PRODUCTS DRIVES, CONTROLS & MOTORS
HIGH PERFORMANCE AC MICRO-DRIVES INTRODUCED
New from Yaskawa, the GA500 Variable Speed Drives are said to combine valuable functions and features to provide important benefits through the whole lifecycle of a machine or installation. Compact in size, these AC Micro-drives offer
flexibility in terms of connectivity, are designed to handle nearly any application, and enable users to run any motor type from 0.2 up to 30Kw. These feature integrated EMC filters,
embedded dual channel safety (STO SIL3/PLe), one fieldbus card to network five drives, the ability to meet all global standards, along with safe, convenient set-up and monitoring, with apps for all mobile devices. The drives can operate up to 4000m altitude and in environments up to 60˚C. Furthermore, coated PCB’s protect against dust and mist, while integral temperature controlled fans run only when needed. In addition, a bright LED display and tactile keypad ensures easy and intuitive
navigation through menus. An embedded programming environment for customising drive functions means scalability and the potential to replace the need for external controllers; while the USB port means easy connection to a PC or mobile device for programming, monitoring or trouble-shooting. Easy-access terminals ensure fast connection of mains and motor cables without the need to remove any cover. The internal 24VDC power supply sensors deliver an extra 150mA for use with
external sensors and, as the drive is optimally rated, normal duty rating allows users to run one size larger motor in variable torque applications.
Yaskawa
A NEW RANGE OF HIGH SPEED BRUSHLESS DC SLOTLESS MOTORS
New to Portescap’s Ultra EC range of brushless DC slotless motors is the 35ECS, a two pole motor which offers ultra high speed and power (up to 330W, max continuous) with smooth operation and long life. Available in two lengths – the 35ECS60 and the 35ECS80 –
these feature the company’s patented Ultra EC coil technology, as well as its high-speed rotor design to sustain speeds up to 40,000rpm. The 35ECS80 is said to offer impressive torque capabilities at very high speeds, while the 35ECS60 allows high speed capabilities at very low voltages. The new 35ECS motors feature a laser welded
front flange to ensure the strongest housing to sustain high torque reaction. A temperature probe on the coil head ensures optimised control of motor performances in heavy duty applications. These motors are offered with hall sensors and a total of six different coils to match the user’s speed and voltage requirements. Upon request, Portescap can also provide options for customisation including gearboxes, encoders, coil variations and mechanical interface modifications.
www.yaskawa.eu.com Portescap T: +41 (0) 32 925 6111
DRIVE CONTROLLERS AND SINE-WAVE FILTERS CONTROL ENERGY FLOW IN NEW FLYWHEEL ENERGY STORAGE UNITS
An appropriate form of storage is essential for the efficient and optimised use of electricity generated from renewable energies. In the recently developed EnWheel flywheel energy storage units from Stornetic, COMBIVERT F6 drive controllers from KEB control the energy flow together with specially developed sine-wave filters. Leitmarkt Agentur NRW achieved this with
the help of the EU-funded Quirinus project, which focuses on developing sustainable security of supply. This is ensured by high and efficient system stability in increasingly decentralised generation plants that feed their power into the grid on a fluctuating basis. The surplus energy is stored in electrochemical storage systems (LiIon/SuperCap) or as kinetic energy in flywheels. These forms of storage are particularly attractive in order to absorb peak loads and therefore keep the supply network constant. Flywheel energy storage units (see diagram) are particularly suitable for ensuring consistent capacity over many charge and discharge cycles. Stornetic develops and produces storage systems of this kind with DuraStor. In the event of an energy surplus, the EnWheel accelerates an active
magnetically mounted carbon-fibre rotor up to 45,000 revolutions per minute. The drive is disabled for interim storage of rotational energy (IDLE mode). As the rotor rotates freely in a vacuum, there are virtually zero friction losses. If energy is required, the drive synchronises to the rotating rotor and feeds the ‘braking energy’ back into the network. In addition to shutdown and synchronisation on the rotating rotor,
the cooling of the motor with low heat transfer in the vacuum is one of the particular challenges. In the new generation of flywheel energy storage units, KEB
20 JUNE 2019 | DESIGN SOLUTIONS
COMBIVERT F6 drive controllers function in combination with specially developed sine-wave filters to control the energy flows. The efficiency optimisation in the overall system is based on an ideally tailored package consisting of a drive controller, sine-wave filter and synchronous motor in the EnWheel with minimised harmonic content (THD) and therefore the lowest electrical losses on the rotor side of the drive. The Speed Search function, which is further
optimised by its use in the F6 drive controller, is responsible for the load application and release of the flywheel rotor in ‘IDLE Mode’, which ensures an immediate connection to the rotating rotor up to maximum speed. Due to the possible load release in this mode, the complete
switching losses of the IGBTs in the drive controller are eliminated for yet another contribution to better energy utilisation. Fields of application are increasingly created by the concept of ‘microgrids’ to compensate for peak loads and thus the stabilisation of local grids. This solution offers a number of benefits:
• System solution with drive controller and sine-wave filter for THD values <1.5%
• ‘IDLE Mode’ via Speed Search function up to 45,000 revolutions per minute. • Operation of the motor with optimised switching frequency at output frequencies up to 750Hz.
• Optimum overall efficiency. • Fast response times and high power gradients without diminishing performance over the entire service life of the system.
KEB Automation
www.keb.co.uk
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