Under the conditions of increased consumption of energy resources, the problem of their conservation and rational use is topical. About 50-70 % of all energy produced in the world is consumed by the ...electric drive. However, its operation is often accompanied by the appearance of various kinds of defects and damage caused by poor-quality manufacturing or repair, failure of individual elements of electric motors without loss of performance. It results in more energy consumption and premature repair of electrical equipment, and hence in an increase in material costs and enlarged use of energy resources. To eliminate the negative consequences of the operation of an electric drive with defects and damage to induction motors, the monograph presents methods and systems of fault-tolerant control that allow the adjustment of the operating modes using the means of a variable-frequency electric drive. The main idea of such systems is to maintain the operability of technological mechanisms in the event of various malfunctions. The worked out methods and systems make it possible to detect various types of damage at the initial stages of their development. Then, based on the obtained information, they allow upgrading the control algorithm to maintain the operable state of the electromechanical equipment to the possibility of replacing the corresponding equipment or repairing the electric drive motor. That is, the most rational area for using the developed fault-tolerant control systems is industrial equipment, which must continue to operate, despite the deterioration in dynamic characteristics and energy efficiency.
'Electric Motor Control' introduces practical drive techniques of electric motors to enable stable and efficient control of many application systems, also covering basic principles of ...high-performance motor control techniques, driving methods, control theories and power converters.
With the increased emphasis on climate change and reducing harmful emissions in the atmosphere, interest in power electronics converters and electric motor drives has led to significant new ...developments in renewable energy systems or electric propulsion. By and large, an electric machine and a power converter are required as a means of propulsion in transportation-related applications, and an electric generator and a power converter are indispensable parts of many wind-energy-based generation systems. This book resulted in five chapters covering some of the following topics: Linear and nonlinear control of three-phase and multiphase motor drive systems; Linear and nonlinear control of power electronics converters; Winding types of multiphase machines; and Fault-tolerant control of multiphase machines. The chapters published in this book, written by the world's leading researchers in the field, will provide a further impetus to the developments in the field, stimulating new research endeavours in an area that will likely increase in importance in the forthcoming years.
Currently, the feasibility to replace standard efficiency electric motors with higher efficiency ones is assessed with considerations differing from real operating conditions in the industry. This ...study compares the feasibility of replacing 26 standard efficiency motors (IE1) with high-efficiency efficiency ones (IE2 and IE3) in a sugar plant, based on three different energy scenarios and considering the incremental costs or depreciated costs of motors. Energy scenario 1 consider that motors operate for 6000 h/year at full load and nominal efficiency. While scenarios 2 and 3 consider the measured operating time and the load factor of motors. The results show that scenario 1 overestimates electricity consumption between 2 and 18 times, contrasted with a difference of 1–7% in scenarios 2 and 3, leading to saving potentials in scenario 1 between 1.2 and 33.4 times higher than for scenarios 2 and 3. Considering the incremental costs in scenario 1, it is feasibly to replace all the motors in the plant, while it is only feasibly to replace three motors in scenarios 2 and 3 with the depreciated costs. Therefore, the use of scenario 1 based on unrealistic conditions and leading to economic loss, should be avoided in future studies.
•The electricity demand of motors is hardly measured and monitored in industry.•The effectiveness of replacing motors is rarely checked by industry.•Assess motor replacing based on nominal conditions leads to wrong conclusions.•The depreciated cost of motors must be considered to assess their replacement.
Volt-per-hertz (Formula Omitted) control is one the simplest control structures developed for operating electric motor drives, including permanent magnet synchronous motor (PMSM) drives. This paper ...presents the development and testing of a Formula Omitted control for PMSM drives that utilize a Formula Omitted wavelet modulated (WM) dc-ac power electronic converter (PEC). The wavelet modulation technique is characterized by the maximum scale (Formula Omitted) and scale-time interval factor (Formula Omitted). The output voltage of a Formula Omitted WM dc-ac PEC has its magnitude directly dependent on Formula Omitted, while its frequency and phase are dependent to Formula Omitted. These two parameters of the wavelet modulation technique can be used to implement a Formula Omitted control for PMSM drives. The proposed Formula Omitted control is featured with a stabilizing loop to correct the Formula Omitted ratio, and improve the stability of the controlled PMSM drive. The Formula Omitted control for a PMSM drive fed by a wavelet modulated dc-ac PEC, is implemented for performance testing using a laboratory 10Formula Omitted PMSM drive under different operating conditions. Performance results demonstrate stable, dynamic, and accurate responses, with minor sensitivities to the load torque and/or speed changes. Furthermore, test results demonstrate the ability to enhance the efficiency using the tested control for PMSM drives.
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