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How 2 electric motors work together, wheel in air spins on princess carriage

Posted: Sat Jan 26, 2019 11:11 am
by New John
If 2 electric motors are running off the same power source and you load one motor up more than the other, will more power transfer to the motor with less load on it ?
To clarify some, my daughter has a 24v Disney princess carriage, stock. Both back wheels have their own motor/gearbox assembley. When she drives it, if one wheel gets in the air, it spins and the other one doesn’t. Almost like it has a differential of some sort but it obviously doesn’t. I don’t know if the motors are wired in parallel or series, or what’s typical or what difference that makes. All of this just makes me wonder if one motor is stealing power from the other motor when one of them is able to turn more freely. Is that possible? Sorry I’m not up on dc motor theory. The company sent me 2 new motor assemblies but I haven’t replaced them yet. If what I’m saying isn’t possible then what is most likely the problem, or is there a way to make it a true 2 wheel drive so it doesn’t get stuck all the time?
Thanks everybody

Re: How 2 electric motors work together, wheel in air spins on princess carriage

Posted: Sat Jan 26, 2019 1:30 pm
by M.L.Toys
Sounds like it is working properly. That's how motors work when wired in series. Nothing you can do to change that.

Re: How 2 electric motors work together, wheel in air spins on princess carriage

Posted: Sun Jan 27, 2019 12:47 am
by New John
Thank you for letting me know it’s working properly, I don’t have to waste my time replacing motor assemblies that are just fine. But I might spend time on it doing other things. The batteries need replacing.
I know you said there’s nothing I can do but I have to ask lol, If I were to change the wiring to be in parallel, then each motor would get too much voltage, right? (I’m thinking in series the 24volts gets divided across the 2 and that the motors are probably 12v motors.) So what if I changed the batteries or added some sort of voltage reducer or even added or changed a motor controller? I guess my questions boil down to:

1) if I figured a way to make them work in parallel, would one tire still spin when it’s in the air or would that problem be solved?

2) if that problem would be solved, what’s the best way to go about getting them to work in parallel?

3) now instead of the voltage being split, wouldn’t the current be split? Although I didn’t think the power source determined the current except for a max rating, and that each device in a circuit would draw whatever current it needed.
Anyways, if the current is split, will that reduce the speed?

Again, thank you for your help.

Re: How 2 electric motors work together, wheel in air spins on princess carriage

Posted: Sun Jan 27, 2019 3:48 pm
by Jasonownsansw20
I would think a 24 to 12v reducer would be your safer option to then run the motors in parallel but I'm no expert.

Re: How 2 electric motors work together, wheel in air spins on princess carriage

Posted: Wed Jan 30, 2019 7:33 am
by Hammer-fm
You're generally correct -- in the current configuration it will be 12V per motor when they're both on the ground. The reason you get the 'open differential' effect when one wheel is off the ground is that the current needed to spin up the in-air wheel is much smaller than the one on the ground and it will build up enough RPMs to use all of the voltage (via. back-EMF). So if you had actually measured the voltage across the motors in that configuration you'd see ~24V on one motor and ~0 on the other one.

If you rewire them so they are in parallel, that 'open differential' behavior would disappear since both motors are forced to have 12V on them. But you'd have other effects:
(A) The top speed would be 2x
(B) Peak torque on each gearbox will be 2x
(B) The peak current load at the switch/battery would be 4x (!) vs. your current configuration

And depending on how well-built components are, that could lead to breakage or switch failure pretty quickly. Wiring it for 12V in parallel would give you the same speed and torque as your current setup but remove the open-differential problem. Note that even at 12V it would still use 2x the current, which could be a problem. I don't know why they went with a 24V-series configuration other than that it can be run with wimpier wire.

Re: How 2 electric motors work together, wheel in air spins on princess carriage

Posted: Wed Sep 04, 2019 5:29 am
by jasonfoy123
A 3-section, four-pole induction motor is manufactured from two predominant parts: a stator and a rotor. The stator is made of 3 components: a stator middle, conducting wire, and body. The stator middle is a collection of steel jewelry which might be insulated from one another after which laminated collectively.
These earrings consist of slots on their internal that the accomplishing twine will wrap round to form the stator coils. Simply positioned, in a three-section induction motor, there are 3 exclusive twine kinds. You can call those cord types Phase 1, Phase 2, and Phase 3.
Each twine kind is wrapped across the slots on opposite aspects of the inner of the stator center. Once the accomplishing wire is in place in the stator middle, the center is located inside the frame.
How does an electric powered motor work?

Because of the complexity of the topic, the following is a simplified rationalization of the way a 4-pole, three-section AC induction motor works in a vehicle. It starts with the battery inside the vehicle that is connected to the motor. Electrical power is provided to the stator thru the car’s battery. The coils in the stator (made from the engaging in twine) are arranged on opposite sides of the stator middle and act as magnets, in a manner. Therefore, when the electric strength from the car battery is provided to the motor, the coils create rotating, magnetic fields that pull the carrying out rods on the outdoor of the rotor alongside at the back of it. The spinning rotor is what creates the mechanical energy wished to turn the gears of the car, which, in flip, rotate the tires. Now in a typical vehicle, i.E., non-electric powered, there is each an engine and an alternator. The battery powers the engine, which powers the gears and wheels. The rotation of the wheels is what then powers the alternator inside the vehicle and the alternator recharges the battery. This is why you are told to power your automobile around for a period after being jumped: the battery needs to be recharged in an effort to characteristic correctly. There is not any alternator in an electric car.
So, how does the battery recharge then? While there may be no separate alternator, the motor in an electric powered vehicle acts as both motor and alternator.
Electric motor-voltage
The time period alternating current defines a form of energy characterized by way of voltage and modern that varies with appreciate to time.

This is due to the alternating nature of the AC sign that lets in the voltage to be easily stepped up or stepped all the way down to distinctive values.That’s one of the reasons why electric powered automobiles are so particular.
As referenced above, the battery starts offevolved the motor, which resources power to the gears, which rotates the tires. This procedure happens whilst your foot is at the accelerator — the rotor is pulled alongside by way of the rotating magnetic field, requiring extra torque. But what takes place when you allow off of the accelerator? When your foot comes off the accelerator the rotating magnetic area stops and the rotor starts spinning faster (as opposed to being pulled alongside by the magnetic subject). When the rotor spins faster than the rotating magnetic subject within the stator, this action recharges the battery, appearing as an alternator.