400HP – WL12BB040

The Ward Leonard WL12BB040

inverter-rated AC induction motor is the industry’s coolest running form wound 400HP motor: up to 5 years and 100,000 hours of continuous duty.

Developed for optimal use in top drives, rotary tables and drawworks applications, this motor is constructed with nodular cast iron and designed to withstand high shock and vibration conditions. With Certified Class H insulation and a maximum temperature rise of 95°C, the WL12BB040 is suited for any climate or hostile operating environment.

Key Features

  • 4-pole stator with form wound windings
  • Certified Class H insulation
  • Cast aluminum rotor bars
  • 2-cycle global VPI
  • Constructed with nodular cast iron
  • Designed for Variable Frequency Drive (VFD) operation
  • Heaters — 1 each end
  • 4140 & 4340 alloy shafts available
  • IP 44 motor enclosure
  • Shaft seals & oil slingers on the drive & non-drive sides
  • Six (6) 100Ω platinum RTDs; 2/phase embedded in stator
  • ISO 9001:2015-certified

Technical Data

Motor Diagram

Motor Diagram

Speed Torque Curves

Speed Torque Curves


Custom Engineering

Need to optimize this motor to fit specific application requirements? No problem. Our only goal is to deliver a motor that will be the most efficient and effective solution for your needs. Just Contact Us today to speak with an engineer about your specs… or your “wish list.”

Support Center & Resources

MotorCare Video

400HP AC Drilling Motor –
Model WL12BB040

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Ward Leonard
MotorCare Brochure

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Ward Leonard Oil &
Gas Brochure

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