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Why the emf generated in the armature of a DC motor is called back emf?
When the armature of a DC motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence emf is induced in them as in a generator. The induced emf acts in opposite direction to the applied voltage V (Lenz’s law) and is known as Back EMF or Counter EMF (Eb).
What is emf of dc motor?
When armature of dc motor rotates, the armature conductors move through the magnetic field, emf is induced in them. The induced emf acts in opposite direction to applied voltage. This voltage is known as back emf.
What is the relationship between magnetic field and armature winding in a generator?
The armature windings interact with the magnetic field (magnetic flux) in the air-gap; the magnetic field is generated either by permanent magnets, or electromagnets formed by a conducting coil.
What are the two types of armature winding of a DC machine?
Generally, the armature winding in dc machine is wound by using two techniques and these are also known as types of an armature winding such as Lap Winding and Wave Winding.
What is field and armature winding?
The field of a synchronous generator is the winding to which the DC excitation current is applied. The armature is the winding to which the load is connected. In small generators, the field windings are often on the stator, and the armature windings are on the rotor.
What are the difference between the 2 armature winding?
Armature Winding is the winding, in which voltage is induced. Field Winding is the winding in which the main field flux is produced when the current through the winding is passed.
What are different types of winding?
Types of Motor Windings
- Stator Winding. The slot on stator core of the three-phase motor winding carries stator winding.
- Rotor Winding. In a motor, the rotating part is known as the rotor.
- Lap Winding. Lap winding is the one kind of armature winding.
- Wave Winding.