Inertia matching question
Inertia matching question
(OP)
I need a little help understanding the logic of the statement below.
Quote:
The secret to the extra boost of inertia is its special inertia flywheel, which adds from three to 10 times the inertia of a standard servo motor. This flywheel replaces the more expensive gearbox traditionally added to the motor for applications where the customer has a high load-to-rotor inertia mismatch. Now, on applications where customers would normally add a gearhead, they can simply use a motor, saving money and eliminating the speed constraints normally associated with a gearhead.





RE: Inertia matching question
1) Use a gearbox as an "inertia translator" for the load. For a speed reduction gearbox, the reflected inertia is equal to the gear ratio squared times the load inertia (plus some added inertia from the gears).
2) Use a flywheel to add inertia to the motor.
RE: Inertia matching question
The real question should be do the inertias have to be matched? If not then why add inertia to the motor?
Peter Nachtwey
Delta Computer Systems
http://www.deltamotion.com
RE: Inertia matching question
That is what I thought, here is the link to the advertisement:
http:
I agree. .
RE: Inertia matching question
Adding gear box is one thing, motor interia is another.
For fast servo - never do this (add interia).
For spinning with one dirrection and with one speed - yes , adding interia makes system smoother.
It also minimizes torque ripple cause by commutation in 6-step drives.
Stability - now can play with poles and zeros inside DSP driving this motor.