Pulse-width modulation

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  • The Pros And Cons Of DPWM Schemes

    industrial drives) three-level inverters are used extensively [1]-[2], and recently, their application in low-voltage, high-power traction applications have been introduced [3]-[5]. In these applications, the three-level inverters often need to operate with modulation indices (m) lower than 0.5 [6]- [10]. Additionally, at lower modulation indices, traction drives operating with induction motors (IMs), interior permanent magnet motors (IPMs) or synchronous reluctance motors (SynRMs) may need to provide higher reactive power, thus operating with a lower power factor (pf) [9], [11]- [17]. For example, in [9], the power factor of IPMSMs at 0.2 modulation index is shown to be 0.52. The power factor of SynRMs also varies between 0.3-0.7 based on designed saliency [17]. Hence, the three-level inverters for these applications need to be controlled appropriately at lower modulation indices and lower power factors for optimum…

    Words: 1521 - Pages: 7
  • Furp Case Study Sample

    Description of a Typical Day in the Nursing Home FRP is woken up at about 8:45am to eat breakfast in bed and take his morning medicines. He then goes back to sleep until about 10:30am when the CNA does his morning care and gets him out of bed. Once he is up and in his wheelchair, he visits the shower room for his morning bowel movement. He then wheels himself around the halls and heads to the main dining room for lunch. After lunch, he heads to his room and goes back to bed. He has dinner…

    Words: 1749 - Pages: 7
  • Heart Rate Exercise Essay

    more movements that a person does, the higher their heart rate will be. After doing this experiment, we found that the more movements and exercises your body does, the more increased your heart rate will become. There could be possible sources of error like any experiments, so this data is the most accurate data we could possibly achieve. Introduction: How do body positions and/or exercise affect heart rate? Our experiment is based around this essential question. From what is known, exercise…

    Words: 1111 - Pages: 5
  • Forgiveness Model

    Summary Magnuson and Enright article “The Church as a Forgiving Community: An Initial Model characterizes how forgiveness portrays a major impact in the lives of families, community, and churches all over the universe. The role of forgiveness can be demonstrated by showing compassion to anyone who has acted unfairly. The Bible tells us in Ephesians 4: 32 that we ought to forgive each other, even as God for Christ’s sake hath forgiven us. In this article, Magnuson and Enright (2008)…

    Words: 788 - Pages: 4
  • Wit Margaret Edson Analysis

    students as her doctor is kind of an embarrassing moment for her, she felt that she could have given him an A+, but at that point nothing could be done. Instead of him learning from her, it was the opposite, she was learning from him as he run tests and other stuff on her. Are Vivian’s wishes honored at the end of the play is an interested question, because there was drama at this point. Professor Bearing told her primary nurse that if her heart stopped beating just let it (559). Susie told Dr.…

    Words: 1008 - Pages: 5
  • Advantages And Disadvantages Of Code-Division Multiple Access (CDMA)

    In order to get a good design, the bandwidth of modulation need to be minimized for transmission. A transmission bandwidth that has a greater magnitude than the bandwidth required for the minimum signal is used by the spread spectrum. The advantage of spread spectrum is that it can be many users use the same bandwidth at the same time without interfering with each other. However, this is not good for a few number of users because it is not economic. Spread spectrum is a form of wireless…

    Words: 1451 - Pages: 6
  • Charles Ives Construction Of Subjectivity In Schubert's Music

    same theme but it appears in 5th above which starts in ‘G’ (1 Figure). This theme appears again and again as the modulated form through the whole movement. It sounds pretty simple but it plays very important role in this movement because it sets center tonality of this movement. Also, this movement starts with this theme and also ends with this theme so it contributes to establishing coherence of the movement (2 Figure). This can explain the ‘organic’ sense which Solie, the author of article…

    Words: 2248 - Pages: 9
  • Essay On Advantages And Disadvantages Of OFDM

    2 OFDM SYSTEM:- OFDM system is divided into three parts 1. multi carrier modulation 2. frequency division multiplexing 3. Orthogonal frequency division multiplexing. 1.Frequency division multiplexing:- Frequency Division Multiplexing is a form of signal multiplexing which involves assigning non – overlapping frequency ranges or channels to different signals or to each user of a medium. A gap is left between each of these channels to ensure that the signal of one channel does not overlap with…

    Words: 1529 - Pages: 7
  • The Empirical Formulation Of Radio Wave Propomentation Models

    RADIOWAVE OUTDOOR PROPAGATION MODELS General definition: • They are empirical mathematical formulation for the characterization of radio wave propagation as a function of frequency, distance and other conditions. • These models predict the path loss (i.e. the reduction in power density of an electromagnetic wave as it propagates through space or underground) of a transmitter and also the effective coverage area of transmitter. We know that when a signal travels from a wireless channel, it…

    Words: 1189 - Pages: 5
  • Animal Physiology Lab Report

    Introduction: The heart rate of an animal can be used as an indicator to identify when a stimulus evokes a reaction from the animal. Specifically in the case of humans’, there tends to be the cognitive ability to physically withhold a reaction from a stimulus and mask the involuntary reaction. However, the heart rate reacts immediately after a stimulus, and is not reigned in or controlled cognitively, so could the heart potentially be a true indicator of an individuals reaction to a stimulus?…

    Words: 794 - Pages: 4
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