1968
DOI: 10.1049/piee.1968.0224
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Some aspects of electrical machines with open magnetic circuits

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Cited by 20 publications
(4 citation statements)
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“…Whilst it is true that enlargement of the air gap, such as is necessitated in the sandwich type of construction, results in a lowering of power factor and efficiency if all other dimensions remain unchanged, it is important to set down all the quantities which influence the performance and a recent paper (Laithwaite 1965) has shown how this can be done by means of a single equation. Every electrical machine consists basically of at least one electric and one magnetic circuit interlinked.…”
Section: Patent Literaturementioning
confidence: 99%
See 1 more Smart Citation
“…Whilst it is true that enlargement of the air gap, such as is necessitated in the sandwich type of construction, results in a lowering of power factor and efficiency if all other dimensions remain unchanged, it is important to set down all the quantities which influence the performance and a recent paper (Laithwaite 1965) has shown how this can be done by means of a single equation. Every electrical machine consists basically of at least one electric and one magnetic circuit interlinked.…”
Section: Patent Literaturementioning
confidence: 99%
“…Such is the degree of flux spreading outside the primary, however, that the value of Am//m in equation ( 1) is so great that good machines can be constructed without steel in the primary member. The theory of such machines with open magnetic circuit has been given in a recent paper (Laithwaite 1968). Further information on high speed transport applications is also available (Laithwaite and Barwell 1969).…”
Section: G=w"u(t) Aeam (1) E Mmentioning
confidence: 99%
“…Dispersões Finais ................................................................................................. Desde a primeira publicação de peso sobre motores lineares de indução (LAITHWAITE, 1957), seguiu-se intensa investigação sobre as forças normais e de tração nesse tipo de máquina (NASAR, 1969). A característica externa do motor linear de indução depende fortemente do comportamento da onda eletromagnética trafegante em seu entreferro, o que moveu a investigação científica também a concentrar esforços nos chamados efeitos de borda, decorrentes do inevitável circuito magnético aberto da referida configuração (LAITHWAITE, 1968).…”
Section: Comprimento Longitudinal Do Primário (Total E Equivalente) [M]unclassified
“…Cerca de uma década depois, Eric Laithwaite publicou um trabalho versando a respeito de máquinas com circuito magnético aberto, tais como o transformador de núcleo aberto e o motor linear de indução (LAITHWAITE, 1968). Na abordagem desse último, o autor propôs o equacionamento de forças verticais e de tração, com um circuito equivalente contendo resistores que modelassem tais forças, considerando um secundário tipo lâmina sem núcleo magnético.…”
Section: Comprimento Longitudinal Do Primário (Total E Equivalente) [M]unclassified