure of a synchronous motor is roughly the same as that of an alternator. The basic difference between it and an induction motor is that its rotor is a protruding magnetic pole with a coil, and another exciter is used to pick up the direct current and the alternating current)
The induction motor is also called "asynchronous motor", that is, the rotor is placed in a rotating magnetic field, and under the action of the rotating magnetic field, a rotating torque is obtained, so the rotor rotates.
AC motors are composed of a stator and a rotor
AC motors are composed of a stator and a rotor. AC motors are divided into two types: synchronous AC motors and induction motors. In both motors, the stator-side winding is supplied with alternating current to generate a rotating magnetic field, but the rotor winding of a synchronous AC motor usually requires an excitation machine to supply direct current (excitation current); while the induction motor does not need to be supplied with current to the rotor winding.
An AC motor is a device that converts AC electrical energy into mechanical energy. The AC motor is mainly composed of an electromagnet winding or distributed stator winding to generate a magnetic field and a rotating armature or rotor. The motor is made by using the phenomenon that the energized coil rotates under a force in a magnetic field. AC motors are divided into two types: synchronous AC motors and induction motors.
