At present several motor topologies can be used as exclusive drive in full-size electric vehicles. Mainly for two reasons is the separately excited synchronous motor (SSM) particularly interesting for electric cars. First of all, it does not contain any rare earth permanent magnet. Secondly, the possibility of determining the rotor current significantly improves the regulation freedom of the motor with the result of an excellent power factor, an excellent peak power density and an optimized efficiency especially at low torque. The analysis of a conventional car drive cycle clearly shows this is exactly what is needed by an electric vehicle which requires a high peak power for driving pleasure (fast accelerations) but a very low average power. However, this motor topology requires an energy transfer system to feed the rotor coil with an appropriate current. To obtain this goal carbon brushes combined with slip rings are usually employed. These elements are prone to wearing and produce dust inside the motor. To solve this problem and in particular to guarantee a long-life motor it is necessary to design a rotating transformer to contactless transfer energy to the rotor coil. BRUSA Elektronik AG is developing a current excited synchronous motor that follows these principles. A brush-based version has been already developed. For winter 2014 an improved version with inductive energy transfer will be available.
Design of a brushless separately excited synchronous motor
2013
6 Seiten, 2 Bilder
Aufsatz (Konferenz)
Englisch
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