• SSGD-1000 AC Gear Driven Drawworks

    The AC electric powered single speed gear driven SSGD-1000 Drawworks offers a design unique to the industry. 

    The AC electric powered single speed gear driven SSGD-1000 Drawworks offers a design unique to the industry. By overpowering a drawworks with AC motors, we are able to create a single shaft, single speed drawworks with hoisting performance comparable to a conventional drawworks. The result is a simple design with few mechanical parts, a small footprint and low weight. These drawworks require minimal maintenance, are entirely self-contained and completely enclosed.


    Electric Motors:

    The SSGD-1000 Drawwork is equipped with 5 ea. GEB-22A1 (General Electric) alternating current (AC) motors. Continuous rating is 845 kW (1150 HP), 600 VAC, 1024 A at 800 rpm. The motors are Exe motors with forced air-cooling. The motors have installed temperature sensors (PT100 elements) in the stator windings and for monitoring the main bearings. Encoders are mounted at the motor non-drive end for measuring the motor speed. The speed feedback from the encoder gives input to the frequency converters for optimal regulation of the AC-motor parameters.


    Motor Cooling Blowers:

    Blower skid assembly is provided for cooling of the Drawworks motors and ventilation of the enclosures. The skid consists of two blowers, back draft dampers, high efficiency weather louvers and an outlet plenum chamber.


    A damper is provided on the Drawworks roof between the plenum chamber and the AC-motors for isolation of the motors.


    Drawworks Control System:

    The Drawworks Control System consists of the following main parts:

    • Drawworks Control cabinet
    • Miscellaneous Field Instrumentation
    • Drawworks Interface Panel
    • Emergency stop

    The control system software includes the following features as standard:

    • Monitoring and control of brake and lube system
    • Monitoring of GE motor temperature and cooling pressure
    • Interface to hook load sensor (dead line)
    • Dynamic Floor and Crown Saver System
    • Disc Brake testing system
    • Disc Brake burning in system
    • Cut & Slip function
    • Drawworks power management system

    Hoisting with 5 motors:

    The diagram below shows the hoisting capacity with all 6 motors available. An overload of 10% is required for hoisting 1000 short tons on 2.layer. This can according to the motor vendor be done for several minutes provided that the motors are allowed adequate cooling time afterwards. No overload is required for lowering or holding the 1000 short tons (static hook load).



    The SSGD-1000 Drawworks Control System is designed to provide enhanced safety and integrity for the operation, machinery, and the personnel on the rig. This is achieved by an active control philosophy with equipment self-checks and monitoring, and by use of duplicated critical equipment.

    The primary safety requirement for the SSGD-Drawworks is that 'one single point of failure shall not cause any hazardous condition leading to either personnel injury or any damage to the equipment'.


    The SSGD™ Drawworks is designed as a lifting device for drilling operations with fail-safe spring applied brakes.








    5 Motors

    4 Motors

    Continuous  Horsepower



    2nd Layer Hook Load (Tons)



    12 Lines



    14 Lines



    Drawworks Dimensions L x W (in)

    368" x 154"

    300" x 144"

    Drum Dimensions Dia x L (in)

    55" x 82"

    48" x 82"

    Weight (lbs)