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LTI BullShaft™
LTI’s 1150 hp and 1500 hp TorqForce AC motors feature an innovative plus: the patented BullShaft™ design. The BullShaft features a larger, more heavy-duty construction than conventional shafts providing it with the strength to withstand the torsional forces that lead to shaft failure.
Unlike competitive models, which employ non-standard shafts and components to accommodate these torsional forces, the BullShaft design uses only standard components and hub patterns. As a result, BullShaft-equipped LTI motors are easily serviced and require no modification for standard AC motor installations. |
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 TorqForce™ AC Motors |
LTI™ Power Systems TorqForce AC motors are designed and manufactured to meet the requirements of the most demanding traction application. Available in 400, 550, 1150, and 1500 hp models, these traction motors are designed specifically for 480-690 volt operation. To meet varying installation requirements, LTI TorqForce AC motors are also available in vertical or horizontal designs.
These motors combine the latest in motor design and materials technology with the highest quality manufacturing and testing procedures to deliver superior performance and reliability. Every motor is rigorously tested: water-immersion wire tests prior to winding to ensure insulation integrity; surge-comparison winding tests before vacuum pressure impregnation and dip coating; pre-assembly water immersion stator tests followed by post-assembly insulation testing; and testing of assembled motors.
Features of LTI TorqForce AC motors
- 3-phase 440-480VAC
- DOL starting at full load
- Squirrel-cage induction type
- High-slip tolerant (wide speed range)
- Open frame style
- Flange mounted design
| LTI 400hp TorqForce AC Motor Performance Data |
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Power |
400hp (298kW) continuous
600hp (448kW) @ 150% overload |
| Voltage |
600VAC (690VAC maximum) |
| Current |
366A continuous,
538A @ 150% overload |
| Torque |
1750 ft lbs continuous
2625 ft lbs @ 150% overload |
| Speed |
0-1180 RPM (40Hz) constant torque
3000 RPM maximum - horizontal mount
2400 RPM maximum - vertical mount |
| LTI 550hp TorqForce AC Motor Performance Data |
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Power |
550hp (410kW) continuous
825hp (615kW) @ 150% overload |
| Voltage |
600VAC (690VAC maximum) |
| Current |
537A continuous,
781A @ 150% overload |
| Torque |
2450 ft lbs continuous
3675 ft lbs @ 150% overload |
| Speed |
0-1180 RPM (60Hz) constant torque
3000 RPM maximum - horizontal mount
2400 RPM maximum - vertical mount |
| LTI 1150hp TorqForce AC Motor Performance Data |
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Power |
1150hp (858kW) continuous
1500hp (1287kW) drawworks duty |
| Voltage |
600VAC (690VAC maximum) |
| Current |
1050A continuous,
1514A @ 150% overload |
| Torque |
7550 ft lbs continuous
11,325 ft lbs drawworks duty |
| Speed |
0-788 RPM (40Hz) constant torque
3000 RPM maximum - horizontal mount
2400 RPM maximum - vertical mount |
| LTI 1500hp TorqForce AC Motor Performance Data |
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Power |
1500hp (1119kW) continuous
2250hp (1679kW) drawworks duty |
| Voltage |
600VAC (690VAC maximum) |
| Current |
1300A continuous,
1898A @ 150% overload |
| Torque |
9848 ft lbs continuous
14,772 ft lbs drawworks duty |
| Speed |
0-788 RPM (40Hz) constant torque
3000 RPM maximum - horizontal mount
2400 RPM maximum - vertical mount |
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