Sterf
Mechanical
- Jan 14, 2004
- 1
We are looking for design guidelines for designing a precision drive for a linear motor. The motor will be driving a laser scanning head which will image printing plates. Motor stroke is about 24", 10# inertial load, 3# friction, scanning speed about 1 in/sec, return speed ~ 5 in/sec.
Variations in drag forces will come from the rail system, cables, and acceleration, etc.
We plan to use an ironless motor similar to the Anorad LEM-S-1 series, running on a THK/NSK rail and using a Renishaw linear encoder for feedback. The motor is a triphase brushless type.
We have done various motor designs in that past (DC brushless (for air bearing rotary), DC brush, microstepper, AC synchronous, but never CC brushless for a linear motor.
The questions are:
Is there any good literature on the subject? Where can we find it?
What are the basic differences from a rotary drive?
Are there any special precautions to take given the very high accuracy and smoothness requirements
How best to deal with commutation?
Trying not to re-invent the wheel. Any help would be appreciated.
Thanks
Variations in drag forces will come from the rail system, cables, and acceleration, etc.
We plan to use an ironless motor similar to the Anorad LEM-S-1 series, running on a THK/NSK rail and using a Renishaw linear encoder for feedback. The motor is a triphase brushless type.
We have done various motor designs in that past (DC brushless (for air bearing rotary), DC brush, microstepper, AC synchronous, but never CC brushless for a linear motor.
The questions are:
Is there any good literature on the subject? Where can we find it?
What are the basic differences from a rotary drive?
Are there any special precautions to take given the very high accuracy and smoothness requirements
How best to deal with commutation?
Trying not to re-invent the wheel. Any help would be appreciated.
Thanks