Abstract: Based on the theory of electromagnetic induction, a new method for obtaining alternating triangular voltage waveform across a secondary winding in a newly designed transformer change in position of core based on mutual induction is proposed when a d.c supply applied across a primary side of a transformer. This paper discusses the calculation of the flux position and the realization of the alternating triangular voltage waveform. The reasonability and validity are verified by the mathematical modulation for a ferromagnetic material is used .This method offers a new thinking for designing and modeling of transformer which is able to provide a secondary voltage.

• Publication Date: 09-Jul-2012
• DOI: 10.15224/978-981-07-2950-9-9530
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Abstract: This paper illustrates the importance of controllers on energy saving opportunity of a partially loaded three-phase induction motor drive in variable load and speed applications. An overview of various controllers: loss model controller, search controller and their hybridization are given. Fuzzy Pre-Compensated Proportional Integral (FPPI) is used to improve motor's dynamic performances during the activation of optimal energy controllers. The economics of a 100 HP induction motor is investigated with two topologies namely constant Volt/frequency (V/f) controller and Particle Swarm Optimization (PSO) controller in steady-state conditions. In this study, the flux level in a machine has been considered to be adjusted to give minimum operating cost for a given load/speed.

• Publication Date: 09-Jul-2012
• DOI: 10.15224/978-981-07-2950-9-9533
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