Abstract
This paper presents the control strategies for a novel dual-stator flux-modulated (DSFM) motor for application in electric vehicles (EVs). The DSFM motor can be applied to EVs because of its simple winding structure, high reliability, and its use of two stators and rotating modulation steels in the air gap. Moreover, it outperforms conventional brushless doubly-fed machines in terms of control performance. Two stator-current-oriented vector controls with different excitation in the primary winding, direct and alternating current excitation, are designed, simulated, and evaluated on a custom-made DSFM prototype allowing the decoupled control of torque. The stable speed response and available current characteristics strongly validate the feasibility of the two control methods. Furthermore, the proposed control methods can be employed in other applications of flux-modulated motors.
Highlights
With the emergence of an energy crisis, ways of reducing air-pollution have become the great challenge [1]
The wide speed range of the dual-stator flux-modulated (DSFM) motor can be achieved without flux-weakening control such that the copper loss can be reduced and the efficiency can be increased at a high speed compared with permanent magnet synchronous motors (PMSMs)
This study explored and investigated the control strategies for the application of the DSFM motor to Electric vehicles (EVs)
Summary
With the emergence of an energy crisis, ways of reducing air-pollution have become the great challenge [1]. Electric vehicles (EVs) contribute significantly to energy saving and environmental protection, and on account of these benefits, they constitute today’s direction for the automotive industry [2]. A compact and highly-reliable electric traction motor, which has high efficiency over a wide speed range with load-adaptive controllable speed-torque contours, is crucial for any electric propulsion system [3,4]. Traction motors of EVs should have high torque density in terms of weight and volume, a wide range of torque-speed characteristics, high operating efficiency, and high reliability. The novel structure of a brushless, doubly-fed generator (BDFG) proposed in [5], which has the aforementioned advantages, can be efficiently applied to EVs. To distinguish the different applications of such machines, the concept of dual-stator flux-modulated (DSFM) motors for EVs was presented
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