Thesis deals with the problem of excessive consumption of electricity due to obsolete and energetically inefficient electric motors and presents the fundamental solutions and guidelines to address these shortcomings.
The introduction part addresses the environmental impacts of outdated electric motors, due to which the European Commission adopted regulations and directives in order to reduce the consumption of electric energy. The causes and negative impacts associated with excessive release of carbon dioxide into the atmosphere are presented.
In the second chapter the regulations and directives, which had substantial influence on the development of modern high-efficient electric motors, are chronologically listed and presented. We presented the requirements that must be met by manufacturers of electric motors in order to meet the regulations adopted by European Commission and indicated guidelines for the development of electric motors with ultra-high efficiency.
In the third chapter we discussed the causes for the inefficiency of older electric machines and provided the fundamental solutions to eliminate losses in electric motors associated with the manufacturing materials and technology. The guidelines for increasing the effectiveness of existing types of electric motors are indicated. We also presented a way of improving the efficiency of the drive system using variable-frequency drive.
The forth chapter deals with three phase induction motors with copper squirrel cage. We indicated the types and manufacturing procedures and provided the essential advantages of the copper squirrel cage compared with the conventional design with an aluminum cage.
In the last chapter we presented the types and operating modes of advanced high-efficient synchronous electric motors. We described the properties and benefits of these modern electric motors compared to existing conventional ones.
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