Re: Variable reluctance motor drive?
- From: Stef <stef33d@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Fri, 01 Aug 2008 09:54:05 +0200
In comp.arch.embedded,
John Speth <johnspeth@xxxxxxxxx> wrote:
I'm now having my doubts I am using a VRM. The motor has definite cog stops
which I believe would indicate it's *not* a VRM.
The motor is clearly an OEM model. It has 36 cog stops. It has three
windings with a common point verified with an ohm-meter. I can see nine
winding "lobes" through holes in the rotor. The windings are stationary and
are mounted on a PCB. Each lobe's winding axis is radially oriented from
the rotation axle and distributed evenly (360/9 = 40 deg separation). The
rotor is cup shaped hiding a clear view of the internal parts. It appears
to have some sort of black material ringing the inside periphery of the cup
sides. I assume that is a permanent (or a group of permanent) magnets.
Really sounds like a sensorless brushless DC motor, as mentioned by another
poster.
Easiest way to drive these is by using e specialized driver IC, the
TDA5140A is one example of such a chip.
--
Stef (remove caps, dashes and .invalid from e-mail address to reply by mail)
Early to rise, early to bed, makes a man healthy, wealthy and dead.
-- Terry Pratchett, "The Light Fantastic"
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