Learning Center

Bearing Currents

By Craig Hartman on 20th Mar 2014

Courtesy AegisMotor bearings have a higher failure rate when the motor is run with a VFD. This is due to currents in the motor bearings. The classic solution to this problem is insulated bearings. Insulated bearings insulate the b …

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Benefits of VFDs, Inverters, Drives

By Craig Hartman on 20th Mar 2014

Table of Contents Energy Savings with Variable Speed DrivesVariable Torque Versus Constant TorqueWhy Variable Torque Loads Offer Great Energy SavingsEnergy ConsumptionTighter Process Control with Variable Speed DrivesExtended Equ …

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What is a Variable Frequency Drive?

By Craig Hartman on 20th Mar 2014

A  Variable Frequency Drive (VFD) is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the electric motor. Other names for a VFD are variable speed d …

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How to Specify a Variable Frequency Drive

By Luke Lancaster on 20th Mar 2014

How to Specify a Variable Frequency Drive Table of Content Load Type for Variable Frequency Drives Motor Information Supply Power Control Methods for Variable Frequency Drives Speed Reference Alternatives Efficiency …

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High Voltage Spike (dV/dt) and Motor Protection Methods

By Craig Hartman on 20th Mar 2014

There are two different phenomena that can create high dV/dt and high peak voltages. Reflective Wave Phenomenon Voltage wave reflection is a function of the voltage rise time (dV/dt) and the length of the motor c …

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VFD Buying Guide

By Paul Rossiter on 17th Jan 2014

Finding the Best Variable Frequency Drive Finding the perfect VFD or motor controller isn’t easy. A lot depends on the unique needs of your application and system. There isn’t a catch-all model or brand to fall back on …

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