The Multiple Uses of DC Motors
Author: lizlivetech
DC Motors are argueably the most useful type of electrical motors, and with good reason, they are designed to be used with batteries, solar cells or similar cell based energy sources, and as a result are used in systems where you don't have to be tied to a wall. Furthermore, even in systems where they are tied to the wall, sometimes it can be more efficient and cost effective to run DC Motors even in certain situations. Motors generally though give the impression of a gas guzzling car. In this article, I hope to dispel that myth, and educate you on where and when DC Motors can be and are used.
The lower power motors aren't really useful for things commonly associated with motors. Lifting and transportation applications require more power & torque for them to work. However, what they lack in power they make up in precision. Low power DC motors are particularly useful as speed changes from 0 to 1 are almost instantaneous. Therefore, they can be used successfully in digital systems.
A low speed, low power brushless DC motor can be found in most turntable devices, particularly precision turntable devices. Devices with such motors are things like personal computers (usually, with 3 motors in it, one for the hard drive, and one for the processor cooler), CD & DVD players.
Medium Power DC Motors
Medium power DC Motors have a use too in systems. Generally they are connected to the mains, and use a rectifier to convert the AC current into a DC current to be used for the task in hand. As a result of this, they also need to be stepped down (voltage reduced) so that the current doesn't overpower the circuit and burn out the motor. This limits their usage to larger systems that require room for both a stepper and a rectifier. But they still serve a purpose, particularly in systems where size nor speed is an issue, just reliability. One such place is in pinsetters in a bowling alley, for example.
High Power DC Motors
Argueably the most common and useful motors are High Power DC Motors. These motors are generally used in open systems, and generally used in systems were torque and power, as well as drive are paramount. Examples of such systems include electric wheelchairs, electric scooters, Segways, hybrid cars, as well as in elevators.
Of course, with power comes great power usage, and whilst the most energy efficient form of motor, they can require a lot of energy to run. Part of the creative process of using them is to be efficient (drive systems in hybrid cars use the petrol motor's momentum to recharge a battery, which will be then used to power the DC motor), but generally the battery will need to be recharged or replaced at regular intervals. Even so, it's usually infrequently the battery needs replacing. Furthermore, any systems attached to the mains don't suffer from this problem.
Article Source: http://www.articlesbase.com/automotive-articles/the-multiple-uses-of-dc-motors-973007.html
About the Author
For more information about DC Motors, check out the website of Fracmo, who provide DC motors worldwide for a multitude of uses, incuding in electric wheelchairs.
Using a DC motor as a generator; what power will it produce?
If I have a motor running on a 6v DC supply, and it is spinning at 200rpm (unloaded), if I took this motor and used it as a generator – and spun it at 200rpm, what voltage would it produce? Would it be 6v?
Why SOME dc motor not work as generator ???
Please help me by explain to why some dc motor not work well
as generator.Thank you so much.
What is the waveform of a Brushless DC motor used as a generator? Is it efficient, so-used?
I need output voltage having a form which can be stepped up, as by a transformer or spark coil.
Can a brushless DC motor be used as a generator ?
I understand that a brush-less DC motor must have a controller which generates AC current to drive the unit. My question is; if i bypass the controller and connect the motor directly to a bridge rectifier, will I generate power at a reasonable efficiency.
If I used a 24v brush-less DC motor, would I approximately produce power of 24v?
Thanks for technical expertise!
DC motor as Generator?
Can we use DC motor as DC Generator? can we get the same input voltage as output voltage?
your idea works
turning a dc motor externally by apply torque generates electricity
but for that to work you need to provide torque and speed balance to get sufficient voltage.
it has been done to power a light bulb though but future is yours buddy.
you can connect propellors to it and with wind power make it turn , generate electricity and store it in a battery after proper rectification
Maybe, or maybe a bit less. You would not be able to draw as much current as you put into the driving motor however.
In other words, if you used 6 watts to drive the second motor, you would get less than 6 watts out, no matter how efficient it was, how friction-free the bearings were, etc.
This is known as the second law of thermodynamics.
A dc motor will produce dc output with a good bit of ripple.
You will not be able to step this voltage up with a transformer.
Search for a small alternator or dynamo that is intended to generate ac.
to have a gen. you need to turn the motor with an external power source. where as a dc motor is powered by a dc current or power source;)
There are 2 types of brushless motors.
1 is actually an AC motor, 3- phase,that is driven from an inverter from DC to AC. It is common in such as electric powered models, and varying the AC frequency is used to control speed.
Such a motor might be used as an alternator to produce AC electricity.
Then there is the brushless DC “electronically commutated” type motor, common in such as computer cooling fans. They cannot be used as a generator.