Model Boat Mayhem
Technical, Techniques, Hints, and Tips => DC Motors (Brushed) and Speed Controllers => Topic started by: lakeshore on September 20, 2014, 11:05:56 am
-
Hi there
thinking of using a car blower motor on my 36 inch motorised coal barge and wondered if anyone has or is using them ?.
Cheers
John
-
Evening John.......motor vehicle fan motors :-))
1. huge torque
2. low RPM
3. low current draw
On such a low speed vessel.....go for it O0 ..... Derek
-
Hi Derek
thats what I was thinking but not much info about them.
-
Derek,
Not so low rpm. Usually about 5000 rpm but as you say huge torque so can swing quite a large prop at that speed!!
Bob
-
Evening Bob..........
1. some 30 years ago I used 12 volt motor vehicle ventilation motor on 6 volts in a model ship application......
2. the output speed was ~~ 2200 RPM unloaded with a current draw of 0.4 amps
3. the prop was 4" diameter x 4" pitch........and drawing 1.6 amps @ approx. 1200 RPM when under load in the pool O0
Brilliant choice of motor for a slow speed application :-))
Derek
-
Still have some Renault blower motors in some of my boats today,a good 30 years old.
Mick F
-
HI John
Superb choice, go to a local vehicle recycling centre, I have an Audi, 2 Fords and an unknown German motor, they are very powerful don't draw much power and seem to go on for ever.
Regards
Mark
-
Thank you kindly Gents all good information.
John.
-
Mk4 golf blower motors are very easy to remove and a reasonable size etc
Aid :-))
-
Forgot to mention, radiator blowers, very easy to remove
Mark
-
(http://i1169.photobucket.com/albums/r509/rustler333/BLOWERMOTOR_zps27380343.jpg)
I have this blower motor for my bangka boat
-
Just a note about radiator blower motors. They are generally much higher consumption than heater blower, and turn at lower RPM with enormous torque, as they are wound to drive a very large fan direct drive. Unless you're building a boat with a very large prop e.g. over 6", then avoid them and look for the heater blowers or a smaller motor.
-
Just had a look at a couple of heater blower motors that I have in the draw, from either ford or VW, one runs at 4464 rpm and the other at 4106 rpm, and I have one in service in a tug ( Northsider with 120mm prop, a real mean machine) that turns at 4610 rpm max. They are all very low consumption and plenty of torque and run cool. I always use fuel pipe to connect motor to prop shaft, almost silent and very efficient.
Paul.
-
Not around 2000 rpm as suggested earlier.
Bob
-
That was a 12v motor running at 6 v
I think :-)) Bob
Ned
-
The speeds referred to in my post above are with a motor running on 12v.
Paul
-
How about using the motor of a rc bump starter?
-
motor from a rc starter is a mfa 850 and runs at around 8k rpm
Dave
-
HI Subculture
Thanks for the update on radiator motors being hi drain, wasn't aware
Regards
Mark
-
Hi John.
back in the 80`s had an 8ft bread n butter hull 1/96 scale WWII Ark Royal which would run all day on a fan motor.
Frank
(http://i271.photobucket.com/albums/jj138/farticus1/img983_zps70530d4c.jpg)
(http://i271.photobucket.com/albums/jj138/farticus1/scan149_zps5485939e.jpg)
-
Hi frank
Thats a huge nice looking ship
What battery were you using back then to power that fan motor?
-
Hi Seathug.
battery was large as it doubled up as ballast one of these.
Frank
http://www.leadacidbatterystore.co.uk/products/Yuasa-Battery-NP24%252d12I-24Ah-12V-SLA.html?gclid=CIejg_HjnMECFfSWtAod_B4AxQ (http://www.leadacidbatterystore.co.uk/products/Yuasa-Battery-NP24%252d12I-24Ah-12V-SLA.html?gclid=CIejg_HjnMECFfSWtAod_B4AxQ)
-
So if youre going to use ac car blower
What esc would be suitable for this motor?
-
So if youre going to use ac car blower
What esc would be suitable for this motor?
Not too sure where the ac comes from. If its from a car, it will be DC. An older car might be field wound, but anything modern is likely to be a permanent magnet motor, so any ESC that can handle the voltage and current will do the job. As a clue for current requirements, look at the car manual for the fuse rating supplying the motor. Anything higher than that will be fine.
-
Hi seathug.
The speed controller question can`t be answered at this point as there are two many unknown variables.
Eg 1. what voltage are you going to run the motor on
2. what size is the prop going to be
3. what material is the prop going to be metal or plastic
4. how many blades on the prop
5. what type of craft is the motor going to drive
6. what will the all up weight be
In the main the guys I knew that used a fan motor ran them on 12v to turn a 75-100mm three or 4 blade brass prop on a scale model
usually a tug, merchant ship, or battleship. The were no ESC`s back then so it was the ubiquitous "Bobs board" or the servo with two micro switches for fwd / astern. The motor drew @ 4- 5amps on this set up.
frank
-
Malcolm...I think your colleague from the Islands %) may be referencing ac .....as from a air conditioning fan motor
But then :embarrassed:...he has made a number of startling comments about electricity and such black magic issues {-)....... Derek
-
Could also have been a motor manufactured by ACDELCO
-
A/c air conditioning motor blower
That is the motor were talking about here am I right
-
Here at 53 degrees north, aircon is rarely considered, consisting mainly of opening the window on either of the days of summer. Car heater fan and radiator fan motors are what has been mentioned mostly. Electric window winder motors deserve a mention too.
-
there are a few other motors that could do with a mention....
the motors out of battery powered drills...
industry big printers have nice DC motors...
names that could appear on the motors.. dunkermotoren, buehlermotoren, VDO motoren.... and there are others..
-
Great I have a bunch of those power drills at the shop
Im going to try that motor
-
Hi Colin.
Over the last 30 years any device that has had a battery powered motor in it I can guarantee that some body on here has had it in a boat either for propulsion or aux function. The last non retail bought motors I aquired were Buehler photo copier motors.
Pair of them on 18v ran a 72 inch frigate all day, that was about the time decaperms hit £60 each.
Frank
-
Waste not Want not as they say.
Even the mobile phone vibrate motors
are used I believe.
Ned
-
Hello!
I am searching for info about car heater motors.
I am building a model boat (project image is my avatar) and when considering propulsion I got two used car heater motors to test. One is from Opel Astra F, produced by Siemens, which ran at 20A max when powered by the car's battery with the turbine still attached to the shaft, at about 4000 rpm. The other is from Renault 19, produced by Valeo. With the turbine and housing (a load test of a kind) it ran at 3000 rpm on 12V with 16A consumption. The Siemens motor is awfully heavy (over 1kg), while the Valeo is less than 500g. Both motors have enough grunt for any application imaginable, however I am concerned about their cooling. Every permanent magnet dc motor I have seen has a tiny turbine wheel attached to the axle, while both these motors do not. I understand that the air flow through and around them caused by their turbines has cooled the motors enough in their original places, but I am not sure how the one I choose will fare in the closed space of the hull without cooling. Could any of you with experience share some info on how you have solved this problem, or if there is a problem at all in the first place? My setup will most likely be one motor running two prop shafts with propellers about 50 mm in dia and 1,3-1,4 pitch via belt drives on a composite planning hull 1.2m long and 25cm wide.
Thank you!
-
ldv6
Don't worry about heat buildup, with the setup you are proposing i would expect your current draw to be about 4 - 6 amps, remember your original power measurements were with a large fan attached to the shaft.
If you are worried by this make a small fan and attach it to the output shaft this will circulate air round and through the motor. Be sure to mount the motor to a firm base, well attached to the hull, they have massive torque and will destroy motor mounts and prop shaft u/s's if you get into weed etc,
Hope this helps
Mark
-
Thank you Mark that was helpful. I will definitely do something about the cooling when I am closer to fitting the motor to the hull. These motors are low rpm so a shrouded fan on the axle might be just perfect without any huge ballancing issues, for my peace of mind if not for the motor %) !
Now, about the torque part - I can not possibly have a controller that can handle the stall current of such a motor at full 10 NiMH pack charged voltage, nor the battery can supply it anyway so I will be using V belts which will fortunately slip on the pulleys in case I run the boat in weed or grass or whatever. I will be trading torque for rpm for the propellers, which I expect will put more strain on the motor, so I expected currents at least twice bigger than what you stated. I hope you are right about that, though!
Thanks again!
-
ldv6
Dont panic over the stall current over coming your ESC, Add an in line fuse at say 10amps, this is below your ESC rating and will also protect your wiring.
The motor torque is getting you mixed. Torque is the turning / twisting force, Amps / watts is the power applied to the motor
Hope this helps
Mark
-
(http://i1169.photobucket.com/albums/r509/rustler333/IMG_0546_zps3888213d.jpg)
This will go to the scale bangka
Denzo brushed motor