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.

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

    AC synchronous motor power factor

    Is it true that AC synchronous motors (the ones with the DC slip rings and excitation current running into rotor poles) have a power factor of 1.0 when they run in synchronous mode? Would that be because with sufficient rotor DC current he rotating AC magnetic field is precisely counterbalanced...
  2. M

    What causes a motor to burn out?

    How is motor speed regulated (lets say a PM DC motor)? Is the voltage kept constant, and current increased/decreased, or is current kept same and voltage increased/decreased or both? What about torque and speed? Will giving a motor too much voltage or current damage it? I'm trying to...
  3. B

    Rotating reel with load driven by a motor

    Homework Statement If the motor M exerts a constant force of P = 300 N on the cable wrapped around the reels outer rim, determine the velocity of the 50 kg cylinder after it has traveled a distance 2 m. Initially the system is at rest. The reel has mass 25 kg, and the radius of gyration about...
  4. duhuhu

    Can you damage your starter motor with too much current?

    Hey all! Today I took my car to the shop for some starter issues. They told me that the starter had been damaged by a battery with a higher CCA rating than was safe for the starter motor and it burned out my motor slowly over time. I feel like they may be BS'ing me, but I'm not sure. I know my...
  5. J

    Engineering Single Phase Induction Motor -- 2 Questions

    Homework Statement Question 2 Homework Equations Flux time lag depends on L/R ratio. More resistance, less time lag. Single Phase IM---Double Revolving field theory The Attempt at a Solution For 1st question, I think answer should be A. BB circuit has more resistance so BB Flux will have...
  6. E

    Air motor: temperature of exhaust

    I have an industrial application where 20kW of heat is being wasted, which is painful to watch. I have learned already that low temperature turbines just don't work, so would like to check some ideas and better understand how air motors/turbines work. I have also learned so far that...
  7. G

    Engineering How Does Adjusting Parameter B Affect Servo Motor Friction and System Damping?

    Homework Statement 2. Homework Equations [/B] I'm studying a mathematical behaviour of a servo motor and I need some help to understand it. The output signal is \$\beta (t)\$, representing the angle rotated by the axis at instant t, in relation to the equilibrium position. On the servomotor...
  8. J

    Engineering DC Shunt Motor Starting Current

    Homework Statement Homework Equations Efficiency = o/p divided by i/p I/P KW divided by input voltage gives input current Field Current = voltage divided by field resistance armature current = total current - field current Back Emf = V - IaRa T proportional to Ia Back Emf proportional to...
  9. L

    Engineering Synchronous motor coupled to a DC Compound Motor Problem

    Hi All. I'm having trouble working out the solution to this problem. A Synchronous motor is coupled to a DC Compound Motor. The DC Machine is rated for 220 V DC. Its Armature Resistance is 1.0 Ω . The Synchronous Machine is a 4 pole 400 V 50 Hz 3 Phase AC Machine with an efficiency of 80%...
  10. Cocoleia

    3-phase delta supply to a 3-phase synchronous motor?

    Homework Statement Can we use a 3 phase delta supply to a 3 phase synchronous motor who's stator windings are connected in star (wye)? The Attempt at a Solution I was thinking no, since I read in my notes that the rotor has to be supplied with a "continuous current" But I'm not sure. I have...
  11. S

    Engineering Electrical Machine - Shunt DC Motor Problem

    Hi guys, can someone please have a look at the following problem that I am struggling with; An 8.25 kW shunt DC motor is supplied with a terminal DC voltage of 300 V. The armature resistance of the motor Ra is 0.25 ohms, and the field resistance Rf is 40 ohms. The field winding consists of 1500...
  12. M

    Motor specifications to drive Motorcyle Carousel

    Hi, I'm and uneducated garage tinkerer currently motorizing a motorcycle dolly in order to rotate a motorcycle 180 degrees within its length to enable me to ride off and upon returning to my garage, to rotate the bike in order to drive out on my next ride. My question is what amount of ft-lb or...
  13. me_dexter

    What core materials are suitable for high-speed stepper motors?

    I want to make a stepper Motor. How to find the suitable core material. Can I use Annealed iron as core for stepper Motor? Will Eddy current loss will be more in it ? Is there any way to calculate diff core losses of diff material https://en.m.wikipedia.org/wiki/Magnetic_core Saw the following...
  14. hello_one

    How can i select a steer-by-wire ECU and motor

    I plan to design a steer by wire system,is there a formula to caculate the motor torque?and how can i select a proper ECU. regards.
  15. D

    What generator/DC motor do I need for my wind turbine

    I am making a small wind turbine for my A-level RMT and wondering what kind of generator I need to charge a 12volt battery. The turbine is a vertical axis savonius turbine that will probably be about a meter high and half a meter wide. I know I can use permanent magnet dc motors and someone...
  16. Hans Heyde

    Calculate hydraulic motor for a Flywheel

    Gentlemen: I got stuck in this problem and I really need your help: I have an hydraulic line of 23Mpa ( 3.300 psi) 10 gallon/min I built a flywheel weight 58,000 grams with the following Inertial properties Principal moments I1= 2.5 , and I2= 2.3 and I3= 632170437 grams mm3 Flywheel will...
  17. D

    Can low Resistance affect the torque output of an electrical motor

    I've had a side project in mind for a while involving motorized Rollerblade wheels, however I need to figure out a motor size that would give me the needed torque to actually accelerate 250lbs up to 25mph. I realize even a 5hp electric motor is large but I was wondering if ohms have any affect...
  18. D

    BLDC motor as generator to power eddy current brakes

    Hi everyone - here's a concept that I'd like a few opinions on: As part of a project, I'm looking at using a brushless DC motor mounted on a high-speed vehicle as a generator. Once the vehicle hits its top speed, the batteries should disconnect from the motor and the vehicle's own velocity will...
  19. N

    Motor lowers a mass over a pulley, find acceleration of mass

    Homework Statement When the motor in the figure below lowers the m = 1200kg mass, it produces a tension of 1.15E+4N in the cable on the right side of the pulley. The pulley has a moment of inertia of 71.3kgm^2 and a radius of 0.794m. The cable rides over the pulley without slipping. Determine...
  20. L

    Calculating Torque for Spinning a 250g Plastic Disk on an Electric Motor in 4.6s

    Homework Statement A 250 g , 25-cm-diameter plastic disk is spun on an axle through its center by an electric motor. What torque must the motor supply to take the disk from 0 to 1500 rpm in 4.6 s ?Homework Equations ET=iα The Attempt at a Solution I just really don't know where to start
  21. Cocoleia

    Conservation of Power in the armature circuit of a DC motor

    Homework Statement I am asked in a lab report to explain the conservation of power in the armature circuit of the DC motor. Homework Equations This is the data I have acquired: The Attempt at a Solution I have been reading around, and I have learned somewhat about the Armature Copper Loss...
  22. S

    Automotive Motor Selection for Roller: Diameter 300mm, Length 1350mm, Inertia 3.95 KG.M

    i need to select the motor for a roller of Diameter 300mm , length 1350mm having inertia 3.95 KG.M ,Which needs to accelerate from 0 to 600MPM at 20 sec . Assuming existing web tension acting on the roller 20 N/M. THANK YOU
  23. T

    How does an electric motor convert electrical energy to mechanical energy?

    how does electric motor convert electrical energy to mechanical energy. Hello I do not understand the following electric power is P = V * I electric motors operate on the principle of repulsion and attraction of magnetism. What confuses me where that power ends because as far as I know, the...
  24. H

    Four carbon brushes for a DC Motor- what are they for?

    Hi in every theoretical explanation of any kind of DC motor there's always a split ring commutator and two brushes like in the following pic then when it comes to my motorbike/car starter motor rebuild the real thing in practice is different- see the following pic with four carbon brushes- two...
  25. A

    Lock Gears Without Motor Power: Tips & Tricks

    SO, here is the case guys. I have a mechanism to turn plate by a motor. Both motor and plate was connected through 2 spur gears. But here is the problem, when wind strike the plate, the plate start to rotate even without the power of the motor. What is the best way so i can prevent the plate...
  26. T

    How to know that your Arduino can handle a servo motor?

    I am very new to electronics. How to know if my Arduino can handle a motor? I have a "Carson-model Sport 500502015 CS3 Reflex racing servo" - is it ok and how to know? Afrotechmods said that plugging a bigger motor (anything that draws more than a few mA) would be bad for an Arduino. How can I...
  27. F

    Static Electricity and dc motor

    If take a simple dc motor and connect the negative side to let's say a insulated metal plate. The other side directly to ground and you then turn the shaft of the motor. Would you force all of the free (loosely using all) electrons in the insulated metal plate through the motor to ground giving...
  28. unseeingdog

    How to make a rotating rod turn the axle of a small motor?

    I'm building a small wind turbine and I'm trying to find a way to make the metal rod where the propellers are rotate the axle of a small motor. The diameter of the rod is 1/4" and the diameter of the axle of the motor is about 2 to 3 millimeters. This is more or less the design of the turbine...
  29. F

    Induction motor - calculating rotor flux angle

    Hello. I'm trying to write my own soft for Field Oriented Control of induction motor. I have finished hardware - 3ph 3kW inverter, controlled by STM32F4, and V/F open loop algorithm to control ACIM - it works. Now I'm trying to implement FOC algorithm. As we know we need to do Clark&Park...
  30. C

    Controlling the speed of an AC motor?

    For my IB Physics Extended Essay, I have just changed my topic from momentum to this and I have really little time of doing it... (Due in Oct) :cry::cry::cry::cry::cry::cry: My research question would be The effect of angular velocity of circular motion of a moving sound source on the sound...
  31. S

    4WD Arduino Controlled car - Problem with motor shield

    I've been working with what will be a small Arduino 4WD controlled car, however now I've found a problem. The motor shield I used is an Arduino UNO motor shield R3, v3, which means that it can only control 2 motors, howerver I'll be using 4. Is there any way to use this same shild but apply all...
  32. rkatcosmos

    What is the rotational velocity of hard disk actuator arm?

    0 down vote favorite There is a lot of material discussing the rotational speed of the magnetic disk in HDD but not about the rotational speed of actuator arm. What are the typical actuation speeds of the actuator in HDD? This information will be used in the design of a fast shutter system...
  33. I

    Bead Sliding on Rotating Rod after Motor is Turned Off

    Homework Statement A bead of mass m slides in a frictionless hollow open-ended tube of length L which is held at an angle of β to the vertical and rotated by a motor at an angular velocity ω. The apparatus is in a vertical gravitational field. a) Find the bead's equations of motion b) Find...
  34. S

    Engineering DC motor differential equation

    This question involves finding the transfer function for the system, but I first need to get the differential equations correct. Have I set up the gearbox correctly?
  35. P

    How to calculate the maximum RPM of a motor?

    Hello all, Just wondering if there is a mathematical formula that calculates the maximum rpm. If I have a fan that puts out 3 pounds of rotational force at stall speed(completely still) at the end point of a 1.5 ft blade what would be the maximum rpm of this fan with the blade attached. What...
  36. adamaero

    Red (power: pin 2) wire for servo motor not connected

    Why is the red (power: pin 2) wire for the servo motor not connected to anything in this circuit? https://github.com/samyk/combobreaker/blob/master/Eagle Files/ComboBreaker_top.pngAlso, on the "bottom" schematic, the ground is connected to the feedback (potentiometer wiper) line...
  37. T

    How exactly does an armature spin in an electric motor?

    In an electric motor, there exists two magnetic fields where usually one of them is a permanent magnet whilst the other is an electromagnet. However, how does the magnetic fields enable the armature to rotate / spin? Also, how is the torque from the rotation of the armature transmitted to drive...
  38. Y

    Calculate torque of an 80kg object rotating on its central axis

    Hello, I have a setup whereby: 1) A circular plate with fillet under-edge, is sitting like a bowl on some ball bearings. Imagine if you will a bowl sitting in a way that it can rotate and move a bit up and down etc. without much friction. 2) The plate needs to rotate at about 4 or 5 rpm. 3) The...
  39. B

    Engineering How Is Current Linkage Constant in a Salient Pole Motor's Amperian Loop?

    Homework Statement I have a doubt about the current linkage, Θf, in figure 2.2b of a salient pole motor. In this textbook, the current linkage is expressed by ∫H⋅dl = Θf = ∑i. However, in the figure 2.2b between q(left) and q(right), how can the Θf be constant? Since, the author doesn't show...
  40. T

    Questions about friction losses in an electric motor

    1) What is friction loss / are friction losses? 2) How can it be determined / measured / calculated / figured out? 3) How does it affect the power output (force * speed) of an electric motor when an electric motor is moving / lifting objects? Why does it have such affects?
  41. T

    What determines the maximum weight an electric motor can lift?

    What determines the maximum amount of weight an electric motor can lift / move for its size? So assuming the electric motor weighs a specific amount, what would be the limiting factor to how much weight it can move / lift for the weight it weighs?
  42. K

    Understanding Universal Motors in Power Tools: 2 Pole vs. 4 Pole Explanation

    Hi i recently completed my mechanical engineering and was interested in studying how power tools work! when i did some survey i came to know that they work on the basis of universal motor usually. So now the question rises whether it is a 2 pole or a 4 pole? what will happen if its is 2 pole and...
  43. B

    How does using a 12v starter motor on 24v affect power and current draw?

    hello, if i use a 12v 1.2kw starter motor on 24v. how the power will change and how much current will it consume.
  44. T

    Why is my new 1ph AC motor overheating?

    Hello all, I'm about at my wits end with this project, so maybe someone with a little more knowledge can help me out? I recently bought a 30" Patterson air cannon fan that came with a Dayton 1hp 3ph ac motor. The whole unit needed to be reconditioned, and the motor needed to be replaced. After...
  45. 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?
  46. 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...
  47. 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?
  48. 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...
  49. 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...
  50. 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...
Back
Top