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Standard frequency inverter - Gozuk

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In this inverter the options (b) and (c) are available but the accuracy is much greater, and the band width is much greater due to the feedback of the position of the rotation of the motor shaft.

These inverters are suitable for most applications where high speed and Torque accuracy of Constant Torque Output is required or where multiple inverters are being used on a machine and accurate speed regulation is demanded.
Changing Out of Some Existing Controls to AC frequency inverters

Care should be taken when changing over some existing controls to frequency inverter and Motors. Some of these controllers can and do produce output power in excess of the motor HP (Horse Power) rating.

Standard DC inverters can produce 150% for short periods of time; Mill Duty Motors and DC inverters can produce 200 to 350% almost indefinitely; and Slip Ring motors and controller are capable of 350% and more, constantly.

These values must be taken into account when sizing one of these applications for conversion to an frequency inverter. Some frequency inverters now claim to be able to produce 200% of output Torque.

But, unless the AC Induction motor is capable of using and producing this output torque, forcing a motor which is not capable of using this feature will result in an excessive amount of heat being generated in the motor and no additional power output will occur.

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Frequency inverters convert alternating current (AC) to direct current (DC), and then convert the DC back to AC at a frequency that will drive the motor at the desired speed. Although this makes the motor run less efficiently, the ability to respond to load variations reduces overall energy use. Without a frequency inverter, the motor can run efficiently at a single speed, but it may be running at a higher speed than needed. Variable voltage input (VVI)鈥攖his is the simplest type of frequency inverter. The output switching devices approximate a sine wave voltage for the motor by producing a series of square waves at different voltages. VVI drives use a large capacitor in the DC link to provide a relatively constant DC voltage to the inverter. Frequency inverter types and designs Three major designs are used, including variable voltage input, current source input and pulse width modulated. Hybrid and customized variation designs are also available.