These machines can be divided in two big groups, interior PM synchronous motor (IPMSM) or surface mount synchronous motor (SPMSM) which will be described later. Major disadvantages of these machines are their high manufacturing cost and the limited resources of rare-earth magnets.  B. Induction Machines Induction machines are the most used machines in industry, being the most developed and mature electrical machine technology. Major advantages in these machines are: a) experience technology; b) lower cost than PM machines; c) high efficiency; d) high starting torque.
I have written this science research paper to help people understand more about the electric motors and their operation. The electric motor transforms electrical energy into mechanical energy, which in turn makes motion possible. To better understand electric motors, one should first understand the basics of electric motors operation, electromagnetics. One can create an electromagnet by running an electric current through a wire which in turn will create a magnetic field. An electromagnet may only be a temporary magnet but it has the same magnetic properties as a permanent magnet.
This is implemented by using dsPIC for controlling the drive, as it provides higher efficiency and lower operating costs, (i.e.,) it reduces the cost of drive components. Key words: AC Induction Motor, SVPWM, dsPIC I.INTROUCTION The AC induction motor (ACIM) is the workhorse of industrial and residential motor applications due to its simple construction and durability. These motors have no brushes to wear out or magnets to add to the cost. The rotor assembly is a simple steel cage. ACIM’s are designed to operate at a constant input voltage and frequency, but you can effectively control an ACIM in an open loop variable speed application if the frequency of the motor input voltage is varied.
1 Today linear generators/motors have more widespread, not to mention less destructive, uses such as magnetically levitated trains, and renewable power generation. The Wire Magnet wire is the preferred type of wire used for the windings of linear generators and most other types of generators. This wire is made out of copper wire and insulated with a thin layer of enamel. The thickness of the insulation is much smaller than that of standard electrical wire. The reason for this is to allow for the wires to be packed in closer together while at the same time restricting the current from jumping between wires.
How this is accomplished is what sets each type of electric motor apart. DIRECT CURRENT MOTORS SIMPLE DIRECT CURRENT MOTOR 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. A direct current in a set of windings creates a polar magnetic field.
Electric motors have been just added into cars to make them more sufficient! Electric motors are becoming more and more popular and also better to use. It's come a long way and has paid off all its work it has done. It's been used to get you from place to place, and provide energy for your household appliances. You probably wouldn't have the nice air conditioning in the summer time if the electric motor was never invented.
Rolling-element bearings in electric motors support and locate the rotor, maintain a small and consistent air gap between the rotor and stator, and transfer loads from the shaft to the motor frame. The correct bearings for an application let a motor run efficiently across its design speed range, minimize friction and power loss, produce little noise, and have a long service life. On the other hand, bearings can be quickly ruined when a motor is used improperly. For example, the deep-groove ball bearings optimized for in-line couplers can overload if motors fitted with them drive a belt pulley. Likewise, motors containing roller bearings for heavy belt loads may prematurely fail when run with an in-line coupler because a minimum load is not maintained.
A power inverter, or inverter, is an electronic device or circuitry that changes direct current (DC) to alternating current (AC).  The function of an Inverter is to change the Dc input to a symmetrical AC voltage of desired magnitude and frequency. The output voltage could be fixed or variable at a fixed or variable frequency. A variable output can be obtained by varying the DC input voltage and maintaining the gain of the inverter constant.  Voltage and current waveforms produced by inverters are never perfect sinusoids (even for sine wave inverters); therefore some harmonic currents are expected during normal system operation.
The three phase induction motor is the most widely used electrical motor. Almost 80% of the mechanical power used by industries is provided by three phase induction motors because of its simple and rugged construction, low cost, good operating characteristics, absence of comutator and good speed regulation. In three phase induction motor the power is transferred from stator to rotor winding through induction. The Induction motor is also called asynchronous motor as it runs at a speed other than the synchronous speed. Induction motor is also called as asynchronous motor because it runs at a speed less than synchronous speed.
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.