the electric motor controller is widely used in many process. 1.In many paper mills, color printing factory, dyeing and weaving mill, electric wire and cable factory, the processing, metal foils processing plant etc. 2.During the involution processing , deal with something such as paper, cloth, lines, metal foils, Film material and products, these all need to use manual tension control for the rewind and unwind. 3.A complete set of tension control system, it's basic elements including controller, clutch and brake. 4.Tension control can be divided into manual control and automatic control.5.Manual controller, which is stablized power, according to the change of rewind and unwind roll diameter ,then manually adjust the magnetizing cutrrent of clutch or brake, thereby obtain the conformity tension.

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