Voltage Unbalance (VU) is one of the most common power quality problems in industrial electrical systems and it a subject systematic study. This problem affects operation efficiency Induction Motors (IMs), which are loads that demand more energy sector with around 68%. The Factor (VUF), defined by international IEC standard, main factor used to characterize this problem. article aims present th...

The traditional method to calculate bending displacement of helical tooth is generally based on simplified tooth profile. Besides, the unbalance loading is not taken into account. To overcome this disadvantage, a new method to calculate bending deformation of helical tooth is introduced. First, gear section is divided into several copies along tooth width and each section’s moment of inertia is...

The phenomenon of imbalance is a variation voltage and current waveforms from perfect sinusoidal waveform, which considered crucial challenge in power systems. Uneven loads disturbances result three-phase voltage/current unbalance that leads to temperature rise low output curves at synchronous machines. Thus, the unbalance/fault must be recognized avoided. This article suggests methodology dete...

Induction motor is the most popular load in the industry, it is very important to study about the effects of voltage quality on induction motor performance. One of the most important voltage quality problems in power system is voltage unbalance. This paper evaluates and compares two methods including finite element method (FEM) and equivalent electrical circuit simulation for investigation ...

Based on Bower’s affective network theory, the article links the dynamic analysis of affective factors in affective instruction, and presents affective instruction strategic of dynamic synchronization between teacher and students to implement the best ideal mood that promotes students’ cognition and affection together. In the process of teaching, the main mood of teacher and students varies spi...

This paper presents a measurement system intended to monitor the usage of walker assistive devices. The goal is to guide the user in the correct use of the device in order to prevent risky situations and maximize comfort. Two risk indicators are defined: one related to force unbalance and the other related to motor incoordination. Force unbalance is measured by load cells attached to the walker...

In a service-oriented multi-tenant SaaS application, all tenants share services and user requests of the service change dynamically. In order to provide high-quality web services, we must solve the problem of the load unbalance caused by dynamic user requests’ change. This paper proposes an approach based on hypergraph partition to keep load balance for serviceoriented multi-tenant SaaS applica...

This paper aims to present a simulation model for the analysis of operational characteristics electric motors (EMs). The was developed on Simulink platform MATLAB program and allows in supply conditions with harmonics voltage unbalance. contribution is that it considers mechanical losses provides study effect each component electrical sequence unbalance electromechanical EM. tested 37.3 kW EM, ...