IdealPlanetary
Ideal planetary gear box
Library
Modelica/Mechanics/Rotational/Components
Description
The IdealPlanetary gear box is an ideal gear without inertia,elasticity, damping or backlash consistingof an inner sun wheel, an outer ring wheel and aplanet wheel located between sun and ring wheel. The bearingof the planet wheel shaft is fixed in the planet carrier.The component can be connected to other elements at thesun, ring and/or carrier flanges. It is not possible to connectto the planet wheel. If inertia shall not be neglected,the sun, ring and carrier inertias can be easily added by attachinginertias (= model Inertia) to the corresponding connectors.The inertias of the planet wheels are always neglected.
The icon of the planetary gear signals that the sun and carrierflanges are on the left side and the ring flange is on the right sideof the gear box. However, this component is generic and is validindependently how the flanges are actually placed (e.g., sun wheelmay be placed on the right side instead on the left side in reality).
The ideal planetary gearbox is uniquely defined by the ratioof the number of ring teeth zr with respect to the number ofsun teeth zs. For example, if there are 100 ring teeth and50 sun teeth then ratio = zr/zs = 2. The number of planet teethzp has to fulfill the following relationship:
zp := (zr - zs) / 2
Therefore, in the above example zp = 25 is required.
According to the overall convention, the positive direction of allvectors, especially the absolute angular velocities and cut-torquesin the flanges, are along the axis vector displayed in the icon.
Parameters
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo_ratio | ratio | Number of ring_teeth/sun_teeth (e.g., ratio=100/50) | Scalar |
| Name | Label | Description | Data Type | Valid Values |
|---|---|---|---|---|
mo__nmodifiers | Number of Modifiers | Specifies the number of modifiers | Number | |
mo__modifiers | Modifiers | Add new modifier | Structure | |
mo__modifiers/varname | Variable name | Cell of strings | ||
mo__modifiers/attribute | Attribute | Cell of strings | 'start' | |
mo__modifiers/value | Value |
Ports
| Name | Type | Description | IO Type | Number |
|---|---|---|---|---|
sun | implicit | Flange of sun shaft | input | 1 |
carrier | implicit | Flange of carrier shaft | input | 2 |
ring | implicit | Flange of ring shaft | output | 1 |