400 HP Vertical AC Top Drive Motor

The Only Heavy Duty 400 HP Form Wound Motor Designed for Top Drives.

In severe conditions, random wound motor failures are caused by a combination of several destructive factors including high VFD voltage spikes, excessive top drive vibration, rain and contamination (weather conditions), random windings (weaker than form wound) and overheating.

That’s why we designed and built the first heavy duty form wound 400 horsepower top drive motor with a better designed and engineered optional cleaning motor blower.

Gulf Electroquip DRILLMAX motors satisfy a wide range of applications within the oilfield industry.  The GEQ DRILLMAX400™ Top Drive Motor was developed to meet required specifications of the IEC 60034.1 standards.

We listened to drillers and built a 400 HP top drive motor that works better and lasts longer.


  • Double the Seals
  • Air Cleaning Blower (Optional)
  • DOUBLE the Bearing System
  • Safer/faster Connection
  • Upgraded Power Circuit
  • Cast Aluminum Rotor
  • Form Wound Design
  • Double the Bearing System
  • Interchangeable with Existing Motors


  • Form windings contribute to longer motor life and more reliable motor service
  • Increased installation, operator and maintenance safety / convenience
  • Longer motor life resulting in minimizing down time and lowering operating costs
  • Interchangeability with existing motors provides convenience and flexibility


  • Thermal Block
  • RTDs
  • Pinion
  • Brake Hub
  • Junction Box
  • Cable Connectors


  • Onshore Drilling Rigs (Top Drives)


  • Base Speed: 1155 RPM
  • Max Speed: 3750 RPM
  • Duty: (IEC): S1, Continuous
  • Current at Rated Load: 368 AMPS
  • Efficiency: 96%
  • Number of Poles: 4
  • Full Load Torque: 1818 FT|LBS
  • Intermittent Duty Torque: 3250 FT|LBS
  • Intermittent Duty Cycle: (IEC) S9, 1155 RPM at 480 HP for 120 seconds; 80 RPM at no load for 90 seconds
  • Ambient Conditions: -20°C to +50°C at 400 HP with 1100 SCFM cooling air
  • Max. Altitude: 1 Km (3300 FT)
  • Bearings Upper Bearing: Thrust Ball Bearing, Lower Bearing: Roller Bearing
  • Cooling: Separate Force Ventilation 1100 SCFM at 40°C
  • Weight: Approximately 2500 LBS
  • Connections: Buss Tab, Terminal Board, Flying Lead
  • Enclosure: IP44
  • Color: Safety Yellow


  • Rated Output: 298 KW (400 HP)
  • Rated Voltage: 575V
  • Rated Frequency: 39.5 Hz
  • Weight: Approximately 2500 LBS

Performance Charts

Click on an image to view

Compatible Products


DRILLMAX400 Brochure
Product Brochure