Relative to the direction of rotation, which...

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Question 1 of 205eccefa3bacbc34ba4d4804d

Relative to the direction of rotation, which statement is true concerning a D.C. motor commutating pole polarity?

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5eccefa3bacbc34ba4d4804d

Relative to the direction of rotation, which statement is true concerning a D.C. motor commutating pole polarity?

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🔍 Key Concepts

• Commutating (inter) poles are used to improve commutation and reduce sparking at the brushes in a D.C. motor • Interpoles are placed between the main field poles and their polarity is related to the direction of rotation and the armature current • The polarity of a commutating pole is chosen so that it aids commutation by opposing the armature reaction under the brushes

💭 Think About

• Picture the direction of rotation and identify which main pole is just ahead of the brush position and which is just behind it • Think about whether the commutating pole needs to have the same or opposite polarity as the adjacent main pole in order to neutralize armature reaction at the brushes • Relate the term "preceding" and "following" to the physical rotation of the armature: which pole does the conductor pass first, and which does it pass next, as it turns?

✅ Before You Answer

• Be clear on what preceding and following mean relative to the actual direction of rotation drawn on a sketch • Confirm whether inter/commutating poles are connected in series with the armature, which makes their polarity depend on armature current direction and thus rotation • Verify which main pole (preceding or following) must have the same polarity as the commutating pole for proper commutation with the given rotation direction

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Question 1 of 205eccefa3bacbc34ba4d4804d

Relative to the direction of rotation, which statement is true concerning a D.C. motor commutating pole polarity?

Back

Question 1 of 20

5eccefa3bacbc34ba4d4804d

Relative to the direction of rotation, which statement is true concerning a D.C. motor commutating pole polarity?

No comments yet

Be the first to share your thoughts!

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

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed