MD03 INPUT/OUTPUT VOLTAGE

[perec]

Hi,

Some months ago I purchased four MD03 motor control in superrobotica.com (spain), I read that the output voltage was up to 50VDC. But now The features have changed, the output voltage is up to 24VDC.

I want to drive my motors between 36 - 48 VDC. My question is:
Is MD03 circuit able to support 36 or 48 VDC?

Thanks

[Gerry]

The spec' change is as much just clarification as anything else. Nothing has changed on the MD03 (or the MD22). It still uses 60v drive transistors and the same components as before. We are not going to be changing anything on the board.

However, a reversing motor can effectively double the drive voltage. We were specifying on the voltage handling of the board instead of the real absolute maximum voltage the module should be powered with, which is 30v. Adding in a safety margin: its a 24v module.

[perec]

Thanks Gerry,

I don't understand you when wroten (a reversing motor can effectively double the drive voltage.)

In my case, I have a 36-42VDC supply power to drive a VDC motor (0-36...42VDC). According your response I can't connect the 36-42VDC power supply to MD03.

Please, can you confirm this?

In this case, do you have any board to drive 36VDC motors ? (10 - 12 amp, màx.)

Thanks

Pere

[Gerry]

When a motor is running, it is also a generator. It generates a voltage just short of the applied voltage. This is what limits the speed of a freely rotating motor for any given voltage. If that motor power is suddenly reversed while the motor is still rotating forwards, the peak voltage across the h-bridge will be twice the applied voltage. So an H-bridge rated at 24v must be able to withstand 48v. The transistors on the MD03 are rated at 60v to give an additional safety margin.
This is why the MD03 and MD22 are rated at 24v.