March 2014

Although WEG states that their motors usually comply with Design N, in many cases their typical actual torque values far exceed the minimum required by the standard. In most cases the values even exceed the minimum requirements of Design H. This means a very high speed-torque curve, bringing the following benefits: 1 ) Quick acceleration […]

Depending on the electric connection configuration, a three-phase induction motor can operate at any direction of rotation. The direction of rotation can be reversed by exchanging the position of two of the connecting leads. WEG motors are supplied with bi-directional fans unless only one direction of rotation is informed on the data sheet or on

ADVANTAGES OF AUTO TRANSFORMER STARTER: a ) On the 65% tapping the line current is approximately equal tp that of a Star-Delta starter, however, at the time of switching from reduced voltage to the full supply voltage, the motor is not disconnected so that the second peak is very much reduced since the transformer is

ADVANTAGES OF STAR DELTA STARTER: a ) Star-Delta starters are widely used due to their relatively low price. b ) There are no limits to the number of times they can be operated. c ) The components require very little space. d ) The starting current is reduced to approximately one-third. DISADVANTAGES OF STAR DELTA

Whenever possible a squirrel cage three-phase motor should be started direct-on-line ( D.O.L. ) by means of contactors. It must be taken into account that for a certain motor the torque and current values are fixed, irrespective the load, for a constant voltage. In cases where the motor starting current is excessively high, harmful consequences

Considering that an induction motor is a simple designed and rugged construction machine, its life time will exclusively depend on the quality level of the insulation materials. Motor insulation is affected by several factors including moisture, vibration, corrosive environments and others. Among all these factors, operating temperature of the insulating materials is the most critical.

The electric motor is a machine capable of converting electrical energy into mechanical energy. The induction motor is the most widely used type of motor, because it combines all the advantages offered by the electrical energy such as low cost, easy of supply and distribution, clean handling and simple controls – together with those of

A single prime mover – generator and substation No need for electric transmission connection to the wind farm (only to the Expandera-generator),  Wind turbine gear box requirements are greatly simplified (since the speed/torque characteristics of a wind turbine rotor are better matched to an air compressor than a generator). No need for natural gas or

Using the sun to dry crops and grain is one of the oldest and most widely used applications of solar energy. The simplest and least expensive technique is to allow crops to dry naturally in the field, or to spread grain and fruit out in the sun after harvesting. The disadvantage of these methods is

Solar stills are systems designed to filter or purify water. The number of systems designed to filter water have increased dramatically in recent years. As water supplies have increased in salinity, have been contaminated, or have experienced periods of contamination, people have lost trust in their drinking water supply. Water filtration systems can be as