Electronic – Simple Motor driver circuit diagram help

dc motormosfetschematics

I am trying to create a small motor driver for a DC motor, 9 V – 12 V. Max current and stall current I do not know, but I am using the stock motor of a Blade CP Helicopter. I just want to know if I am using parts that will work and what parts I should replace.
The FET i am using is a 22N50 N-channel FET. Any advice or things I should look out for?

Motor will be only going one direction and will be controlled from a 3 V – 5 V PWM

Yes, I know about the diode across the motor which is a 1N4000.

The schematic:
enter image description here

Best Answer

A quick search on the 'net' gives the following

Model: R370

Round type diameter: 24.4 x 30.8 (L)

Voltage (V): 6.0 No load current 0.03 A; speed 4,950 rpm Max efficiency current 0.19 A; speed 4,280 rpm; torque 19 gcm Max output current 0.625 A; speed 2,475 rpm; torque 170 gcm Stall current 1.22 A; torque 140 gcm

Voltage (V): 31.0 No load current 0.035 A; speed 11,140 rpm Max efficiency current 0.2 A; speed 9,530 rpm; torque 43 gcm Max output current 0.63 A; speed 5,570 rpm; torque 149 gcm Stall current 1.22 A; torque 298 gcm

  • This sounds like a possible for your motor...

If the motor you have is about this size (24.4mm Dia x 30.8mm L), then its stall current will be about the same.

And for your FET - a max current around 22A peak around 80A

This FET should easy handle the stall current for your motor.

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