Motor Definition and 1000 Threads

In DC motor or even in AC motor, if we use wooden frame and shaft, would it be advantageous than using Metal frame and shaft? Assume that would can with stand any temperature.

Hi, I noticed that universal electric motors have peculiar electrical <=> mechanical transfer function, which seems to break the second law of thermodynamics. Can anyone show where did I do the mistake ? ** Universal motor (series wounded) is a motor where rotor and stator...

"Involuntary motor reflex" delay while sleepy Ok, I do confess I got pat of the title from Mel Brook's movie "Young Frankenstein". That said, here is my question. I'm trying to find an extremely non-invasive way to detect when a person is losing attentiveness, or getting sleepy. FYI, I'm an...

I saw 15 Amp motor which runs on 120 VDC with 5500 rpm [This motor was attached to Miter Saw tool]. I'm not sure what's HP of that motor, but I read 5.5 HP, however the size of motor is around 6 inch long and 4 inch diameter (Is it possible this small motor have 5.5 Hp? And can we calculate...

Hi, We installed a chiller unit that had a working compressor. We turned it on, but nothing worked, after some fault finding, we found in the main panel, also newly installed, the neutral bridge was missing. This created problems as the neutrals on the chiller then created false highs on...

So I have a Gr 11 Physics Science project. I need to build a Brushed DC motor. I already build an armature with coils. I have a copper commutator and copper are connected to it. Lastly, I placed electric tape on the wood body The problem is that I don't know how to make an effective Brush...

I have a very silly question . I know how an electric motor and generator work; the changing magnetic flux and current flow causes the coil to rotate etc. and it generates mechanical or electrical energy. M question is how does turning of the coil generate mechanical energy from electrical...

[url]K-yyJF-kTMw[/youtube]I'm not 100% sure it works because I haven't built a physical prototype yet. Though, the only problem that I see at the moment is the low power density potential and the low efficiency. Meaning that it WILL NOT REPLACE conventional brushed or BL motors. I would really...

A Wheel of a self balancing skateboard of radius 7 cm is rotating at 2600RPM with torque for motor is 1.76Nm,current is 10.4Amp and 24v and total load is 90kg (10kg for skateboard and 80kg for user). What is the speed of self balancing skateboard the in km/hr with load?

how to select motor for electric bike?

Torque is the rotational force. If there is more force, how can the motor be slow? I'm building a DC motor and read that given a constant amount of coil, creating a very dense coil will increase torque but lower RPMs. Conversely, making it looser (bigger radius) increases RPM but lowers torque.

hi i am designing a gear box and i need help on calculating my motors requirements. i have a motor with rotating a gear which is connected to shaft using a gear attached to the shaft. on the top of the shaft a cylinder base is screwed weight X kg. could you please help me thank you

I've made a simple DC motor like this image: http://farm4.static.flickr.com/3156/2864655414_234d5d3207.jpg I'm just confused why initially when i increase the number of loops (about 15) it spins faster.But after this limit the speed of the rotor is no longer as fast as it was before. Why...

According to classical physics, if I take an electric motor with a resistance of 1 ohm, and run 10 volts through it, 10 amps of current will run through it. But through experiment, a lot less current will run through the motor, an average brushless motor with a resistance of less than a milliohm...

I've been looking at the undergrad catalog of my school and I haven't noticed any classes that teach motor design. I found classes on drives and motor control but nothing on the actual design of motors/generators. I always thought electric machines was a fundamental topic that all EE curriculums...

When electrons move through an armature, the magnetic field produced by the current interacts with the magnetic field it's moving through. This interaction causes a repulsion which produces the spinning of the armature in a motor. Would someone please explain what is doing the work in...

Hi, I am doing a self-balancing skateboard. It uses two 24v motor to move two wheels. I need to know if my motor will be able to move the wheels. Given that, wheel of 5.66 inches. The total weight of the skateboard = 13kg. Assume human mass = 80kg. Total weight with human mass = 93kg...

I've been wondering how does this motor work (if it is not hoax in the first place) I was thinking about Ampere's force but apparently it doesn't really have an affect here. Any ideas?

MOTOR Help! Hello Everyone, Please help regarding my DIY project. I want to make a Camera Glider/Slider which has to slide my 2-3 KG camera Horizontally, Inclined-ly as well as Vertically (Straight Upto 2 Meter High) using a Motor and a Belt. Here is the picture my project...

Hi Everyone. I've been trying to build an electrical motor and would like know the method to actually calculate the forces exerted on several parts in the motor according to Newton's laws. I've attached some pictures and drawings of the motor I'm trying to build. There are two scenarios that...

Hi there Currently in my physics class my teacher has assigned us a project where we are to make a DC motor using these items: 2 thumbtacks 1 meter of 14 AWG copper wire 2 paperclips A block of wood 1 ceramic magnet 1 AA battery 2 connecting wires My plan is something like this...

Homework Statement We have a small car that is powered by a battery that feeds a DC-motor. The system consists of two DC-to-DC converters that controls the rotor and stator current. The DC-motor i separately magnetized. The purpoce of the DC-to-DC converters is to modulate the time the...

I have an application where I am using a 24V DC motor to drive a ball screw. If someone isn't paying attention and they hit the mechanical stop on the ball screw, the current is going to spike to about 200 Amps. The normal running current is about 35 amps, and the max current is 60 amps...

Hi, I'm wroking in a project about robotics that uses servo motors. Can someone recommend me a book that completely detail how a servor motor work. If it includes robotics would be great. Thanks

Im thinking of designing a tipping trailer for a car. I need a force of 40KN exerted to tip but would this be too much for driving with an electric motor powered by the car battery. If not what size of motor and pump would I need? thanks

Homework Statement Why must the coil in an electric motor kit be wound in only one direction? Why must the current change direction every 180 degrees in the motor? Homework Equations No relevant equations. Just a simple answer. The Attempt at a Solution NI-Prentice Hall DC Motor...

Hello, I'm trying to find out how much energy an induction motor pulls over a 24 hour period when connected to a resistive load. The only data I have are the specifcations of the motor, so I can estimate how much energy it will draw based on what capacity it might be running at. Really...

I am building a homemade ropetow in my backyard. I have done a lot of research and unfortunately I have been away from physics for about 15 years, so I am having trouble calculating my motor size and transmission options. I will lie out what I am trying to accomplish below. Here are the...

Need help with motor sizing/torque calculation - Building a Ski Rope Tow. I am building a homemade ropetow in my backyard. I have done a lot of research and unfortunately I have been away from physics for about 15 years, so I am having trouble calculating my motor size and transmission...

Under no load, does an induction motor run exactly at its synchronous speed (i.e. relative field speed) or at a speed that is close to the synchronous speed but slightly less? Thanks for your time.

an 8 pole 3 phase alternator is coupled to a prime mover running at 750 rpm.it supplies an induction motor which has a full load of 960rpm find the number of poles of the motor and the slip i think the induction motor would work as a generator we can find slip by usin s=(ns-nm)/ns where...

I have been tought several times that if an asynchronous induction motor is overloaded, so that the rotor speed goes below where the maximum torque point is, the motor will become unstable, and simply stall, even if you unload it. Why does it do that? fx. here...

Hi all, I would like to install Capacitor Bank into my control panel board which contains of few 10HP induction motors. Currently I'm just able to measure the Ampere for every induction motor by using current meter. How to calculate the reactive power for 10HP 3phase 4pole induction motor by...

Hello everyone, For my physics class, I want to build an AC motor with styrofoam, magnets, screws and magnet wire. So far, I have built a cylinder of about 2.5" of radius and 1" in height with eight magnets (strengh 6/10) around it. Each magnet is glued on the side of the cylinder...

hi, i have a motor conected to mcu via h bridge but it stops rotating after few minutes.may i know the reason for this. thanks

Hello everyone, I am trying to calculate the electric efficiency of some 3 phase electric motors but I am a little confused about the power factor. efficiency=work out/work in work out=rated W of my motor (hp*745.7) work in= V*A*PF*√3 Is the work in correct? Thanks

The question is whether freight could be hauled along train tracks using only beasts of burden as a power source. My first ideas of a design involved tying, say, horses, to a belt which would drive a shaft, and, through simple gearing, provide power to push the train forward. The first few...

Is this problem as simple as I think it is? Homework Statement A 532 Watt motor is 85% efficient. How much power cannot be converted to energy? Homework Equations The Attempt at a Solution 85\% of 532W\,=\,452.2W 532\,-\,452.2\,=\,80W

Hi guys, I'm trying to design a brushless motor for an EV with temperature sensing for both the copper coils in the stator and the permanent magnets in the rotor, but I'm not sure how to add a temperature sensor on the neodymium magnets in the rotor. Wouldn't the high levels of varying...

Pulley and Motor - Torque Problem Homework Statement When the motor in the figure below lowers the m = 1140kg mass, it produces a tension of 1.04E+4N in the cable on the right side of the pulley. The pulley has a moment of inertia of 79.7kgm^2 and a radius of 0.741m. The cable rides over the...

Recommend me h-bridge ic -output rated for 4~5A - can be controlled by min 2 digital PMW inputs - optional* half step - optional* SMD 23HS8630 stepper motor specs : 6 wires , 3A / phase , 1.0 Ohm / phase , 1.8 mH / phase Thanks :D

Hello everyone For a project I'm currently working on, I need a dc motor which can generate a torque of about 0.1-0.2 Nm (or more) with a rpm of about 120-200...

So I need a motor that is able to provide \begin{equation}0.412Nm\end{equation} of continuous torque (to overcome rolling resistance). A BLDC I have is rated at \begin{equation}285W\end{equation} and 4700Kv (rpm/V). So I was wondering if my calculations are correct. Using the...

I want to learn about Induction Motors in detail (down to construction and design). But I currently want to emphasize on single phase induction motors and their design. I will be involved in motors repair works, so given a blank iron core of a motor, I want to be able to select wire sizes and...

I found this motor at a thrift shop and got it for free. I wired it up and found that it pulls a surprising .45 Amps. It also generates an amazingly effective magnetic field around it. I am scared to touch it with both hands. It seems to have a small transformer... Probably makes some mean...

I get very confused with AC electrical service, I'm a mechanical engineer so these things just confuse me. DC makes perfect sense to me. Anyway, I need to supply a single phase motor with 230V (the specs say 230V +/- 10%), so that would make my tolerance 207V to 253V. The motor is for a...

hey people,greetings to everyone i'm an freshman in physics so i have some problems understanding Newton's third law. for example how can a motor accelerate an elevator upward,or downward?i know Newton's third law acts on different objects,i understood the house and the cart problem. horse is...

Ok, I'm new to electronics and have some pretty simple questions that I can't seem to find answers to elsewhere. Let's say I have a DC motor that I want to use as a generator with the following specifications: 130 VDC 17 A 5950 RPM I know that in order to generate 130 Volts, that would...

For a special project, a team and I are trying to create our own automatic golf ball tee setter. To make a long story short, I need a motor, but I've never purchased motors before, and my EE skills are pretty weak, so I need some help... Here are some specs that I need to meet: The motor...

I have a 2.5hp treadmill DC motor and would like to hook up a controller to it. Are there any products out in circulation that would have this built into them for a salvaging attempt, or maybe a dirt cheap alternative? Heck, I would even love to make one myself if I could.