TRUE Planetary Gearheads Catalog - Thomson - #10

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10 www.danahermotion.com tn = time period n nnm = mean speed during time period tn Tn..................................................................n Mean input speed (nm) (2) nm = n1mt1 + n2mt2 + n3mt3 + ...... + nnmtn tt where tt = t1 + t2 + t3 + ...... + tn Equivalent torque (TEQ) (3) T.... = ...... T1 ...... n1mt1 + T2 ...... n2mt2+ T3 ...... n3mt3+...+ Tn ...... nnmtn nmtt nmtt nmtt nmtt Modified equivalent torque (TEQm) (4) T...... = (T.......... ...................... ............................................................................................................................ Gearhead Selection Step 1: ................................................................................ gearhead configuration (in-line or right angle). Step 2: Select the proper gearhead using exact or general method. ............................................................................................................................ Engineering. Exact Method General Method Calculate the Mean input ................m.......................................... .............. Select next largest Gearhead .......................................................... exceeded during your application? Is Tr of Gearhead sufficient? NO NO YES NO YES NO General Method: Required Gearhead Torque(Tr) (1) Tr = TM * x i x e where: TM* =...................................................... i = Gearhead ratio e = efficiency of Gearhead * Since many motors are capable of exceeding their ...................................................................................................................... value for TM will only provide a starting point for Gearhead selection. Only use the general method if the continuous motor rating is not exceeded in the application. Exact Method Motion Profile Q # of cycles/hr .......... ........................ .......... ........................ ........ ........................ .......... ........................ T1 T2 T3 n2m n1m n3m t1 t2 t3 YES YES .................................................. ....................................m for Specified Speed .................................................. .................................... .............................................. ....................................r.... ........................................................ Calculate the Modified ........................................................ 4) .................................................... nm = Motor Speed at Rated ............ Compare T.... to Tr of ................................................ (Table 1) at Speed nm Compare Tr to Gearhead ...................................................... Speed nm Select next largest Gearhead Calculate Mean Gearhead Output Speed nmout = nm / i where i = ratio Compare Radial and Axial Loads to Gearhead Values (Table 2) Are Radial and Axial Loads of Gearheads Sufficient? ORDER YOUR MICRON GEARHEAD Select next largest Gearhead