Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 50, Problem 7SQ
To determine
Explain the necessity of resistor R in figure 50-4(B).
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Branch-circuit conductors supplying a single continuous-duty motor shall have an ampacity not less than _____ rating
A. 125% of the motor’s nameplate current
B. 125% of the motors full-load current as determined by 430.6(a)(1)
C. 125% of the motor’s full locked-rotor
D. 80% of the motors full-load current.
TOPIC: Power Systems, Power Plants & IlluminationINSTRUCTIONS:- Answer in this format: Given, Illustration, Required Conversion, Solution, Final Answer.- Step-by-step solution, do not skip even simple calculations to avoid confusion.- If answered in written form, make sure it is readable.PROBLEM:In a group of 3 motors, one draws 15 A the other draws 40 A, and the third 52 A. What size of the conductor in terms of ampacity may be used for the feeder circuit?
107 A
120 A
134 A
160 A
A 12-phase ∆-connected 3200 V (line-to-line), 12,000 kW, 50 Hz, twelve-pole squirrel-cage induction drive is designed for electric vehicle use. The drive has the following equivalent parameter values in Ω/phase referred to the stator: R1= 0.697 Ω R2= 0.328 Ω Rm1 = 226 Ω X1 = 0.549 Ω X2 = 0.456 Ω Xm1 = 31.573 Ω The total friction, windage, and core losses are assumed to be constant at Plosses=1156 W, independent of load.a)Draw the equivalent circuit for this drive and show the relevant parameters on the circuit.For a slip value of s = 0.032 and using the above equivalent circuit parameters, determine: b) The stator current and the power factorc) The synchronous speed and the rotor speed for this drived) The torque generatede) The input power for this operating conditionf) The efficiency when operated at rated voltage and frequencyg) Considering the design of this motor, state if it is possible to start this drive with a slip ring starter. Give reasons to justify your answer
Chapter 50 Solutions
Electric Motor Control
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- Two shunt generators and a battery are all connected to common bus-bars. The open circuit voltage of the battery is 247 V. The open circuit voltage, armature and field resistances of the generators are 250 v, 0.12 ohms and 100 ohms respectively. Both the generators supply the same current when the load on the bus-bars is 40 A. Calculate the internal resistance of the batteryarrow_forwardSolve asap. Which motor is used the most in the industry and why? Explain well with diagram.surely give you upvote for proper solution.arrow_forwardTwo shunt generators and a battery are all connected to common bus-bars. The open circuit voltage of the battery is 247 V. The open circuit voltage, armature and field resistances of the generators are 250 v, 0.12 ohms and 100 ohms respectively. Both the generators supply the same current when the load on the bus-bars is 40 A. Calculate the internal resistance of the battery. ANSWER ASAP!arrow_forward
- Your assumption is that you measure Insulation Resistance [IR] using MeggerTest on an Induction Motor that works on a line voltage of 440 Volts 50 Hz with a measurable test result of 0.5 M Ohm. Question : a. What about your conclusion, is the measurement value still in accordance with the provisions of the Class Recommendation?. b. What are your actions to be able to maintain and maintain the best IR value of electric motors ?arrow_forwarda). If it is known that the total traction force in the Bung Tomo circuit is 231.9N, what is the required motor torque if the radius of the wheel is 0.2475 m?arrow_forwardA 10-HP, 110-V, 3-phase, Y-connected, 60 Hz, 4 pole inductionmotor has the following test data: No load: 110 V, 21 A, 650 WBlocked-rotor: 24 V, 51 A, 1040 WStator resistance between terminals: 0.08 ohmThe motor has wound rotor. Assume that both stator and rotor windings arewye-connected. a) If full voltage were applied to the stator with therotor terminals short-circuited, how much starting current would themotor draw? b) If the ratio of transformation per phase of the motor is2, with the rotor having the greater turns, how much resistance should beadded to each phase of the rotor to limit the starting current of themotor to 75 A, when the voltage is applied to the stator?arrow_forward
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