You question does not say what size DC motor you are wanting to control, so this answer will have to be generic.
First of all, you DON'T drop the voltage "OF" the DC motor, you drop the voltage "TO" the motor.
The simple answer is to place a "RESISTANCE," or "RESISTOR" in series with the motor. A resistor limits the amount of current flowing through it, and thus the voltage.
If you are talking about the very small DC hobby type motors [designed for 1 to 3 volt inputs], one way would be to use a variable resistor, like a large potentiometer ["pot"], scavanged out of a discarded "old" TV or "old" radio [both "pre" solid state era].
Another trick I've used [requires a lot of trial and error] is to use an assortment of old [but working] incandescent/filiment type light bulbs [small, like from flashlights, Christmas tree bulbs, dial lights from "old" radios and TVs, etc.] as resistors.
You can experiment around with "stacking" these in series to add more resistance, with each addition slowing the motor more. And if even the largest of them slows the motor TOO MUCH, then they can be wired in PARALLEL to decrease resistance, allowing more current flow. As said above, this can require much trial and error, but it can be made to work.
Another method [if using batteries] would be to use fewer batteries in series. This only works for larger voltage motors, like out of 24/18/12/9/7.2 volt motors [like out of cordless drills for example].
As an example, consider using an 18 volt motor. To provide the "normal" 18 volts would require 12 1.5 volt alkaline batteries in series. If you used only 6 batteries, you would have reduced the voltage by half. By varying the number of batteries, you would be able to vary the motor speed. Remember however, that there is a limit to how much you can "starve" the motor and still have it run or do any work.
If your aplication allows you to use an AC power source, then another method [much more expensive] would be to use a benchtop AC powered, variable power supply.Answer
Another common method is pulse width modulation (PWM). The full available voltage is switched on and short time later it is turned off again. This cycle repeats continuously at a relatively high frequency (hundreds, to tens of thousands of times per second). The ratio of the on-time to the off-time determines the apparent percentage of the DC supply that the motor sees.
The circuits to drive motors this way can be relatively simple to extremely complex, depending on the size of the motor, available DC voltage, and other controls needed (such as controlling speed instead of voltage supplied to the motor).
ANSWER: motor are not voltage related but rather power related so the answer is not to reduce the voltage but to reduce the power going to it. REDUCE THE POWER WILL REDUCE THE SPEED. either reducing current and /or voltage will do the trick.
Install a rheostat in series with the motor.
bad voltage krunkbobulator
Depends on what sort of motor it was. If it was the sort you find in an ordinary electric drill, then it would slow down. But rememer, the only way you can reasonably reduce the current in to motor is to reduce the voltage in the supply. A motor takes what current it can, dependent on Ohm's Law. To reduce the current, reduce the voltage. But in a three-phase motor, the speed being dependent on the rotation of the phases, it would more or less stay the same. But this assumes it's not under load. A load would cause it to slow down.
Motor speed can be controlled by either voltage or frequency. A transformer to change the typical 120 VAC down to a lower voltage would slow a motor for a constant load. Motors should be matched well to their load torque. Changing frequency is more complicated and for this simple discussion will be avoided.
slow down my saliva~
Assuming the sine wave's angular frequency is what's changing, the motor will speed up and slow down in proportion to that frequency.
It really depends, but i drop mine and now its really slow. I also drop one down the toilet and it doesn't work at all
The blower motor is tired. It will eventually blow a fuse and/or burn out the blower motor speed resistor. Time to replace the blower motor. Also check connections for high resistance damage (melted connections).
No, electricity will not slow down with increased resistance. The number of electrons moving through a conductor will decrease with increased resistance. Also there will be a drop in the voltage (electrical pressure) with increased resistance. Look up Ohms Law for formulas relating to voltage, resistance, and amplitude. E=I*R. E=voltage (pressure), I=the current (flow of electrons) R=the amount of resistance or the strength of the opposing flow of electrons. The speed of an electron through a conduvtor will always remain the same.
Homes should have circuit breakers so that you can slow down voltage in electronics.
it depends on how fast you pour a liquid eg: your puring a glass of water down the sink and you pure it drop drop by drop that is slow or your puring lots down at once. basicaly it depends on how fast you are puring
The molecules of the gas will slowly start to slow down, causing a drop in temperature.
slow down when you are behind them and driving past them and then carry on as normal but don't be to slow or they get spooky (mine does anyway lol) :)
Replace the slow headlight motor.
high gas prices !! that will slow you down
Sit very still and hold your breath! I can drop mine by half in 40 seconds.
A generator's terminal voltage can be raised by increasing the field current. This will result in an increased load on the generator, which will slow it down unless the governor kicks in to keep the generator at speed.
DC Motor Specifications: 1.RPM 2.No-heap Speed 3.Slow down Torque 4.Most extreme Current
I think you mean slow down and speed up. slow down =slow, speed up=fast
It will bounce up ,then down due to gravity. It will keep going through this cycle untill friction will slow it down the eventually stop it
It depends is your computer already slow prob. If is not slow it's probably not going to slow down but it will not slow down the internet
how slow is too slow? speed is a matter of perspective. Drop that bytch
cars slow down because of friction and when you push the brake pedal you automatically slow down
The speed of an electric motor is directly proportional to the frequency of supply. The rpm written on the name plate is the maximum operating speed for the motor design. Typically, for a squirrel cage induction motors, the speed is constant by design and this type of motor cannot operate for a long time at speeds below the rated value. It is true that loading affects motor speed to some extend but the electric motor will accelerate to the rated speed. If the loading is within the design parameters of the motor, the electric motor speed will not drop. What typically happens is that if the loading increases, the speed goes down, and the current increases. Because voltage is constant, this result in a high I2R loss in the windings and the motor circuit protection trips on thermal and electrical overload. The formula for electric motor speed is SRPM=(120f)/P. The above is for AC motors. If you are referring to a DC motor, what you have stated is correct. The motor will slow down as load is added. That is why you are not supposed to run many DC motors under no load conditions - they will overspeed.