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Arduinos and Microcontrollers ref: Rotary Table Mew 249

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SillyOldDuffer23/10/2017 14:05:56
5310 forum posts
1086 photos
Posted by John Haine on 23/10/2017 10:42:25:
Posted by SillyOldDuffer on 20/10/2017 17:35:13:

The problem here is whether your motor can keep up with very short pulses.

Actually the pulses trigger circuits in the driver IC, and are not applied direct to the motor. If you know which IC is used in your driver you can check the minimum pulse width, but I suspect it is only a few microseconds.

Yes of course! I didn't think it through.

With micro-stepping selected the controller output looks like a synthesised sine wave on my oscilloscope. It's made of spikes. I've no idea what happens to the waveform when it hits the motor coils but there must be limits to what the inductors will work with. Another 'find out how that works' addition to my 'to-do' list.

Ta,

Dave

John Haine23/10/2017 17:08:40
2894 forum posts
143 photos

This is a chopped drive - the motor inductance smooths it out to approximately sinusoidal current.

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