Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 57, Problem 2SQ
To determine
Explain the procedure to obtain the above base speed of a DC motor.
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Electric Motor Control
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- 7. The following table relates to the open-circuit curve of a shunt gen- crator running at 750 rev/min: Generated voltage (V) Ficld current (A) 10 172 300 360 385 395 0 1 2 3 4 5 Determine the no-load terminal voltage if the field circuit resistance is 125 N. If the speed is now halved, what is the resultant terminal voltage? At the reduced speed, what value of field circuit resistance will give a no-load terminal voltage of 175 V? (N.C.T.E.C., 0.2)arrow_forwardI want to represent each point on the graph paper with its corresponding scale written alongside it.arrow_forward(c) In analyzing load torque of a drive system, several components need to be taken into consideration. State and briefly discuss each component of load torque.arrow_forward
- Two identical 3-phase, 500-V induction machines are mechanically coupled for a back-to-back test. One machine is motoring from a 500-V, 50-Hz supply and the other is generating on to a 3-phase, 500-V synchronous machine for which the fre- quency can be controlled. It is required to run the motoring induction mạchine at 40 hp. Neglecting the slight change in the generating machine parameters due to oper- ating at a reduced frequency, estimate the rating of the synchronous machine for this duty and the frequency at which it must be run. Line input readings for each machine No load 500 V 8.5 A 1-6 kW Locked rotor 100 V 30 A 1-6 kW Friction and windage loss per machine 0-8 kW. R = R2'arrow_forwardExplain the DC Machine losses in briefly.arrow_forwardA shunt generator on dest is separately encited and driven at 1000 rev /min. The open circuit test chars. are given Field test CA o 0'157 O.477 0 663 O.805 1.0 129 Induced Emf CU) 12a5 300 400 100 450 500 550 ine mlc is then shunt Connected and gun at l000 revlmine with a constant field cicuit esistance of 540R. The agmature docuit resistamee is er. Deduce and plot the load Chargaetesistics of this mle,negleeting effeetof amarterre reaction.what is value of manimum lbud cursrent.arrow_forward
- 3. Find the transfer function, 0,(s)/E,(s), for the motor and load shown in the figure below. The torque-speed curve is given by Tm = -8awm + 200 when the input voltage is 100 volts. edt) Motor | N = 20 N2 = 100 N3= 25 Ja = 1 kg-m? Da = 5 N-m-s/rad DL = 800 N-m-s/rad N4 = 100 J = 400 kg-m²arrow_forwardDescribe the merits of buckhholz relayarrow_forward6. The block diagram of a video tape drive is shown in Figure Q.6. It is important for the quality of the video image that the tape spool is rotated at a particular reference speed, 0,. The actual speed of the tape, w, is sensed, and fed back, any error, E(s) being passed to the controller, G(s), which controls the torque motor. The tape is also subject to torque disturbance, D(s) due to frictional and other effects. a) It is proposed to use a simple proportional controller. Assuming there is no disturbance, calculate the necessary proportional gain, K,, if the maximum allowable steady state error is 2% in response to a unit step change in reference speed, w,. b) Derivative action is added to the controller. Calculate the necessary proportional and derivative gains K, and K, if the rise time is to be 0.04s and the peak time is to be 0.1s in response to a unit step change in reference speed, assuming no disturbance. c) Using the controller designed in part b), calculate the steady state…arrow_forward
- 6. The block diagram of a video tape drive is shown in Figure Q.6. It is important for the quality of the video image that the tape spool is rotated at a particular reference speed, m,. The actual speed of the tape, o, is sensed, and fed back, any error, E(s) being passed to the controller, G(s), which controls the torque motor. The tape is also subject to torque disturbance, D(s) due to frictional and other effects. a) It is proposed to use a simple proportional controller. Assuming no change in reference speed, calculate the necessary proportional gain, K„, if the maximum allowable steady state error is 0.01rad/s in response to a step disturbance torque of 1Nm. b) Derivative action is added to the controller. Calculate the necessary proportional and derivative gains K, and K,, if the maximum allowable overshoot in speed is 20%, and the speed must settle to its final value in less than 0.25s in response to a unit step change in reference speed, assuming no disturbance. c) Using the…arrow_forwardStep angle of a stepper motor drive with number of poles 8 and 50 rotor teeth is ...........arrow_forwardA250 V, dc shunt motar has an armeture resistance of 0.5 chmand a field resistance of 250 chm When driving a load of constant torque at 600 r.pm, the amature current is 20 A If it is desired to raise the speed from600 to 800 r.pm, what resistance should be inserted in the shunt field circut? Assume that the megnetic circut is unsaturatedarrow_forward
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