Motor Force vs Current 
Motor Force vs Current
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Before the drive inverter can be selected, the motor force requirements must be converted to inverter current requirements. The Motor Force vs Current chart below illustrates the force-to-current conversion model.
Note: For an asynchronous induction motor, or a permanent magnet motor operating in field weakening mode, the chart provides the option to display either the stator phase current, IPh, or the torque producing current, Iq. When no option is provided, the torque producing current, Iq, is displayed.
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The motor force vs current calculation is a non-linear exponential overload model, and makes adjustments for speed dependent losses and motor temperature, among other factors. Specify the motor speed in the speed input field above the
chart, and the force-to-current model is updated for the given
speed. |
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Linear assumption based on the motor force constant,
kiFN. This is shown for reference, and to
illustrate the considerable error made when assuming ki
is linear throughout the entire motor force range. |
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Illustrates the available motor force given the inverter peak current rating |
