Page 294 - Electric Drives and Electromechanical Systems

292 Appendix 1: Units and conversion factors

Plane Angle
Units Conversion factors
rad Radian 1 rad ¼ 57.296 o
rev Revolution 1 o ¼ 1.7453 10 2 rad
o 3
Angular degree ¼ 2.7778 10 rev
‘ Angular minute 1 rev ¼ 6.2832 rad
‘’ Angular second
Angular Velocity
Units Conversion factors
rad s 1 Radians per second rad s 1 ¼ 0.15915 rev s 1
rev s 1 Revolutions per second ¼ 9.5493 rev min 1
rev min 1 Revolutions per minute 1 rev min 1 ¼ 1.6667 10 2 rev s 1
o 1 o 1
min Degree per minute ¼ 6 s
¼ 0.10472 rad s 1
o
1 rev s 1 ¼ 360 s 1
¼ 6.2832 rad s 1
Angular Acceleration
Units Conversion factors
rad s 2 Radians per second square 1 rad s 1 ¼ 0.15915 rev s 2
rev s 2 Revolutions per second squared ¼ 9.5493 rev min 1 s 1
1 rev s 2 ¼ 6.2832 rad s 2
Mass
SI units Conversion factors
3
g Gram 1kg ¼ 10 g
kg Kilogram ¼ 2.2046 lb (mass)
Force
SI units Conversion factors
N Newton 1 N ¼ 0.22481 lbf
¼ 7.2330 poundals
Torque
SI units Conversion factors
N m Newton metre 1 N m ¼ 0.7376 lb ft
¼ 8.85075 lb in
¼ 141.612 oz in