Drives achieve true field orientation without feedback
Second Quarter 2008
Electrical switching & drive systems & components
High-speed stability and accuracy, together with reproducible torque are requirements for motion control in systems manufacturing high-quality products.
From its many years of experience in the development and application of advanced servo systems, German motion control company KEB has developed advanced drive control algorithms which allow it to sense a virtual rotor position within the control software, without requiring an encoder or other feedback sensor on the motor shaft.
The company has developed Combivert F5 sensorless drive solutions for both synchronous (Model SCL) and asynchronous motors (Model ASCL), for applications requiring high speed and torque control. The drives are available in the power range 0,37–900 kW and voltage classes 1/3 phase 230 V, 3 phase 400 V and 3 phase 690 V.
In both versions the current controller provides a load-dependent current supply with high overload capacity, fast correction of load peaks and precise torque control.
Other advantages of these drives include:
* The ability to display speed and torque.
* Reduced costs due to omission of encoder, interface and cable.
* Increased robustness and increased operational reliability, since potential sources of interference from the encoder system are removed.
The SCL version for synchronous motors has been designed for high performance speed and torque control in processes where the system-related advantages of permanent magnet motors can be gained without feedback.
KEB claims that the SCL achieves improved speed stability vs. vector control drives while performing identically to conventional closed loop drives during sudden load variation (See Figure 1). The drive also provides standstill position detection.
Figure 1. The Combivert F5 SCL performs identically to conventional closed loop drives during sudden load variation
The ASCL for asynchronous motors operates with standard drives over a wide power range, for applications requiring consistent speed and torque accuracy. It automatically acquires and models connected motor characteristics to give excellent control. The motor model includes thermal computation.
For more information contact Mike Vernes, Pneumatic Electric Control Systems (PECS), +27 (0)31 303 3701, [email protected], www.pecspower.co.za
Further reading:
Specialised heavy lifting and transport solutions for Singapore’s offshore island
Electrical switching & drive systems & components
A groundbreaking land reclamation project on an offshore island in Singapore has paved the way for the country’s first polder, reclaiming about 800 hectares of land.
Read more...
PC-based control for additive machine tools
Beckhoff Automation
Editor's Choice Electrical switching & drive systems & components
IRPD is a specialist in additive machine tools. Development is heavily focused on high system throughput and consistently high process quality. This goal was achieved with the help of PC- and EtherCAT-based control and drive technology from Beckhoff.
Read more...
Major software release for Parker PSD servo drives
Parker Hannifin - Sales Company South Africa
Electrical switching & drive systems & components
Parker Hannifin has released its PSD servo drive family delivering new control modes, advanced synchronisation functions and performance optimisations designed to improve throughput, accuracy and system efficiency in demanding industrial applications.
Read more...
Beckhoff expands economy drive system
Beckhoff Automation
Electrical switching & drive systems & components
Beckhoff’s new AM1000 servomotor joins the company’s economy drive system. The compact, powerful motor and the AX1000 servo drive provide users with a perfectly coordinated, cost-optimised drive system.
Read more...
Moving next-generation monopiles
Electrical switching & drive systems & components
Wind turbine sizes are increasing at an unprecedented rate. The bigger the turbine, the more power it can generate and the fewer are needed per wind farm. Mammoet has been ahead of the curve in coming up with ways to make the movement of even XXL monopiles faster and more cost-effectively.
Read more...
PC-based control for flat wire motors for electric vehicles
Beckhoff Automation
Electrical switching & drive systems & components
Special machine manufacturer, ruhlamat Huarui Automation Technologies has unveiled the second generation of its mass production line for flexible stators with bar winding (pins). This enables an extremely short production cycle and line changeover times, supported by PC- and EtherCAT-based control technology from Beckhoff.
Read more...
New generation surface drill rig
Electrical switching & drive systems & components
Epiroc South Africa is launching a new and improved PowerROC T45. This new generation surface drill rig offers increased fuel efficiency and high availability, and is a welcome addition to the PowerROC family.
Read more...
Coke drum integrity project at Canadian oil sands site
Electrical switching & drive systems & components
Mammoet supported a leading Canadian energy provider in Alberta’s oil sands with replacing its original eight coke drums.
Read more...
Rip-and-ship solution speeds up nuclear decommissioning project
Electrical switching & drive systems & components
When removing steam generators from decommissioned nuclear reactor buildings, the most economical method is to remove them in one piece. Mammoet was commissioned by Framatome to support with the removal of four steam generators from PreussenElektra’s Nuclear Power Plant Unterweser in Germany.
Read more...
Helping to solve wastewater challenges
Electrical switching & drive systems & components
KSB Pumps and Valves is doubling its efforts to help government and municipalities find practical and technical solutions to the growing wastewater challenges gripping large parts of the country.
Read more...
printer friendly version