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VFD Variable Frequency Drive Questions and Answers

Question: Why the VFD operated Motor produces more Torque than across the line?Answer: Starting an ac motor across the line causes a high current (locked rotor current) to flow due to the difference between the stator rotating field and the rotor rotating field. At the initial start point the two frequencies have a 100% difference which requires the lock rotor current to flow (left chart). As the rotor speed increases, the difference in the two frequencies is reduced and the...

Motors and Drives ARTICLES

How Does a VFD Work?

How Does a VFD Work? A Variable Frequency Drive is an...

Efficiency Opportunities Through Motor Maintenance

The electricity consumed by a motor in one year costs more...

Variable Frequency Drive Training - Learn Motor Controls

Variable frequency drives are becoming increasingly common in industrial applications. They...

DC Motor Speed Control Explained

DC motor speed control is a critical skill for industrial electricians...

How Does an Electric Motor Work?

How Does an Electric Motor Work?Electric motors are everywhere: from power...

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