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The paper develops an analytical evaluation of the torque and of the losses in a metallic shell, used as separator and/or retaining cup of Permanent Magnets (PM) in Dual Mechanical Port Machines (DMPM) for pump drives. The DMPM disposition assures a mechanical driving back up in case of electrical failure; moreover, the adoption of a separator allows to avoid the use of stuffing boxes, reducing the...
The paper deals with some features concerning the design of a high speed brushless PM micro-motor. Some configurations are considered and analyzed, both for the magnetic structure and for the windings; on the basis of the performances and the manufacturing process, the best solutions are chosen. Losses, in case of PWM supply, are evaluated by FEM simulations, and a temperature analysis is performed...
The phenomenon of the unbalanced magnetic pull is analytically modelled, referring to cylindrical rotor A.C. machines. Even if under some simplifications (sinusoidal space distribution of the current density, no slotting, no saturation, no parallel paths), various compact and significant expressions of field and force are obtained, for any number of pole pairs: the model is based on a critical re-formulation...
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