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. H

    Inertia Matching with TWO or more motors

    Been trying to find an answer to this all day. Would really appreciate any help! Assuming the electric motors are perfectly synced-up, would using multiple motors effectively split the inertia loads evenly among the 2/3/4 motors? Correct me if I'm wrong, but with the equation 1/2Mr^2 for...
  2. E

    High speed electric motors specifications

    Hello, I'd like to ask if anyone could give me information or a link to web page where I can find some for the most advanced high speed electric motors used today in cutting machines - speed range, torque and etc. I tried to find searching in Google but I haven't found anything. If someone...
  3. P

    Direct current in electric motors?

    1. Small electric motors with only one armature loop sometimes get stuck. They can be started again by giving the armature a small twist. Looking at the diagram below, what might be the explanation for the motor not being able to start on its own? When the brush(es) reaches the split within...
  4. J

    Mounting rubber wheel on motors

    I am trying to mount rubber wheels on a motor to make a paper airplane launcher similar to this: http://www.instructables.com/id/Super-fast-paper-plane-launcher/ only, instead of wheels, I'm using rubber stoppers (for flasks) I've got two questions, 1) how do I attach them to the motor...
  5. R

    Dc signal generator to several motors

    Hey guys, I got this problem. I have 9 fans motors in which i need to send a range of dc signal of 0-10 volts to each one. I had decided to buy a simple signal generator that can do the trick but soon realized that having one signal generator hook up to 9 motors at the same time will not be...
  6. A

    Creating more Power from electric Motors

    I was wondering if there is anyway to get more wattage out of a 1000 watt motor?
  7. L

    Pulse Width Modulation & Servo Motors Explained

    Hi everyone, I am really trying to get the concept of Servo Motors and am sort of stuck on something, particularly how the motor gets its Pulse Width Modulation. I understand the 0 to 5V with a period of about 20ms and different pulse widths generate different angular positions. What I am...
  8. Low-Q

    Is it possible to create a brushless DC motor that runs solely on DC current?

    Hi, I use brushless DC motors for my hobby things (planes, cars, helicopters). These motors have a special ESC which outputs a 3-phase AC current to the motor. These motors have stationary coils, and a rotary magnet array. The motors have an incredible torque for the size. I have, however...
  9. A

    What is the difference between 24 and 48 volt motors.

    So I've been trying to make an electric bike. I've read that to overcome steeper hills you need higher amperage, but in looking for motors I found a 1000 watt 48 volt motor that is rated for 28 amps and a 600 watt 24 volt motor rated for 32 amps. Which motor creates more torque? If anyone...
  10. D

    Question about motors please advise

    hi all i came here just to get a little advice. i am building a custom lift for the back of my work van. i need to lift up my tool box (which is quite heavy {about 125 lbs}) 3-5 times a day. putting it in and out is a pain. anyway i was wondering which electric motor i should use or what the...
  11. I

    Is a PM Generators output greater than an A/C motors input?

    Hi, If I powered a permanent magnet generator like one found in a wind turbine, with let's say with a 1/2 hp A/C motor for example and directly coupled them together or used a gear reducer to increase the torque and rpm's, would the output watts created by the generator be greater than the...
  12. H

    Full Motion Antenna motors designing problem

    Dear All I want to design a Full motion Antenna. But I want to start from the scratch. Suppose I have a 1m parabolic Antenna and I want to install two motors (Elevation and Azimuth) The motors should be DC. And I want to know how to calculate all the parameters required to move the...
  13. I

    Understanding the Principles of Motors: A Guide to How They Work

    Homework Statement How do motors work? Is what I have right so far? The attempt at a solution Generators: I understand that a coil moves and it cuts across the magnetic flux lines in a magnetic field, emf is induced. So mechanical energy (coil moving) changes into current from the emf...
  14. C

    Linear Torque-Speed Curves of DC Motors

    I'm looking to purchase a dc motor but need to accurately know the torque-speed characteristics of it. I don't really have $$ for a good quality one that would come with accurate info (like I'm led to believe maxon motors do). When buying a cheap dc motor (i.e. from ocean controls. For...
  15. R

    Can Pedestal Fans be Used as Generators for Electric Braking?

    The textbooks say that motors and generators are the same structurally, they just differ in what is input (motion / voltage) and what is output (voltage / motion). I have also read that electric trains use this phenomenon for their 'electric braking', by running their motors as generators by...
  16. M

    Engineering Induction Motors, Generators, Magnetic Field Strength, Force and Coupling

    Homework Statement Here are a bunch of questions that I've attempted. I feel fairly confident with my answers, but I just wanted to make sure :) Thanks! a) calculate the synchronous speed, amount of slip and the percentage slip in a typical aircraft a.c., four pole, 400hz induction motor...
  17. T

    2 pole 4 pole 8 pole motors

    Hi All, Can anyone care to explain what are 2 pole 4 pole 6 pole 8 pole motors? What are the Asian Countries specfically use for them?
  18. M

    Engineering Efficiency Calculation of a DC Series Motor | Homework Solution

    Homework Statement A dc series motor takes a full load current of 10 A from a 12 V voltage source .The iron,friction and windage losses account to 9% of the input power .the field winding resistance is 0.1 ohms and the armature resistance is 0.15 ohms and the voltage drop is 2 V .Calculate the...
  19. B

    Back EMF of Motors: Constant or Variable?

    i am wondering why in some problem they are regarding back emf of a motor as a constant value that characterizes the motor although current is sometimes variable? i guess the reason is for simplifying the problem, what do u think? can this occur in reality? thanks for helping.
  20. R

    Coupling DC Motors with Timing Belt: Vibration Concerns?

    Just a short question. As part of a dyno project, I am coupling two dc motors together with a timing belt. To allow the same rig to be used for different test motors, I am considering mounting this (test) motor on a table, which can be positioned in two directions on leadscrews. This would...
  21. E

    Strange Motor Wiring: 6 Motors, 200HP, 380V 50Hz

    hey guys... i have 6 motors at work, 380V, 50Hz, 200 HP. the terminals are labeled 1,2,3,7,8 and 9. continuity test showed that 1,2,3 are connected together, and 7,8,9 are connected together. how is that possible ?? am i missing something ?? note that that is the case in all 6 motors. thx
  22. B

    Back emf in motors and capacitors

    1-this is what is written in my book: E= Ir+E' where E' is the back emf, r and E' are constants P(mechanical)=E'*I an electrical motor functions only if the generator connected across its terminals delivers a positive potential difference that exceeds its back emf. So my question is, why are...
  23. D

    Alternators and electrical motors

    After reading about a guy who used a permanent magnet dc motor for his wind turbine, I got confused. Can motors be used as alternators?
  24. L

    Can Carven Motors Revolutionize Engine Design? An Engineer's Perspective

    Hi, I am not sure if this new motor/device as shown in carvenmotors.com could work and I would like to know a engineer's piont of view It seems to be a piston but with less parts... do you think it really works? Have you seen any operative? in which aplication? Thanks!
  25. J

    Help me with some motors and generators Q

    Help me with some motors and generators Q! We are learning about motors and generators But I got completely lost when we started talking about Michael Faraday's work, Electromotive force, Electromagnetic induction, Lenz Law I get what Michael Faraday did, applying force to a conductor...
  26. F

    Asynchronous motors - the heat of the rotor

    So I was reading about asynchronous motors, and it seems the motor works better when the resistance of the rotor is smaller. This is fairly obvious, because the smaller the resistance, the bigger the inductive currents and therefore more mechanical force is applied on the rotor, thus its doing...
  27. A

    Design Question: Wiring & Motors

    I am seeking help for a design solution to run wiring through a rotating shaft spun by a motor. Imagine a display mounted on the end of a ceiling fan blade - The signal and power for the display would need to come through the motor (from the within the ceiling) while the entire blade assembly is...
  28. J

    Choice of motors, please advise

    I know you all probably hate this sort of general question, but I'm kind of on a tight schedule so it can't hurt to ask. I am working on creating a prototype for a project which will require a rotating circular stand for an adult person to stand on which will then be capable of rotating at low...
  29. J

    Powersing Two 12V Motors: A Complete Guide

    Hi, new to the whole electrical side of things, have never been good with voltages, currents or resistance etc. So I apologise for any simple questions. So if I have two 12v motors, does this mean I have to include two 12v (or one 24v) supplies? Or somehow does a 12v supply power both of them...
  30. L

    Just curious how electric motors work, specifically DC motors.

    Just curious how electric motors work, specifically DC motors. I have some questions i would like to understand better. do the windings of a motor determine the required voltage to power it? Can a 110 volt ac motor be powered by a 12 volt dc battery without an inverter? Can a 110 volt...
  31. K

    Servo Motors: Precisely Control Force & Pressure

    A normal servo motor gives a highly accurate response to an input, with the output being an angular position of the shaft. For example, give it a 2ms pulse and it might go to +63 degrees. I am wondering what sort of motor (or system) is used to control an amount of force or pressure. For...
  32. J

    Calculating DC Motor Parameters for a Pick and Place Robot

    Hi sir, I am new about to this site.Actually I am an embedded engineer. Right now I am working on :smile:Pick and place robot.I want to control dc motors. I don't have any datasheet of DC motor.But I want to know how to calculate dc motors parameters required for the moments of robot.Right...
  33. V

    Single phase induction motors (cap run)

    I understand there are different types of induction motors. We use single phase 2 pole and 4 pole cap run motors which have a pretty good balance between forward and reverse torque. We are able to get motors where they adjust the coils to get the forward and reverse toque to be different, up...
  34. F

    Calculating Speed for a Mechanical Dolly Driven by Electric Motors

    Hi there, I have recently been working on a project that involves building a mechanical dolly that is driven by 2 electrical motors. I have decided to use 2 electrical winch motors which each have a rating of 5700kg and a drum size of diameter 64mm My question is, how do I calculate...
  35. F

    Question about velocity and motors

    I'm working on choosing an appropriate motor. I have the calculations I need for the required torque, power, max velocity, force, and acceleration. Now I need to know the maximum velocity that a specific motor can move 159 kg 0.45 m across a horizontal plane. In all of my calculations for...
  36. T

    DC Motors & Gear Boxes: Get Ahead of Your Assignment!

    Ey guys sorry if this is in the wrong area; not too sure but i do mechanical eng and figured it was. Well i hope so lol otherwise i might have selected the wrong course We have an assignment coming up, (according to past year students that involves DC motors, gear box's). Wouldn’t mind...
  37. A

    Photovoltaics, Electric motors ,Solar energy. Should i go for EE?

    Hello. I want to work with Photovoltaics and with the renewable industry. Electric motors, boats, cars. Is EE a good choice? I was thinking first in ME but looks like you see more of solar energy in EE. Please i need urgent advice i only left like 2 moths to make a choice.
  38. E

    Replacing Aluminium windings for Motors with copper wires

    Good Day, I have defective Aluminium windings motor. As you know Aluminium is very difficult to winding. So, I want to use Copper wire to re-winding the motor. How can I do that? What size should I use and what will be the number of turns? Someone told me that you can use...
  39. S

    Question on Ohm's law and motors

    I am an electrician, and I recently got into some trouble on an issue. We were trouble shooting a fan motor that was rated at 240v and was only getting 208v. The more experienced electricians I was with said the amperage was going up because there wasn't enough voltage. This makes no sense to...
  40. I

    Effects of rewinding ind. motors with higher resistance that the initial?

    I wonder where I work, 3-phase ind. motor with 80 ohms resistance per phase from the manufacturer was re winded and the new resistance per phase was 89 / 90 / 94 Ohms in the 3 phases. when the motor was put back, it burnt within few hour, why was this?
  41. L

    Understanding Induction Motors: Comparing Different Coil Arrangements

    I grasp the concept of induction motors - with a rotating magnetic field. A good example is this one: http://upload.wikimedia.org/wikipedia/commons/f/f1/3phase-rmf-noadd-60f-airopt.gif" Each outer coil is arranged 120 degrees away from one another and their current is 120 degrees out of...
  42. K

    Could heat in motors be minimized when driven with quasiparticles?

    I am wondering if high strength electric discharges can in effect produce magnetic fields that can alter the magnetic ordering of particles in copper, which is otherwise a diamagnetic material. All atoms do possesses subatomic particles with magnetic moments, do they not? Could these not be...
  43. J

    Understanding Alternating Currents Motors - Issues & Solutions

    Hi,I am new here^^17 years old... I got a little problem with understanding how simple alternating currents motors/AC Motors work... Anyone has a good Table or Figure?? Magnetic problems: 1)Whats the difference between inducing current and normal electric current?? 2)Whats the meaning...
  44. B

    Deriving Thrust from Newton II for Rocket Motors

    Homework Statement Derive from Newton II the thrust (the force produced by the rocket exhaust) achieved by a rocket motor which ejects material with constant velocity u and mass ejection rate a. Homework Equations The Attempt at a Solution Not sure...I know how to derive vf =...
  45. E

    Designing a Satellite with Two Motors

    hi all look i haven't finished the control I subject ..and the Dr ask us for a project. i've got an idea i want to design and satlight with two motor if anyone can help me with the basic i would be greatfull if there any site can explain that ..please i need it
  46. F

    Why do Electric Motors have High Torque?

    Simple question. I've been reading qualitatively about the torque and power curve of electric engines versus internal combustion engines. I'm led to understand that electric engines get much higher torques even at lower speed. One argument for why electric cars are inherently more efficient than...
  47. R

    me to find the required power (HP) of these electrical Motors

    find HP of electrical Motors Required Dear guys, As you see in picture, there is a two rolls. Top roll have a Rubber Surface Coating (Weight : 1000kg, OD:550mm, ID: 448mm, Face Length : 1950mm), Bottom roll (Weight : 1500 kg, OD:605mm, ID: 535mm , Face Length : 1950mm ) is a steel surface...
  48. B

    Why motors can convert energy?

    why motors can convert energy?? why motors can convert energy when you'll only just spin it??
  49. P

    Exploring the Possibilities of Self-Powered Motors

    I know this can't be done, else everyone would be doing it, this question is more of a "why can't it be done? and what are the difficulties that make this impossible?" rather than a "Why is no one doing it?". We have a motor, naturally we would connect it to our mains and draw power, the...
  50. H

    Understanding Induction Motors & Reactive Power

    I was reading about induction motors and speed controller(self commutated inverters for cage motor), and i didn't understand this sentence:"The induction motor can either absorb or deliver reactive power". Thanks for any help.
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