Vfd Delta 54715y

Variable Frequency Drive Donald Kaulukukui

What is a VFD?   

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Variable Frequency Drive (VFD) A VFD can be used to control both the speed and torque of a standard induction AC electric motor. It varies both the frequency and amps of the AC waveform being delivered to the motor saving money in electricity. Basic components of a VFD:  Input section, draws AC electric power from the utility, Rectifier section, converts the AC into DC power.  Inverter section, converts DC back into a controllable AC waveform.

Purpose of the VFD 

VFDs help to limit demand and electrical consumption of motors by reducing the amount of energy they consume.  Standard

motors are constant speed and when they are energized they run at a 100% no matter the load.  Soft Start  Only use energy you need

Potential Problems Improper Circuit Design  Harmonic Distortion  Safety  3 phase generation  Microcontroller programming 

Expectations Learn pulse width modulation techniques  Learn application of microcontroller features  Learn advanced circuit design  Learn AC motor theory  Learn energy conservation methods 

Goals 

Single phase 120V 60 Hz AC generation

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Three phase 220V 60 Hz AC generation

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Three phase 220V Variable Frequency AC generation

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Temperature controlled VFD