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. D

    Using a prony brake to determine motor torque

    Homework Statement Hey guys, not much of a physicist. But, I am fairly certain I am right. We are using a "prony brake" at school to calculate torque in a motor. To me the amount of force supplied should equal the amount of force the motor can turn ie: when the motor stops the force applied on...
  2. S

    Can a 555 timer be used to control a brushless DC motor with the help of an IC?

    I have seen a link in this forum http://ww1.microchip.com/downloads/en/DeviceDoc/22263A.pdf that denotes an IC to control a brushless DC motor. How to connect it with a 555 timer? Can anyone help me with the entire circuit diagram? Thanks in advance.
  3. Blake Kopachena

    How can I reduce the speed of my lift without changing its displacement?

    I have a little project, I am building a simple lift that is moved with cable by a 3-phase motor which has it's speed controlled by variable frequency drive. I am going to be implementing PID control into the VFD via PLC that will be based off of a distance reading from an ultrasonic sensor for...
  4. R

    Measuring Torque of a Stepper Motor Using a Suspended Weight Method

    1. The problem statement, all variables and given/known data I am trying to experimentally measure the torque of a stepper motor at various velocities. I'm not quite sure how this should be done. Here is a diagram of my proposed method so far: Basically a weight is to be suspended from the...
  5. A

    Current control of DC motor using PI controller

    Hi everybody! I am trying to implement current control of a DC motor using a PI controller and was having a few questions. I am supplying 19V as input voltage (and capable of supplying current upto 2A) to the H- bridge and the controlling is done via a microcontroller using PWM. When I connect...
  6. H

    Variable low speed motor, how much can I vary it?

    I'm looking at getting a motor to drive a micrometer. It's on an interferometer mirror for the curious. I'll need around 1RPM or so, but I want to be able to vary the speed, because I'm pretty unsure about how fast I'll need it to go for my experiment to work. I'm thinking a range of like 1/4 to...
  7. H

    Delta motor behaviour on loss of phase

    Hi all, I am trying to develop a motor protection scheme for the following scenario. There are two 3.3kV 250kW delta connected motors close coupled to a gearbox driving a crusher. Both have separate DOL starters and protection systems. What happens to the motor current in a motor that loses a...
  8. U

    Calculate motor torque requide to drive a cart

    Hello, I'm in a design project of a cart. i want to decide a geared motor power and RPM. but I'm in a trouble with this because I'm unable to calculate the motor with radial friction.the cart is with steel wheel and drive on steel rails. place help. Total weight cart+carrying material - 4.5 Ton...
  9. sunergeo

    Determining correct wiring for an old washing machine motor

    I have an old washing machine that finally bit the dust, so I've decided to attempt several projects with its remains. I want to try to make a mechanical chicken plucker using the tub and motor. I've disassembled and salvaged all the useful parts and scrap metal, but when it got down to trying...
  10. Y

    How can I build a 12V DC motor controller for my fishing pole?

    I have attached a 12v DC electric drill moter to a fishing pole. I need a 12v dc motor controler or PWM that will allow me to cut the rpm's down from 550 rpm to about 20 to 100 rpm. less then 20 would work better for bottom fishing. I believe a PWM would work but I am not sure as to a...
  11. P

    What is the optimal voltage for a stepper motor?

    Hello All, I am a ME student but, I'm trying to teach myself EE. I am testing out a stepper motor. Here are the specs for the motor: Rated Voltage: 5.7V Rated Current: 1A per Phase Resistance per Phase: 5.7V I am using 15 VDC and want to make sure I don't blow the motor. Using Ohm's Law...
  12. P

    Low Speed High Torque Motor for 5kg Rotating Project

    i want to ask something about an engineering project i am working on. I need a motor to rotate a 5 kg with less than 5 rpm(low speed high torque motor).please help..
  13. N

    Reversing Taifu QB70 single phase AC motor

    Hello Guys, I got a Taifu QB70 water pump. But no more in use, I wish to use this motor in a gate opener project of mine. However I cannot figure out how to make the motor rotate in a reverse direction. What I tried ? 1. I reversed the position of the capacitor thinking it would...
  14. J

    Synchronous Motor Capacitor Sizing

    I am troubleshooting a 1967 GE synchronous motor used to run a reciprocating compressor. It is a 1000 HP machine. I am trying to figure out the size and purpose of the capacitor connected to the DC field. Is it there to absorb voltage fluctuations? The capacitor has burnt up and can't be...
  15. H

    DC Motor auto-reverse at low RPM

    Hi All, Much respect and admiration to the majority of you highly ordered beings. My question is a simple one I hope, how can I get a 24v DC motor to reverse ~half a rotation when forward RPM get low (0-10)? Thanks
  16. P

    What are the equations for selecting a motor for an RC plane?

    Good day, I am starting to design a new cargo RC plane and I end with this trouble. I want to select a motor but I do not know the required trust. Is there any equation or steps that I can apply to decide the motor?? Thanks!
  17. J

    Help selecting the proper size PWM for a motor

    I'm building a machine using a 3-12VDC gear motor, 1.5A draw no load, stall at 25A. Would a PWM rated at 6-90V 15A 1000W be an appropriate controller? These two items: https://www.amazon.com/gp/product/B00HTZSK5Q/?tag=pfamazon01-20 https://www.amazon.com/gp/product/B005IR1NBA/?tag=pfamazon01-20
  18. M

    Have 12v AC, converted to 12v DC, motor slow

    Hello All, I have a stater that puts out AC voltage, at max RPM it produces 40 volts. I have a voltage regulator installed parallel and it controls volts to max 14+v AC. I need to run an 80 watt 12V DC cooling fan so I installed a little block that has 4 diodes inside. Possibly this is...
  19. P

    Optimizing Motor Load Power Calculations for Load Flow Analysis

    Hi, If you are entering motor load data (Real and Apparent Powers) into a power system analysis software so that a load flow analysis can be conducted and you are calculating these powers based on current and voltages, do you assume and use the full load power factor for the motor, as...
  20. N

    Calculating the power developed by the motor

    Homework Statement Homework Equations A few basic conversions/equations: 50km/h = 13.89m/s ω = 13.89/0.3 = 46.3 rad/s Torque = Force x Radius Power = Torque x Angular Velocity The Attempt at a Solution Solution is already given above in the picture, but I am confused by...
  21. D

    Read motor datasheet to march demands

    Hi guys, I want a linear stepping motor to be able to apply an equivalent force 10 Newton to push a syringe. How do I read the data sheet here : http://www.haydonkerk.com/LinearActuatorProducts/StepperMotorLinearActuators/LinearActuatorsHybrid/Size11LinearActuator/tabid/75/Default.aspx To...
  22. R

    DC brushless motor vs. AC motor

    I noticed that common technology such as brushless DC motors use AC to drive them. What exactly makes DC brushless motors different from AC motors if they both ultimately take in AC? Why even refer to DC brushless motors as DC motors if they're not even driven by DC? I understand the source is a...
  23. M

    Solving Motor Stall Current Issue: Tips and Tricks | Master Project Update

    Hi, I am currently doing my Master project and unfortunately did a rookie mistake. My DC motor is mechanically linked to a loaded PMA (wind turbine generator) and I need to run it at a variable speed. All this is built, however when choosing my PSU, I forgot to take into account the stall...
  24. Y

    Super capacitor for running DC motor

    Hi, I am planning to run a DC motor using a super capacitor. The specification of the motor are: Voltage : 90V - 120 V DC Current : 15 A Duration : Should run for atleast 10 seconds. I have finalized this super capacitor from maxwell for the above operation...
  25. Austine-J5

    What type of motor is best for powering a homemade helicopter?

    Hello guys, I have a project I intend to embark on,actually it a helicopter,but I still can't figure out the best type of motor to power the blades of my design. I need something light,small and POWERFUL. I look forward to your contribution. Thanks in advance.
  26. S

    Linear motor with permanent magnets. Where is the sticky point?

    Hello, recently I have found this diagram http://www.cropcircleconnector.com/images/part4-12.jpg Also seen some videos on youtube. If this really work in moving a magnet linearly, the first thing that someone may think is why not to combine this linear motor into a circle, to move a magnet...
  27. L

    DOL Motor Starter can support 160KW, 1000KVA Pump?

    Hello! Everyone, I am Lincoln from Singapore. I am from mechanical background. Recently, I am handling a rain-water tank with sump pumps project. May I seek you guys who are in electrical expertise for some professional advice for the following: Is the DOL starter possible to support...
  28. S

    Using Motors for Motion: Ask Your Questions Here!

    Hello guys. I'am new here and i have a question. how can i use a small motor to spin several small devices? Thank you.
  29. M

    Single phase Induction motor Design

    I want to design a single phase induction motor (1/3 HP,50Hz,220V). I face a problem to design the main dimension of stator and Slot shape and Rotor skew angle . Would you give some idea for design ? or any related book and software ?
  30. N

    Stepper motor increase rpm but keep torque

    Is it possible that I keep the typical working torque but increase the rpm by raising my voltage to my motor? I have this motor and control board: http://uk.rs-online.com/web/p/stepper-motors/3514631/ http://uk.rs-online.com/web/p/stepper-drives-indexers/2407920/?origin=PSF_421243|acc...
  31. S

    Help with linear motor, magnetization?

    Hello, attached is a picture of a cylinder magnet moving in and out of a coil, in a linear AC generator configuration. Below it, there are 3 possible configurations for the magnetization of the magnet (axially/diametrically/radially). Which of the 3 configurations will produce more voltage on...
  32. C

    Three phase Induction Motor torque/slip HELP NEEDED

    Hi, I'm really stuck on this assignment question and could do with a hand on the step by step process of how to get the answers. A three phase induction motor as 2 poles, a standstill voltage of 121 v/phase (Er), rotor resistance of 0.15Ω/phase (Rr) and a standstill rotor reactance of...
  33. C

    Mechanics of electric motor to drive shaft by chain drive

    Hi! I would like to change my work truck into an electric hybrid. I have all the electrical portions of this project handled. My big problem is somehow connecting the motor to the drive shaft. The motor is going to sit in the bed of the truck. Its a twelve foot box truck, the motor will sit...
  34. D

    Motor Powering Generator Efficiency

    What do I look for to determine the efficiency factor to know how many watts I can get out of a generator given a specific known HP sized engine? Example: 12.6 HP gives 9395 Watts from the standard HP to Watts conversion... however on a Markon generator, the spec sheet says that a 12.6 HP...
  35. H

    Induction motor and sequence reactance

    Hello! This is my second post about sequence reactances. This time- its in induction motor. To my understanding ( once again ) - In any network (symmetrical or unsymmetrical) , there would be 3 components- positive sequence component, negative sequence component and zero sequence...
  36. D

    Engineering Predicting Motor Performance?

    1. Hi, the question is "A simple D.C motor has been constructed using one pole pair having a square surface of 6cm × 6cm and produced a flux of 18mWb. The commutator has 4 segments, which allows for two simple loops to be connected. Two brushes are used with the positive applied to the brush...
  37. M

    Ideas on how to fasten to a motor shaft

    I have a rubber wheel that has a 1/2" plastic bore with a key slot in it (see attachment). I want to spin that wheel with a motor that has an 8mm straight shaft. I need some ideas on how to fasten the motor shaft to the wheel. I want to have a bearing opposite of the motor to keep the shaft...
  38. S

    Engineering Problem with induction motor

    Homework Statement A three phase cage rotor induction motor running at full load draws a stator current of 60A at a power factor of 0.8 lagging from a 415v, 50Hz Supply. Under the conditions the stator loss is 3.6kW, the rotor loss is 1.3kw and percentage slip is 4.5%. If the shaft power...
  39. C

    Calculating Output Torque of a 3hp Motor

    I have a 3hp motor, with a torque of 110.85 lb*in. a gear box with a max torque of 6286 lb*in. gear box ratio is 57.64:1 I have gears attached to the gearbox shaft with a gear reduction of 3.375:1. My new gear ratio should be 194.53:1 right?... which would make my output torque approx...
  40. R

    Rotating motor dynamics: reactions on supports.

    Homework Statement Hi everyone! I'm struggling to understand how to solve this problem, I searched on the web, but I didn't find anything similar. I have a motor delivering a power P=5kW at n=1500rpm. This motor is mounted on 4 supports, each having a rigidity k=15kN/m. I know that distance...
  41. G

    Does decreasing input voltage affect the slip in an induction motor?

    Hello all My question is: Induction motor with nominal load rotates with nominal speed. How the slip will be changed if we decrease input voltage in 10%? I think that if we decrease the voltage, than the current will be decreased also. Than, the moment will be decreased and mechanical...
  42. Q

    Power Factor Correction - Capacitor Sizing wrt Motor Speed

    Please have a look at the following links: http://www.eaton.com/ecm/groups/public/@pub/@electrical/documents/content/sa02607001e.pdf (Table 3) http://www.electrical-installation.org/enwiki/Power_factor_correction_of_induction_motors FigL24) - For power factor correction, why would the...
  43. T

    Electric Motor Question: Round 2

    So I recently asked a question regarding the power consumption of an electric motor. The load that the motor moved equated to approximately .02 horse power. Because acceleration was very slow, the inertia of the motor rod/components should not be of too much concern. However, I understand that...
  44. B

    Rotating parts of a motor have a moment of inertia

    Homework Statement The rotating parts of a motor have a moment of inertia of 15 kgm^2 and an optimum running speed of 1400 rev/min. When operating the motor is connected at optimum speed , by means of a clutch, to a shaft which has a counter rotation of 600 rev/min. The shaft has a mass of...
  45. T

    How Should I Determine the Correct Power Rating for a Motor Winding Paper?

    Hello, I'm trying to size a motor for an application that I'm working on. The application involves winding paper with two motors. One motor will unwind and the other motor will rewind. However, I'm trying to figure out what the motor power rating should be. Here's the worst case scenario...
  46. P

    Instantaneous torque in a 3-phase motor

    This isn't a homework question because nobody assigned it to me. It is a theoretical question however. I understand that in a balanced 3-phase system with a constant load, instantaneous power is constant. Not "pretty constant" but a flat line. This suggests to me (warning: amateur) that...
  47. F

    Permanent magnet motor working on repulsion force

    Sir what would be the life of permanent magnet motor which runs by the repulsion of north pols. Is magnets energy wasted during this repulsion process or not. Because it continuously work on repulsion of two north pols.
  48. T

    Engineering (DC motor derive ω expression with respect time

    Homework Statement I try to derive the expression of ω with respect to t, but the problem is the armature current Ia or the flux is unknown. I don't know how to solve it. Anyone could give me ideas? Thanks a lotHomework Equations τ=J(ω/t) Vs=IaRa+Ea T=KEøIa Ea=KEøω
  49. L

    Engineering Short circuit calculation small network: gen motor transformer cables

    Hello guys, I have to make a short circuit calculation for school but I am a bit lost.. I have a copy off the IEC61363 and internet connection as my help lines. Homework Statement The network consists of a generator feeding to switchboard A with a cable in between, on the same...
  50. S

    Engineering How does current affect the speed of a DC motor

    Say I was run a homemade motor using a 9v battery, and then ran it again using two 9v batteries... would it go faster with the 18v?? Cheers
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