Electronic Circuits and Projects Forum

Thanks,

I've checked before some Hall sensors datasheets, und i checked the allegro application notes, but i still can't figure it out.

Concidering it's have 3 hall sensors then we'll have 1 Gnd and 1 Vcc and 3 output wires wich gives 5, then what's the role of the 6th, unless it have 4 sensors, but what's the 4th role ???

We could admit it had 4, but how could i guess the Vcc and Gnd ? or should i reverse engeener it, I was unable to open the case then remains the bruteforce solution, I guess most of the Hall sensors starts operating at 3V then i could try powering it with 3.7V and checking the outputs, but this requires lot of tries, unless I'll be lucky and find the power wires from the first tries yet must try with the right polarity.

What would you do in a similar situation ???

Originally Posted by mindoverflow

I opend it, almost damaged (damaged a bearing maybe 2 and a bit at the coupling point of the shaft) but the good news is that i solved the problem.

The wires are connected as follows:

KOKUSAN DENKI FH7-1561 TL0146

Red Phase A
White Phase B
Blue Phase C

Green Hall A
Gray Hall B
Orange Hall C

Black Gnd
Yellow Vcc

Brown I'm not sure yet, it comes from an output from a C358C amplifier (can't take the PCB away, and don't want to cause extra damage). Here begins my questions I doubt about a part marked as "04S" looks like a mini photo switch, but both sides pointing up and kind of having a resin on top instead of acrilic pointing to an encoding washer stuck to the surrounding magnet (then i'm not sure if it's a kind of hall sensor or similar, or it's a photo switch the washer is chrome then reflecting) I don't have a camera here, i would had included photos.

Then, if i'm right the 3 hall chanels outputs are enought to control it as a servo, then what is the purpose of that extra sensor ???

I hope that post will save time to someone in the future.

tschüss

Hello mindoverflow, thanks for the info, i have one very similar to yours as label says:

DC BRUSHLESS SERVO MOTOR
FH7-1594 TLO148 (or TL0148... not sure)
D.C.V 24
KOKUSAN DENKI Co.,Ltd
MADE IN JAPAN
MFG. LOT NO. 3N04

... It has a fat 9 pin connector with the same colors as yours, being red, white and blue, bolder cables than the rest (of course for higher amperaje)
you saved me the destruction part, as they have no bolts to unscrew, so the only option is caveman method.
It's a quite heavy motor about 1 Kg.
Have you made it work?
Any commercial controller or you made it your own??
Any pic or video would be awesome...
well, thanks anyways, the most important you already helped me

regards
Rodrigo

Hi,

I'm happy for you. Opening it is easy the cover is maybe glued or simply tight, then hitting it with the tip or a screw driver from the side of the shaft will loosen it, then remains only the shaft clip and it comes by it self (the magnet is strong enough to hold it in place).
I almost damaged the shaft because the pulley wouldn't come out then i used an angle grinder to cut it.

I thought i posted some photos, but maybe i did it elsewhere here are some recent ones.

Yes the motor works. I used my own designed circuit, all you need is a µC and a triple h-bridge. you can add a schmitt triger or comparator or what ever, but those 2 components are all you need.
You can use the microchip app note for bldc motor control (or any sensored bldc control circuit on internet) replacing their chip with the one you have anyone will do the job, you need 6 outputs and 3 inputs + what you need for your application.

Something else, the hall sensors are rated at 12v if i remember well will function at 8-9v but won't give any output at 5v. Check the datasheet.

May I ask you from where did you scavenge it, or did you buy it as is?

Good luck.

hi mindoverflow,
thanx for your fast response.
Those beautifull photos gave me a nice surprise.
Did you notice the optical encoder?
Photos 4 and 5 show the encoder's "disc" with the little holes, and
Photo 2 shows the encoder's optical sensor (that you called "mini photo switch" as "04S")... at least it looks like that. So now you have encoder feedback to make easyer your motor control as a real servomotor.
It must be considered that to sense direction, encoder musts have at least two outputs (quadrature output), so maybe that sensor is double output.
Then the problem would be the need of extra cable for encoder output, and I think they those two "suspicious" cables you mentioned in the first post of this thread, but I can't see in your photos.
I was cool with the information you posted previously, but these photos tempted me to open mine to check that about the optical encoder.

I have two of these motors, they are identical. I got them as guts from an old copy machine for USD $5 (2,5 each) (hehe I was really lucky).
Yes I know a bit about the electronics stuff in fact I have a set of PIC18F2431 with QEI interface (dedicated hardware peripheral inside the microcontroller to decode quadrature encoders) and 6 advanced 14-bit PWM channels dedicated for motor control. PID tuning is my goal at this moment, but my real goal now will be to run these KOKUSAN servomotors.

I'll get a camera to send you some pics soon.

Regards, write you soon!