Selection Of The Axis Motor - HEIDENHAIN TNC 410 M Technical Manual

3.2 Selection of the Axis Motor

Procedure
3 – 4
Selection of a synchronous motor and the proper inverter:
Calculation of the static moment from the sum of
• Frictional moment (with horizontal axes)
• Moment for overcoming the force of gravity (for vertical axis)
• Machining moment
Calculation of the desired speed of the motor
Preselection of the motor according to
• Stall torque of the motor ≥ static moment
• Rated speed of the motor ≥ desired speed
Preselection of the inverter according to
• Rated current of the inverter ≥ continuous stall current of the motor
Calculation of the external moment of inertia
• Moment of inertia of the table
• Moment of inertia of the ball screw
• Moment of inertia of the gearwheel on the ball screw
• Moment of inertia of the gearwheel on the motor
Calculation of the total moment of inertia from
• External moment of inertia
• Moment of inertia of the motor
Checking the ratio of external moment of inertia to the moment of inertia of
the motor
Calculation of the acceleration moment
Comparison of the acceleration moment with the
• Maximum moment of the inverter
• Maximum moment of the motor
Calculation of the effective moment at a given load cycle
Comparison of the effective moment at a given load cycle with the rated
torque of the motor
HEIDENHAIN Technical Manual for Inverter Systems and Motors