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Open loop and closed loop control system

Author:qiwo motor Views:Close

2021-05-06 15:07

The control system composed of the brushless DC motor can be divided into an open-loop control system and a closed-loop control system.
 
  Open loop control system is the simplest and most complicated control system. Only the rotor position sensor provides rotor position feedback information, so that the motor commutation is always synchronized with the rotor position. The speed and current of the motor are determined by the mechanical characteristics of the motor and the mechanical characteristics of the driven load. If the voltage or load changes, the speed of the motor will also change and it cannot be controlled.
 
        The common speed and current double closed-loop system can obtain better control performance, and can realize speed regulation or constant speed and steady speed control within a certain range. It needs speed feedback and current information feedback, so it is usually necessary to set a speed sensor and a current sensor.
 
  This article is taken from ------"Permanent Magnet Brushless DC Motor Technology"