What is Motor: Definition and 1000 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. C

    How Can a Simple Electric Motor Be Created Using a Coil in a Magnetic Field?

    Homework Statement A coil is formed by wrapping 80 cm of thin wire round a non-conducting square of size 2 × 2 cm which is placed in a horizontal magnetic field of strength 20mT. A)Sketch the orientation of the coil that will result in the maximum torque acting, and the value of this...
  2. A

    Windage calculation for axial motor

    Hi, I'm attempting to estimate the windage losses in an axial motor design, and I'm having trouble with the formulas. It might be a math error, or a misunderstanding of the formulas, but I seem to be stuck. An axial motor can be modeled as an annular disk spinning in an enclosure. The disk...
  3. S

    Potential Difference ( Battery + Motor )

    Homework Statement Hey, I know this is exteremely basic problem and the answer is "easy", but I can't just get the exact idea why it's so. "The starting motor of particular car has a resistance of 0,15 Ω and is powered by 12 V battery through a cable which has a resistance of 30 mΩ ...
  4. B

    Can electrical motor produce a spark?

    Hi Guys, I am building an equipment to Zone 2 explosive atmosphere. Machine will be powered by the pneumatic motor. I just had an argument with my boss. He says that I need to order an atex approved motor and I say that I don't because the motor will never produce any spark. What are your...
  5. S

    How do I size a hydraulic motor to fit a 12 propeller to move water?

    How do I size a hydraulic motor to fit a 12" propeller to move water? I have a 35 HP diesel motor direct driving a hydraulic pump producing 16 GPM at 2000 psi. The hydraulic pump would be connected with hoses to a water pump inserted in a pipe. I want to design/build a water pump using a...
  6. R

    Engineering Finding motor line current and induced e.m.f?

    1. A 400 V, 10 HP, 3-phase synchronous motor has negligible armature resistance and a synchronous reactance of 10 Ω/phase. The motor runs at unity power factor. Determine the motor line current and the corresponding induced e.m.f for full-load conditions. The efficiency of the motor is 85%...
  7. N

    Motor Torque to Stabilize Inverted Pendulum

    I am trying to stabilize an inverted pendulum with a physical system as follows: The measured values of the pendlums angle and the cart (runner block) position are sent to a digital controller. The digital controller then outputs a value that is sent to the motor to turn the belt pulley...
  8. T

    What happens if i apply different AC frequencies into a motor?

    so let's say i have a motor and two sinusodial AC power supplies. they both have different frequencies but the same voltage. i apply both of them into the induction motor. what will happen in terms of speed or anything else which can affect the motor's performance?
  9. C

    DC Motor: Wooden vs Metal frame/shaft

    In DC motor or even in AC motor, if we use wooden frame and shaft, would it be advantageous than using Metal frame and shaft? Assume that would can with stand any temperature.
  10. T

    Universal motor and the second law of thermodynamics

    Hi, I noticed that universal electric motors have peculiar electrical <=> mechanical transfer function, which seems to break the second law of thermodynamics. Can anyone show where did I do the mistake ? ** Universal motor (series wounded) is a motor where rotor and stator...
  11. T

    Medical Involuntary motor reflex delay while sleepy

    "Involuntary motor reflex" delay while sleepy Ok, I do confess I got pat of the title from Mel Brook's movie "Young Frankenstein". That said, here is my question. I'm trying to find an extremely non-invasive way to detect when a person is losing attentiveness, or getting sleepy. FYI, I'm an...
  12. C

    Motor Power, Torque & Battery Run Time for Miter Saw Tool

    I saw 15 Amp motor which runs on 120 VDC with 5500 rpm [This motor was attached to Miter Saw tool]. I'm not sure what's HP of that motor, but I read 5.5 HP, however the size of motor is around 6 inch long and 4 inch diameter (Is it possible this small motor have 5.5 Hp? And can we calculate...
  13. R

    How can I troubleshoot motor burnout caused by a missing neutral bridge?

    Hi, We installed a chiller unit that had a working compressor. We turned it on, but nothing worked, after some fault finding, we found in the main panel, also newly installed, the neutral bridge was missing. This created problems as the neutrals on the chiller then created false highs on...
  14. B

    Brush DC Motor Science Project HELP

    So I have a Gr 11 Physics Science project. I need to build a Brushed DC motor. I already build an armature with coils. I have a copper commutator and copper are connected to it. Lastly, I placed electric tape on the wood body The problem is that I don't know how to make an effective Brush...
  15. A

    The working of an electric motor and generator

    I have a very silly question . I know how an electric motor and generator work; the changing magnetic flux and current flow causes the coil to rotate etc. and it generates mechanical or electrical energy. M question is how does turning of the coil generate mechanical energy from electrical...
  16. Z

    New type of electric motor (true BLDC)

    [url]K-yyJF-kTMw[/youtube]I'm not 100% sure it works because I haven't built a physical prototype yet. Though, the only problem that I see at the moment is the low power density potential and the low efficiency. Meaning that it WILL NOT REPLACE conventional brushed or BL motors. I would really...
  17. D

    How do I calculate DC motor speed for a given load?

    A Wheel of a self balancing skateboard of radius 7 cm is rotating at 2600RPM with torque for motor is 1.76Nm,current is 10.4Amp and 24v and total load is 90kg (10kg for skateboard and 80kg for user). What is the speed of self balancing skateboard the in km/hr with load?
  18. D

    Most suitable type of electric motor to be used in electric bike

    how to select motor for electric bike?
  19. 0

    How Can A High-Torque Motor Have Low a low RPM

    Torque is the rotational force. If there is more force, how can the motor be slow? I'm building a DC motor and read that given a constant amount of coil, creating a very dense coil will increase torque but lower RPMs. Conversely, making it looser (bigger radius) increases RPM but lowers torque.
  20. V

    Calculating Motor Requirements for Gearbox Design

    hi i am designing a gear box and i need help on calculating my motors requirements. i have a motor with rotating a gear which is connected to shaft using a gear attached to the shaft. on the top of the shaft a cylinder base is screwed weight X kg. could you please help me thank you
  21. 3

    Making a DC motor speed question

    I've made a simple DC motor like this image: http://farm4.static.flickr.com/3156/2864655414_234d5d3207.jpg I'm just confused why initially when i increase the number of loops (about 15) it spins faster.But after this limit the speed of the rotor is no longer as fast as it was before. Why...
  22. P

    Load on an electric motor vs. current draw

    According to classical physics, if I take an electric motor with a resistance of 1 ohm, and run 10 volts through it, 10 amps of current will run through it. But through experiment, a lot less current will run through the motor, an average brushless motor with a resistance of less than a milliohm...
  23. T

    How to model vibration motor in mobile phone

    Hi, I am working with the vibration motor in smartphone. I want to calculate to force comes from the vibration motor through time. In this case, I only measure the force in 3 direction, like x, y and z axes. I expect it has sinuous form but I don't know exactly the mathematics equation to...
  24. R

    Electric Motor Design? Learn How in EE School Classes

    I've been looking at the undergrad catalog of my school and I haven't noticed any classes that teach motor design. I found classes on drives and motor control but nothing on the actual design of motors/generators. I always thought electric machines was a fundamental topic that all EE curriculums...
  25. I

    What is doing the work in the motor effect?

    When electrons move through an armature, the magnetic field produced by the current interacts with the magnetic field it's moving through. This interaction causes a repulsion which produces the spinning of the armature in a motor. Would someone please explain what is doing the work in...
  26. Z

    How to calculate Torque for motor?

    Hi, I am doing a self-balancing skateboard. It uses two 24v motor to move two wheels. I need to know if my motor will be able to move the wheels. Given that, wheel of 5.66 inches. The total weight of the skateboard = 13kg. Assume human mass = 80kg. Total weight with human mass = 93kg...
  27. 2

    Electromagnetic motor using battery and magnet?

    I've been wondering how does this motor work (if it is not hoax in the first place) I was thinking about Ampere's force but apparently it doesn't really have an affect here. Any ideas?
  28. S

    MOTOR Help: Choosing the Right Motor for DIY Project

    MOTOR Help! Hello Everyone, Please help regarding my DIY project. I want to make a Camera Glider/Slider which has to slide my 2-3 KG camera Horizontally, Inclined-ly as well as Vertically (Straight Upto 2 Meter High) using a Motor and a Belt. Here is the picture my project...
  29. N

    Forces Involved in an Electrical Motor According to Newton's Law

    Hi Everyone. I've been trying to build an electrical motor and would like know the method to actually calculate the forces exerted on several parts in the motor according to Newton's laws. I've attached some pictures and drawings of the motor I'm trying to build. There are two scenarios that...
  30. 3

    Make a DC Motor: Tips to Increase RPM to Over 5000

    Hi there Currently in my physics class my teacher has assigned us a project where we are to make a DC motor using these items: 2 thumbtacks 1 meter of 14 AWG copper wire 2 paperclips A block of wood 1 ceramic magnet 1 AA battery 2 connecting wires My plan is something like this...
  31. beyondlight

    Engineering Controlling DC Motor using DC-to-DC Converters

    Homework Statement We have a small car that is powered by a battery that feeds a DC-motor. The system consists of two DC-to-DC converters that controls the rotor and stator current. The DC-motor i separately magnetized. The purpoce of the DC-to-DC converters is to modulate the time the...
  32. O

    Finding the Right Fuse for 24V DC Motor Application

    I have an application where I am using a 24V DC motor to drive a ball screw. If someone isn't paying attention and they hit the mechanical stop on the ball screw, the current is going to spike to about 200 Amps. The normal running current is about 35 amps, and the max current is 60 amps...
  33. F

    Looking for a comprehensive servo motor book?

    Hi, I'm wroking in a project about robotics that uses servo motors. Can someone recommend me a book that completely detail how a servor motor work. If it includes robotics would be great. Thanks
  34. S

    Can I get a 40KN force from a hydraulic cylinder powered by an electric motor?

    Im thinking of designing a tipping trailer for a car. I need a force of 40KN exerted to tip but would this be too much for driving with an electric motor powered by the car battery. If not what size of motor and pump would I need? thanks
  35. X

    Engineering Understanding Electric Motor Coils and Direction: Exploring DC Motor Theory

    Homework Statement Why must the coil in an electric motor kit be wound in only one direction? Why must the current change direction every 180 degrees in the motor? Homework Equations No relevant equations. Just a simple answer. The Attempt at a Solution NI-Prentice Hall DC Motor...
  36. B

    Induction motor load estimation from a variable resistive load

    Hello, I'm trying to find out how much energy an induction motor pulls over a 24 hour period when connected to a resistive load. The only data I have are the specifcations of the motor, so I can estimate how much energy it will draw based on what capacity it might be running at. Really...
  37. J

    Need help with motor sizing/torque calculation - Building a Ski Rope Tow.

    I am building a homemade ropetow in my backyard. I have done a lot of research and unfortunately I have been away from physics for about 15 years, so I am having trouble calculating my motor size and transmission options. I will lie out what I am trying to accomplish below. Here are the...
  38. J

    Building a Ski Rope Tow. Need help with motor sizing

    Need help with motor sizing/torque calculation - Building a Ski Rope Tow. I am building a homemade ropetow in my backyard. I have done a lot of research and unfortunately I have been away from physics for about 15 years, so I am having trouble calculating my motor size and transmission...
  39. M

    Induction motor - no load speed

    Under no load, does an induction motor run exactly at its synchronous speed (i.e. relative field speed) or at a speed that is close to the synchronous speed but slightly less? Thanks for your time.
  40. beyondlight

    Engineering The torque curve of a indcution motor (laboration task)

    Homework Statement I have to measure the entire torque curve and stator-current of a inductive motor from idle running speed to 0 rpm. This will bee done for 130 V instead of 400 V because the energy loses will be too high if it is done with a stator voltage of 400V. Question: How does the...
  41. P

    Engineering Calculating Slip and Number of Poles in Induction Motor

    an 8 pole 3 phase alternator is coupled to a prime mover running at 750 rpm.it supplies an induction motor which has a full load of 960rpm find the number of poles of the motor and the slip i think the induction motor would work as a generator we can find slip by usin s=(ns-nm)/ns where...
  42. EVriderDK

    Ok, but WHY does the asynchronous AC induction motor have an unstable zone?

    I have been tought several times that if an asynchronous induction motor is overloaded, so that the rotor speed goes below where the maximum torque point is, the motor will become unstable, and simply stall, even if you unload it. Why does it do that? fx. here...
  43. W

    How to calculate reactive power for 3 phase induction motor

    Hi all, I would like to install Capacitor Bank into my control panel board which contains of few 10HP induction motors. Currently I'm just able to measure the Ampere for every induction motor by using current meter. How to calculate the reactive power for 10HP 3phase 4pole induction motor by...
  44. A

    How to build a simple AC motor with Styrofoam

    Hello everyone, For my physics class, I want to build an AC motor with styrofoam, magnets, screws and magnet wire. So far, I have built a cylinder of about 2.5" of radius and 1" in height with eight magnets (strengh 6/10) around it. Each magnet is glued on the side of the cylinder...
  45. A

    Motor Stopping - Find Reason & Fix

    hi, i have a motor conected to mcu via h bridge but it stops rotating after few minutes.may i know the reason for this. thanks
  46. N

    Electric motor efficiency calculation

    Hello everyone, I am trying to calculate the electric efficiency of some 3 phase electric motors but I am a little confused about the power factor. efficiency=work out/work in work out=rated W of my motor (hp*745.7) work in= V*A*PF*√3 Is the work in correct? Thanks
  47. M

    Is it possible to power a freight train with an animal motor?

    The question is whether freight could be hauled along train tracks using only beasts of burden as a power source. My first ideas of a design involved tying, say, horses, to a belt which would drive a shaft, and, through simple gearing, provide power to push the train forward. The first few...
  48. T

    80W of Power Cannot Be Converted to Energy

    Is this problem as simple as I think it is? Homework Statement A 532 Watt motor is 85% efficient. How much power cannot be converted to energy? Homework Equations The Attempt at a Solution 85\% of 532W\,=\,452.2W 532\,-\,452.2\,=\,80W
  49. G

    Electric motor temperature sensor locations

    Hi guys, I'm trying to design a brushless motor for an EV with temperature sensing for both the copper coils in the stator and the permanent magnets in the rotor, but I'm not sure how to add a temperature sensor on the neodymium magnets in the rotor. Wouldn't the high levels of varying...
  50. M

    Pulley, Motor and Weight Torque Problem

    Pulley and Motor - Torque Problem Homework Statement When the motor in the figure below lowers the m = 1140kg mass, it produces a tension of 1.04E+4N in the cable on the right side of the pulley. The pulley has a moment of inertia of 79.7kgm^2 and a radius of 0.741m. The cable rides over the...
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