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Gerotor Pumping Element CAD / CAM Software

Gerotor Design Studio (GDS) is a unique, fully featured CAD/ CAM solution to the difficult task of designing, analysing and manufacturing gerotor pumping elements. These pumping elements are used in many types of fluid transfer and hydraulic power applications across the World as they offer significant benefits over traditional 'spur gear' type pumps (package size, smoother fluid delivery, more efficient, less noise, etc.).

Although the gerotor element has been around for a long time and its benefits are well documented, it is not an easy shape to produce. Hence anyone involved with pump design wishing to use a gerotor set has had to use an 'off the shelf' item from one of the major gerotor manufacturers. Whilst this is an acceptable method of obtaining gerotors, you generally have to design the pump around what is available. The ability to design bespoke gerotor sets (and be able to manufacture them) means you now have complete control over your pump design and manufacture processes.

This software is available as a FREE to use, fully featured (no lockouts), installation. However, there is a 30 day limitation after which a registration key must be purchased in order to continue using the software. The registration key is available either on-line (via secure Credit Card or PayPal payment) or via a traditional order number / invoice route (only for company registrations) for just 495GBP per license. Licenses are available over email as a node-locked (one PC) or via a mailed USB dongle for a small additional charge (enables movement of the license from PC to PC). Network (floating) licenses are also available for multiple client / multiple license solutions. A 200GBP / year maintenance license is chargeable annually after expiration of the initial license.
Full license terms and conditions are available to view here.

Click to see a list of Revisions and Fixes which have been applied (part of our ongoing improvement commitment). GDS will automatically update your software to the latest version (providing you have an internet connection).

 

 

 

 

 

 

Design

Gerotor profiles can be designed by specifying all the necessary parameters (if known), or GDS will create a design for you by specifying a few key parameters. This is especially useful for reverse engineering a Gerotor set to fit an existing housing.

The porting can also be designed from within GDS. Again this can be specified implicitly by the user or it can be designed automatically by GDS. Features such as 'double sided' (for improved filling / exhaust) or 'Shadow porting' (for rotor balance within the housing) can also be specified. A 'metering groove' can also be added which can assist with noise attenuation due to pressure ripple effects.

The Gerotor & porting profiles are shown in the 'Design View' Window and can be magnified to see them in more detail; the gerotors can also be rotated to examine how they mesh and interact with the port cavities.

All of these features can later be created as Solid Models or CNC files for manufacture.

 

 

 

 

 

 

 

Performance

The performance of the pump can be simulated to give basic performance criteria such as flow, power consumption, volumetric and mechanical efficiency and contact stress between the lobes.
Other performance criteria are also calculated, such as pressure ripple, drive shaft side loads & direction, speed at which cavitation begins and the maximum tool diameter able to cut the inner rotor.

Performance criteria can be graphed, either within GDS or exported directly to Microsoft Excel. The raw data is also available as text files for export to other analysis software.

Future developments will allow the gerotor performance to be calculated in various CAD / simulation packages for increased accuracy and detail.

 

 

 

 

 

 

 

CAD Modelling

Gerotor and porting designs can be exported directly to the following CAD packages;

  • SOLIDWORKS
  • SolidEdge
  • AutoCAD
  • AtoDesk Inventor
  • Catia V5
  • Creo Elements Direct Modelling & Creo Parametric - COMING SOON..

In addition, DXF (2D only) and (very soon!) STEP files (3D) of the rotors and porting can also be produced directly from within GDS. This allows interaction with other, non directly supported, CAD/CAM packages.

 

 

Gerotor Design Studio are proud to be involved in the following partner programs:

 

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Manufacture

GDS can produce CNC ready files for inclusion in an existing CNC program. These can be in X-Y Co-ordinate format, or G-Code format.

 

 

 

 

 

 

 

Licensing / Trial Period

GDS is available as a 30-day UNLIMITED USE, FULL FUNCTIONAL trial by following the 'Free Trial' link at the top or bottom of the page. The software is Windows based and will run on Windows XP upwards. It will install as a 32-bit program.

After the 30-day trial period it is possible to unlock the software for 1 year by purchase of the Initial License. This license costs 495GBP (VAT is charged if applicable) and is obtained by following the instructions on the 'Licensing' link at the top or bottom of this page. Any remaining 'free trial' license days will be added to the 1 year license (so there is no need to wait until the free trial has almost expired prior to purchasing the license.

After the first year, the annual maintenance license agreement will apply. Currently this is 200GBP and allows continued use of the software, including free updates and upgrades if applicable.

 

 

 

 

 

 

Revisions and Fixes

Software Level
Details
Date
2.0.7
Initial Release of V2.0
17/06/2011
2.0.8
Error trap introduced for update checking routine
30/06/2011
2.0.9

Corrections made to prevent confusion with comma (,) as decimal separator (i.e. in some European locales). All inputs changed to (.) decimal separator automatically to prevent errors with internal calculations.

Output text file format changed from .csv to .txt to prevent formatting confusion with European locales using comma (,) as decimal separator

18/07/2011
2.0.10

Improved inner rotor profile error checking method

Improved Solid Edge modelling technique to prevent errors during creation of inner rotor

10/08/2011
2.0.11
Prevention of 'loop' error with port radius if rotor parameters changed after porting design completed
11/08/2011
2.0.12
Included 'Flow vs Pressure' text file within the Performance Data Files output
24/10/2011
2.0.13
Further improvements to Solid Edge models for inner and outer rotors
26/10/2011
2.0.14
Correct port radius error (as version 2.0.11) for imperial units
03/01/2012
2.0.15

Decimal separator corrections for DXF and CNC output files

21/02/2012
2.0.16

Revised axial leakage calculations - much more accurate predictions especially for higher pressures and smaller gerotor sets.

Fixed bug with the 'Flow' graph where Y axis values would not show correctly when using a small gerotor set.

22/02/2012
2.0.17
Added Maximum and Minimum Chamber Volume to calculations
15/07/2012
2.0.18
Improved accuracy for Max and Min Chamber Volumes. Improved rotor profiling (especially with large lobe numbers)
18/08/2012
2.0.19
Added ability to change port radii (customer request)
01/08/2013
2.0.20
Corrected error with Inventor models (not displaying outer rotor correctly)
23/10/2013
2.0.21
Corrected error with Inventor models in inches units
01/12/2013
2.0.22
Offset of inner rotor error corrected
14/12/2013
2.0.23
Increased resolution for fillet radii of outer rotor (produced CAD model error in Catia V5)
11/06/2014
2.0.24
Corrected error where SolidWorks outer rotor model would not display if over 215mm diameter
20.02/2015
2.0.25
Corrected Volumetric Efficiency calculations when using port radii other than default values
03/04/2015
2.0.26
Corrected error with Flow & Pressure output text file
22/04/2015
2.0.27
Corrected error generating some Outer rotor models in Inventor
23/10/2015
2.0.28
New Feature! Export Performance Data direct to Microsoft Excel (including charts)
19/11/2015
2.0.29
New Feature! Allow manual changes to the root radius of the outer rotor (customer request).
Small change to improve accuracy of tip clearance on manufactured parts.
19/02/2016
2.0.30
Improved accuracy of drive torque / power calculations.

Improved error trapping for port design function.

Corrected error with versions of Microsoft Excel 2013 onwards - multiple performance criteria now display correctly in one Excel worksheet.

Improved charting functionality within GDS - easier to move; charts can be closed once created

29/03/2016

VERSION 2.1    
2.1.2
Removed 'Drawing Resolution' feature (carryover feature from V1. Useful on slow PCs, not an issue with later machines. Redundant feature).Licensing model updated (more secure). Trial version increased to 30 days (was 10 uses).
03/07/2016
2.1.3
License Agreement added.
10/07/2016
2.1.4
STEP file generation feature - Generate STEP (.stp) files direct from GDS for import into non supported CAD platforms. Inner Rotor; Outer Rotor; Rotor Assembly & Porting are all available in STEP format.
15/01/2017
2.1.5

Minor bug fixes to eliminate error messages under specific conditions (porting, pressure ripple graph generation, eccentricity = 0 error message with 'Design Rotors').

Further improvements to the 'Design Rotors' routine, to reduce additonal user input.

Ability to save the Gerotor Parameter Explanation and Port Parameter Explanation screens as part of the screen layout (so always visible).

11/03/2017
2.1.6

Decimal point seperator in Step files constrained to always be a 'dot' even with Windows configured to use a 'comma' (Step file format requires 'dot').

Text used on GDS forms changed to Arial instead of Sans Serif, to fix a graphical error on some Windows systems.

In program chart errors fixed: unreadable values on Power chart Y axes with small gerotors; minimisation of charts caused GDS to crash.

Error fixed with View Window which caused GDS to crash if it was re-sized too quickly.

Ability to save screen layout allows main program screen size to be user defined (not only maximum screen size).

11/05/2017
2.1.7
Minor profile error (under certain conditions) on inner rotor fixed (slight reversal of profile at transition of lobe to inner root radius). Error prevented correct modelling of inner rotor.
16/05/2017
2.1.8

Further improvements to rotor profile generation.

Improvements to Contact Stress model and accuracy of results.

Resolved issue with SOLIDWORKS inner rotor profile on small gerotors (sawtooth profile error).

Addition of GT-SUITE launch button - provides information for forthcoming feature release (does not yet launch GT-SUITE).

31/08/2017

 

 

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