what is the diference between step motor & servo motor?
115349
By definition a servo system includes feedback a Stepper motor however simply recieves a signal from a conroler and attampts to move to the proper postion. There is no feed back to determine weather this happened or not.
150653
http://www.cs.uiowa.edu/~jones/step/circuits.html\n\nyou might consider buying the chips that do most of the hard part unless you are trying to learn how they work in which case that link is just perfect.
495700
An example of a closed loop control is where something has to go to a certain position. The motor is turned on and it runs until a position sensor tells the controller that it has reached the required position. These are used in elevators. \nAn open loop control to do the same thing would not have the position sensor. It would run the motor long enough that it should have reach the required position. These are used typically with stepper motors where the controller says move n step and that should get it there. Typical use is for the print head in an ink jet printer.
259973
This weblink will explain the differance between the 2\nhttp://www.erg.abdn.ac.uk/users/gorry/eg2069/async.html
653087
Here is a very good article that explains the differences:\n\nhttp://experts.about.com/q/Rave-House-Techno-2974/Techno-Trance-Dance.htm
1014182
Designing one is relatively cheap. Building a prototype is not so cheap. You would need to use precision linear stepper motors or other actuators and their power supplies and  cooling systems and so forth.\n\nI suppose that if you already have a lathe or milling machine you could possibly modify it by replacing the manual positioning and stock feed or tool advance controls with the above computer-controlled steppers, etc. I don't think it would do as good a job as a commercial unit. You would have to have a separate controller for each axis or each degree of freedom that the machine can work in. \n\nHave you tried looking for a used cnc machine that someone might be replacing with a newer unit? It is rare that they would just junk them; you might be able to find a used one or a model that is no longer in production. Try contacting manufactureres. Those are my best ideas, Hope they help.
306929
The Output Speed is generally the main difference. To increase the torque (strength)of the drill, the motor is geared down. The motor in the high speed drill and the high-torque drill may be turning at the same speed but the chucks or bit-holders will be very different.\nMost drills come with two speeds. If the speed is controlled by a gear assembly, then the torque is much higher at the lower speed.
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A CAM changes the input motion, which is usually rotary motion (a rotating motion), to a reciprocating motion of the follower. They are found in many machines and toys. \nA CAM has two parts, the FOLLOWER and the CAM PROFILE. \nThere are different types of follower but they all slide or roll on the edge of the cam.\nONE CYCLE One rotation/revolution of the cam.     \nDWELL When the cam rotates but the follower does not rise or fall.    \nTHE RISE That part of the cam that causes the follower to rise.\n(A cam and follower system is system/mechanism that uses a cam and follower to create a specific motion.  The cam is in most cases merely a flat piece of metal that has had an unusual shape or profile machined onto it.  This cam is attached to a shaft which enable it to be turned by applying a turning action to the shaft.  As the cam rotates it is the profile or shape of the cam that causes the follower to move in a particular way.  The movement of the follower is then transmitted to another mechanism or another part of the mechanism. )\n\nAs some external turning force is applied to the shaft  (for example: by   motor or by hand) the cam rotates with it. The follower is free to move in the Y plane but is unable to move in the other two so as the lobe of the cam passes the edge of the follower it causes the follower to move up.  Then some enternal downward force (usually a spring and gravity)pushes the follower down making it keep contact with the cam.  This external force is needed to keep the follower in contact with the cam profile.\nFor more pl. click the link bellow:\nhttp://www.ul.ie/~kirwanp/constructionlinks.htm\nhttp://www.ul.ie/~kirwanp/constructionofradialplatecamfive.htm\nhttp://www.ul.ie/~kirwanp/constructionofradialplatecameight.htm
275517
- A DC brushless electromotor is mainly a step-motor with a rotor made out of permanent magnet, and a stator made out of coils (mostly 4 coils, but it depends on the type of step-motor). As this is a step-motor, it needs some kind of regulator, which is made on a little electronic board. So... a DC brushless motor is made out of 3 things: \n\n1 Electronic Circuit Board \n2 Coils \n3 Permanent Magnet \n\n- Electronic Circuit Board and Coils: \n\n- This part is doing the trick - rotating the permanent magnet. There are in most every case only 4 coils in a normal fan, grouped as 2+2. The first group (let's call them the North-South group) is connected to one electrical circuit on the electronic board. And the second - East-West - is connected to the other electrical circuit. \n\n- On the electronic circuit board is located one small device that is most responsible for this trick. It is called Hall-probe (or Hall-sonde), and its location is just under the permanent magnet. \n\n- It's used to detect the south pole of the permanent magnet. The Hall-probe regulates two different electric circuits driven by two transistors, and depending on the pole it detects, it drives the proper circuit. With this type of regulation, it is possible to create a rotating magnetic field, and rotate the permanent maget located around the coils. \n\n- A permanent magnet has two-poles - North and South. Let's look what happens when the fan is powered. \n\n- Depending on the location of the south pole, Hall-probe drives one of the circuits. So, let's say that Hall-probe is sensing the south pole. It drives one of the circuits (let's say north-south circuit). \n\n- When the north and south coils are powered, they produce the magnetic field. This field is of the same direction in both coils, but... :) the Magnet hasn't got the same direction of the magnetic field in both poles. It looks like one coil is pushing the north pole away, and on the other hand, the second coil is pulling the south pole to itself. \n\n- Now, when the magnet is moved, the south pole goes away from the Hall-probe, and as it isn't sensing it anymore, it drives the second transistor (second circuit). With that, east-west coils are turning on, doing the same job as north-south coils did before. \n\n- So, basically the trick was to produce the rotating magnetic field. And it was done very cleverly! :) As coils aren't made as a moving part, it is obvious that there are no brushes, so that's the part where the name came from - 'DC brushless'. \n\n- Permanent Magnet: \n\n- This is the mostly known part of the electromotor. I think that I don't need to explain much about it. It has two poles - north and south, and using the external magnetic field it is possible to move the magnet around. In a fan, the magnet is circuit-shaped and it rotatrd around its axis. \n-------------
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The induction motor sets up a rotating magnetic field due to the phase lag batween the phases. This magnetic field "chases"  the rotor and tries to get it to rotate at the same speed. Ideally, if the motor is \n1. not loaded, and there are no losses due to \n2. friction, \n3. eddy currents, \n4. induction and \n5. resistance losses, \nthe rotor *will* catch up with the magnetic field and would rotate at the synchronous speed. \n\nHowever the world we live in is not ideal. All the losses mentioned above gets the rotor to always fall slightly behind the speed of the magnetic field. The difference is called Slip.\n\nNow if you load the motor, the rotor falls more behind the synchronous speed, kind of like the load is slowing it down. Larger the load, larger the slip. \n\nAnother way to look at this: If you study the speed torque characteristics of an induction motor, the torque at synchronous speed is 0. So if a rotor manages to catch up with synchronous speed, there is no more torque acting on the rotor, so it slows down again ever so slightly (due to various losses). as soon as it slows down the torque kicks in again and pushes it towards sync speed. the end result is that the rotor always is "almost at" sync speed. most motor designs have max torque at about 90% sync speed.
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To the computer hardware, 1's complement is a one-step action.  Adding each bit would be many steps.\n\n1's complement works just as well and is much faster.
817895
Hand-held VSR drills use a geared motor to vary the speed. A drill press with a belt system uses a single speed AC motor and a system of different sized pulleys to vary the speed. If you want to vary the speed without moving the belt, you'll have to do it electronically.\n\nThere are speed controllers for AC motors on the market. Here's a link to a footswitch type.
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Many different types are there. Involving electronic swithes or mechanical. Here is the description of a mechanical type:\n\n1. Take a flashlight that produces very bright light.\n2. Take a table/floor fan.\n3. Place the flashlight towards the fan's blades from behind the fan.\n4. Turn the fan ON.\n\nYou have strobe light. You can change the speed of the blinks by changing the speed of the fan.
825450
A screw is one of the six simple machines. A simple screw is a helical inclined plane. A screw can convert a rotational force (torque) to a linear force and vice versa. The ratio of threading determines the mechanical advantage of the machine.
969269
Whether or not a motor needs a capacitor depends on the type of motor. There are at least 5 or 6 different types of single phase motor, some requiring capacitors, some not (pf correction aside).\n\nIt is likely that the device wired to the motor in the dishwasher is required where ever you use it. It is also usual for start capacitors to be mounted on the side of the motor but may not always be the case. A capacitor is normally cylindrical and will have a value in micro farad.\n\nTake a look at the link below and see if any of the options on it resemble what you have.\nhttp://www.tcf.com/TCFBlower/pdfs/engr_data/ED1100.pdf\n\nThey don't mention another type that is often used in domestic appliances but is clear to identify by the fact it has brushes and commutator, this type would not normally need any separate control\n\nI have even found a dc motor in a standard washing machine, obviously a dc motor requires some other circuitry to use on the mains. I don't know how common this would be to find since I don't take apart too many domestic appliances.
674000
mechanical or electronic?
938555
Different makes, and even different models from the same manufacturer, do differ.  I know this, as I have written the software for one model.  In fact, the algorithms used are a commercial secret, guarded carefully between manufacturers.  This is also the reason I am unable to provide more data, or references.\n\nYou may be able to find them for yourself, though.  Good luck.