Question: A 250-V, 4-pole, wave-wound d.c. series motor has 782 conductors on itsarmature. It has armature and series field resistance of 0.75 ohm. The motor takesa current of 40 A. Estimate its speed and gross torque developed if it has a flux per pole of 25 mWb Answer: Step 1 Mechanical Engineering homework question answer, step 1, image 1 Mechanical Engineering homework question answer, step 1, image 2 Step 2 Mechanical Engineering homework question answer, step 2, image 1 Step 3 Mechanical Engineering homework question answer, step 3, image 1

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Answer:

Step 1 of 3

Calculate the total time taken by the cam for one revolution:

Calculate the angular velocity of the cam:

Here, the angular velocity of cam is

Substitute 6.4 s for t.

Hence, the angular velocity of cam is .

Step 2 of 3

Follow the steps given below to plot the follower displacement diagram:

1. Choose Y-axis as length of follower rise in inches and X-axis as cam angle or time in seconds.

2. Since, from  follower moves with constant velocity, so draw a straight line passing through  and .

3. Since, there is a dwell of 2.3 s, so draw a straight line parallel to X-axis as shown below.

4. Since, there is a fall of 1.2 s, so draw a straight line passing through  and.

Step 3 of 3

Draw the graph for the follower displacement, cam angle and time as shown below: