Title :
Variable-frequency synchronous motor drives for electric vehicles
Author :
Chalmers, B.J. ; Musaba, L. ; Gosden, D.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 :
design engineering; electric propulsion; electric vehicles; machine theory; optimisation; permanent magnet motors; permanent magnets; rotors; synchronous motor drives; axially laminated reluctance; design optimisation; direct-axis inductance; electric vehicles; field weakening; hybrid motor design; performance characteristic; permanent magnet synchronous motor drive; surface magnets; two-part rotor construction; Electric vehicles; Frequency; Hybrid electric vehicles; Magnetic flux; Magnetic separation; Permanent magnet motors; Reluctance motors; Rotors; Synchronous motors; Torque;
Conference_Titel :
Industry Applications Conference, 1995. Thirtieth IAS Annual Meeting, IAS '95., Conference Record of the 1995 IEEE
Conference_Location :
Orlando, FL
Print_ISBN :
0-7803-3008-0
DOI :
10.1109/IAS.1995.530370
