New Machine Build- 8.5 Volts For My 5.7 V Stepper..... What's the damage??

[SeQueNcer]

I've Vexta c6244-9212K Two Phase ...5.7 V / 1.6A .....

My Questions...

1- when i measure the Current through the Two coils together....should i get 1.6 A ?? or 1.6 Per phase.... then i should get 3.2 ???

2- When i've applied 8.5 V "This is Measured during motor Rotation... I mean after all Drops in Circuit ??

3- is this motor enough to drive a CNC Machine which is 1.75 M X 3 M working on chains ...? with gearBox Ratio 1:2.5...i'm working on a 1200 Pulse per Second so through computations it should move along the 3 Meters within 9 Seconds....

when i've applied 6 V..after Drop i get 4.5 V / 1.8 Amp ....for both Phases.. as i said i measure the current for the whole motor .

When i've applied 10 V....after dop i got 8.5 / 3.6 Amp .... For both phases..

in both cases the motor becomes Warm.... but in the second case it becomes Warmer....or nearly Hot..

So .... Give me Your Comments.... & I'm Really thankful

[vtxstar]

You are putting too much current through the windings regardless of how you measure it. Warm motors are OK. HOT motors die quickly and may damage your controller when they die.

The windings are rated at 1.6A. I recommend using the rated supply unless you add power resistors to limit the current to the rated value.

Here is an interesting webpage with information related to your questions - CLICK HERE

[Jason Marsha]

They key to steppers is to stay within the rated current but crank the voltage up. I use 34 volts with my 3.6 volt steppers.

Jason

[pminmo]

How are you driving the motors, and how may wires are the motors?

[SeQueNcer]

1st thank you for all who tended to help me

in this link

Click here

my driver is similar to
A 2-Phase (winding) Unipolar (single polarity) Stepper.

my Question ... 1.6 Ampere per phase ..and the motor is two phases...means that the motor should use 1.6 * 2 Amperes from the power source ? or the 1.6 is the net usage ?

& what's the best way to use to get the maximum torque...

thanks


E.Mahmoud Darweash
A 2-Phase (winding) Unipolar (single polarity) Stepper Schematic

[pminmo]

It depends on the driver. If your using 2 phase on, full step unipolar in a circuit to deliver 1.6A/phase then yes your power supply will be providing 3.2A. If you are using wavedrive, then it is 1.6A draw from the power supply. If it is a chopping driver, then it would be less and the amount depends on the power supply voltage vs the motor coil voltage/current rating.
Maximum torque would depend on motor speed. A stepper has more torque at lower rpm's. As you go up in motor rpms, a stepper naturally starts to loose torque. That power curve can be extended by using higher supply voltages. This might help you on maximizing your motor power: http://pminmo.com/PMinMOwiki/index.p...chanical_Power

[SeQueNcer]

Dear Jason Marsha

You mean if i could use a higher Voltage at the same Current Rate... This is no Problem for the Motor & it Won't Be Damaged ???

what are the limits for increasing the voltage ?? or there's no limit as long as i save the rated current ?

my Motor is 5.7...1.6 Per phase ---Two Phases ...What's the Recommended Voltage to get the maximum torque ?

& is this MOtor enough to drive a machine 1.75 * 3.00 Meters runs on Chains and used in Wood Drilling ?? or i need a bigger motor ??

thanks Jason Marsha

[pminmo]

You can use voltages up to a practicle limit or 20 or 25X the coil voltage.

[SeQueNcer]

Dear pminmo,

You Are More Than a Great Person.... I'm Really glad that you are paying attention to my Thread....Thanks again

[pminmo]

You still need to limit current regardless to the max motor coil currents.

[SeQueNcer]

This is my Final Conclusion .... tell me your opinion

i'll use 110 V with 150 Ohm for each wire ...this leads to 0.73 Amp per wire.... as each phase consists of two wires.... there will be 0.73 *2 = 1.46 Amp Per Phase "Rated is 1.6"

is this correct for my Vexta 5.7 V 1.6 Amp........? i Need a High a Tourque....

if O.k.......what's the suitable Transistor which can switch 110 V with 1 Amp or more...

thanks

[CountZero]

care to reconsider the resistor thing?

Calculate how much power you will have to cool off.