Renold Clutches & Couplings - casa sueca s.a.

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‘Soft’ Starting 600 Fig. 3 500 Asorbed Current % 400 300 200 100 A B C 300 200 100 Torque % 0 0 20 40 60 80 Input Speed % 100 Effect of starting on electric motors If a machine is driven by a squirrel cage motor without the use of a HydraStart fluid coupling, the following conditions arise (see Fig. 3). 1. Motor will pull out 250/280% FLT. 2. Motor will consume 6 times FL amps. 3. Increase in motor temperature. Star-delta starting reduces overheating. However, the starting torque in star is only 30% that in delta and it is often necessary to use larger or more complicated wound motors, particularly with high inertia machinery. A = Locked rotor torque B = Stall torque 250/280% C = Normal torque 100% I = Amperage 600 500 Fig. 4A 300 Fig. 4B Slip 100% Asorbed Current % 400 300 200 100 Without Coupling Starting Torque % 200 100 Slip 2-6% 0 0 20 40 60 Time % 80 100 0 20 40 60 80 Output Speed % 100 Effect of starting of electric motors when fitted with HydraStart Couplings When a drive includes a HydraStart coupling the motor starts on very low load, with only an instantaneous current peak at switch on (Fig. 4A). At start up all the motor torque is available to accelerate the motor rotor and coupling impeller (pump). The driven impeller (turbine) increases speed smoothly from zero rpm until the 100% slip curve intersects the motor torque curve at approximately 85% motor speed (Fig. 4B). When the torque developed by the HydraStart coupling matches the resisting torque of the driven machine, acceleration of the load commences and continues up to running speed which will be between 94% and 98% of the driving speed depending on the coupling size. RENOLD Clutches and Couplings. Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20793004 E-Mail: couplings@cc.renold.com 52
‘Soft’ Starting 100 Fig. 5 80 100% Slip Engine Torque % 60 60 40 20 0 0 20 40 60 80 100 Input Speed % HydraStart couplings fitted on diesel engines HydraStart fluid couplings can be used with all types of industrial machinery driven by internal combustion engines. Fig. 5 shows typical engine and coupling performance curves. The horizontal curve represents the engine’s torque curve whilst the vertical shows the torque capacity of the coupling for different slip values and speeds. As load on the driven shaft increases it demands torque, causing the coupling to slip at higher level. If still greater loads are demanded then the coupling will eventually slip at 100%. Note this does not happen until the engine has developed peak torque. Thus by using a fluid coupling, it permits an engine to develop maximum torque without stalling under load and promotes rapid acceleration to normal load speed. RENOLD Clutches and Couplings. Tel: + 44 (0) 29 20792737 Fax: + 44 (0) 29 20793004 E-Mail: couplings@cc.renold.com 53
Page 1 and 2: Couplings Resilient and Soft Start
Page 3: Contents Page No Company Profile 5
Page 6 and 7: Flexible and Soft Start Couplings -
Page 8 and 9: Pictorial Contents Spiderflex Coupl
Page 10 and 11: Gears and Variable Speed Product Ra
Page 12 and 13: Selection of Couplings Flexible Cou
Page 14 and 15: Service Factors and Selection Servi
Page 16 and 17: Range of Taper Bushes Metric Range
Page 18 and 19: Spiderflex G H1 H2 H2 Assembled len
Page 20 and 21: Spider F D A B C C Coupling Power T
Page 22 and 23: Pinflex E F D B C1 C2 C2 Type B Typ
Page 24 and 25: Pinflex Brakedrum Couplings G H D B
Page 26 and 27: Crownpin An established pin/buffer
Page 28 and 29: Crownpin (continued) Component Spar
Page 30 and 31: Tyreflex Sizes TY40 to TY60 Sizes T
Page 32 and 33: Tyreflex (continued) Ordering Code
Page 34 and 35: Discflex E E D A B Type B C F C Typ
Page 36 and 37: Chainflex An all metal flexible yet
Page 38 and 39: Rigid C1 E C2 E C2 E D B A D B D B
Page 40 and 41: Gearflex - Introduction Piloted Cro
Page 42 and 43: Gearflex DA L1 L2 F1 NORMAL F2 POSI
Page 44 and 45: Gearflex SA L F B1 A1 C1 C2 A2 B2 D
Page 46 and 47: Gearflex GFV B1 A1 C1 F L C2 A2 B2
Page 48 and 49: Hydrastart Soft Start - Fluid Coupl
Page 50 and 51: Operating Principles OUTER COVERS D
Page 54 and 55: Hydrastart Selection Chart 1000 800
Page 56 and 57: Standard Available Options Non Dela
Page 58 and 59: Hydrastart Pinflex Coupling - Dimen
Page 60 and 61: Hydrastart Gearflex Coupling - Dime
Page 62 and 63: Renold Hi-Tec Couplings Hi-Tec Coup
Page 64 and 65: RB Flexible Coupling General purpos
Page 66 and 67: RB Shaft to Shaft Rigid half / Flex
Page 68 and 69: RB Standard SAE Flywheel to Shaft 0
Page 70 and 71: RB Standard SAE Flywheel to Shaft w
Page 72 and 73: RB Technical Data 1.1 Diesel Engine
Page 74 and 75: RB Technical Data Coupling Nominal
Page 76 and 77: PM Flexible Coupling Heavy duty ste
Page 78 and 79: PM Shaft to Shaft PM 0.4 to PM 130
Page 80 and 81: PM Mill Motor Couplings Mill motor
Page 82 and 83: PM Technical Data 1.1 Prediction of
Page 84 and 85: PM 180 - PM 6000 PM Technical Data
Page 86 and 87: PM Design Variations The PM couplin
Page 88 and 89: Selection Procedure ● From the co
Page 90 and 91: Selection Examples Example 1 Exampl
Page 92 and 93: Rubber Information The rubber block
Page 94 and 95: Product Range The products comprise
Page 97 and 98: Notes RENOLD Hi-Tec Couplings. Tel:
Page 99 and 100: Worldwide Sales and Services NORWAY

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