DC Motor circuit help. How to keep a dc motor from rotating when no power is applied?
So above in the picture shows a simple DC motor circuit that I am building for a personal project. The load is a .6A dc motor that needs a 12v power supply. The motor currently in the shape shown above works great when power is supplied but there is a problem when power is disconnect. Project background: I am designing a project that uses 2 motors, each separated about 10 yards apart from each other. These motors rotate (one at a time) a reel that holds a line of string and that string is attached to a weight load that consist of maximum 1.5lbs and is propelled about 10ft in the air. In simple terms: I push a NO button, connects the circuit that drive a motor, that motor spins a reel, that pulls a weight that is 10ft in the air (the motor is near ground and is attached to a 10ft pole) either forward or backwards. My problem: When power is released, the weight falls to the ground due to the forces of gravity. My solution: I designed the scheme above in hopes that dynamic braking (i believe thats the term) will beat out gravity and keep my load resting at 10ft. It currently does not. My understanding of this circuit: The motor acts as a generator and therefore puts up resistance. My question: Is there any other way i can add resistor(s) to this scheme and therefore have a larger load when power is released and motor is back to acting like generator and therefore will not rotate due to not enough force being applied? Thank you for any responses!
What is actually happening when people say, "The car's engine won't turn over?"
When you turn the key (or push a button) to start a car, the battery sends electricity to the starter motor, which "turns the engine". Simultaneously, the fuel system is supplying fuel and the ignition system is supplying a spark to the cylinders, which will ignite and the engine will start running on internal combustion--instead of the starter motor. This "turning the engine" is literally the turning of the crankshaft, which (by extension) moves the pistons up and down, turns a cam shaft (or several) and opens and closes valves etc. Thus the term, the engine "turning over" means that the internal reciprocating parts of the engine are moving.To say the engine "won't turn over" implies that the crankshaft isn't turning and by (literal) extension, the pistons aren't moving up and down, the valves aren't opening and shutting etc. The internal reciprocating parts of the engine are not moving. USAGE: Generally I've used this term to describe the problem or ask this question of someone who is describing to me the symptoms of a car that won't start . To me, if they say yes to the question, "will the engine turn over ?" It means that the battery has enough "juice" to turn the starter motor, which is "turning the engine over"...but it won't start and run on it's own. This narrows down the possible problems to a probable lack of fuel or spark.Conversely, if they answer, "no" the engine isn't turning over...then the first suspect is a dead or weak battery that doesn't have enough power to turn the starter and the engine. It could be other things, but from a probability standpoint the battery is the first "suspect" if the engine "won't turn over". Another usage of the term is just to refer to a running engine. Someone might say, "That v12 runs so smooth, you can't hear it turning over." This term is still applicable to modern engines.
What happens if a moving car is put in neutral?
If a moving car is put in neutral, then the transmission from the Engine does not reach the differential and hence no power is transmitted to the wheels. This switching action will result in a slow retardation of your car. This retardation is based upon following factors:Form FactorForm factor of a car is the aerodynamic shape of the car’s body. The more this shape is fluent. The longer the car takes to come down at rest. for eg: A SUV will stop faster than that of a hatchback.SpeedSpeed of car is definitely a major factor in retardation. More is the speed, more time it takes to come down to rest.Running LoadRunning Load is the overall load a car is carrying. More is the load, lesser time it takes to come down to rest.Road ConditionRoad condition is the elevation and surface profile of the road which is highly important retardation factor that has to be considered.PRO TIP: If your brakes fail suddenly. Never swith of your engine. Just switch the car to neutral and try to toggle between the lanes safely with full control on your steering wheel. Better to get into extreme lane ( extreme left lane for India and similar road format countries and extreme right lane for US and similar road format countries).NEVER EVER APPLY HAND BRAKES FOR SPEEDS ABOVE 20–25 Kmph. for the safer side. Applying hand brakes would result in wobbling or twisting and turning of your car upside down.’VERY DANGEROUS’.
What happens when the shaft of a motor is manually rotated in the same direction as when it is turned on?
If it is mechanically driven, it will act as a generator, producing a voltage.Whether that’s a problem or not depends on where the voltage ‘goes’. If it’s just an open-circuit, nothing will happen, the motor will turn freely and while there will be some drag on the car, it won’t be much.If the driving circuit has ‘freewheel’ diodes, then current might flow back through those diodes and end up somewhere, like charging the battery in a regenerative braking circuit. That current will absorb power from the motor and cause significant drag.If the motor is switched in such a way that it is short circuited when ‘off’, then it will create massive drag, and pretty much stop the car.If you want the car to roll down the hill as friction-free as possible, it will be better to mechanically disengage the motor altogether if you can.
How do I make one motor move two wheels (without the use of an axle)?
I am trying to get a 4 wheeled device to move using rear wheel drive. I want to do this, however, without incorporating an axle that connects the two wheels to the motor. The back wheels cant have an axle because that space is meant for the feet, think motorized baby stroller. Everything i've seen online uses an axle-like device to move the wheels, but I dont have that luxury. Any suggestions? Pictures or websites that may have them would be much appreciated!
How does an engine move the wheels of a car?
Most engines have a number of cylinders. The cylinders contain pistons. Gasoline and air, mixed, explode at the right time, pushing the pistons down. A connecting rod at the bottom of the piston turns the up-and-down motion to circular motion along a "crank shaft". The crank shaft exits at the rear of the engine, and connects to a transmission, which contains a set of gears which mostly lower the speed of the crank shaft to a speed that the wheels can use. Out the back of the transmission, the reduced cranking speed connects to a drive shaft, then (for rear wheel drive cars) to a differential joint, which takes the power from the crank shaft, and sends it on to the wheels. For a solid explanation of all this, go to the Library and check out "The Way Things Work".
If we turn a motor, will it generate electricity?
Most of them do but some don’t. The most basic DC motor, found in toys such as RC cars, are also great generators. In some gasoline motors the starter DC motor is also used as a generator when the gas motor is running. All electric motors are energy conversion machines which should work as generators too however in some situations the motor can’t produce electricity. For example, some AC motors lack field excitation which magnetizes their coils, a necessary step in producing electricity. Therefore if you turn a ceiling fan motor you’ll not get electricity.On the lighter and brighter side, demonstrating a motor acting as generator is cool. You can take a toy’s motor/gearbox combo and connect the leads to LEDs connected back to back i.e. one LED is connected in parallel at opposite polarity and as you turn this generator one LED will light in one direction and the other one when the generator turns in the opposite direction.
Is a worm drive/electric motor forward moving only or can it go reverse as well?
Now the question seems little ambiguous. So I'll deal with both the concepts individually. Hope this solves your query.Worm gear drive? What's that?Work gear drive consists of worm gear (few call it worm wheel) and worm shaft.Now work drive is friction based and self locking. Meaning you rotate the worm shaft say clockwise, the worm wheel will rotate forward, and vice versa, but you cannot do the opposite meaning, you cannot rotate the worm wheel and make the shaft rotate in one particular direction.Reason: This drive is friction based drive and not positive drive. Self locking condition is when friction angle is more than the helix angle. Now how to visualise this.Now the helix angle is theta, and friction angle is tan inverse of coefficient of friction of the given surface. So for downhill motion to be not possible, this Friction angle should be more, and the slope should be less steep i.e theta should be smaller than friction angle.This happens in worm drive and hence self locking. But you have all the freedom to rotate the worm shaft in any direction as it is the driving force.Now when worm drive coupled with motor, i.e the motor shaft coupled with worm shaft then as AC motor can be rotated in any direction, the worm shaft which is coupled to it can be rotated in any direction as per the need.
Does the input shaft turn iwhile the car is in neutral?
What a bunch of crap. The input gear is geared to the counter shaft and will always turn with it, the counter shaft is where all the other gears are except direct drive which locks the input to the output but the counter shaft is still being turned. If the counter shaft didn't turn the oil would never be thrown around and you would burn up the input bearing by just letting it idle for a hour or two. If you had a bad harmonic balancer it would not vibrate all the time only at certain RPM's. If you have a vibration all the time it well could be the flywheel but I doubt it, maybe the clutch pressure plate and or disc. Where do these people get there ideas?
How do i oil an air-conditioner electric fan motor that's hard to turn by hand?
It was sitting for a long time and it just buzzed when i turned it on, the fan wasn't moving so i thought maybe debris from a very messy tree was caught up in it so i took it apart. Once open I didn't really find debris but it took me some decent effort to get the motor fan blades to move. after forcing them and then turning them by hand they got easier and easier to turn. i had the air-con running find for 2 weeks and then i left for the weekend. dad turned off my air-con and when i started it up again it only ran for 3 hours and slowly just stopped on me and before i wrestle the 100 pound beast out of the window and undo the 40 odd screws holding the case on. what can i do to the electric motor to keep it turning freely without having to open it every time my dad turns off my air-con?