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Low voltage motor inverter

12/08/2016

Variable Frequency Drives (VFDs) are among the most useful devices in the industrial world. They allow the speed of a 3-phase AC electric motor to be altered whenever the behavior of the motor’s load change. By changing its output frequency and voltage, the VFD allows the motor to modify its RPMs to respond to those demands.

The Variable speed drives Triol AT24 family is successfully operating in a wide range of areas: fuel and energy sector, housing and utilities infrastructure, mining industry, construc¬tion industry, cement production and metallurgy. Triol AT24 VFD offers a broad range of control modes, features, options, and packaging, as well as global voltages and many power ratings:

What are the key points of selecting the VFD?

Rated current:

Starting current, accelerating current, constant speed current, decelerating current, etc. The maximum current that maybe appear will be the key basis.

Capacity:

As the motor drive power supply, VFD needs to have a high capacity. In consideration of economy, it is not suitable to overestimate the rated capacity, but proper margin is necessary, usually it is greater than the motor rated capacity.

Control strategy:

SPWM, SVPWM, VC, DTC, etc.

Overload capacity:

Overload capacity is the capacity that VFD can exceed the rated continuous output current over a period.

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