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Converters - also called alternating current converters or AC/AC converters - are devices that turn a DC voltage into an AC voltage with a different frequency and amplitude. They are therefore playing an increasingly important role in electromobility, because they can help convert the charged direct current into alternating current more effectively. Swiss company Celeroton AG is a pioneer in this field. The high-tech company is a leading manufacturer of ultra-high-speed electric drive systems and turbo compressors with rotational speeds of up to one million revolutions per minute.

Celeroton is now unveiling the CC-550-7500, a special converter for controlling compressors in fuel cell systems. Like all the company's converters, it supports sensorless control of permanent-magnet synchronous machines (PMSM) and brushless DC motors (BLDC). The option of tuning the modulation and control system to virtually any electric machine is designed to maximize converter efficiency while also minimizing motor losses. This means both pulse-width modulation (PWM) with varying switching frequencies and pulse-amplitude modulation (PAM) are possible in the same device. What's more, thanks to PAM technology, there is no need for an output filter between the motor and converter. In addition, a sensorless control method developed in-house enables the speed to be controlled without any encoder or Hall sensors. Auto tuning, automatic controller parameterization and support from trained Celeroton engineers take quick and easy commissioning to a whole new level.

Celeroton AG (8604 Volketswil, Switzerland)
Website: www.celeroton.com