New generation motor control platform promises greater speed and torque control

12 August 2014

ABBs direct torque control (DTC) motor control platform, which is used in the company’s variable-speed drives, has been improved to bring higher accuracy in motor speed and torque control, as well as the ability to control more motor types.

This fourth generation DTC is said to offer enhanced performance in open and closed loop and a higher switching frequency. Speed and torque control accuracy have been improved, for both dynamic and static values. 

Support for high-speed motors up to 500 Hz and absolute encoder and resolver support are provided, while other improvements include more choice of identification (ID) set-up runs.

Drives equipped with the new DTC can now respond more quickly to changes in the customer speed reference, with the motor shaft responding within 2ms of a reference change instead of 10ms.

DTC allows users of the latest ABB industrial drives to control any motor type without a change to the firmware, making it practical to use squirrel cage, permanent magnet and ABB’s advanced synchronous reluctance motors. 

With DTC, field orientation is achieved without feedback, using advanced motor theory to calculate the motor torque. DTC uses fast digital signal processing hardware and an advanced mathematical understanding of how a motor works. The result is said to be a drive with a torque response that is typically ten times faster than any AC or DC drive. The dynamic speed accuracy of DTC drives will be eight times better than any open loop AC drives and comparable to a DC drive that is using feedback, claims the company.

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