What can cause excessive sparking of D.C....

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Question 1 of 205eccefa3bacbc34ba4d48066

What can cause excessive sparking of D.C. motor brushes? Improperly seated brushes Improperly set brush rigging

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5eccefa3bacbc34ba4d48066

What can cause excessive sparking of D.C. motor brushes? Improperly seated brushes Improperly set brush rigging

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🔍 Key Concepts

• Brush-to-commutator contact in a D.C. motor • Effect of brush position (brush rigging) on commutation and arcing • Mechanical vs. electrical causes of sparking at the brushes

💭 Think About

• Think about what happens if the brush face does not match the curvature of the commutator—how does that affect current density and sparking? • Consider how moving the brush rigging slightly ahead or behind the neutral plane affects the current reversal in the armature coils. • Ask yourself: can each listed condition, by itself, reasonably disturb commutation enough to create visible sparking?

✅ Before You Answer

• Verify whether poor contact area between brush and commutator would increase or decrease local heating and arcing. • Check if incorrect brush angle or position relative to the neutral plane is known to cause commutation problems and sparking. • Confirm whether each of the two listed issues is independently capable of causing sparking, or if one is harmless by itself.

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Question 1 of 205eccefa3bacbc34ba4d48066

What can cause excessive sparking of D.C. motor brushes? Improperly seated brushes Improperly set brush rigging

Back

Question 1 of 20

5eccefa3bacbc34ba4d48066

What can cause excessive sparking of D.C. motor brushes? Improperly seated brushes Improperly set brush rigging

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

• Brush-to-commutator contact in a D.C. motor • Effect of brush position (brush rigging) on commutation and arcing • Mechanical vs. electrical causes of sparking at the brushes

💭 Think About

✅ Before You Answer

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