went to design Power Supply 40v 2a

[xmen33]

Hi

I went to design a 40V 2A power supply to run 3 stepper motor 3A.
i used L298 to deal with motor, the max volt can drive is 50V with 2A " i get this from datasheet L298 is this right? ".

so i went to design this power supply with regulator .

 

[goldsmith]

Hey gentleman!
What is your accurate problem? Say your problem more clear please.
Respect
Goldsmith

 

[xmen33]

The problem is : if i design a 40v 5a power supply and connect it with 3 L298 and 3 stepper , if one of this stepper run only so the current will be 4 - 5A and will burn the L298 and the stepper .
is this right?

 

[kak111]

Current taken to motor-driver ic depends only on the motor load and power supply voltage.
It has nothing to do with the power supply maximum output current.

Simple example:
If you take a 40 volt power supply capable of delivering 10 A current,
and connect load resistor 40 ohms , it takes 1 A current from power source. ( I=U/R)
If you connect 3 pieces 40 ohms resistor to supply , current from power supply is 3A.
If you take out 2 pieces resistor out of supply , current is again 1A.

Current changes only when you change supply voltage or resistor value (Load)
You just need to make sure that the current of power supply for the motor controllers is not too small,
overdimensioning current value in this case is not bad.

As you see above you need take care of voltage and load.

 

[xmen33]

now i understand
so i think that 40v with 10 a is ok.
can u help me with design this power supply , i know that i need transformer , bridge , some cap and regulator .

 

[kak111]

Before designing drivers or power supply , check your motor type and values ( voltage and current )

 

[xmen33]

i have 3 sanyo denki 103h6707 3A and 3 L298

 

[kak111]

I can not find this motor data in internet.
But i think it little bit bigger than this motor.....

sanyo denki 103h6703
Catalogue - The General Catalogue of SANYO DENKI stepping motors - RTA - (Version JPG) - page 21

This is unipolar (6 wire) stepper and can be used parallel or serial connected bipolar (4 wire)
and you can drive this motor with L298 by using 24V (28V) unregulated supply. (That is my opinion )
Motor current can be set with series sense resistors.

If there is someone , who is more familiar with L298 , please give your comment now.

 

[xmen33]

can l298 deal with 3A motor because in datasheet i fount that i can deal with 2 A !