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The synchronous reluctance machine (SynRM) can be considered as a viable alternative to permanent-magnet synchronous machines and induction machines. The absence of permanent magnets or excitation windings are advantages. Additionally, higher efficiencies respectively torque densities are possible compared to induction machines. Lower power factors (typically less than 0.7–0.8) and therefore larger...
This paper focuses on the design process of a direct drive motor which is to be installed within the wheel rim of a light electrical vehicle. The work starts with the set of requirements, considering space and mass restriction, torque capability and cycle efficiency. Next it is discussed in what manner the design goals are conflicting, alluding to the tradeoff between high torque density and efficiency...
This paper focuses on the design of bearingless high-speed switched reluctance motors with single layer windings based on their special characteristics, which are different from normal switched reluctance motors and other types of bearingless motors. The design begins with calculating magnetic air gap considering influences of eccentric forces. Then winding number and winding maximal inductance are...
Circumferential cooling as inexpensive but highly effective cooling technique for machines with high torque density is compared to water jacket cooling in terms of compactness and power efficiency of the resulting motor. Technological aspects are discussed, and simple mathematical introduction to this comparison is given. A particular traction motor with water jacket cooling is then compared to a...
In parallel to their dynamic duty synchronous generators must be capable of bearing permanently an additional negative sequence current of up to 10% of the rated current according to the IEC 60034-1 standard. On turbine generators this does not only charge the damper winding but causes eddy currents and losses in the solid rotor iron in parallel. The complex current distribution cannot yet be satisfactorily...
Electrical drives employing motors able to directly manage multiple degrees of freedom may result in relevant interest in several application fields, e.g. robotics and tooling machines. In this paper, a new type of rotary-linear permanent magnet motor with one motion of two degrees of freedom has been proposed. Its main performance advantage is its characteristics of decoupling linear and rotary motions...
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