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.

View More On Wikipedia.org
Recent contents Top users
  1. M

    Car acceleration force required to size a DC motor torque

    I'm working on making a model car, and am trying to calculate the torque required to accelerate the car from a stop to 1.22m/s in 1 second, so I can pick out the right DC motor... The acceleration required is 1.22m/s/s (~ 4ft/s) The weight of the car is 0.85 kg The drive wheels diameters are...
  2. IamDev

    Specification of DC motor for my project work?

    Hello, I need to buy a DC motor for my project work. My project involves rotation of a cylindrical disk of 1 kg, inside water (approx. 2 cm below the water level) at different speed ranging between 100 rpm -200 rpm. For this purpose I need to buy a DC motor but I am not sure of what...
  3. cnh1995

    Why does a DC series motor not reach a steady speed?

    I have a confusion about the rotation of dc series motor..Suppose I put some load on it and turned it on..Due to no initial back emf, high current will flow in the armature (and field) and due to high starting torque, the motor will start rotating at say,1000 rpm. This will induce back emf which...
  4. M

    Good energy efficient motor to use with 12 volt battery?

    I am designing a fishing pontoon boat at home. I am wanting to build into the pontoons a small water jet engine on both sides. Does not need to be jet ski type speeds. Just looking for an energy efficient motor that will exceed trolling motor speeds and still be small. I am more of a do it all...
  5. A

    Clarke-Park transform for an induction motor current

    Hi everyone, I am facing some problems in performing clarke-park transform for an induction motor(4 pole stator, squirrel cage IM). The motor is run with three sine wave inputs, 120 degrees phase shifted with each other. I am measuring the rotor position from the encoder and using twice of...
  6. A

    Using a motor to move something 90 degrees

    Hi everyone, learning a bit of hands on engineering and have no idea what to search in order to buy what is needed. I am looking for a motor that can be activated by a simple switch on a wire that will rotate a piece of metal 90 . degrees. Excuse the poor image but hopefully someone can point me...
  7. R

    Speed regulation of a dc motor

    I am having confusion about the no load and full load speeds of a dc motor. What exactly does 'loading' stand for? How do we change the loading of a dc motor ?What is the relationship between loading and the speed of the motor? Which situations does no load and full load refer to?
  8. N

    Servo or stepper motor for robotic leg?

    Hey all, simple question, when building a robotic leg (a small one, bout 30 cm with two partitions, thigh and calf) would one use a stepper motor or a servo? We want the leg to keep its position (as though it were a dc motor attached to a worm gear) and be able to lift 2kg. Any advice...
  9. P

    How Many Amps Does a Transformer Need to Run 5 Electric Blinds?

    I want to convert 5 electric blinds from battery to an ac/dc wall transformer. Each blind operates with 8 AA batteries and the motors are rated at 0.6 amp and 7.2 watt. When you hit the up or down button on the remote, all 5 motors operate at once. I want to run them off of one transformer...
  10. S

    How fast can you turn a motor before the magnet powderizes?

    Assuming the stator and windings won't burn out, how fast can a magnet rotate before it structurally fails?
  11. K

    Auto/Motor Building a mini physics motor boat -- Help?

    Should the propeller rotate clockwise or counter-clockwise? Which way will be faster and will allow the boat to accelerate the fastest?
  12. 2

    Back emf in a single loop of wire?

    I have been thinking about coils of wire carrying alternatingcurrent. From what I understand, a back emf is induced in the coil because there is a changing magnetic field around each individual loop of wire, and therefore there is a changing flux through each loop because the changing field...
  13. 2

    Do back force and back emf come together?

    i have heard it said that back force occurs in generators and back emf occurs in motors, however I was considering a motor and I thought that it seems to me that as the coil is rotating and it has the changing flux linkage, and thus a back end is induced in it by Lenz's law, this reduces the...
  14. J

    Can Increasing a Spool's Diameter Boost a Motor's RPM?

    Hi all, I have a small DC motor which turns at 20 rpm. The shaft diameter is 6mm, giving a circumference of 18.85 mm. What I want to do is get an effective rate of 30 rpm. Can I do this by simply attaching a spool or spindle to the motor output shaft with a larger diameter? If so, would it...
  15. C

    The physics behind an electric motor and induced emf?

    I am having trouble understanding a process in the electric motor. using this website as a frame of reference (http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/mothow.html), as an electric current is passed into that magnetic field, shouldn't the current also be creating a magnetic field, and...
  16. S

    Will this circuit work? what am i missing?

    hi, so i want to be able to run a motor depending on whether or not an IR detector senses IR light. so the basic idea at the start was to connect the motor with the detector and a resistor in series and therefore if there is IR the current will flow turning on the motor. I then learned that the...
  17. Superposed_Cat

    Microcontroller, LED, DC motor problems

    Hey all, me and my friend are attempting to control a 5v dc motor and make a LED blink simultaneously using a H-Bridge Motor Driver 1A - SN754410 and ATMEGA328 micro-controller(16mhz, 8bit). The issue is is that when my H-Bridge activates the motor using input from the micro-controller then the...
  18. ZelfZA

    Centrifugal force in space Motor with axle and wheight

    HI. I've read a lot of posts on centrifugal and centripetal force in space. But they mostly refer to the spinning space stations. I would like to know what happens when you take a motor with an axle and a mass on the end on of the axle, and you start the motor up.. I understand the whole law...
  19. F

    How does a SCR controls the speed of motor

    can you do it by increasing the series resistance?
  20. CJNight15

    Motor that can move possibly up to 4kg

    I'm designing a robot to compete against a friend who is also making a robot based on the Robot Sumo competitions. We decided on the dimensions of our bots and placed a 2kg limit on their weight. I'm having trouble determining what motor to use that will be able to move my own ~2kg robot around...
  21. N

    Why crawling happens in induction motor?

    It is said that crawling occurs mainly due to 7th harmonic component. Due to 7th harmonic the speed decreases by the ratio of 7. However speed is directly proportional to frequency. So speed should get multiplied by a factor of 7 instead. Should the change in frequency affect the number of poles...
  22. V

    Servo vs ? for lift/winch/hoist

    Hello. As many others here, I am starting a project that involves some engineering and will at some point, if I go ahead with it, require an engineer to design and certify. But for now I'd like to understand the principals involved and dust off some of my 1st year physics and see how much of it...
  23. J

    Why does speed of DC motor increase when flux is reduced?

    I understand that from KVL e = v -IaRa e=k(flux)speed speed=(constant)*(V-IaRa)/flux But physically what causes the speed to increase? What force causes the rotor to accelerate? In fact physically, the rotor is moving because of field flux interacting with armature current's flux. So...
  24. A

    PM Synchronous motor Id-Iq current control

    Hi everyone, I am trying to implement the current control (Id, Iq) of a four pole PM synchronous motor. I am having trouble in making the Iq current follow a set reference. I had also implemented a cascaded speed control for a dc motor. In that case, I adjusted the gains of the PI...
  25. S

    Understanding Residual Flux and Inconsistent Rotation in Stepper Motors

    Quick question: I have a stepper motor that is 0.25 degrees per step, and so 4 steps is required for a degree. When we pump 20 steps into it, it moves 5 degrees. However, if we go to pump another 20 steps into it right after that, it does not move 5 degrees. Is it possible that residual flux is...
  26. D

    Increase stepper motor voltage past rated

    So I have a 28BYJ48 stepper motor... it is rated at a voltage of 5V. I would like to optimise its speed and torque, which could be done through increasing voltage, but I know that an increase in voltage means more current i.e. will get a little hot. My question is... if I do run it at a high...
  27. D

    Calculate required torque for differential drive robot

    Hello everyone, So I am working on a differential drive vehicle... max weight 6kg and using two stepper motors centred on a circular shaped flat body. I want to try and work out if these stepper motors have enough torque to drive the thing. I am a second year engineering student, but I haven't...
  28. J

    Pressure requirements for Air Motor

    Hi Guys, I am needed to work out the the amount of pressure an Air Motor will need to provide to keep an object on a slope in equilibrium. I have worked out the the force DOWNSLOPE of the object in Newtons- but I am unsure of the next steps to find an appropriate air motor (or what kind of...
  29. nav kaushik

    How can i design a small sized high torque slow speed motor

    I have no idea about this please help me to design a small sized high torque slow speed motor
  30. Q

    Max Load Capacity: Calculating Total Torque for Dual Servo Motors

    The servo motor that I'm using says it has torque of 1.89 kg-cm. And the radius of the wheel I'm using is 3.5 cm. So i wanted to know how much load can two of these motors can together carry?
  31. PhiowPhi

    Linear force, acting on a motor?

    I had a thought that's been puzzling me this whole morning, its more related to classical mechanics, however I am dealing with motors so... I thought it would be appropriate to post the question here. Lets say we have to identical motors(with identical gears) placed vertically on a table. Those...
  32. mattyboson12

    Steam Plant Cycle Performance: Analyzing Efficiency

    I am doing an experiment to determine the performance of a steam plant cycle and analyse it in comparison with the ideal rankine cycle. I have a sketch of the actual and real T-S diagram for the steam plant (See attached) I am unsure what factors cause the change in the shape of the T-S...
  33. J

    Determining RC EDF Motor Parameters

    Hello All, I am new to the field of electrical ducted fan (EDF) jets and am currently working on a new aerodynamic design using SolidWorks and Flow Simulation for aerodynamics testing. For my computer model, I can enter data for a fan that I would like to use for the thrust of my models, and my...
  34. A

    How can I make position controlled motor ?

    I have no idea regarding it I just know that we can control a motor movement and can move it both to and fro. please help
  35. Z

    What gears to use to reduce fan speed from fast moving motor

    hey, I am building a fan, but I need the fan blade to move relatively slow, slow enough to see each panel on the blade. I am expecting to use a gear system with a belt. What gears should I use to active this?
  36. S

    Electric Motor Assignment Angular Velocity Question

    Homework Statement Hey so I've made a motor that looks and works exactly like the one in this video The assignment is asking me how I would go about finding the angular velocity, specifically " Analysis of the energy changes involved in the motor to work out the speed/ or angular velocity"...
  37. S

    How can I control the speed of an electric motor for a turning table?

    Hi, I`m going to design turning table (diameter of 60-80cm) made from aluminium, it will spin by the mean of an electric motor. I want the spinning speed to be variable, so I can control it from 0 up to 300 rpm (gradually or by steps where each step is 50 rpm) by them mean of remote control...
  38. A

    PM sychronous motor parameter measurement

    Hi everyone! I am trying to find the parameters of a surface mounted PM synchronous motor using the application note AN4680 (PMSM Electrical Parameters Measurement) and had some queries regarding it. The Ld process is mentioned as follows 1. Align the rotor to phase A. Phase A is connected to...
  39. P

    Amount of force a motor can make in 35s

    Homework Statement An electric motor develops 65kW of power as it lifts a loaded elevator 17.5 m in 35s. How much force does the motor exert? Acceleration: .5 Homework Equations F equals mass times acceleration The Attempt at a Solution Ok so I tried to find mass but when the equation was m...
  40. S

    Calculating Net Force for Motor and Driver Acceleration

    A motor and driver have a total mass of 300 kg . The driver starts moving from rest reaching an acceleration of 5 m / s2. The net force experienced by the motor of the motorcycle is I'm not sure if i did this right cause they give 60 Newtons as one of the answers. I applied Newton's second law...
  41. P

    How to control the speed of 1.5 Volt motor?

    How to control the speed of 1.5 Volt motor?
  42. P

    Ansoft Maxwell -- shaping an interior electric motor rotor

    For shaping an interior PMSM rotor from top figure to as in bottom fig, I made an equation based curve, united with another curve , made a surface using coverline and united that shape with my rotor. When validated it showed band and rotor intersecting and I adjusted the band - DiaGap. Then...
  43. M

    Engineering Using the Locked Rotor Test to find parameters of DC motor?

    Homework Statement A locked rotor test is performed on a permanent magnet DC machine with the following results: Terminal Voltage 5 V DC Input Current 10 A DC Locked rotor torque. 20 Nm a) Making suitable approximations deduce the effective rotor resistance in ohms? b) Making suitable...
  44. D

    2 speed controllers in parallel to drive a DC brushed motor?

    I am currently trying to drive a DC brushed motor, but its specs are unique enough that I haven't been able to find a suitable driver. I found one that almost fits our application but our amperage is closer to the peak then the continuous. So is it possible that I could put two of the same speed...
  45. K

    Hydraulic motor torque for a home-built flight simulator

    I am constructing a home built flight simulator and am using hydraulic motors with a arm attached to the motor spindle for movement. I need to know how much torque I would need in the motor to lift 1000 lbs. Also I need to know how fast the motor should be to move the weight 1 foot in 2 seconds...
  46. D

    How to drive a 115V 20A DC brushed motor with DC supply

    I am trying to drive a 115V DC brushed motor with a DC power supply. Most drivers I've found are for AC to DC and the 115V supply seems to be to much for most DC to DC. Has anybody worked with driving motors with large DC power supplies? Or does anybody now where I might find one? Thanks...
  47. P

    3 Phase Induction Motor Full Load Power Factor

    Hi, If the voltage, full load current and full load output power (kW) of a 3 phase induction motor are known, and the efficiency is assumed to be 90% (is this realistic), am I correct in thinking that the full load power factor can be approximated (due to assumed and not actual efficiency) as...
  48. D

    Can You Set Up 4 DC Motors in Parallel with a Variable Resistor and LED Strip?

    Good day. I was wondering if anyone could help me with the following problem. As you can see in the diagram below, I want to set up a circuit with 4 DC Motors in parallel, each with a push button switch. And a variable resistor to control the speed manually. I would like a LED strip to be...
  49. A

    Three phase induction motor efficiency

    Hi, Is there a difference in efficiency between a three phase motor and a single phase motor, in terms of power in against power out. If so, could you please explain why one is more efficient than the other. The reason I ask is because I'm researching the development of the induction motor for...
  50. J

    Motor Effect: Lorentz Force vs Electromagnets

    Homework Statement This is not a homework problem but more of a clash of terminology I have encountered for an explanation of why a motor rotates. In class, I have been taught about the Lorentz force causing the armature to turn. Where electrons in the wire experience a force when they...
Back
Top