Shaft Voltage Elimination Method to Reduce Bearing Faults in Dual Three-Phase Motor

Shaft Grounding— A Solution to Motor Bearing Currents

Variable Frequency Drives induce shaft voltages onto the shaft of the driven motor because of the extremely high speed switching of the insulated gate bipolar transistors which produce the pulse width modulation used to control AC motors in heating, ventilation, air conditioning and refrigeration systems. This voltage induced on the shaft becomes great enough to overcome the dielectric of the o...

Space Vector Modulation Based on Classification Method in Three-Phase Multi-Level Voltage Source Inverters

Pulse Width Modulation (PWM) techniques are commonly used to control the output voltage and current of DC to AC converters. Space Vector Modulation (SVM), of all PWM methods, has attracted attention because of its simplicity and desired properties in digital control of Three-Phase inverters. The main drawback of this PWM technique is &#10its complex and time-consuming computations in real-time ...

Space Vector Modulation Based on Classification Method in Three-Phase Multi-Level Voltage Source Inverters

Pulse Width Modulation (PWM) techniques are commonly used to control the output voltage and current of DC to AC converters. Space Vector Modulation (SVM), of all PWM methods, has attracted attention because of its simplicity and desired properties in digital control of Three-Phase inverters. The main drawback of this PWM technique is its complex and time-consuming computations in real-time im...

A Comprehensive Method for Detection of Induction Motors Bearing Faults

In this paper, some deficiencies of previously conducted studies are pointed out. These are including unreliability, dependent to motor and bearing specifications, lack of precision, drawbacks of experimental tests and etc. Here some important works will be reviewed. The proposed method which is based on wavelet decomposition and tracing the trend of statistical features variations, has over...

Using of Dynamic Voltage Restorer (DVR) to Mitigate Sag & Swell Voltage during Single Line to Ground & Three- Phase Faults