Control For Induction Motors Essay Example for Free

Control For Induction Motors Essay Project paln Soft starter and soft stopping for speed control for induction motors Introduction The project is entirely on the design and development of a soft starter converter that will satisfy and implement the soft starting and soft stopping for speed control of an induction motor. Soft starters also called solid state starter are used for gentle starting and stopping of induction motors. Pumps, centrifuges, compressors, escalators, belt conveyors, mills, fans, stone crusher and saws are typical applications. If a motor is not adequately protected the sudden change in rotation torque and speed, which occurs on starting and stopping will jolt the equipment linked to it. Over the long term this can lead to increase in mechanical wear of gearboxes, clutches, transmission and conveyor systems. Abrupt starting and stopping can also damage goods being handled by the mechanical equipment. For instance, the filling and distribution of glass bottles and containers loaded on to a conveyor holds a potential for a minor disaster. One sudden jerk during starting and stopping will surely cause the entire process line to engage in a mass of broken glasses and dripping liquids or sticky product. With pumps soft starters eliminate pressure shocks in pipes and valves when the pipe pump starts or stops. This poses a particular safety hazard when the transfer of volatile and/or inflammable liquid is involved. Background Information Soft starter controllers provide the soft starting and stopping of induction motors with no beyond high maximum currents, motor heating or mechanical shocks. However this is more vital for most of large machines because there is entirely reduced starting torque and reduced impacts on mechanical parts, however this result in an increase in the equipment lifespan. Also the soft starting and soft stopping result in mass energy saving the power supply since the starting currents and voltages are low, meaning the amount of power dissipated at the start is less as compared to a normal start without a soft start. An induction motor soft starting and soft stopping inverter is a vital aspect which serves as a premier protection to the machine itself and the entire production line. The outmost need for soft starting and soft stopping is to prescribe the inrush currents that an induction motor absorb when being started from rest. This needs attention because it eventually causes the line voltages to decline, which is nevertheless a danger to such loads sensitive to low voltages. These inrush cerrents and high starting voltages are major cause to mechanical stress; when large currents enters the motor windings a larger magnetic field is being produced which can cause some parts to attract and repel Objectives The main project aim is to design and develop a soft starter converter that implements the soft starting and soft stopping of an induction motor. Specifically, the project will focus on the following objectives 1. To design and develop the hardware components of the project that features the soft starting and soft stopping of an induction motor. 2. To design and develop the software hardware that could be integrated to the hardware 3. To demonstrate the converter responses to starting and stopping operations of an induction motor. Methodology Justification soft starter controllers ensure the soft starting and stopping of induction motors without excessive peak currents, motor heating or mechanical shocks.This has a particular importance in large machines due to the power consumption in the megawatt range. The energy adsorbed by the motor winding and the shock torque have both and important impact in the mechanical parts and consequently, influences the equipment lifetime. they allow the reduction of cable section and the energy peak power from the electricity supplier. An induction motor soft starting and soft stopping inverter is a vital aspect which serves as a premier protection to the motor lifespan and http://www.ctiautomation.net/Control-Techniques-Soft-Starters.htm https://docs.google.com/viewer?a=vq=cache:srtLMpIZcMoJ:www.eaton.com/ecm/idcplg%3FIdcService%3DGET_FILE%26dID%3D428122+soft+starter/stopping+induction+motorhl=engl=mypid=blsrcid=ADGEEShf7UdxSK-mMBvBj-zftdxPnL24HsZr2T32U2sCIlpx8wZ1tKtG_L3r51v4roi7xe-vF81v_Qmww-XYxvRGlNfR5yzJBmrupuoU0b35MJVZOBjH1byAnHUh2i8OyPBR8r9Cd-bJsig=AHIEtbS1MVgMGWzC7MHbsX548ilI1M0rEQ

the real world Essay -- essays research papers

The Real World? "This is the true story of seven strangers picked to live in a loft and have their lives taped. Find out what happens when people stop being polite and start getting real†, so starts every episode of a popular TV show on MTV called The Real World. This show is based on the idea of having no script or actors, and to just see what happens when strangers live together and interact with each other for three months. This show has been on for over a decade now and is still a popular show even though throughout the last ten years the show has changed in many ways. It has changed in the people, places, and activities that make up the Real World. Through the show’s history The Real World has become less of a reality show and more of a circus show. In the early 1990’s was the first time that The Real World aired on MTV. This show was different than any other show that had ever appeared on national television. What made this show so different was the lack of a script or actors. This genre of television was named reality television. When developing the idea of The Real World executives at MTV wanted to make a primetime soap opera but where having difficulties coming up with the funding to hire actors and writers, so their solution was to eliminate these aspects of a show. There idea was then to have seven strangers ages eighteen to twenty five live together and see if the American public could catch on to ...

Analysis of Catherine’s Character in Emily Bronte’s novel – Wuthering Heights

Catherine is a very complex character in Emily Bronte's novel – Wuthering Heights. We first meet her in the beginning paragraphs of the novel at first she appears a innocent child who loves the outdoors however later on when she is introduced to the Linton's this all changes she becomes greedy materialistic and two faced. She makes another change just before and after she married Edgar Linton. She became very fragile but also very violent. Before she died she made a final change to being very envious however throughout all her life she always remained loyal to Heathcliff and always loved Heathcliff Catherine and Heathcliff's relationship wasn't started off very well however once they were able to get to know each other they became great friends â€Å"†¦ Catherine was much to fond of Heathcliff† Even after the Christmas Catherine spent with the Linton's she was still good friends with him. She was such a good friend she risked creeping along a roof to be able to reach him. There friendship was so great it could be called love. Their love still continued into Catherine's and Edgar's marriage on which she said this about Heathcliff, â€Å"if all else perished and he remained I should still continue to be. I believe that the skill of Pathetic Fallacy was used to describe Catherine and Heathcliff's relationship as the house, Wuthering Heights itself. Wuthering Heights is rough, cold solid as was the relationship of Catherine and Heathcliff. â€Å"There younger relationship as friends was solid and wild whilst there relationships as adults and on the moors was rough and cold. This proves that her one tribute throughout her whole life was her love for Heathcliff. The more dark side of her character began to expose itself after the 5weeks she spent at the Linton's in Thrushcross Grange Catherine once a rough and wild girl spending her time playing on the moors now had changed. When she arrived home around Christmas time she had changed completely. Catherine was now wearing glamorous clothes, a silk frock with brilliant white trousers. Catherine manner had changed she was polite and what was known as Ladylike. She now didn't run to where she needed to go as before, she rode on horse back. With all these beautiful luxuries is no wonder why she had started to grow fond of these items, she had started to become materialistic. Her opinions on Heathcliff had changed she even tells him â€Å"you're sp dirty† however this is what she once was. Before her arrival to Thrush cross grange she would of neither cared or commented on the way Heathcliff looked that the state he was in would of not troubled her however as the story moves on I can see that when she is at Thrushcross she is peaceful and ladylike however when at Wuthering Heights she is rough both reflect the characteristics of each house. Subsequent to her stay at Thrushcross Grange Catherine's relationship with the Linton's became stronger. Catherine's relations were most strong with Edgar Linton they visited each others house frequently. There relationship grew and grew till it was announced that Catherine was to wed Linton and Catherine commented on marrying Heathcliff by saying â€Å"†¦ degrade me to marry him† This is a sign that she found her self superior to Heathcliff. Heathcliff hearing this ran away for three years. Catherine and Heathcliff were soul mates they were one soul entwined at Wuthering Heights. The relationship is rough, wild, dark and cold just like them and Wuthering Heights are. It appears to us that if one was taken away the other two would be destroyed since they are all there to support each there take one away the others shall fall. This is shown to us after Heathcliff left Catherine came down with a Brain fever and Wuthering Heights suffered great structural damage in a storm â€Å"†¦ knocked down a portion of the east chimney stack† Another example of this is when Catherine and Nelly leave to go to Thrushcross grange after Heathcliff left leaving Hindley to fall into a bad patch of drinking and gambling. Mr and Mrs Linton at Thrushcross grange contract an illness from Catherine and shortly they both die. Once Mr and Mrs Linton died there were just Edgar Nelly and Isabella looking after Catherine. Bronti uses this sentence to describe the relations between Catherine and the Linton's â€Å"†¦ the Honeysuckles embracing the thorns† The thorn was Catherine – the rough wild and harmful while the Honeysuckle was the Linton's – the kind gentle and harmless. The honeysuckle was moulding around the thorn meaning that the Linton's were doing everything to make Catherine better. But trying to make her better was a lost cause because she could never be truly at full health without the other half of her soul, this was Heathcliff. Catherine would always be damaged into they were reunited. When Heathcliff finally does return Catherine again makes a dramatic change. Following the return of Heathcliff Catherine becomes Envious. We can see that Isabella, Edgar's sister has strong feelings for Heathcliff. Catherine also sees this and try's her hardest to push Isabella away from her soul mate. Not just is Isabella being driven away by Catherine she is also being pushed away by Heathcliff. Heathcliff wants Catherine to be in much pain for marrying Edgar. Isabella eventually realises this but it was to lat she realises after Heathcliff and they have wed. We she this when she writes letter to Nelly which said â€Å"I hate him†¦ † The marriage had bad effects but none of them were attended since a couple of months later Catherine died next to her one and only true soul mate Heathcliff. It is evidential that Catherine never fully recovered from her brain fever. Her soul had been theoretically cut into when Heathcliff left, one half was with him the other with her. When he did finally return Catherine was happy however she noticed after a short period of time that Heathcliff paid more attention to Isabella than he did her. Catherine soul once again was ripped by Heathcliff's terrible deed, his and Isabella's marriage. However much later Heathcliff tried unsuccessfully to mend there relationship, however this could not be done and Catherine died next to Heathcliff in Thrushcross Grange. Catherine as you can see was a very complex character. She experienced all the character traits life could throw at her but one that stood above the rest was her love for Heathcliff. All the way through her life Heathcliff was there in some shape or form. She was connected to him all the time, she climbed buildings just to see him, ran out in the harsh cold weather of the moors to play with him but when he was not there she suffered major illness. Even when they we both married they were willing to risk everything by sharing a long and passionate kiss. Catherine belongs to Heathcliff; Heathcliff Belongs to Catherine just like Wuthering Heights belongs to the moors and the moors belongs to Wuthering Heights. Each of these 4 are cold, harsh wild and strong. When there together supporting one another they are an uncontrollable force.

A Domestic Dilemma Essay - 1339 Words

Carson McCullers takes the reader on a journey into the lives of a family plagued by alcoholism in quot;A Domestic Dilemmaquot;. The realism of the story is astounding, as most people will often find themselves torn when facing difficult family decisions. The Meadows’ family is torn by both compassion and suffering, and Martin Meadows is faced with one of the most difficult decisions of his life. In A Domestic Dilemma, the author conveys the idea that individuals facing difficult decisions in marital relationships must act in the best interest of one’s self.The conflicts in the story surround Martin and Emily’s marital relationship. It is clear that their marriage is deteriorating because of Emily’s alcoholism. Emily often attempts to†¦show more content†¦quot;As Martin watched the tranquil slumber of his wife the ghost of the old anger vanished.quot; He knows that his emotional and physical desire for Emily may be the very element that destroys h is children’s lives. Martin is searching for a solution to his problems that will keep all his loved ones safe. Martin Meadows is an ideal husband. He works hard in his office and his home. Martin is amazingly efficient, tending to the garden, decorating for Christmas, cooking for his children, and pulling their lose teeth. He longs for the days back in Alabama when his family was happy and alcohol was not a part of their lives. From the start of the story Martin is weary from the disappointment he has encountered in the changes seen in his wife. During Domestic Dilemma Martin begins to realize that his efforts are no use, and his wife’s behavior is not going to change before something horrible happens to one of his children. Her drunken outbursts and manipulative games confuse the children at their young ages, and Martin fears that his children will not forget these horrible incidents and will grow up emotionally strained by their mother’s problem. Emily’s move to New York tore her life apart. 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