Variable Displacement Motor
Variable displacement motor/pump with mechanical and volumetric efficiency maps
Data Source Option
The Variable Displacement Motor and Variable Displacement Pump are identical devices that can be used as either a motor or pump.
The mechanical and volumetric efficiency of the motor can be set to a constant or computed based on its dependencies. When the variation is constant the ηmech and ηvol given by the user are used in calculations. When specifying the variation as a function of pressure difference and displacement or as a function of speed and pressure difference, any one of the below mentioned Data source options can be selected:
Data Source: This parameter allows users to specify the nature of the source file table. The available options are file, attachment, and inline.
file: Use this option to specify a source file (an Excel or a CSV file) located on the hard drive. Use the ηmech and ηvol parameter dropdown menus to browse and/or select a data file. The data file will not be attached to the MapleSim model.
attachment: Use this option to specify a data file (an Excel or a CSV file) that is attached to the MapleSim model. To be used as an attachment, data files must be attached to the MapleSim model and be categorized under Data Sets. The attached files in a MapleSim model can be viewed In the Attachments pane under the Data Sets section. For more information, see Attaching a File to a Model. If the required file is not already attached to the MapleSim model, use the ηmech and ηvol parameter dropdown menus to attach a new file.
If the file option is used, subsequent changes to the source file will be reflected in MapleSim simulations
If the attachment option is used, subsequent changes to the source file will not affect the version attached to the MapleSim model. To ensure updates to the source files are reflected in the simulation, the file must be reattached.
The Data Generation App can be used to generate table data from mathematical functions using Maple code. For more information about MapleSim apps, see Opening MapleSim Apps and Templates.
inline: Use this option to directly specify the ηmech and ηvol values as a function of the quantities listed in the Variation dropdown menu. The data is entered in the form of a table.
Note: To change the dimensions of the table, right-click (Control-click for Mac®) the parameter field and select Edit Matrix Dimensions. In the Matrix Dimensions dialog, enter values for the number or rows and columns and then click OK.
The data specified by the options mentioned above must conform to the following formatting:
In an m×n matrix A, the elements 2 through m of the first column contain the values of the first quantity listed in the Variation dropdown menu.
In an m×nn matrix A, the elements 2 through n of the first row contain the values of the second quantity listed in the Variation dropdown menu.
The values of the dependent quantity (ηmech, ηvol) are specified in the remaining elements of the matrix. The entry Aij corresponds to the value of ηmech, ηvol for the i-th value of the first quantity listed in the Variation dropdown menu and the j-th value of the second quantity listed in the Variation dropdown menu.
Skip rows: This option allows users to specify the number of top rows to be ignored during the calculations. This option can be useful when the Excel file contains header information.
Smooth: The smooth option allows to specify how the data table is interpolated.
Pressure difference unit: This option allows users to select the unit of pressure used in the supplied data.
Disp unit: This option allows users to select the unit of displacement used in the supplied data.
Upstream hydraulic port
Downstream hydraulic port
Optional real input; commanded displacement per revolution
Right flange of compliant 1-dim. rotational component
Data Units Parameters
Pressure difference unit
Unit for pressure data
Angular velocity unit
Unit for angular velocity data
Unit for displacement data
Use variable displacement
True means enable disp input
Constant displacement per revolution
Maximum displacement per revolution
Disp. input unit
Mechanical Efficiency Parameters
Constant mechanical efficiency. Use values between 0 and 1.
[0,0.5,1; 0.5,0.9,0.9; 1,0.9,0.9]
Smoothness of table interpolation
Motor/Pump Switching Parameters
Pressure difference threshold
Motor/Pump switching threshold
Angular velocity threshold
Motor/Pump switching time constant
Volumetric Efficiency Parameters
Attached Data Set
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