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High Current DC Motor

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yasser_shoukry

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high current dc motor controller

I have a project in which i have to interface a 24 volt DC Motor with at89c52.

The problem is:
The motor draws about 6.6 Amp to overcome the friction and begin to move, then draws about 0.75 Amp in the steady state.

I tried L298 Full-Bridge but it was not able to drive the motor.

Is there a convinient method to drive this motor ??

Thanx in advance
 

high current dc motor control

I think you can buy an H bridge instead,
it is available at EL NEKHILY .

if u cann't found it u can make it using transistors
and HIGH current RELAYs.

VEILED CAVALIER.
 

bridge h high power

veiledcavalier said:
I think you can buy an H bridge instead,
it is available at EL NEKHILY .

if u cann't found it u can make it using transistors
and HIGH current RELAYs.

VEILED CAVALIER.
Click to expand...

The L298 is an H-Bridge that is able to draw 2.5 Amp repetitve current.
So when i uesd it i was obleged to put a high power resistance to limit the current to the L298 rated current.

This current limiter resistance absorbs some power and voltage so the motor is not able to output the required torque (notice that motor torque is proportional to the applied voltages on the motor windings)
 

24 volt high current h bridge for dc motor

One option is to buy H-bridge MOSFET modules, another option is to build H-Bridge of P-channel and N-channel Mosfets .. I think the latter option is more interesting ..
Here is an example: http://www.geocities.com/fet_h_bridge/np-s.pdf
Using (N) IRFZ40 and (P) IRF9Z30 (or similar Mosfets) you should be able to drive motors of 10A or more .. Just make sure that the power supply can deliver enough current at rated voltage ..

Rgards,
IanP
 

how to current is drawn on start up of dc motor

I want to ask if a PWM signal with a low duty cycle can solve the problem or not.
i.e if i entered a PWM signal with 30% duty cycle is it capable to apply the 24 volt on the motor terminals and assure that the current does not exceed the limit current of the L298 H-Bridge which is 3Amp non repetitive (for 100us) and 2.5Amp repetitive (10ms on)
???
 

dc motor pwm mosfet n p

Thanks IanP for the schematic but,

when I turns off the switch ( to supply the 12Volt) all the wires connected between the drains are burnt which means that a very high current ( more than the 6 amp ) are flowing inside them.

Can any body help me ??
 

limiting dc starting current motor

The maximum current that your motor can draw is called the LOCKED ROTOR CURRENT
and is just that - the current drawn with the motor shaft stalled
- it can be upto 20 X Full Load Current and is drawn at start-up
unless some form of current limiting or soft start is used.

Have a look at the following:

For motor basics:
https://ww1.microchip.com/downloads/en/AppNotes/00905a.pdf

For drive sizing:
https://ww1.microchip.com/downloads/en/AppNotes/00898a.pdf

Other App notes on dc motors including software:
**broken link removed**

https://www.st.com/stonline/products/literature/an/9944.pdf
https://www.st.com/stonline/products/literature/an/4030.pdf

and other motor drive data:
https://www.st.com/stonline/stappl/...ype=6&tname=TL_APPLI_NOTE_TREE_X_DOC&latest=N

regards Polymath
 

motor high current draw

Look at VNH3A automotive integrated 30A full bridge from STMicroelectronics.

It could be your solution.
 

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