This article introduces a novel algorithm for suppression of phase current harmonics in three-phase sinusoidal surface-mounted permanent magnet synchronous machines (SPMSMs) caused by nonideal back EMF waveform and dead time effects. Proposed feedback acquisition chain obtains an exact information on all the relevant within each period fundamental. Design harmonic controller based internal mode...

A hybrid-excited doubly salient dual-PM machine (HE-DSDPM) was presented by using the structural multi-tooth modification for an improvement of torque production. The structure HE-DSDPM clearly described. PM and stator arcs were further examined optimization. electromagnetic performance including magnetic flux distribution, linkage, back-electromotive force (back-EMF), total harmonic distortion...

To get a better electromagnetic performance of an axial flux permanent magnet brushless DC motor (AFPMBLDC), AFPMBLDC with arc-shaped magnets and its multi-objective optimization design are researched. Firstly, the main parameters proposed, initial designs carried out according to given requirements. Furthermore, pole arc coefficient, thickness, radius, air-gap length selected as factors. Then,...

The cogging torque reduction methods in permanent magnet (PM) machines are more or less FEA trial and error-based cause undesirable side effects, such as distorted back EMF, new harmonic components, structure asymmetry. A slot-opening grouping method can address these issues. However, it needs to model all slots design validation during practical optimization iterations, also leads back-EMF red...

This paper deals with characteristics of interior permanent magnet synchronous motor considering anisotropic characteristics of electrical steel sheets. Motor characteristics of back electro-motive force (EMF), d-q axis inductances, and core loss are calculated by FEA considering anisotropy of electrical steel sheets and compared to the results from experiment and general FEA; using single mate...

Redundant flux-switching permanent-magnet (R-FSPM) motor is a new fault-tolerant machine having PMs in the stator, offering high efficiency, high reliability, and robust structure. This paper proposes two remedial control strategies for fault-tolerant operations of the R-FSPM motor drive in the single-channel (SC) mode. First, by doubling the healthy-channel currents, the reduced torque due to ...

AIM To examine the effects of low-amplitude, low frequency electromagnetic field therapy (EMF) therapy in patients with persistent chronic lower back pain associated with degenerative disc disease. DESIGN Double-blind, randomized and placebo controlled. INTERVENTION EMF using a medical device resonator; control group underwent same procedures, except the device was turned off. OUTCOME MEA...