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| 8/6/2012 4:51 PM | |
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Hello monir, To identify motor inertia, it would be best to contact the manufacturer (or representative) for the motor. Note: Always pay close attention to detail to units of dimension, but with inertia this is even more important. There are about ten different units of measure that are commonlyusedto define motor inertia. These different units can be in English units and metric units and they vary byextremely large numbers. Following is a website location to help with conversion of units. http://www.unitconversion.org/unit_converter/moment-of-inertia-s.html From context of your question stating that you are using sensorless vector control on SINAMICS S120 drive,it appears the motor is a squirrel cage induction motor. Since motor inertia is not often a highly critical characteristic fordrive applications usingsquirrel cage induction motors the motor manufacturer may not publish the motor inertia incatalogs. However,if you contact motor manufacturer andsupply complete part number then the manufacturercan normally provide the motor inertia. Note some motor manufacturers may label motor inertia as rotor inertia. If you were using a servo motor, themotor manufacturer normally provides motor inertiain catalog since quite often a servo motor isquite dynamically changing speeds, starting, and stopping to move loadwithin the application. |
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