... for Beam Pumping Units application with special high slip (5 to 13%),very high starting torque and very soft ... durability, quiet operation ,reduced vibration ,advanced construction ,high safety and reliability in service, convenience for application and ... :60Hz(50Hz is availiable on request)7,Rated voltage:460V(415V is available on request) ,380V, ... NEMA D motor for oilwell pump with high quality