Shaft power with maximum speed and efficiency: the electric motor is the workhorse in the turbo compressor and should at the same time be small and light and generate minimal losses.
The torque for Celeroton’s electrically driven turbo compressors is generated in an electric motor based on the electromagnetic principle by means of Lorentz forces and reluctance forces. Celeroton exclusively employs direct drives operating at the speed of the compressor impeller without gearboxes. Due to the high efficiency and torque density of the permanent magnet synchronous machines (PMSM), Celeroton works exclusively with this motor topology, which is also known as a brushless DC motor in smaller machines. With this type of electric motor, one or more permanent magnets are mounted onto the rotor. The resulting magnetic field interacts with the stator magnetic field generated by the stator currents (reluctance force) or, in the case of Lorentz force, directly with the stator currents. There are two types of stator, slotless and slotted, both employed by Celeroton depending on the requirements and the system design.
Celeroton uses its proprietary as well as commercially available design software for the electromagnetic design. The design software includes an optimization for low copper, iron and rotor losses, a low weight, a small rotor diameter – for mechanical and rotor dynamics reasons – and a higher power factor to keep the required converter power low. The motor design is optimized for series production.
For a given speed, the power limit is determined based on the selected machine concept, the materials used, the rotor dynamics and the thermal limits. Celeroton motor technology aims to come as close to these technical limits as possible.