EXPERIMENT NO. 2
Aim: To find the effect of varying mass on the centre of sleeve in governor and governor
Apparatus required: Governor set up, Voltage regulator.
➢ Drive D.C. Motor – H.P – ¼, speed = 1500RPM.
➢ Speed control unit: 0 - 230 V,
0 – 2 Amps, Single phase auto transformer,
➢ Separate linkage for watt governor, Porter governor, proell governor,(Governor
➢ Sleeve displacement is to be noted on scale provided,
➢ Speed measurement is done by the Tachometer.
The drive unit consists of a small flange mounted electric. motor connected through
differential pulley system to main shaft. The optional governor mechanism can he mounted on spindle.
Precise speed control is afforded by the speed control unit and an extension to the spindle shall
allows the use of a hand tachometer.To determine the speed, a graduated scale is fixed to the
sleeve and guided in vertical direction. The centre sleeve of the porter and proell governors
incorporates a weight sleeve to which weights may be added. The Hartnell governor provides
means of varying spring rate and initial compression level and mass of rotating weight. This
enables the Hartnell governor, to be operated as a stable or unstable governor. The apparatus is
designed to exhibit the characteristics of the spring leaded governor and dead weight governor.
The apparatus is driven by a D,C. Motor with special variable speed control unit, The apparatus can
perform following experiments Watt .Porter, Proell, Hartnell type governors.
The governor mechanism under rest is fitted with the chosen weights and spring, where
applicable, and inserted into the drive unit. The following simple procedure may then be
The control unit is switched on and the speed control slowly rotated, increasing the governor speed
until the centre sleeve rises off the lower stop and aligns with the first division on the graduated scale.
The sleeve position and speed are then recorded_ Speed may be determined using a hand tachometer
on the spindle, The governor speed is then increased in steps to give suitable sleeve moments, and
readings repeated at each stage throughout the range of sleeve movement possible.
The result may be plotted as curves of speed against sleeve position, Further tests are carried out
changing the s aim of one variable at a time to produce a family of cures.