audioguru

Also maybe you should look up how transistors and darlington transistors work.

The datasheet for the TIP110 darlington transistor and for every transistor shows a listing for its guaranteed max saturation voltage loss (Vce)at various collector currents with specified base currents. The datasheet also shows a graph of typical values. It also lists the guaranteed max Vbe at various currents and shows a graph of typical voltages.

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Uncle $crooge

uaefame

Interesting now H-bridge I was so close to select my transistor. Thanks anyway to inform me about it at an early stage i can modifiy my design now before advance further.

I know i can google it for more information about H-bridge but my question is H-bridge function like transistor is there any similarity because i send alot of time in learning about transistor.

Second question if you know a good database for selecting H-bridge please inform me.

Thanks in advance

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Hesham Ismail Mohammed Sharif
Thank me if you want

ericgibbs

hi,
You say the motor takes just over 1amp when its running, is this the current when its driving its mechanical load or just free running on the bench.
Its IMPORTANT to know the current when the motor is driving the system.

You said that the motor is 23Vdc, then you say its 48Vdc, which is it.?
Its IMPORTANT to know the operating voltage of the motor.

When you have determined these two values, then you can start choosing a Hbridge.

Also remember that the initial starting current drawn by the motor can be as much as 5 to 10 times its running current.

A final question, does the motor drive at full speed when powered or does it require variable speed control.? The Hbridge can do that, BUT it will be necessary in the PIC program to consider PWM for proportional speed control.

If the device tracks the Sun across the sky, I suspect its a variable speed motor drive.

Do you follow this OK.?

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

uaefame

Thanks ericgibbs for replying to me and I follow it quite well,

THE voltage that the motor require is 48V if you want to run it directly, if you are using energy conveter III (motor driver) which need AC power supply and you can drive the motor using sensor output terminal by supplying 23V and 1A current.

But as i said motor need 48V DC and current for a free run is 0.625A i didn't do the load test yet for the current i will do it soon.

My question is what should i consider when looking at H-bridge rather than the voltage and current is there something else i should look at it?

__________________
Hesham Ismail Mohammed Sharif
Thank me if you want

ericgibbs

hi,
Once you have determined that the motor requires to be driven in both a CCW and a CW direction and it requires that the motor needs to be driven at different rotational speeds, it will be necessary to write a PIC/MCU controller program to suit the H Bridge and motor system.

In choosing a suitable H Bridge, as already stated, you must determine.
The motor starting current, running current, stalled current and the voltage required by the motor.

If the system does not have a power supply capable of supplying these voltage/currents you will have buy or build a suitable PSU.

Does this help.?

__________________
Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/