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The cogging torque in the interior permanent magnet synchronous machine(PMSM) leads to mechanical resonance, vibration, and noise, which would reduce the control accuracy of the machine. It is important to calculate the cogging torque of the interior PMSM. Up to now, there is no accurate calculation method of the cogging torque for the interior PMSM, and the accurate calculation relies on the Finite...
In the process of designing an electric machine, the systematic study of tolerances for the design variables and material properties is of the utmost importance. This paper proposes a method by which possible variations of the design variables and material properties can be distinguished. The design of experiments (DOE) technique, open-circuit and short-circuit tests, with minimum instrumentation...
Axial Flux Permanent Magnet (AFPM) motors are suitable options for solar powered vehicles due to their compact structure and high torque density. Furthermore, in NS-type APFM machines, the magnetic stator core may be eliminated, which simplifies the manufacturing and assembly. This paper examines two different machine designs for use in the solar powered vehicle of the challenger class — a single...
This paper proposes alternate bridge core of the Concentrated Flux-type Synchronous Motor (CFSM) using ferrite permanent magnets for automotive chassis actuator. The advantage of this structure is the reduction of leakage flux in the rotor bridges. Therefore, torque is enhanced in the safe mechanical structure. It is analyzed under the conditions of the constant volume of the PMs as well as the constant...
Coreless axial flux machines with airgap concentrated windings are of interest due to their high torque density. One of the main challenges with such a winding is that the torque producing MMF component that corresponds to the fundamental of the permanent magnet excitation is accompanied by harmonics. At least one of them is of substantial amplitude. The other harmonics are asynchronous and cause...
This paper presents the design considerations of a double-sided transverse flux machine (TFM) for direct-drive wind turbine applications. The TFM has a modular structure with quasi-U stator cores and ring windings. The rotor is constructed with ferrite magnets in a flux-concentrating arrangement to achieve high air gap flux density. The design considerations for this TFM with respect to initial sizing,...
This paper presents the design and analysis of a zero cogging halbach array permanent magnet Brushless DC motor (PMBLDC) meant for spacecraft applications. The design of the zero cogging BLDC motor requires the choice of slotless configuration. Three types of machine configurations, Slotless PMBLDC with radial, parallel and halbach magnetization were compared and analyzed using analytical models....
This paper introduces a new air-gap structure, the slanted air-gap, for increasing the speed limit of an interior permanent magnet synchronous motor (IPMSM) for application in a hybrid electric vehicle. This unique slanted air-gap is intended to maximize the ratio of the back-emf of a machine that is controllable by brushless field excitation (BFE). The BFE structure offers high torque per ampere...
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