Selection of Variable Frequency Drives
The size of a variable frequency drive (VFD) should be based on motor voltage and current and not on the torque or power rating. The voltage and full load current …
Electric Motors Derating factors
Like any other power system equipment, motors need to be derated to suit a high ambient temperature. Equipment that are usually manufactured in America, UK and Europe are based on …
Comparison of Common Induction Motor Starting Methods
Motor Starting Phenomenon The three-phase induction motors represent the most significant load in the industrial plants, over the half of the delivered electrical energy. Motor loads specially the medium and …
Effect of Voltage on Induction Motor Characteristics
Whenever the voltage at the terminals of an induction motor varies from its nameplate rating, either performance or life is sacrificed.The effect may be minor or serious depending upon the …
Specification Guide for Electric Motors
This simple and objective guide was created by WEG to help those who buy, sell and work with such equipment. It brings important information for the operation of various types …
NEMA Design Letters of Polyphase Squirrel-Cage Induction Motors
As per NEMA Standard MG-1, polyphase squirrel-cage induction motors may be one of the following. The four NEMA (National Electrical Manufacturers Association) designs have unique speed-torque-slip relationships – making them …