Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 50, Problem 9SQ
To determine
Draw a schematic diagram of a circuit to reverse the polarity of series filed for a compound motor.
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Electric Motor Control
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- Section 5: Choose the correct Answer What happens if field winding of the synchronous motor is short * circuited First, starts as induction motor then run as synchronous motor Not start Motor will burn out Run as induction motor i da - When the field of a synchronous motor is over excited, the power factor will be Leading O Lagging Zero Unity The synchronous motors are not self-starting because The direction of torque on the rotor reverses after every half cycle. O Slip is not present in synchronous machine Starting winding is not present in the synchronous machine DC excitation is usedarrow_forwardDo the question belowarrow_forward(U.E.I., 0.2) 9. A shunt generator on test is separately excited and driven at 1000 rev/min. The open-circuit test figures are as follows: Field current (A) Induced e.m.f. (V) 0 0157 0-477 0-663 0-805 1-0 1-29 12:5 100 300 400 450 500 -550 The machine is then shunt-connected and run at 1000 rev/inin with a constant field-circuit resistance of 540 2. The armature-citcuit resistance is 1 0. Deduce and plot the load characteristic of this machine, neglecting the effect ol armature reaction. What is the ap- proximate value of the maximum load current ? 10. The onen.cirou (E MEILarrow_forward
- synchronous motorarrow_forwardAssume all of the timers are set for a 3 second delay. When the start button is pressed, nothing happens. None of the motors start. Which of the following could NOT cause this problem. a Overload contact OL1 is open b 1CR relay coil is open c 2CR relay coil is open d The stop button is openarrow_forwardThere are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for another 10 seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.(EKTS )arrow_forward
- There are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for 10 more seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit.arrow_forwardAssume that a substation supplies three different kinds of loads, mainly, S1=100KVA incandescent lights with PF1=1, S2=300KVA induction motors with PF2=0.7 lagging, and S3=100KVA synchronous motors with PF3=0.6 Leading, as shown in figure. Substation Eincandescent lights Elnduction motor loads ESynchronous motor loads The substation power factor is found from the total reactive and real powers of the various loads that are connected. Based on the given data and figure, Taking three digits after comma for PF, the total apparent power S and the total power factor PF of loads at substation will be: Select one: O a. S=394KVA & PF = 0.940 Ob. S-294KVA & PF = 1 O. S-394KVA & PF = 0.995 Od. None of these Oe. S-494KVA & PF = 0.995 Of. S=494KVA & PF = 0.940arrow_forwardThere are 2 1000Watt 3-phase asynchronous motors in a Walnut Cracking machine (it is desirable to operate the motors in a way that they will remain in star connection). When the "Start" button is pressed, the 1st engine will start immediately, 3 seconds after the 1st engine starts, the 2nd engine will also start. After the two engines work together for 4 seconds, the 1st engine will stop, the 2nd engine will start and stop for 10 more seconds. If the "Stop" button is pressed at any stage of the operations, the motors will stop. The rotation directions of the motors are required to be opposite to each other. Draw the necessary power and control circuit. need : https://veppa.com/ekts/arrow_forward
- c) Based on Figure 3 (c), a basic DOL starter induction motor at a power station is experiencing run-time error and unable to start, based on your understanding, interpret the sequence of troubleshooting shall be carried out to identify the root cause of the abnormalities. 3P 1P MCB MCB STOP K1 START MOTOR Figure 3 (c)arrow_forwardQUESTION 9 One of the dangers of Series motors is : They are inherantly unstable and should never be used. The motor can reach dangerous RPM if there is no load. The motor overheats quickly when loaded at 100% The CEMF will stop the motor too quickly when the load is suddenly reduced.arrow_forward"In plugging type of braking system of DC motor, the current in the series and shunt fields must not be reversed" True O Falsearrow_forward
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