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.

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:

Next-generation oil-free motor systems with active magnetic bearings
Electrical switching & drive systems & components
WEG and SpinDrive are collaborating to integrate SpinDrive’s AMBs and built-in IoT condition monitoring into WEG’s market-leading electric motor offering, creating an oil-free, maintenance-free drive solution.

Read more...

---

Direct drive with integrated control
Vepac Electronics Electrical switching & drive systems & components
The PSD 40 direct drive is a mechatronic system with integrated control, bus interface and absolute measuring system, with no battery required.

Read more...

---

AI-powered on-premises analytics for industrial drives
Siemens South Africa Electrical switching & drive systems & components
Siemens is introducing a new on-premises analytics solution for industrial drive systems. The software enables users to evaluate drive data entirely within their own infrastructure and meet stringent data-sovereignty requirements.

Read more...

---

Hydrostatic machine base for ultra-precision grinding centre
Electrical switching & drive systems & components
Hyprostatik Schönfeld has developed a high-precision hydrostatic machine base for a new ultra-precision grinding centre for Optotech. The machine platform enables a previously unattainable combination of dimensional accuracy, dynamics and surface quality in the ultra-precision grinding of optical surfaces.

Read more...

---

Innovative drive system for smart logistics
Horne Technologies Electrical switching & drive systems & components
With its new DualGear, Faulhaber presents a high-performance drive system with high dynamics, robustness and precision in a compact, diameter-compliant design.

Read more...

---

Proportionate specification for hazardous locations
Electrical switching & drive systems & components
As automation spreads deeper into processing, handling and transport operations, motors are increasingly required to operate in spaces that sit on the edge of hazardous zones.

Read more...

---

Redefining compact motorsport driving simulators
Electrical switching & drive systems & components
Leading driver-in-the-loop simulator manufacturer, Ansible Motion has introduced the Delta T1 Sport, the first in a new class of motorsport simulators that offers high-fidelity dynamics, ultra-low latency and a fully immersive experience, all within a compact footprint and accessible price point.

Read more...

---

The shopping cart that knows the way
Horne Technologies Electrical switching & drive systems & components
How can visually impaired and blind people shop independently in a supermarket? VIRAS supplies the answer: an autonomous shopping cart developed at the Eastern Switzerland University of Applied Sciences.

Read more...

---

Loadcells for maximising conveyor belt performance
Electrical switching & drive systems & components
Loadtech’s ViewIT loadcell platform can transform the way operations monitor, manage and maximise conveyor belt performance.

Read more...

---

Rapid headframe replacement for Canada’s biggest potash mine
Electrical switching & drive systems & components
Mammoet has supported Ledcor with the construction of BHP’s new Jansen potash mine.

Read more...

---