Case Study
Conveyor
The site location was not surrounded by natural heritage areas and there was no straight path for the conveyor to follow. However, the new orebody and the existing train system required a link so this 16km conveyor was designed to run at 7000tph with a large horizontal bend in the middle as well as multiple inclines and declines.
The conveyor was driven by four 2MW Squirrel Cage motors which were each controlled by a 4.4MVA VVVF. At the head of the conveyor, the master drive was coupled to the same pulley as one of the slaves while another slave had its own pulley nearby. The final slave was 16km away at the tail end of the belt and required optical connections for timely communications with the master.
The conveyor was part of a new installation to transfer ore from a primary crusher toward a train loadout with the goal of providing a new orebody with access to the train system.
In addition to the normal smooth starting, stopping and variable speed requirements for this conveyor application the additional special features required were:
1. The capability to control the torque of each motor to ensure even loading while also controlling the speed to maintain belt tension during starting.
2. Capability of regenerative braking of each motor in synchrony.
3. Safely stop the conveyor in the case of an emergency.
4. High reliability to ensure that this critical link between the crushers and the trains experiences minimum downtime.
Conveyor Figure 1
Conveyor Figure 2
Toshiba TMdrive-MVe2 is a versatile and reliable VVVF that has built upon decades of Japanese ingenuity to boast a wide variety of proven features. With the assistance of the team, these challenges became opportunities to demonstrate the versatility of a Toshiba drive system.
The Toshiba TMdrive-MVe2 is so versatile that it can also be used for synchronous motors. The overland conveyor feeds onto a gearless conveyor, driven by a Toshiba 1.5MW low-speed synchronous motor which truly represents the pinnacle of Toshiba engineering.
The gearless conveyor was selected due to high load fluctuations (very high to very low loading) that are not ideal for conventional gearbox-driven conveyors due to potential backlash.
The advantages of the synchronous motor included:
1. The high torque for starting and braking (with the assistance of the Toshiba VVVF).
2. Reduction of maintenance, the synchronous motor has no brushes and without a gearbox, the downtime for maintenance is greatly reduced.
The Toshiba MVe2 VVVF for the synchronous motor came with an AC exciter panel which was fed from the VVVF input panel, removing the requirement for additional cabling.
The conveyor was driven by four 2MW Squirrel Cage motors which were each controlled by a 4.4MVA VVVF. At the head of the conveyor, the master drive was coupled to the same pulley as one of the slaves while another slave had its own pulley nearby. The final slave was 16km away at the tail end of the belt and required optical connections for timely communications with the master.
The conveyor was part of a new installation to transfer ore from a primary crusher toward a train loadout with the goal of providing a new orebody with access to the train system.
In addition to the normal smooth starting, stopping and variable speed requirements for this conveyor application the additional special features required were:
1. The capability to control the torque of each motor to ensure even loading while also controlling the speed to maintain belt tension during starting.
2. Capability of regenerative braking of each motor in synchrony.
3. Safely stop the conveyor in the case of an emergency.
4. High reliability to ensure that this critical link between the crushers and the trains experiences minimum downtime.
Conveyor Figure 1
Conveyor Figure 2
Toshiba TMdrive-MVe2 is a versatile and reliable VVVF that has built upon decades of Japanese ingenuity to boast a wide variety of proven features. With the assistance of the team, these challenges became opportunities to demonstrate the versatility of a Toshiba drive system.
The Toshiba TMdrive-MVe2 is so versatile that it can also be used for synchronous motors. The overland conveyor feeds onto a gearless conveyor, driven by a Toshiba 1.5MW low-speed synchronous motor which truly represents the pinnacle of Toshiba engineering.
The gearless conveyor was selected due to high load fluctuations (very high to very low loading) that are not ideal for conventional gearbox-driven conveyors due to potential backlash.
The advantages of the synchronous motor included:
1. The high torque for starting and braking (with the assistance of the Toshiba VVVF).
2. Reduction of maintenance, the synchronous motor has no brushes and without a gearbox, the downtime for maintenance is greatly reduced.
The Toshiba MVe2 VVVF for the synchronous motor came with an AC exciter panel which was fed from the VVVF input panel, removing the requirement for additional cabling.
