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Brush

Model considering voltage drop of carbon brushes

Modelica Standard Library

	Description
	The Brush component models the voltage drop and losses of carbon brushes. Note: The voltage drop $v$ is the total voltage drop of all series connected brushes. See also the Parameters described below. If it is desired to neglect brush losses, set $V = 0$ (this is the default).

	Equations
	$v = {\begin{array}{c} 0 & V \leq 0 \\ V & I_{linear} < i \\ - V & i < - I_{linear} \\ \frac{V i}{I_{linear}} & otherwise \end{array}$ $v = v_{p} - v_{n}$ $i = i_{p} = - i_{n}$ $lossPower = v i$

Variables

Name	Units	Description	Modelica ID
$i$	$A$	Current flowing from pin p to pin n	i
$v$	$V$	Voltage drop between the two pins	v
$lossPower$	$W$	Loss power leaving component via heat port	lossPower

Connections

Name	Description	Modelica ID
$p$	Positive pin	p
$n$	Negative pin	n
$heatPort$	Conditional heat port	heatPort

Parameters

General Parameters

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

Losses Parameters

Name	Default	Units	Description	Modelica ID
$I_{linear}$	$0.01$	$A$	Current indicating linear voltage region of brush voltage drop	ILinear
$V$	$0$	$V$	Total voltage drop of brushes for currents > ILinear	V

	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.

See Also

DC Machine Losses

Electrical Library

Electrical Machines

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