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. M

    Operating principle of a Six Phase induction motor

    Hi Sir, I have seen in many IEEE magazines that, a six phase induction motor is having two 3 phase windings spatially separated by an angle of 30 degrees electrical. I have attached the 6 phase induction motor diagram. But I am not able to understand how the motor operates i.e. how the rotor...
  2. H

    Calculating Mass of Water Pumped by a Motor

    Homework Statement A motor,rated 100W,runs from a source voltage 120V.If 2A of current flows through it then calculate the mass of water pumped by it to a height of 10m in 5 seconds. Homework Equations P=IV P=E/t E=mgh The Attempt at a Solution P=IV P=mgh/t mgh/t=IV m=IVt/gh...
  3. T

    Understanding the Relationship Between Voltage, Frequency, and Motor Control

    So I've been working with variable frequency drives recently and am curious about what they're actually controlling: motors. So I'm curious how current and torque are related. So obviously torque is a force that causes something to rotate around an axis, therefore when the motor speed is...
  4. M

    Starter Motor Torque for Electric Motorcycle Propulsion

    What is expected in stall torque from a regular car/small tractor starter motor? I measured 7-9 Nm on a starter motor I had lying around, and I'm not sure if this motor is crappy or if such performance is expected. It was fed with 12V battery and parallelled with a battery booster...
  5. jegues

    H-Bridge Control of DC Motor: Battery Bank Voltage vs Motor Ratings

    If we assume we are using an H-Bridge to control the average voltage across a PMDC motor, is it still necessary that we place a buck converter between the battery bank and the H-Bridge in order to step down the voltage supplying the H-Bridge? I've attached a schematic of what I'm reffering...
  6. siddharth23

    Calculations for LMP for certain RPM of hydraulic motor

    If I want the output of a hydraulic motor to be of a specific RPM, then knowing the pressure of the oil in the circuit, how does one calculate the LPM of the pump corresponding to that RPM?
  7. S

    Dynamo vs Motor: Exploring the Differences and Efficiency for Power Creation

    I hope this post doesn't get deleted again. This forum moderator has something stuck up his you know what. Keeps deleting posts that I make that he considers speculative. So I guess every thing we know about our universe is all we'll EVER know. Because if you can't speculate you're stuck...
  8. P

    Arduino Programming for Servo motor

    Hi all. I am working on a project that requires using an arduino microcontroller to control the motion of a servo motor. The original code is of the form: #include <Servo.h> Servo myservo; // create servo object to control a servo // a maximum of eight servo objects...
  9. M

    Downsizing motor that drive fans

    Hi, I am facing some problem can i just downsize the motor that drive the fan as currently the fan is operated at full load but the flow rate is controlled by a damper. my thought is that is it possible to downsize the motor so it will operate at lower rpm therefore we no longer need to use...
  10. I_am_learning

    Is conventional commutator DC motor still in use?

    I think most of them are replaced by brushless types or Induction Motor with VFD (variable frequency drive). Is there some industries where they are still preferred today?
  11. K

    Ball-Bearing Motor: Does Heat or EM Force Work?

    Just throwing it out there. What is your take on this? Do you think it works due to heat expansion and contraction, or due to electromagnetic forces? It was involved in one of my questions for IYPT last year and our group is still clueless about it. It seems like neither explanation is accepted...
  12. T

    Brushless DC Motor torque calculations?

    Hi there guys and girls I am new to this forum , so please have mercy. I am searching for equations to calculate the torque of a 3 phase brushless dc motor. Any info or textbooks on this maybe? Thanks Tommie Prinsloo
  13. A

    How to control motor using ESC, Ardiuno, and a potentiometer

    So I want to build an electric longboard. I have access to pretty much any machining equipment but don't have much knowledge on the electrical side of things. I know I will need a LiPo battery (I am aware of the dangers of them), and an electronic speed controller (ESC) hooked up to the motor. I...
  14. A

    Power formula for 3-phase motor

    What is the power formula for 3-phase Y connected motor. I've read that P = sqrt(3) Vt*Ia*Cos(theta) and P = sqrt(3) Vt*E*sin(sigma)/Xs Where sigma is the the angel between Vt and E Is that 2 formulas hold true for both delta and star connected 3 phase motor? and if so, Where the...
  15. B

    What power is needed to run a 48V electric motor?

    I have an 48v Electric motor with no details of the power required to drive it. This was previously powered with 8 x 6v batteries wired in series details as below: 8 off 6v 225AH Batteries Capacity in minutes: 447 @ 25amps / 115 @ 75amps 5hr Rate - 185AH 20hr Rate - 225AH This then...
  16. A

    Engineering Torque of motor varies as the cube of the speed means what?

    is this means that torque is proportional or inversely proportional to the cube of speed the problem says The torque of a load driven by a 385-V, Dc shunt motor varies as the cube of the speed. The current taken by the motor is 51A at a certian speed. Calculate the additional resistance...
  17. M

    Engineering Synchrohonous motor question

    Homework Statement a synchronous motor has ; pole pairs =3 line frequency = 50hy mechanical power P=1200W Homework Equations The Attempt at a Solution the questions are angular velocity of the rotary magnetic field = (i solved this one) number of rotations 1/min units = ...
  18. M

    Engineering Calculating Rotations and Slip in an Asynchronous Motor

    Homework Statement number of pole pairs p =2 line frequency f=50hz number of rotations n=1250 1/min Homework Equations The Attempt at a Solution question is number of rotations of the rotary magnetic field (1/min units) the slip of the machine(s) the frequency of the...
  19. M

    Engineering Schematic diagram of a 3phase voltage inverter for asynchronous motor

    hello guys, Its my first question here i hope i will have enough help i am the newbie here but i like this website already :) my question is plot diagram of a 3phase voltage inverter for asynchronous motor driving. i tried to find it but couldnt. thank you from now :)
  20. I

    How to raise RPM of 3ph inductive motor

    As the title says, I need to raise the RPM of a 3ph 480VAC motor by approximately 20%. I looked into Variable speed drives but from what I have seen, they are used to drive the motor from 20-100% of input voltage. Any ideas on what to look for? For reference, motor power is 3HP. Thank...
  21. S

    Stepper Motor Selection: Tips and Calculations for Choosing the Right Motor

    Hi, Please I want to know how to select the proper stepper motor for a particular application and what are the calculations needed. thank you
  22. C

    How Does Tesla's Motor and Battery System Work?

    So I'm wondering about Motor being used in Tesla Auto/Car and battery which powers it. From their website the specs are like this: 1] 302 hp (225 kW) 5,000-8,000 rpm for 60 kWh battery gives 317 lb-ft (430 Nm) @ 0-5,000 rpm 2] 362 hp (270 kW) 6,000-9,500 rpm for 85 kWh battery gives 325...
  23. S

    Help Needed: Looking for Small Electric Motor for 150lbs

    I do not know much about motors so I was wondering if you all could help me out a bit here. I am looking for a small electric motor that does not need to accelerate fast, but can propel about 150lbs as fast as possible when connected to a 110mm wheel. It will need to be battery operated. I am a...
  24. C

    Motor Sizing for Two Mechanisms: How to Determine Required Torque?

    Hello all, I an trying to size a motor to drive two mechanisms but am having some real trouble getting my head around the required torque. First let me explain what we have. Basically there are two mechanisms where I have plotted the speed and torque requirements on this graph as you...
  25. F

    Pulley systems and motor speed

    Hey everyone I am having problems with a pulley system. I think that my motor is too fast now I am not sure if that can affect the pulley system and actually result in it not rotating the belt on the pulley.
  26. A

    Calculating the required motor size to move a load.

    Hello, From what I've read in the stickies, this question may be more suited to this homework forum, although please note I'm not a student nor is this homework (it's simply for a personal project I'm doing), so please accept my apologies in advance if there are significant gaps in my...
  27. S

    Calculate Peak Power of a Motor Based on Max Torque & RPM

    How do you work out the peak power of a motor based on its maximum torque and rpm? I've figured out that you can get the maximum torque via (coil area) * (# turns) * (current) * (magnetic field) And I get that the peak power should be proportional to the rpm. But it doesn't seem to be as...
  28. B

    Sizing 3 Phase motor run capacitors

    Hello everyone, Thanks in advance for any wisdom you can offer regarding this matter, I just joined physicsforums.com and am now wondering why I haven't been a member all along... My crudentials: I'm an electrician that went part way through college for electrical engineering, however Its...
  29. E

    Engineering Is this motor over-excited or under-excited

    Homework Statement A three phase eight pole 50 hz star connected synchronous generator operating at nominal voltage of 6.6kv line, has a synchronous reactance of 6.6 ohm and negligible losses. When the field current is set to give an open circuit voltage of 4.5kv per phase the output power...
  30. JimiJams

    Why an electric motor is used in hybrid cars

    I've been wondering about hybrid car technology lately and I'll start with just the most basic question to try and gain some clarity. I'll ask more specific questions if they come to mind after someone explains this first question. So, I was wondering why an electric motor is used in hybrid...
  31. B

    Sizing a DC motor to move a weight and counterweight

    This might be a silly question for some but I was wondering how do I size a DC motor to move a weight and counter weight? Suggestions for a better design are also welcome. I want to build an enclosure with an automatic door (simple limit switches and an arduino to flip the motor on and off)...
  32. F

    DC Power Supply to AC Gear Motor

    Hey! I am trying to figure out the best way to run a AC gear motor off a DC power supply. Any help would be greatly appreciated.
  33. L

    Can an Electric Motor Also Be a Generator?

    Homework Statement Both an electric motor and a generator consists of coils of wires on a rotor spinning in a magnetic field. The difference is whether you desire mechanical or electrical energy as the product. If current is generated when the rotor is made to spin by either the mechanical...
  34. D

    Designing a Discus Rotator: Motor Solutions

    Hey guys looking to design something that will rotate a 2kg discus in place. I attached a simple schematic of what it will look like. I also don't know what kind of motor to use to rotate the shaft. I went to Fry's but their motors looked to weak to power it. Anyone know a site I can buy a...
  35. P

    Can gears increase Holding Torque of a stepper motor?

    Hi, I know you can use gears to increase the torque of a motor while it is rotating, but what about when it is still? Will the holding torque be any different from the case without gears? I expect that there won't be any advantage, but want to make sure.
  36. J

    Help with physics of my Magnet Motor

    The Idea The idea is similar to a pendulum in motion. I noticed that it was possible to shift the weight towards a single direction causing an immediate force, which equalized over time. I figured I could use magnets to simulate a pendulum and also reset to the starting state using both...
  37. M

    Help with pump motor control circuit from ArduPilot Mega 2.5

    Hi. I'm currently trying to build a circuit in order to control a small pump motor from an ardupilot mega 2.5 microcontroller. The pump is rated at 12 v and 3.6 w but I only need to give it about 9 v for operation. I'm using a basic supply of 9 v battery or 2 in series to give the power...
  38. B

    Tips for Rear Drive Wheel Compatibility with Output Motor | Mini-Go Kart Design

    Hey what's up guys, I am currently designing a mini-go kart type device. I was hoping someone with knowledge of these kinds of things could give me some tips. Materials in question: Rear Drive Wheels Problem: The wheels are intended to rotate with the output shaft of this motor...
  39. S

    Motor Torque required for 4 wheel drive electric car

    Homework Statement There is 14 kg of mass kept on a chassis (consider chassis weightless). Chassis is having 2 identical rear wheels and 2 Steel caster ball wheels at front. Consider the weight distribution to be equal on each of the wheel. All wheels are coupled to a DC motor-gearbox (1:1)...
  40. M

    Eddy current losses in core of a electromagnetic motor

    Hi here, I am trying to make an efficient ribbon microphone motor. My target is to get a highest possible output voltage so it can be plugged into a regular mic pre-amp. It should have possibly flat output on frequences 20Hz to 20KHz. I know that electric output depends on magnetic field...
  41. W

    Generating power using an electric motor

    Hi, I'm looking into a project that involves powering a motor that requires 60 Amp minimum input, but this is being powered from an atv/quad bike that only generated 40 amps from its existing alternator. My question is.. Can I use a motor powered from the atv's electric supply to power an...
  42. B

    Energy conversion difference in permanent magnet vs. field coil motor

    New here, hello all. My question is more about the field magnet in a running DC motor. First of all, does the current required to maintain a magnetic field change with the load on the motor? And if so, where would this "extra energy" come from in a permanent magnet DC motor?
  43. D

    Engineering Transfer equation of a Voice coil motor for dissertation

    Homework Statement I'm currently creating a PID control system for a Voice coil motor, my issue is obtaining the transfer equation that relates the voltage to the displacement. Ignoring gravity it is easy however once gravity is included I can't figure out how to rearrange it. Homework...
  44. R

    Frequency of motor power supply 60 Hz versus 50 Hz

    If a 60 Hz equipment needs to be run off a 50 Hz power supply (3 phase, AC) what are typical options? One brute force approach is to simply change motors. But I was wondering if a VFD / thyristor or some such might work? This is medium sized equipment with rating of ~5 kW. As an...
  45. O

    How to calculate motor force from power?

    There is car, that has motor with power P. From power I can calculate motor work per time: A = P*\Delta t P - power, A-work, \Delta t - time interval. \Delta t and P are known (calculations are performing by discrete time steps). Now, I want to calculate force F, that will produce car's...
  46. M

    Help with Efficiency of a motor

    This is from so long ago, I do not even know what the experiment was about any more if anyone can tell me what lesson's name or can explain to me how I can start https://fbcdn-sphotos-g-a.akamaihd.net/hphotos-ak-ash3/66969_525098604196152_1821545085_n.jpg
  47. W

    Entropy Generation of an Electric Motor: Analyzing du/dt & dS/dt

    For the following question, the solution manual sets du/dt (change of internal energy) = 0. Moreover, it also set the change of total entropy to zero. Why is that? An electric motor under steady load draws 9.7 amperes at 110 volts; it delivers 0.93 kW of mechanical energy. The temperature of...
  48. R

    Washing machine drain pump motor type

    Hi guys! recently I have changed my washing machine drain pump (looks like this http://www.yourspares.co.uk/parts/ys140670/universal-askoll-washing-machine-magnet-motor-pump-C00273407.aspx) and I am just curious what type of the motor is used? There is like a transformer on the back but there...
  49. J

    Engineering P= 1.732 X 230V X 42A X 0.85 = 10,731.06 W or 10.73 kW

    3 PHASE INDUCTION MOTOR A 15 hp/230V, three phase induction motor has a full load current of 42A per terminal. 15HP= 11kW find: a) Full load kVA input b) If the full load power factor is lagging 0.85, what is the kW input. My question: How do I know whether its connected Wye or Delta?a) kVA=...
  50. E

    Volts/hertz control of three phase induction motor.

    I am doing project on open loop v/f control of three phase induction motor. How to decide the frequency and amplitude of triangular wave(carrier wave) for sinusoidal PWM ?
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