Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 36, Problem 4SQ
If one of the secondary resistor contacts (S2) fails in Figure 36–1, what will happen?
Fig. 36–1 Typical control circuit for accelerating a wound rotor motor with three steps of speed.
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A 460-V, 10 hp, 60 Hz, four-pole, Y-connected, induction motor has the
following parameters (R1 = .15, R2 = 0.154, XM = 20 ,X1 = 0.852 and X2 =1.066)
ohm , P( F&W) = 400W, P(misc)=150 W, P(core) = 400 W, For a slip of 0.02, find
(a) The line current IL (b) The stator copper losses PSCL (c) The air-gap power
!!
PAG (d) The power converted from electrical to mechanical form P(conv) (e) The
* induced torque (f) The load torque (f) the efficiency
A 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.
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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- 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.arrow_forwardQ1. Answer the following question briefly (not more than 4 lines) Why the rotor conductors of the squirrel cage rotor are short-circuited and in the case of slip-ring induction motors, the rotor circuit is closed through resistors? Q2. A -3-phase, 8-pole induction motor is required to be operated at about 700 rpm. If supply frequency is 60 Hz, determine its actual speed if slip is 5%. *arrow_forward14/ 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%].arrow_forward
- solve correctly and on priorityarrow_forwardA 110-V, 1-phase, 4-pole, 60-Hz induction motor has the following circuit constants: R1 = R2’ = 1.6 ohm,X1 = X2’ = 1.8 ohm, Xm = 60 ohm; core loss is 16 W and friction and windage loss is 12 W. Determine theefficiency of the motor at 0.04 slip by using (a) the exact equivalent circuit and (b) the approximateequivalent circuitarrow_forwardA three-phase, six-pole, 60 Hz, 230-volt wound rotor motor has its stator connected in delta and its rotor in star. There are 70 percent as many rotor conductors as stator conductors as stator conductors. Calculate the voltage and frequency between slip rings if normal voltage is applied to the stator when, a, the rotor is at rest, b. the rotor slip is 0.04arrow_forward
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