Giovanni fcb
giovanni fcb

The Asynchronous Motor

The asynchronous motor which is also known as induction motor is an alternating current machine that rotates at a speed very close to the synchronous speed, that is, very similar to the synchronism with the frequency of the mains. This motor is produced with coils in its stator and has the torque in the rotor through currents induced in these coils modifying the magnetic field, that is, the voltage is induced in the rotor by electromagnetic induction, eliminating the need for brushed or sliding ring switching.


Most of the motors used in the industry are AC induction motors because of their simplicity, rugged construction and relatively low manufacturing costs. The rotor of the induction motors usually rotates at a slower rate L 5550 123 3A than the frequency supplied to it, and typically there is an exact slip or loss of speed during operation. This type of electric motor has advantages: low acquisition cost, low maintenance cost and long service life, and the disadvantages of the asynchronous motor is that it has high starting current, it needs a frequency inverter to control the speed and has a low power factor.

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Star-triangle start (Y – Δ)

During start-up, the torque and starting current are reduced to 1/3 of their nominal values, in which case an engine can only start with a star-delta key when its torque on the star connection is greater than of the axle load. Due to the low starting torque to which the engine is contained, the star-triangle wrenches are more appropriately used in starter motors. In industrial electrical installations, especially those overloaded, star-delta switches can be applied as a way to soften the starting effects of the electric motors.

It will only be possible to start an electric motor reelcraft with star-delta switches if it has six accessible terminals and has a nominal double voltage, such as 220/380 V or 380/660 V. Initially the procedure for motor starting is done connecting it in the star configuration until it achieves a velocity close to the regime velocity, when this connection is undone and the triangle connection is made. Switching of the connection during start-up is followed by a rise in current, so that the advantages of reducing it are added if the switching is anticipated from the ideal point.

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Single-phase induction motors

Single-phase motors are so called because their field windings are connected entirely to a single-phase source. Single-phase induction motors are the natural alternative to three-phase induction motors where three-phase power is not available, such as homes, offices, and in rural areas. Its application is justified for low power (1 to 2 KW). Amongst the various types of single-phase electric motors, squirrel-cage rotor motors stand out for their simplicity of manufacture and especially for their robustness and reduced maintenance requirements.

Because they have only one phase of power, it does not have a rotating field like three-phase motors, but a pulsating magnetic field. This will prevent them from having starting torque, taking into account that magnetic fields aligned with the stator field are induced in the rotor LD2030 163 9. To solve the starting problem we use auxiliary windings, which are sized and positioned to create a second dummy phase, which will allow the formation of the precise rotating field for starting. As we have single-phase induction motors we have shaded, split-phase, capacitor-starter, permanent-capacitor, and two-capacitor motors.

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