... to oil fields, such as Drilling rigs, derrick, hook, rotary table and so on. Features:-- Adopt advanced DC drive technique, the ... applied, which can get step-less speed control to drawworks, rotary table and mud pumps, users can acquire expected drilling performance. ... auxiliary brake is Eddy current brake or Eaton brake--Rotary table is driven independently or compoundly--Substructure type of sling ...