Table of Contents
- 1 What is the shape of induced emf in armature conductor of dc machine is?
- 2 How can induced emf in the armature conductor of a dc generator be made unidirectional?
- 3 Which emf is induced in the dc generator?
- 4 What is the nature of induced emf in the armature conductors of dc generator?
- 5 What is armature in DC machine?
- 6 When the armature of a DC motor rotates emf induced is in machine is called as self induced emf mutually induced emf back emf Cannot be determined?
- 7 What is the type of emf induced in armature conductors?
- 8 How is induced emf induced in a DC machine?
What is the shape of induced emf in armature conductor of dc machine is?
In a DC machine Air gap Flux density, and hence induced emf, attains a flat-topped wave shape. When one conductor sweeps through under one pole, it is expected to see a uniform flux, thus inducing a constant emf in it.
How can induced emf in the armature conductor of a dc generator be made unidirectional?
In a DC motor, the alternating current is produced by the rotation of the commutator. In the generator, the commutator facilitates the collection of current from the armature conductors and converts the alternating emf induced (AC) in the armature conductors to unidirectional emf (DC) in the external load circuit.
What is the shape of armature?
The armature MMF of a distributed armature winding of a dc machine is triangular in shape as shown in fig. In a D.C. machine, the armature M.M.F. wave has its maximum value at fixed points between the main poles.
When the armature of a DC motor rotates emf induced is?
A. Self-induced e.m.f.
Which emf is induced in the dc generator?
ac
The emf induced in the dc generator armature winding is ac, but we need dc current from dc generator. So to convert this ac current to dc current mechanical rectifier called as commutator is used.
What is the nature of induced emf in the armature conductors of dc generator?
The nature of the induced emf for a conductor rotating in the magnetic field is alternating. As conductor rotates in a magnetic field, the voltage component at various positions is different. Hence the basic nature of induced emf in the armature winding in case of dc generator is alternating.
Which emf is induced in the DC generator?
Which rule is used to determine the direction of induced emf in DC generator?
Fleming’s right-hand rule (for generators) shows the direction of induced current when a conductor attached to a circuit moves in a magnetic field. It can be used to determine the direction of current in a generator’s windings.
What is armature in DC machine?
DC Armature. The armature of an electric machine is the name historically given to the winding where a voltage is induced and power transfer between electrical and mechanical systems occurs. It is a term used in dc machines and ac synchronous machines. In a dc machine, the armature is the rotating circuit.
When the armature of a DC motor rotates emf induced is in machine is called as self induced emf mutually induced emf back emf Cannot be determined?
Explanation: According to terminology used in DC machines, emf induced in a machine when armature rotates is called as back emf. This back emf value is directly proportional to the speed of the motor.
How does the back emf affect the current flowing in the armature?
The decreased back emf allows a larger current to flow through the armature and larger current means increased driving torque. Thus, the driving torque increases as the motor slows down. The motor will stop slowing down when the armature current is just sufficient to produce the increased torque required by the load.
How is emf induced in armature winding?
Induced emf As conductor rotates in a magnetic field, the voltage component at various positions is different. Hence the basic nature of induced emf in the armature winding in case of dc generator is alternating. To get dc output which is unidirectional, it is necessary to rectify the alternating induced emf.
What is the type of emf induced in armature conductors?
ELECTRICAL MACHINES – II Emf induced in the armature conductors: The voltage induced in the conductors is an alternating one and is converted into DC using commutator segments as shown in the figure.
How is induced emf induced in a DC machine?
In a DC machine Air gap Flux density, and hence induced emf, attains a flat-topped wave shape. When one conductor sweeps through under one pole, it is expected to see a uniform flux, thus inducing a constant emf in it. When it sweeps through under the next pole, induced emf is still constant but the polarity is now reversed.
What is the EMF equation of the DC generator?
The emf equation of the DC generator is given by the equation: \\(E_g=\\frac{P\\phi ZN}{60 A}\\) where. Z is the total number of armature conductor. P is the number of poles in a generator. A is the number of parallel lanes within the armature. N is the rotation of armature in r.p.m. E is the induced e.m.f in any parallel lane within the armature
What is the difference between DC EMF and AC EMF?
As the number of conductors and the commutator segments increases, the DC output emf also increases and becomes more and more smoother. The emf induced in the armature is always an AC emf. Using commutator segments, the DC emf is collected and AC emf is collected using slip rings.
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