Driven rotary motor require speed, because the kiln varies greatly, must ensure that more than 1:3 speed range. Rotary motors are commonly used in DC motor, wound rotor induction motor, electromagnetic induction motor, commutator variable speed motor, squirrel cage induction motors and multi-speed squirrel cage induction motors. Kiln commonly used DC motors, DC motor speed range, enabling smooth stepless, smooth start, startup performance, is conducive to automation. DC power supply, in the past with AC motor driven DC generator-powered electric generators, but many of rotating machinery, maintenance workload and other shortcomings, thyristor control devices used in recent years to overcome these shortcomings, speed range reached more than 1:10, start fast, fully meet the production needs. The above article by Henan YuFeng Heavy Machinery (http://www.yufchina.com) finishing release, reproduced, please indicate the source!