7.1 INTRODUCTION TO MOTORS Electric motor is a machine used to convert electrical energy to mechanical energy. In this project we used one DC motor, which is used as a fan that can controlled using android application. Electric motors are extremely important to modern-day life, being used in many different places, e.g., vacuum cleaners, dishwashers, computer printers, fax machines, video cassette recorders, machine tools, printing presses, automobiles, subway systems, sewage treatment plants and water pumping stations. The principles behind the operation of an electric motor are known as Ampere’s law and Faraday's law. The first states that when an electrical conductor is placed in a magnetic field, experience a …show more content…
The first, a static component which consists of magnetic materials and electrical conductors to generate magnetic fields of a desired shape, is known as the stator. The second, which also is made from magnetic and electrical conductors to generate shaped magnetic fields which interact with the fields generated by the stator, is known as the rotor. The rotor comprises the moving component of the motor, having a rotating shaft to connect to the machine being driven and some means of maintaining an electrical contact between the rotor and the motor housing (typically, carbon brushes pushed against slip …show more content…
A motor consists of a rotor and a permanent magnetic field stator. The magnetic field is maintained using either permanent magnets or electromagnetic windings . In any electric motor, operation is based on simple electromagnetism. A current-carrying conductor generates a magnetic field; when this is then placed in an external magnetic field, it will experience a force proportional to the current in the conductor, and to the strength of the external magnetic field. The internal configuration of a DC motor is designed to harness the magnetic interaction between a current-carrying conductor and an external magnetic field to generate rotational motion. Let's start by looking at a simple 2-pole DC electric motor (here red represents a magnet or winding with a "North" polarization, while green represents a magnet or winding with a "South"
In a DC motor, the armature consists of any number of windings, each one an electromagnet. The armature is immersed in a directional external magnetic field. This external field does not move, and can come from permanent magnets or electromagnets.
1) ABSTRACT: Relative motion between a magnetic field and a conductor are needed to create a voltage within the conductor. For current to flow the conductor must be a complete loop, if not the current will not flow.
According to James Trefil (2015), the author of Electric Motor, “Anyos Jedlik (1800–1895) used one coil of wire on a rotating rotor and another coil as a stator, analogous to a rotor except that it stays put.” This is how use their idea to created a motor.
James Clark Maxwell discovered relationships between electricity and magnetism many of which are used in the Electromagnetic Theory. More information on the relationship between magnets and electricity can be found here.
...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.
In addition, Tesla had many contributions to the world of technology. He utilized the alternating current motor. Regarded
In this day and age with oil prices rising and the recession hitting everyone, more people are looking for more ways to save on cost of the most used items. Electricity is the most common and used item people use in everyday life, but what they do not know is that there is a simpler way to produce electricity with magnets. How do magnets produce electricity? Why not use magnets to produce all electricity? These questions are common in people that research different avenues to provide electricity without having to spend a fortune on other renewable energy sources. Magnets and all their uniqueness is the key to the future discoveries and creation of new machines that produce electricity without using fossil fuels.
An armature rotates inside a magnetic field[3] in a DC motor[1].Based on the fact of the fundamental operating principle of a DC motor that whenever a current carrying conductor is placed inside a magnetic field, the conductor experienced mechanical force. All kinds of DC motors work on the same principle. Hence for developing a DC motor, it is important to establish a magnetic field. The magnetic field is established by means of a magnet[2].The magnet can be any sorts for instance it might be electromagnet or can be permanent magnet.
In the field, most of the motors are induction motors. Now-a-days, industry has become more concerned about the performance of the motor. By improving the efficiency of motors we can save energy, reduce operating costs, and improve the End-User Profitability. In case of any failure, motors usually can be rewind, it is often worthy to replace a damaged motor with a new one to save energy and improve reliability.
In the armature-controlled dc motor, the field armature is kept constant, so the equation can be written as
Tesla Motors utilizes an AC induction motor, which was invented by Nikola Tesla in 1888. In the article, How Tesla will change the world, author Tim Urban (2015) explains how an induction motor works:
A magnet also has two poles, called the north pole and the south pole. Although these poles appear the same, they act differently. If two magnets are close together, you’ll observe that unlike poles attract each...
Magnetism was not studied or utilized before 1821 as it is today. A few hundred years ago people understood how magnets worked, but didn’t have many applications of the magnet because they were limited by the technology of their time. The applications of magnets today have opened a new door as to how we can harness the power of a magnet. I had a basic working knowledge of how magnets worked, such as polarity, but with researching different aspects of the magnet I have learned that we need to advance the potential capabilities of the magnet and fully understand how we can harness the magnet. In my research I looked at how a magnet works, the physics behind a magnet, the magnetic fields of Earth, why can’t magnets be used as energy, and magnets for pain relief benefits.
Over the years my family has taken numerous road trips across the country. During these trips we would pass through countless wind farms which would peak my curiosity. Therefore, I decided to do some research into wind turbines.
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.