What is the armature of an electrical machine? How does the armature of a DC machine...
What is the armature of an electrical machine? How does the armature of a DC machine differ from the armature of a synchronous machine?
Homework Answers
In electrical machine armature is a conductor which carries current. The windings are done on the armature core which if cuts the magnetic flux develops the electromotive force. The electromotive force can be only developed if there is relative motion between the flux and the conductor. The armature can be present either on rotor or stator.
In DC machine, the armature is present on rotor and it cuts the magnetic flux coming out from stator to produce the emf. In synchronous machine the armature is present on the stator.
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What is the armature of an electrical machine? How does the
armature of a DC machine...
1. Machine Overview. Please answer the following questions. Note: this is to test your comprehension of the basic concepts covered in class. For a DC Machine and Synchronous Machine: Name the...
1. Machine Overview. Please answer the following questions. Note: this is to test your comprehension of the basic concepts covered in class. For a DC Machine and Synchronous Machine: Name the two winding types for synchronous and de machines a. Identify which type of winding is used to control torque b. Of the winding types, which is wound on the stator? c. DC Machine: Synchronous Machine: nsidering the combined air gap MMF for the following machines, indicate which has rotating...
A 250V DC shunt machine has an armature resistance of 0.5Ω and shunt field resistance of...
A 250V DC shunt machine has an armature resistance of 0.5Ω and shunt field resistance of 125Ω, when it is running as a motor, the current taken from the supply is 5A. Calculate the efficiency of the machine i) On no- load ii) As a motor when taking a current of 52A from the supply iii) As a generator when delivering a current of 35A. b) Distinguish between induction motor and synchronous motor.
Problem 1 and an armature resistance of O.l A synehronous machine Ω per phase. If E.....
Problem 1 and an armature resistance of O.l A synehronous machine Ω per phase. If E.. 4601-10. V and V,-4S020. V, is this machine a motor or a generator? How much power P is this power O is this machine has a synchronous reactance of 1.02 per phase machine consuming from or supplying to the electrical system? How much reactive conuming from or supplying to the electrical system?
A 8-pole DC machine has an armature of radius 0.4m and effective axial length 0.3m. The...
A 8-pole DC machine has an armature of radius 0.4m and effective axial length 0.3m. The armature winding has 60 coils of 5 turns each and is simplex wave-wound with parallel path 2. The average flux density at the air-gap under each pole is 0.7T. Find the following: 0 The total number of conductors in the armature winding (11) Flux per pole Wb/m2 (iii) The machine constant ke or kt (iv) Induced armature voltage if the speed of the armature...
Discussion: Determine the synchronous reactance by neglecting the armature resistance ? How does the phase voltage...
Discussion: Determine the synchronous reactance by neglecting the armature resistance ? How does the phase voltage behave in case of ohms load, inductive load and capacitive load of synchronous generator? How can be control the terminal voltage to the rated voltage of synchronous generator?
A 10 kilowatt 100 volt 1,000 rpm dc machine has an armature resistance of 0.09 ohm...
A 10 kilowatt 100 volt 1,000 rpm dc machine has an armature resistance of 0.09 ohm and is connected to a 100 V dc supply. 1.2.1 Determine the starting current and the rated current if no starting resistance is used in the armature circuit. 1.2.2 Determine the value of the starting resistance if the starting current is limited to twice the rated current. (1 mark)
A train is driven by a DC motor with independent electrical excitation At a speed cf...
A train is driven by a DC motor with independent electrical excitation At a speed cf 1500 rpm the failowing magnetizanon characteristic has been measured Why is a voltage induced in the armature when the excitation current is 2ero (2 markah/marks Why does the induced voltage at high excitation curents not increase proportional to the axcitation current? (2 markah/marks
A train is driven by a DC motor with independent electrical excitation At a speed cf 1500 rpm the failowing magnetizanon...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
An armature-controlled dc motor operates at steady state, with an armature drive voltage va = 10 ...
An armature-controlled dc motor operates at steady state, with an armature drive voltage va = 10 V. The motor runs at 600 rpm, and the armature current is found to be ia = 0.2 A. The armature resistance is Ra = 15 Ω. Determine: (a) The torque constant km of the motor (b) Electrical damping constant be (c) The efficiency under the given operating conditions, if the mechanical damping constant is bm = 8.25 × 10−5 N ⋅ m/rad/s (d)...
An eight-pole, 25 kW, 120 V DC generator has a duplex lap-wound armature, which has 64 coils with 16 turns per coil. Its rated speed is 2400 rpm (HELP)
Question: An eight-pole, 25 kW, 120 V DC generator has a duplex lap-wound armature, which has 64 coils with 16 turns per coil. Its rated speed is 2400 rpm.(a) Define a duplex lap-wound DC armature. (b) How much flux per pole is required to produce the rated voltage in this generator at no load conditions? (c) What is the induced torque in this machine at rated load? (d) Determine path current in the armature of this generator at the rated load? ...
1. Machine Overview. Please answer the following questions. Note: this is to test your comprehension of the basic concepts covered in class. For a DC Machine and Synchronous Machine: Name the two winding types for synchronous and de machines a. Identify which type of winding is used to control torque b. Of the winding types, which is wound on the stator? c. DC Machine: Synchronous Machine: nsidering the combined air gap MMF for the following machines, indicate which has rotating...
Problem 1 and an armature resistance of O.l A synehronous machine Ω per phase. If E.. 4601-10. V and V,-4S020. V, is this machine a motor or a generator? How much power P is this power O is this machine has a synchronous reactance of 1.02 per phase machine consuming from or supplying to the electrical system? How much reactive conuming from or supplying to the electrical system?
A 8-pole DC machine has an armature of radius 0.4m and effective axial length 0.3m. The armature winding has 60 coils of 5 turns each and is simplex wave-wound with parallel path 2. The average flux density at the air-gap under each pole is 0.7T. Find the following: 0 The total number of conductors in the armature winding (11) Flux per pole Wb/m2 (iii) The machine constant ke or kt (iv) Induced armature voltage if the speed of the armature...
A train is driven by a DC motor with independent electrical excitation At a speed cf 1500 rpm the failowing magnetizanon characteristic has been measured Why is a voltage induced in the armature when the excitation current is 2ero (2 markah/marks Why does the induced voltage at high excitation curents not increase proportional to the axcitation current? (2 markah/marks
A train is driven by a DC motor with independent electrical excitation At a speed cf 1500 rpm the failowing magnetizanon...
3. A 20kW, 250V, 1000rpm shunt excited dc motor has armature and field resistances of 0.2 ohm and 2002. When the motor takes 80A rated current at rated conditions. Draw the equivalent circuit and calculate induced torque at 1200rpm. Explain the starting current limiting methods for DC motors. (30 pts) 4. Explain the conditions for parallel operation of synchronous generators. A three phase, wye connected, synchronous generator is rated 150 MW, 0.85 lagging power factor, 12.6 kV, 60 Hz, and...
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