THEORY OF MACHINES Page 1 of 2
TM127
Governors
Shows how different governors work, including Hartnell, Porter and Proell governors
Includes three different governors (one shown already fitted)
Demonstrat Demonstrates es the effects of speed, speed, mass, mass, geometry and other other variables variables of governor governor characteristi characteristics cs • Includes Includes three easily-t easily-to-fit o-fit governo governors: rs: Hartnell, Hartnell, Porter Porter and Proell • Portable Portable and suitable suitable for for classroom classroom demonstra demonstrations tions and and use by small small groups of of students students • Fitted with fully interlocked interlocked transparen transparentt safety safety cover cover • Includes Includes steel balls balls to to change change the mass of of the Porter Porter and Proell Proell governor governor sleeves sleeves • Adjustable Adjustable spring spring rate and and compress compression ion of the Hartnell Hartnell governor governor
TecQuipment Ltd, Bonsall Street, Long Eaton, Nottingham NG10 2AN, UK • T +44 115 972 2611 • F +44 115 973 1520 • E
[email protected] • W www.tecquipment.com • An ISO 9001 certified company PE/DB/0908
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THEORY OF MACHINES Page 2 of 2
TM127
Governors
Description
Experiments
A motor and belt turn one of three different governors. A speed control unit (available separately) controls the motor speed. Students use a digital tachometer (available separately) to measure the speed.
• Finding characteristic curves of sleeve position against speed of rotation.
Each governor uses rotating weights (masses) and levers to raise a sleeve against the action of gravity or a spring. Graduations show the position of the sleeve as it rises.
• Comparison of governor types in terms terms of sensitivity, sensitivity, stability and the governor effort.
The Porter and Proell governors include small containers to hold steel balls to vary the mass of the sleeve. Students can also vary the spring rate compression of the Hartnell governor. It also allows adjustment of bell-crank arm ratio and mass of rotating weight. A clear safety ‘dome’ covers the moving parts for safety. safety.
Standard Features • Supplied Supplied with comprehens comprehensive ive user guide • Two-y wo-yea earr warr warran anty ty • Manufactur Manufactured ed in accordanc accordance e with the the latest latest European European Union directives
Essential Ancillaries • Speed Speed Contro Controll Unit Unit (E67) (E67) • Digita Digitall Tach Tachome ometer ter (E64) (E64)
• Finding controlling force curves from the characteristic curves and comparison with theory.
• On the Porter Porter and Proell governors, governors, the effects of varying centre sleeve mass. • On • • •
the Hartnell governor, governor, the effect of varying: bell-crank arm ratio spring rate init initia iall spri spring ng comp compre ress ssion ion
• Demonstration of the conditions that make the governor become unstable.
Essential Services Bench space needed: 1.2 m x 0.6 m Electrical supply: 12 VDC (refer to the datasheet of the E67 Speed Control Unit)
Operating Conditions Operating environment: Laboratory environment Storage temperature range: –25°C to +55°C (when packed for transport) Operating temperature range: +5°C to +40°C Operating relative humidity range: 80% at temperatures < 31°C decreasing linearly to 50% at 40°C
Sound Levels Less than 70 dB(A)
Specifications Nett dimensions and weights: 650 mm x 510 mm x 340 mm and 18 kg Packed dimensions and weight (total): 0.25 m3 and 36 kg
