Topic
Sine wave
About: Sine wave is a research topic. Over the lifetime, 12183 publications have been published within this topic receiving 93013 citations. The topic is also known as: sinusoid.
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TL;DR: In this paper, the behavior of rotor eccentricities in current-regulated interior-permanent magnet machines is investigated and the effect of stator-winding parallel paths is examined for both cases.
Abstract: The behavior of rotor eccentricities in current-regulated interior-permanent-magnet machines is investigated The study focuses on two typical topologies of significant industrial relevance: machines with distributed windings with two slots per pole and phase and motors with concentrated coils and three slots per pole pair The effect of stator-winding parallel paths is examined for both cases Coil and terminal electrical quantities and radial forces were simulated using finite-element analysis Unbalanced operation, where the currents are not equal in parallel phase connections due to eccentricity, is also investigated Experimental measurements of electrical quantities and forces on motors with static eccentricity are carried out using two special test setups The experimental measurements validated the simulation results
22 citations
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24 May 2009TL;DR: A signal generator with precise digital frequency control that is 62% smaller the previous designs is presented and can produce analog sine waves and digital cosine waves from 4.8 Hz to 39 kHz with a SFDR greater than 99 dB.
Abstract: Compact signal generators are a necessary component for many biomedical and chemical sensor microsystems. This paper presents a signal generator with precise digital frequency control that is 62% smaller the previous designs. The signal generator can produce analog sine waves and digital cosine waves from 4.8 Hz to 39 kHz with a SFDR greater than 99 dB. In a 0.5 µm CMOS process the total signal generator area is 361µm × 1048µm.
22 citations
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17 May 2013
TL;DR: The design and implementation of a complete prototype of a low powered (25-30 watts), portable and cost effective micro-inverter specially designed for rural areas of developing countries where a single solar module will be able to run AC loads along with DC loads is presented.
Abstract: This paper presents the design and implementation of a complete prototype of a low powered (25-30 watts), portable and cost effective micro-inverter specially designed for rural areas of developing countries where a single solar module will be able to run AC loads along with DC loads. The system consists of a switch mode power supply, DC-DC push-pull converter, DCAC H-bridge inverter, LC filter and finally the test load. The power supply supplies the DC voltage needed to activate the DCDC push pull converter and the optocouplers. The push-pull converter and optocouplers are directly connected to the switches of the full bridge circuitry. The optocouplers work as an isolation for the full bridge circuit and the DC-DC push pull converter boosts the input DC voltage into the desired rated input voltage of the inverter. High frequency Pulse Width Modulated (PWM) pulses are generated by a microcontroller (PIC18F4431) and provided to the switches of full bridge connection. The full bridge inverter outputs a 220V PWM sine wave which is later conditioned to pure sine wave by an L-C filter. Finally, the output is connected to the test load (Table fan) and the test load works in desired speed.
22 citations
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15 Apr 2002
TL;DR: In this article, the mathematical models and results on processing the experimental single-frequency microwave holograms received by scanning subsurface radar with sine wave signal are submitted, and the holograms reconstruction method with the use of support functions, which take into account the near field of the aperture antenna with round cylindrical waveguide, is analyzed.
Abstract: In this paper the mathematical models and results on processing the experimental single-frequency microwave holograms received by scanning subsurface radar with sine wave signal are submitted. The holograms reconstruction method with the use of support functions, which take into account the near field of the aperture antenna with round cylindrical waveguide, is analysed. The models consider both known and unknown phase shift of the signal reflected from the point object. It is theoretically and experimentally shown that single- frequency holograms reconstruction allows to estimate depth of shallowly buried objects and improve the resolution on the probing surface with the growth of objects depths.
22 citations