Variable Frequency Drives

What are the main types of Motor Starters and Drivers?  

1. DOL type ., 

2. Star to Delta Conversion., 

3. Variable Frequency Drives.

Which is Better Choice to Motor?

1. DOL Suitable For 1 to 5 HP ( 0.75KW to 3.7KW)..

2. Above 5HP( 3.7KW) it is recommended for Star to Delta Conversion..
 
3. For Energy Efficiency and Smooth Starting of Motor Variable Frequency Drives have more Advantage than above ...

4. For Applications Like Air and Vacuum Compressors Variable Frequency Drives Are Effective In Energy Saving... Controlled Internal Heat generation Due to Soft Starting of Motor..

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