Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 42, Problem 7SQ
To determine
Explain the reason for polarization of PFR with a DC coil.
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A DC machine with 2 poles, wave winded (retrogressive) (two layers) with 18 slots, the values of pole pitch and commutator pitch are
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Chapter 42 Solutions
Electric Motor Control
Ch. 42 - What are the two basic methods of automatically...Ch. 42 - What is an out-of-step relay?Ch. 42 - Why is an out-of-step relay used on automatic...Ch. 42 - Under what conditions will the out-of-step relay...Ch. 42 - What is the last control contact that closes on a...Ch. 42 - What influence do both of the polarized field...Ch. 42 - Prob. 7SQCh. 42 - Approximately how much time (in terms of...Ch. 42 - How does the AC coil of the PFR receive the...Ch. 42 - Why is a control relay (CR1) used in Figure 426?...
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- How does the AC coil of the PFR receive the induced field current without receiving the full field current strength?arrow_forward4. Explain the relationship between back emf E, terminal voltage V and coil voltage drop IR in DC motor and generator respectively. i. Describe how the field strength affect the performance of DC motor and generator. ii. Explain how an external resister changes the DC motor and generator performance.arrow_forwardThe Cathode Ray Oscilloscope (CRO) may be used in the observation of waveforms to do the measurements of voltage, current, phase and periodic time. Due to increased armature m.m.f, the armature reaction during load condition will decrease and hence the field flux will be increased. Select one: O True O Falsearrow_forward
- ANSWER ASAP WITHIN 1 HOUR...arrow_forwardA DC machine with 2 poles, wave * winded (retrogressive) (two layers) with 18 slots, the values of pole pitch and *: commutator pitch are a. 9,19 O b. 9,17 O c. 9,18 Oarrow_forwardImpact of different type of governors on Transient stability (i need more information plz)arrow_forward
- what would be the effective resistance & inductive reactance components of the coil.arrow_forwardWhich of the following could dictate the level to which the AC signal can be adjusted? a. Bias b. Resistance of the load resistor c. Capacitor and bias d. Capacitorarrow_forwardCREATE A WINDING TABLE, WINDING DIAGRAM, AND WINDING PLATE: (4 poles, 26 conductors, double layer, simplex WAVE winding) show the solutions if necessaryarrow_forward
- The OCC is measured by increasing the fieldcurrent in steps from zero to some maximum value, and recording the corresponding values of armature emf. If now the current is decreased from maximum to zero, the emf values will be different; why?arrow_forward1. Impedance is the total opposition to an AC circuit caused by electric penalty tions, the tra capa multiple pacitive systema 62 Fundamentals of AC Electricity Questions for This C a. 1. Draw a diagram of an AC sine wave and identify its peak voltage and peak-to-peak voltage levels. b. 2. Explain the term frequency as it refers to AC electricity. c. 3. Discuss the difference between a load center and a fused disconnect. 2. WE wa 4. Explain how you would test for voltage in a fusible dis- connect on the line-side and load-side terminals. vi ci 5. Trace the path of a generated AC voltage from the generat- ing station where it is produced to the point where you would connect it to a machine in a factory. Be sure to iden- tify all the important parts of the system between the gen- eration station and the disconnect on the machine. a. be 3. True or False inductive reactance, capacitive reactance, and resistan 2. The units of impedance arearrow_forwardThe single - phase ac voltage controller with inductive load. Plot the waveform of output voltage and voltage in each thyristor if the B = 10 %3D degree and delay angle (alpha) in both thyristor is 1- (30 degrees) 2- (90 degrees) 3- (120 degrees)arrow_forward
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