Model Boat Mayhem

Technical, Techniques, Hints, and Tips => The "Black Arts!" ( Electrics & Electronics ) => Topic started by: daveorgan on November 23, 2011, 01:04:53 pm

Title: help with 12 pole motor and esc
Post by: daveorgan on November 23, 2011, 01:04:53 pm

please can someone advise me of what speed controllers to use with a 12v 900 12pole motor ive been told not all can be used
i know about the action p94
will the tornado 50amp speed controller be ok? or can you recommend any ?

thanks for your help

Title: Re: help with 12 pole motor and esc
Post by: daveorgan on November 23, 2011, 01:28:22 pm

forgot to say  this is a brushed motor
thanks

Title: Re: help with 12 pole motor and esc
Post by: tugboyben on November 23, 2011, 04:30:14 pm

Hi dave
I use electroize 15amp ESC'S in my tug that is fitted with the same motor's
On 70mm 4blade kort prop's had no problem's & the tug is used for towing

http://www.electronize.co.uk/model_electronics_frames.htm (http://www.electronize.co.uk/model_electronics_frames.htm)

Hope it help's jason

Title: Re: help with 12 pole motor and esc
Post by: daveorgan on November 23, 2011, 04:41:05 pm

thanks mate i ws thinking of them but unsure :-))

Title: Re: help with 12 pole motor and esc
Post by: Subculture on November 23, 2011, 04:53:41 pm

You can't go wrong with one of these- http://microgyros.com/speed-control-setup.html

Title: Re: help with 12 pole motor and esc
Post by: roycv on November 23, 2011, 05:23:12 pm

Hi Daveorgan, with brushed motors it does not really matter how many poles the armature has, anything from 3 poles upwards will self start and that is all that is required.

The simplest of ESC's pulse the motor at low to near top speed at a frequency of about 50 times per second.  It gets this from the transmitter and it is the 'frame rate' for controlling the servos.  More expensive ones may have their own internal frequency generator for pulsing the motor at all but full speed.  At full speed it is nice to get current directly from the battery, i.e. not using the output transistors at all.
I had an old ESC that switched the ESC out of circuit using a by-pass relay so there were no losses through the ESC.

Don't know what happens now though, any info anyone?
 
regards Roy

Title: Re: help with 12 pole motor and esc
Post by: daveorgan on November 23, 2011, 05:27:51 pm

thanks for your help i just read up on some speed controllers and they said up to 10 pole so thanks for your input  :-))

Title: Re: help with 12 pole motor and esc
Post by: Subculture on November 23, 2011, 05:29:28 pm

The more poles the motor has, the lower speed it can turn smoothly.

Not all ESC's will go up to 12 volt though, that's where you need to be careful, plus ensuring you have the correct current rating.

Title: Re: help with 12 pole motor and esc
Post by: daveorgan on November 23, 2011, 05:34:11 pm

my motors been tested and the {:-{ max i can get them to draw is 8 amps i was going for 20amp speed controller with a 15amp in line fuse

Title: Re: help with 12 pole motor and esc
Post by: HS93 (RIP) on November 23, 2011, 07:40:28 pm

Quote from: tugboyben on November 23, 2011, 04:30:14 pm

Hi dave
I use electroize 15amp ESC'S in my tug that is fitted with the same motor's
On 70mm 4blade kort prop's had no problem's & the tug is used for towing

http://www.electronize.co.uk/model_electronics_frames.htm (http://www.electronize.co.uk/model_electronics_frames.htm)

Hope it help's jason

red181 uses one in his Orca with a 12 pole Buler motor runs all day and stays cool , he tried lots of other set ups first this is on 12v  http://www.youtube.com/user/pmdevlin1#p/u/9/ZmEngFE3EKg  smoke is not from the motor, well sorted boat.

Peter

Title: Re: help with 12 pole motor and esc
Post by: malcolmfrary on November 24, 2011, 10:18:19 am

Quote from: daveorgan on November 23, 2011, 05:34:11 pm

my motors been tested and the {:-{ max i can get them to draw is 8 amps i was going for 20amp speed controller with a 15amp in line fuse

If the most that the motor will pull is 8A then the 20A ESC will be fine.  It just means that you are not going to kill the ESC.  Close matching was only vital with mechanical ESCs, but with PWM types, what will handle a lot, will handle a little.