Electric motors nowadays are everywhere. Most of the electrical devices
you use in your house, in toys, almost every mechanical movement that you see
around is caused by an AC (alternating current) or DC (direct current)
electric motor. An electric motor is consisted from 6 parts which are the
Armature or rotor
DC power supply of
In general, there are a lot of types
of electric motors, but the type of the motor we are going to learn about in
this essay is the brushed DC motor.
Figure 1. Brush DC Motor
a Brushed DC Motor is?
A Brush DC motor gives accuracy control of speed, driven by a coordinate
current. Famous for an especially tall proportion of torque to dormancy, the
Brush DC engine has the potential to supply three to four times more torque
that it’s appraised torque. On the off chance that required, it can indeed give
up to five times more, without slowing down. The motor comprises of six
distinctive components: the pivot, rotor, commutator, stator, magnets and
brushes. The Brush DC Engine offers steady and ceaseless current, utilizing
rings to control an attractive drive that works the motor’s armature. Maybe one
of the most punctual utilized engines, the Brush DC motor is commonly applied
since of the capacity to differ the speed-torque proportion in nearly any way.
does a Brush DC Motor Operates?
A Brush DC Motor comprises of two magnets confronting the same course,
the encompassing two coils of wire that dwell in the centre of the engine,
around a rotor. The coils are situated to confront the magnets, causing power
to stream to them. This produces an attractive field, which eventually pushes
the coils absent from the magnets they are confronting and causes the rotor to
turn. The current close off at the rotor and makes a 180-degree turn, causing
each rotor to confront the inverse magnet. As the current turns on once more,
the power streams oppositely, sending another beat that causes the rotor to
turn once more. The brushes that are found inside the motor turn it off and on
when teaching by exchanging the power from the rotor.
Figure 2. How does a Brush DC
Brush DC Motor Applications
The Brush DC Motor is still suitably chosen for numerous applications. This
type of motor is used in a wide extend of applications, extending from toys to
Jacuzzi pumps. Most commonly, is found in most of the electrical devices we
have in our house but also, it can be found in the mechanical world since of
its flexibility in modifying its torque to speed ratio. Moreover, is especially
a favourite in the car industry since of its straightforwardness and
reasonableness. Numerous car producers utilize them for control windows, seats,
etc. Be that as it may, the motor can be found in about each industry extending
from computers to fabricating. A Brush motor comes in all different sizes, and
torque and speed specifications.
Application of the motor on a
One of the most common and daily application of a Brush DC Motor can be
found on a hair dryer machine. A hair dryer is an electrical accessory utilized
to dry and fashion hair. It employments an electric fan to blow discuss over a
warming coil, as the air passes through the dryer it warms up. When the warm
air comes to damp hair it makes a difference dissipate the water. Hair dryers
may be used with the help of an assortment of brushes and combs to accomplish
diverse hair styles.
Figure 3. A Hair dryer and it’s iternal parts
Hair dryer basics
Hair dryers are massed from an arrangement of components counting the
electrical motor, the fan blade, copper wiring, switching mechanisms and
different other electrical components. The plastics used to make the exterior
shell of the hair dryer must be tough, however light-weight. You can discover a
hair dryer in almost any markdown store. Fundamental models have two switches,
one to turn them on and off and one to control the rate of the air current. A
few models have an additional switch too, that lets you control the temperature
of the airflow.
A hair dryer needs only two parts to generate the
blast of hot air that dries your hair:
· a simple motor-driven fan
· a heating element
How does a hair dryer work?
Hair dryers use the motor-driven fan and the warming component to
convert electric vitality into convective warm. The entirety component is truly
· When you
plug in the hair dryer and turn the switch to on, current streams through the
circuit to begin with supplies control to the warming component. In the
majority of the hair dryers, this is an uncovered, coiled wire, but in models
that are most costly there can be fancier materials in activity, like a tourmaline-infused
The current then makes the small
electric motor spin, which turns the fan.
airflow created by the fan is coordinated down the barrel of the hairdryer,
over and through the heating element.
· As the air flows,
over and through the heated element, the generated heat warms the air by forced
hot air streams out the end of the barrel.
Below is a simple circuit diagram of how does the hair dryer operates.
Figure 4. Blocked diagram of
an electrical circuit
heating element 33 is associated to a power source of 120/240V
by a second power switch 50 through an electrical wire 52 to
the first power switch 48 and may incorporate a routine delay
circuit so that power is provided to the heating element 33 during
brief periods when the comb is evacuated from an individual’s hair. The heating
element is turned on when the first power switch is turned to the “on” position
which activates the fan and when the source sensor 54 senses
moisture in the air. The sensor 54 is powered from a 12-volt
DC by a step-down transformer 56 and is connected to the first
pressure switch 48. The step-down transformer provides 12 V D.C.
power to the sensor 54. Then when the sensor 54 senses
moisture in an individual’s hair, it sends a signal along a connector 55 to
an amplifier 58. An amplified signal is fed to the second power
switch 50 which turns the second power switch to an “on”
position so that the heating element 33 is energized.
Therefore, the fan 46 blows air across the heating
element 33 and across. Then, when the sensor 54 fails
to detect a predetermined amount of moisture in the hair an amplified signal
turns the switch 50 to an “off” position so that relatively
cool air is used in the final styling.