Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 22, Problem 5SQ
To determine
Redraw Figure 22-3 for the tripped out condition of motor M2 and M3 due to overload.
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3 phase , delta connection , 2 pole , 1000 Volt , 50 Hz asynchronous motor 2920 RPM
(friction losses will not be considered)
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d) effiency ?
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18.a. Why are wound-rotor motors successful in controlling the speed of printing-press drives?A. The shared load is large and does not change rapidly.B. The press runs for long periods without showing the effects of load variations.C. The operating speed of the press is normally below 700/0 synchronous speedD. Few steps of rotor resistance are used, which allows for instant acceleration
18.b. A series d-c motor is most likely to be used on aA. compressorB. woodworking machineC. blower.D. hoist
24.a. What type of drive is needed for a vertical lift bridge using two induction motors to operate the twoends of the bridge at the same time?A. Synchrotie driveB. Adjustable voltage driveC. Eddy-current couplingD. Adjustable frequency drive24.b. To prevent the motor speed from increasing until the motor fails mechanically, a load should always beconnected to aA. shunt d-c motor.B. series d-c motor.C. wound-rotor motorD. synchronous motor
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- The tag speed of the three-phase, 50 Hz ring asynchronous motor is 896 rpm and the number of stator grooves is 36. With the number of coils being 10, the stator without scissors given in the question are classified as frames.arrow_forward21.a. When field voltage is controlled to provide a method of variable speed control, the system is using aconcept known as fieldA. stability.B. drive.C. bias.D. weakening. 21.b. What type of motor has the same wire diameter in both the field and the armature coils?A. Interpole-woundB. Series-woundC. Compound-woundD. Shunt-woundarrow_forwarda 220-volt, 20-horsepower compound motor (long shunt) has an armature resistance of 0.25 ohm, series field resistance of 0.19 ohm, and shunt field resistance of 33 ohms. (a) calculate the current taken by the motor at the instant of starting if it is connected directly to the 220-volt line (b) calculate the current when the motor is running if the armature is developing 184-volts counter-emfarrow_forward
- 16.a. Enclosures housing motor control equipment in a dusty indoor environment where there is danger ofexplosion should be classified asA. NEMA 7.B. NEMA 12.C. NEMA 1.D. NEMA 9.16.b. Feedback is used in drive systems toA. remove the load quickly and accurately.B. give the drive information on the status of the motor and load.C. give operators information on the status of the drive.D. reduce the startup torque of the motor and load.arrow_forwardA 3-phase, delta connected, 440 volt (line to line), 50 Hz, 6 pole induction motor has the following constants, in ohms per phase referred to the stator:R1 = 0.4, R2* = 0.2, I2’=54A and stator current is 60A, Friction, windage and stray load losses = 300 Watts. For a slip of 3.00%, Calculate the airgap power, mechanical power developed and output power when the motor is operated at rated voltage and frequency.arrow_forwardA 3-phase, delta connected, 440 volt (line to line), 50 Hz, 6 pole induction motor has the following constants, in ohms per phase referred to the stator:R1 = 0.4, R2* = 0.2, I2’=54A and stator current is 60A, Friction, windage and stray load losses = 300 Watts. For a slip of 3.00%, Calculate the airgap power, mechanical power developed and output power when the motor is operated at rated voltage and frequency. Course : Machines and Drivesarrow_forward
- A 240V shunt motor, running on no-load and at normal speed, takes an armature current of 2.4 A froma 240Vsupply. The resistance of the field circuit is 240Ω, and that of the armature is 0.25Ω. Calculatethe motor output power and efficiency when drawing a line current of 35 A from the supplyarrow_forwardGiven a 25 hp, three-phase, 230-volt, squirrel cage induction motor. The ambient temperature of the place ofinstallation is 40°C. Use TW wiresarrow_forwardyour own words describe a common starting method that can be used to start induction motors. Your description of method should include the following: A description of the theory of the starting method supported by suitable diagrams and mathematical equations. A description of the practical implementation of the starting method supported by suitable diagrams. The advantages of the starting method compared to other methods. The limitations of the starting method.arrow_forward
- CRPET 2amEiNee 4 - Explain, resistance ? S - Why it without load 6 - Which is be wused in answer . in details, why it is necessary to is not possible to start the d. c. 2 use starting series motor perferable ( d. c. shunt or d. c. series motor ) to places require high starting torque ? prove yourarrow_forwardExcitation circuit internal resistance of a shunt excited DC generator of 150 kW, 250 V, 1350 rpmRf = 10 Ω, armature circuit internal resistance Ra = 0.05 Ω. Excitation to adjust the end voltage of the machineA rheostat of Rreo = 40 has been installed in its circuit. Friction and ventilation losses are neglected.According to this,a) When the entire rheostat in the excitation circuit is activated and the generator is operating under rated conditions,a1) Calculate the load current, excitation and armature currents.a2) Calculate the emf induced in the armature and the power taken from the shaft.a3) Calculate the efficiency with the moment taken from the shaft.b) Spindle revolutions are reduced to n = 1000 rpm. In this case, Va = 250 V and Ea value in (a)What value should the rheostat be adjusted to keep the value found constant? In this new situationCalculate the power given. NOTE:3. In question (a), the excitation rheostat is fully activated. Pay attention to this. NOTE 2:Since a and b…arrow_forward14-Which is the most effective and currently used method in asynchronous motor speed control methods?A) changing the number of polesB) changing voltage and frequency togetherC) changing the voltage frequencyD) changing the applied voltagearrow_forward
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