This is my first time here, I'm hoping I'm asking this question in the right place. If I do, then I think I will frequent this sub fairly often in the next few months.
I have a project where I need to (among other stuff) control an AC motor from far away. Changing the direction of the rotation would be enough, but also being able to completely turn it off would be nicer.
The motor in question: https://www.elektrobot.hu/termek.php?filename=3918.html&i=3918
For the project, I want a central controlling unit, likely a microcontroller that I haven't decided on yet. I want to use this controller to operate some kind of switch that I can use to change the motor's direction of rotation or turn it off. Right now I'm only interested in the actual hardware part that would do the switching that a simple and cheap microcontroller would be able to control with their usually low output power. I've tried to search for it myself, but didn't find my answer, the closest thing I got was an SPDT switch, which wouldn't suffice since it's a manual switch, and I need to be able to do it from far. Well, not necceserally far, but the point is that it shouldn't have to be done manually, but over some software interface.
Edit: the webshop isn't in English, but at the bottom there's a datasheet for the motor in English.
Hello all, I would like to use the turntable motor from a scrap microwave in a project. Hooking this up to my 120 V AC turns it on fine however I just watched this video https://youtu.be/otQGdPLyF3w?t=355 where he mentions using a capacitor and looks like a resistor to reduce the inductive load on the grid. I tried to see if I could find something clearer online so I could do this as well but couldn't find information. Can anyone help in explaining the capacitor size I would need and what resistor that is? Again for the US 120 V. Thanks for the help, I am still learning electronics so any clarification would be grateful https://imgur.com/a/D1VAQQS
Stratistics MRC's report on Global Permanent Magnet Synchronous Motor Market discusses about driving factors, opportunities, mounting type, type, power rating, voltage range, control, application, sales channel, and upcoming challenges.
https://preview.redd.it/pfgmdtwvljy71.png?width=1118&format=png&auto=webp&s=34a08e98d4bb9982ee8fa8e813eef5b48658627c
Permanent magnet synchronous motors (PMSMs) are AC synchronous motors that receive field excitation by permanent magnets. These motors have sinusoidal back-EMF and are similar to brushless DC (BLDC) motors. PMSMs provide durability as well as electric stability and ensure reliable performance.
View complete Permanent Magnet Synchronous Motor Market with Table of Content @ https://www.strategymrc.com/report/permanent-magnet-synchronous-motor-market/toc
By geography, Asia Pacific is going to have a lucrative growth during the forecast period due to rise in industrial activities, standardizations on the usage of energy-efficient motors, and advantages of PMSM over other electric motors.
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Some of the key players profiled in the Permanent Magnet Synchronous Motor Market include Alstom, Baldor Electric Company Inc (ABB Group), DRS Technologies Inc, Emerson Electric Corp, General Electric Company, Hansen Corporation, Hitachi Ltd, Johnson Electric, Mitsubishi Electric Corporation, Nidec Corporation, Rockwell Automation Inc, Rolls Royce plc, Siemens AG, Toshiba Corporation and Zhejiang Zhongyuan Electric Co Ltd.
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Related Markets:
I am comparing async induction motors with synRM and PM motors and noticed that, although the efficiency of a SynRM motor is a bit higher compared to induction, the current is much higher. Example: 110kW 4pole @100% load. IE5 synRM: eff: 96,8% - 243 amp IE4 async induction: eff: 96,3% - 194 amp IE5 PM motor: eff: 97,2% - 191 amp This difference in current is Around 20% which is a lot. Now the only way I can explain the much higher current of the SynRM is that the VFD would sent out a much lower voltage level @ full speed but: A) is this correct? B) would this mean thicker cables between the drive and motor compared to induction and PM? C) in the end the energy company charges us the kWh we use. As we need more current for the synRM would it not mean a higher energy bill and CO2 footprint? Any other advantages/disadvantages of synRM compared to the the other types of motors?
Hi, I am trying to calculate the Xs (synchronous reactance) of a 50 kVA (~25 kW since it has a 0,5 power factor) SPSM. The way I am doing so is by simulating it with a FEA software since I don’t have the actual physical machine.
To calculate Xs I used the Behn-Eschenburg method (Swedish method), where Xs=Ifk/Ifg. Ifk being the field current (rotor DC current) needed to get an induced voltage equal to the nominal voltage in the short circuit test. Ifg being the field current (rotor DC current) needed to get an induced current equal to the nominal current in the open circuit test.
Can anyone tell me what normal values for Ifk and Ifg are?? From my simulations I got Ifk=6.335 pu and Ifg=0.6275 pu which yields a Xs~10 pu (way too big)
Apart from the fact that I think that breaks Ohm's Law V=IR. No increasing I without reducing R or Increasing V.
Why do they need to draw more current?
When load increases the torque angle changes. And because of this there's more torque without changing the speed.
The magnetic field values don't change only the distance between poles change causing more torque.
If the field magnitudes don't change how is more current drawn?
And if the fields change - how do they draw more current. Aren't resistance and reactance constants. Thank you.
P.S: If I've assumed something wrongly please point it out
Will there be an instance that synchronous machine operates as a generator and a motor simultaneously? Or if not, is it possible for the machine neither operating as generator nor motor?
Electric motors have been a necessary component of modern manufacturing. They transform electrical energy into mechanical energy, allowing industrial machinery to complete tasks. Although not all electric motors perform the same functions, some are engineered especially for a specific industry.
We can define a synchronous motor as the movement of the shaft in the stationary state of an alternating current motor that is synchronous with the frequency of the applied current.
https://preview.redd.it/73lmjbft14f71.jpg?width=482&format=pjpg&auto=webp&s=da984253d6d794a1d87ac2470556f16fd4970c43
The synchronous motor has multi-phase AC magnets on the stator that creates a spinning magnetic field, unlike the induction motor. The rotor in this case has a magnetic field that rotates synchronously with the frequency of the current supplied and is instantaneous with the spinning magnetic field.
Usage Areas of Synchronous Motor :
- Synchronous motors are typically used in applications that require a specific and constant speed. Positioning machines are a popular use for these low-power motors. They're also used in robot actuators.
- Ball mills, clocks, record players, and turntables all use synchronous motors. They're also used as timing machines and servo motors.
- This motor comes in a variety of sizes, from horseshoe to commercial high performance. These motors can serve two important roles, despite the fact that they are used in commercial high-performance sizes.
Do not hesitate to contact motioncontrolproducts.com for all your AC synchronous motor applications. To know more about ac induction motor for your technical requirements call tel:+00171383950412.
Hello all hope all is good i wanna do a simulink(matlab) experiment for the synchronous motor to find out what is the highest efficiency i can reach If someone can advise me what parameters (for the motor) to use that will help me obtain a high efficiency ?
Title says it all.
Thank you!
One of the mods in r/AskElectronics spiked this post because (I think) it has the word "motor" in it, and asked that I post here. Do linear synchronous motors qualify as motors for the purposes of this sub? I'm thinking of something along the lines of the technology behind railguns, maglevs, roller coaster propulsion systems, etc., although much, much smaller.
I'm getting into building rolling ball sculptures, and was thinking of utilizing some sort of linear synchronous motor to help move the ball along the track. An example:
https://www.youtube.com/watch?v=xobivicdeIU
This infinity track uses a simple lift mechanism to keep the ball rolling. I was thinking with an infinity loop and some sort of magnetic accelerating mechanism, if you mounted the track on a wooden base, you could hide the accelerator underneath the base, and whenever the ball rolled through the low point on the track, it'd get a little kick in the pants and roll around the track again. If you could vary the power of the magnets and the speed with which they cycle, you could control how much kick the ball gets. Not looking for any sort of a railgun - just a little boost.
Anyone have any thoughts on something like this?
Thanx!
I have a BBQ rotisserie motor that I am hoping to use to turn my lathe at very low RPM. The motor turns counter clockwise which unscrews the threaded rod I'm using to connect the motor to the headstock rather than turning the headstock. Top deal with this, I'm hoping I can rewire the motor to turn in the opposite direction, but this is well outside my expertise.
I will post photos of the unit and the motor and hopefully you guys can point me in the right direction.
What are the terminal characteristics of the synchronous motor?
I couldn't find any articles/notes based on this. I need it for my presentation
Thanks
I have this 1 rpm 3-4W 230V Synchronous Motor that I would like to use for a self-designed clock. The problem is that it gets fairly hot (unpleasant to touch) after a few minutes. I bought it somewhere such that I don't know for sure if its new, but its shiny and looks the part. Is it normal for this to get so warm though ?
Because I want to use it in a clock, I'm not that comfortable using it if it gets so warm. Additionally, I intend to use it with 3D printed gears and things, which have low melting temperatures and even lower glass transition temperatures (60C-ish).
Not an EE but I was wondering if I could reduce the power usage (and thus heat).. It seems like a resistive load to me and so the addition of a resistor should work ? Since this isn't my typical low voltage DC application I dislike trying and seeing what happens.. Alternatively, I thought perhaps reducing the voltage with a transformer could help ?
I do expect the torque to be reduced and that should be fine.
A showground that I help out at often has problems with their power supply. The local grid can't carry their load, so they operate their own generator. It is a diesel unit rated for 185kw of 3 phase 240v, distributed throughout their grounds. But over the course of the day the system becomes significantly imbalanced as people move around and consumption moves with them- at times there will be less than 200v on one phase while the others are above nominal.
The electricians working there have tried balancing the phases manually, changing who is fed from what leg to distribute the load better. They can get it to balance for a little while, and then the crowd moves- usually from the grandstand out to the campground, imbalancing the system all over again.
Is there a way to automatically balance the system better? I had been reading up on Synchronous Condensers as used for power factor correction and voltage/frequency stabilization, and it got me thinking that perhaps the same concept of a synchronous motor with a flywheel could be used to couple energy from an under-utilized phase to an over-utilized one to help stabilize the system automatically.
Am I on the right track with this concept? Or would I not be able to utilize a synchronous motor and flywheel in this way because it would not produce the necessary waveforms.
I am comparing async induction motors with synRM and PM motors and noticed that, although the efficiency of a SynRM motor is a bit higher compared to induction, the current is much higher. Example: 110kW 4pole @100% load. IE5 synRM: eff: 96,8% - 243 amp IE4 async induction: eff: 96,3% - 194 amp IE5 PM motor: eff: 97,2% - 191 amp This difference in current is Around 20% which is a lot. Now the only way I can explain the much higher current of the SynRM is that the VFD would sent out a much lower voltage level @ full speed but: A) is this correct? B) would this mean thicker cables between the drive and motor compared to induction and PM? C) in the end the energy company charges us the kWh we use. As we need more current for the synRM would it not mean a higher energy bill and CO2 footprint? Any other advantages/disadvantages of synRM compared to the the other types of motors?
