What is Motors: Definition and 333 Discussions

An engine or motor is a machine designed to convert one form of energy into mechanical energy. Heat engines convert heat into work via various thermodynamic processes. The internal combustion engine is perhaps the most common example of a heat engine, in which heat from the combustion of a fuel causes rapid pressurisation of the gaseous combustion products in the combustion chamber, causing them to expand and drive a piston, which turns a crankshaft. Electric motors convert electrical energy into mechanical motion, pneumatic motors use compressed air, and clockwork motors in wind-up toys use elastic energy. In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces and ultimately motion.

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  1. G

    DC Shunt Motors: Differences from Simple DC Motors and Relation to Generators

    how dc shunt motors are different from the simple dc motors and is there any relation between between generators
  2. M

    Why we dont use Magnet Motors?

    Hello Everybody I heard about unlimited and free energy from magnet motors like perendev magnetic motor I believe that it work , Do I think true? I think perendev magnetic motor specification is: good Torque cheap GREEN Energy Easy to build My question is : " Why we don't use Magnet...
  3. S

    Engineering Calculation Help with mechanical motors

    Homework Statement I am a beginning engineering student at UCF and was given a group assignment to build a mechanically powered "rover". The driving force of the rover will be decided on one of two possible drive systems, which ever proves to be the better engine. The first being similar to a...
  4. T

    Can Magnets and Motors Work Together?

    What would happen if you were two create something like in the photo. Lets just say that the magnets on the right are on the axle that's connected with motor. While the other magnets to right are on an axle. Would the magnets on the motor drive the other one?
  5. Q

    Electric Motors: Understanding How They Function

    Hello. I'm new to this forum, and will probably be harrassing you all with questions for quite some time. My first question deals with electric motors and how they function. I am currently in a Physical Science class in my college. For whatever reason I cannot seem to get a firm grasp on how...
  6. N

    Which Motors Are Best for Your AGV Design?

    hi all I m designing a AGV (automatecd guided vehicle),i use DC motor and step, i have read a catelogue motor,but i don't know how to chose motor pertinently. More information about the motor http://www.motionking.com/Products/Hybrid_Stepper_Motors/HB_stepper_motors.htm"...
  7. J

    Ferromagnetic Windings in Electric Motors: Can They Operate?

    Can the wire windings in an electric motor be ferromagnetic and still operate? Why?
  8. N

    Electric Motors and/or Maglev Texts

    I'm trying to learn about electric motors, and I would eventually like to learn about how the maglev trains work beyond the general descriptions. I have found these two books so far: https://www.amazon.com/dp/0750647183/?tag=pfamazon01-20 by Austin Hughes...
  9. R

    Hydraulic motors for hovercraft propulsion?

    For a proposed Hovercraft propulsion system, 1a) Is it feasible to use separate hydraulic motors to power a) four wheels for land propulsion, b) two water propellors for water propulsion c) two lift fans d) six actuators for retracting / deploying the wheels and propellers. 1b) Can the...
  10. D

    DC motors combined to increase volts?

    Hello all, I was wondering if it is possible to increase voltage if you combine 2 DC motors together? I know that it is NOT possible to increase the voltage if you put it into a series circuit since it won't work. As for the batteries you can increase the volts if you put them into the...
  11. A

    Can Bedini Free Energy Motors Really Defy the Laws of Physics?

    Is it true? Does this really defies a law of physics? (More output than input). or is it bluff...
  12. D

    Q: Torque-speed? Motors and rotating plinths - Please help

    Dear engineering gurus, I was wondering if some of you might be able to help me out with my project (2 part question): I'm basically trying to make a rotating plinth (like those used in jewelry displays - except i need it to bear a weight of 1kg. (Most ready-made plinths won't take...
  13. L

    What causes the back emf in motors

    What causes the back emf in motors (brushless DC motors to be exact). First thing is the rotating magnetic field of the rotor, which cuts the stator coils inducing an emf in the opposite direction. This would increase as speed increases. This is just a generator. Second, what about self...
  14. I

    Challenge: Multiple Motors in Series

    I have an electrical engineering question for all you electrical engineers! If I have multiple motors in series, there will be a voltage drop due to the internal resistance of the motors. What will this look like for the motors? Will each motor experience a different voltage or will the...
  15. S

    Linear Electric Motors: Pros & Cons

    we were learning about electrical motors in class the other day and my teacher mentioned linear electric motors, which from what he said are basically standard motors 'unravelled'. i was wondering why, if this is the case, you would ever use a standard motor when linear motion was required? why...
  16. A

    Connecting HDD Motors to Microcontrollers

    Hello Forum , anybody has an experience with HDD motors , how can be connected to a microcontroller ? Thank you in advance Anita
  17. H

    Hydraulic Motors: Varying Speed With Constant Output Pump

    How can we vary the speed of hydraulic motors running through a constant output pump??
  18. T

    Optimizing Motor Performance: Series vs Parallel Wiring

    I'm working on a project that needs to power two electric motors (PC case fans). These fans are rated 12V - 0.3 A. The power source is a AC-DC adapter that outputs 12V and rated for 0.3A. My question is simple: should I wire these motors in series or parallel maximum their speed? I have a...
  19. M

    Three phase ac motors 110v help

    I have a motor i am trying to get to work. The tag on it says its a three phase asynchronous motor. 110v and i think the current is 6.9amps. When i turn it on it hums and if i spin the motor it will start to go and will spin very slowly but as soon as any resistance is applied it stops and just...
  20. R

    Power generation using electric motors

    Hi, I am a novice. I have very sensitive high end audio equipment. I want to power them up from an independent source. I was contemplating using a electric motor driven generator. I want to do this to supply cleanest power to the equipment/electronics. My power requirement is about 5 KVA. I am...
  21. G

    Single Phase Capacitor motors.

    Hi guys, I have a question about working out the capacitance of a capacitor. I am not great at electronics, but if i understand correctly the capacitor in a capacitor motor is what makes it start spinning. I'm wondering is anyone could recommend a good resource for reading about how this...
  22. T

    Understanding Voltage, Amperage, and Wattage for DC Motors at Low RPMs

    Hello All- COuld someone please give me a primer on DC as it pertains to voltage, amperage and wattage. Specifically, if I have a motor that i need to run at very low RPM (50 -150), how does the motor compare across a 12v system vs. a 24, 48 or even 60v system. Do 60v systems run more...
  23. E

    Help Understanding Simple DC Motor Design & Maximizing RPM

    The design I am building is like the simple DC motor design on http://www.coolmagnetman.com/magdcmot.htm I need some help in understanding how the shape of the loop of current carrying wire (like the difference between a square and circle shape) figures into determining the rpm on a simple dc...
  24. L

    Any good sources for starter motors (without gearbox/solinoid)?

    I'm trying to find a DC motor in the 3-3.5kW 12-24V range (Preferably 24V) for a project that will utilize the motor at maximum power for occasional short bursts of maybe 2-3 seconds in duration at most. The motor needs to be fairly small, lightweight, and CHEAP ($100 or less). Starter motors...
  25. C

    Help explaining that perm. mag. motors don't work

    Alright this is hard for me to write because I feel like a backstabber but I need to stop him before he destroys my family. My father is a very smart small business owner and inventor and he is very near hitting it "big" with one invention. However, he has another project in the works that is...
  26. A

    Understanding DC Motors: Heat, Wire Thickness & Multiple Speeds

    I am working in an Auto Parts manufacturer company which one of its production is DC motors used in different wheicles. I have two type of question about a DC motor : 1: we have a new model DC motors which get too hot. what's the reason? what does the effect of the thickness of cooper wire...
  27. DaveC426913

    Looking for radio control components - wireless stepper motors

    I'm ready to begin proof of concept experiments on the Mk IV Tesseract, following on the limited success of https://www.physicsforums.com/showthread.php?t=205845" What I need is a motor that - is reasonably compact (we're talking <2 centimeters) though weight is not a factor - can be...
  28. C

    Where to Get Small Brushless DC Motors

    Hopefully this is the appropriate forum for this sort of question, but I was wondering if any of you might know where I could buy small brushless DC motors online. I've been Googling around for a while, but most of the ones that I found are too large and expensive for what I need, as they're...
  29. P

    DC Motors - Armature and Field interaction?

    Decided not to use the template as I'm not asking someone to do my homework for me, please don't delete! Anyway, doing my A2 coursework on the workings of a DC motor. I found that when the armature and field electromagnets are connected to separate power supplies that, when it appears they...
  30. K

    Brushless DC Motors suitable for Underwater?

    Hi people, im new to this forum. I'm currently working on a underwater ROV for my school project. We did a experiment recently on the performance of our ROV. We met up with some problems on the motor & the propeller for the thrusting. The motor stalls just after 5secs. So I am thinking is...
  31. M

    Synchronous Motors: Can Rotor Spin with 3-Phase AC Supply?

    Hi, I have a question about synchronous motors. If the DC field winding of a synchronous motor were to be replaced by a low-impedance short-circuited coil and the stator were to be supplied with 3-phase AC, would the rotor spin? If the answer is yes, would the rotor follow the direction of...
  32. J

    Electric motors & faraday's law

    Homework Statement Eliza connects a power supply, switch, and a multimeter (in ammeter mode) in series with a wire coil. The wire coil is held into place by 2 connecting wire leads. One of the wire leads has been stripped off of the insulating enamel coating so that half the wire is bare; the...
  33. A

    Unlocking the Power of Magnetic Motors: Research and Results

    I have been doing some research on pure magnetic motors. I have seen countless vidoes on youtube.. [ http://www.youtube.com/watch?v=ZI4NDrPQ2rA&feature=related ] for one. In these type of motors use the concept of "reshaping" the magnetic fields to allow unidirectional force on a rotor...
  34. J

    Motors & Generators practical investigation ideas

    Hey everyone I'm a physics student doing my last year of high school in Australia. For an assessment task I have to do a practical investigation on electric motors and generators but I am a bit lost on this subject. I need a few ideas that are easy to understand and prove/disprove using a...
  35. A

    Lenz's Law & DC Motors: Effects & Benefits

    Hey there, I've been searching online for a quite a decent amount of time trying to wrap my head around this concept. We've been asked to research the link between Lenz's law and DC motors, and for some reason I was given the impression that back emf was a positive to DC motors. After...
  36. J

    What are the differences between 2-pole and 4-pole motors?

    Hi everyone, I'm a graduate mechanical engineer and I was wondering if I could open up the discussion of 2-pole versus 4-pole motors. Recently I have had to specify such motors for work and wanted to find out the advantages and disadvantages of each type. Mechanically I realize that 2-pole...
  37. Phrak

    Tesla Motors claims 114% efficiency

    Tesla Motors claims a "well-to-wheel" efficiency of 1.14 http://www.teslamotors.com/efficiency/well_to_wheel.php" What in the blue blazes are they talking about?
  38. M

    Capacitors in Electric Motors: Usage & Benefits

    What is the use of having capacitors in fans, cooler motors or other electric motors ?
  39. Z

    High Temperature Superconductivity & Electro motors

    If we build a High Temperature superconductor without Meissner effect ; So it can build energy?:confused:
  40. A

    Three phase induction motors

    hey does anyone know the effiency and power factor of a typical three phase induction motor? cheers,
  41. K

    Do Displacement Currents Exist In Electric Motors

    I am not asking if they are considered as input into the armature's magnetic field. I strongly believe they are NOT even considered when designing motors. The question is, "DO THEY EXIST IN MOTORS?" Based on evidence from conventional theory, it appears they do infact affect the output of...
  42. J

    Can Electric Motors Match the Power-to-Weight Ratio of Human Muscles?

    Is it possible for electric motors to compare to the strength of human muscles, in terms of power-to-weight ratios? That is, with the proper engineering, is it theoretically possible? I don't see why not, simply increasing voltage increases power, if the heat generated is a problem, can't the...
  43. J

    Best practice for large electric motors

    This may not be the place to ask this question, but I can't seem to get a good answer anywhere else...I have a manufacturing company. I am on a 3-phase demand meter. I'm trying to figure out if it is more cost effective to shut all the electric motors down during breaks and lunch and restart...
  44. D

    Selection of DC motors for EV and controlling them

    Hi, I am designing a small EV and I am looking forward to some guidlines regarding designing of H-bridge (torque) controller for controlling somewhat in between 6-8 permanent magnet brush DC motors , the overall power required from these motors is between 70 to 250 W, where 70 W is for...
  45. L

    Applications of DC Motors & Generators: Assignment

    Hi I Have Got An Assignment On Applicatiions Of Dc Shunt Motors And Dc Shunt Generators. Plz... Guys Post Ur Replies Soon. Gotta Submit It Tomorrow
  46. H

    Syringe Pump Manufacturing: Motors Used in Systems

    What does it take to manufacture such a syringe pump? What kind of motor is usually used in these systems? http://www.macros.com.tw/p_kds.asp
  47. E

    Engineering Methods used of coupling motors

    Name the methods of coupling motors to drive a load...
  48. F

    Reduce magnetic radition from motors

    Hello. Im building a small car, that should be able to navigate/drive arround on it own. The short version of my problem can be stated as: 2 DC motors, 1 compas ;) The two DC motors are PWM controlled, and dispatch magnetic noise all arround. To be able to work with my compas, I would like...
  49. L

    Best efficiency DC or AC motors?

    I was thinking in the last weeks about electric cars and thinking about a DIY project in a future. Here's the problem, which motor is best for an electricar? Which have the best efficiency, torque and speed? Now considering that choosing an AC motor an inverter is needed and there would...
  50. G

    Robot (controlling motors with computers)

    I want to make a small robotic arm and control program like the kind schools use to teach kids about robot arms. I need alittle guidance though, I only know how to use C++ to say "hello world!". How would one go about making a computer program to control a stepping motor? And how do I choose...
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