A commutator with a diameter of 50 cm rotating at 1000 rpm.

For a brush width of 1.5 cm, find the time of commutation in ms.

A. 0.443.

B. 0.573.

C. 0.512.

D. 0.649.

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Answer: B

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Mike
2
The time of commutation can be calculated using the formula:

Time of commutation = (Brush width * 60) / (π * Commutator diameter * RPM)

Given:

Brush width = 1.5 cm

Commutator diameter = 50 cm

RPM = 1000

Substituting these values into the formula:

Time of commutation = (1.5 * 60) / (π * 50 * 1000)

Time of commutation = 90 / (π * 50000)

Time of commutation ≈ 0.573 milliseconds

Therefore, the time of commutation is approximately 0.573 milliseconds. The correct answer is B.