Electromechanical

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.  

I'm trying to buy some transceiver for my home switch setup but I've had some issues with some stores in the past. I found Linxit and FS, but it'd be great if I could get some other options.

I am building an e-spinner (spinning wheel) using a 775 12v DC motor with a speed regulator, it  seems under powered with a 2.7 adaptor what is the optimum 240v - 12/24v adaptor  

I have a 250 watt 240 volt infra-red heat lamp keeping newly hatched chickens warm. I need a battery powered alarm to warn of both lamp and mains failure. I want to use a 240 volt ac relay in series with the lamp such that if either the lamp filament fails or the mains supply fails an alarm sounds. There is also a dimmer in the circuit. Could anyone suggest a relay suitable and possibly the value of a resistor in parallel with the relay coil to make this work? Any better suggestions most welcome.