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Alternating current motor-->YR，YRKS、YRKK series series

General Description 　　YR，YRKS，YRKK series medium-sized high voltage Wound rotor three phase asynchronous motors are our latest products,there are totally 6 frame size ranging from H355 to H630. 　　To develop these series motors,advanced analytic and calculation technology is used,fine materials and excellent workmanship are also adopted during manuffacturing.All of those give series motors high efficiency,low noise,low vibrability. 　　All motors in basic design are of horizontal with feet mounting type(IMB3),duty type is continuous operation(S1). 　　Normally,the motors have three types of enclosure protection degree:IP:23,IP44 or IP54. 　　In respect to cooling type,the motors basically have IC01,IC81W,IC611 or IC616 four types to be selected. 　　Series motors may be uesd to drive rolling mills,grinders,hoists,belt conveyers,heavy load blowers,etc. Briefing of construction 　　 A steel plate welded construction has been used to reduce the frame weight and increase the rigidity,optimum construction design also makes series motors convenience for installation and maintenance. 　　One piece laminations for the stator and rotor are precision-stamped from low loss eletrical steel,thus the iron loss is minimized and the efficiency is improved. 　　The insulation class of series motors is class F.The stator coil is a double layer formed coil,the stator core is stacked and assembled with coils outside the frame,coil braces are applied on the circumference of the stator coil ends with spacers inserted between coils to improve rigidity.After the connection between coils is made,the completed stator winding is placed in a vacum tank and impregnated,then the stator winding is put into the stator frame and fixed with it. 　　The rotor cores are shrunk onto the sharft and rotor coils are tightly fitted into the slots to minimize vibration.Advanced brazing technology of the rotor coils to coils insures high mechanical strength and good electrical conductivity at the brazed joints.The coil ends are supported by bandage.The rotor winding is vacuum pressure impregnated(VPI)and connected to the slip ring unit.This construction gives the rotor an excellent fit against centrifugal forces. 　　The slip ring unit is mounted outside the frame to the non-drive end in order to provide easy maintenance without disassembling the motor.As a result,the bearing are closer together,preventing any vibration.Carbon dust,caused by brush wear,is prevented from entering the motor dueto the location of the unit.The slip ring unit has a shaft mounted fan and an easily removable and washable filter located in the slip ring housing to collect the carbon dust caused by brush wear. 　　The standard designed series motors adopt anti-friction bearings,self-lubricated with grease or oil according to motor's frame size and operating speed,separate oil supply system is not needed.Split sleeve bearings could also be used when specified by purchaser,they are either ring-lubricated or forced-oil lubricated depending on the loading.