General Description YJK series compact type high voltage three-phase induction motor (shaft center height H355-630mm) is our new product that optimized on the basis of a great deal of introduced technology and our experience of designing and manufacturing three-phase high voltage induction motors. YJK series compact type three-phase induction motor is an optimized and upgraded high voltage three-phase induction motor with excellent performance, featured by light weight, compact construction, low noise, small vibration, good reliability and convenience for installation and maintenance. The respect to enclosure protection degree according to GB4942.1 and IEC34-5 (Classification of Enclosure Protection of Electrical Machines), the motors of this series are of IP54, Other degrees of protection are also possible upon customer's requirements. In respect to cooling methods according to GB1993 and IEC 34-6(Cooling Methods for Rotating Electrical Machines) the motors of this series are of IC411, and other cooling methods are also possible upon customer's requirements. In respect to type of mounting, the motors of this series are of IMB3 horizontal with feet, satisfying the requirements of GB997 and IEC34-7 (Construction and Code for type of Mounting of Electrical Machines). The type of IMV1 vertical with flange can be provided. The motor of series YJK is of enclosed compact type with protection degree of IP54 and with two independent (inner outer) air circuits, in which the low-noise fans are adopted respectively to effectively reduce the noise level of the motor. Structure Description: The motor of series YJK is of enclosed compact type with protection degree of IP54 and with two independent (inner & outer) air circuits, in which the low-noise fans are adopted respectively to effectively reduce the noise level of the motor. The frame and end cover are made of nodular cast iron with lightweight and rigid construction, he surface of which is equipped with orthogonal arrangement ribs. The inner wall of the frame near to the end portion of stator coils as well as the inner wall of the cover is also provided with the same ribs, which can greatly improve the cooling capability and the rigidity of the frame and en