Fuji Electric frenic mini series, User Manual

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A-24
App.F Conversion from SI Units
All expressions given in Chapter 7, "SELECTING OPTIMAL INVERTER MODEL" are based on
SI units (International Metric System of Units). This section explains how to convert expressions to
other units.
[ 1 ] Conversion of units
(1) Force
•
1 (kgf) ≈ 9.8 (N)
•
1 (N)
≈
0.102 (kgf)
(2) Torque
•
1 (kgf·m) ≈ 9.8 (N·m)
•
1 (N·m)
≈
0.102 (kgf·m)
(3) Work and Energy
•
1 (kgf·m)
≈
9.8 (N·m) = 9.8(J) =
9.8 (W·s)
(4) Power
•
1 (kgf·m/s)
≈
9.8 (N·m/s) = 9.8 (J/s)
= 9.8(W)
•
1 (N·m/s)
≈
1 (J/s) = 1 (W)
≈
0.102 (kgf·m/s)
(5) Rotation speed
•
(rad/s) 0.1047 ) s / rad (
60
2
(rpm) 1 ≈
π
=
•
(rpm) 9.549 (rpm)
2
60
) s / rad ( 1
≈
π
=
(6) Inertia constant
J (kg·m
2
) :moment of inertia
GD
2
(kg·m
2
) :flywheel effect
•
GD
2
= 4 J
•
4
GD
J
2
=
(7) Pressure and stress
•
1 (mmAq)
≈
9.8 (Pa)
≈
9.8 (N/m
2
)
•
1(Pa) ≈ 1(N/m
2
) ≈ 0.102 (mmAq)
•
1 (bar)
≈
100000 (Pa)
≈
1.02 (kg·cm
2
)
•
1 (kg·cm
2
)
≈
98000 (Pa)
≈
980 (mbar)
•
1 atmospheric pressure = 1013 (mbar)
= 760 (mmHg) = 101300 (Pa)
≈ 1.033 (kg/cm
2
)