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. V

    Automotive Calculating acceleration from electric motor

    I am in the process of designing an electric motorcycle, and would like to approximate the acceleration from various motors to inform my decision. I have written simple software to produce performance graphs, but my results seem a bit off - so i'd like to check my calculations. Here is the...
  2. Z

    Engineering DC Motor and armature current

    Homework Statement Hello I have a bit of a problem solving this A 20 kW, 500 V d.c. shunt wound motor draws a current of 45 A when running at full load with a speed of 600 rev min–1. On no load, the current drawn from the supply is 5 A. If the armature resistance is 0.3 Ω and the shunt field...
  3. D

    Which supercapacitor range is needed to run a 48V DC motor?

    I'm doing a project where I need to hand power for dc motor (12V or 24V) and charge a super capacitor, and then use it to drive another 48V dc motor. I want to know which Super capacitor will be suitable? Please give suggestions for Super capacitor specifications for both 12V and 24V that will...
  4. F

    Question about magnet flux and saturation in a motor

    There are 2 primary flux paths in a permanent magnet brushless DC motor. One from the north face of a magnet to the stator through the coils/windings then into the south pole of the adjacent magnet. The other flux path would be from the backside of the magnets through the rotor metal they are...
  5. J

    Engineering Synchronous Motor Phasor Diagram

    It's not really a problem but I was studying Sync Motors for assignment and didn't understand few things. 1. Homework Statement http://s1320.photobucket.com/user/ajaytulsiani/media/-%20ia_zps8oujbzrh.jpg.html http://s1320.photobucket.com/user/ajaytulsiani/media/synch_zps3bry0aah.jpg.html In...
  6. E

    What's about no air-gap in motors?

    Hi, I saw few threads here about air-gap in motors, and I wonder what if we ignore mechanical issues and make an "iron-gap" in the motor. for example: in linear motor(e.g. this cute one: https://www.physicsforums.com/threads/linear-motor-equations.794499/) if we make the tube between the stator...
  7. L

    CSA of cable for Motor with VSD

    I normally use ELEK Cable Pro to calculate my cable sizes and it works very well however I have a project at the moment which has a circuit which I need help calculating the correct size cable for;The circuit is for an 18.5kw 400v motor. I have used the following Load – 18.5kw V- 400v...
  8. A

    Calculating Continuous Torque Curve for Electric Motors?

    Hi there, I have a motor peak torque, peak power, peak speed, rated torque, rated power, rated speed, torque at max speed. I was able to produce the peak torque curve. But, i don't understand how to create this continuous torque curve here. I have attach a link here, and somehow the continuous...
  9. D

    Ohm's law and using motor as generator

    hello i was wondering about how a dc motor would work as a generator and how the voltage and current would scale with ohms law. for example let's say i had a 350 watt motor that's 36 volts and generates 9.72 amps now let's say i use that motor as a generator but only generate 200 watts how would...
  10. Fizzics

    Power measurement of a servo motor using simple instruments

    Hello all, I have a 1kw 3 phase 10 pole servo motor which is powered from 240 volt ac single phase supply via an invertek p2 controller/inverter. The motor is only operated for short high speed bursts and I would really like to be able to measure the power usage of the motor using formula and...
  11. I

    Where in the brain do we sense our internal organs?

    Hello, I know that the sensory cortex in the postcentral gyrus collects sensory information from different parts of the body, but in all the drawings and explanations, I see that it only gathers information from the surface of the body. Which part of the brain gathers information from our...
  12. Sherldonnnn

    Transistor questions in control a stepper motor

    Hello, I am Sherldonnnn. I'm very happy I can ask my questions here to get your help. If you can help me solving my questions that will be very nice. Now I am trying to control a stepper motor with a simple transistor-based switch. I still with to consult with the experts here on some basic...
  13. peter010

    DC Series motor: current vs load....

    Hiz lets assum we have a load fixed on the roter of a the 'DC series motor' in the attached photo, where: Vt: DC source voltage (constant) Lf: field's inductive resistance (will be neglected) Rf: field's resistant Ra: Armature resistance Ia= Armature current, If: field current M: back emf (Ea)...
  14. G

    What's the min power needed for a DC motor to move 5K lbs?

    I am making a some sort of an electric vehicle (cart) that will be used to move things around the two story warehouse. I am trying to figure out what would be the minimal power of an a DC motor, considering that the max speeds will be up to 10 MPH, while being able to push forward to the second...
  15. H

    Solving Motor Braking Circuit Problem in Bowling Industry

    I have been doing a lot of reading online concerning this circuit but having little luck in my dilemma. I work in the bowling industry the machines use 1/3 HP 115 v single phase induction motors. FLA on these motors is 6 Amp. These motors use capacitors 480-520 MF for braking. This braking...
  16. A

    Mirror Plane Motor & 5000+ RPM: What Image?

    If we take a mirror plane mirror circular and make it to setup with a high speed motor and make it to rotate at a speed of 5000 rpm and more ..what would be the image formed on the miroor if an object is made to be placed. Give me better answer...i don't know [emoji17] [emoji17] [emoji17]
  17. O

    How is there not an infinite regress in the EMF of a motor?

    Say we have a coil connected to a battery in a uniform magnetic field, perpendicular to the magnetic moment of the coil. This is a simple motor. There is a torque on the coil that varies with the angle θ between the field and the moment. Clearly, the angular velocity ω is not constant. Here is...
  18. B

    One way clutch for motorized cable reel?

    I am newbie in the area of clutches. I am making a motorized cable reel (DC motor) which I needed to make it easy for anyone to pull the cable reel out manually without much effort. Only pulling the cable out is manual. The retraction of the cord is done automatically via the DC motor. So, based...
  19. Fizzics

    How to Harness braking energy from an electric motor

    I have a controller fed 3 phase 1kw servomotor which moves a mass over 1 metre ramping up for 1 second whilst energised, then it ramps down for 1 second. The motor is on (energised) for 1 second then it is off (braking) for 1 second which completes the first cycle, the cycle is then repeated...
  20. H

    DC Motor for Miniature Car

    Hello all, I'm building a miniature vehicle and plan on using a DC motor that supposedly spins at 12800 rpm (1340 rad/s) for the engine. However, I'm a little confused as to what the car's acceleration would be. The DC motor on its own would instantaneously have an angular velocity of 1340...
  21. marellasunny

    Alternatives to varistors as overload protection at DC motor

    Alternatives to varistors as overload protection at DC motor DC Motor here implies 12V linear actuator w/DC Motor that consumes 2.8A under loading condition. Pretty costly equipment. I'm using a L298N motor driver connected in parallel to run the linear actuator. The motor driver is run by a...
  22. Akmalidin

    Why permanent magnets are not used in Synchronous Motor?

    I am Telecommunication student but interested in motors.Especially, power generators.I was wondering why permanent magnets are not used in synchronous motor's stator or rotor? Is induction motor more efficient than permanent magnet used motor? What about in power plant generators, do they use...
  23. A

    Utilising a DC Treadmill Motor

    Hi, so I salvaged a 220v, 6.5 amp DC permanent magnet motor from an old treadmill and I was having some trouble with it. I believe that AC motors can simply be run from mains power (I have an AC motor from a dryer that I cut the wires from in order to bypass the circuitry and essentially...
  24. StrawberrySaturn

    How can I apply extremely low forces to an object?

    I want to be able to build or find a mechanical device that can apply very low force/pressure to a material. I have considered using a stepping motor with a flat needle tip but I can't think of a way to make this delicate enough to not destroy my sample. I am wanting to apply forces in the range...
  25. kolleamm

    Reducing servo motor jitter noise

    I have a digital servo that makes a lot of jittering noise. The motor itself works great, however when you set it to a certain position while applying a force it will make a jittering sound as it tries to find the optimal position, which is pretty common for digital servos to do. My question is...
  26. srinaath

    Device that changes the direction of single phase ac motor?

    hi alll...we know that by changing the polarity of phase and neutral , direction of ac motor can be changed. but is there any automated device that does this job? ...
  27. S

    Makeshift DC Motor Radiating EMF

    My brother is a high school student tasked with making a DC motor. It is finished and works however I thought for the sake of learning and the additional cool factor (I'm relatively new to this field), I could make an optical RPM sensor which I could tack on. So I made this...
  28. T

    Engineering Induction Motor Problem, How to find Rc

    Homework Statement A three phase 220 V , 60 Hz, six poles 10 hp induction motor has the following circuit. Parameters on a per basis referred to the stator: Rs = 0.334 Ω, R’R = 0.147 Ω, Xs = 0.498 Ω X’R = 0.224 Ω , Xm = 12.6 Ω The rotational losses including the core losses amount to 262 W...
  29. U

    Simple Motor Project Solution Needed.

    Hi, so in class we are suppose to make a motor kinda like the one in this video with copper wire. That part shouldn't be hard but I also need to make it move something (like a coin), I'm not really to sure how to make that happen. Does anyone have any insight on how I can get the rotational...
  30. kolleamm

    Measuring motor current on different leads

    Let's say I have a simple small DC motor. If I measure the current by putting two multimeter leads on the positive will it be a different value then if I were to measure it on the negative? My guess is that the current measured on the negative lead will be lower because the energy used in...
  31. Passionate Eng

    Back EMF & Rotor Flux: Synchronous Motor

    how is the back emf affected by the flux of the rotor? I know the relation : Ea=k*phi*w but i need a physical explanation
  32. N

    Farm Motor Capacitor Replacement

    Hey guys, I need some help with replacing a blown capacitor. I've linked below to the machine we are working with, Penagos k-60. I'm not able to find any documentation on the capacitor. The one we took out of the machine today is so old that we aren't able to see any of the writing and it's...
  33. Fizzics

    What would be the most efficient 1kw motor to use at low RPM

    ...Up to 300 rpm (3 phase motor) and what sort of efficiency could I expect under normal conditions with a small load? Thanks
  34. Fizzics

    Is it Possible to get over 90% efficiency from a servo motor

    ...If so what would the highest figure be whilst running a 1kw (single or 3 phase) motor under normal conditions also would using a 10:1 Gearbox change that efficiency level?
  35. T

    AC Mains Inverter Refresher: exotic advantages?

    Hi, Could I please get some conformation and clarification: So the more phases an inverter has, the less ripple will be on the DC bus, and the higher the switching frequency the inverter is operating at, the closer the approximation is to a sine wave. These are the advantages? But what are the...
  36. aniket suryawanshi

    Automotive Fixing an electric motor and controller

    hey I'm about to modify the current maruti suzuki omni van into electric van we're constructing it for goods carrying purpose. the current one is powered by ic engine developing 35 bhp and 60 n-m torque. modified vehicle should satisfy following criteria. 1. GVW= 2000kg. 2. frontal area= 2.34...
  37. E

    Speed And Direction Control of Motor

    Hello, In case of DC we use H-Bridges To control Dc motor direction and Speed with PWM. But in case of AC motor Single phase and 3 phase motor how to control Speed and direction?
  38. D

    Motor necessary to power a small cart

    Is a 6.5kg/cm torque motor enough to move (let.s say at 6km/h) a small go cart and a kid (total w. about 45kg)? this is the motor: http://www.amazon.com/dp/B00T48KC1Q/?tag=pfamazon01-20 PS: this is not for a homework but for a for-fun project.
  39. cnh1995

    Understanding Synchronous Rotation in 3-Phase Induction Motors

    Suppose a 3-phase IM is operating on a 50Hz power supply. When the motor is loaded, more current is drawn from the stator because of the demagnetizing effect of the rotor current. But the rotor current has a lower frequency i.e. slip*stator frequency. Still the reflected current in the stator is...
  40. R

    Automotive Help on throttle mapping for gas/electric hybrid motor

    hey all - ive built an big amp DC electric kart, and want to add a gas motor for secondary drive. not going serial hybrid - I want both to be drive motors. I've written controller code (can link to it if anyone wants) - but the problem is not the code - its how to map the transition of...
  41. Ali Durrani

    Permanent magnet motor drive train

    Hello there, can anyone tell me what is a permanent magnet motor drive train and what is the working principle of permanent magnet motor drive train ? i have searched google but i couldn't find anything useful
  42. A

    Is it possible for "me" to make a hoverbike?

    Hi, I saw a video of a guy who made a hover and figured; hey, I should try making one too. I've a general design in my mind. His design had two propellers, one on the front and one on the rear. I wanted to make a bike with more than 2 propellers( assuming more the propellers, greater the...
  43. cyril joel

    Connecting 12V DC Motor to Two 9V Batteries

    Hello i am abeginer i have to connect a 12v dc motor can i connect it to two 9v batteries in series meabs a total output of 18V.
  44. srinaath

    What is the minimum number of poles in single phase motor

    three phase induction motor can have minimum two poles, so synchronous speed of the machine can be 3000rpm. While single phase motors have two windings - auxiliary and main winding, so minimum number of poles in single phase winding is 4??!...am i right?
  45. Narayanan KR

    A motor design to defy Lenz' law?

    1. The two rotors (purple, green) are electricaly isolated but mechanically fit to rotate along same axis 2. The motor action on the left side rotor will move the armature set, this will produce currents in right side rotor that will pass via a variable load. 3. do you see the magnetic fields...
  46. DjMadness

    Power Factor Correction for a small 60W AC Induction motor

    Hello, I have a light AC fan, that I wish to correct its power factor. According to my measurements, it has around 0.7 LAG power factor. Here are my digital measurements: Vsupply = 204VAC I(load) = 0.237Amps phi = 43 , pf = 0.7 LAG My target power factor (pf) is to be 0.85 , and to...
  47. T

    Induction motor locked rotor test

    For the locked rotor test I have these values, P1 = 620W Stator line voltage = 32V Stator line current = 8.4A To calculate active power/phase, Po = (P1+P2)/3 But I don't have P2, Is P1 maybe equal to P2 ?
  48. r_prieto5

    Start-up acceleration, max speed and torque of a transfer car

    Homework Statement A transfer car moves concrete slabs. Given values are wheel diameter D, shaft diameter d, rolling resistance FL , speed v, car weight mv , load weight mk , output power P at rotation speed n, average torque Mm , motor moment of inertia Jm , fan moment of inertia Jt and...
  49. H

    Hydraulic Motor & Constant Torque

    Hi, I'm a beginner on hydraulics and have been reading up a lot of literature. But I'm not sure if my assumptions are accurate and I hope I can discuss with other forumers here! My apologies in advance if my questions seem silly! Background: My goal is to drive a hydraulic motor at constant...
  50. J

    Low RPM, high power calculations help

    Hi guys, Im trying to build an electric wheelchair with mecanum wheels, and as you might know, each of its 4 wheels has to be independently powered for the chair to have holonomic motion. With my desired speed to be around (brisk) walking speed only, say 1.15 m/s, and my mecanum wheels sized...
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