What is an important factor in minimizing...

Question 1 / 270705eccefa3bacbc34ba4d4809a

Question 1 of 270705eccefa3bacbc34ba4d4809a

What is an important factor in minimizing D.C. motor commutator wear?

Question 1 of 27070

What is an important factor in minimizing D.C. motor commutator wear?

🔍 Key Concepts

• Brushes and commutator interaction in a D.C. motor • Role of surface films (like copper oxide) on commutator bars • Effect of brush pressure and current density on mechanical and electrical wear

💭 Think About

• Which option would help create a smooth, low-friction, stable contact between the brushes and the commutator over time? • Think about what actually causes wear: is it mostly dryness, mechanical force, arcing, or poor electrical contact? • Among the choices, which condition is generally designed for in D.C. machines rather than avoided?

✅ Before You Answer

• Recall that many D.C. machines are designed to operate with a specific, controlled surface condition on the commutator, not a perfectly bare copper surface. • Check which options describe extreme conditions (too low, too high, very low, excessive) that might actually increase wear instead of reducing it. • Verify which factor is commonly monitored and maintained during routine motor maintenance to keep commutator wear low.

Question 1 of 27070

What is an important factor in minimizing D.C. motor commutator wear?

keeping the ambient humidity as low as possible

ensuring a very low brush current density

establishing the copper oxide surface film

insuring that brush pressure is excessive

Question 1 / 270705eccefa3bacbc34ba4d4809a

Question 1 of 270705eccefa3bacbc34ba4d4809a

What is an important factor in minimizing D.C. motor commutator wear?

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Question 1 of 27070

What is an important factor in minimizing D.C. motor commutator wear?