VFDs – The torsional analyst’s best friend or worst enemy? Part 4

Mark A. Corbo

July 04, 2022

This paper was first presented at the Gas Machinery Research Council 2021 Gas Machinery Conference in Louisville, Kentucky in October 2021. Because of the original length of the paper, it has been divided into four parts. The final segment is published here.

The third primary control type is Direct Torque Control (DTC), which is also a closed loop control system. This is a type of control known as hysteresis or “bang-bang” control. In hysteresis control, a narrow band is placed around the desired value of the regulated variable.

Figure 1 – Sample…
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