Model of stray load losses dependent on current and speed

 Description The Stray Load component models losses dependent of the motor current and shaft speed.
 Equations $\mathrm{\tau }=-{\mathrm{\tau }}_{\mathrm{ref}}{\left(\frac{i}{{I}_{\mathrm{ref}}}\right)}^{2}\left\{\begin{array}{cc}0& {P}_{\mathrm{ref}}<0\\ {\left(\frac{\mathrm{\omega }}{{\mathrm{\omega }}_{\mathrm{ref}}}\right)}^{{p}_{\mathrm{\omega }}}& 0\le \mathrm{\omega }\\ -{\left(-\frac{\mathrm{\omega }}{{\mathrm{\omega }}_{\mathrm{ref}}}\right)}^{{p}_{\mathrm{\omega }}}& \mathrm{otherwise}\end{array}$ $v={v}_{p}-{v}_{n}=0$ $i={i}_{p}=-{i}_{n}$ $\mathrm{\phi }={\mathrm{\phi }}_{\mathrm{flange}}-{\mathrm{\phi }}_{\mathrm{support}}$ $\mathrm{\omega }=\stackrel{.}{\mathrm{\phi }}$ $\mathrm{\tau }={\mathrm{\tau }}_{\mathrm{support}}=-{\mathrm{\tau }}_{\mathrm{flange}}$ ${\mathrm{\tau }}_{\mathrm{ref}}=\frac{{P}_{\mathrm{ref}}}{{\mathrm{\omega }}_{\mathrm{ref}}}$ $\mathrm{lossPower}=-\mathrm{\tau }\mathrm{\omega }$

Variables

 Name Units Description Modelica ID $v$ $V$ Voltage drop between the two pins v $i$ $A$ Current flowing from pin p to pin n i $\mathrm{\phi }$ $\mathrm{rad}$ Angle between shaft and support phi $\mathrm{\tau }$ $Nm$ Torque tau $\mathrm{\omega }$ $\frac{\mathrm{rad}}{s}$ Relative angular velocity of flange and support w $\mathrm{lossPower}$ $W$ Loss power leaving component via heat port lossPower

Connections

 Name Description Modelica ID $p$ Positive pin p $n$ Negative pin n $\mathrm{flange}$ Shaft end flange $\mathrm{support}$ Housing and support support $\mathrm{heatPort}$ heatPort

Parameters

General Parameters

 Name Default Units Description Modelica ID use heat port $\mathrm{false}$ true means heatPort is enabled useHeatPort

Losses Parameters

 Name Default Units Description Modelica ID ${P}_{\mathrm{ref}}$ $0$ $W$ Reference stray load losses when $\left|i\right|={I}_{\mathrm{ref}}$ and $\left|\mathrm{\omega }\right|={\mathrm{\omega }}_{\mathrm{ref}}$ PRef ${I}_{\mathrm{ref}}$ $A$ Reference RMS current IRef ${\mathrm{\omega }}_{\mathrm{ref}}$ $\frac{\mathrm{rad}}{s}$ Reference angular velocity wRef ${p}_{\mathrm{\omega }}$ $1$ $1$ Exponent of stray load loss torque w.r.t. angular velocity power_w

 Modelica Standard Library The component described in this topic is from the Modelica Standard Library. To view the original documentation, which includes author and copyright information, click here.