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. Jumponright

    Maximizing Angular Velocity of a DC Motor: A Capacitor-Motor Circuit Analysis

    Homework Statement Hi all I am doing a school physics project and I am trying to find the maximum angular velocity of a DC motor. I have built a circuit consisting of a charged capacitor (of known voltage) and a motor. I then try to predict the maximum angular velocity attained by the motor...
  2. D

    Maximum voltage and current values for building a DC motor

    Hello, I am building a large DC motor for a Go-kart. I have a question: How would I know how much voltage and current (the maximum values I can use) I need to make the DC motor work and spin? I'm guessing the armature size and the winded wire's length depends on how much voltage and current...
  3. D

    How do I build a powerful DC motor for a go-kart?

    Hello, I would like to start building a simple DC motor Go-kart, but I would like to build my own DC motor for it. A simple one that can make the car move. I know how DC motors work and I understand the physics of it, but I'm not sure about some things: - Are all DC motors (large or small) the...
  4. cnh1995

    How does field rheostat resistance affect the speed of a DC shunt motor?

    Suppose a motor is run at 1500 rpm and field rheostat is at minimum position (say 10Ω). Then the field rheostat resistance is increased to 100Ω and the speed obtained is 1700 rpm. Now the motor is shut down and started again. Will it now run at 1700 rpm? My logic: No it won't, because: the...
  5. V

    USB Battery Array -> Power 36v Motor

    I'd like to take several of these (or similar) usb device charging batteries (http://www.ianker.com/product/A1271011 ) and connect them into an array to create a minimum of 36V and channel that to power a speed controller for an electric vehicle. Is this possible? Would I be able to prototype...
  6. C

    Engineering Induction motor torque formula

    I am learning basic motor control and there is a formula list in my book. The last one is for torque calculation, can anyone point out to me where this one is from or how is it derived?
  7. S

    Working principle of quasi Halbach moving magnet linear motor

    Hi i can t understand the working principle of quasi halbach moving magnet linear motor. i read ''the quasi-Halbach magnetised armature generates a magnetic field which links with the single-phase stator coil, and a reCiprocating thrust force is produced as the result of the...
  8. N

    Motor torque calculation for Intermittent pull

    Hello, I am working on selection of motor for intermittent wrapping steel strip on a reel, intermittent because system is equipped with a sensor which triggers motor after the strip reaches a certain level in the buffer box and then motor stops when the level of strip falls below another fixed...
  9. Thom_Silva

    A Rotating motor compressing a spring

    Hello, I've recently came across this video (), where the authors use a motor to compress springs and therefore achieve locomotion. I've been thinking why is there a resulting downward net force. But i can't really figure it out. Thank you for time :) See the video from 1.16 minutes and...
  10. S

    How to Use a 12V Motor as a Generator for a Heating Element?

    What output does a 12v motor give. I need to power a heating element that requires 12v, can I do this with a 12v motor? If not what size motor do I need? Thank you in advance for any help Sarah
  11. E

    Lap Wound DC Motor Simulating

    Im looking to simulate a lap wound permanent magnet brushed DC motor and am looking for advice on the best program. I've carried out some calcs in excel and wondering if I can simulate the motor in solidworks or Ansys to optimize placement and size of components in order to maximize efficiency,
  12. P

    Maximum Angular Velocity of an Electric Motor

    Hello! I was looking to find out about an equation that would tell you the maximum angular velocity an electric motor can put out in terms of the geometry of the motor (area of the rotating coil, number of turns, etc), the EMF applied to the coil, magnetic field surrounding the coil, and so on...
  13. S

    Powering 10HP 460VAC 3Phase AC Motor: Transformer?

    Does anyone of a transformer that can step up 120vac to 460vac? Or do I need to use two transformers and step it up twice? It is powering a 10hp 460vac 3phase ac motor. Thanks.
  14. P

    Angular Velocity of Electrically Powered Motor

    Hello! This isn't a homework question, and I don't think it is too homework-like, but if I'm mistaken I apologize. My question is if you had a battery, or some source of electrical energy, hooked up to a coil of wire in a constant magnetic field, in such a way that the wire spins around...
  15. N

    Using a motor or alternator to generate electricity

    I'm looking into building a 7 1/4 gauge Diesel Electric Locomotive I will be using 4x 1hp (or 1 1/3hp) 24vDC permanent magnet motors for the traction motors. What I am looking for is someway of generating 24vDC with a 100-150A max output. (Im using a 3cyl 16hp Diesel engine to drive a...
  16. B

    Changing an ERM (eccentric rotating mass) motor

    I'm not well versed in electrical engineering, but I was looking at this. http://www.precisionmicrodrives.com/vibrating-vibrator-vibration-motors/pager-motors-erm-motors It suits my needs for a project, but I need to modify some aspects of it. In layman's terms, can someone explain to me how I...
  17. C

    Induction motor vector control stator current vector

    I am new to flux oriented control and i read that this method is to decouple the stator current, one component for flux producing and other for torque,so that so that we can control these two current components to control an AC motor like a DC one(right?) However when i try to dig into detail...
  18. M

    Is there a resultant holding torque in the rotor?

    Hi, sorry for the title. I struggled to accurately describe my question in a short sentence. I'm trying to understand if there would be a holding torque or not in the following scenario. I'm referring to a motor which has a central stator and two permanent magnet rotor plates on either side...
  19. D

    Predicting DC generator response

    I am creating a scale model wind turbine using a DC motor as a generator and would like to predict the motor response analytically. Generally speaking, the flow will spin the rotor (as in the turbine's), which will spin the motor, and then there will be what I'm calling the motor response, and...
  20. L

    Why does a 90° phase shift maximize induction motor torque?

    Capacitor-start induction motors use a capacitor in series with the start winding to create torque to start the motor. After the motor gets nearly up to full speed, a switch takes the capacitor out of the circuit. I understand the torque is caused by the phase shift created by having the...
  21. cnh1995

    Induction motor as transformer

    It is observed that the stator current of IM increases on loading. In transformers, the increase in primary current due to loading is significant . Is it same in induction motor? Does the air gap affect it?
  22. J

    Troubleshooting 1/8 HP Motor w/ SCR & Relays

    I am using an 1/8 HP motor with an SCR type dc drive and 1/4hp AC single phase control relays. I keep having a problem with welded relay contacts. Should I go to 1H/P relays? I don't know why I would have to being the HP of the motor is lower that the relay?
  23. J

    Achievable torque from regenerative braking

    Hello guys, I have been trying to calculate the maximum torque that can be applied to my driveline through regenerative braking, using the equations from this paper: https://smartech.gatech.edu/bitstream/handle/1853/47660/sambamurthy_aravind_201305_mast.pdf?sequence=1 I have been using the...
  24. L

    Build electric washing machine from saw motor

    Hi everybody, I've been trying to find instructions on how to build an electric washing machine but am not having any luck! I found non-electric manual operated makeshift washers, but I need something with a little more oomph! The closest thing I've found is someone made a power saw from a...
  25. S

    Selecting a BLDC Motor for an Electric Tricycle | 400W, 48V, 0-4m/s in 20s

    We are designing an electric tricycle having rear wheel drive(26 inches wheel dia).It will weigh around 400kgs including drivers. There are constraints for motor output power(max 400 watts) and voltage(max 48v). What are the calculations to be done for the selection of motor. The desired speed...
  26. D

    What voltage should my motor be?

    I'm making an electric scooter but it's not just your average scooter. I'm going to connect it to some solar panels so it can run off of solar energy. But since this is my first time experimenting with electrical engineering stuff, I have no idea which motor I should use. I'm thinking a 12 volt...
  27. S

    Gear Ratio & Voltage/Current Calculation for 24V 1500rpm BLDC Motor on a Tricycle

    I have a 24V, 1500rpm bldc motor.The power output will be around 400W. We are using it to electrically drive a tricycle. How can I calculate the gear ratio to decrease the rpm and increase the torque? The transmission system includes an intermediate shaft with 22 teeth sprocket and 44 teeth...
  28. D

    Hello Everyone....Single phase induction motor design

    is there anyone who knows a company that can design single phase induction motor prototypes in the UK..Thanks for your help
  29. T

    Induction motor equations question

    Homework Statement I came across these two equations in a chapter on induction motors, and I was wondering if they both calculate the same thing? ##w_r=sw_s## ##w_r=w_s - \frac{p}{2}w## Homework Equations The Attempt at a Solution s is the slip, ##w_r## and ##w_s## are the rotor and...
  30. E

    Is there enough torque in the motor for the system?

    Good morning, I have little problem here and I've come here with hopes of a solution! I'm currently messing with a rotary to linear pressure cycling system. The size of the air cylinder has already been decided and I'm simply trying to design around it. Here are the specifics! I've added a...
  31. T

    Finding out Kv motor velocity constant

    Hello, If I take a DC motor and put it in generator mode, what will happen if I connect a resistance at the wire ending of the DC motor? Will the motor turn slower compared to when the electric wire of the motor is connected to nothing? What effect will the resistance have on the current...
  32. R

    How to calculate the minimum torque required for a motor?

    Hi i want to choose a motor for a project i am working on and i have a structure weighing approx 2kg which is to be run at 1000 RPM. So my question is what should be specifications of the motor i am to buy ,more specificly the torque required to run the structure and the power rating? i was...
  33. T

    Line current three phase motor in six step commutation

    Hello, I have got a three phase motor connected in delta that is controlled in six step commutation. When I measure the line current of one of the phase under oscilloscope, I got something like this : Can anyone tell me why the amplitude of the current isn't 3.1A and -3.1A? What I got here...
  34. A

    Lorentz force in motor other than homopolar

    Hello, I am trying to build a motor. Just a prototype I guess and learning at the moment so just simple stuff but I can't make it work.. I have seen the examples of a homopolar motor and understand the direction of force due to Lorentz force. To be simple I don't want, and don't see the need...
  35. A

    No Control Over DC Motor Speed After Bearing Change - Help Needed

    After bearing failure of 24V, 15A dc motor. We change the bearing of the dc motor. But after changing it the motor is running forward/ reverse but there is no control over the speed. Where is the problem? Is that in the techo or drive card? Any body please help. Helping in highly appreciated...
  36. V

    Influence of Motor Winding End Turns On Torque

    What is the effect of motor winding end turns on torque for small DC brushless motors.? Many state that end turns have no effect on torque and that the only influence is from the winding portion in the stator slots. My belief is that because the end turns on small brushless motors are still...
  37. OnLy-_-1

    Eletric motor with wind turbine (And in side small generator

    Hello all my friends...! This is my first discusion about this type of discusion , so let make long short story i read people from 2009 want to find way how to use wind in car producion or self use... I was thinking let me try to find way to get solution on that problem so after long thinking ...
  38. D

    How to measure and control the torque of a motor?

    Hi, I have a motor with no information, not even a label, just the connectors, I was wondering if there was a way to measure its power and if there was a way to control it without affecting it's velocity, I possesses simple elements, some sensors (inductive) and a manometer, my brain is now dry...
  39. E

    Free body diagram of a wheel driven by a motor

    Neglecting drag, I'm trying to understand how a wheel driven by a motor on a level surface rolls without sliding and experiences constant velocity. I'm trying to construct a free-body diagram. The wheel has a weight and a normal force acting on it in the vertical directions. The sum of...
  40. T

    Calculating Phase Resistance for BLDC Motor: What Factors Should I Consider?

    Hello, I have a three phase BLDC motor and I am trying to figure out its phase resistance. I have acquired the three-phase voltages and three-phase line currents of this motor. The voltage is in trapezoidal form whereas the current is in rectangular form My question is: how can I find out the...
  41. N

    Single Phase Motor: Questions Answered

    Dear expert, dear all. As my knowledge, the single phase motor is not a seft-starting motor. i suppose that there is only main winding in single phase motor. as you know, the rotor can not start because of the 2 opposites force cause by 2 oppositely rotating magnetic fields. the question is...
  42. smruti

    Traction application -- Which type of motor is best?

    in traction applications which motor is best suitable? previoulsy dc series motors were used in traction applications due to there excellent starting torque.but now a days it is being replaced by induction motors.why can't we employ synchronous machine in traction application?
  43. S

    DC Motor for 6kg Aluminium Disc at 1600rpm

    hello, I need to rotate a circular aluminium disc with a Battrey powred DC motor. I am having problem in finding the right kind of motor. The total mass of the disc is 6 kg, radius of 30 cm and have to be rotated both horizontally and vertically. I need to rotate it at 1600 rpm. So what would be...
  44. T

    Understanding the Voltage Equation for a Separately Excited DC Motor

    Homework Statement Homework EquationsThe Attempt at a Solution For the textbook diagram of a separately excited dc motor, the voltage equation for the armature circuit is given as ##V_t=E_a + I_aR_a## But in the class notes, it says ##V_t = V_a## Firstly, I don't know if the ##V_a## refers to...
  45. T

    DC Motor: Solving for Load Speed w/ Torque Relation

    Homework Statement A machine, with an armature resistance of 0.16 ohms and K##\phi## is to drive a load that requires a torque that is proportional to its speed. One point on the mechanical torque-speed relation is 16 Nm at 400 r/min. If the armature terminal voltage is 50 V, at what...
  46. S

    How Many Turns are Required for an Induction Motor in Different Voltage Levels?

    I want to known the stator design of an indiction motor. How may turns required for each pole. For exmple if a single phase motors is designed to run at 230v ac, how may turns required in each pole. If the same motor is designed to be run in lower voltage (say 110v ac or 12v ac) what will be the...
  47. AlexiaIoannou

    How to design a single phase induction motor

    Hi everyone... I have to design a single phase induction motor. I have some questions and it would be great if you could help me. The parameters I have for the design of the motor are: rated power, rated voltage, frequency, rated speed, power factor, efficiency, full load current and full load...
  48. C

    Substitute a gas motor with electric motor

    I'm sure that this has been posted before but... I want to substitute a gas motor in my 12kw Generac home backup generator with an electric motor 48-volt 4hp@4000 rpm series.. I would run this electric motor from the grid and power my home from this newly design generator.
  49. B

    DC Motor & Drive: Find the Perfect Match for Your Needs

    Hi there, I've been looking through the web for hours but I cannot find a DC drive that can do everything I have in mind. After a few hours and being thoroughly confused. I was wondering if someone on this forum would be of any help. I'm trying to buy a 0.5 HP Permanent magnet DC motor to...
  50. Matthew Titus

    Engineering Torque calculation to determine motor size

    < Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown > Hi guy's this is my first post so forgive me if i leave anything out. I'm designing a solar tracking device that needs to be mounted on a roof and i need help calculating the torque required...
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