Electromechanical

Hi everyone, I am working on a research project about the impact of hailstones. I'm trying to build a device to shoot plastic balls - the "hailstones" - vertically downwards. I would like to be able to vary the energy with which the balls are shot/accelerated. Therefore I want to use a  linear pull solenoid, activate it and place the plastic ball underneath on a membrane (so it doesn't immidiatly fall). Then I'll turn off the magnet, so the inner bolt will be pushed down by the spring, hit the ball and shoot it downwards (see attached sketch). Now I am looking for a suitable solenoid. I hope to find one, where I'll be able to exchange the spring for different measurements, so the plastic balls will hit the ground with different energies. I hope someone can advise me on this. Thanks in advance!  :) Janine P.S. the attachmend doesnt seem to work, does anyone know how to attach a picture?

Hi. It's my first time plan to use linear solenoid. I plan to use for verticle lock application. when energize solenoid pulls in, de-energize spring return home which will extend solenoid fully. Based on RS specs, squared housing have more pull force than tabular. my concern are: 1. is it good to hold current for along time to pull in linear solenoid? (for my application: keep unlock always energize) 2. is it good to use only half stroke of the solenoid? or better design to always pulls fully 3. some of RS linear solenoid does'nt have power (watt) for specific product but got same power-force graph. how to diffrenciate the variance?  thanks dan

I would like to create a power back-up for my gas boiler, so that I can still have heating if the grid goes down. Do I just need an Uninterruptable Power Supply? And if so, for approximately how long will this run a boiler which requires 140W? Thank you. Tim

What Are The Three Poles Of The Mos Tube? How To Determine The Three Poles Of The Mos Tube? The three poles of the mos tube are: G (gate), D (drain) and s (source). The voltage between the gate and the source is required to be greater than a certain value, and the drain and source can be turned on.   1. Judge the gate G The MOS driver mainly plays the role of waveform shaping and strengthening of the drive: if the G signal waveform of the MOS tube is not steep enough, it will cause a lot of power loss during the review switching stage. The side effect is to reduce the circuit conversion efficiency, the MOS tube has a severe fever, and the MOS tube GS is easily damaged by heat. There is a certain capacitance between them. If the G signal drive capacity is not enough, it will severely affect the waveform transition time. Short-circuit the G-S pole, select the R×1 gear of the multimeter, connect the black test lead to the S pole, and the red test lead to the D pole, and the resistance should be a few ohms to more than ten ohms. If it is found that the resistance of a pin and its two pins is infinite, and it is still infinite after exchanging the test leads, it is confirmed that this pin is the G pole, because it is insulated from the other two pins. 2. Judge the source S and drain D Set the multimeter to the R×1k file to measure the resistance between the three pins. Use the exchange meter pen method to measure the resistance twice, and the one with the lower resistance value (generally several thousand ohms to ten thousand ohms) is the forward resistance. At this time, the black test lead is S pole, and the red one is connected to D pole. Because the test conditions are different, the measured RDS(on) value is higher than the typical value given in the manual. 3. Measure the drain-source on-state resistance RDS (on) There is a PN junction between the source and the drain, so according to the difference between the forward and reverse resistance of the PN junction, the S pole and the D pole can be identified. For example, use a 500-type multimeter to measure an IRFPC50 VMOS tube with R×1 file, RDS(on)=3.2W, greater than 0.58W (typical value). Test steps: MOS tube detection is mainly to judge MOS tube leakage, short circuit, open circuit, and amplification.   The steps are as follows: If there is a resistance value that is not tested, the MOS tube has leakage. 1. Remove the resistor connecting the gate and the source, and the red and black pens of the multimeter remain unchanged. If the needle gradually returns to high resistance or infinite after the resistor is removed, the MOS tube will leak. 2. Then a wire connects the gate and source of the MOS tube. If the pointer immediately returns to infinity, the MOS is intact. 3. Connect the red pen to the source S of the MOS, and the black pen to the drain of the MOS tube. A good needle indicator should be infinite. 4. Connect a 100KΩ-200KΩ resistor to the gate and drain, then connect the red pen to the source S of the MOS, and the black pen to the drain of the MOS tube. At this time, the value indicated by the needle is normal. If it is 0, the next charge charges the gate of the MOS tube through this resistor, generating a gate electric field, because the electric field causes the conductive channel to conduct the drain and the source, so the pointer of the multimeter deflects and the angle of deflection is large. The better the discharge performance.   Application field of MOS tube (field effect tube) 1. Industrial field, stepper motor drive, electric drill tool, industrial switching power supply 2. New energy field, photovoltaic inverter, charging pile, drone 3. Transportation field, car inverter, car HID ballast, electric bicycle 4. Green lighting field, CCFL energy-saving lamps, LED lighting power supplies, metal halide lamp ballasts MOS tube step-down circuit   In the figure, Q27 is an N-channel MOS transistor. When pin 1 of U22A outputs high level, Q27 turns on, stepping down the VCC-DDR memory voltage to get 1.2V-HT bus power supply, and when pin 1 of U22A outputs low level, Q27 turns off , 1.2V_HT bus voltage is 0V.   components expert www.componentsexpert.com

Hi, I am trying to draw electrical machines, especially PM machines. The magnets are usually red, while the stator windings are yellow, green and brown. I created an arced magnet in 2D, but I cannot change its color. Can anyone help please? Kind regards, robert

Is there any content on DesignSpark about sizing the cooling requirements for a panel that will be shipping to the middle east?

I have a portions control valve that is commanded by a 12+ and a 12- signal but it need 24v for and enable signal . I have another wire available to use as ov reference. Can I use to diodes to +12 and -12 in a full wave rec. configuration to get in able signal?

Hi, I wonder if anyone could help me with what motor I should get for a project. In my project, I want to create a battery-powered motorized ‘lazy susan’, where the top part of wood will spin with an object on top. I am quite confident on how I will attach all the components to do this as there are many youtube tutorials on the internet that show a similar thing – here is a link to one that might give you a better idea of what I am talking about: https://www.youtube.com/watch?v=sPTWccIgEQo) But what I am unsure of is what type of motor to get, so my question is: What type of motor and battery voltage do I need to support the load of around 1.2kg of weight (the combined weight of the top piece of wood that will spin and the object on top of that) and still spin the load quite fast (up to 120rpm)? I understand that the speed of the motor reduces with more load but I am unsure of how to work out what type of motor and battery I will need for my requirements. I will also be attaching a reducer to my circuit so that I can control the speed of the motor. The lazy susan has to be battery powered as I intend to film it outside. Any help would be really appreciated! Helen

RS PRO 3 Phase AC motor, 11kW, 4pole,B3 Foot mounted Full load torque = 71.6 Datasheet does not display starting torque?

I work for a charity which sends donated school science apparatus to schools in developing countries.  We carry out basic repair work where possible.  I am looking for a transformer to convert between 3 and 24 volts.   RS item 504773 has the correct turns ratio and is the correct size but it doesn't work in my application because the coil resistances are too large.  The coil resistances needed (measured as d.c. rather than a.c. impedance) are about 0.7 and 14 ohms.  Is such a transformer still made or was it a special for this apparatus which is no longer made ?

Dear Fellow Engineers, I am now 61 years old and trying to relive my boyhood dreams. I am in the process of converting a 1965 red GPO telephone into a 1966 Batphone complete with cake cover! One area yet to be achieved is the ringtone, please see link: https://www.youtube.com/watch?v=4uCr4MD7dTk  for the phone ringing sound. The current bell ringing system is I beleive runs from a 75V ac supply.  I am having difficulty finding a buzzer that sounds very like the Batphone.  One problem is the inability to hear the buzzer before purchase from the Internet.  Do you know if such a buzzer exists? I also have the exact ringtone on my mobile phone, so is there a component I can connect to the GPO phone that can be loaded with this ringtone and thus duplicates the Batphone ringtone?  I know that it may be alot of trial and improvement but do not mind a challenge!  Any assistance would be warmly welcomed. David Gibson

Hi, I am an engineer and a hobbiyst and this one I am working on out of curiosity, I am trying to design quadcopter, although haven't started yet but just searching it out and then came to brushless DC Motors, that's a new concept for me. I want to control this electric motor with microcontroller, and I have read difficult circuits online. So, my question is we can't control bruhless motors the way we control normal DC motors i.e. using MOSFET hbirdge etc. Thanks.

Hi, im in need of a variable reluctance stepper motor for a project I have for university. I need a motor that will be needed for accurate positional control but also allow free rotation. I decided on a variable reluctance stepper motor because when unpowered there is no detent torque. I cnat seem to find any motors of the typre however, only hybrid motors with a permanent magnet rortor. Does anyone know of a place where i can purchase a reluctance stepper motor, or an alternative solution to my problem. Many Thanks!

Hello! I am continuing with a concept I developed in for a university course (mostly just to see how far I can take it). It's a secondary EV battery that connects directly to the primary EV battery (kinda like a 'top up' battery). It can be swapped in and out at swap stations. I'd like to begin thinking deeper about the securing/attaching mechanism to the underside of the EV. Any thoughts on how best to approach this are really welcomed! Hopefully the screenshot attached can help demonstrate what I mean. There is also a website with a couple of videos which hopefully display the concept: https://4sbconcept.cargo.site/ Thanks for any thoughts / help! I'm at a bit of a sticking point!

I'm looking for a relay that is a single pole double throw DC micro current relay(5v rated voltage) that can control the on and off the circuit through the current. Please help me find the right relay.