Brushless DC Motor controller ICs

[mark]

Can anybody recommend any 6-step commutation BLDC motor controller
ICs; I can't use a microcontroller or DSP as this is a safety critical
application which precludes the use of software.

I'm considering UCC2626 from TI, however, I really need something with
synchronous rectification.
I'm not that familar with motor control so any help would be much
appreciated.

 

[Jamie]

Can anybody recommend any 6-step commutation BLDC motor controller
ICs; I can't use a microcontroller or DSP as this is a safety critical
application which precludes the use of software.

I'm considering UCC2626 from TI, however, I really need something with
synchronous rectification.
I'm not that familar with motor control so any help would be much
appreciated.

That kind of controller requires some sort of feed back on the
angles.
If you look at the docs, it talks about HALL returns. those are
HALL pick ups that report back as to where the rotor is.. This
in turns allows the controller to help maintain the position of the
rotor to stay in sync.. I don't know if that is what you're referring
to how ever, it maybe what you're looking for.

http://webpages.charter.net/jamie_5"

 

[Jamie]

I don't keep close track of available-off-the-shelf motor-controller
IC's, so I don't know if what I did about 15 years ago for Bosch...
electronically commutated simply by sensing winding voltages, is
available as a standard part. Hall effect sounds _way_ expensive to
me.

...Jim Thompson

Hall sensors are very cheap.
Normally they are mounted in a group that slightly offsets the
index notches.. this allows for the drive controllers to jokey the
the rotor in place.
Most of the time they are mounted internally, synchronized with
the stator windings so there is no problem with alignment at
installation time.
They make 2 varieties of motors for this application.
a normal induction motor and a motor with a PM in the rotor.
the PM has much more torque at lower speeds while other does
not but deals very good at higher RPM's..

Today's technology now uses Vector Feed back system which is just a
AC motor with tightly laminated bonded windings with a larger rotor in
many cases and potted heat sinked cases for heat extraction.
When operated in the "Vector Close Loop mode" via (Q encoder), these
units can step down to very fine moments if so desired and lock them
self's into position.

It's a cheaper alternative to other expensive precision controlled
motors.


http://webpages.charter.net/jamie_5"

 

[Jamie]

A/C fan motors for Mercedes don't need precision positioning, just be
very quiet, even during acceleration/deceleration... and not run
backwards even when driven by wind ;-)

...Jim Thompson

Ok, I'll keep that in mind when I'm driving my Hyundai! )


http://webpages.charter.net/jamie_5"

 

[Jamie]

You might find a Bosch motor under the dash ;-)

...Jim Thompson

Well, if that is case it must be junk because I needed my blower
motor replaced recently!


http://webpages.charter.net/jamie_5"

 

[Michael Wieser]

Can anybody recommend any 6-step commutation BLDC motor controller
ICs; I can't use a microcontroller or DSP as this is a safety critical
application which precludes the use of software.

I'm considering UCC2626 from TI, however, I really need something with
synchronous rectification.
I'm not that familar with motor control so any help would be much
appreciated.

Toshiba TB6575 and others from this "family", sensorless...

hth
-
Michael Wieser
--

 

[BobG]

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