Using N mosfet to switch ESC to BLDC phases

Question

I have an ESC that powers 36v 3 phase BLDC motor. The ESC has limited functionality and can power motor only in one direction. If I switch manually two of the ESC to Motor phase connections, than the motor direction will change. Now, I want to do the same i.e. switching phase to phase connections with 4 power mosfets.

As in scheme, the blue ESC phase will be connected to Mosfet source and the drain will be connected to Motors yellow phase. The next mosfet will connect to ESC yellow at source and motor blue at drain. Two other mosfets will connect blue to blue and yellow to yellow.

I won't do the switching while motor is on so I assume it should be safe.

How can I connect MOSFET's gate to Arduino ? I need no pwm just ON/OFF.

Answer 1

This is covered fairly well in an EDN.com “MOSFET pair makes simple SPDT switch” article. You would use two of the SPDT circuits to make a DPDT. Attach switch commons to yellow and blue, and attach the “switch points” of one circuit to motor yellow and blue, and those of the other vice versa. Attach both control pins to one Arduino IO pin. The picture below comes from the referenced article, which shows the circuit in use for a primary-power vs secondary-power application. See the article for details.