... 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, 50HZ is ... NEMA D motor for oilwell pump with high quality