Motor Shaft and Bearings

Design of the Shaft End

Smooth shaft end (standard)	With a non-positive connection, torque transmission must be achieved only by surface pressure to help ensure power transmission without backlash.
Shaft end with round-ended feather key according to DIN 6885	Shaft connections with feather keys are positive. The feather key seating can wear under continuous strain with changing torques and frequent changes of direction, causing backlash as the increased wear causes play between the key and its seating. As a result, rotational quality is reduced due to backlash. Further increasing wear can lead to the feather key breaking and damage to the shaft.

NOTICE
	ADVERSE ROTATIONAL QUALITY Regularly inspect feather key shaft ends for wear and possible damage in applications that have frequent changes in torque and direction. Failure to follow these instructions can result in equipment damage.

Bearing

The back side bearing is designed as a fixed bearing and the bearing on shaft output side as a floating bearing.

Permissible Shaft Load

The life of drives might be limited by the bearing life. You cannot replace the bearing, as the measuring systems integrated in the drive must then be reinitialized.

The graphic shows the definition of shaft load:

The table shows the permissible radial force F_radial [N]:

Motor	1000 RPM	2000 RPM	3000 RPM	4000 RPM	5000 RPM	6000 RPM
ILM0701P	660	520	460	410	380	360
ILM0702P	710	560	490	450	410	390
ILM0703P	730	580	510	460	430	400
ILM1001P	900	720	630	–	–	–
ILM1002P	990	790	690	–	–	–
ILM1003P	1050	830	730	–	–	–
ILM1401M	2210	1760	-	–	–	–
ILM1401P	2210	1760	1530	–	–	–
ILM1402P	2430	1930	-	-	-	-

Basis for calculation:

The permissible axial force F_axial[N] is calculated according to:

F_axial = 0.2 x F_radial

Nominal bearing life L_10h = 20,000 h for a shaft without feather key nut (for operating hours at a 10% detected failure probability)
Ambient temperature = 40 °C / 104 °F (approximately 100 °C / 212 °F storage temperature)
Peak torque = 10% duty cycle
Nominal torque = 100% duty cycle