What type of armature are used in DC generators?

What type of armature are used in DC generators?

– Drum-type armature. Drum-type armatures are wound with either of two types of windings – the LAP WINDING or the WAVE WINDING. The lap winding is illustrated in figure 1-14, view a This type of winding is used in dc generators designed for high-current applications.

What is required to turn the armature of a motor?

The armature must carry current, so it is always a conductor or a conductive coil, oriented normal to both the field and to the direction of motion, torque (rotating machine), or force (linear machine). The second role is to generate an electromotive force (EMF).

Which part of DC motor can sustain maximum temperature rise?

Field winding
Field winding in a DC motor is not a rotating part. It is present away from the rotating part of the machine. So, temperature rise in the machine will not produce any effect on the machine rotation. Thus, field winding can sustain the maximum temperature rise.

What are the two main parts of a DC generator?

A direct-current (DC) generator consists of two main parts, a rotating section and a fixed one. Stator is the stationary part of this system that includes a core, stator winding, and the outer frame and houses the rotor (the rotating part) in its core.

How does a rotating armature affect a DC motor?

A rotating armature in the presence of a magnetic field occurs in a counter EMF, limiting the current build-up in a series combination of armature and winding. Thus the series motors will offer maximum speed and torque once started but with increasing speed gradually, its torque will come down due to its low current.

What kind of materials are used for permanent magnet DC motor?

Generally, rare earth hard magnetic materials are used for these permanent magnet. Rotor : The rotor of PMDC motor is similar to other DC motor. The rotor or armature of permanent magnet DC motor also consists of core, windings and commutator.

What are the disadvantages of permanent magnet DC motor?

Disadvantages of Permanent Magnet DC Motor or PMDC Motor In this case, the armature reaction of DC motor cannot be compensated hence the magnetic strength of the field may get weak due to demagnetizing effect armature reaction.

How is an electro magnetic field generated in a motor armature?

Each wire is insulated with an enamel coating, isolating it from every other wire in the loop, and only terminates at a commutator bar. The turns in every coil wrap around the iron stack to create an electro-magnet. When energized, an electro-magnetic field is generated in the motor armature.