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DRIVES & CONTROLS Brushless DC tachometer monitors industrial motor speed ServoTek Products’ TachSyn Series of brushless DC tachometer/ commutator may be used as either a brushless DC tachometer or brushless DC motor commutator for monitoring the rotational speed of brushless industrial DC motors. The unit offers an economical solution to many velocity-loop problems, whether brushless or standard servo. The robust design of the ServoTek Products TachSyn transducer consists of a primary magnetic sensing device, in which output windings, field winding, and a permanent magnet are all co-located within the stator itself, maximizing reliability. The transducers are available in several unique models to commutate 4-, 6-, or 8-pole brushless DC motors. Any sized TachSyn tachometer may be specified in applications where a simple DC tachometer signal is the only requirement. Pancake-shaped TachSyn transducers are easily mounted, cantilever- style, to the back of a motor or other device, with synchro-type adjustment for phasing. Each TachSyn transducer requires one CT-4 Series circuit board (or a customer-supplied equivalent), as well as a connecting cable with double-barreled shield to complete signal conditioning. The CT-4 circuit board provides AC field excitation for the transducer and conditioning for its output signals, which include a linear low-ripple DC tachometer voltage, and either a Hall-equivalent or sine-wave commutation signal. ServoTek Products www.servotek.com Compact single channel gate driver focuses on applications up to 1200-V Infineon Technologies’s 1EDI EiceDRIVER compact single channel gate driver support applications with isolation voltages of up to 1200 V. The galvanically isolated driver components are based on the Coreless Transformer Technology developed by Infineon, which enables output currents of up to 6 A on separate output pins. The basic system includes UVLO (under voltage lockout) for IGBTs and MOSFETs as well as an active shutdown in the event that the driver is not connected to the power supply. The 1EDI drivers are supplied in a compact DSO-8 housing and can be used at ambient temperatures of up to 125°C. The 1EDI driver ICs are offered in eight variants that can be operated at up to voltages of 1200 volts and are designed for use in applications with either IGBTs or MOSFETs. The new EiceDRIVER components claim to be the first driver ICs to achieve a value of 100 kV/μs for the CMTI (common mode transient immunity). Both the MOSFET as well as one IGBT driver supply 6 A of output current. The MOSFET driver is optimized for use with power semiconductors that are based on CoolMOS technology. Owing to lower induction loss, the EiceDRIVER enables an additional gain in efficiency of 0.5 percent with the latest generation CoolMOS C7. Further IGBT only variants with 4, 2 and 0.5 A are in preparation. The five variants have a separate output for charging and discharging the gate. Infineon Technologies AG www.infineon.com Diagnostic software monitors PROFINET networks The PROFINET Diagnostics Suite from Softing offers extensive features to support the analysis of the network status as well as for early error detection and correction. The software includes several methods for viewing and analysing the network communication, and supports passive, active, and offline monitoring principles. The Identification & Maintenance (I & M) information supports the maintenance personal in identifying and replacing malfunctioning devices. Last but not least, the software maintains a list of communication events. Each event is hyperlinked to the according data frame for quick reference. Softing Industrial Automation industrial.softing.com Backward-compatible, high-bandwidth CAN bus version As an intermediate step on the transition to the high-performance CAN bus version with flexible data rate (CAN-FD), Swedish technology company Kvaser AB has presented a new CAN version, dubbed CAN-EF (Enhanced Format). The beauty of CAN-EF: Unlike CAN-FD, it offers higher bandwidth without giving up backward compatibility. As automotive software applications require more bandwidth for data communications among ECUs inside the car, a new, speedier version of the venerable CAN bus is currently under development by CAN inventor Bosch GmbH. This version, CAN FD, will provide a highly efficient method of increasing CAN data throughput, by increasing the number of bytes in each CAN frame (from 8 to 64 bytes), whilst making the CAN frames shorter. However, this technology is not compatible with existing CAN controllers; systems and modules have to be re-designed. At the 14th International CAN Conference in Paris, Kvaser pressed ahead by introducing CAN-EF. This version achieves higher data rate communication than CAN by packing the extra bits into the CAN-frames in such way that they can be received by legacy CAN controllers, ensuring backwards compatibility with existing CAN infrastructure. According to Kvaser president Lars-Berno Fredriksson, CAN-EF could facilitate the industry’s move to CAN-FD. Since the development and standardization of CAN-FD is expected quite a while - currently the flexible data rate CAN is in the process of being integrated within ISO 11898-1 - CAN-EF could give CAN users quicker and simpler access to greater data rates in the meantime. The performance of CAN-EF would be within the range of 50-90% of CAN-FD in similar circumstances. CAN-EF works by hiding the high-speed data from the legacy CAN modules, allowing CAN-EF modules to be installed into any system to communicate at a higher bit-rate without interfering with any connected CAN module in use today. In truck applications where J1939 is employed at 250 kBit/s, CAN-EF would facilitate an increase in data throughput, without altering the basic bit rate. Kvaser AB www.can-cia.org 36 Electronic Engineering Times Europe December 2013 www.electronics-eetimes.com


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