Power electronics

Low losses in converter and motor: power electronics demonstrates not only individual responsibility but is a strong team player.

Two-stage voltage source inverters in combination with pulse width modulation (PWM) are the standard for speeds of up to several thousand revolutions per minute (rpm). For applications with speeds of up to several hundred thousand revolutions per minute and/or extreme motor efficiency requirements, other converter topologies and modulation methods may be considered. These include voltage source inverters with an additional DC-DC converter stage, in which the inverter is operated with block commutation, also known as pulse amplitude modulation (PAM). Further advanced topologies and modulation methods are used to integrate the power electronics into a turbo compressor housing. Celeroton’s approach to system design, including motor and converter, enables optimal selection and coordination of the power electronics topology, modulation method and motor topology.

Celeroton’s power electronics and modulation technology are optimized for the electric motors installed in Celeroton turbo compressors, especially for the lowest rotor and converter losses at the highest speeds. This results in the highest power densities in the system.

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Compressor
Tech

Novel high-speed turbo compressor with integrated inverter for fuel cell air supply

Fuel cell technology is continuously gaining ground in E-mobility applications. Fuel cells require a constant supply of pressurized air, for which high-speed turbo compressors with air bearings are an optimal choice to reduce size, guarantee oil-free operation required for the lifetime of the fuel cell, and increase efficiency.

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Compressor
News

Combining electronics and a turbo compressor in one device - the new CTi-17-700/1000.GB

Electrification in various industries, especially in mobile applications and vehicles, is more and more driven by hydrogen fuel cell systems. Celeroton’s latest achievement helps to further reduce the size of the fuel cell system and simplify the integration of the compressor into the balance of plant, and, therefore, supporting the worldwide trend.

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Converter
Paper

Modeling and Comparison of Machine and Converter Losses for PWM and PAM in High-Speed Drives

In this paper, models are introduced for calculating the rotor, copper, and core losses of an electrical machine as well as inverter losses, taking the modulation type into account. These models are developed by considering two typical high-speed permanent-magnet synchronous motor topologies (slotted and slotless machines) driven by pulse-amplitude modulation (PAM) and pulsewidth modulation (PWM) converters.

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Motor
Paper

Model-Based Loss Minimization in High-Speed Motors

The trend to higher rotational speeds in drive systems possesses several challenges, one of which is the thermal constraints due to the higher loss densities in the electrical machines. In this paper, loss models are used to evaluate different converter modulation schemes as well as changes in the machine construction, in order to find a loss-optimal drive system.

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