Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 36, Problem 5SQ
In Figure 36–2, how many different interlocking conditions exist? Name them.
Fig. 36–2 Typical elementary diagram of a starter with two points of acceleration for a reversing wound rotor motor.
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Find the number of resistance sections and the resistance of each section of a starter for a 3.7 kW, 230 V, dC series motor from the following data:-Starting current varies from 1 to 1.5 times full load current Full load efficiency = 85%
Motor circuit resistance 1.4 ohm
Assume flux increases by 10% as the current rises from 1 to 1.5 times the rated full load current.
14/ If the star-connected rotor winding of a 3-phase induction motor has a resistance of 0.010per
phase and a standstill reactance of 0.08 2 per phase, what must be the value of resistance per
phase of the stator to give a maximum starting torque? What is the percentage slip when the
starting resistance has been reduced to 0.022 per phase if the motor is still exerting the maximum
torque?
Ans[0.072: 37.5%].
14.a. The reason for using a laminated stator core in a universal motor is toA. limit the eddy currents and the iron losses.B. limit the saturation of the magnetic circuit.C. maintain a constant level of magnetic flux.D. decrease the doc reactance of the field winding.14.b. If an induction motor has two protective housings for capacitors, it is aA. single-voltage capacitor-start motor.B. permanent-split capacitor-start motor.C. capacitor start-and-run motor.D. dual-voltage capacitor-strut motor.
Chapter 36 Solutions
Electric Motor Control
Ch. 36 - Are the secondary resistors connected in three...Ch. 36 - Do secondary resistors on starters with three or...Ch. 36 - Does reversing the secondary rotor leads mean that...Ch. 36 - If one of the secondary resistor contacts (S2)...Ch. 36 - In Figure 362, how many different interlocking...Ch. 36 - Referring to Figure 364, why is it not possible to...Ch. 36 - Prob. 7SQCh. 36 - If there is a locked rotor in the secondary...Ch. 36 - Why is it necessary to remove the jumpers in...Ch. 36 - Prob. 10SQ
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- 53. A 200 W, 230 V, 50 Hz capacitor-start mo- tor has the following winding parameters: Main winding: R = 4·5 Q2 ; X₁ = 3·7 Q What should be the angle between input voltage and starting winding current to give maximum starting torque? (1) 38.2⁰ (iii) 50-4⁰ (ii) 24-6° (iv) 32.7°arrow_forwardtorque. Q14/ If the star-connected rotor winding of a 3-phase induction motor has a resistance of 0.012per phase and a standstill reactance of 0.08N per phase, what must be the value of resistance per phase of the stator to give a maximum starting torque? What is the percentage slip when the starting resistance has been reduced to 0.022 per phase if the motor is still exerting the maximum torque? Ans[0.072; 37.5%] 015/ A 4.nole 3 nhoco 50 Uu inulu uarrow_forwardQ2 A DC shunt motor is connected to a 220 V supply. Figurel below shows the time/current characteristics with a resistance starter. If armature resistance is 0.12 0, a) What is the maximum current that is flowing in the armature at the instant of starting? b) What is the minimum current in the armature? c) How many sections does this starter resistance have? Show your work. d) Calculate the required starter resistance required to limit the current to the maximum value. 270 162 t2 tsarrow_forward
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