Hi,
Recently I have encountered a few problems sizing gearboxes for applications with servo motors. I went through previous posts but could not find a relevant answer.
Most gearbox manufactures supply information like inertia, efficiency, nominal (or maximum) torque, and speed. Is it possible to calculate (or estimate) from this data no load (friction) torque of the gearbox? In the other words, how much power is dissipated in the gearbox when no load is applied on the output shaft? How do you define efficiency in this case?
To put things into perspective, I have a right angle NEMA23 size 3:1 planetary gearbox. The no load torque is so high the motor uses almost 60% of its power just to turn the gearbox itself. On the other hand, the same size inline gearbox works with no problem. The manufacturer clams 95% efficiency in both cases and nominal torque of 9Nm (the motor can deliver continuous only 0.19Nm).
Can you please put me on the right track or direct to relevant literature.
Regards,
Pawel
Recently I have encountered a few problems sizing gearboxes for applications with servo motors. I went through previous posts but could not find a relevant answer.
Most gearbox manufactures supply information like inertia, efficiency, nominal (or maximum) torque, and speed. Is it possible to calculate (or estimate) from this data no load (friction) torque of the gearbox? In the other words, how much power is dissipated in the gearbox when no load is applied on the output shaft? How do you define efficiency in this case?
To put things into perspective, I have a right angle NEMA23 size 3:1 planetary gearbox. The no load torque is so high the motor uses almost 60% of its power just to turn the gearbox itself. On the other hand, the same size inline gearbox works with no problem. The manufacturer clams 95% efficiency in both cases and nominal torque of 9Nm (the motor can deliver continuous only 0.19Nm).
Can you please put me on the right track or direct to relevant literature.
Regards,
Pawel