Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 32, Problem 2SQ
To determine
Explain the method to obtain two speeds from a one-winding motor.
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What are the three basic types of three-phase motors?
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DC motor is
O It = If + la
O It=la - If
O If = la
A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the resistance of the series winding is 0.8 ohm. At what speed will it run if a 2-ohm resistance is connected in series with supply voltage? Assume the motor is taking the same current.
Chapter 32 Solutions
Electric Motor Control
Ch. 32 - Prob. 1SQCh. 32 - Prob. 2SQCh. 32 - What will happen if terminals T5 and T6 in Figure...Ch. 32 - Is the motor operating at high speed or low speed...Ch. 32 - Describe the operation of the line diagram in...Ch. 32 - Describe the operation of Figure 325 (B) by adding...Ch. 32 - In Figure 327, the motor cannot be started in high...Ch. 32 - Prob. 8SQ
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- hotors a) What power is developed by a motor that turns at 1200 rpm and has a torque of 3.0 N-m?arrow_forwardA 220 V shunt motor has an armature resistance of 0.5 ohm and takes a current of 40 A on full-loads. By how much must the main flux be reduced to raise the speed by 50% if the developed torque increased by 10 %arrow_forwardThe armature winding of a 200-V, 4-pole, series motor is lap-connected. There are 280 slots and each slot has 4 conductors. The current is 45A and the flux per pole is 18mWb. The field resistance is 0.3-ohm and the armature resistance 0.5-ohm. Find the speed of the motor.arrow_forward
- A 120 V shunt motor has an armature equivalent of 0.5 ohm and a field resistance of 60 ohm. At full load, the motor takes 10 A and the speed is 1000 rpm. At what speed must this motor maybe driven as a generator to deliver 10 A to an external load at 120 V?arrow_forwardWhich is the device in DC generators that converts AC into DC? stator brushes commutator armature This type of armature winding delivers high e.m.f. and low current. dummy or idle coils lap winding O frog-leg winding wave windingarrow_forward440 V, 50 Hz, 3-phase, wye-connected Induction Motor with the following particulars, R1= 0.075 ohm, X1=0.204 ohm, XM= 8.74 ohms, R2=0.063 ohm, X2=0.204 ohm NR @ full load=1560 rpm Find a. Stator current b. Pf of the stator c. Torque inducedarrow_forward
- What are the different applications of split-phase motor?arrow_forward4-What is the main function of a diverter used in series wound DC motor? 5- What is the main difference between (iron and friction losses) and copper (Cu) losses in DC generators? 05arrow_forwardA 500 V shunt motor running at 720 rpm takes an armature current of 50 A. The equivalent armature resistance is 0.4 ohm. What resistance must be placed in series with the armature to reduce the speed to 540 rpm while maintaining the same torque?arrow_forward
- A DC series motor of resistance 1 ohm across terminals runs at 1000 rpm at 250 V taking a current of 20 A. When an additional resistance of 6 ohm is inserted in series and taking the same current, the new speed would be ?arrow_forwardIn your opinion, what happens to the rotor speed and current when mechanical load on an induction motor increases? Barrow_forwardThe resistance of each of the two coil of a series motor is 0.04 ohm, armature resistance 0.04 ohm. The motor takes 50 A at 100 V while running at 800 rpm and the coils are in series, What will it speed if the coils are re- connected in parallel while the load torque is doubled?arrow_forward
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