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. R

    How do you find the gears you need in motors?

    Dear Experts I have this problem for a long time. I always cannot get my project done because parts are not available. I need gears, eg. Pinion gears of certain size of certain number of teeths and the hole in the middle of the gear need to be of certain size. How do you normally get...
  2. M

    DC motors seem to have shorted rotors

    A practical DC motor armature is nothing but several "textbook DC motor" single armature windings bundled togheter and isolated together right? Like on this picture: http://content.answcdn.com/main/content/img/McGrawHill/Encyclopedia/images/CE152200FG0010.gif What really beats me though is...
  3. G

    Questions about batteries and electric motors

    a concept i can't grasp is the meaning of voltage for an electric motor. it seems all the motor needs to operate is a magnetic field which is generated by current. why does the electric motor "care" whether the current is fed to it from a 100V or a 200V battery? Isn't the concept of voltage...
  4. S

    Simple DC motors Current, Torque, EMF and Faraday's Law

    Ok, so I'm doing an experimental write up for an experiment on adjusting voltage on the speed of a simple DC motor, and changing the number of coils. I thought that I understood what I was saying but I've recently become a little confused with the concepts of torque vs speed specifically when...
  5. K

    Current drawn from motors and Eddy Currents

    Hi, I am about to sit my Physics A-level paper next week and I have a couple of questions. My first question is rather broad, but what are eddy currents? I understand they're formed in transformers and how their effect is reduced, but I don't understand exactly why they're caused. Am I right...
  6. O

    How to Derive constant of total back/counter EMF for DC motors?

    Hi, I have been reading around about back EMF and their derivations for simple DC motors. However for some reason, the step between obtaining the total emf of the motor from summing the individual emf of the coils is not very clear. For example: Induced emf due to single coil: e = d∅_c/dt...
  7. S

    What kinds of Magnetic assemblies can meet the needs of the motors

    Hello! Can anybody tell me about what kinds of magnetic assemblies will be the essential in Electric motor manufacture field？ And please give the reason.Thank You!:confused:
  8. R

    Will These Motors Be Powerful Enough?

    Hi everyone, I plan on getting a deeper understanding of this soon, but for the time being I'm just looking for a quick answer so I can order the parts needed. I'm building a rover that in total (including all parts) will weigh about 15-18 lbs. It has six equally spaced legs, each...
  9. R

    Connecting 30 motors to one source help

    Hi guys. I am having some issue and would love any help. I have a project that requires 30 motors to be hooked up to a single power source. The problem is, the surge voltage that happens the moment the motor turns on causes the buildings circuit breaker to trip. The only way to bypass this...
  10. H

    Power Tools: Understanding DC & Brushless Motors

    Hey guys, Currently doing a task on electric motors and their uses in things. I have chosen to do power tools (specifically cordless drills) as I am aware that many have employed brushed DC motors but now use brushless technology. Firstly, I don't know if any of you guys have done something...
  11. S

    DC Motors and Nameplate Ratings

    I picked up a DC variable speed treadmill motor for a project that I am working on and I am having a hard time finding the information that I need. I need to drive a secondary pulley through a range of RPM up to a specific point. In order to pick the right size pulley, I need to be able to...
  12. V

    Small non-magnetic motors that work at temperature of 4 Kelvin

    Does somebody knows which companies produce small (approx. matchbox-sized) motors that can work at temperature of 4 Kelvin and are nonmagnetic ? For example like this one: http://www.attocube.com/nanoPOSITIONING/ANPx341/ANPx341.html
  13. T

    Does amperage matter in induction motors?

    if i increase the amperage in an induction motor, will the induction motor spin faster? and vise versa?
  14. R

    Power-to-weight ratio of electric motors

    I wasn't sure whether to put this in the mechanical engineering board or not but since electrical engineers typically design electric motors, I'll put it here. From what I hear, all types of electric motors have terrible power-to-weight ratios. So if we were to hypothetically one day have a...
  15. B

    Induction Motors: Power Consumed vs Power Delivered

    Hello The equation for power consumption of a three phase induction motor is given by the equation: P = sqrt(3)*V*I*(PF) Does this differ from the power that is delivered to the motor. For example, if a motor is running at 460 volts, 30 amps with a PF of 0.82, then the power...
  16. C

    Electric motors and gears: torque, rpm questions

    Hi guys, new here to the forum. I was an electrical engineering student but am now working on more of a mechanical issue so I'm a bit out of my element. I am working with a small electric motor attached to a gearbox. The final gear opens and closes a metal valve. I am having trouble finding...
  17. R

    What can be done to make electric motors louder?

    I like pure electric cars but one thing that sometimes annoys me is how quiet they are. Many car enthusiasts will never buy electric cars solely because they don't sound as "cool" as a roaring internal combustion engine. Also, it is dangerous for cars to be so quiet. Many pedestrians and drivers...
  18. K

    How to remotely control 4 DC motors?

    I have to build a device which have 4 dof governed by 4 separate motors. Need to remotely control which was the motor spins and when to stop them. What equipment do I need? and is there any guidelines? Need help asap. Thanks,
  19. R

    Ripple Current in Aged Brushed DC Motors

    I work as an engineer and I've been looking for an explanation for something that I have been puzzled by. Physics background of problem: In brushed DC motors, electrical coils (poles) rotate as the motor moves. A change in inductance as they move makes small variations in motor current...
  20. T

    Would an inverter welder be a suitable power supply for high amp stepper motors

    Good day people. I am new here and discovered the forum while trying to answer this question. I have a large variety of brushless and stepper motors collected all for the purpose of putting together my CNC mill. The router will be 80 amp 5500KV Kevlar bandaged brushless motor capable of 100,000...
  21. Crazymechanic

    Electric motors, generators

    Hi , maybe a pretty simple question and about things that we have long used and know well but is there a electric motor or generator that is truly DC? As much as I think there isn't because either to create , induce electricity in windings (generator) u got to have a changing magnetic field...
  22. R

    Boeing Will electric motors ever propel a 747?

    I've been told that a 747 will never be able to be propelled by electric motors even with room temperature superconductivity because batteries have too low of energy density. So if hypothetically we were able to develop a battery with energy density as high as jet fuel, would electric motors...
  23. R

    Application of superconductive motors to electric cars

    At the moment, I believe the fastest electric car is made by Shelby Super Cars and it can go at a top speed of 208 mph. Are there any estimates around predicting how fast electric cars will be once companies start using superconductive motors?
  24. M

    V/f speed control of 3 phase Induction motors

    When the voltage / frequency is maintained constant in 3 phase Induction motor i.e. flux is maintained constant by changing the voltage and frequency in same proportion, What is the torque proportionality equation. Whether Torque is proportional to Slip X Frequency or Torque is...
  25. cepheid

    DC-DC converter that can handle reverse current for motors

    I have a stepper motor with built-in controller/servo system that requires a supply voltage of 24 VDC +/- 10%. The problem is, the power system I'm using is a lead-acid battery that is normally maintained at a top up voltage of 27 V to 28 V, which exceeds the upper limit motor input. Most of the...
  26. I

    Circuit Frequency's effect on electric motors

    What is the effect of the Circuit Frequency on the Electrical Motors which runs the production line! For example if we had like 3 - 4 Motors! Effect on: Efficiency of the motors! Speed of the motors! What about if we had a " Servo Motor " which runs one of the machine!
  27. C

    How electric motors consume energy?

    What exactly makes the motor consume the electrical energy? I s heat dissipation higher that in a normal coil? Is it counter-electromotive force? What makes the voltage drop? Thank you regards
  28. S

    Single phase motors with 3 wires into motor HElP

    Hey I was wondering if anyone could help me, I have a single phase motor with a single capacitor,on a woodworking saw, which the switch broke, it was sprung loaded, so I guess a start run switch. It's for a friend and he took the switch off without marking the terminals, I can't find another...
  29. C

    What Happens to the Magnetic Field Outside of a Motor Coil?

    hello sorry for the bad description I've always loved physics since i was in school so I've decided to start a project so please forgive my lack of technical wording and ignorance i promise am a quick learner lol on a motor we use electricity / current passed though a coil to create a...
  30. M

    Need help choosing suitable power supply for DC motors

    Hi everyone, I need a suitable power supply that runs off 240VAC (a regular mains socket found at home) to power two DC motors in parallel. The motors are each rated at 24V, and have a full load current rating of 15A. I've performed a search, but the power supplies I've found are either...
  31. T

    Difference between small and big outboard motors

    I was just thinking about something regarding outboard motors. I'm thinking the only thing that differs say a 5 Hp one from one with say 150 Hp is how fast the propeller turns - after all, it's the only part that interacts with the water. So why can't you just use gears to make a small engine...
  32. D

    Permanent Magnet Motors vs. Non-Magnetic Motors: Which is the Superior Choice?

    Choose between two: A. Permanent magnet motors( Being the shaft/rotor) B. Non-magnetic material( Same being the shaft/rotor) Give me you're answer and a detailed explanation why please!
  33. M

    Looking for an in-depth book on motors and drivers

    Hi everyone, I've been trying to find a good book on electric motors, but most of the ones I have come across feel like they're geared more towards hobbyists. It seems like one of those things we aren't really going to do much with in classes, so I'd like to study it on my own. If you could...
  34. N

    Electronic Speed Controls & Brushless Motors

    With an ESC powering a brushless motor, does the ESC get power feedback? Sorry I don't know the terminology, so I'll ask it a couple of ways. The power from the esc runs through a big length of wire windings. I get this isn't a short circuit since enough of the power is turn into heat, does the...
  35. R

    Motors for a scale model plane (airfix not rc)

    I'm looking to put motors into a scale model plane and was just wondering whether the motors I've picked will be ok and what sort of supply voltage I would need. I'm going to use 4 of these.7 Specs: Operating Voltage: 3.7V Diameter: 7.0mm Length: 25.5mm Output Shaft Diameter...
  36. T

    What is the work done by rocket motors in deep space?

    Homework Statement Rocket motors make a rocket of mass of 2200kg accelerate at 2.5m/s^2 over a distance of 650m in deep space. What is the work done? The Attempt at a Solution F=m*a 2200kg*2.5m/s^2 = 5500N 5500*650= 3575000 When I look at the answer page it tells me the force...
  37. A

    Detailed Windage losses calculations, rotating electric motors.

    Hi everyone, Long time reader first time poster. A little background on myself, 4th year in the field of ME mostly in simulation and analysis (FEA). I am currently working on a project of a high speed electric motor. I am putting together all the losses from the rotating motor (Copper...
  38. L

    Robotic Table Tennis Player: Selecting Motors for High Response

    Hi i want to work on robotic table tennis player. So i am confuse that which kind of motors should i use. I need high response motors.
  39. D

    Why don't magnetic motors work?

    THIS IS NOT A POST ABOUT FREE ENERGY. I know this topic is against the rules, and I am not foolish enough to believe such a thing exists. I just want to understand the root flaw in such a concept. I have two suspicions about why you can't use the repulsion of magnets (with no other source of...
  40. W

    How to slow down a 1.5-3v motors RPMs?

    Ok so I posted a question before and it didn't get answered, however I am very tenacious and read around on the net for about 4 hours and finally got my answer. My new question is this: I went to Radio Shack and bought a 1.5-3v motor, I have tested it and it works with my AA battery (as I...
  41. OmCheeto

    Via Motors 100 mpg full sized truck.

    Is this an April Fool's joke? https://www.youtube.com/watch?v=Fygtg9qtJpU
  42. B

    Question about single phase AC motors

    Single phase AC motors generate a rotating magnetic field using two inductors which are turned on and off sequentially. The second inductor is connected to a capacitor to change the phase angle of the electricity delivered to it. When the supply current is turned on, one inductor is turned on...
  43. R

    How to Read the Position of a DC Motor for a Car Mirror with Memory Project?

    Hi my name is Rami am from Syria and is my first post here, I'm studying communication engineering and I'm working on a junior project about ( car mirror with memory ) that saves the locations of a car mirror for many drivers .. i'm using Atmega-16 to do this with keypad and L293 Motor Driver...
  44. E

    Motors and Generators equation help?

    Motors and Generators equation help!? 1. A conductor carrying 2.5A experiences a force on 0.6N when 0.4m of its length is placed in a magnetic field of intensity 2.0T. a) Find the angle the conductor makes with the field b) Predict the angle where the conductor will experience maximum...
  45. D

    Electric motors momentum and load

    hi, this is not a question from Hw its pure interest. 1.lets say i have an electric motor with a shaft radius r lengh L, and at its end there is a metal disk with radius R and thickness b. if the motor supplies torque τ what would be the momentum on the disk? i was thinking that i the motor...
  46. X

    Why aren't the coils in electric motors insulated?

    In all the electric motors I have taken apart, the coils on the armature have never been insulated. This has always confused me because, how could the coil make a sufficient magnetic field if it shorts out to the adjacent wires from lack of insulation?
  47. B

    Understanding Brushless Motors: A Comprehensive Guide

    So here is the thing. I was searching the internet for information about brushless motors. Everywhere I went, they had mixed statements about it. Long threads about which is it, is it controlled by AC or DC or what have you. I am interested in book, that is covering this subject in depth...
  48. C

    Why industrial motors etc need 3 phase power?

    Why industrial motors etc need 3 phase power and something like a TGV (high-speed train) only needs 1 phase (25 kV AC railway electrification), and yet its capable of such performance?
  49. N

    A question about DC Motors, Clutches, and Brakes.

    I am making a functional model friction crane. I am in the design and material gathering phase right now, but I have a question about DC Motors and how they would behave in a certain situation. I plan on having a DC motor spinning a shaft with a clutch on it. When the clutch is engaged...
  50. N

    Can a 48V & 32Amp Battery operate Two Hub Motors of 36V each (750W)?

    Hi, I am doing a project of making an electric car while using two DC Hub motors of 36V (750W power) each, one on each rare wheel. I intend to use a single Lithium ion battery of 48V and 32 Amph to operate both the hub motors. Please tell me 'can a 48V & 32Amp Battery operate Two Hub...
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