MOTORS AND DRIVES track-mounted drilling rigs. The smaller package requires less space for inline applications but provides greater pump centreline distance. The centreline drop input and output provide large oil volume movement as well as the massive housing ribbing generating an improved energy balance. This ensures economic and sustainable operation.”
Mining truck drives
The EH4000AC-3 mining truck displayed at the Hitachi Construction Machinery booth at MINExpo featured a Hitachi designed, built and supported AC-Drive system.“ Hitachi’ s Advanced AC-Drive System outperforms previous systems through its simplicity, improved efficiency and enhanced dependability, resulting in some of the most technologically advanced trucks on the market.”
“ It’ s perfectly matched for Hitachi trucks,” said Craig Lamarque, Division Manager, Hitachi Construction Machinery.“ The entire Hitachi AC-Drive system is designed, built and supported by the same company – Hitachi. It’ s Hitachi to the core. As a result, the system delivers higher torque, faster acceleration, smoother retardation and lower operating costs.”
Hitachi has been at the forefront of AC Drive propulsion technology for more than 30 years. Now, the company has channelled this expertise into Hitachi AC-Drive trucks. The system includes Hitachi’ s own Insulated Gate Bipolar Transistor( IGBT) inverter, alternator and wheel motors. Key features include the slip slide control system. The system’ s slip / slide control feature acts like both an active traction control and an anti-lock brake system designed for slippery conditions. It reduces tyre slippage on acceleration and tyre lock-up during braking.
The pitch control feature of the Advanced AC-Drive System reduces bouncing / rebounding on the truck as it hits bumps or uneven ground on the haul road. As the truck comes to a stop, the rebounding or rocking effect due to the change in inertia of the truck is also reduced. This increases load efficiency and reduces spillage while increasing reliability and durability of the truck.
The Advanced AC-Drive System also provides a side skid control feature that helps the operator in slippery road conditions when making turns. By utilising changes in the wheel motor torque from left-to-right during cornering, it assists the operator in turning the truck and keeping it on the proper track in over and under steer conditions.
The Hitachi Dual Path Epicyclical Planetary design provides high efficiency and easy maintenance. Operating temperatures are lowered by allowing the first( outer) planetary carrier to travel at wheel speed. In addition, the lifespan of components and lubricants are increased as a result of an inverter controlled lubricant circulation system that includes lubricant cooling and filtration.
“ The Hitachi AC-Drive system results in haul trucks that are more valuable assets for mining operations,” said Lamarque.“ The system delivers better performance, higher uptime and helps reduce maintenance and fuel costs.”
A partnership agreement has just been signed between Komatsu and GE,“ to jointly provide the highest quality, time-effective remanufacturing services for electrical components of mining vehicles and equipment.”
“ Our expanded partnership with GE will ensure quality and efficiency improvements,” says Sean Taylor, Managing Director and CEO of Komatsu Australia.“ This creates added value for our customers, by helping them extend component life and reduce unplanned downtime.”
GE off-highway-vehicle electric-drive systems have long been used by Komatsu.“ Both pairs of companies have worked in mutualistic relationships to develop advanced solutions in their fields. Take the GE GDY108C-powered Komatsu 363 t 980E-4, the Japanese manufacturer’ s largest-ever haul truck, released just weeks ago in Australia. Where Komatsu previously subcontracted remanufacture and service of GE propulsion systems to third parties, Australian mining customers will now
have the benefit of the two original equipment manufacturers working as one to also provide unmatched overhaul services and analysis.”
“ Komatsu has world-class shops here on the mechanical side,” says Chris Duhamel, Senior Services Regional Manager at GE Transportation-Mining, which was a key architect of the agreement.“ I think the mining downturn really started to make our two companies become more creative, to start to
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NOVEMBER 2016 | International Mining 57