motor, electric,
Machine that converts electricity into mechanical energy. When a power current is passed through a wire loop that’s in a magnetic field, the loop will rotate and the rotating motion is usually transmitted to a shaft, providing useful mechanical work. The traditional electric motor contains a conducting loop that’s mounted on a rotatable shaft. Current fed in by carbon blocks, called brushes, enters the loop through two slip rings. The magnetic field around the loop, given by an iron core field magnet, causes the loop to turn when current is usually flowing through it. Within an alternating current (AC) motor, the current flowing informed is synchronized to reverse direction at the moment when the plane of the loop is certainly perpendicular to the magnetic field and there is absolutely no magnetic drive exerted on the loop. As the momentum of the loop bears it around before current is again provided, continuous motion results. In alternating electric current induction motors the existing moving through the loop will not result from an external supply but is usually induced as the loop passes through the magnetic field. In a primary current (DC) engine, a device known as a split ring commutator switches the path of the current each half rotation to keep the same direction of motion of the shaft. In virtually any electric motor the stationary parts constitute the stator, and the assembly holding the loops is called the rotor, or armature. As it is easy to control the swiftness of direct-current motors by various the field or armature voltage, they are used where quickness control is essential. The swiftness of AC induction motors is set roughly by the motor structure and the frequency of the existing; a mechanical transmission must therefore be used to change speed. Furthermore, each different style fits only one application. Nevertheless, AC induction motors are cheaper and ac motor simpler than DC motors. To acquire greater versatility, the rotor circuit could be connected to various external control circuits. Most home appliances with little motors possess a universal electric motor that operates on either DC or AC. Where the expenditure is warranted, the speed of AC motors is usually controlled by using special tools that varies the power-collection frequency, which in the United States is usually 60 hertz (Hz), or 60 cycles per second. Brushless DC motors are constructed in a reverse fashion from the traditional form. The rotor contains a long lasting magnet and the stator has the conducting coil of wire. By the elimination of brushes, these motors provide decreased maintainance, no spark hazard, and better quickness control. They are widely used in computer disk drives, tape recorders, CD drives, and other electronic devices. Synchronous motors switch at a speed specifically proportional to the frequency. The largest motors are synchronous motors with DC passing through the rotor.

A machine that converts electrical energy into mechanical energy. The electric motor is a simple type of motor used in industry, transportation, homes, and elsewhere. Electric motors could be classified by the kind of current used for their drive. The DC motors have the advantage of a cost-effective and easy regulation of their rotational swiftness (rpm). The AC motors consist of synchronous and asynchronous electric motors. In a synchronous electric motor the rotational velocity (rpm) is rigidly reliant on the frequency of the feeder current. In an asynchronous engine the rotational speed decreases as the load increases. A third type of alternating current engine is the commutator engine, which permits a even regulation of rotational velocity within wide limits.

The asynchronous motor may be the most broadly used; it is easy to produce and is reliable in operation (particularly the squirrel-cage motors). Their main disadvantages certainly are a considerable usage of reactive power and having less a smooth (gradual) velocity regulation. In many high-power electrical drives, synchronous electrical motors are being used. DC motors are used if speed regulation is certainly of paramount importance; the more costly and less dependable 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. Electric motors have various forms of frame construction: open frame, where the rotating and current-carrying parts are protected against accidental touching and foreign objects; protected framework (including drop-evidence and spray-proof designs); closed frame (dust-evidence and moisture-proof); hermetic frame; and explosion-proof frame (in case of an explosion of gases in the engine, any flame is definitely confined to the inside of the motor housing).


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