From: Anthony Fremont
Subject: Re: How to determine the " common " of a Teac Motor taken out from a 5 1/4 disk drive??
Date: Sun, 19 Jan 2003 12:25:29 GMT
NNTP-Posting-Date: Sun, 19 Jan 2003 06:25:29 CST
Organization: Road Runner - Texas
Chuck Simmons wrote:
> Third, I have not yet seen a stepper with a common except for the
> Superior Electric Slosyn synchronous motors. All others I have seen are
> 4 wire or 6 wire with no "common." (An exception is the Berger-Lahr five
> phase motors but you don't have one of those.)
Many 5.25 inch floppy drives have five wire Unipolar steppers in them. One
lead is a common to the other four. There are also six wire motors that
have two commons which are simply center taps on the coils. These can
often be used as Unipolar motors by hooking the two commons together, or as
Bipolar's by just ignoring the commons.
> Caveat. Brushless DC motors are properly classed as stepper motors since
> they are magnetically identical to steppers. However, it is unusual to
> refer to a brushless DC motor as a stepper. Moreover, my comments refer
> to permanent magnet steppers which seem to be the most common type.
I've never heard that before about brushless motors.
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