Step and Direction Pulse Length

[arhijawi]

I doubt if this is correct. Whatever the "step angle" of the motor is doesn't necessarily indicate what a step to the Driver will do. The Driver likely does mircrostepping or other things to servo the motor to higher resolution.

Hello Tom,

Then how to know what the pulses do to the driver, how did you deduce the 37us in your previous post?

Great thanks

[arhijawi]

Hello ChipsNChips,

It is more of a home study, but the data acquisition device I am using is much more capable than an old fashion oscilloscope, not only I see the pulses, I can measure the duty cycle, period, frequency and rising or falling edges count, the data file I attached was a sample for sending a Move command of 10000, I want to know how many steps will that cause. I really appreciate your help in explaining, but I understand the mathematics behind waves. My problem is that every time I run, I get a different reading.
The reciprocal of frequency results in the period, the time required to complete one cycle, now this cycle has a duty cycle, a ratio between how long it was on vs how long it was off, in your previous post you said that

If you are generating a pulse train at 200Khz, then when the pulse length equals 5us, each pulse's trailing edge runs into the leading edge of the NEXT pulse and there will be NO SPACE between the pulses. So your 200Khz pulse train becomes a DC Voltage, either 0 or +5 Volts, depending on the polarity.

That is the case when the pulse has a 100% duty cycle.

It is not the method of measurement that I'm having troubles with it's the pulses I'm sending from the Kflop. I am trying a higher sampling frequency today, I will update you with the results soon.

Regards

[TomKerekes]

Hi ArHijawi,

Then how to know what the pulses do to the driver

You would need to obtain that information from the manufacturer of your Drivers. Or run an experiment such as give a certain number of pulses and observe how far the motor moves.

how did you deduce the 37us in your previous post?

You said the problem occurs at 27KHz. 27KHz=37us period.

[arhijawi]

Hello Tom,

Thanks a lot for your help, can you suggest other 3 phase motor and driver that I can look at?

Regards

[TomKerekes]

Hi ArHijawi,

I don't think your current 573S20-EC-1000 is a 3 phase motor.

Regards

[RCaffin]

Widely advertised on the web (inc eBay):
Leadshine 3-phase Hybird Servo Drive HBS57+573S20-EC-1000

Cheers
Roger

[TomKerekes]

Ah! You are absolutely correct it is a 3-Phase motor. The huge number of poles like a stepper threw me.

I suppose something comparable would be the Teknic EasyDrives.

https://www.teknic.com/products/clea.../clearpath-sd/

Regards
TK