Simple Motor $—$ Constant displacement motor with leakage

This model describes a motor with constant displacement and losses.

Implementation

See component Id Con Mot. The delivered flow rate at the outlet port of this model may be different because of flow into lumped volumes and external and internal leakage.

Mechanical efficiency

This model includes a component for constant mechanical loss, set by the parameter mechanicalEfficiencyCoefficient.

Assumptions

Constant mechanical loss and displacement.

Connections

 Name Description Modelica ID ${\mathrm{port}}_{A}$ Port A, where oil flows into the component ($0, ${p}_{B}<{p}_{A}$ means $0<\mathrm{Δp}$) port_A ${\mathrm{port}}_{B}$ Port B, where oil leaves the component ($q<0$, ${p}_{B}<{p}_{A}$ means $0<\mathrm{Δp}$) port_B ${\mathrm{flange}}_{a}$ flange_a ${\mathrm{flange}}_{b}$ flange_b $\mathrm{oil}$ oil

Parameters

General Parameters

 Name Default Units Description Modelica ID ${\mathrm{ΔT}}_{\mathrm{system}}$ $0$ $K$ Temperature offset from system temperature dT_system external leakage $\mathrm{true}$ If true, a small amount of oil leaks to the tank components externalLeakage use volume A $\mathrm{true}$ If true, a volume is present at port_A useVolumeA use volume B $\mathrm{true}$ If true, a volume is present at port_B useVolumeB ${G}_{\mathrm{ext}}$ ${10}^{-13}$ $\frac{{m}^{3}}{s\mathrm{Pa}}$ Conductance of external leakage Gext ${G}_{\mathrm{int}}$ $5.·{10}^{-12}$ $\frac{{m}^{3}}{s\mathrm{Pa}}$ Conductance of the internal motor leakage Gint ${\mathrm{D}}_{\mathrm{motor}}$ ${10}^{-4}$ ${m}^{3}$ Displacement per revolution Dmotor $J$ $0.01$ $\mathrm{kg}{m}^{2}$ Moment of inertia J $\mathrm{td}$ $\frac{7}{10}$ Friction coefficient td ${\mathrm{\epsilon }}_{\mathrm{mech}\left(\mathrm{coeff}\right)}$ $1$ Constant for mechanical efficiency mechanicalEfficiencyCoefficient

Oil Parameters

 Name Default Units Description Modelica ID ${V}_{A}$ ${10}^{-6}$ ${m}^{3}$ Geometric volume at port A volumeA ${V}_{B}$ ${10}^{-6}$ ${m}^{3}$ Geometric volume at port B volumeB