[mb123]

The steper motors I have max out at ~50 RPM before they skip (no load)
They are 6.3v 2Amp 200 oz/in 1.8 deg.

I am building a small gantry router 24"x24" and this is not really fast
enough..... only 10 IPM with a 5 TPI direct drive screw.
I thought I could get a much higher RPM from these stepers.

Are there any engineering guidline charts for this sort of thing?

Can there be a problem with the L297/298 driver output signal?
Can a cleaner power supply help this much?
Is this just the limit of a 6.3V steper motor

[RLC]

What voltage are your running to the steppers, they are rated at 6.3v, but what I have read you can run them at 20~25 times that.

[kreutz]

The steper motors I have max out at ~50 RPM before they skip (no load)
They are 6.3v 2Amp 200 oz/in 1.8 deg.

I am building a small gantry router 24"x24" and this is not really fast
enough..... only 10 IPM with a 5 TPI direct drive screw.
I thought I could get a much higher RPM from these stepers.

Are there any engineering guidline charts for this sort of thing?

Can there be a problem with the L297/298 driver output signal?
Can a cleaner power supply help this much?
Is this just the limit of a 6.3V steper motor

What voltage and current is your power supply?

[mb123]

I'm using a 0-15v 30amp power supply.
The capacitor bank is ~45,000 uF
I have fed the stepers 8V this boosts the
speed & tourque some without overheating them.
Maybe I sould go up to 10, 12 > volts.

[phantomcow2]

More than 10 or 12 volts, stick in 35 at least.

[kreutz]

More than 10 or 12 volts, stick in 35 at least.

I agree, 35V at least (40 volt maximum) for L298. It all depends on the phase inductance / phase resistance (L/R) constant of your motor.

[mb123]

I'll run a bigger power supply on it this weekend and let you know what
happens. The motors are hooked up through the full winding
of each phase which is 8.5 ohms..... kind of low.

Thanks for the advise.
Mark

[mojalovaa]

I hawe theat problems , please help me
Driver with l297 and l298.
Stepper 12 V , 0.85 A , 1.8 deg. , 200 step
Power suplay 12V 15 A

[bobsch]

If you know the inductance (in mH) the formula for optimum power supply voltage is 32 times square root of inductance.

[john-100]

For the normal operation L298 IC
the motor current is controled with PWM (Pulse Width Modulation)
and the motor supply voltage has to be more than the rated motor voltage

I would of used a minimum motor supply of 20V
a voltage close to the maximum 46V gives a higher motor speed

John

[packrat]

If you know the inductance (in mH) the formula for optimum power supply voltage is 32 times square root of inductance.

I am not doubting you on this formula, but could you tell me where you find it? I've had discussions on other web sites about this but can't find a definitive proof of my belief in it. Thanks for your help.

[judleroy]

Look at the gecko drive website in there faqs section. It will tell you all you need to know.
Good luck.
Judleroy

[bobsch]

I am not doubting you on this formula, but could you tell me where you find it? I've had discussions on other web sites about this but can't find a definitive proof of my belief in it. Thanks for your help.

I found it, along with a lot of other useful data, on the Gecko web site. Support

[packrat]

Bob, thank you, cary

[mojalovaa]

I think it's impossible to count because if you have a motor that needs to run on 12V and has an inductance of 22mH turns out that we should be 26.59 V, a voltage which is too high due to losses that are created on the engine in the form of heat. I have a motor that runs at 9 V when operating at 12 V to hold its temperature exceeds 80 degrees Fahrenheit, which is only 40% higher voltage, according to this formula comes out that I need 129% higher voltage. As for torque I believe that the way it writes to the formula but if we see that the machine needs to spend a longer Time to work then I do not particularly like.

If the engine specified voltage of 12 V I do not think it should increase the voltage to see the 20% of the voltage to the motor. I think it is a matter of the driver, or a short pulse or can not open the switches in it enough, something we still smrdi drivers around and not around the engine. How much voltage should be at the front door of the managerial L298, maybe a bit 5V to open the door to the PWM outputs enough or real short pulses.
Another question, how to put pictures on this forum, I want to put the scheme.

[zeed]

I think it's impossible to count because if you have a motor that needs to run on 12V and has an inductance of 22mH turns out that we should be 26.59 V, a voltage which is too high due to losses that are created on the engine in the form of heat. I have a motor that runs at 9 V when operating at 12 V to hold its temperature exceeds 80 degrees Fahrenheit, which is only 40% higher voltage, according to this formula comes out that I need 129% higher voltage. As for torque I believe that the way it writes to the formula but if we see that the machine needs to spend a longer Time to work then I do not particularly like.

If the engine specified voltage of 12 V I do not think it should increase the voltage to see the 20% of the voltage to the motor. I think it is a matter of the driver, or a short pulse or can not open the switches in it enough, something we still smrdi drivers around and not around the engine. How much voltage should be at the front door of the managerial L298, maybe a bit 5V to open the door to the PWM outputs enough or real short pulses.
Another question, how to put pictures on this forum, I want to put the scheme.

stepper with 22mH=max voltage would be 150v....
Heat:
80 Fahrenheit=26.6celzius,preety cold for a stepper.Usualy steppers run much hoter than that,somewere near 80 celzius(176Fahrenheit)
On my stepers you could bake an egg,2.2mH running at 50V...Using them over a year now,no problems...
:devious:
Scotty:I'm giving her all she's got, Captain!
James T. Kirk:All she's got isn't good enough!

[mojalovaa]

stepper with 22mH=max voltage would be 150v....
Heat:
80 Fahrenheit=26.6celzius,preety cold for a stepper.Usualy steppers run much hoter than that,somewere near 80 celzius(176Fahrenheit)
On my stepers you could bake an egg,2.2mH running at 50V...Using them over a year now,no problems...
:devious:
Scotty:I'm giving her all she's got, Captain!
James T. Kirk:All she's got isn't good enough!

Error in translate , 80 celzius.

Yes, but if you connect it to 150VDC, much will be losses in the heat, if not mistaken goal is to achieve a greater torque with the lowest losses in the heat, but if my engine that runs on 9v, when you connect it to warm up to 12 V at 80 Celsius, with the time I did not get anything because the torque we are not increased by 40% but only 5%, and what I got with it, except that I reduced engine life.(flame2)