Motor Definition and 1000 Threads

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...

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...

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...

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?

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...

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

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...

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...

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...

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...

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 = ...

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...

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 :)

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...

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

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...

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...

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...

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.

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...

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...

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...

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...

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)...

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.

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...

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...

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.

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...

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...

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...

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)...

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...

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...

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?

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...

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...

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...

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

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...

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...

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=...

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 ?

Homework Statement A coil is formed by wrapping 80 cm of thin wire round a non-conducting square of size 2 × 2 cm which is placed in a horizontal magnetic field of strength 20mT. A)Sketch the orientation of the coil that will result in the maximum torque acting, and the value of this...

Hi, I'm attempting to estimate the windage losses in an axial motor design, and I'm having trouble with the formulas. It might be a math error, or a misunderstanding of the formulas, but I seem to be stuck. An axial motor can be modeled as an annular disk spinning in an enclosure. The disk...

Homework Statement Hey, I know this is exteremely basic problem and the answer is "easy", but I can't just get the exact idea why it's so. "The starting motor of particular car has a resistance of 0,15 Ω and is powered by 12 V battery through a cable which has a resistance of 30 mΩ ...

Hi Guys, I am building an equipment to Zone 2 explosive atmosphere. Machine will be powered by the pneumatic motor. I just had an argument with my boss. He says that I need to order an atex approved motor and I say that I don't because the motor will never produce any spark. What are your...

How do I size a hydraulic motor to fit a 12" propeller to move water? I have a 35 HP diesel motor direct driving a hydraulic pump producing 16 GPM at 2000 psi. The hydraulic pump would be connected with hoses to a water pump inserted in a pipe. I want to design/build a water pump using a...

I am trying to stabilize an inverted pendulum with a physical system as follows: The measured values of the pendlums angle and the cart (runner block) position are sent to a digital controller. The digital controller then outputs a value that is sent to the motor to turn the belt pulley...

so let's say i have a motor and two sinusodial AC power supplies. they both have different frequencies but the same voltage. i apply both of them into the induction motor. what will happen in terms of speed or anything else which can affect the motor's performance?