400 HP

The Ward Leonard WL12BB040 inverter-rated AC induction motor is the industry’s coolest running form wound 400 HP 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 Performance Ratings
400 Hp (300 kW)
575 V
Full Load Current
410 A
Rated Speed
1161 RPM
Max. Mechanical Speed
(3200) RPM
1810 lbf-ft (2455 N-m)
2800 Lb (1270 kg)
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
  • Designed to be a drop-in motor for most top drives including the Varco TDS-11SA and the Tesco ESI
  • The 400 HP is the coolest running motor on the market
  • The 600 HP is the same size as the 400 HP, and will drop into a TDS11-SA without having to modify the physical structre of the top drive
  • CSA, ATEX, IECEX Certified
  • Blower – top or side mount
  • TDS-11 SA Pinion
  • Brake Hub
  • Pressure Switch
  • Encoder
  • Heat Exchanger
  • Junction Box