5 Guidelines for Gear Unit Selection - SEW-EURODRIVE

1 38 Catalog Planetary Gearmotors P002 - 082 Series5 Additional documentationGuidelines for gear unit Selection5 Guidelines for gear unit documentationIn addition to the information in this catalog, SEW-EURODRIVE offers extensive docu-mentation covering the entire topic of electrical drive engineering. This is primarily doc-umentation from the "Drive Engineering Practical Implementation" series. You can or-der the current documentation from SEW-EURODRIVE . The documentation can also bedownloaded in PDF format from the SEW homepage ( ).

2 Drive Engineer-ing Practical ImplementationThe publication "Drive Engineering Practical Implementation Drive Selection withSEW-EURODRIVE Gearmotors" features extensive information on characteristics, dif-ferentiating features and application areas of SEW drives. A comprehensive collectionand assignment of the most important formulae for drive calculation as well as detailedexamples for the most frequently used applications make this documentation an impor-tant tool for project planning and an essential addition to SEW-EURODRIVE Planetary Gearmotors P002 - 082 Series 395 Project planning procedureGuidelines for gear unit planning procedureThe following flow diagram illustrates the project planning procedure for a planetary the drive Selection sheet Calculating the

3 Basic dataSelecting the application factorsCalculating the requiredrated gear unit torqueSelecting the planetary stageChecking external additional forcesChecking the peak load conditionsChecking the thermal ratingM , , , nPi,F ,F ,FMM M MK22K2 SminFStartN2N2K2 maxK2 zul <InquiryStep 1 Step 2 Step 3 Step 4 Step 5 Selecting the motor power rating PMStep 6 Selecting the combination withgearmotor of the "7 Series" / checking M Step 7 Step 8 Step 9 Step 10 Selecting the lubricantStep 11a, exSelecting the accessories Step 12 Technical information for quotation Step 13i40 Catalog Planetary Gearmotors P002 - 082 Series5 Project planning procedureGuidelines for gear unit SelectionStep 1: Drive Selection Machine on LSS (normally the driven machine) Ambient temperature [ C] [.]

4 ] Installation [X]small rooms (v m/s)large rooms and halls (v m/s)outdoors with protection from the sun (v 3 m/s) Ambient conditions [X] Altitude [m] [..] Load Required speed n [1/min] [..] Input power P [kW] [..] Output torque M [kNm] [..] Frequency of peak load (M or P ) [..] Number of starts per hour [..] Rotation direction under load (LSS) [X]clockwise (CW)counter-clockwise (CCW)both Operating period/day [X] 3 hours3 .. 10 hours> 10 Backstop required in gear unit [X]NoYe Exact load cycle attached [X]NoYe Machine on HSS (normally the driving machine) Type: [X]AC motorAC motor/inverterDC motorHydraulic Motor power P [kW] [.

5 ] Motor torque M [kNm] [..] Input speed n [1/min] [..] If electric motor: [X] [..] IECNEMAM otor size (IEC- or NEMA code) Mounting of motor [X] [..] B3B5V1 gear unit gear unit Type [X]Inline K2 K1 max. MM1 Field of application/industry [..] Application [..] Motor speed n [kW] [..] : [..] = fill in values [X] = make your selections by CWCCWC atalog Planetary Gearmotors P002 - 082 Series 415 Project planning procedureGuidelines for gear unit Mounting position [X]M1M2M3 Mounting positions for primary stage RF/KF gearmotors [X]0 90 180 270 Position of motor terminal box and cable entry [X]0 (R)90 (B)180 (L)270 (T)X1230 90 180 270 M4M5M6270 90 180 0 TBX2X31 LRXX0 (R)2X31180 (L)

6 42 Catalog Planetary Gearmotors P002 - 082 Series5 Project planning procedureGuidelines for gear unit Service factor requirements F [X] [..] Required bearing life L [..] FootFlangeTorque LSS connection to customer machine shaft [X] [..]Elastic coupling (claw or pin type)Flexible coupling Rigid flange couplingBarrel couplingChain Mounting of gear unit housing [X] LSS gear unit design [X] [..]LSS design (if solid shaft) Electrical supply [X] [..]On motor power P / motor torque MOn operating power at LSS P / operating torque at LSS M hoursSolid shaft with keyOtherLSS connection (if hollow shaft)Hollow shaft with keywayOtherHollow shaft for shrink disk connection, shrink disk includedPinionHollow shaft - torque armHollow shaft - foot-mountedHollow shaft - flange-mounted OtherLine voltage V3-phase1-phaseACDCVA uxiliary voltage V3-phase1-phaseACDCVHZD egree of protectionIPExplosions protectionrequiredYe sNoHZS min.

7 K2K2h minMM lineauxSolid shaft without keywaySolid shaft with spline DIN 5480 Hollow shaft with spline DIN Machine shaft bearing2 bearings, gear unit only transmits torque1 bearing opposite to gear unit , gear unit acts as bearing support1 bearing next to gear unit , gear unit acts as bearing Loads on LSS [X] [..] load F [N]Radial load F [N]Distance from shaft shoulderX [mm]Application angle of radial load [ ] HSS connection to motor [X]Customer installation (foundation base frame)Motor adapter with elastic couplingSwing base/base frameMotor bracket with V-belt drive Motor scoopOther, see sketch FA-+XFR 0 Catalog Planetary Gearmotors P002 - 082 Series 435 Project planning procedureGuidelines for gear unit Selection5 Step 2.

8 Calculating the basic data MK2, n2, i, Constant torqueMK2 = Required output torque [Nm]PK1 = Required operating power on HSS [kW]n2 = Output speed (LSS) [rpm]Equivalent torque with load spectrum and constantspeed n2 The following figure shows a load example:MK2 = Operating torque on LSS [Nm]= Time slice of the load I, II,..n = Types of loadGear ration1 = Input speed (HSS) rpmn2 = Output speed (LSS) rpmEfficiency = f (i; gear unit type)The efficiency of the gear unit is mainly determined by the gearing and bearing friction as well by churning losses.

9 For the calculation, a reference value of 98% is xn29550xComment: If is not known -> = PK1PK1 P M [Nm] t=IMK2equiv(M )K2 ItII+tn(M )K2II+..(M )K2n tN tN tNIIIIIIIVtItIItIIItIV tNMK2MK2MK2MK2MK2MK2equiIIIIIIIV tNtI Planetary Gearmotors P002 - 082 Series5 Project planning procedureGuidelines for gear unit SelectionStep 3: Selecting the application factorsFS min - Applica-tion-specific service factorThe application-specific service factor Fs considers the typical load behavior with regardto the drive values with reference to field of application type of driven machine operating time/dayare given in the following service factorFS min see page 45 Peak load factorFF see page 47 Startup factorFStart see page 47 STOPT hese tables apply only to gear units driven by electric motors.

10 For other types of drivemotors, the following correction values apply: Combustion engines with four or more cylinders: FS min ( Selection table) + Combustion engines with one to three cylinders: FS min ( Selection table) + the event of deviations from the typical load behavior, please consult Planetary Gearmotors P002 - 082 Series 455 Project planning procedureGuidelines for gear unit Selection5 Field of applicationType of application(Driven machine)Application-specific service factor FS minoperating period / day< 3 h 3-10 h> 10 hWaste water treatmentImpeller and wheel excavators1)1)1)EnergyFrequency wheels (low speed) turbines--1)