Consequent-pole brushless machines featuring uneven magnet-pole width ratio

Permanent magnets synchronous machines are used in many different applications. While the popular surface magnets isotropic variant is the simplest to manufacture and control, its relatively low airgap flux density limits the specific performances that are further reduced when a bandage is used to retain magnets. The different buried magnets variants may be tailored to improve the most relevant aspects, yet resulting more complex and expensive with a less robust rotor core. Inset magnets machines may constitute an interesting intermediate solution. In particular, the consequent pole variant features a simple and robust structure with some design flexibility. This paper investigates the opportunity to design consequent-pole machines featuring rotors with different pole and magnet angular width, aiming to improve the specific performances by better exploiting the potential of silicon steel laminations.