Fuji Electric FRENIC MEGA G2 Series - Appendix E Conversion to other than SI Units

Appendix E Conversion to other than SI Units
Appendix-24
Appendix E Conversion to other than SI Units
All expressions given in Chapter 10 “SELECTING OPTIMAL MOTOR AND INVERTER CAPACITIES” are based on
SI units (The International System of Units). This section explains how to convert expressions to other units.
E.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) Power (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
• 1 [min
-1
] =
2π
[rad/s]  0.1047 [rad/s]
60
• 1 [rad/s] =
60
[min
-1
]  9.549 [min
-1
]
2π
(6) Inertia constant
J [kg•m
2
]: moment of inertia
GD
2
[kg･m
2
]: flywheel effect
• GD
2
= 4J
• J =
GD
2
4
(7) Pressure, 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 barometric pressure
= 1013 [mbar] = 760 [mmHg]
= 101300 [Pa]  1.033 [kg/cm
2
]