In this article, a novel winding switching control strategy is proposed to extend the speed range of consequent-pole ferrite-permanent magnet hybrid-excited machine (CPFPM-HEM) for electric vehicle application. The key that in low-speed range, ac armature and dc field are connected series achieve large starting torque, while high-speed injected with adjustable currents realize variable constant...

There has always been doubt on the accuracy of 2D analysis of small electric machines. To investigate the validity of this doubt, in this present work a small uni-coil shaded-pole induction motor is analyzed in 2D and 3D and the results are compared. In order to maintain the paper size as compact, the analysis is limited to the air-gap flux density distribution, variation of the main winding in...

Motors are critical components for electric utilities and process industries. A motor failure can result in the shutdown of a generating unit or production line, or require that redundant plant be utilized to circumvent the problem. One major cause of failures is breakdown of the tum insulation leading to puncture of the groundwall. Early detection of intertum shorts during motor operation woul...

This paper proposes a resonant electric cradle design with infant cries recognition, employing an Arduino UNO as the core processor. For most commercially available electric cradles, the drive motor is closely combined with the bearing on the top, resulting in a lot of energy consumption. In this proposal, a ball bearing design was adopted and the driving force is under the cradle to increase t...

We present new anti-de Sitter black hole solutions of gauged N = 8, SO(8) supergravity, which is the massless sector of the AdS4×S vacuum of M-theory. By focusing on the U(1) Cartan subgroup, we find non-extremal 1, 2, 3 and 4 charge solutions. In the extremal limit, they may preserve up to 1/2, 1/4, 1/8 and 1/8 of the supersymmetry, respectively. In the limit of vanishing SO(8) coupling consta...

Cable winding is an alternative technology to create stator windings in large electrical machines. Today such cable winding is performed manually, which is very repetitive, time-consuming and therefore also expensive. This paper presents the design, function and control system of a developed cable feeder tool for robotized stator cable winding. The presented tool was able to catch a cable insid...

Partial Discharge (PD) is the most important source of insulation degradation in power transformers. In order to prevent catastrophic failures in transformers, PDs need to be located as soon as possible so that maintenance measures can be taken in time. Due to the structural complexity of windings, locating the PD source inside a transformer winding is not a simple task. In this paper, the effi...

This study provides an insight in the analytical estimation of electric field along surface a stress grading system (SGS) end-winding region electrical machine. An approach is derived for materials (FGMs) having power-law electric-field-dependent conductivity. Despite some limitations, introduced model can be used preliminary analysis SGS with specific geometric and dielectric parameters, both ...

This paper describes a 3D finite element (FE) based method to calculate the proximity losses for magnetic components in power conversion system. The loss is main concern of copper which causes ac winding. FE model built on definitions geometries, meshes, materials, electric circuits, boundary conditions, load as well characteristics wire. total sum each calculated with density function using ob...

The paper considers the methodology of calculating number self-starting pump units depending on network voltage landing and basic calculation dependencies process selfstarting electric motors supplied from three-phase three-winding transformer; substitution scheme for one phase circuit is made. Technical solutions upgrading units, which allow applying selfstart mode at ameliorative pumping stat...