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Topic: DC motors, PCA9685, MOSFET placement (Read 130 times) previous topic - next topic

eptheca

Hi,

I have an installation with 7 DC motors controlled by a PCA9685 and logic level N-Channel MOSFET's
The motors are all placed about 2 meters (6 feet) from the "hub" with the Arduino and the PCA9685.

Will it make any difference if the MOSFET is placed in the "hub" or close to the motor?

Either the power cable with 24V is stretched 2 meters from the MOSFET to the motor, or the PMW signal cable from the PCA9685 is stretched 2 meters to the MOSFET.

Same difference or a preferred option?

Cheers, Hal 

 

ballscrewbob

Closer to the PCA9685 so that there is less voltage drop in triggering the mosfet.

It may not be the answer you were looking for but its the one I am giving based on either experience, educated guess, google (who would have thunk it ! ) or the fact that you gave nothing to go with in the first place so I used my wonky crystal ball.

eptheca

Thanks for the quick reply, makes sense

MarkT

And use twisted pair for all the high current wiring runs to motors and motor supply.

Don't forget the free-wheel diodes across each motor.
[ I DO NOT respond to personal messages, I WILL delete them unread, use the forum please ]

eptheca

And use twisted pair for all the high current wiring runs to motors and motor supply.

Don't forget the free-wheel diodes across each motor.
Thanks for the tip :)

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