Doubly salient wound field machines exhibit the advantages of robust structure and controllable flux, hence have been utilized as generators in applications automobiles renewable energy. However, inherent unbalanced phase back-electromotive force (EMF) waveform caused by asymmetric flux path brings difficulties for precise control smooth operation. To solve problem back-EMF conventional doubly ...

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...

In this paper, an adaptive sliding mode observer (ASMO) associated with a phase locked loop (PLL) is assessed for the sensor-less control of rotor-tied doubly-fed induction generator (RDFIG). proposed PLL-ASMO estimator, ASMO utilizes stator current, voltage, and back electromotive force (EMF) as state variables. The used in order to estimate back-EMF from which slip position/speed extracted us...

Hardware complexity of a motor drive can be reduced by estimating controls rather than measuring using sensors. In this way the corresponding sensors are eliminated and the system becomes more robust. This article is about speed control of a sensor less induction motor with predictive current controller technique. This particular speed control technique does not require direct measurements of m...

The vast majority of controllers found in manufacturing plants use a combination of Proportional, Integral and Derivative (PID) control. These controllers are easily understood, and there are only three controller values to set up when attempting to achieve an acceptable system response. This paper looks at one industrial application of a PI controller, controlling the speed of a casting drum i...

In this study, the back electromotive force (EMF) waveforms of a flux switching permanent magnet (FSPM) machine and variable memory (VFMPM) with same main dimension were researched. Firstly, simulation result showed that maximum amplitude phase EMF waveform FSPM was 245% larger than VFMPM machine, verified by experimental (243%). Secondly, harmonics compared, including enhance condition weaken ...

In this study, a direct drive in-wheel system is proposed as high power density for reducing the intermediate parts, such speed reducer by increasing torque. We propose design strategy to show that multipolarization and improvement of gap magnetic flux can effectively increase density. A Halbach array magnet rotor combines main electrode magnets spoke with core adopted technique improving compa...

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...

Within the appliance motor control industry there is an increasing trend to move towards using brushless dc motors. This trend is in response to recent legislation mandating improved efficiency standards in appliance applications. Brushless dc motors do however require rotor position information in order to select the appropriate commutation angle. In cost sensitive applications such as applian...