Motor Definition and 1000 Threads

Homework Statement The efficiency of a heat machine is ##E=\frac{Q_2-Q_1}{Q_2}## where Q2 is the heat inserted because of the explosion and Q1 is the heat that leaves through the exhaust. It says in the book that E can be derived from the volumes ratio V1/V2: $$E=1-\frac{1}{\left(V_1/V_2...

Homework Statement I have been struggling, for over a month now, to find a way to measure instantaneous torque from a servo motor. Here's a servo that look similar to the one I'm using: https://www.servocity.com/html/spg805a-bm_standard_rotation.html I need to find a way to measure the torque...

Hi everybody, I have implemented PI control of a DC motor and it works properly at high speeds (50rad/s) but if I lower the reference speed to 5 rad/s, there are fluctuations in its motion. Initially, I thought it could be due to the limitation of my current sensor (LTS 6 np) but I added some...

Ok so I was trying to design a flywheel for a project of mine and an idea occurred to me. Why not use a gas instead of a solid wheel so you didn't haven't worry about it exploding? Could you spin a conductive gas using electromagnets situated around the gas chamber? Whats the maximum speed at...

Hi everybody. This is my first thread ever on this forum :S I'm in a first year physics class, and the other day we did a lab involving a c.c.c (current carrying conductor) and a magnet on a balance. The c.c.c was a wire which completed a circuit. One had a magnet assembly which was placed on...

< Mentor Note -- thread moved to HH from the technical engineering forums, so no HH Template is shown >[/color] Hi there. I am wondering if someone can help me.. Below is a question and answer, I need help with IV . Where does the 0.51 and 0.28 come from? I've tried cos and sin and thitha but...

Hi all Im trying to find the requirements of a switched reluctance motor but wih haven't found anything yet. Can anybody help?

Homework Statement [/B] A motor accelerates more and more a wheel without friction. It is supposed the belt gives forces F1 and F2 at only one point. http://imageshack.com/a/img674/1437/Uh0XIp.png Homework Equations None The Attempt at a Solution I would like to know if I drawn all...

A 250 VDC motor drawing 390 VDC! any one with any explanation? Thanks.

Hi guys I hope you have time to take a look at my calculation and tell me if this is possible to achieve. I have to make a project, where I have to rotate an object which will resist more and more to the rotation. The protocol is: Rotate the object with a torque of 5 Nm until the resistance...

Hi everyone, I have implemented PI control of speed of a PMDC motor under no load condition. I now intend to implement the same with a load added to it. I want to compare the results with simulation as well. Is there any way of adding a known load to a DC motor. In my set up the dc motor is...

Hi! What are technical characteristics of electromotors inside satellite dish motors? Can someone write here some models of these electromotors? Especially I'm interested about motors which carry 120cm steel satellite dishes. I think 120cm steel satellite dish is about 15kg weight. Thanks in advance

Hello Guys, I need little help currently I am working with on a Project that includes Motor Pulley and rope combination. The previous version of our Test bench was having a Motor pulley and rope and the rope was wrapped around the pulley as in most of the cases, but now I am trying to optimize...

I have to select a stepper motor for the following specifications. I need to know the torque which will be sufficient for me to get the driving torque required. Drive torque = 2.6 Nm Gear ration used for coupling = 3:1 (Reduction) Im to couple the motor with a ball screw.

Hallo Currently I am engaged with my Company's Project and it is about Electric motor as my Knowledge is not that good about Electric motors, I need your help. I want to move 80 kgs of Weight with the speed of 80 km/h with a motor and a 260 mm pulley. The motor is standing vertically and the...

Hi Im doing a project to control a 3 phase switch relactance motor using power electronics. I have choosen 3 mosfets, 2 auto couplers and 2 resistors. 1. Would there be any other devices I need ( to solder to pcb board). 2. What would the circuit digaram look like so I can solder this and...

I'm working on a senior design project. Currently I'm having some issues with sizing a motor for a large robot; everywhere I look I get different advice. I have a motor that I think will work but would appreciate some input. The specs are for our robot are as follows: mass = 350 lb = 158.8 kg...

I'm currently trying to test the motors I bought for a robotics project to see if they'll work for our application and they seem to be much weaker than what should be expected based on the specs. During test, the battery is hooked directly to the motor and I'm measuring the current draw and the...

My husband asked a question earlier this evening, which has given me pause. I've looked everywhere I can think of and came across this forum. Maybe someone here knows the answer. Why do ceiling fans (and similar residential/box style fans) go from the off position to the highest possible speed...

Hello, this is not a homework question, but is a past year exam question which I'm stumped at. Any help will be appreciated. 1. Homework Statement We're designing a current reduction system for an AC motor which is modeled as an inductor ##L##in series with a resistor ##R##. This motor is...

Hello I need guidance on selection of a hydraulic motor. Motor would be used to drive the wheel of a vehicle. Motor needs to generate a torque of 18.3Nm in order to overcome static friction and move the vehicle. And the motor needs to be small enough to be coupled with the tire (see the picture)...

Homework Statement Hello ! I'm making a simple electric motor. Using copper wires and 1.5V battery. 2 magnets, 2 thumbtacks, 1 block of wood, 2 paper clips, and approximately 2m of insulated copper wire. -The diameter of the loop must be 1" CAN'T use other materials, only the above listed...

Hello everyone, Please let me know when we press start button on screen for Motor and Den-ester in auto and manual mode why it is not starting?, which points i have to check for input and output signals from drive. And there is no error on screen. Please refer both electrical drawings. Thanks.

Hi Guys, I am pleased to join this forum to learn something from experienced guys and thanks in advance for helping me to understand physics. I am trying to design a Ferris wheel with maximum SPEED and maximum PASSENGER capacity. I want to know formula to calculate MOTOR POWER IN KW to rotate...

The title may seem dumb because increase in voltage but I wanted to have sort of like a transmission for an electric motor which again... increase in voltage which may make this idea unnecessary but I wanted to have a motor that was built like a cone within a cone so that you could slide the...

So in a cnc machine, the screw that drives the x,y,z axiis are called "lead screws". I am constructing a machine that displences fluid at percise volumes. It will be essencially a seringe with one way valves coming in and going out. To open the "check valve" it requires at least 1.5 psi. If I am...

For my assignment I have to write a report on the mechanics of an electric generator. I need to reference for physics textbooks. Anyone able to recommend some texts books that may be able to help me with this?

Hi there, I have spent quite some time on PF as an unregistered user reading through various stuff and have learned a lot. Just registered now to seek help on something that's been bothering me a lot and to which I haven't managed to find a solution yet. Please let me know if this is not the...

I want an electric motor that works a bit like a servo motor with a steering horn on it, like so: http://www.buggy-sport.info/index.php/gallery/image?view=image&format=raw&type=img&id=7191 But it needs two specific properties: - it creates a controllable amount of force along a given axis...

Hello all, A bit of background. We are communicating with a microcontroller through a desktop computer. The desktop computer controls direction of rotation of the motor, and it can prompt a step in the motor causing a rotation. However, what can I do in terms of feedback? I have not taken...

Hello all! I'm an engineering student who is taking part in a group project to design and build a UAV to carry out surveillance in Greenland. Now my specific task is to sort out our means of propulsion and materials. The problem is up to now I have only learned about petrol propulsion systems...

Hey guys. Jarfi here, I'm working on some gear, a system powered by a rotation that needs to move at least 360 degrees. Requirements: Fast rotations(used for stabilization) Fast response time needs to be able to hold a position like servos do needs to be not too big, under 5x5cm area and...

Hi,I am trying to design a simple autonomous braking system for a 4 wheel drive ATV. The system needs to be as cheap as possible. I have come up with two possible solutions. The use of a linear Actuator to activate the brake or a stepper motor attached in someway to the master cylinder. It needs...

Hi! I understand that if you have a stator with a a three phase electric signal going into it, both the frqyency and angular velocity of the magnetic field and the electric entry will be the same. Now when you feed it with 2 groups of three phases electric signals you get four poles, or at least...

The Drive terminals are connected to a PWM signal generated by an arduino micro controller. The purpose of this circuit is to isolate the arduino from the motors to avoid too much current being drawn. What I understand so far: The motor will only turn when the diode is reverse biased. When it...

So I have been curious as to the exact workings of a simple D.C. electric motor, and the transformation of electric energy into motor power. I think I have a basic understanding of the topic but there are numerous gaps in my understanding. Firstly, I think I am correct in saying that as an...

Homework Statement Hello, I am a 6th grade student trying to build a DC motor for the science fair. My hypothesis is that the dc motor will run faster if I place batteries in parallel versus batteries in a series. Is there an equation i can look at to explain what is happening? the mootr...

Many times, when I am driving my car, I worry about the tyre pressures. Why can't I have a gauge or friendly light to tell me they're ok? In my head, I have designed many different systems for the measurement and the telemetry. I realize it isn't 'very easy' but there's no reason it can't be...

Hi. I need to build a mini treadmill for my project and I had a few questions which I hope you guys could answer. The treadmill needs to run at a maximum speed of 0.4 km/hr for around 3-4 hours. I also need to be able to control the speed somehow? The weight of the object on the treadmill is...

Hope I can get some help here. I have a 1-1/2 hp. 115/230 volt single phase induction motor I want to use as a small generator. currently it's wired for 115 volt I need help with the math to calculate the proper capacitor/s to use. Running no load amps as a motor draws 18 amps. Name plate...

What are the functions of sensory,motor and relay neurons?

Hello, I am constructing a clinostat for an Experimental biochemistry research project. Physics is not my forte, and as such I would like advice on what type of low torque motor I need to rotate an 85g cylinder at ~60rpm. A diagram of the design I am using can be found here...

It needs to be 3.0in to 4in OD, the belt which it will drive will have 6 grooves. It will be mounted on a motor shaft and there also has to be a way to tighten it with a screw securely. I am having a really hard time finding one, which is understandable since they are commonly used on...

I am trying to build a laser diode driver circuit which which should give a required output of around 1.25v and 200-250mA, I have been having problems with this and want to start inspecting it with a multimeter. The only problem is, I don't have one and really don't know how to select the...

Hello all, first post on here. My fathers friend recently died of cancer and he was the person we used to turn to for this question, I've been racking my brain and searching the net for info, found this link (http://www.schsm.org/html/gear_ratio_calculations.html) and have got the ratio down...

I don't have any background in any physics past high school, so I was wondering if someone could help me figure something out. I'm trying to build a robot that involves shooting off a foam bullet from a Nerf gun at different angles. I want to have a motor attached to the center of the gun...

I have recently taken apart a few old DVD drives to see if there were any stepper motors available for a Raspberry Pi project I am currently working on. When I opened one of the older drives I found a motor which was unlike the others as it only seemed to have two wires going directly to the...

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...

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.

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...