Electric motors are the most common device for converting electrical energy into mechanical power. According to the laws of physics "whenever a current carrying conductor is placed in a magnetic field, it experiences a mechanical force"[1]. The Armature which is simply a coil of wires is places between two magnets. When the current is supplied through the armature an electromagnetic force is induced on it according to the Lorentz law so the coil will start to rotate. As the armature is connected to the commutator rings which is connected to power supply of opposite polarity. This guarantees that the rotation action is always in the same direction throughout the motion of the armature, so the coil will continue on rotating. This rotation is …show more content…
One of the advantages of PMDC is that it is very small and compact since a permanent magnet replaces the field coil. Another advantage is that it is efficient since it does not need input power for excitation so it uses less power and it can maintain a certain speed. As it is simple to manufacture this makes it cheap so makes it perfect to use for simple application with low budget. Some of the disadvantages is that the Motor could get ruined or stop working if the permanent magnet gets demagnetized. Also the speed of rotation cannot be controlled externally because we cannot control the field strength around the magnet since its permanent. …show more content…
The DC Shunt Motor unlike the DC Series Motor can regulate its speed when the load is applied. So for instance the motor starts rotating at certain torque and when a load is applied the torque or speed decreases initially but then it’s back to original speed. Due to this feature the motor is sometimes called constant speed motor. DC Shunt Motors can be used for industrial application where ever constant speed operation is required. [6] DC Compound Motors is essentially designed by the combination of a DC Shunt Motor and DC Series Motor. This design help combine the good proprieties from both motors to work together which makes it more useful and efficient. The DC Series Motor provides a high starting Torque and the DC Shunt Motor provides a constant speed or torque throughout the operation. Although the characteristics taken from both motors are not as efficient as they were when working separately but they fall between the two extreme limits.
A mousetrap-powered car is a vehicle that powers up and moves by the energy of a wound-up mousetrap’s spring. Its main components are the mousetrap, long metal rod, and the fishing line. In order to make the car work, the rod was wounded-up (wrapped) around the fishing line that had one end attached to the drive axle and the other end to the arm of the mousetrap, which pulls the snapper's lever arm closer to the drive axle. When the arms were released, the tension of the spring pulled the string off the axle. As a result, the fishing line string unraveled, causing the axle and the wheels to rotate, propelling the vehicle. There are various forms of energy that are involved with this car. First, it started off as potential (stored) energy that came from when the mousetrap was set by wounding the spring around the axle by the turning of the wheels, which caused the snapper’s lever arm to pull closer to the drive axle and the spring in the center was compressed. Since every action has an equal and opposite reaction, when the trap was released, most of the potential energy converted into kinetic (motion) energy, propelling the snapper arm forward. However, not all of the energy was converted into kinetic energy, as some of it was lost to the force of friction. Friction helped to spin the wheels and progress the car forward as when the string was pulled, friction between it and the axle caused the axle to rotate. In addition, the outside forces of friction caused the car to slow down and eventually come to a stop. Since energy cannot be destroyed, when the car came to a stop, the friction converted into thermal and heat energy.
...late 17th century, and beginning of the 18th century, transportation was favored by American society so much, the wealthier would hire chauffer’s to take people places. So not only did the motor produce a better and more efficient life style, it also created a huge business industry, as we know it today called, “valeting”. The actual motor worked like this. “Two cups filled with mercury would contain a magnet and a wire with one being fixed and the other free to move. Whenever a current was passed through the wire, the free moving magnet or wire would revolve around its fixed partner due to the electromagnet forces being produced.” (History of Innovation). This first motor was a prime example of the fact that movement could be created by electricity and electricity could be created by friction. This motor was the most useful and applicable invention in the 1800’s.
After Diesel’s death, the diesel engine underwent much development and became a very important replacement for the steam piston engine in many applications. Because the diesel engine required heavier, more robust construction than a gasoline engine, it was not widely used in aviation. The diesel engine became widespread in many other applications, however, such as a stationary engines, submarines, ships, and much later, locomotives, trucks, and in modern automobiles. Diesel engines are most often found in applications where a high torque requirements and low RPM requirements exist.
The future American commuter will undoubtedly have to transition from the use of fossil fuels to new alternatives due to the diminishing availability of the nation’s oil resources. How will America respond to this upcoming issue? It is difficult to predict which alternative fuel source America will ultimately choose, but with the premier of Nissan’s electric powered Leaf and other companies; such as Tesla Motors and Chevy, with their electric cars ready for market, the electric car may be winning the race to become the new standard for the gasoline alternative. Electric cars resolve long standing environmental issues, but it will need to maneuver around many roadblocks to become a marketable consideration for the general public. The cost of electric cars, currently on the market, makes them an impractical purchase for the average consumer. If cost is not the growing concern in today’s economy which prevents the consumer from considering this option; they may deny the technological advance due to battery storage capabilities and the inadequate infrastructure in place to refuel and provide for them.
A direct current in a set of windings creates a polar magnetic field. A torque acts on the rotor due to its relation to the external magnetic field. Just as the magnetic field of the rotor becomes fully aligned with the external magnetic field, the direction of the current in the windings on the armature reverses, thereby reversing the polarity of the rotor's electromagnetic field. A torque is once again exerted on the rotor, and it continues spinning.
Energy efficient motors use more copper and iron than regular motors. They also consume less energy than regular motors.
The annual report of the company shows status of the company’s business. Through the annual report of the company, creditors, investors, and everyone else can see the financial health of the business for the company. Fords and General Motors are two competitors in auto mobile industry area, and these two companies are most famous automobile companies that United States manufacturing businesses. Since these two companies are in same industry area, the investors compare these two companies which company is more worthy to invest their money. Annual report is financial certification that how a company was financially. Liquidity, solvency, and profitability are three way to compare these two companies financially.
A lot of scientists like the idea because it is advanced and they say it’s cleaner and safer in many
The setup of a Tesla Coil is quite simple actually it has two main parts the primary coil and the secondary coil. Each of the coils have their own capacitors which are used to store energy. A capacitor can almost be thought of as a battery because it holds energy that can be used. The only thing separating the coils is something called a spark gap. A spark gap is a gap between two electrodes which makes it so it can create a spark. The power source nowadays is a transformer that connects to the Coil making it create
Diesel engines are a marvel of the world and have been since creation in 1892. Today there are several types of these engines including, two-stroke and four-stroke engines as well as the idea of how diesel engines operate. The diesel engine is a necessary component of the shipping industry as well as the daily lives of people.
The necessity of motion to produce a current is due to the fact that electromagnetic induction involves a time-varying magnetic field. The same effects can be produced by moving the coil toward and away from a motionless magnetic source. In either case, the key to producing the current is certainly the motion of the magnet or the wire. The magnetic lines of the magnetic field must pass through a loop of the coiled wire.
...s a sense of assurance and confidence that even if their cars are low on battery power, they will have the chance to charge them and keep on going. Right now, a full charge takes a long time, but as technology evolves that charging time will most likely be shortened to a much more reasonable time.
It is the reason for the great technological movement of the 21st century. Its applications are used on a day-to-day basis. What is this form of energy? It is electricity. Electricity is defined as a form of energy from the existence of charged particles. The charged particles are either positive or negative (protons or electrons). Moreover, through the same principal, the phenomenon of magnetism is also applied on a day-to-day basis. Magnetism is defined as either an attractive or repulsive force between objects due to an electric charge. To thoroughly understand the strength of electricity and magnets, it is vital to first be cognizant of where and when they were discovered.
In 1831, using his "induction ring", Faraday made one of his greatest discoveries - electromagnetic induction: the "induction" or generation of electricity in a wire by means of the electromagnetic effect of a current in another wire. The induction ring was the first electric transformer. In a second series of experiments in September he discovered magneto-electric induction: the production of a steady electric current. To do this, Faraday attached two wires through a sliding contact to a copper disc. By rotating the disc between the poles of a horseshoe magnet he obtained a continuous direct current. This was the first generator. From his experiments came devices that led to the modern electric motor, generator and transformer.
How did technology affect us? Did it affect us in a positive or a negative way? Technology has both positive and negative effects, it’s plainly about how people choose to use it. Throughout these years, technology has been a great advancement for our country and it helped us develop in many ways that we can’t even count.