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Driving 3-phase motor from 2 amplifier phases
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Benta:

--- Quote from: Dave on December 28, 2018, 01:46:20 pm ---
--- Quote from: Kalin on December 28, 2018, 01:51:43 am ---Are BLDC motors typically permanent magnet motors or squirrel cage?
--- End quote ---
BLDC motors always have permanent magnets inside.

--- End quote ---

Not necessarily. Larger types may have field windings. Those are rare, though.
Dave:

--- Quote from: Benta on December 28, 2018, 03:39:37 pm ---Not necessarily. Larger types may have field windings. Those are rare, though.

--- End quote ---
Could you please provide an example of such motor?

To my understanding, you can't have a field winding on the rotor without having some sort of brushes in place to transfer the current onto the spinning rotor, therefore it would not be a brushless motor anymore (BLDC).
Benta:
The "brushless" part relates to commutation. Slip rings is another story.
It's a question of the classification of the motor.
Some automotive drives used this experimentally to cut cost, neodymium or cobalt-samarium magnets aren't cheap in the needed size.
Zero999:
Slip rings require brushes, so are not brushless.

There is really no such thing as brushless DC motor.
jbb:
I’m not sure if you’re using amplifiers to drive the motor for testing or for some kind of low noise operation, but I have an efficiency concern; I expect that the power factor on your two amplifiers could be quite bad under some conditions. This could lead to unexpectedly high dissipation in a Class B amp.
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