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Advantages of Vector VFD

Vector VFDs provide all the benefits and advantages of VVVF VFDs and more.

Start with all the advantages of VVVF VFDs:
  • Use "standard", low-cost, induction motors. Explosion-proof motors and other special construction is widely available. Brushes, commu­tators, or special "permanent-magnet' rotors are not required.
  • High-input displacement power factor (about 95%), for lower-cost power.
  • Some inherent ability to "hold back" loads through regeneration with­out extra hardware.
  • High-speed capability (6,000 RPM is easily attainable).
Add to those the following advantages not achievable with standard VVVF VFDs:
  • Closed-loop speed regulation to 0.01%.
  • High-dynamic response of greater than 50 radians/second.
  • Smooth low-speed operation, even under changing loads.
  • High breakaway torque (150% or even 200% is common).
  • Linear torque control for positioning or tension.
These advantages make vector VFDs the best answer for many applications.

Compared with DC drives, a vector VFD's high power factor, high-speed capability, and the ability to use induction motors are important advantages. Unlike brushless VFDs, which have been sold as replacements for DC drives, vector VFDs do not need specially-designed motors with permanent­ magnet rotors.

Vector VFD compare with other speed regulators
The figure shows some comparisons among vector VFDs and other technolo­gies. This data may vary somewhat by manufacturer, but nonetheless pro­vides general guidelines.

Pricing for AC vector VFDs is competitive with DC VFDs in applications below 50 HP. Vector VFDs are often more expensive than DC drives in larg­er ratings, primarily due to the more expensive power semi-conductors found in AC VFD. The lower cost of AC motors offsets some of this difference, though. Application considerations may also justify a premium for vector VFDs in those cases where the initial cost is higher.

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