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From: Chuck Simmons
Organization: You jest.
X-Mailer: Mozilla 4.61 [en] (X11; U; Linux 2.0.33 i586)
Subject: Re: Hard drive motor question
Date: Fri, 18 Oct 2002 00:33:37 GMT
NNTP-Posting-Date: Thu, 17 Oct 2002 17:33:37 PDT
> After reviewing the responses and a bunch of data sheets off the web, I
> guess I should re-do my question.
> There does seem to be a lot of "brushless DC motor drive circuit" IC's
> (mostly Phillips) out there that can drive this type of motor. Some seem to
> require hall sensors, some not.
> Can a TDA5140 or TDA5141 be used as a simple single speed driver for these
> motors (with correspondingly few other components)? Seems these chips have
> a lot of other functions........is there an equivelent but simpler IC that
> simply drives the motor?
I didn't find a TDA5141 data sheet. Does it have hall switch or linear
hall sensor inputs? Actually most standard products do. The drivers for
sensorless running of brushless DC motors are designed to accept a
current command and commutation commands from a microcontroller. I have
never seen a stand alone brushless DC motor for a sensorlsss motor but
there are many for motors with sensors.
A driver that requires hall switch inputs can be used to drive a
sensorless motor such as used in HDDs by using 3 D-flops as I mentioned
previously in a Johnson counter to generate fake hall states. This can
be used at very low speed and low torque.
... The times have been,
That, when the brains were out,
the man would die. ... Macbeth
Chuck Simmons firstname.lastname@example.org
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