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Question 1 of 2066636eed28f7522a1c51d872

What are the operating characteristics of the Ward-Leonard DC motor speed control system as shown in figure "A" of the illustration? Illustration EL-0101

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66636eed28f7522a1c51d872

What are the operating characteristics of the Ward-Leonard DC motor speed control system as shown in figure "A" of the illustration? Illustration EL-0101

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🔍 Key Concepts

• How a Ward-Leonard DC speed control system changes motor speed • Relationship between armature voltage/current and field strength in a DC motor • What part of the circuit in figure "A" is actually being adjusted by the speed control device

💭 Think About

• Look at where the adjustable speed-control element is drawn in figure "A". Is it in the armature circuit of the DC motor, or in a field circuit? • For a Ward-Leonard system, think about whether the motor’s torque must stay flexible as load changes. Would that require the armature current to stay constant or be allowed to vary? • Ask yourself: if the armature voltage is being changed to control speed, what usually happens to armature current as load on the shaft increases or decreases?

✅ Before You Answer

• Identify clearly which field winding (generator or motor) is being controlled by the rheostat labeled speed control • Decide whether the motor armature current can change with load, based on the way the generator feeds it • Confirm whether the motor field in this arrangement is intended to be kept essentially constant or deliberately varied for speed control

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Question 1 of 2066636eed28f7522a1c51d872

What are the operating characteristics of the Ward-Leonard DC motor speed control system as shown in figure "A" of the illustration? Illustration EL-0101

Back

Question 1 of 20

66636eed28f7522a1c51d872

What are the operating characteristics of the Ward-Leonard DC motor speed control system as shown in figure "A" of the illustration? Illustration EL-0101

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

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