The drive system (including the electric motor and its controller) is the heart of electric vehicles (EV). For EV motor drives, both high-torque low-speed hill climbing and low-torque high-speed cruising are specially required. To meet this, a new multiphase surface-inset PM brushless motor drive is proposed in this paper which has the characteristics of dc series motors and the advantages of permanent magnet (PM) brushless motors. The special new and exciting advantage that the air-gap flux of the motor is generated by both the PM excitation and specially controlled stator currents (two particular phases) under the same PM pole. Hence, the torque of the motor is composed of two parts. One part is the PM torque produced by interaction between the PM excitation and the two-phase stator currents. Another part is the electromagnetic torque produced by interaction between the magnetic field generated by the twophase stator currents and the stator currents of other phases. As this part of torque is approximately proportional to square of the phase current, it offers the characteristics of a dc series motor. Therefore this novel motor drive possesses complex characteristics of PM brushless motors and dc series motors. It offers high power density, high efficiency, high starting torque, wide adjustable speed range in constant power operation, and mechanical robustness. The unique motor configuration and principle of operation are introduced in the paper. The magnetic field distribution and the steady-state performance are analysed by finite element method. The experimental results of a five-phase prototype motor verified that proposed motor drive is promising for modern electric vehicle applications.
A new surface-inset permanent magnet motor drive for electric vehicles
Ein neuartiger, oberflächengekapselter Permanentmagnet-Motor als Antrieb für ein Elektrofahrzeug
1999
10 Seiten, 9 Bilder, 2 Tabellen, 7 Quellen
Conference paper
English
A new surface-inset permanent magnet motor drive for electric vehicles
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