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Variable Frequency Drive | VFD | Inverter

Operating Conditions:

Drive type DC AC VFD AC VFD AC VFD AC VFD
Control platform Brush type DC V/Hz control Vector control Vector control Vector control
Control criteria Closed-loop Open-loop Open-loop Closed-loop Open-loop w. HFI^
Motor DC IM IM IM Interior PM
Typical speed regulation (%) 0.01 1 0.5 0.01 0.02
Typical speed range at constant torque (%) 0-100 10-100 3-100 0-100 0-100
Min. speed at 100% torque (% of base) Standstill 8% 2% Standstill Standstill (200%)

 

Description

Products Features:

A variable-frequency drive (VFD) or adjustable-frequency drive (AFD), variable-voltage/variable-frequency (VVVF) drive, variable speed drive (VSD), AC drive, microdrive, or inverter drive is a type of motor drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage this variable-frequency drive (VFD) mainly for the SDT gearbox.

DC IM IM IM Interior PM
Typical speed regulation (%) 0.01 1 0.5 0.01 0.02
Typical speed range at constant torque (%) 0-100 10-100 3-100 0-100 0-100
Min. speed at 100% torque (% of base) Standstill 8% 2% Standstill Standstill (200%)
Multiple-motor operation recommended No Yes No No No
Fault protection (Fused only or inherent to drive) Fused only Inherent Inherent Inherent Inherent
Maintenance (Brushes) Low Low Low Low
Feedback device Tachometer or encoder N/A N/A Encoder N/A

 

Application:

Variable-frequency drives (VFD) are used in applications ranging from small appliances to large compressors. About 25% of the world’s electrical energy is consumed by electric motors in industrial applications. Systems using VFDs can be more efficient than those using throttling control of fluid flow, such as in systems with pumps and damper control for fans.