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Investigation of an Electrically Excited Vernier Machine with a Concentrated Winding intended for Traction Applications

Low voltage traction applications demand high torques at low speeds and at a small design space. In order to achieve high torque densities, manufacturers often combine high-speed machines with mechanical gearboxes. In the past decade, flux modulation machines came up, offering low speeds and high torque densities by utilizing the magnetic gearing effect. Actually, the already investigated machines of this type are mostly permanent magnet or hybrid machines. However, the price and the field weakening capability rise the interest in electrically excited machines. Therefore, this paper explores the concept of an electrically excited Vernier machine and compares the benefits and drawbacks to an electrically excited synchronous machine. Furthermore, the investigated concept is compared to equivalent PM machine concepts.