Cyfrifo cymhareb cyflymder
Velocity ratio VR
Mewn systemau pwli, ceir newidiadau buanedd trwy ddefnyddio pwlïau meintiau gwahanol ar y siafft yrru a’r siafft yredig. Drwy gymharu maint y ddau bwli, gallwch gyfrifo Cymhareb Cyflymder y system.
Er Enghraifft.
Mae’r diagram isod yn dangos pwmp dŵr a yrrir gan fodur trydan. Cyfrifwch Gymhareb cyflymder y system.
Pwli gyrru = 140mm
Pwli gyredig = 35mm
CC = Diamedr gyredig ÷ Diamedr gyrru
CC = 35 / 140
= 1/4
= cymhareb 1:4
In pulley systems speed changes are made using different sized pulleys on the driver and driven shafts. By comparing the size of the two pulleys you can calculate the Velocity ratio of the system.
For example
The diagram below shows a water pump driven by an electric motor. Calculate the Velocity ratio of the system.
Driver pulley = 140mm
Driven pulley = 35mm
VR = Driven diameter ÷ Driver diameter
VR = 35 / 140
= 1/4
= 1:4 ratio