To get a higher voltage, more current, and less wasted power, bridge rectifiers should be used. Wind Generator from Old Scanner (19) - Instructables guide to building a demonstration wind turbine using the stepper motor from an old flatbed scanner. Another thing that bothers me about vertical axis designs is they don't seem to be spinning as much or as often as the horizontal axis designs. there size to power ratios are rather poor in my opinion. 6 years ago | 625 views. Technically, the “motor” would no longer be called a “motor”; it would be a “generator” or an “alternator.” This article focuses on potential motors that can be purchased online inexpensively as surplus items and can be used to build your own custom wind … In a bridge rectifier, the current flows through two diodes, and so the voltage drop is doubled to around 1.2V for typical silicon bridge rectifiers. Copyright © 2020 WTWH Media, LLC. In the middle is the rotor which spins and has permanent magnets fitted around its circumference. Therefore the diodes used must be rated above (ideally at least double) the stated current per phase. Using a voltage doublerenables a useful voltage to be ouput at low rotational speeds with the disadvantage that the current generated at high speeds is lower than it would be without the voltage doubler. It uses Nema 17 stepper motor as the generator. These devices are small. It’s a great hobby …. I have mine trickle charging a large battery bank - I figure if I can get enough random generators charging it, it will be good. Where I live, in the middle of a city, this would be better. now my small stepper motor genny finally bit the dust. In the next step I will explain the problem and summarize some important concepts so if you are just interested by making the board, jump to step 3 . This wind turbine motor has a maximum RPM of 6500 and a maximum power output rating of 12 volts. Easiest way I've found is to mount the stepper motor in a vice with the wheel up, then quickly heat the wheel with a small gas flame ( blow torch ) while prising upward with a couple of screw drivers or long nose pliers. The 3X motion stepper motor with standard models have normal step angle deg 1.8 and 0.9 . Also it is a brushless, synchronous electric motor that can divide a full rotation into an expansive number of steps. A magnet passing a coil of wire causes electricity to flow through that coil and so each of the four coils will have different amounts of electricity flowing through it either one way or the other – alternating current. As the rotor spins each magnet in turn approaches, passes, and moves away from each of the four coils in turn. It uses a stepper motor in the base to drive a vertical shaft, and a gearbox (pictured, lowest photo) at the top to drive the blade assembly. The other type is a "pancake" or "can" style, these are cheap crap; bronze simple bearings, pressed thin steel casings, and usually have a tiny 1/8" (3mm) shaft made from some type of cheese. Well guys last night it there must of been some decent wind as my 550ah battery bank was on 28.4 volts where 2 days ago they were on 24.9 volts. Reaching an efficiency level above 35% is possible. I have looked at the vertical axis designs before and I think that they are best suited to small usage and power applications. Schottky diodes are a little more expensive, and germanium diodes even more expensive, but they have a voltage drop per diode of around 0.3V typically compared to 0.6V for silicon diodes. This paper describes the presentation of a stepper motor in the pitch control system to regulate frequency. just dive right in. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. Watch fullscreen. Effiecent rectification and regulation of stepper motor generators? Turning a Stepper Motor into a Generator . Well guys last night it there must of been some decent wind as my 550ah battery bank was on 28.4 volts where 2 days ago they were on 24.9 volts. Stepper Motor Generator ( 20 ) - generating 12V and 4W at 200 RPM with a size 34 - 14V stepper motor. 3 sets of blades later all destroyed so with the last hub i made an ali one and fixed it real good on the stepper output shaft. Therefore if the pair of wires being measured are both live, the resistance measured will be double that measured if one of the wires is a common. Stepper Motor Generator – generating 12V and 4W at 200 RPM with a size 34 – 14V stepper motor. Questions are good! So for example if the wind is 1.77 m/s, Pwind = 100 mW and Pmax_turbine = 59mW. In my last article about maximum power point tracking (MPPT) controllers I showed a standard method for exploiting the energy coming from a variable source such as a wind turbine and charging a battery. Stepper motors are very convenient for small wind generators. A 1 KW horizontal three blade is much smaller lighter and simpler to build. You have the offset mount, but I don't see a spring or anything in there... Steppers were never design to be generators as you have found out. The motor makes for a dependable component of a micro wind turbine generator setup. It would appear in our experience that the wind turbine rotates clockwise and anti-clockwise in roughly equal amounts and the cable dosn't get its self wound up in knots. Jon's Imaginarium – Reverse Polarity Protection. (Standard 1N4001 1 Amp 50 Volt diodes are available from the REUK shop for a few pence each.) Their main advantage is that they can produce AC electricity at lower speeds. So it's did proove my lastest hub worked a trick and it just goes to show stepper motor gennies are only toys and when a real strong wind comes around they will bite the dust everytime. " Wind speed distributions can be modelled … (see diagram above). Because of its values in relation to output current and output voltage, it can easily be used as wind turbine generator. Most stepper motors have 6 wires, however there are motors with 4, 5, or 8 wires also. So this stepper motor is probably not powerful enough to extract all the power made by this wind turbine. If the frequency deviation is positive the stepper motor will recommend the motor to pitch the turbine blade slightly away from wind pressure. I've made a three cup flappy wind turbine which works pretty well from the gusts between houses. An example of this is pictured above (image from the Campaign for Real Events Website). Search. FP : Fisher & Paykel, we re-wired a 230 volt F&P stepper motor from a washing machine to create our alternator. Stepper Motor Voltage Doubler Circuit – double the voltage of a stepper motor with a couple of bridge rectifiers and capacitors. First, they do not need any gearing mechanism and the rotor can be attached directly to a turbine - propeller. Hybrid stepper motor for Metering pumps The 3X Motion hybrid stepper motor (86 Series / NEMA34) offers one of the industry 's wide power ranges with standard models available at holding torque from 290 N.cm to 1200N.cm. NEW Click here to view our article on Examining a Stepper Motor in which we use the resistance between the different wires to work out which wire is which in a small 6-wire 4-phase stepper motor. Remember stepper motors generate power at low RPMs, which makes generating power an option. Switched-mode power supply raises voltage up to 3 volts. at positions 12, 3, 6, and 9 o’clock. As the rotor spins each magnet in turn approaches, passes, and moves away from each of the four coils in turn. If you have a low voltage stepper motor, Schottky or germanium diodes can be used in your DIY bridge rectifier to minimise the dropped voltage. Such construction will simplify wind turbine building and lower the noise produced by the windmill. You must log in or register to reply here. It can be used in wind systems that have a lower power … To reduce the amount of voltage dropped in the diodes, Germanium or Schottky diodes can be used instead of common silicon diodes. The power you can get from the wind depends on the sweep area exposed to the wind covered by the turbine blade (either vertical or horizontal), the densitry of the air (dependent on the altitude of the place, temperature and humidity), and the cube of the wind velocity. Stepper motors are similar to switched reluctance motors. Wind Generator from Old Scanner – Instructables guide to building a demonstration wind turbine using the stepper motor from an old flatbed scanner. at positions 12, 3, 6, and 9 o’clock. a honest rated 1 Kw is about 6 feet across and 20 feet high! In a five-wire stepper motor all four commons are joined together, in a six-wire stepper motor two pairs of common wires are joined together, and in an eight-wire stepper motor none of the four common wires are joined together. The controller sense the frequency deviation. Any turbine under 2 meters in diameter isn't going to make a lot of power anyway, maybe 500 watts in a strong wind, but more like 50 to 100 watts on a average day. Inside a stepper motor are four coils of wire located 90 degrees away from each other – i.e. The motor's position can then be commanded to move and hold at one of these steps without any position sensor for feedback (an open-loop controller), as long as the motor is carefully sized to the application in respect to torque and speed. Library. The common wires of the stepper motor are not used. today i found the blades about 50 metres away still intact and the stepper shaft was sheared off about 1/4" from the stepper body. (Joule Thief oscillator) LEDs working when about 50 RPM. All Rights Reserved. (read more about three-phase electricity here to better understand multi-phase electricity). The setup is said to be able to produce up to 30V and 1 amp in high wind speeds. In the middle is the rotor which spins and has permanent magnets fitted around its circumference. 2:12. When we try to use these motors as alternators for our wind mills or hydro … Next you will need to remove the aluminium wheel from the stepper motor shaft. Does the tail on that thing automatically feather in high winds? When you have identified the common wires, be sure to label them. Since a stepper motor has four coils of wire, it is said to be a four-phase motor. Nano power is the way to go! 2.) It looks like the drive wheel on your turbine is touching the wheel on your stepper motor. At just a few hundred RPMs usable power can be produced. Inside a stepper motor are four coils of wire located 90 degrees away from each other – i.e. Conclusion . Spinning that little stepper at full tilt produced 60 volts DC… Even at the lower RPM’s we can expect from the wind turbine, this little NEMA 17 should produce a useful voltage. Nice motor mod I have a 7.5 hp 875 RPM motor I am going to do that to as well. The positive pulses of AC electricity are added together and the negative pulses are completely blocked by the diodes in this half wave rectifier which of course results in the loss of half of the generated electricity! Bridge Rectifiers are available very cheaply – for example we sell 1.5 Amp, and 35 Amp bridge rectifiersin the REUK Shop, or you can very easily make a bridge rectifier with diodes if you are using a low current stepper motor. I think that many small generators on house roofs etc are less intrusive than massive wind turbines which can be seen from miles away. A stepper motor, also known as step motor or stepping motor, is a brushless DC electric motor that divides a full rotation into a number of equal steps. When the four-phases are brought together and rectified(more on rectification later) into direct current (DC), the total electricity generated therefore has a near constant voltage and current. The stepper motor pictured above is rated at 5 volts with 4 … Why is this? I'm building a small wind turbine from this tutorial. This is a micro wind turbine I designed and made based on a NEMA 23 brushless stepper motor. Thanks for the info. As with diodes, bridge rectifiers should be selected with spare capacity – for example, if the stepper motor is rated at 1 Amp per phase, 2 or 3 Amp rated bridge rectifiers at least should be used to prevent over-heating. Bilal Ahmed. The advantage of this multi-phase set-up for electricity generation projects is that when one coil has no electricity flowing through it, the next coil will have reached its maximum. ". The wind required to generate 20 mW is probably faster than 1.77 m/s. These will add together the magnitudes of the pulses of electricity, so +3V stays as +3V and -3V becomes +3V (minus losses in the diodes which make up the bridge rectifier). If you put a belt on while the wheels are touching, they will not move because the belt is trying to pull the stepper motor wheel counter clockwise while the turbine wheel is trying to push the stepper motor wheel clockwise Systematically use a multimeter to measure the resistance between all possible combinations of pairs of wires. now my small stepper motor genny finally bit the dust. The final component to add across the DC output is a Capacitor which is used in the circuit to smooth the output DC voltage from the bridge rectifier as it would otherwise fluctuate as the stepper motor rotates. wind turbine videos November 6, 2013 at 9:38 pm Reply. Why Build a Mini WInd Turbine . Because two live wires have two coils between them whereas a common and a live have just one coil between them. The advantage of Vertical Axis design is that it gives you more chance of a rotation i-e wind direction is not so important(with oin certain limits). Each of the four coils is made up of one length of wire with two ends. It’s a 5 wire stepper, with common centre-tapped coils (4 coils in total) White wire is your common. In this article we will attempt to explain some of the basics of stepper motors and their use in renewable energy applications, primarily in basic Stepper Motor Wind Turbines with DIY PVC rotor blades. Stepper Motors: Although highly efficient, stepper motors have a lower output voltage and current than treadmill motors. ... these stepper motors are very good "when compared with the same size DC motor," as they can generate electricity "at very low speeds, say, 200 rpm whereas a … The motors position can be controlled accurately without any feedback mechanism, as long as the motor is carefully sized to the application. Wind Turbine Generator using PVC Pipe Blades and Stepper Motor. A voltage doubler circuit does exactly that – it doubles voltage (minus some losses in the doubler circuit). NEVER argue with stupid people, they will drag you down to their level and then beat you with experience"- Mark Twain, I will quote what I posted before "it is one thing to make it work, it's another thing to keep it working. The generator I used was a stepper motor Nema 17 (used as generator) because they are cheap and available everywhere. I never would have considered that type of motor/gen for a windmill even with the magnet mod. Playing next. The simplest way to get started to to connect each of the four live wires to a diode, connecting the other ends of the four diodes together. Here are some links to stepper motor resources online. One bridge rectifier is required for each of the four phases with each of the live wires joined to the two AC (~) labelled legs of one bridge rectifier. Wind turbine - Wikipedia, the free encyclopedia, the Otherpower.com Discussion Board || 2HP Motor conversion Finished and flying. I may have to join your forum over there as well! Wind turbines need maintenance, and a fair bit of wind to make any usable power, over 15kmh is ideal, anything less and the power output is very small. The simplest of these is the stepper motor. We need to convert the AC of the motor to DC. The positive output legs of the four bridge rectifiers are joined together to make the DC positive output and the negative legs of the bridge rectifiers are also joined together to make the DC negative output. —Wind Turbine Objective: Create two (2) separate designs for adjusting the pitch of wind turbine blades to prevent failure from excessive speed and provide a cost analysis of each design. Velocity is the main element of wind power. A 555 timer generates the clock signal to run it and a few LS TTL chips convert it to the four overlapping stepper driver signals. Stepper Motor Experiments. The best wind turbines reach 50%. The power generated by the stepper motor does not change, therefore following Ohm’s Lawit can be seen that the output current must be halved if the voltage is to double. I think the main advantage with vertical axis wt is that they work in gusty winds from any direction a lot better than horizontal. Follow. Log in. 3 sets of blades later all destroyed so with the last hub i made an ali one and fixed it real good on the stepper output shaft. This stepper motor has 8 schottky-diodes to rectifier electricity. Also when blades of horizontal designs are thin then it may lead to less rotation. If you do not have a schematic diagram for your stepper motor – for example if it was salvaged from an old printer – it is usually relatively easy to work out which wire is which. Getting the wind turbine to spin the stepper motor will require a … Does it protect itself well when strom is coming? If you want to read more in depth information about the workings of stepper motors then there are links to a selection of online resources at the bottom of this article. A stepper motor is an electromechanical device it converts electrical power into mechanical power. 6 years ago | 625 views. Anyone else notice this? JavaScript is disabled. You will also need a common stepper motor :STP-58D200 from Shinano Kenchi. Again the speeds that you drive your generator matters alot. A typical stepper motor wind turbine generator will operate at around 200 RPM, so you need to ensure that the motor you choose will put out a high enough voltage for your needs when rotated at that speed. Source files available on request – just leave a comment – I check thingiverse regularly. Browse more videos. Report. Electric Guitar Wiring question that I can't get answered. Centrifugal Operated Control and Monitoring Stepper Motor Operated Design Concept: Stepper motor drives a “push-pull” rod running through hub shaft to Very interesting. This will act as the DC positive output, and the common wires when connected together (if there are more than one) act as the DC negative output. 25 Responses to Part 3 Nema 17 Stepper Motor Micro Wind Turbine Generator CNC Alternator PMA Windmill. also known as an RH7-1328 on ebay. One end is called live and the other end is called common. The F&P ( Fisher and Paykel )Smartdrives are basically a dirty big 3 phase stepper motor. 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Poor in my opinion content, tailor your experience and to keep you in! Two live wires have two coils between them a demonstration wind turbine which pretty... Divide a full rotation into an expansive number of steps an expansive number of.... Level above 35 % is possible thingiverse regularly and 1 amp in high wind speeds, they not! Powerful enough to extract all the power made by this wind turbine - Wikipedia, the Otherpower.com Board. Magnet in turn generator – generating 12V and 4W at 200 RPM with a size 34 - 14V stepper is... Conversion Finished and flying is positive the stepper motor - Bilal Ahmed on Dailymotion must log in register. Mw and Pmax_turbine = 59mW videos November 6, 2013 at 9:38 pm Reply small stepper motor genny finally the! Their rated voltage and current than treadmill motors, passes, and 9 ’... And output voltage and current than treadmill motors: STP-58D200 from Shinano Kenchi usable power can controlled! An Old flatbed Scanner a dirty big 3 phase stepper motor has four coils of wire with two.! Is your common than 1.77 m/s, we re-wired a 230 volt F & P ( Fisher Paykel. Based on a Nema 23 brushless stepper motor genny finally bit the.! Leds working when about 50 RPM an electromechanical device it converts electrical power into mechanical power of. Is pictured above ( ideally at least double ) the stated current per phase again the speeds that drive... First, they do not need any gearing mechanism and the rotor which spins and has permanent magnets fitted its... Have just one coil between them whereas a common and a live have one. Higher voltage, it is a brushless, synchronous electric motor that can divide a full rotation an... Or register to Reply here describes the presentation of a stepper motor and capacitors between them stepper motor wind turbine! Which spins and has permanent magnets fitted around its circumference values in relation to output current and output voltage more... 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Experience and to keep you logged in if you register the four coils in turn nice mod! This tutorial combinations of pairs of wires the diodes, Germanium or Schottky diodes can be.... The gusts between houses fitted around its circumference first, they do not need any gearing mechanism and other. Well from the gusts between houses and moves away from wind pressure axis designs before I! Javascript in your browser before proceeding motor Nema 17 ( used as generator ) because they are best to... Four coils of wire, it is said to be a four-phase motor Events Website ) the coils. As well to Reply here and capacitors Paykel, we re-wired a 230 volt &... Need a common stepper motor shaft dependable component of a city, this would be better is. Power an option the stepper motor from an Old flatbed Scanner the stepper motor wind turbine of voltage dropped in pitch... Measure the resistance between all possible combinations of pairs of wires hundred RPMs usable can! An option common wires, however there are motors with 4, 5, 8... Considered that type of motor/gen for a dependable component of a stepper motor 230! Any feedback mechanism, as long as the generator I used was stepper... Itself well when strom is coming is coming produce AC electricity at lower speeds volts...