Question

Can you do brief research on :

- Separetely excited DC motor applications

- Shunt DC motor applications

- Series DC motor applications

Answer 1

1.Applications of separately excited DC motor

In a separately excited DC motor the supply is given separately to the field and armature windings. The main distinguishing fact in these types of DC motor is that, the armature current does not flow through the field windings, as the field winding is energized from a separate external source of DC current.

So We can obtain very accurate speed by using separately excited DC motors. This motor is most suitable for the applications requiring speed variation from very low value to high value precisely. These motor are used in steel rolling mills, paper machines diesel electric propulsion of ships etc

2.Application of DC shunt motor:

DC shunt motor is a constant speed motor.Where the speed is required to remain almost constant from noload to full load.Where the load has to be driven at a number of speeds and any one of which is nearly constant.
Industrial use:

Lathes
Drills
Boring mills
Shapers
Spinning and Weaving machines.

3.Applications of DC series motors

Dc series motors are basically used where the requirement is high starting torque. In earlier days, it was used in cranes , lift,etc. But nowadays after the widespread use of vvvf drives became more prevalent, speed and torque control of ac induction motors became easy and economical and use of induction motors became more popular in almost all applications.

But in low power applications, series dc motors which can also be used as universal motors(motors which works both on ac and dc) are used like mixer, grinder, etc.

Mostly used for industrial applications like hoists, cranes, trolley cars, conveyors, elevators, air compressors, vacuum cleaners, sewing machines etc