A new control algorithm for Danfoss VLT frequency converters now opens up for synchronous reluctance motors. High-efficiency synchronous reluctance is one of the newly emerged motor technologies offering optimum energy utilisation. At the same time, it is a robust technology and maintenance requires little effort, so all in all it demonstrates impressively low return on investment times.
When the diverse motor technologies within one plant are controlled by a single drive platform, the designer has full liberty to install the best value motor for each application. At the same time costs are reduced for both storage and training in operation of the frequency converter. And updating the system with the new motor technology is an easy retrofit, as no exchange of the drive is required. These advantages are precisely the benefits VLT frequency converters offer. The VLT AutomationDrive is able to control a wide variety of motor types, now including synchronous reluctance. Control not only involves operating the motors using advanced Voltage Vector Control, but also the full realisation of the efficiency advantages. This realisation is possible due to specially adapted algorithms for operation at the optimum operating point.
With the new Danfoss firmware for synchronous reluctance, commissioning is as easy as for a standard AC asynchronous motor. The installer has to enter only four motor parameters. The automatic motor adaptation for synchronous reluctance motors takes only 2.7s to measure the motor characteristics and optimise the motor parameters. The motor then operates at the highest possible energy efficiency, for lower energy consumption and reduced running costs. Danfoss’ “One VLT for all motors” approach is different to that of competitors, because it enables motor independence including synchronous reluctance at no extra cost, whilst still ensuring optimal performance. The same frequency converter can be configured for operation of standard asynchronous machines, permanent magnet and synchronous reluctance motors, and even existing installations can be upgraded with the new software.
To learn more about Danfoss VLT frequency converters, please go to www.danfoss.co.uk/vlt.