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.

View More On Wikipedia.org
Recent contents Top users
  1. Peter8899

    Using a Servo motor as load on a system

    Can a Servo motor (or any electric motor) be used as a load on a system ? meaning can it reprisent for example a certain dead weight ? If we had a motor driving some gears connected to the shaft of the motor, In order to apply a certain load on the system could i put another motor on the other...
  2. D

    Difference between ESC and brushless motor controller?

    This is a 2 part question and I guess it applies to the brushed case as well. 1.What is the difference between an electronic speed controller (ESC) and a brushless motor controller show below: ESC: http://www.robotshop.com/en/lynxmotion-12a-multirotor-esc-1a-bec-with-connectors.html Brushless...
  3. A

    How Do Gear Ratios Affect Stepper Motor Performance in Lock Systems?

    Homework Statement The number of teeth in the dial gear of the combination lock system is 40 The number of teeth in the stepper motor gear of the combination lock system is 10 The number of teeth in the dial-stepper connecting wheel of the combination lock system is 80 1) What are the gear...
  4. H

    Small DC motor run by a super capacitor - Is it possible?

    I'm doing a project where I need to hand power one small, dc motor (1.5-12V) and charge a 1F 5.5V super capacitor, and then use it to drive another small 1.5-12V dc motor. Does anybody have any suggestions for motor specifications or circuit elements that will help me get the most efficiency...
  5. A

    Incremental rotary encoder motor help

    Homework Statement Hi please see the image that I have attached. The text colored in red is the data I need to calculate. Homework EquationsThe Attempt at a Solution The encoder has 128 counts per revolution So to calculate corresponding angle change this I what I did I divided encoder count...
  6. Z

    Is the coil the only viable shape for an electric engine ?

    Hi, I'm an hobbyist right now I'm into electric engines, simple engines for low voltage and low current applications; I have noticed that there are many variations about how and what an electric engine can do even considering only DC motors, but basically all the engines that I have examined up...
  7. N

    Changing motor speed with external magnets

    In the below video it is shown that rpm is increasing by using external magnetic field . can i know on which principle it is based on?
  8. N

    Will External Magnets Affect PMDC Motor Armature Rotation?

    generally in the pmdc motor the armature will rotate.As it works with the help of magnets ,if i provide external magnets to motor ,there will be any change in the rotation of armature?
  9. ranju

    Engineering What is the role of rotor bars in single phase induction motors?

    Homework Statement I studied that as the single phase motor speeds up the backward induced field currents are larger than the forward field currents. So , the corresponding opposing rotor mmf causes backward field to be greatly reduced whereas the smaller forward currents leads to enhancement...
  10. William123

    Built an electric motor but missed something

    Hello! I haven't read all that much about electrical engineering in school yet but I decided to build an electric motor since I enjoy doing this stuff. The problem is that when I connect it to an 11.1V battery that I had lying around, it just spazzes a little bit but it won't turn. I'm also...
  11. I

    Determining the number of gear teeth?

    I have a system that consists of a shaft and two selected gears. I want the shaft to be rotating at 250 RPM and to deliver an input power to the system of 850W. The input torque at the shaft is 71Nm. How can i use this information to determine how large my driving and driven gears will be...
  12. A

    Low rpm motor and heating element in 250 W

    i wanted to know if it's possible to run a heating coil which reaches some 300 C and a dc motor of low rpm of some 10 or so...and all this under 250 W??
  13. W

    Most efficient way to rotate a cylinder using a motor?

    This is my first post on these forums, and I was hoping someone could answer a question I have. For my high school engineering course, we spend most of the year developing a solution to a problem of our choice. We are currently developing a composting tumbler that will turn automatically several...
  14. M

    Serial controlled variable speed motor

    Hello all, I am trying to create a circuit that allows me to use serial data to control the speed of a 12v dc motor I removed from an electric drill. So far I have successfully made the circuit in diagram (a) using a 100k pot to alter the speed. So the next problem to solve is how I can instead...
  15. deckart

    Build a 48 VDC Generator with a 50 hp electric motor

    You can select any type of motor. I'm going to spin it at a varying RPM and with a varying torque. The combination of torque and RPM will be capable of 50 hp intermittently. I can limit the maximum RPM but lower is better as I can leave out a gearbox. No different than what they probably use in...
  16. N

    Engineering Calculating Power Loss and Input for a Permanent Magnet DC Motor

    Homework Statement A permanent magnet DC motor has an armature resistance of 0.4 Ohms. When a voltage of 110 V is applied to the motor it reaches a steady-state speed of rotation of 126 rad/s and draws 39 A. (a) Find the power loss in the armature (b) the power input to the motor I really...
  17. N

    2000 kg boat, motor force of 6000 N, resistance 2000 N

    Homework Statement A 2000 kg boat's motor can exert a force of 6000N. The water provides a resistive force of 2000N. What is the magnitude of the acceleration. Homework EquationsThe Attempt at a Solution that the boat has a 4000 N total force going foward
  18. cnh1995

    Rotor EMF in squirrel cage induction motor

    In a 3 phase induction motor,when stator rmf rotates, it cuts the rotor bars and induces an emf in them. Is this emf sinusoidal? I mean shouldn't it be a square wave since the rotor "bars" are being cut by the flux, like in case of concentrated stator windings of a synchronous generator? If the...
  19. Aspirant

    Help with Motor voltage/torque for 12 Newtons of force....

    Hello all, I'm going to get right to the point! My current project is a motor-retracted spring-loaded toy lightsaber. I started with one of those spring loaded lightsabers that spring out at the touch of a button... but it had the annoying immersion problem that in order to re-load it, you had...
  20. M

    Is a Torque Arm Necessary for Installing a Radial Hydraulic Motor?

    Hi, is it really needed to use a torque arm for installation of radial hydraulic motor? what if I only used its flange connection to put it in the system? is there any risk?
  21. S

    What is the required current for maximum torque in a 33 kg cm servo motor?

    I have recently purchased this servo motor ,which has rated stall torque of 33 kg cm at 6V. Statical current :16 mA Stall Current: 3+0.6 AOur technical query is,in order to obtain the maximum torque..what current do we need to be able to supply it Is 16 mc sufficient..or we need 3.5A?
  22. J

    Engineering Magnetising circuit parameters in a 3ph induction motor

    Homework Statement Homework EquationsThe Attempt at a Solution Stator Line voltage 220 164 112 88 42 Stator Line Current 6.8 5.4 3.9 3.8 3.7 Stator power 470 360 278 244 232 By plotting a suitable graph from these results, determine the total of windage and friction...
  23. A

    Calculating force during motor stoppage

    When a motor with a flywheel spins up and then stops, what is the force translated on the surface onto which the motor is connected? I'm assuming the value of this force equals to the centripetal force in the flywheel, but I'm not sure. The setup: http://imgur.com/IiOrRoQ How does the force...
  24. J

    Electrical reason for big air gap of induction motor

    in induction motor there is air gap between stator and rotor. the air gap needs to be as small as possible. but some air gap is needed for mechancial reasons. i understand that a big air gap would reduce power factor as you'd need more magnetizing current. but are there any advantages of big...
  25. S

    Stepper Motor Working: Benefits & Challenges

    Hey guys, I am planning to use a stepper motor for a project of mine(Auto clutch system) I would like to know if the stepper resists rotation if the power supply to it is cut,as this will be useful when we decide to shift the clutch to our control.
  26. V

    How Can I Safely Extend the Shaft of My Motor for Encoder Installation?

    Hi, I have this motor with me, http://www.etonm.com/products_detail/&productId=46.html What I want to do is mount an encoder at the back side of the output shaft of the gearbox. I am trying to figure out how to extend the motor shaft in the rear side. The encoder I am fitting will be optical...
  27. PhiowPhi

    Types of opposing forces in a generator, and a motor

    I keep going back to this, but I get confused when imagining everything. I'll start off with a motor: Basic set-up fixed magnets of a uniform magnetic field and a conductive armature that has current flowing, the armature experiences a torque(due to the the Lorentz force), and the armature gains...
  28. cnh1995

    Why Does Torque Increase as Slip Decreases in a Single Phase Induction Motor?

    Single phase motor is not self starting, so it is started using some arrangement and the starting arrangement is disconnected(not always) once the motor is set in proper motion(about 70% of the maximum speed). But I didn't understand this graph. From the starting moment, motor accelerates and...
  29. T

    What Happens to Flux in an Induction Motor When Short Circuited?

    Just a curiosity about what happens to the flux, when you short circuit an induction machine. Say there is an initial flux and you're rotating the shaft of an IM and then you short circuit the stator, so no doubt you'll get large currents in the stator, but those large currents, will they cause...
  30. L

    Counter emf generated in a motor at full speed

    Homework Statement An electric motor draws 20.0 A of current when first switched on. The motors windings have a resistance of 5.0 ohm. Once the motor is up to full speed it draws only 4.4 A of current. Calculate the counter emf generated in the motor at full speed Homework Equations I = V/R...
  31. T

    How to Control Slip in Induction Machines?

    Hi, Say you wanted to have a generator or motor stay at near 90degrees for maximum torque while generating or motoring, over various loads or over various supply frequencies. I assume there is some established method of controlling this (varying the rotor resistance with feedback perhaps?) does...
  32. K

    Expert Tips for Choosing the Perfect Motor - Maximize Your Design's Performance

    Hello, I am working on a design, and I am having trouble selecting a motor. I will be able to supply 1.2 A and 12VDC, and I need the motor to be able to move a load of 0.5 lbs at 500 rpm. So far, I tried calculating torque (based on F=ma and T=Fr, r=1.06 in in this case). Then I used HP=...
  33. B

    Rotational force of motor + potential gear reduction

    I'm trying to determine how powerful of a stepper motor I need for a project. I am attempting to take a display that weighs 15lbs and transition it from laying flat to inclined (approximately 45 degrees) using a stepper motor. I had considered a linear actuator since it would have been an easier...
  34. R

    Measuring torque acting on motor shaft?

    I have an electric motor that I am using to turn an auger to dispense pet food. I want to measure the average torque required to turn this auger at a given rpm. I know Powerin = Voltage into motor * Current into motor and Powerout = Torque exerted by shaft * RPM of auger and Powerout...
  35. K

    Power by Motor on Pulley System

    Homework Statement Homework Equations P = T*V F=ma 3. The Attempt at a Solution [/B] My approach was this: Using the pin at C as a datum, I figured that DB=CD and thus 2CD + AC = l. Thus I figured that at 3 ft/s, A was rising 3/2 feet per second. However, I also figured the it would...
  36. K

    Work done by motor against gravity

    Homework Statement Homework Equations Conservation of Energy: ∑T1+∑U1-2=T∑2 The Attempt at a Solution ∫[/B](600+2s2)ds - 100*9.8*15 = (1/2)mv2. However, the term of work done by the force is less than the term of work done by gravity! The book has a solution, which is exactly this...
  37. V

    What Are Parallel Paths in DC Motors?

    The torque equation for a DC motor is: T = (P.Z.φ.I)/(2.π.A) Where: P = no. of poles Z = no. of winding conductors φ = flux per pole I = current A = no. of winding parallel paths My question concerns the "parallel paths". What are "parallel paths"? Why do they reduce the motor torque...
  38. T

    Very simple name-plate question

    If a motor is such-and-such Hp or kW, is that the Output power, or the Input power?
  39. cnh1995

    Understanding the Formation of 4 Poles in an Induction Motor

    I've studied a 2-pole IM with its winding diagram and understood how the two poles are formed. But I'm struggling to understand the same thing about a 4-pole motor. How does this winding arrangement result into 4 poles?
  40. I

    Can I Control a 2-Way Motor and Change Direction without an Arduino?

    how can I control 2-way motor, to be specific I want to change direction after few rpm, is it possible to do it without arduino
  41. A

    Load Acting on Robot Arm Driven by Electric Motor

    Hello all I have a doubt with the load concept acting on a beam. Consider a robot arm, actuated using Electric motor. When the arm is static and hold in position by the motor, Does the Gear ratio reduce the load acting on the motor due to the Gear ? Or when the arm is static, the Gear system...
  42. 6

    What's this thing on my electric motor?

    Just got this beautiful old pump from a fleamarket. Does anybody know what the tube shaped thing connected to the motor with a cable is? It goes into some box on the side of the motor. The close up shows the only inscription on it.
  43. D

    How do I know how much this motor is putting out?

    Hi Just wondering if someone could help me! I need to know how much torque and RPM a motor will output for a given load (0.75kg), the only information I've been given is how the RPM and current vary with time for 4 different flywheels of masses 118g 166g 208g and 337g! the dyno test datasheet...
  44. Physics GOD

    How Can Torque Be Increased in an Electric Motor?

    Can someone tell me if the parts of what I've done are right, and explain the questions I've missed. We have just done a lab on split-ring commutators and I'm currently doing a lab report. "Explain what is meant by the torque of an electric motor. Use a diagram" I've said that 'The torque of an...
  45. D

    Power consumption in KWH of motor

    Homework Statement Hello Everybody, When i was searching for power required to lift an object, i found that:- For Example, Q :- 100 kgs to be lifted 3 metres in 5 seconds. (vertical) A :- Mass * Gravity * (Distance / Time) = 100 * 9.8 * (3/5)...
  46. Salvador

    Need help understanding strange idea (electric motor rotor and stator)

    A dc brushed motor with a commutator, the stator isn't fixed to anything and is left freely on a desk for example, now apllying power the rotor starts to turn, if I take the rotor and hold it with hand the stator now starts to turn around , I assume this happens because the stator poles and...
  47. Salvador

    Slip rings, commutator, dc motor

    If I'm not mistaking , all DC and also universal motors have a brushed commutator not a slip ring commutator because the rotor wires need to keep the same current direction as they rotate pass the same magnetic stator pole. so the only DC motor which could operate on slip rings is a homopolar...
  48. R

    Increase Torque on 10 HP Motor Without RPM Change

    Howdy! I have a 10 hp motor on a machine but it's only using 3 hp while it's running. The output shaft of the motor is connected to a bigger pulley to spin a wheel. Is there any way to increase the torque at the wheel while maintaining rpms? My first thought was to use more of the motor power...
  49. G

    Wanting to run the following motor using a 12V (car battery)

    I am hoping to run the following motor using a 12v (car battery). This battery would run until a charge is needed Just curious on what's needed for an Inverter and how easily/cheap it could be accomplished.. Motor specsFHP-Motors 1~mot. 100w 115v 50/60 MHz I'm novice in...
  50. E

    Engineering Basic calcs in excel for dc lap wound motor

    Homework Statement My group and I have to design a lap wound dc motor. Maximum of 12 volts and 5 amps. Must have no more than two poles. The aim is to achieve maximum efficiency. I've created this excel spread sheet to calculate the gauge of wire we need and the type of magnets. Also how...
Back
Top