V
We need to turn a round platform ( diameter =3D mm.100, height =3D mm 50 = and weight =3D 300g) by using a stepping motor having 200 steps. We
need to have a constant speed of 600 turns/minute and a very uniform motion.
We drive the motor by a microstepping controller by Toshiba.
We measure the motion uniformity by means of a laser mounted on the platform. When the laser beam hits a photodiode installed in a fixed position, a counter start counting clocks with a period of 160 nsec.
When the laser beam pass again on the above photodiode the counter will stop.
Reading the counter value we note a difference from two reading. This difference is randomly variable from 3 periods till 40 periods that is not acceptable for our needs. We think this is due to the jerky motion of the stepping motor.
It is possible to obtain a uniform motion (difference within 5 clocks) from a stepping motor?
The platform is accurately balanced.
We thank everybody can give us some hints.
Vittorio Mattiolo
need to have a constant speed of 600 turns/minute and a very uniform motion.
We drive the motor by a microstepping controller by Toshiba.
We measure the motion uniformity by means of a laser mounted on the platform. When the laser beam hits a photodiode installed in a fixed position, a counter start counting clocks with a period of 160 nsec.
When the laser beam pass again on the above photodiode the counter will stop.
Reading the counter value we note a difference from two reading. This difference is randomly variable from 3 periods till 40 periods that is not acceptable for our needs. We think this is due to the jerky motion of the stepping motor.
It is possible to obtain a uniform motion (difference within 5 clocks) from a stepping motor?
The platform is accurately balanced.
We thank everybody can give us some hints.
Vittorio Mattiolo