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  1. Engineering Information
  2. Rotary Components
  3. PM stepping motors

Calculations and Factors

Moment of inertia calculations

Disc・Cylinder

Hollow Disc・Cylinder

Parallel Motion

Haul Up･Down

Load Torque Calculations

Torque Calculations

Conversion factors

Moment of inertia conversion factors

A/B kgm2 kgcm2 gcm2 kgm s2 kgcm s2 gcm s2 oz in2 oz in s2 lb in2 lb in s2 lb ft2 lb ft2
(slug ft2)
kgm2 1 104 107 0.101972 10.1972 1.01972-104 5.46745-104 1.41612-102 3.41716-103 8.850732 23.73025 0.73756
kgcm2 10-4 1 103 1.01972-10-5 1.01972-10-3 1.01972 5.46745 1.41612-10-2 0.341716 8.85073-10-4 2.37303-10-3 7.37561-10-5
gcm2 10-7 10-3 1 1.01972-10-8 1.01972-10-6 1.01972-10-3 5.46745-10-3 1.41612-10-5 3.41716-10-4 8.85073-10-7 2.37303-10-6 7.37561-10-8
gcm s2 9.80665 9.80665-104 9.80665-107 1 102 105 5.36174-105 1.38874-103 3.35109-104 86.79606 2.32714-102 7.23300
kgm2 9.80665-10-2 9.80665-102 9.80665-105 10 1 103 5.36174-103 13.88741 3.35109-102 0.86796 2.327143 7.23300-10-2
gcm s2 9.80665-10-5 0.980665 9.80665-102 10-5 10-3 1 5.36174 1.38874-10-2 0.335109 8.67961-10-4 2.32714-10-3 7.23300-10-5
oz in2 1.82901-10-5 0.182901 1.82901-102 1.86506-10-6 1.86506-10-4 0.186506 1 2.59008-10-3 6.250-10-2 1.61880-10-4 4.34028-10-4 1.34900-10-5
oz in s2 7.06154-10-3 70.6154 7.06154-104 7.20077-10-4 7.20077-10-2 72.00766 3.86089-102 1 24.13045 6.250-10-2 0.167573 5.20833-10-3
lb in2 2.92641-10-4 2.92641 2.92641-103 2.98411-10-5 2.98411-10-3 2.98411 16 4.14414-10-2 1 2.59008-10-3 6.9444-10-3 2.15840-10-4
lb in s2 0.112985 1.12985-103 1.12985-106 1.15213-10-2 1.152126 1.15213-103 6.17740-103 16 3.86088-102 1 2.681175 8.33333-10-2
lb ft2 4.21403-10-2 4.21403-102 4.21403-105 4.29711-10-3 0.4297114 4.29711-102 2.304-103 5.96755 144 0.372971 1 3.10809-10-2
lb ft2
(slug ft2)		 1.35582 1.35582-104 1.35582-107 0.138255 13.82551 1.38255-104 7.41289-104 192 4.63306-103 12 32.1740 1

Torque conversion factors

A/B N・m N・cm kg・m kg・cm g・cm oz-in ft-lb in-lb
N・m 1 102 0.1019716 10.19716 1.019716×104 1.41612×102 0.737562 8.85074
N・cm 10-2 1 0.1019716×10-2 0.1019716 1.019716×102 1.41612 7.37562×10-3 8.85074×10-2
kg・m 9.80665 9.80665×102 1 102 105 1.38874×103 7.23301 86.79624
kg・cm 9.80665×10-2 9.80665 10-2 1 103 13.8874 7.23301×10-2 0.867962
g・cm 9.80665×10-5 9.80665×10-3 10-5 10-3 1 1.38874×10-2 7.23301×10-5 8.679624×10-4
oz-in 7.06155×10-3 0.706155 7.20077×10-4 7.20077×10-2 72.0077 1 5.20833×10-3 6.250×10-2
ft-lb 1.35582 1.35582×102 0.1382548 13.82548 1.382548×104 192 1 12
in-lb 0.112985 11.2985 1.15212×10-2 1.15212 1.15212×103 16 8.33333×10-2 1
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Related page

PM stepping motors

Engineering Information for PM stepping motors

Technical Data

Selection of PM Motors
Custom Items
Choice of Coil Extension Method
Drive Circuitry
Calculations and Factors
Outline - PM stepping motors
Torque Requirements
Resistance Value
Temperature
Magnet
Coil Extension Method
Gear, Pulley etc.
Std. Parts
Std. Dimensions
Drive circuit and wiring diagram

Precautions of Use

Cautions for Using Motors
Warnings and Precautions

Explanation of Technical Terms

Glossary for Technical Terms

Click here for technical questions, requests for various materials, etc.

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