The speed control methods in the cooling fan can be divided intofive methods:PWM, TC, VC, RC CS, and thefollowing explanations: 

 PWM is the abbreviation of  Pluse wide modulation , fixed frequency, duty cycle speed regulation   

TC   is the abbreviation of Temperature Control , temperature control speed 

VC   is the abbreviation of  Voltage Control , the voltage signal controls the speed   

RC   is the abbreviation of  Risister Control , resistance ( usually a potentiometer ) controls the speed  

CS   is the abbreviation of  Const Speed , constant speed after reaching the rated voltage 

The above are the five speed adjustment methods in the cooling fan !

The above information comes from Dongguan Yinhai Electronics Co., Ltd. ( www.yinhaidg.com ), an enterprise focusing on fan R&D and production . Please indicate the source for reprinting!