Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 22, Problem 2SQ
To determine
Analyze the effect in the circuit (Figure 22-2), when the motor is operated by coil “M” becomes overheated.
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What is the rated full-load current of a ¾-horsepower, 208-volt single-phase motor
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 ?
A three-terminal manual starting rheostat has a resistance of 5.2 ohms in its starting resistor. The holding coil resistance is 10 ohms. This starting rheostat is connected to a shunt motor. The resistance of the armature is 0.22 ohm; the resistance of the shunt field is 100 ohms. The line voltage is 220VDC.
a. What is the starting surge current taken by the motor?
b. What is the current in the holding coil with the moveablew arm in the run position?
c. What is the CEMF with the movable arm in the on position if the armature current is 20 amps?
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- In Figure 362, how many different interlocking conditions exist? Name them. Fig. 362 Typical elementary diagram of a starter with two points of acceleration for a reversing wound rotor motor.arrow_forwardPlease answer this question. I have also added "Lab 5 To-do Test 1" below. //LAB5 To-do TEST1: Change this code to implement the behavior described in the prelab section "Programming the Stepper Motor" //Enable this code to test the stepper motor separately Serial.println("Turning clockwise"); //output message to serial monitor steppermotor.setSpeed(60); //set speed to make 20 rotations per minute (each rotation takes 2 seconds) steppermotor.step(300); //rotate clockwise by 300 steps (5 revolutions since STEPS is 60 //END TEST1arrow_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
- What is the sequence of operation in Figure 222? Fig. 222 Auxiliary contacts (or interlocks) used for automatic sequence control. Contact (M1) energizes coil (M2); contact (M2) energizes coil (M3).arrow_forwardIdentification of the physical system components and system integration: draw ablock diagram representing the QUBE-Servo 2 system indicating all the variables, signals,and the control system components. Please could you show what the in detail block diaagrams are given that the input and output of the servocontrol system are:• input: voltage of the motor in V;• output: inertia disk angular position in rad.arrow_forwardRefer to the basic control schematic in Figure 344. The limit switch is shown as a. normally open. b. normally closed. c. normally open held closed. d. normally closed held open. Fig. 344 Wiring diagram of manual speed regulator interlocked with magnetic starter for control of slip ring motor (three-wire control).arrow_forward
- Which of the following applies to an autotransformer starter with a five-pole starting contactor: open transition or closed transition? Locate in Figure 273.arrow_forwardWhat will happen in Figure 21–6 if limit switches are installed and the jumpers from terminals 6 and 7 to the coils are not removed? Herman, Stephen L.. Electric Motor Control (p. 201). Cengage Learning. Kindle Edition.arrow_forwardIdentify the DC Motor used in Conveyor belt system. With a neat sketch explain its working. List it's advantages and disadvantages. - Reference must be added in slide. - Materials to be prepared apart from handout.arrow_forward
- Determine the minimum current for conductors required to connect a motor that has a full-load current of 46 A.arrow_forward16.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 Y- connected, 10-KVA, 230- has a field winding resistance of 4.59. At an operation of 0.85 lagging power factor, the excitation current is recorded at 10A. the core loss is 300W, and the mechanical loss is 200W. If the corresponding efficiency is 84.9%. calculate the per- phase armature winding resistance.arrow_forward
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