Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 7, Problem 3SQ
What are the advantages of a
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Chapter 7 Solutions
Electric Motor Control
Ch. 7 - What are control relays?Ch. 7 - What are typical uses for control relays?Ch. 7 - What are the advantages of a mechanically held...Ch. 7 - Why are mechanically held relays energy-saving...Ch. 7 - Why does the coil (CR) in Figure 719 drop out when...Ch. 7 - Which device is used to connect the load to the...Ch. 7 - Which device is used to connect the load to the...Ch. 7 - What is optoisolation?Ch. 7 - What type of device is used to suppress voltage...
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- Explain the operation principle of differential relayarrow_forwardThe armature circuit of a free excited direct current motor with a nominal voltage of 600 V is fed from an adjusted direct voltage source. The excitation circuit is also powered from a regulated voltage source. It is used in an application that requires motor speed adjustment. The speed of the motor at the nominal armature voltage was measured as 1600 rpm. All losses of the motor and voltage source and the effect of armature reaction are neglected. It is accepted that the engine is not saturated.Answer the questions below.a) Draw the armature and excitation circuit of the motor and write the formulas for the equivalent circuit.b) If the load moment of the motor at the nominal armature voltage is 420 Nm, then calculate the armature current and the input power of the motor.c) If the armature voltage of the motor is kept constant at 600 V and the excitation current is decreased until the speed reaches 4000 rpm, then calculate the shaft moment. Show this working area on the M = f (W) axis.arrow_forwardThe preferred method for applying the field excitation voltage uses a field relay which operates on the principle of A. speed application. B. time application.C. angle application. D. thermal application.arrow_forward
- 40 The armature, frame, and core of a 12-V DC control relay are made of sheet steel. The average length of the magnetic circuit is 12 cm when the relay is energized, and the average cross section of the magnetic circuit is 0.60 cm?. The coil is wound with 250 turns and carries 50 mA. Determine a. The flux density B in the magnetic circult of the relay when the coil is energized. b. The force F exerted on the armature to close it when the col is energized.arrow_forwardA de machine is controlled by the step-down de-de converter shown below. The armature inductance La =0.2 mH and the armature resistance can be neglected. The armature current is 5A. The Buck converter is operating at the switching frequency is 30 kHz and the duty ratio is 0.8. L₁ + Answer the following questions: 1) Calculate the input voltage (Va) if the output voltage (ea = 200 V). 2) Find the ripple in the armature current (a). 3) Calculate the maximum and minimum values of the armature current (la). 4) Sketch the armature current (ia (t)) and the supply current (id (t)).arrow_forwardDescribe the merits of buckhholz relayarrow_forward
- current - 1=?, and the power factor - cosp =?. 4. An out of balance three phase star connected load has the following complex currents: I₁ = lejº,A, I₂ =le¯6⁰,A and I₁=1e¹j6⁰, A. This load is supplied by a four wire power line from a balance voltage source. Find the r.m.s. value of the neutral current Io =? Wait to tharrow_forwardPlease answer only handwritten accepted...I will like that solution.. Please clear handwriting.. Please.. .arrow_forwardA d.c. motor connected to a 460-V supply has an armature resistance of 0.15 ohm Calculate:(a) The value of back e.m.f. when the armature current is 120 A.(b) The value of armature current when the back e.m.f. is 447.4 V.arrow_forward
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