rotor position are the A. field-effect sensors. B. optical-range sensors. C. hall-effect sensors. D. capacitive sensor. 25.b. An encoder is being used instead of a tachometer in a DC servo system. This system of speed control is called A. dual-purpose feedback. B. open-loop feedback. C. dual-connection feedback. D. bit counting.

rotor position are the A. field-effect sensors. B. optical-range sensors. C. hall-effect sensors. D. capacitive sensor. 25.b. An encoder is being used instead of a tachometer in a DC servo system. This system of speed control is called A. dual-purpose feedback. B. open-loop feedback. C. dual-connection feedback. D. bit counting.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter56: Magnetic Clutch And Magnetic Drive

Section: Chapter Questions

Problem 4SQ

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1. In CNC machine tools, the motors used to control feed rate are: A. Servo motors B. Induction motors C. Stepper motors D. Hydraulic motors 2. The purpose of a feedback device in a CNC machine tool is to provide information of: A. Speed B. Displacement C. Force D. Both speed and displacement 3. Federate on a machining center can be specified in: A. Only feed per revolution B. Either feed per minute or feed per revolution C. Only feed per minute D. Feed per tooth per revolution 4. The correct syntax of an NC block for inclined line milling operation is: A. N-G01 X-F B. N-G01 Z-F C. N-G01 X-Y F D. N-G01 M XY F 5. When the contour or continuous path system is used, A. Tool movement from one point to the next does not have to follow a specific path. 8. Tool travel is controlled along one axis at a time. C. Machine and tool movements are precisely controlled at all times and in all planes. D. None of the above. 6. Which of the following NC blocks is correct? A. N10 G01 M03 X90 Y-15 R22 B.…
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1. Single phase full converter is used to control the speed of separately excited DC motors. AC supply voltage is 208 V. Motor armature and field resistance are 0.5 2 and 345 2 respectively. The field current is also controlled by a full converter and the field current is set as the maximum possible value. Motor voltage constant is 0.7 V/A-rad/sec. If firing angle is 45° and armature current is 55 A, determine the angular speed of the motor. Assume armature and field current are ripple free.
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A DC chopper is used in regenerative braking mode of a dc series motor. The dc supply is 600 V, the duty cycle is 70%. The average value of armature current is 100 A. It is continuous and ripple free. What is the value of power feedback to the supply ?
A 5HP 230V 1500 rpm shunt motor has an armature resistance including brushes of 0.175 ohm, the shunt field resistance is 610 ohms and the stray losses equal to 305W. The input at rated load is nearest to: a. 4250 W b. 4050 W c. 4350 W d. 4150 W
The input current to a 220v, compound motor at no load is 6 A. The shunt field circuit resistance is 220 ohms; the armature resistance is 0.10 ohm and the series field resistance is 0.80 ohm. What is the SPL? A. 1153.31 W B. 1066.22 W C. 1232.54 W D. 1073.25 W
power electronics and drives
4
A 48kW, 600V, 1500 rpm separately excited dc motor is controlled by single phase semi-controlled converter. The resistance of the armature is 192 and of the field is 1450. The field circuit is controlled by a single phase fully controlled converter and its firing angle is set to 20. The AC supply voltage to the armature and field converters is a single phase 220V, 60 Hz. The voltage constant is 0.946 V/A rad/s. If the armature converter firing angle is 45 and the speed is 1200 rpm; calculate the armature current and the developed torque.
A separately excited dc motor operating from a single phase semi-controlled converter at a speed of 2000 rpm. The field current which is controlled by a single phase fully controlled converter is set to the maximum possible value. The ac supply voltage to the armature and field converters is a single phase 230 V, 50 Hz. The back emf is 80V and the firing angle of the armature converter is 30. The resistance of the armature is 20 and of the field is 52. Calculate the armature current and the .developed torque
7- The increase of the DC voltage feeding the switched reluctance motor will increase: a- Its speed. b- Its torque. c- Its efficiency. 8- The increase of the DC voltage feeding the stepper motor will increase: a- Its slew range. b- Its efficiency c- Its reliability 9- The reluctance motor is used in applications in: a- Calm environment. b- Harsh environment. c- Polluted environment. 10- The stepper motor used in a- Position control application. b- High speed applications. c- Heavy duty applications.