Product category:
Industrial Drives/Controls
News Release from: ABB Automation Tech (Drives and Motors) | Subject: ACS 5000
Edited by the Engineeringtalk Editorial
Team on 05 December 2005
AC drive for motors up to 6.9kV
Multi-level, fuseless, medium voltage AC drive from ABB for applications driven by standard motors up to 6.9kV.
A multi-level, fuseless, medium voltage AC drive from ABB is for applications driven by standard motors up to 6.9kV Called the ACS 5000, the drive is rated from 5 to 24MW and can be applied to standard industrial motors (asynchronous and synchronous) found in cement, mining and minerals, chemical oil and gas, marine, metals, pulp and paper, power generation and water and waste water treatment
This article was originally published on Engineeringtalk on 8 Feb 2000 at 8.00am (UK)
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A 37 kW variable speed drive with Direct Torque Control (DTC) from ABB Automation is being used to control the speed of a motor in a friction-welding machine that manufactures valves for car engines.
The inverter unit combines several technologies such as the multi-level fuseless voltage source inverter (VSI-MF) design, direct torque control (DTC) motor control platform, IGCT power semiconductors, power block and the elimination of traditional fuses.
The VSI design allows switching operations that are free from torque pulsations over the entire speed range.
It provides full torque even from zero and low speed.
Input power factor is near unity.
It has enough switching levels to enable the use of standard motors while keeping the parts count low.
This allows the use of standard motors up to 6.9 kV, rather than the traditional custom engineered motor, without compromising reliability.
The use of DTC improves process control and lowers energy consumption.
DTC uses motor torque and flux as control variables to achieve higher accuracy.
The overall converter efficiency, including cooling and auxiliaries, is more than 98%.
The IGCTs are used at the heart of the inverter, in a device called the power electronic building block (PEBB).
This replaces complex power electronic circuits with one multi-function device.
By combining several PEBBs, higher voltages can be reached.
The drive does not use any medium voltage power fuses, which can be unreliable, costly and subject to ageing.
If an overcurrent occurs, a small coil senses the fault and responds within 25us.
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