Motion System Design
Bearings roll with two-story truck

Bearings roll with two-story truck

At 24 ft high, 29 ft wide, and 47 ft long, Liebherr’s T282 B is the world’s largest mining truck. The nearly two-story-high truck has a payload of 399 tons.

To handle the high load requirements, Liebherr turned to wheel bearings from The Timken Co., Canton, Ohio. Eight tapered roller bearings are included on the truck axles, two per wheel. The front wheel bearings have an 18.33-in. bore and 23.35-in. OD. The rear wheel bores are 29.25 in. and have a 38.61-in. OD. The bearings support 567 tons maximum load, 39.8 mph maximum speed, and 3,650 hp.

Future engineers get real-world experience

Milwaukee School of Engineering students can work hands-on with the latest motor control technology, thanks to 10 new motor drives donated by ABB Inc., New Berlin, Wis. The addition to the Industrial Control Laboratory completes the extensive retrofit of the facility.

The ac drives are installed into eight refurbished student test benches and will be used as part of the Electrical/Electronics Communication curricula. “Students will program the drives and operate motors that simulate real-world installations and loads,” says Dr. Glenn Wrate, director of the master of science in engineering program at MSOE. “Beyond an introduction to the technology, they learn the equipment’s performance qualities in order to understand what control features they can access, modify, and offer customers in the workplace.”

ABB’s proprietary Direct Torque Control (DTC) technology, which delivers full torque twisting power to a motor at zero speed, is built into five of the industrial drives donated. The drives are so new they’re still being introduced into the marketplace.

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