Electric motors nowadays are everywhere. Most of the electrical devicesyou use in your house, in toys, almost every mechanical movement that you seearound is caused by an AC (alternating current) or DC (direct current)electric motor. An electric motor is consisted from 6 parts which are thefollowing: Armature or rotor Commutator Brushes Axle Field magnet DC power supply of some sortIn general, there are a lot of typesof electric motors, but the type of the motor we are going to learn about inthis essay is the brushed DC motor.Figure 1. Brush DC Motor Whata Brushed DC Motor is? A Brush DC motor gives accuracy control of speed, driven by a coordinatecurrent.
Famous for an especially tall proportion of torque to dormancy, theBrush DC engine has the potential to supply three to four times more torquethat it’s appraised torque. On the off chance that required, it can indeed giveup to five times more, without slowing down. The motor comprises of sixdistinctive components: the pivot, rotor, commutator, stator, magnets andbrushes. The Brush DC Engine offers steady and ceaseless current, utilizingrings to control an attractive drive that works the motor’s armature. Maybe oneof the most punctual utilized engines, the Brush DC motor is commonly appliedsince of the capacity to differ the speed-torque proportion in nearly any way.
Howdoes 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 powerto stream to them. This produces an attractive field, which eventually pushesthe coils absent from the magnets they are confronting and causes the rotor toturn. The current close off at the rotor and makes a 180-degree turn, causingeach rotor to confront the inverse magnet.
As the current turns on once more,the power streams oppositely, sending another beat that causes the rotor toturn once more. The brushes that are found inside the motor turn it off and onwhen teaching by exchanging the power from the rotor. Figure 2. How does a Brush DCMotor operates Brush DC Motor Applications The Brush DC Motor is still suitably chosen for numerous applications. Thistype of motor is used in a wide extend of applications, extending from toys toJacuzzi pumps.
Most commonly, is found in most of the electrical devices wehave in our house but also, it can be found in the mechanical world since ofits flexibility in modifying its torque to speed ratio. Moreover, is especiallya favourite in the car industry since of its straightforwardness andreasonableness. Numerous car producers utilize them for control windows, seats,etc. Be that as it may, the motor can be found in about each industry extendingfrom computers to fabricating. A Brush motor comes in all different sizes, andtorque and speed specifications.Application of the motor on ahair dryer One of the most common and daily application of a Brush DC Motor can befound on a hair dryer machine.
A hair dryer is an electrical accessory utilizedto dry and fashion hair. It employments an electric fan to blow discuss over awarming coil, as the air passes through the dryer it warms up. When the warmair comes to damp hair it makes a difference dissipate the water. Hair dryersmay be used with the help of an assortment of brushes and combs to accomplishdiverse 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 theelectrical motor, the fan blade, copper wiring, switching mechanisms anddifferent other electrical components. The plastics used to make the exteriorshell of the hair dryer must be tough, however light-weight.
You can discover ahair 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. Afew models have an additional switch too, that lets you control the temperatureof the airflow. A hair dryer needs only two parts to generate theblast 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 toconvert electric vitality into convective warm. The entirety component is trulystraightforward: · When youplug in the hair dryer and turn the switch to on, current streams through thehair dryer.
· Thecircuit to begin with supplies control to the warming component. In themajority of the hair dryers, this is an uncovered, coiled wire, but in modelsthat are most costly there can be fancier materials in activity, like a tourmaline-infusedceramic coating. The current then makes the small electric motor spin, which turns the fan.· Theairflow 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 forcedconvection. The 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 ofan electrical circuitTheheating element 33 is associated to a power source of 120/240Vby a second power switch 50 through an electrical wire 52 tothe first power switch 48 and may incorporate a routine delaycircuit so that power is provided to the heating element 33 duringbrief periods when the comb is evacuated from an individual’s hair. The heatingelement is turned on when the first power switch is turned to the “on” positionwhich activates the fan and when the source sensor 54 sensesmoisture in the air. The sensor 54 is powered from a 12-voltDC by a step-down transformer 56 and is connected to the firstpressure switch 48. The step-down transformer provides 12 V D.C.
power to the sensor 54. Then when the sensor 54 sensesmoisture in an individual’s hair, it sends a signal along a connector 55 toan amplifier 58. An amplified signal is fed to the second powerswitch 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 heatingelement 33 and across. Then, when the sensor 54 failsto detect a predetermined amount of moisture in the hair an amplified signalturns the switch 50 to an “off” position so that relativelycool air is used in the final styling.
