Quote:
Originally Posted by BrianG
The MM has 18 fets.
In brushless mode: At any one time, a 3 FETs are channeling battery + to the motor and 3 FETs are channeling battery - to the motor. The current rating is limited by the combined amperage rating of those 3 FETs.
Brushed with reverse: Similar in concept as above, except one phases is not used.
High power brushed: This hookup does not have reversing, but 9 FETs are on all at once going to the motor + coil. While the - battery goes directly to the - motor. This effectively triples the amount of current available to the motor compared to the other two hookups. This might be useful if you want to drive 2 or 3 motors at the same time.
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Hi Brian!
The MM actually has 30 FETs. 18 on top, and 12 on bottom of the main power board.
So in reversing brushed there are 5 FETs high side, and 5 FETs low side driving the motor (and they are in series -- so it doubles the FET loss)
In high power brushed, there are 15 FETs driving the motor, and only on one side. But no reverse...
