The figure below represents principles of the variable pole winding of a three-phase induction motor. Considering this information and the content ...
The figure below represents principles of the variable pole winding of a three-phase induction motor. Considering this information and the content studied on two-speed motors, analyze the following assertions and the proposed relationship between them.
I. If the motor presented is powered by a network that operates at 50 Hz, its two possible speeds are: 1500 and 3000 rpm.
Porque:
II. The speed in the induction motor depends on the number of poles, the electrical frequency, and the slip, and can have two speed values (according to the configuration in the figure).
1. Assertion I is a true proposition, and II is a false proposition.
2. The assertions I and II are true propositions, and II is a correct justification of I.
Correta: The assertion I is a false proposition, and II is a true proposition.
4. The assertions I and II are false propositions.
5. The assertions I and II are true propositions, but II is not a correct justification of I.
I. If the motor presented is powered by a network that operates at 50 Hz, its two possible speeds are: 1500 and 3000 rpm.
Porque:
II. The speed in the induction motor depends on the number of poles, the electrical frequency, and the slip, and can have two speed values (according to the configuration in the figure).
1. Assertion I is a true proposition, and II is a false proposition.
2. The assertions I and II are true propositions, and II is a correct justification of I.
Correta: The assertion I is a false proposition, and II is a true proposition.
4. The assertions I and II are false propositions.
5. The assertions I and II are true propositions, but II is not a correct justification of I.
💡 1 Resposta
Ed 
A alternativa correta é a número 1: "A afirmação I é uma proposição verdadeira, e II é uma proposição falsa". A afirmação I é falsa, pois a velocidade do motor de indução trifásico com enrolamento de polos variáveis depende do número de polos e da frequência elétrica da rede, mas não do escorregamento. Portanto, a velocidade do motor não pode ser de 1500 e 3000 rpm se a rede operar a 50 Hz. A afirmação II é falsa, pois a velocidade do motor de indução trifásico com enrolamento de polos variáveis depende apenas do número de polos e da frequência elétrica da rede, e não do escorregamento.
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