The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
Subject: Stepper motor question
Date: Sun, 12 Jan 2003 03:17:14 -0800
Organization: Posted via Supernews, http://www.supernews.com
X-Newsreader: Microsoft Outlook Express 6.00.2800.1106
X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106
This is my first time working with a stepper motor and related drive
I am using an optical encoder w/ 360 pulses/rev to generate a quadrature
waveforem (2 bit grey code). This signal goes through logic and a Step
pulse & Direction are generated as outputs. These are fed into an Alegro
5804. The 5804 is set up for full step with option for one or two phase.
The motor is a 6 wire unipolar motor. 12V 75ohm
The system works fine while turning the dial on the encoder. The issue is
that if I turn the dial too fast the stepper motor stops rotating and
"buzzes" until I slow the ecoder down again. This is regardless of one or
two phase operation on the Alegro.
The Alegro 5804 docs state that a minimum step input pulse width is 3us. I
get nowhere near that with manual rotation. This condition occurs with a
step input of around 10ms as seen on my scope. So I have ruled that out.
Is this motor resonance? What is causing this and how do I get rid of it?
I do not need extreem speed on the motor. It is being used to manually
control a butterfly valve on a propane fired foundry. The stepper motor is
geared down such that it requires about 1000 steps to go from open to
closed, this was done to increase resolution on controlling the valve.
Thank you in advance.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup