When using a gearhead with an induction motor, what should I refer to when determining the rotation speed?

For reference when using induction motors with gearheads attached, the catalog includes a table called "Permissible Torque When Gearheads Are Attached." As a guideline, use a value 2 to 20% less than the rotation speed listed in this table.

The rotational speed listed in "Permissible torque when gearhead is installed" is the converted value obtained by dividing the synchronous rotational speed (50Hz: 1500r/min, 60Hz: 1800Hz/min) by the gearhead reduction ratio. The actual rotational speed is several percent lower than the synchronous rotational speed under no-load conditions, and becomes even lower as the load increases.

The load torque that can be applied to an induction motor is limited by the rated torque, and the rated rotation speed is approximately 1200 r/min (-20% of the synchronous rotation speed) at 50 Hz and approximately 1500 r/min (-17% of the synchronous rotation speed) at 60 Hz.