
Dunning-Kruger
Hey Tony,
Just got those Bosch servos... thank you so much... Can I ask one more favour? What are the pin outs on these?... There appears to be 5 pins with a recessed sixth... I assume 2 are for a 12V battery and the others are used to drive the motor... Just don't know which one is which...
Thanks
Richard
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Open it. The 2 powers the motor and the 3 pins go to the pot
the wiper is the middle pin of the pot so it goes V+, Signal, Ground.
As far as the 2 pins yes you need an hbridge to get PWM and direction
I had this saved for bosch, but the spec page will not display.
This is the closest I can find till Tony responds. Post 276
http://www.ez-robot.com/Community/Forum/Thread?threadId=2263&page=28
Steve S
@Steve S Thanks, I will have a look....
I think the pot only controls 100 degrees.
Steve S
I finally found this.
DAVES POST #313 First real look...
"I hope you can use these motors. Although I cant use them to lift my heavy 8 pound B9 arms I still think they are good little motors. I think they can be used in a lot of tight places to move loads up to what I show below. Also I think they would be great in lighter robot arms in smaller robots. Smaller then my full sized B9 anyway.
Here's what I've found in testing them:
The pot inside only reads for 100 degrees of the rotation. Attach an ADC port's signal pin from EZB to the center pin of the lower set of three pins on the motor and 5v & GR pins to the two outside pins. Install a ADC control in EZ Builber and assign it the the ACD port you have the motor's pot attached to. When the motor rotates, the ADC control in ARC will move from Zero to 5v as the motor rotates within that 100 degree ark. When the motor passes outside of that zone the ADC Control will fall to Zero till the shaft come back around to the start of where the pot starts to read the 100 degree ark again.
If you remove the actuaitor arm from the shaft by carfully cutting it free with a Drummel or hacksaw the shaft will continully rotate.
The motor runs fine on 24vdc although it's only rated up to 12vdc. The two pins side by side on top of the three used for the pot are the power pins. I ran it for 6 hours with no load at this voltage. I never ran it for any leangth of time under load at this voltage. The higher the voltage is the stronger and faster it will run. With the motors doubled up I was able to lift a 3lb load 12" out from the shaft at 24vdc. I could lift nothing at 12vdc. I did not test lifting with only one motor but I'd guess the proformance is cut in half. It will hold a load without creaping down when power is cut.
The motor runs almost silent but does vibrate and hum a little when it moves under load. The noise is louder if you have it attached directly to a surface without useing it's attachment holes. These attachment holes have rubber inserts and if used with #8 machine screws absord moat all noise and vibration."
Cheers
Richard
Dave
The top three pins are the pot - the lower two are the (12v) motor.
To use as a servo here are some options
1) Use an H bridge and read read the pot via an ADC port
2) Use a Kangaroo/Sabertooth combo - this would allow control of 2 Bosch units
3) This would probably do the job https://www.pololu.com/product/1373
I have designed a custom board and PIC for these units but I only did a small run of the boards and need them all for my beta test robots.
Here is how I mechanically use them, first I carefully cut off the actuator arm with an hacksaw blade to reveal a nice 6mm spindle which fits all the 6mm hubs like https://www.pololu.com/product/1999
Here is a photo of the arm joints. The Bosch motors in the biceps are inside the white enclosure all other units are visible
.
Here is a link to one supplier of the Bosch servos
http://www.ebay.co.uk/itm/BOSCH-12-VOLT-VARIABLE-SERVO-100-MOVEMENT-GEARED-NEW-/380343639810
Tony
Thanks again
Richard
I must admit I am not a robot maker, I am interested in the use of the Bosch VMC motor that are being used in your projects. I am a auto electrician in the UK, the Bosch VMC are used in a variety of applications on a number of Cars and Trucks (heating and ventilation valves, flap controls, headlight adjusters, etc) , the motors are available as 12 or 24 volt DC, Bosch part numbers :- 0 132 801 141 = 24 volt; 0 132 801 142 = 12 volt.
I am interested in how you control the motors in your applications ? I am currently attempting to use the VMC motors in a application to control water valves, I cannot find a control unit that will control the motor position using the internal potentiometer for position reference.
Can anyone suggest a controller that will work from a 24v dc supply ?
Thanks
Keith