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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...
The doubly-fed induction generators operating at synchronous speed offers some advantages. At this working mode, the power flowing in the rotor is not significant and thus the converter rating is reduced considerably. The drive can be implemented with the support of a hydro-dynamically controlled gearbox (Voith) which allows the generator works at a determined speed regardless of the rotor speed....
In this paper the authors introduce a type of transverse flux reluctance machines (TFRM) in a special lightweight construction method with a disc-shaped rotor. The device uses soft magnetic composites (SMC) for the magnetic circuit, which allows complex stator geometries. Basic design principles concerning the magnetic circuit, torque and power output are described. A crucial point in this paper is...
This paper presents the effect of energy efficient control strategies on positioning processes of induction motor servo drives. In comparison to conventional trajectories that operate at constant rated flux optimized motion and flux trajectories lead to a significant reduction of energy losses in the drive system.
This paper shows that winding drives in combination with a continuous variable transmission (CVT) will lead to reduced rated power as well as an increased efficiency of the electrical drive. First practical experiments with imitation of a winding operation were performed to verify the theoretical investigations.
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...
Servo drives comprise a significant potential of energy saving which has not been considered sufficiently up to now. Simple changes in the motion control of energy optimal and jerk limited motions can be implemented which lead to a reduced acceleration rms-value and slightly increased maximal acceleration. The resulting reduction factors for dimensions and moved masses lead even to further savings...
Super high-speed and high-power electric machines are required for turbomolecular pumps and spindle drives. High rotational speed and high power drives can be achieved with bearingless motors. In the paper a novel switched reluctance bearingless motor (SRBM) with principles of traditional switched reluctance motors is proposed and its performance characteristics are analysed. Its main difference from...
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