TORQUE LIMITERS

More documents

Recommendations

Info

SELECTION According to disengagement torque As a rule, torque limiters are rated according to the required disengagement torque, which must be greater than the necessary operating torque. The disengagement torque is determined according to the drive specifications. The following formula provides a basis for calculation: T AR K · T max (Nm) K = 1,3 uniform load K = 1,5 light, non-uniform load K = 1,8 sheavy, non-uniform load or P Drive T Drive 9550 · –––— n (Nm) T AR = Disengagement torque of coupling (Nm) K = service factor T max = peak operating torque (Nm) T Drive = Nominal torque of drive (Nm) P Drive = Drive power (kW) n = Drive speed (min -1 ) According to acceleration torque (start-up at no load) S A = Shock or load factor J S A = 1 (uniform load) T AR · J L ––––– L · T AS · S A (Nm) J S A = 2 (non-uniform load) A + J L S A = 3 (highly dynamic load) According to acceleration and load torque (start-up with load) J T AR · J L + T AN ––––– L · (T AS - T AN ) + T AN · S A (Nm) J A + J L T AR = Disengagement torque of coupling (Nm) α = Angular acceleration t = Acceleration time (sec.) ω = Angular velocity (1/s) n = Drive speed (min -1 ) J L = Moment of inertia on load side (kgm 2 ) J A = Moment of inertia on drive side (kgm 2 ) T AS = Peak torque of motor (Nm) T AR = Disengagement torque of coupling (Nm) α = Angular acceleration S A = Shock or load factor S A = 1 (uniform load) S A = 2 (non-uniform load) S A = 3 (highly dynamic load) t = Acceleration time (s) ω = Angular velocity (1/s) n = Drive speed (min -1 ) J L = Moment of inertia on load side (kgm 2 ) T AN = Load torque (Nm) J A = Moment of inertia on drive side (kgm 2 ) T AS = Peak torque of motor (Nm) According to number of torque modules T AR = S · F · r T AR = Disengagement torque of coupling (Nm) S = Number of torque modules F = Tangential force (kN) r = Length of lever (m) 0,11 m Length of lever Motor shaft 16 R+W www.rwcouplings.com
SELECTION According to linear feed force Spindle drive Timing belt drive T AN = Load torque (Nm) S = Pitch (mm) F V = Linear feed force (N) η = Efficiency factor T AN = Load torque (Nm) d 0 = Gear diameter (timing belt pulley) (mm) F V = Linear feed force (N) According to resonant frequency The resonant frequency of the coupling must be higher or lower than the frequency of the machine. The following calculation is used for a 2 mass system: Machine Machine C T = Torsional stiffness of coupling (Nm/rad) J Masch. = Moment of inertia total machine (kgm 2 ) (Spindle + carriage + components + coupling half) J Mot. = Moment of inertia motor (kgm 2 ) (Rotor + coupling half) f e = Resonant frequency of 2 mass system (Hz) Specifications of elastomer jaw coupling ST2 Series ST2 / 10 ST2 / 25 ST2 / 60 ST2 / 160 T KN Rated torque (Nm) 10,000 15,000 40,000 80,000 T Kmax Peak torque (Nm) 22,000 33,000 88,000 176,000 Dynamic torsional stiffness (10 3 Nm/rad) 145 230 580 1000 Relative damping 1 1 1 1 Rating factors Shock or load factor S A Drive Electric motors, turbines, hydraulic motors Internal combustion engines ≥ 4 cylinders Degree of uniformity ≥ 1:100 G = Uniform load, M = Average load, S = Heavy load Load variables of machine G M S 1.25 1.6 2.0 1.5 2.2 2.5 Temperature factor S υ Ambient temperature -40 C° +30 C° +40 C° +60 C° +80 C° > +80 C° S t 1.0 1.1 1.4 1.8 upon request Start factor S z Start frequency per hour 30 60 120 240 >240 S Z 1.0 1.1 1.2 1.3 upon request www.rwcouplings.com R+W 17
Page 1 and 2: COMPACT AND BACKLASH FREE. single-p
Page 3 and 4: single-position multi-position load
Page 13 and 14: MODEL SK3 BACKLASH FREE TORQUE LIMI
Page 19 and 20: MODEL ATEX FOR USE IN HAZARDOUS ARE
Page 29 and 30: FACTORS AND SIZING CALCULATIONS BAC
Page 33 and 34: ROBUST AND COMPACT Full disengageme
Page 35 and 36: Full disengagement MODELS FEATURES
Page 37 and 38: Full disengagement MODEL STN TORQUE
Page 39 and 40: Designs for Direct Drives with inte
Page 41 and 42: MODEL ST 2 The elastomer segments T
Page 43 and 44: MODEL ST 4 Function of the gear cou
Page 45 and 46: MODEL ATEX FOR USE IN EXPLOSIVE ATM
Page 47: MODEL ST Ordering example Model Ser
Page 51 and 52: SELECTION Specifications of gear co

TORQUE LIMITERS

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?