Comprehensive speed regulating control method of asynchronous motor

• Main Authors: ZHOU LI, FAN GUOPENG, ZHOU WENQING, JIANG TAO, LI ZHENHUA
• Format: Patent
• Language: English
• Published: 03.06.2015
• Subjects: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERATION

The invention discloses a comprehensive speed regulating control method of an asynchronous motor, and particularly relates to a comprehensive control method of a coil wound rotor asynchronous motor. The system comprises a coil wound rotor asynchronous motor, a three-phase alternating current power supply, a double PWM converter, a high power alternating current-direct current-alternating current PWM frequency converter, a rotating speed detection device, voltage and current frequency signal detection equipment and a signal summarizing module, wherein the high power frequency converter is connected between the three-phase alternating current power supply and a stator winding for regulating voltage and speed of the asynchronous motor which is in simple structure and easy to operate as well as regulating speed in variable voltage and variable frequency with high efficiency; the input end of the double PWM converter is connected with a stator winding while the output end is connected with a rotor winding to form an energy flow loop for saving electric energy by using slip power and further reducing double-fed speed regulation of the frequency converter capacity. The detection device and the detection equipment feed detection signals back to two frequency converter signal control ports for controlling the frequency converter. The system integrates various speed regulating methods to realize functional complementation, so that the advantages are maximized.