2010
DOI: 10.1590/s0100-69162010000600003
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Dimensionamento de motores para o bombeamento de água

Abstract: RESUMO: O dimensionamento de motores com potência acima da necessária acarreta maior custo inicial, menor rendimento e menor fator de potência. Desde 1996, que se fabricam no Brasil motores elétricos com fator de serviço maior do que a unidade, obedecendo a valores prescritos em norma. O fator de serviço informa a potência disponível do motor em regime contínuo para as condições de carga nominal. A literatura técnica de dimensionamento de motores para acionamento de bombas hidráulicas indica a necessidade da a… Show more

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Cited by 7 publications
(3 citation statements)
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“…Both the service factor as the increase in power are safety factors for the sizing, and they have the function of supplying higher power demand due to changes in working conditions, such as curves characteristic of the pump or motor, and power quality, such as oscillation and imbalance of signal voltage. OLIVEIRA FILHO et al (2010), when evaluating 12 motors with power from 0.5 to 125 hp, concluded it should not be used an increase in power in the motor sizing with service factor greater than the unity, leading to overestimation from 44% to 88%. RAMOS (2009) analyzed 86 cases of motor replacement of standard type for high efficiency motors in an industrial group in the food sector, and the motors had power from 7.5 to 125 hp, for a total of 3,870 hp.…”
Section: Introductionmentioning
confidence: 99%
“…Both the service factor as the increase in power are safety factors for the sizing, and they have the function of supplying higher power demand due to changes in working conditions, such as curves characteristic of the pump or motor, and power quality, such as oscillation and imbalance of signal voltage. OLIVEIRA FILHO et al (2010), when evaluating 12 motors with power from 0.5 to 125 hp, concluded it should not be used an increase in power in the motor sizing with service factor greater than the unity, leading to overestimation from 44% to 88%. RAMOS (2009) analyzed 86 cases of motor replacement of standard type for high efficiency motors in an industrial group in the food sector, and the motors had power from 7.5 to 125 hp, for a total of 3,870 hp.…”
Section: Introductionmentioning
confidence: 99%
“…Motors with rated load index with power factors below 75% require a greater amount of electrical energy to produce mechanical energy. (OLIVEIRA FILHO et al, 2010).…”
Section: Introductionmentioning
confidence: 99%
“…Normalmente, a curva característica de rendimento de um motor de indução apresenta valores maiores quando sua carga se encontra na faixa de 75 a 100% de sua capacidade nominal enquanto seu fator de potência atinge o valor máximo de 100 a 125% do índice de carregamento nominal. Portanto, motores com índice de carregamento nominal abaixo de 75% operam com rendimentos e fatores de potência menores visto que requerem, proporcionalmente, maior quantidade de energia elétrica para produzir energia mecânica (Oliveira Filho et al, 2010).…”
Section: Introductionunclassified