Tesla Polyphase Induction Motors
Which motor is used when there is a wide variation in both torque and speed requirements, What is the most popular rotor in use for polyphase AC motors?.for
Most AC motors are induction motors. Induction motors are favored due to their ruggedness and simplicity. Nikola Tesla conceived the basic principles of the polyphase induction motor in and had a half horsepower watts model by By polyphase, we mean that the stator contains multiple distinct windings per motor pole, driven by corresponding time-shifted sine waves. In practice, this is two or three phases.
AC alternating current motors are low-cost and high-efficiency mechanisms used in large variety of applications. AC motors offer a simple design, consisting of a magnetically driven, copper wounded stator and a rotor mechanism. In AC motors, the input alternating current creates a rotating magnetic field over the stator, which ultimately moves the rotor, which is connected with an output shaft. From heavy industrial to household environments; different types and categories of AC motors have applications wherever electrical appliances are utilized. In synchronous AC motors, the speed of rotor is proportional to the stator, i.
An electric motor converts electrical energy into mechanical motion. The reverse task, that of converting mechanical motion into electrical energy, is accomplished by a generator or dynamo. In many cases the two devices differ only in their application and minor construction details, and some applications use a single device to fill both roles.
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Alternating Current AC is what power companies transmit through the electric wires. AC travels in both directions and is used so that transformers may raise and lower the voltage. Electric generators produce low voltage electricity and transformers are used to raise the voltage for long distance transmission. The power supplied at electrical outlets in homes is V or V single-phase. Single-phase means that only one voltage waveform is applied to the motor.
An AC motor is an electric motor driven by an alternating current AC. The AC motor commonly consists of two basic parts, an outside stator having coils supplied with alternating current to produce a rotating magnetic field, and an inside rotor attached to the output shaft producing a second rotating magnetic field. The rotor magnetic field may be produced by permanent magnets, reluctance saliency, or DC or AC electrical windings. Less common, AC linear motors operate on similar principles as rotating motors but have their stationary and moving parts arranged in a straight line configuration, producing linear motion instead of rotation. The two main types of AC motors are induction motors and synchronous motors. The induction motor or asynchronous motor always relies on a small difference in speed between the stator rotating magnetic field and the rotor shaft speed called slip to induce rotor current in the rotor AC winding. As a result, the induction motor cannot produce torque near synchronous speed where induction or slip is irrelevant or ceases to exist.
An electric motor converts electrical energy into kinetic energy. The reverse task, that of converting kinetic energy into electrical energy, is accomplished by a generator or dynamo. In many cases the two devices differ only in their application and minor construction details, and some applications use a single device to fill both roles. For example, traction motors used on locomotives often perform both tasks if the locomotive is equipped with dynamic brakes. Most electric motors work by electromagnetism , but motors based on other electromechanical phenomena, such as electrostatic forces and the piezoelectric effect, also exist. The fundamental principle upon which electromagnetic motors are based is that there is a mechanical force on any current-carrying wire contained within a magnetic field. The force is described by the Lorentz force law and is perpendicular to both the wire and the magnetic field.
Induction Motor – Types & Advantages
A motor with only armortisseur windings is called an induction motor. An induction motor is the most modest electrical machine from constructional point of view, in the majority of the cases. Induction motor works on the principle of induction where electro-magnetic field is induced into the rotor when rotating magnetic field of stator cuts the stationary rotor. Induction machines are by far the most common type of motor used in industrial, commercial or residential settings. It is a three phase AC motor.
The present invention relates to single and polyphase electromagnetic induction machines having regulated polar magnetic symmetry. With the advent of higher utility rates, power factor penalties and demand charges, prior art induction motors have many disadvantages. Most induction motors in use are over-sized and inefficient. As is known, the power factor involves the phase relationship between the a. Utility companies generally charge a premium to the user when the power factor falls below 0. When energy rates were low, these drawbacks were not as important as they now are. Often demand the total electrical power that needs to be available, but not necessarily used from the line and power factor penalties are as much or more than the basic energy charge.