Page 293 - Electric Drives and Electromechanical Systems

Appendix 1: Units and conversion

factors

The tables below give the definitions and conversion factors for quantities which are widely
found in the design of motion control systems.

Length
SI units Conversion factors
Km Kilometre lm ¼ 10 3 km
3
m Metre ¼ 10 mm
6
mm Millimetre ¼ 10 mm
9
mm Micrometre ¼ 10 nm
nm Nanometre 1in ¼ 25.4 mm
1ft ¼ 0.3048 m
Area
SI units Conversion factors
6
m 2 Square metre 1m 2 ¼ 10 mm 2
mm 2 Square millimetre ¼ 10.764 ft 2
Volume
SI units Conversion factors
m 3 Cubic metre 1m 3 ¼ 1000 L
9
L Litre ¼ 10 mm 3
4
mm 3 Cubic millimetre ¼ 6.1024 10 in 3
Linear Velocity

SI units Conversion factors
3
km s 1 Kilometres per second 1ms 1 ¼ 10 mm s 1
ms 1 Metres per second ¼ 3.6 km h 1
mm s 1 Millimetres per second
Linear Acceleration

SI units Conversion factors
ms 2 Metres per second squared 1 m s 2 ¼ 39.370 in s 2

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