Hmm - if you maintain a fixed voltage over two equal resistors in parallel, then you will get the expected curent (I = V/R) through each resistor. Since the (equal) resistors are in parallel, the total effective resistance is halved, and current drain from the battery will double.
I agree with this, but presume I would have double the torque to push my boat as well, same RPM(same voltage)
My concern is if the resistance is marginally different and they are parallel, would one get more current and fight the other.
If so this would not be good.
Has anyone actually used a parallel motor arrangement with one controller?
one again, thanks for everyone's input.
From: "boat_works@yahoo.com" <boat_works@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Thursday, October 3, 2013 8:55:12 PM
Subject: [Electric Boats] RE: RE: Re: using dual DC motors with one controller
---In electricboats@yahoogroups.com, <electricboats@yahoogroups.com> wrote:
---In electricboats@yahoogroups.com, <electricboats@yahoogroups.com> wrote:
I agree with this, but presume I would have double the torque to push my boat as well, same RPM(same voltage)
My concern is if the resistance is marginally different and they are parallel, would one get more current and fight the other.
If so this would not be good.
Has anyone actually used a parallel motor arrangement with one controller?
one again, thanks for everyone's input.
From: "boat_works@yahoo.com" <boat_works@yahoo.com>
To: electricboats@yahoogroups.com
Sent: Thursday, October 3, 2013 8:55:12 PM
Subject: [Electric Boats] RE: RE: Re: using dual DC motors with one controller
Dimon wrote:
"If they are in series, the voltage at each resistor is half, so therefore the current will also be half in each motor."
Not quite correct.
Yes, half the current is flowing, but all that current is flowing through each motor.
Mr. Kirchhoff would say something like "All the current entering a node leaves that node.".
I'm sure that's what you meant.
-Tom
---In electricboats@yahoogroups.com, <electricboats@yahoogroups.com> wrote:
Hmm - if you maintain a fixed voltage over two equal resistors in parallel, then you will get the expected curent (I = V/R) through each resistor. Since the (equal) resistors are in parallel, the total effective resistance is halved, and current drain from the battery will double.
Basically you will need a controller (and batteries) capable of handling twice the current flow typical of one motor.
If they are in series, the voltage at each resistor is half, so therefore the current will also be half in each motor. Mounting resistors in series doubles the overall resistance, so the overall current will be halved.
If you want a simple analogy, imagine a water flow, and each motor is a pipe of similar diameter. If you have two pipes in parallel to channel the water, the water will flow twice as fast. If on the other hand, the pipes are in series, then the drag on the water flow will be greater than through one length of pipe by itself.
---In electricboats@yahoogroups.com, <electricboats@yahoogroups.com> wrote:
If you connect the motors in parallel they will share the current, if you have a 200 amp controller each motor will see 100 amps and full voltage. if you connect is series each motor will see all the current, 200 amps but split the voltage, so in a pm motor it would spin at 1/2 speed or you could double the voltage to get full speed back. In some cases 1/2 speed might be okay for your application. so one controller might work for you!
Brian D. HAll
| ThunderStruck Motors, LLC 2985 Dutton Ave. Ste 3 Santa Rosa, CA 95407 Tel: (707) 578-7973 Fax: (707) 581-1860 |
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