The new U1000 matrix converter from Yaskawa enables asynchronous or synchronous machines to be driven effectively, while at the same time ensuring the energy-efficient recovery of excess braking energy. Unlike in conventional inverter drives, Yaskawa has opted for a technology that is barely used in low voltage applications but which boasts some extremely interesting benefits.
The U1000 matrix converter from YASKAWA is a highly-efficient, regenerative direct converter for driving asynchronous and PM machines with or without a speed sensor. Different models cover a broad output range from 2.2 to 500 kW.
Unlike traditional recovery solutions, the U1000 functions without a DC bus, and switches the three phases of the network directly to the motor winding.
The mains currents during operation of the U1000 are virtually sinusoidal, both in motor and regenerative operation. Harmonics are reduced to a minimum. This means that losses in network components, such as transformers or cables and lines, are reduced and enables the efficiency of a system to be increased.
Moreover, the level of interference with other system components is also reduced considerably. Failures which are typically very time consuming to troubleshoot are therefore prevented, increasing system availability. An EMC filter is integrated into the U1000. External, otherwise customary components, such as DC reactors or LC filters, are not required.
In spite of this, it requires up to 50% less space than conventional integrated solutions with sinusoidal feed and recovery. When replacing 12-pulse systems, for example, with the new matrix converter, the ratio shifts even further in favour of the U1000. Eliminating external components not only simplifies the system structure but also means that the converter is extremely quick and simple to install.
Integrated energy-saving recovery
As the U1000 operates without a DC bus, it automatically returns regenerative energy back to the grid. This means that excessive braking energy can be reused, thereby directly reducing the energy requirements of the system. This aspect is particularly important in these times of rising energy costs. Furthermore, regenerative resistors and choppers are no longer required. This simplifies or even eliminates the need for system cooling or ventilation, resulting in further savings.
The U1000 features a built-in SIL3 STO input and therefore aids the simple implementation of high machine safety requirements using only a small number of components. Option boards are available for all common fieldbuses, making the connection to EtherCat, Powerlink, Profinet, Profibus, Ethernet IP and other systems extremely simple.
The U1000 offers a new – and therefore interesting – solution for all application areas in which energy efficiency and smooth operation are priority and/or in which there are large amounts of excess braking energy. The U1000 enables considerable savings potential to be achieved with very little effort in applications such as fans and centrifuges, passenger and goods lifts, cranes or escalators, to name just a few.
For more information, please visit http://www.yaskawa.eu.com.