Digital control allows more efficient motor control with variable speed and sensor-less control. The term sensor-less control means that there is no position/ velocity sensor on the motor shaft, so the rotor position/velocity is calculated from measured current and voltage. The sensor-less control provides a cost-effective and reliable solution that
Year: 2014
• Minimize energy losses • Prevent environment pollution • Decrease acoustic noise and power harmonics • Increase system performanceversus- cost ratio • Increase productivity, flexibility and robustness • Increase safety and reliability • Reduce system size and weight • Growth of digital control and reducing usage of analog components and
According to IEC 60034-5, the motor will be weather protected when due to its design ( technical discussion between customer and WEG ), the defined protections provide a correct operation of the motor against rain, dust and snow. WEG also uses the letter W to indicate the degree of protection
Service factor is the factor that, when applied to rated output, represents the allowable load that can be applied to motor continuously, under specified operating conditions. Note that this refers to continuous overload conditions, i.e., a power reserve that gives the motor a better capacity to withstand adverse operating conditions.
The brake motor consists of an induction motor coupled to a single-disc brake, forming an integral, compact unit. The induction motor is a totally enclosed fan cooled machine with the same mechanical and electrical performance of WEG general purpose motors. The brake is built with few movable parts which gives
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
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
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
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
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
