Title :
Variable-frequency synchronous motor drives for electric vehicles
Author :
Chalmers, Brian J. ; Musaba, Lawrence ; Gosden, David F.
Author_Institution :
Dept. of Electr. Eng. & Electron., Univ. of Manchester Inst. of Sci. & Technol., UK
Abstract :
The performance capability envelope of a variable-frequency, permanent-magnet synchronous motor drive with field weakening is dependent upon the product of maximum current and direct-axis inductance. To obtain a performance characteristic suitable for a typical electric vehicle drive, in which short-term increase of current is applied, it is necessary to design an optimum value of direct-axis inductance. The paper presents an analysis of a hybrid motor design which uses a two-part rotor construction comprising a surface-magnet part and an axially laminated reluctance part. This arrangement combines the properties of all other types of synchronous motor and offers a greater choice of design variables. It is shown that the desired form of performance may be achieved when the high-inductance axis of the reluctance part is arranged to lead the magnet axis by 90° (elec.)
Keywords :
electric propulsion; electric vehicles; inductance; machine theory; permanent magnet motors; rotors; synchronous motor drives; axially laminated reluctance; direct-axis inductance; electric vehicles; field weakening; hybrid motor design; permanent-magnet synchronous motor drive; surface-magnet; two-part rotor construction; variable-frequency synchronous motor drives; Electric vehicles; Frequency; Hybrid electric vehicles; Inductance; Permanent magnet motors; Reluctance motors; Rotors; Stators; Synchronous motors; Voltage;
Journal_Title :
Industry Applications, IEEE Transactions on
