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How can I select the suitable servo for my application?
Created by: Mahmoud Gad at: 5/9/2012 1:27 PM (4 Replies)
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| 5/9/2012 5:33 PM | |
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Posts: 767 Rating:
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Hello Mahmoud Gad, Your nameplate example 1FK7083-5AF71-1TA0 can be used as guide for this motor and others on this subject. Later I will attach pertinent catalog and pages from configuration manual which has more technical data than the nameplate. Also drawing of the above motor. Shaft Height of above motor is 80, which Siemens uses as a rough approximation of the distance from bottom of motor to center line of output shaft.For Shaft Height 80 motors distance per the drawing is 77.5 mm (i.e. 155 mm divided by 2 = 77.5 mm) Above part number can be broken down into digits as follows: 1FK7 - 1FK7 servo motor product line 083 - shaft height and length specification 5 - Compact Motors of the 1FK7 servo motor A - self cooled F -rated speed of 3000 rpm 711 - no specific definition for the 1FK7 servo motors T - feedback is 2 pole resolver A - Shaft extension - Fitted Key and keyway; Without holding brake 0 - Degree of protection IP64 Per the attachedtorque - speed characteristic curves in reference to nameplate following is key data which defines torque- speed characteristics of motor. Nameplates use provide data from the Continuous Duty (S1) torque speed characteristic. Mo - Static Torquecontinuous (at zero rpm)at delta Temp = 100 degrees Kelvin -> 16.0 Nm Io -Static Current continuous (at zero rpm)at delta Temp = 100 degrees Kelvin -> 10.4 Amps Mn - Rated Torque continuous (at rated speed) at delta Temp = 100 degrees Kelvin -> 10.5 Nm In - Rated Current continous (at rated speed) at delta Temp = 100 degrees Kelvin -> 7.4 Amps Nmax - maximum permissible mechanical speed -> 6000 rpm Nn - rated speed - 3000 rpm Drive needs to be selected that will be able to supply the amount of current needed for the application. If little is known about application then general rule is to select servo drive which can supply at a minimum the static continuous current continuously -> 10.4 Amps Servo motors have a torque constantKtwhich means estimate that for motor to provide torque it takes a defined amount of current in a linear formula. Torque constant for this motor is 1.52 Nm/Amp. Since servo drives are rated according to thier output current this value helps select proper current rating for drive. Servo motors are often used in either continuous speed and torque operation or intermittent duty (such as point to point positioning withfrequent starts and stops or changes in speed /torque). The torque / speed curves show higher levels of torque above the Continuous duty (S1) characteristic which are available for short time periods. If application for motor requires operation above the S1 curve then the root mean square (rms) duty cycle of application must result in an effictive rms torque below S1 curve at an average speed in rpm. If application requires a changing speed / torque then that is referred to as a duty cycle. The drive must be selected to be able to supply the torque needed during peakloadsas well as theroot mean square of torque / speed. Attachmentservo motor.PDF (983 Downloads) |
Last edited by: Deputy at: 5/9/2012 7:00 PMAttached now are pages for reference from catalogs, configuration manual, and pdf of drawings. Siemens offers a sizing software (SIZER for Siemens Drives [Version 3.7 is current version]) which is available via download on service and support website which can assist in determining size of motor and drive system needed according to mechanical system. In addition there are a few books available for purchase via internet such as the following: "A Comprehensible Guide to Servo Motor Sizing" Author Wilfried Voss. Deputy |
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| 5/9/2012 7:12 PM | |
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Posts: 767 Rating:
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Hello Mahmoud Gad, Following is link to SIZER for Siemens Drives download via Extranet: https://support.automation.siemens.com/WW/llisapi.dll?func=cslib.csinfo&objId=54992004&nodeid0=10804987&load=content&lang=en&extranet=standard&viewreg=WW&u=NDAwMDAxNwAA&siteID=cseus Also, CAD Creator website is available via any World Wide Web location for downloading via email or preview by pdf format the drawings for Siemens servo motors such as 1FK7. http://staging04.it-motive.de/CADCreator/VorNavigation.cfm?IdListVornavi=(0-4*910)&CFID=4412387&CFTOKEN=22532204&Scenario= www.siemens.de/Cad-creator Deputy |
| 5/10/2012 4:04 PM | |
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Posts: 35 Rating:
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Dear Deputy, Thank you for the effort that you put on answering my question it was very helpful. Regards, M.G. |
Last edited by: Mahmoud Gad at: 5/29/2012 3:35 PM |
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