motor, electric,
Machine that converts electrical energy into mechanical energy. When a power ac motor current is passed through a wire loop that is in a magnetic field, the loop will rotate and the rotating motion can be transmitted to a shaft, providing useful mechanical work. The original electric motor contains a conducting loop that is mounted on a rotatable shaft. Current fed in by carbon blocks, known as brushes, enters the loop through two slip rings. The magnetic field around the loop, supplied by an iron primary field magnet, causes the loop to carefully turn when current is usually flowing through it. In an alternating current (AC) motor, the current flowing informed is synchronized to invert direction at the moment when the plane of the loop can be perpendicular to the magnetic field and there is absolutely no magnetic push exerted on the loop. Because the momentum of the loop carries it around before current is again supplied, continuous motion results. In alternating current induction motors the existing moving through the loop will not result from an external supply but is certainly induced as the loop passes through the magnetic field. In a primary current (DC) motor, a device known as a split ring commutator switches the path of the existing each half rotation to keep up the same direction of movement of the shaft. In any electric motor the stationary parts constitute the stator, and the assembly having the loops is called the rotor, or armature. As it is easy to control the swiftness of direct-current motors by different the field or armature voltage, they are used where acceleration control is essential. The rate of AC induction motors is set roughly by the engine construction and the frequency of the existing; a mechanical transmission must therefore be utilized to change speed. Furthermore, each different style fits only 1 application. Nevertheless, AC induction motors are cheaper and simpler than DC motors. To acquire greater flexibility, the rotor circuit could be connected to various exterior control circuits. Most kitchen appliances with little motors possess a universal engine that operates on either DC or AC. Where the expenditure is warranted, the swiftness of AC motors is definitely controlled by employing special devices that varies the power-line frequency, which in the United States can be 60 hertz (Hz), or 60 cycles per second. Brushless DC motors are constructed in a reverse style from the traditional form. The rotor consists of a long lasting magnet and the stator gets the conducting coil of wire. By the elimination of brushes, these motors provide decreased maintainance, no spark hazard, and better quickness control. They are trusted in computer disk drives, tape recorders, CD drives, and various other electronic devices. Synchronous motors change at a speed exactly proportional to the frequency. The very largest motors are synchronous motors with DC passing through the rotor.
A machine that converts electricity into mechanical energy. The electric motor is a basic type of motor used in market, transportation, homes, and elsewhere. Electric motors can be classified by the kind of current used because of their drive. The DC motors have the advantage of an economical and clean regulation of their rotational velocity (rpm). The AC motors consist of synchronous and asynchronous electric powered motors. In a synchronous electric motor the rotational quickness (rpm) is rigidly dependent on the frequency of the feeder current. Within an asynchronous engine the rotational swiftness decreases as the load increases. A third kind of alternating current engine is the commutator electric motor, which permits a even regulation of rotational quickness within wide limits.
The asynchronous motor may be the most widely used; it is easy to manufacture and is reliable in operation (specially the squirrel-cage motors). Their main disadvantages certainly are a considerable consumption of reactive power and having less a smooth (gradual) quickness regulation. In many high-power electric drives, synchronous electrical motors are being used. DC motors are used if speed regulation is definitely of paramount importance; the more expensive and less reliable AC commutator motors are very occasionally found in these cases. The energy rating of electrical motors ranges from a fraction of a watt to a large number of megawatts. Electrical motors have various forms of frame construction: open up frame, where the rotating and current-having parts are guarded against accidental touching and foreign objects; protected framework (including drop-proof and spray-proof designs); closed frame (dust-proof and moisture-proof); hermetic frame; and explosion-proof frame (in case of an explosion of gases in the motor, any flame is definitely confined to the interior of the motor housing).