Motor Definition and 1000 Threads

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. Noaha

    Rotor and stator flux in 3 phase Induction motor

    The rotor and stator flux speed are stationary with respect to each other in 3 phase induction motor. What will happen if there is relative speed between them? How these two fluxes interact with each other to develop a torque?
  2. marcophys

    DC12V 12A car window motor - what spec for a 220V PSU?

    I have a combined motor and screw drive (to 90 deg). It's original purpose was to convert car windows to electric drive... my guess is that it is at least 25 years old, and made in Japan. For scale... the width of the motor casing is 50mm (as you look at it) I'm making a motorised turntable...
  3. yrjosmiel

    What are the advantages and disadvantages of n-pole motors?

    From what I've understand now, it is like in a brushed DC motor, the more poles you have, the less RPM but higher torque. Can anyone confirm?
  4. P

    Clarification of the motor rotor position

    I was referring to the following statement in the document which confused me and also attaching the document for your reference. "First, we need to know the rotor position. The position is typically related to phase A." How the above statement is true. Please help me to understand. I am...
  5. bachir1994

    Current and voltage relationship in an electric motor

    Hello, I can not understand that a motor (pumping) requires a current of 63 A under a voltage of 390 vac, and requires a current of 72 A under a voltage of 365 vac. Normally when the voltage increases the current increases with (ohm law). Is that the power delivered by the engine which is 37 kw...
  6. D

    Diagnosis of large brushed DC motor

    Hi everyone, just found these forums and had a look around, there's some great info here! I usually deal with the run-of-the-mill industrial three phase motors so this is not my strong suit so please bear with me here. I have a large DC motor here that was brand new but failed after about 2...
  7. A

    How to find the torque constant of BLDC motor?

    Hello Friends, I have used in-wheel BLDC motor for my experiment. In this type of motor BLDC motor inbuilt on wheel. This wheel is a part of electric scooter. I wated to find the value of torque constant and back emf constant. Also how to measure torque for a selected current. Please help me...
  8. J

    Replacing a diesel engine with an electric motor

    Hi all, I have a little project on my hands and I will go into a little detail to help everyone better understand. I built a mobile boutique out of a shuttle bus for my fiancé to run her business out of. There is a large rooftop air conditioner on top of the roof for cooling and the...
  9. P

    3 phase motor net magnetic field

    I am trying to understand the basics of bldc motor. My question is if i am driving the 3 phase motor with sinusoidal waveform. The magnetic field is produced for each phase or it will add together to generate net magnetic field? How to get the net magnetic field.
  10. ckcurtis

    500cc 50hp electric motor swap

    Hi, I own a 1993 ex500 with that is having engine problems, I would like to swap the motor for one that is has more or equal power. The best specs I can come up with are these the motor puts on the rear wheel, HP 50, Torque 31 ft-lbs, top speed 130mph, I am looking into getting a DC-liquid...
  11. F

    Solving Motor Rotation: 0 to 1800rpm in 0.49s?

    Homework Statement The rotor of an electric motor weighs 10 pounds and is 4 inches in diameter. What is the length of time required for the motor speed to increase from 0 to 1800rpm, assuming a constant electrical torque of 20 in-lb and zero external load during this period? Assume the rotor is...
  12. R

    Determine the sum of the windage and friction losses for this motor

    Hi I was wondering if someone could tell me the equation for finding out what the windage and friction losses are based on the information below. I've drawn the graph and I can work out the I/0, R0 and X0A four-pole, star-connected, squirrel-cage induction motor operates froma variable voltage...
  13. B

    How Did WEG Achieve IE4 Efficiency with Aluminum Rotor Cages?

    Hello, is there anyone who knows how WEG managed to get IE4 efficiency rating for their motors while keeping Aluminum for cage on rotor? http://ecatalog.weg.net/tec_cat/tech_motor_sel_web.asp# Best regards
  14. P

    Calculating Belt Pull, Drum Torque, Motor Power & Speed

    Homework Statement Calculate the Belt pull, drum torque, motor power and speed required to drive a flat top belt given the following information: Belt centres are 4.0m Required speed is 18m/min Drum diameter is 300mm Belt mass is 3.0kg/m Belt is fully loaded with 32kg boxes 0.8m long Belt...
  15. C

    Physic project -- DC motor with electromagnets

    1. The problem statement, all variables and given I do not have a clue where to get the information to built a DC motor with four electromagnets Homework EquationsThe Attempt at a Solution
  16. E

    Experimenting with Windings: Maximum Voltage Output?

    I attach an image of something I am experimenting with. The picture itself (and added text) should be self-explanatory. 1) Which way should my windings (clockwise or counter-clockwise) go around P1; P2; P3 & P4 for maximum voltage (V) ? [ 1 Ø ] [ 1 x single enamelled copper conductor ] [...
  17. O

    Cost of 41kW Motor for 32 Weeks: $17,633.28

    Homework Statement If I calculate that a motor needs 41kW continuously throughout a day to run, and it costs $0.08 per kWh to run, to calculate the cost of this for 32 weeks, I would do 41 x 24hours x 7days x 32weeks x $0.08 = $17633.28 is this a correct way of working it out?
  18. D

    Will a router motor have permanent magnets?

    Settle a bet: A reasonable sized (believe it is 2HP) router will not have any permanent magnets inside it upon tear-down. Instead, it uses an electromagnet. Correct?
  19. T

    VSD for induction motor maximum current

    Hi, I'm trying to ascertain when you're driving an asynchronous motor with VVVF or whatever else a VSD uses, when do you draw the most current? For instance, say you're talking about a train/tram: I would have thought intuitively that since power = torque / angular speed, that starting up, to...
  20. Waggles

    Renewable Energy Concept - Stirling Engine Composting

    So I've got this crazy idea. To put it simply, to use the heat from anaerobic composting to power hot-air engine, specifically a Stirling Engine. Based solely on my own reading, the center of a closed composting heap can reach anywhere from 120-160 degrees without killing the microorganisms...
  21. marciokoko

    How far will a toy car travel with a small rocket motor

    I want to strap an estes b4-4 rocket to a toy car and calculate how far it would travel. What I know: Mass of car: 300 grams Rocket nominal force: 12.8 Newtons I think this means the rocket would accelerate my car for a=F/m = 12.8 kg * m/s^2 / 0.300 Kg which means 12.8 m/s^2/ 0.3 = 42.67...
  22. A

    What HP/torque Electric Motor to lift 1K lbs w/ sprokets

    I am building a lift using 4 threaded spindles and sprockets to travel 12 feet. The motor needs to have 56 mount as it will be mounted vertically (Shaft down) attached to a sprocket that drives a chain to the 4 supporting sprockets. The load (1,000 lbs, 250 lbs at each corner) will be lifted...
  23. D

    Calculating Pulley Size for Band Saw Motor

    0 / 0 Hi all I am trying to find the diameter for a pulley on a drive motor for a band saw the motor turns 2800 rpm the next pulley is 11 1/2" away that is 5" dia on the same shaft is the band saw wheel which is 10" dia and must turn 900 rpm . any help would be great. Doug.
  24. G

    What types of motors does Nidec America manufacture?

    I am the manager of Advanced Product Development for Nidec America. We manufacure high efficiency motors for many applications ranging in size from a few millimeters to to a few meters in diameter. Primarily our motors are PM BLDC type. My school is Syracuse (Go Orange People!), I am in my sixties.
  25. S

    Electric motor: power and RPMs

    I am helping a friend with a project, and am wondering if this statement is true. "To double the RPMs of a central drive shaft motor, you must quadruple the input." In other words, if an electric motor being supplied with 1 Watt spins at 500 RPMs, one would need 4 watts to spin at 1,000 RPMs...
  26. MikeTownsend

    DC motor voltage recommendations for a bike and power tools

    I have been working on some projects, I build a glass grinder, faceter with a 120v induction AC motor. Its not possible to effectively change the speeds with electronic controls being a single phase motor. It is using belts and pulleys for now. So I am wanting to build several tools, rock...
  27. Vikas Kasireddy

    Single Phase Induction motor winding phase difference

    Q1: So I'm trying to extract the electrical properties of a single phase induction motor. First off, how am I supposed to measure the phase difference between the start and run windings? I have L and R of start and run windings too! Q2: I have a torque vs slip curve up until 130% of rated load...
  28. A

    How to calculate large DC motor efficiency?

    What are the two methods for calculating large DC motor efficiency ?
  29. Nick Goodson

    DC Motor Speed Increases Under Load - Modeling w/ Simulink

    Hi, I am modelling a DC motor using Simulink. Under no-load conditions, I get a max speed of 180 rads/s, but under load, the speed goes up to 290 rad/s, although takes longer to reach max speed, acceleration decreases. I have a mechanical background so don't know much about motors, but would...
  30. Paul Glavey

    Need Help Calculating what Motor and Gearbox I need (building myself a Trommel)

    Hello I recently got into veg gardening. I have a lot of good soil but it needs to be sieved to remove rocks and other crap from it. I decided to build myself a Trommel based on this article http://www.popularmechanics.com/home/how-to-plans/... But I decided to make a more robust version of...
  31. B

    DC Motor Controls: Get Help for Layman's Terms

    Okay, this is probably going to be way below your pay grade, but bear with me because I know nothing about electric motors except that you plug them in, turn the switch, and they work. I've seen some instances where people have taken DC motors from treadmills and used them to power lathes and...
  32. P

    Make a Monophase AC Motor Run: 3 Speeds Fan w/ Digital Logic

    Hey, everyone, I got this motor from my fan, I am trying to run it but there are a few more wires that I was expecting. Can someone please give me some light? What are all those wires and how to make ir run. PS: 3 speeds fan w/ digital logic on the top (taken off)
  33. B

    Is this a valid way to measure the Back EMF of a DC motor?

    While the motor is spinning, I measured the voltage (Vrm) across the motor by connecting the two probes from the multimeter to the two terminals of the DC motor via alligator to alligator banana cables. Since the current was fairly constant, I could ignore the inductance. So, no voltage across...
  34. B

    Is the torque constant of a DC motor the same regardless of voltage?

    Hi, we know that the speed varies inversely with the torque. The more the torque, the lower the speed. From torque-speed curve, we can calculate the slope. When the applied voltage increases, the straight line shifts upward while when the voltage decreases, the straight line shifts down. How...
  35. R

    DC motor running in reverse after repair

    Hi all, so my mercury 25 outboard starter was starting to give it up. I took it apart, and yup, the brushes were badly worn. Well, I have several generic brushes kicking around, so I simply swapped them out. Very simple operation. And yet after assembling the damn thing, it now runs backwards...
  36. L

    How to attach wheel to axel? and how to choose motor

    I need to know how to attach a wheel to an axel, but first of all, i need an axel with a gear pre-built into it. The axel needs to be over 20 inches long (because that is the width of my vehicle) and support bicycle/tricycle wheels. Does anyone know of such wheels and axels? (The wheels have...
  37. Manoj Sahu

    Why DC series motor should not be started without load?

    Today a professor of mine who teaches Electrical machines told us that a DC series motor should not be started without load. I wonder why is that so. Please provide a detailed explanation of this PF members. Thank you very much in advance.
  38. B

    Measuring motor resistance and speed of a geared DC motor

    Hi, I want to measure the motor resistance of a gear DC motor by experimentation and Ohm's Law. Should I measure the current without the gear head, with the gear head, stall current (with gear head) or stall current (without gear head)? I am trying to obtain values for Equation 4 in...
  39. A

    Synchronous Machine Voltage Curves & Torque Relation to Armature Current

    Hello everyone Im new on the forum and I just discovered what are sync machines... I have really basic question what I still cannot figure out.. I did some experiments with motor for different field currents and torques. In the result I measured armature currents and did V curves. But next...
  40. B

    Circuit that reverses the flow of current to a motor

    Hello, I am building a small car that upon hitting a wall will go backwards, in other words reverse the current flow. I have all the components requiered (resistors 3k and 1k, wires, 6V battery, and an H-bridge, locking button) only thing I do not know is how to connect them all together. If...
  41. A

    Automotive How Do Coaxial Rotors Function with One Motor?

    hi guys, i don't really have a good background on mechanical engineering so i was hoping that someone would help me. i don't really get how coaxial rotors work, i saw a couple of videos and read a couple of papers on it but what i don't get is that can one motor rotate one shaft in opposite...
  42. B

    Can I acquire the shaft position of my motor using my VFD

    The project I am working on is to design the control system for a shock dynamometer. I am using Labview and communicating to the VFD using Modbus. The shock dyno will look a little something like this; So one of the main objectives in my project is to produce a plot as seen below; The...
  43. B

    Model DC Motor: Torque, EMF, Resistance & Regulation

    Hello, I want to model a DC motor which I bought from a company. I only have the following information: torque constant [M.N.M./Amp], EMF constant [MV/RAD/SEC], Dynamic Resistance [OHMS] and Motor Regulation [RPM./M.N.M.]. The company does not provide the moment of inertia nor elect/mech...
  44. Asher Kabir

    How can I teach how a motor works to students effectively?

    I'm a physics teacher and I've found it hard to explain motor's working to a couple of students.
  45. A

    Where to place fixed axis of rotating motor

    is there a fixed angle between the fixed axis of a motor to the torque applied opposite to the motor rotation? an example is if i am using and electric screw driver to rotate a spiral screw in stable piece of wood on the floor, what should be my fixed frame if the screwdriver is I shaped and...
  46. T

    Finding Torque Without An Angular Acceleration (stepper motor)

    A friend of mine posed a question to me the other day and I can't seem to wrap my head around it. He's working with an electric stepper motor to turn a large thin disk, but he can't be sure of the torque required because to find the torque he needs the moment of inertia and the angular...
  47. cnh1995

    Zero sequence braking of induction motor

    I recently read about zero sequence braking of induction motor. In zero sequence braking of induction motor, the stator phases are connected in series and a single phase ac supply is connected across the series combination. Thus, the currents in all three phases are co-phasal, which are called...
  48. Arezriq_

    What are the best DC motors for moving heavy objects?

    what type of DC motors that can be use for moving a heavy object ?
  49. B_Mulcahy

    Can a Motor be Converted to a Dynamo and How to Do It?

    Hey, I understand that essentially a dynamo is the inverse of a motor however I was wondering if I could have a little more detail on the subject, how exactly can you convert a motor to a dynamo? Is it as simple as turning the motor and wiring it up to an output to create the current or do you...
  50. N

    How large of a flywheel can my motor spin?

    Hi All, I'm hoping you all can help me with what I think should be some relatively simple calculations. I'm looking to determine how large (diameter / weight) of a flywheel a particular AC motor can spin from a stop to full RPM given the torque / HP of the motor. For instance, if I have a 1/3...
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