Can I use another H-bridge to increase torque of DC motor ?

Other Hardware Motors, Mechanics, Power and CNC
1

Hello everyone,

After modifying a RC Servo Motor,specifically Hitec HS-485HB, I now have control over its DC motor pins and i able to read the POT signal.

I am able send PWM signals to DC motor of the Hitec HS-485HB via a SN754410NE Quad H-Bridge. However, after sending a low PWM signal i notice that the servo stalled and it could hardly move upward but by increasing the PWM signal it did move upward.

My question is, if i used a different H-bridge, say maybe like a L293N or any other that is able to use more than 1.1A per channel, can I increase the power in the DC motor for the low PWM signal and thus increase the torque at low PWM signals ?

My power source is : 5V 10A

Izy :slight_smile:

2

Need to know the stall current of the motor.

3

And that chip is a dual H-bridge, quad half-H-bridge, not a quad H-bridge.

4

Need to know the stall current of the motor.

I cant get it because I don't have enough load at hand to achieve it.
I placed some load on it and i sent a PWM signal of 224 to it. This 224 is the lowest PWM signal that can be sent to it that wont cause it to move up with the load attached. When stalling at this pwm signal the measured current to the DC motor was 430mA.

After increasing the PWM signal to the minimum level that it moved against gravity with the load attached, the current in the DC motor went to 530-550 m..

Still not sure if changing to a L298 or even paralleling will increase the current at the 224 PWM signal :confused:

@MarkT thanks :slight_smile:

5

Stall current = supply voltage / winding resistance, so just measure the winding resistance...

The 75441 is rated to 1A maximum, note.