Motors Definition and 336 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. T

    Rear wheel drive with separate motors

    I have built a rear wheel electric with two motors one for each rear wheel. The motors have separate controllers and both are controlled by a single throttle. This throttle sets a torque for the motors . In a straight line the torque is the same for each but when cornering the torque setting is...
  2. T

    How can I safely salvage and understand basic motors at home?

    This is my first post, so please excuse any mistakes I might make. Sorry in advance. First and foremost, if anyone thinks I am being unsafe in any way, please let me know. I like to do things hands-on. I learn best that way, but I want to be safe. I am a budding electrical engineering student...
  3. B

    How Can I Determine the Number of Poles in a Burnt AC Induction Motor?

    Hello, I want to know determining the number of poles by inspecting coils inside the motor. Generally, there are formulas allowing us to plug a frequency, an rpm, and give off the number of poles, or we can just simply look at its nameplate. My reason for needing the inspecting is that my...
  4. C

    Cool question/scenario involving friction, motors, gearbox,

    Question: What parameters are needed to have no slippage between 2 small drive wheels and the bowl? Startup of the system is obviously the moment where there is the greatest chance of slippage. As in the illustration above this is a possible layout of a device for rotating a large bowl...
  5. S

    The most suitable batteries for 4x5V motors 1.2A

    Hello, I'm looking for rechargeable batteries for 4x 5V motors of nominal current draw 1.2A and peak current up to 3A to power my robot. I'm wondering about...
  6. J

    Will a Faraday cage affect the efficiency of motors inside?

    "A Faraday cage or Faraday shield is an enclosure formed by conductive material or by a mesh of such material. Such an enclosure blocks external static and non-static electric fields by channeling electricity along and around, but not through, the mesh, providing constant voltage on all sides of...
  7. cnh1995

    Motoring Effect in DC Motors: Magnetic Field Interaction or Lorentz Force?

    When current flows through the armature winding of a dc motor, what exactly happens in there that produces the torque? Is there a force due to the interaction between two magnetic fields or Lorentz force acts on the conductor electrons? Basically, why does motoring effect take place? Is it due...
  8. Barhemo

    2 motors on robot -- how can I save the movement history?

    hello, I have a car robot with 2 motors which follows a black line. I want to save the track which the car follows. I can get the speed of each motor every. I thought about saving the 2 motor speeds every 100msec and then figure from this the track. Any ideas how I can do it?
  9. T

    Engineering Solve DC Motor Problem: 250W 24V 1800rpm

    Homework Statement A 250W 24V 1800rpm DC machine is operated as a shunt connected motor and connected to a fan that draws 60% full load current through the armature. 1) Sketch the circuit 2) The field winding requires a current of 0.8A to produce a motor EMF of 24V. Determine the field...
  10. arnab ghosh

    Why are synchronous motors grounded with reactance

    Why are synchronous motors reactance grounded and not resistance grounded like in alternators?
  11. ranju

    How are poles created in induction motors?

    I wanted to know thta how the poles are generated specifically for induction motors..?? I am not getting the main concept behind it that how the poles are being created with flowing current and with reversal of current the poles become alternatively north & south?
  12. M

    What Should You Know About Using DC Motors in Wind Energy Projects?

    Hi, I'm doing research for my science project. I chose Wind energy and I need to learn a few things about DC Motors, Who is a good manufacturer for 6-9V .5 amps DC motor/generators? What happens if the generator goes over the recommended RPMs? How do you keep the RPMs between the minimum...
  13. ranju

    Finding Full Load Current & Torque in Induction Motors

    In an induction motor problem , I need to find the full load current & torque..for that I calculated the impedance with given data..& I got the impedance in polar form..But in the solution for finding the full load current they put only the magnitude of the impedance & not the phase..! I didn't...
  14. dlgoff

    Shaded Pole Motors: Old Electrical & Measuring Things

    I'm wanting to add some small motors to my Beauty of old electrical and measuring things etc. thread and was curious if anyone here is familiar with Shaded Pole Motors?
  15. PhiowPhi

    Linear reaction force on motors?

    I have two motors(m1 &m2) placed on a vertical position(on the ##y-axis##), that have gears connected to their shafts, and I placed the gears next to one another. Fixing them to move together. I now powered both motors allowing their torques to oppose one another and cancel out each other's...
  16. S

    Running 3 motors in circuit, where to insert lipo alarm?

    Hi all! I'm working off of this schematic for a modded Nerf blaster (note: schematic not my own work). I am hoping to hook up a little lipo alarm (http://rcbitz.com.au/images/MiniLipoAlarm.jpg ) somewhere in there to display the voltage of my 1s lipo I'm using to power it. Question: Where...
  17. ranju

    Role of Armature Current in DC Motors

    In case of dc motors , w eknow that ..we have a supply which supplies a current which divides into armature & field current for shunt motor...& the field current generates flux which links the armature winding & emf is induced.. but here I want to know the role of armature current .! Armature...
  18. julianwitkowski

    Question About Torque and Stepping Motors

    I'm looking for a high torque stepping motor for a project. Acceleration torques from 3.6 N-m to 360 N-m High output torque at low speed – continuous 10 Lb-In (1.2 N-m) to 1062 Lb-In (120 N-m) How do I calculate much mass this can move ? 1.2 N-m = 1.2 J = Force ⋅ Distance = 1.2 kg⋅m2/s2...
  19. mootz

    Horsepower needed to lift 600 lb load, w/8 motors

    Good day Geniuses. im building a drone prototype for an agricultural project. approx. weight will be 600 lbs, using my own 8 rotor design. trying to determine rotor size and motor power required to fly such a device at 30 feet. would also be interested to determine an approximate wind speed...
  20. N

    Which Motor Driver IC is Best for Interfacing 4 DC Motors in an RC Car?

    which motor driver ic is to be used to interface 4 dc motors in a RC car? And how is the interfacing done?
  21. P

    Overall Power Factor of three motors for transformer voltage drop calculation

    Hi Suppose I have three motors connected to a single busbar which is fed by a single transformer and suppose that the current into the busbar (i.e. the total current of the transformer secondary) is known. If I wish to calculate the transformer voltage drop the I will obviously need the load...
  22. D

    Why do DC motors not work on AC?

    Yes I now a DC motor is for DC (lol) but I don't understand why do they change rotation 50-60 times per second (vibrate) when connected to AC, I though that, like AC or Universal motors, the alternating current would "replace" the commutator? Thank you :)
  23. rajeshputta

    Star, delta, and star&delta motors

    sir, 1)star connection 3ph motor(415V) which load location is suitable? 2)delta connection 3ph motor(415V) which load location is suitable? 3)star&delta connection 3ph motor(415V) which load location is suitable? please support me.
  24. C

    Rotation of two motors and two disk with friction

    Homework Statement I changed the problem, because I understood my error I forgot a force. It's the same problem with one motor. A motor drives two disks on a support. The support is turning clockwise at w1. Disks turn at w at start. The motor M gives a force F and a counterclockwise torque...
  25. K

    Basic understanding of the motors torque and programming wit

    Hi guys I hope you have time to take a look at my calculation and tell me if this is possible to achieve. I have to make a project, where I have to rotate an object which will resist more and more to the rotation. The protocol is: Rotate the object with a torque of 5 Nm until the resistance...
  26. I

    Very Accurate Motors: Piezoelectric & Ceramic Motors

    I am searching in google after professors websites or articles \ papers or video lectures in very accurate motors (1 nanometer), that use the principles of piezoelectric and ceramic motor movement, that can move in linear and rotate movement and they are rapid, and very small, if you know about...
  27. W

    Squirrel cage induction motors - rotor issues

    Hello all, I am currently involved in a diagnostic project for an induction motor with suspected rotor stator contact. all critical dimensions have been checked but the question has been raised by none electrical observers: Does the location of the rotor bars effect the magnetic center line...
  28. J

    Brushless gimbal motors vs servo?

    anybody know anything about stabilization systems? I posted the question "Servo vs. Stepper motor for stabilization" before, and I eventually learned that stepper motor draw power while holding position, which servos do not, so I was fixated on servos for a while. Then I started realizing how...
  29. sharm8

    Engineering Build Simple Electric Motor | 1500+ RPM | Copper Wires, 1.5V Battery

    Homework Statement Hello ! I'm making a simple electric motor. Using copper wires and 1.5V battery. 2 magnets, 2 thumbtacks, 1 block of wood, 2 paper clips, and approximately 2m of insulated copper wire. -The diameter of the loop must be 1" CAN'T use other materials, only the above listed...
  30. B

    DC motors -- speed control question

    hi there, I have 3 dc motors (12v-5 ampere)that are connected each with a speed reducer gearbox, actually I want to control these motors with a JOY-STICK switch just controlling there movements in fixed speed, should I use a pwm circuit to drive them or a simple 3-axes joy-stick is enough? if...
  31. J

    Inverter, Atex motors, star, delta

    Dear Friends, I need technical solution for my problem; Specification: I have two motors, type: 1. HCT/ATEX 45-2T-2 (R/MIN=2800), (400V-3,60A), (KW-1,50) 2. HCT/ATEX 45-2T-3 (R/MIN=2860), (400V-5,00A), (KW-2,20) Also, every motor has its own inverter: Inverters are from INVERTEK DRIVES...
  32. Madhusha

    Difference Between 120 & 180 Degree Pole Arc Brushless DC Motor

    Guys Can you give me what is the difference between construction in 120 degrees pole arc and 180 degrees pole arc brushless DC motor with trapezoidal bldcm?
  33. D

    Understanding linear stepper motors

    Hi guys, 1. In this video: Could someone explain me how the linear stepper motor responsible for drawing/injecting the syringe works? I mean, the threaded rod going through the motor is suppose to turn around its axis in order to advance linearly and in this mechanism there's a rail to the...
  34. Entanglement

    Velocity uniformity of rotation in dynamos and DC motors.

    How can velocity uniformity in dynamos and motors be explained? What's the mechanism of that happening ? I'm aware that Newton's first law is involved in that situation where an equal and opposite torque must act on the coil during its rotation so the net torque is Zero and the coil keeps...
  35. Artlav

    Axial flux alternators and motors design?

    Axial flux alternator is an easy to make pancake of stationary coils between spinning permanent magnets. Having made one and played with it, i ended up with a few questions. Would it make a good motor? There are axial flux motors for sale, and my alternator spins nicely when hooked up to a...
  36. N

    Worm gear system with 2 input motors?

    Hi guys, I have 2 mini motors and a set of worm gear. I would like to know how to build a system that can make use of the torque from both motors at the same time so that I can double the torque without losing speed. thank you
  37. A

    What part defines the basic type of dc motors?

    a. the commutator b. the brushes c. the field d. the armature I know this is a basic question, its off an old exam paper I am looking at. I think its the brushes because if it doesn't have brushes, then its a brushless dc motor, which isn't basic right? Thanks for your help! :shy:
  38. D

    Multiple motors to drive a single axle

    I want to turn an axle or a wheel using multiple motors. With a single motor, sometimes the power is not enough. Is there any method to use two or more motors independently driving the same axle or wheel ? The idea is to have contributions from all the motors so that the axle or the wheel gets...
  39. D

    Do all electric motors follow these two laws?

    Do all electric motor's follow Faraday's law and Lorentz? Is it safe to say generalize that statement?
  40. A

    Approximating a Slider-Crank Acceleration Profile w/ Vibration Motors

    Say I have a mechanical device like this one: If I plot the acceleration profile at (trace-) point D I get something that looks something like this: Now, here's the question: Can I build a device composed of one of more (eccentric rotating mass) vibration motors that when rotating...
  41. B

    How can my motors sharpen my knives?

    Hello I'm currently studying an engineering course at college and for this I'm required to complete a project. Knife sharpener. Two spinning cutting tools driven by individual motors. I'm wanting to power two small low voltage dc motors from a 230v ac supply. There will be one main...
  42. N

    Understanding Rotor RMF in Squirrel Cage & Slip Ring Induction Motors

    is the rotor rotating magnetic field(R-RMF) present in squirrel cage induction motor (SCIM). Is it same as in 3 phase ROTOR winding of slip ring induction motor (SRIM), generating rotor RMF. * THE 3 phase, supply given to stator 3 phase winding of SRIM, generates (RMF), which cuts the rotor 3...
  43. C

    Tubular permanent magnet linear motors

    Hello all, I'm a mechanical engineer who recently recently became interested in linear motors and generators (random, i know). I've narrowed my interest to tubular linear permanent magnet motors (servo types) such as the ones made by these people...
  44. B

    Can Electric Motors Revolutionize Aircraft Propulsion?

    Greetings, everyone! A couple of my friends and i started work on a project regarding VTOL aircraft design. We are interested in the concept of propelling the air vehicle via propellers rotated by electric motors. As all of us, have relatively limited knowledge on electrical...
  45. H

    Why do stepper motors waste the most energy when not being used?

    Hi: My friend told me that stepper motors use the most power when not being used, is it true? if so, why? thank you
  46. B

    Controlling Motors with Infrared Light

    Hi everyone, I'm looking to create a circuit where an infrared detector is located above the edge of a small wooden disk with an infrared light also on its edge. I want to wire this up so that while the detector does not see the light, power is supplied to a motor that will turn the small...
  47. S

    Electric Motors: Beginner's Guide for Engineering

    hello I am really new to engineering. i know the rock bottom basics of these stuff but really rock bottom. i have a couple of questions regarding electric motors: 1)torque- what makes a motor have more torque? 2)rpm- what does that effect? and if I am not mistaken higher...
  48. O

    Engineering Intro to 3-Phase AC Motors: Understanding Wattmeter Measurements | Help Needed

    Homework Statement hello everyone I'm a little confused with the whole 3- phase system. for example: I tried solving using differenet methods we were taught, but every way i try i get a different result. For example: 1) I thought that the wattmeter will measure the Real Power of a...
  49. V

    Why Do DC Brushless Motors Need Hall/EMF Sensors?

    I understand the basic gist of the whole DC brushless motor, but I don't understand why there needs to be a sensor. Why can't the controller just alternate between phases at a constant rate? What I mean is that if there are a fixed number of ways the coils can be charged, why not just alternate...
  50. E

    Measuring magnetic fields Will motors and metal frame interfere?

    Hello all, thanks for reading. I'm in the process of designing a machine that will move a hall effect sensor in 3 dimensions through a magnetic field and record readings. Before I started the design however, I wanted to see if there would be huge problems in how I envision this machine...
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