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. F

    Why Choose Higher Pole Motors If Lower Pole Motors Can Achieve Similar HP?

    Often I'm reading on other sites that if a 2 pole 3600RPm (synchronous speed) motor were connected so that the ratio would lower the speed to the same as a 4 pole (2X) and so on with 6 pole (3x) the output HP will remain the same. However the larger the number of poles the larger the motor and...
  2. M

    Machine Design - How To Determine Motor HP Etc.

    I am planning a build on a simple 4-wheel-drive cart for hauling equipment for my business up/down yards with grade. 4 wheel cart will have weight capacity 1500 lb with potential of crossing up to 35 degree slope (slow RPM/high torque/motor brake necesary.) This will implement a 110V AC...
  3. D

    Frequency versus motor RPM and number of poles

    Which equation is correct I have seen both- F=N/60*P Or F=N/120*P This is Frequency, N=RPM P=Poles
  4. W

    What is the initial force required to start an electric motor and generator?

    Hello all, So I am confused about a a scenario and I hope you guys can hook me up with some explanation. So I am trying to find the initial force needed for an electric motor to turn. I am not looking for torque or energy just the Newtons just to start from scratch and keep going with the...
  5. S

    Induction motor project advice

    I'm planning on building a simple induction motor for my class project and am hoping someone might have some advice about powering the motor. I feel a little ridiculous asking but I had almost no understanding of electricity prior to the beginning of my Physics 212 class and the textbook doesn't...
  6. M

    Engineering Speed control of induction motor in steady state

    In this experiment, we'd learn about vector control of an induction motor. By using the constant rotor flux linkage vector control method, An AC induction motor can achieve a DC motor-like performance. Firstly, we tested on speed control response in steady state. *the proportional gain kp =...
  7. Z

    Running DC motor at higher than rated speeds

    Hi, I had this power electronics lab experiment where we control the speed of a separately excited dc motor using thyristors. The dc motor is rated at 1500 RPM but we do get readings where the speed is above 2500 RPM. How is that possible? Thanks
  8. K

    Can a Motor-Powered Generator Increase Electrical Output?

    Hello everyone, I would like to know if it is possible to produce more electrical power from a generator if it is powered by an electric motor through a speed multiplier gearbox? Any answer will be greatly appreciated.
  9. B

    Use a motor to turn a threaded rod

    Hi everyone, Is this something that I can use to link a motor to a threaded rod (so when the motor turns, the threaded rod turns as well)? also, about how much torque will i be needing to slowly rotate a 1 foot steel threaded rod? Thanks
  10. T

    Creating a remote starter for servo motor

    I need some help with this guys. I'm by no means an electrical engineer, although I am an IT Administrator, I'm looking for some advice or a direction of where to start. I've got a servo motor that I would like to set up to start remotely. Where do I need to start, and how do I go about...
  11. J

    Can a Loss of 30 Volts Cause an Electric Motor to Overheat?

    Hello, looking for some information on electric motor theory for a problem I encountered on a friends machine. An on site generator is our power supply, our motor requires 480v/ac 3phase, our generator is providing 500v/ac but we are losing 30 volts under load from our extension leads. our motor...
  12. M

    Controlling a Stepper motor with L298N board

    Hi guys, So i just bought a L298N motor driver board and I'm planing to connect it to a stepper motor. I'm wondering what kind of stepper motor should i use? The one that has 4 wires or 6 wires? Btw, what's the difference with bipolar and unipolar stepper motor? I'm planing to control it...
  13. K

    [Induction Motor] help to understand this concept

    Hi all I am trying to understand the concept of 3 phase wound rotor induction motor. I understand why when you feed in 3 phase current to the stators that are separate spatially 120 degree will get you a rotating magnetic field. However, I am having much trouble in understanding the...
  14. 1

    Can a Self-Supply Gravity Motor Generate Infinite Energy?

    Is it possible to create enough energy( by letting a pound falling to crank a rotor) to bring back up the pound?
  15. M

    Engineering Inverter - V/F constant control of an induction motor

    Hi. I am writing a report on an experiment. The experiment is on power electronics. An investigation of V /f constant control of induction motor with inverter was carried out. A converter and an inverter are connected to an induction motor to change AC to DC and back to AC, as shown in the...
  16. M

    Engineering V / F constant control of induction motor with inverter

    Hello. I have to do an experiment on this topic, but there are many things I don't know. First of all, can you tell me what do the symbols V~ and A~ mean?
  17. L

    Troubleshooting Strange Noise from 250kw 3 Phase Motor

    Hi guys I have been testing a brand new 250kw 3 motor wired in delta. I have it connected to a 170 amp vfd with no load for testing. It draws 105 amps at 50hz and is balanced. Intermittently the motor makes a strange that i have not heard before. It sounds like a spoon taping another...
  18. C

    Power Output & Work Done by a Motor

    Homework Statement A small motor is used to operate a lift that raises a load of bricks weighing 500N to a height of 10m in 40s at constant speed. The lift weighs 300N. What is the work done by the force of the motor? What is the work done by the force of gravity? Homework Equations P...
  19. T

    How can I calculate the efficiency of a DC motor for different torque values?

    Hi, I'm attempting to make a model of a DC motor capable of calculating the efficiency of the motor for different values for torque. I have managed to make a code to generate the torque-speed-power plots for given inputs, however I have been unable to figure out how to calculate the...
  20. Y

    Engineering How to control stepper motor speed in emu8086?

    how can we control stepper motor in emu8086? we have to take input AT RUNTIME that if we enter 0 it will stop the stepper motor, 1 for slow speed, 2 for medium and 3 for fast speed.
  21. Z

    Engineering Test rig calculations - motor requirements

    Homework Statement I'm designing a tyre test rig for a university project to measure camber, slip angle etc. An example of a test rig - http://www.ika.rwth-aachen.de/forschung/veroeffentlichung/1999/30.06.-02.07/im173g.gif Although my test rig will be for an RC car tyres, so not quite the...
  22. J

    Homemade elevator from electric motor

    I want to make an elevator lift from an electric motor. The motor has a 42 mm shaft that turns at 1800 rpm. I want to lift approximately 200 pounds total twenty feet high, slowly and safely. I was hoping someone with knowledge of pulleys and gears could help me figure out what I need to...
  23. J

    Motor Selection to Operate Golf Cart Steering Wheel

    Hi all, I am trying to select a motor for a project that will have enough torque to operate the steering wheel of a golf cart. I'm trying to avoid over design as I want to be as economical as possible. The problem that I am having lies in determining the torque that is required to move the...
  24. J

    Calculating the horsepower for a motor

    Homework Statement This is not really a homework question, it is a question for a project I am working on. So I have a heavy rod that is 1.4 m long and I want to get a motor to rotate it (I would like to see if this is even plausible). I calculated the moment of inertia for this rod to be 75.2...
  25. I

    Control torque of 3 phase motor

    Dear all, This is a newbie asking for some information. Actually, we have 1x30HP, 2x10HP motors working at our workplace. When we start the motors there is a lot of torque generated due to which our grid supply charges us penalty every month. We need information about the device(s) that...
  26. K

    Choose Best Pole-Slot to Increase Motor Speed

    hye everyone...I wish to ask help from all of you make suggestions to me to choose number of pole-slot that suitable to increase the speed of motor.thank.
  27. perplexabot

    Understanding DC Motor Modeling: Exploring the Role of Inductors and Back EMF

    Hello. Just started learning about how to model a DC motor. A simple model consists of the input Voltage in series with an inductor, a resistor and a back emf. I have two questions. Why have both the inductor and the back emf (voltage source)? If you know that at a voltage V and a load L1...
  28. E

    Pulling mass with motor through pulley (with mass)

    Homework Statement http://puu.sh/4PDPV.png Homework Equations τ = I*α τ = r*F The Attempt at a Solution EDIT2: Nevermind, manipulated the torque equations wrong, got it now EDIT: Tried again and ended up with an actual answer, but still got it wrong :/ This is the FBD I used...
  29. M

    How Does Switch Frequency Affect DC Motor Performance?

    I've been looking around for formulas on how to calculate different aspects of DC motors and buck converters such as average current. The reason is that I'm about to pick switch frequency for a motor, and don't know what characterics I can expect if I alter the switch frequency. Papers and...
  30. D

    How to calculate motor torque and power

    Hi all, Description of Problem: I need to buy a motor to drive a custom-made spindle that I have made but I'm not completely sure what wattage the motor needs to be. Basically the spindle is just a hollow cylinder (closed on all sides) of stainless steel attached to the end of a shaft - the...
  31. D

    Can a Series Capacitor Create Phase Alignment in DC Shunt Universal Motors?

    We know that Universal Motors have field winding always in series with the Armature.They do not have field in shunt because of shunt fields' inductive reactance & they will produce negligible torque on AC supply. Also because of different phase angles of currents in series & shunt path, the 'DC...
  32. Z

    The angular velocity of a process control motor is (21−(1/2t^2)) rad/s

    Homework Statement The angular velocity of a process control motor is (21−(1/2t^2)) rad/s, where t is in seconds. 1.) At what time does the motor reverse direction? 2.) Through what angle does the motor turn between t =0 s and the instant at which it reverses direction? Homework Equations...
  33. A

    Working on a blower which is directly coupled with motor

    Hi everyone, I am mechanical engineer by profession. I need little help from you guys. I am working on a blower which is directly coupled with motor. Now I am plannig to shift it to Belt Drive. Purpose behind doing this was that we need to save power and avoid alignment issues related to...
  34. R

    Can Arduino solve the high starting torque issue of an electric bicycle?

    hi, i am doing an electric bicycle project. The basic improvement required would be the asist of the motor using arduino to solve for the high starting torque of the bicycle. And i don't know where should i start? Is there any comments?
  35. S

    Learn How to Create a Linear Motor Project in Maxwell 3D - Beginner's Guide

    hi. I am new at maxwell. i have work on some examples but i want to learn how can i do a linear motor project. i didnt find any examples ( pdfs ). where can i find some pdfs?
  36. B

    Energy spent by motor in a period

    Homework Statement Consider a single coil that is turning in a constant and uniform magnetic field {\bf B} thanks to a motor. The normal to the coil is given by: $${\bf u}(t)=\sin (\omega t){\bf u_x}+\cos(\omega t){\bf u_z}$$ How can we obtain the energy that the motor has to spend in a...
  37. F

    Hydraulic motor efficiency conundrum

    Hello, I'm trying to compare efficiency of different hydraulic motors by looking at unit of output per unit of input, viz: \frac{rpm × torque}{pressure × flow} I'm a bit flummoxed by one set of motor specs, for Eaton Duraforce motors, which is attached below. these motors seem to...
  38. jegues

    Buck Converter Design for PMDC Motor

    Buck Converter Design for PMDC Motor Introductory Notes: The design article followed in this post can be found here: http://my.ece.ucsb.edu/York/Bobsclass/194/References/NonIsolated/Buck/Buck%20Converter%20Design%20Demystified%20606PET25.pdf This circuit will be used for a motor controller...
  39. L

    Motor Box that rotates a threaded shaft

    Hi PF, I'm working on a problem for some guys and I need to add on to an existing machine. Attached is a back view of the machine (it's a drawing, sorry), there is a threaded rod that sticks out the back(white), attached to a motor at the bottom(black). There is a winged nut at the top of the...
  40. P

    Is it okay to increase DC motor RPM by using higher voltage

    Hello guys I'm looking for a motor for my arrow saw project. I would like to use it to cut carbon arrows. Found one motor in the shop that is pretty small and will work perfectly with my jig. But it's rpm's are only 1650 and I need at least 8000 RPM. Is it possible to increase the motor RPM's...
  41. S

    How to calculate voltage fed to motor in an H-Bridge circuit?

    So, I have been long struggling with getting a L298 motor driver I have to work. I figured it to be more compact than wiring up all the protective diodes myself so I purchased this: Where the board simply supplies a regulator, protection diodes, and a filter capacitor. Anyway, I have gotten...
  42. T

    Can Variable Frequency Drives Control Both Speed and Torque Simultaneously?

    Can a variable frequency drive with the ability to control motor torque, be programmed to run at a certain speed and torque? Or can you only control one of these variables because a change in one will affect the change in another? I noticed that in certain drives, there is speed control and...
  43. T

    Understanding Motor Driven Rollers & Tension Zones

    So I'm having a very difficult time understanding how motor driven rollers are able to create different tension zone of a moving web. Look at this for example. So is any zone between two driven rollers a tension zone? And how do these driven rollers change tension while also being able to...
  44. T

    Motor Speed and Torque Relationship

    I have a question/assumption that I'm not sure whether or not it is correct. Imagine I have an electric motor, if I have this motor spinning a load at a certain speed, can I assume that there is constant torque? That is, as long as the load isn't changing. However, if the load changes and...
  45. K

    Stepper motor for 1200 kg linear force

    stepper motor for 1200 kg linear "force" Hi all, For a project I need to bring over a linear force of 1200 kg onto a steel rod of about 10 mm. I would like to have some guidance in how I could do this with a stepper motor. How 'heavy' does this motor have to be ? I most powerful ones I've...
  46. J

    How does this kind of DC motor work?

    Homework Statement I used a similar motor to this one in a prac, and then realized that the arms either side of the coils were not magnetised. I was wondering where the magnetic field comes from, and without any special equipment is it possible to calculate it? Homework Equations t=bain
  47. T

    What is the RPM of an erector set motor with 4 AA batteries?

    This is a really dumb question that I have not found an answer for. I recently bought an erector set with a 3-6 volt motor. It has the option of 2 or 4 AA batteries. I am trying to figure out what the RPM's are with 4 AA batteries for a small hobby project of mine. I know this is simple...
  48. M

    Electric motor load vs efficiency historical background

    Is there a physicist who has discovered this, and could you explain how he/she did it? I was trying to find it on the internet, but it only gives me a lab review of load vs efficiency. thank you
  49. R

    Motor: rotating blades in opposite directions?

    I'm asking myself how can I achieve the next solution: I've a plastic case with the shape like a box, where I've 2 blades: one in the front and the second in the other. My question is how can I rotate the disks in the different direction: one clockwise and the other counter-clockwise. What...
  50. R

    Type of Motor : hub motor vs outrunner

    Dear Experts I am thinking that an electric hub motor is the same type of AC motor as a regular Outrunner motor. 1. Both are using 3 phase ac current. 2. Both have 3 power lines. 3. Both are Brushless. So, while they look slightly different, I like to confirm that both are basically...
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