Used Variable Speed Geared Motor 0.75hp By Taj Enterprises -...

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Product Description

Used Variable speed geared motor
MAKE : Brottby Mekaniska Verkstads AB
Made in Sweden
Model : RPF-2S
Input Motor Capacity : 0.55 kw
Input rpm : 2800 r/min
Output shaft rpm - 0-120 r/min
allowed NM : 40 N.M
Weight : 30 kg

Operation

Enormly robust – reliable in service
Speed down to zero
Built-in planetary gearing
Full torque down to zero
Accurate regulation of the speed

The power transmission from the electric motor to the output shaft of the variator is made by rollers which are hardened and ground. The rollers which are running in an oil-bath transmit power from a toroidal driving disk to a driven disc. The pressure between rollers and discs is adjusted by a clutch. The pressure is proportional to the load applied on the output shaft of the variator. When using high-speed variators max. motor power can therefore be transmitted at all speeds. Speed ratio 6:1.

When using the low-speed variators, where the variator unit has a built-in planetary gearing, a constant torque can be transmitted through the whole speed range.

The planetary gearing produces low output speeds and large variation. The internal gear is journalled in the variator housing and it is driven by the radiator. The sun gear is driven by the motor at a constant speed. Through variation of the speed of the internal gear the speed of the output shaft is also varied. When the peripheral speed of the internal gear and that of the sun gear corresponds, the speed of the output shaft is zero.

The major part of the motor power is transmitted directly through the sun gear. In this way good efficiency and small dimensions are achieved. The efficiency is calculated as 85–90 %.

The speed can be regulated accurately by a dial.

The output speed on the variator model RPF is infinitely variable between zero and the maximum speed. For each model a max. torque is stated which normally must not be exceeded, in order to save the variator from abnormally heavy wear.

The relationship between speed, torque and power is given by the equation
Mv = 9555 x Ne/n

where

n = speed, rpm
Ne = power, kW
Mv = torque, Nm

Ex. RPF-4, 0–110 rpm and 1,5 kW can transmit a max. torque of 200 Nm. Full motor power can be transmitted between a speed of

9555 x 1,5/9,81 x 20 = 73 rpm and the top speed.

Within the range of 0–73 rpm the electric motor is stronger than the variator. The transmitted power is following a linear curve from 1,5 kW at 73 rpm to 0 kW at 0 rpm.