Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 29, Problem 2SQ
What is the principal reason for using star-delta motors?
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What types of motors contain brushes and a commutator? What is the function of these parts?
Explain the different methods of breaking DC Motors
a) Why do we use asynchronous word for asynchronous (induction) motors?
b) How are the three-phase windings placed in the stator of induction motors from the point of magnetic field axis?
c) What is the purpose of the winding ends taken to the outside in the wound-rotor induction motors?
d) In the cage structure rotors, in which mechanism are the bar conductors short-circuited?
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.Similar questions
- 2- Why is series DC motor used for accelerating heavy masses?arrow_forwardExplain speed current and torque current characterstics of d.c. series motor.arrow_forward"Explain why speed of a DC motor get affected on load, if its series field winding is connected reverse with respect to its shunt field winding ? "arrow_forward
- P-1).. Which of the following determine the amount of torque produced by a single-phase split-phase motor? a) The strength of the magnetic field of the stator b) The strength of the magnetic field of the rotor c) The phase angle difference between the current in the start winding and the current in the run winding d) all of the above P-2). The phase angle difference between the currents in the start winding and run winding of a single-phase split-phase motor is typically 90 degrees. a) true b) false P-3). A centrifugal switch is used to disconnect the________ winding of a non-hermetically sealed single-phase split-phase motor at approximately 75% of rated speed. a) run b) start c) either "a" or "b" d) neither "a" nor "b" P-4). Where an internal centrifugal switch cannot be used, an external______ relay can be used to perform the same function in a single-phase split-phase motor. a) hot-wire b) current c) solid-state starting d) all of the abovearrow_forwardJustify with suitable diagrams why reluctance motor is termed as variabletorque motor and hysteresis motor as constant torque motor.arrow_forwardReview/Explain with the aid of sketches the following excitation methods for a synchronous motor. DC EXCITATION, DC BRUSHLESS, AC EXCITATION.arrow_forward
- What effect does varying the DC incitation have on the stator currents of asynchronous motor? How can you increase the power output of a synchronous motor? What is electrodynamometer? Where is the power (heat) dissipated in the electrodynamometer?arrow_forwardWhy is the AC series motor often referred to as a universal motor?arrow_forwardWhat characteristic of wound rotor motors led to their wide use for industrial applications?arrow_forward
- the BLDC motors have the advantage of High Efficiency Compactness Low Maintenance All of the answers When the speed of the DC motor is Increases its Armature current Remain Constant Decreases Increases Any of the answers A variable reluctance stepper motor is constructed of .. . material with salient poles. ferromagnetic paramagnetic non-magnetic diamagneticarrow_forwardWhat type of speed control method provides above the normal speed of the DC series motor? O a. Armature control method O b. Armature resistance control O c. Field diverter O d. Flux control methodarrow_forward6. A 4 pole, 500V shunt motor has 720 wave connected conductors on its armature. The full load armature current is 60A and flux per pole is 0.03Wb. The armature resistance is 0.22 and contact drop per brush is 1V. What is the back emf? What is the developed torque?arrow_forward
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