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The Elevator Drive units are of substantial construction combining rigidity with compactness in uni-cast casing made from close grained cast iron. |
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The Gear box unit is of worm gear type which gives, large speed reduction in smaller space, also it’s operation is quiet. The Input and Output shafts are arranged at right angle. |
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The centrifugally cast phosphor bronze worm wheel and case hardened, thread ground high alloy steel worm are combined with the minimum back-lash to cater for passenger lifts. The output shaft is manufactured from high tensile alloy steel to transmit large torque. |
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The self-locking phenomenon of the worm gears at desired ratio ensures absolute safety of the lift unit. |
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The unit consists of TEFC, S4 duty induction motor with cage rotor to ensure high starting torque, low starting current and smooth acceleration characteristics, essentially required in lift duty application. These flange mounted motors are meant for intermittent periodic duty with starting and ensure silent running and long operating life. TEFC type of enclosure enhances ventilation and considerably reduces heat generation. |
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The Output Shaft is supported in sleeve bearings on both sides. In addition taper roller bearings are used to take thrust loads. Thus giving more rigid construction to take large loads as compared to cantilever type of output shaft arrangement |
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Thruster Electro-magnetic brakes are used for effective braking. The braking effect through two coil springs may be manually released for emergency hoisting under power failure. |
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The drive pulley is in two separate parts having removable sheave bolted with fixed hub. |
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The total unit has common base, hence no separate box frame is required, due to this misalignment problems are eliminated |
