RC India

 
  need a 550 size johnson motor ...    :help:

does any one know where we can get those ... ?

any one having in spare & willing to sell ... ?

Can you post an indicative pic? And required power? I may have some laying around..

  similar to these  used by VC sir ....

does any one know where to get those .. ??  :banghead:

I have got them but the shipping cost will be more than the motor's price :P Look in the toy motor section of vegarobokit or dc motor section of either nexrobotics or other online roboshops. This motor is quite common. Another option is to browse your local electronics market(every major city has one of those :P) where all your city's electronic junk(old printers, junked pcs ) go. I got some great motors(mabuchi, jhonson, pittman, japan servo to name a few) from my local market for less than 100 bucks apiece :P Best of luck!

can you see if u have  any one with these specs .... that i'm in need  :hatsoff:


Johnson:

Can dia: 40mm
Can length : 65mm
weight 180 gm

all this is only for motor . no gear assembly and all ......


(Pic  from  VC sir's  hover craft  ...)

Ajith, I am expecting some royalty from you for using my photographs and their edited versions! ;)

 sure  VC sir ....
      i will name my hovercraft after  you  :bow:
          you are  inspiring us for a lot of things .....

but  first  i need to get the motor ....  :banghead: :banghead:

http://www.vegarobokit.com/index.php?route=product/product&path=35_49&product_id=169
The given product picture is wrong. The original motor has a black baseplate and heavy duty carbon brushes. If you want I can upload the original pic. But you first need to tell me the power requirement/rpm of the motors. Maybe VC can enlighten us with the specs ;D

 thanks  lastrites ....   can you post the dimensions of the motor ? the one you have ...  :salute:

the one i'm looking for is  similar to this ....  i badly need it ...   :help:

The can length is around 5cm. Unsure about the stall current though.. more than 20A definitely.

 seems  it is not the one i'm looking for ...  :-\

contacted  some local  Electric Hard ware shopkeepers , one of the said that  he can get it  ( from some hand held vacuum cleaner manufacturer   :headscratch: :headscratch: ... ... .. ..  )                          but takes 10-12 days  and price around  550  :Rs:  not sure yet  !!   8-)

seems  i have to wait for 12 more days .....  :( :(

Did you mention the stall current of 85A? ;D

Yes,
Ia = (V - Eb) / Ra
where, Ia = Armature Current, V = Supply Voltage,
Eb = Back EMF due to rotation of armature within magnatic field.
Ra = Armature Resistance (In detail, it incorporate brush contact resistance.

Now, At blocked rotor/armature condition, Eb = 0 and current become maximun, and that is stall current.

It is a parameter only but it cannot be withstand by armature winding / brash commutator contact for long and burnt will occure (That is why brushless comes).

You will find this motor inside printer (HP610, 640, 670C, 810, 840, 930) for carrage movement motor with gear train. Similar motor (Except high power) you will find in Xerox machine. Just search, where second-hand defective machines are desmantelled (Like wellington area of Chandni Chawck) of our Kolkata. You need inly the set up of grars withen a gear box.

Good luck.