Derive an expression for the speed-torque characteristic of a series connected de motor shown below
Derive an expression for the speed-torque characteristic of a series connected de motor shown below
Homework Answers
IN A SERIES MOTOR THE FILED WINDING AND ARMATURE WINDINGS ARE CONNECTED IN SERIES.
SO THE CURRENT IS SAME IN FIELD WINDING AS WELL AS ARMATURE WINDING.
THE OTHER NAME FOR SPEED-TORQUE CHARACTERISTICS IS MECHANICAL CHARACTERISTICS.
FROM THE FIGURE IT IS CLEAR THAT THE SERIES MOTOR DEVELOPS HIGH TORQUE AT LOW SPEEDS AND VICE VERSA.
IT IS BECAUSE AN INCREASE IN TORQUE REQUIRES AN INCREASE IN ARMATURE CURRENT, WHICH IS ALSO THE FIELD CURRENT. THE RESULT IS THAT FLUX IS STRENGTHENED AND HENCE THE SPEED DROPS.
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Derive an expression for the speed-torque characteristic of a series connected de motor shown below
Derive an expression for the time taken by a dc series motor driving a constant torque...
Derive an expression for the time taken by a dc series motor driving a constant torque load to accelerate from a speed N1 (rpm) to N2 (rpm). The motor developed torque may be assumed to be inversely proportional to the speed. Hence, determine the energy dissipated in the armature circuit during the acceleration from N1 to N2.
Below shows a graph of speed vs torque characteristic of a 3-phase induction motor. Describe how...
Below shows a graph of speed vs torque characteristic of a
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Graph of Speed vs Torque Characteristic Torque (N.m) 0 2 00 400 600 1000 1200 1400 1600 800 Speed (r/min)
7. Compare the shunt wound de motor and, the series wound dc motor on the basis...
7. Compare the shunt wound de motor and, the series wound dc motor on the basis of a) starting torque b) starting urrent c) efficiency d) speed regulation
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The graph (in red) shows a plot...
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QUESTION 8 The speed-torque characteristic of an induction motor has been empirically determined as follows: Speed 147 440 41 1.3001.100 Torque 3 Speed 900 750 350 rev/min Torque 13 11 75 N-m 6 9 15 13 The motor will drive a load requiring a starting torque of 7 N-m and increase linearly with speed to 13 N-m at 1,500 rev/min. Find the steady-state operating point of the motor. Enter the one best answer (as a number without the units) from...
(20 pts) Derive the expression for the necessary magnetic flux ( function of am, for as...
(20 pts) Derive the expression for the necessary magnetic flux ( function of am, for as a operation of a DC motor in the constant power region. Recall that you can find the maximum power of the motor at the base speed. Your expression for ø should only be in terms of am, the base speed ob, and the maximum magnetic flux dmax. Note that the maximum torque is not a necessary parameter for determining the needed expression
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3. ADC motor is used to drive a load as shown below. The torque-speed characteristics is also sho...
3. ADC motor is used to drive a load as shown below. The torque-speed characteristics is also shown for e-5 V 1) Find the motor parameters Kf and Kb. 2) Find the transfer function H(s) 02(5)/E, (s). Find the poles of the system. edt)| Motor -Up: 1 kg-m- Λ= 1 kg-m- N2-20 M=10 2 kg-m? (f) D-: 32 N-m-s., rad N4 20 16 kg-m) T(N-m) RPM 600
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3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence it...
3. (25 points) Induction Motor Torque Production. An induction motor has the torque vs. speed curve shown below. By changing the machine's inputs or its parameters, we can influence its behavior. For example, cutting its terminal voltage by half yields the changes illustrated below Peak Torque at same speed t(slip) % of the Peak Torque Floalslip) Slightly reduced operating speed, but double the operating slip 2001000 100 200 slip) % of the Starting Torque We can influence its torque production...
Below shows a graph of speed vs torque characteristic of a
3-phase induction motor. Describe how the induction motor speed
varies as the motor torque increases.
Graph of Speed vs Torque Characteristic Torque (N.m) 0 2 00 400 600 1000 1200 1400 1600 800 Speed (r/min)
7. Compare the shunt wound de motor and, the series wound dc motor on the basis of a) starting torque b) starting urrent c) efficiency d) speed regulation
4. The below Torque vs load curve is Torque Peak Torque a typical characteristic curve for a stepper motor. Briefly discuss (1 or Startng forque (Stand still 2 sentence for each) about the keywords mentioned in the figure. Answer: No load speed Speed
The graph (in red) shows a plot of the torque-speed characteristic of a motor running at 20 V Position the movable line to show what the characteristic would look like with a 25 V supply. Use the mouse or arrow keys to move the circular markers at the ends of the line. Speed rad/s 10,000 9,000 8,000 7,000 6,000 5,000 4,000 3,000 2,000 1,000 엉-10-20-30-40 50- Torque Nm 60 70 80 90 100
The graph (in red) shows a plot...
QUESTION 8 The speed-torque characteristic of an induction motor has been empirically determined as follows: Speed 147 440 41 1.3001.100 Torque 3 Speed 900 750 350 rev/min Torque 13 11 75 N-m 6 9 15 13 The motor will drive a load requiring a starting torque of 7 N-m and increase linearly with speed to 13 N-m at 1,500 rev/min. Find the steady-state operating point of the motor. Enter the one best answer (as a number without the units) from...
(20 pts) Derive the expression for the necessary magnetic flux ( function of am, for as a operation of a DC motor in the constant power region. Recall that you can find the maximum power of the motor at the base speed. Your expression for ø should only be in terms of am, the base speed ob, and the maximum magnetic flux dmax. Note that the maximum torque is not a necessary parameter for determining the needed expression
(20 pts)...
3. ADC motor is used to drive a load as shown below. The torque-speed characteristics is also shown for e-5 V 1) Find the motor parameters Kf and Kb. 2) Find the transfer function H(s) 02(5)/E, (s). Find the poles of the system. edt)| Motor -Up: 1 kg-m- Λ= 1 kg-m- N2-20 M=10 2 kg-m? (f) D-: 32 N-m-s., rad N4 20 16 kg-m) T(N-m) RPM 600
3. ADC motor is used to drive a load as shown below. The...
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