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Variable-frequency drive facts for kids

Kids Encyclopedia Facts
Small variable-frequency drive
Variable-frequency drive

A variable-frequency drive (VFD) is a device used to control the speed and torque of an AC motor by changing the motor input frequency and voltage.

Applications

VFDs are used for many things that range from small appliances to large mining motors and compressors.

Images for kids

  • HitachiJ100A

    Chassis of above VFD (cover removed)

  • Variable-frequency Drive System

    VFD system

  • Pwm

    Fig. 1: SPWM carrier-sine input & 2-level PWM output

  • Four quadrant motion control of a motor

    Electric motor speed-torque chart

  • VVVF on Guangzhou metro

    VVVF used on train of Guangzhou metro

  • VSI Topology

    Topology of VSI drive

  • 6SWS

    Six-step drive waveforms

  • KIMO TRA U2 mL Gruppe

    Line regenerative variable frequency drives, showing capacitors (top cylinders) and inductors attached, which filter the regenerated power.

  • 2LI Topology

    Simplified 2-Level Inverter Topology

  • 3LI Topology

    Simplified Neutral Point Clamped 3-Level Inverter Topology

  • CHBI Topology

    Simplified Cascaded H-bridge Inverter Topology

  • FCI Topology

    Simplified Flying Capacitor Inverter 4-Level Topology

  • NPC-HBI Topology

    Simplified Neutral Point Clamped H-bridge Inverter Topology

See also

Kids robot.svg In Spanish: Variador de frecuencia para niños

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Variable-frequency drive Facts for Kids. Kiddle Encyclopedia.