Application of Brushless Retarder Starter on Rubber Mixer Guizhou Tyre Co., Ltd. is a leading enterprise in the rubber industry in Guizhou Province. It was restructured and listed in 1996 and is now ranked in the top ten tire industry in the country. Rubber mixing is an initial process for tire manufacturing. The quality and production value of tires are directly affected by the quality and output of plastics produced by the rubber compounding plant. It is crucial to ensure that the rubber compounding equipment operates properly. My branch currently has 16 large-scale plastic mixing production lines. Each production line is equipped with an internal mixer, a tablet press, and a film cooling device. The motor power of the mixer and tablet press of our factory is from 55KW to 240KW, and all the winding AC asynchronous motors are used. The starting method is the traditional rotor current limiting start (rotor loop series frequency sensitive rheostat control). In the actual production and operation process, the electrical control part has more failures. If a single tablet press fails, it will directly lead to the shutdown of the entire production line, which will seriously affect the unit's operating rate, restrict the completion of the production plan, and reduce the company's output. In May 1994, after the research and phased trial of the brushless variable resistance starter by our branch, it was confirmed that the technical requirements for reducing the motor starting current can be achieved and the consumption of spare parts can be reduced. Since 1996, our branch has gradually reconstructed nearly 30 winding AC induction motors, all of which have changed to brushless variable resistance starters. Comparison of implementation results before the transformation of the transformation table 1, the spare parts are expensive, maintenance and preparation 1, small investment, maintenance and spare parts storage costs are high. Reduced preparation costs. 2, high failure rate. 2, greatly reduce the failure rate. 3, heavy quality, maintenance and replacement difficulties. 3, maintenance and replacement is convenient. 4, the supporting control circuit is cumbersome, fault 4, the circuit is simplified, the control is convenient and hidden. Use to reduce hidden dangers. 5, start the shock, current is large. 5. Eliminate start-up vibration and reduce start-up current. Through the transformation of the electrical control of the equipment, we have mastered the application of new technologies and new products; this not only saves the cost of maintenance and spare parts; it reduces the maintenance difficulty of maintenance personnel and reduces the maintenance time; it also reduces the safety caused by safety The accident has made the safety production of branch plants reach a higher level; at the same time, it has also ensured that the equipment can be operated in a long period and with high efficiency in order to meet the needs of production. This successful technological transformation has greatly encouraged the enthusiasm of technicians, provided us with experience in retrofitting, effectively solved the problems in practical work, and laid a solid foundation for improving the operating rate of equipment and the reliability of equipment operation.