why d.c series motor cannot use for very short distance traction application.?
539535
I'm not sure what a short distance traction application is, but I do know that a series DC motor(virtually) has an unlimited  amount of torque, and will spin out of control unless there is a load on it.  It must be directly coupled to it's load or it will self destruct.
531796
You would need multiple alternators plus an inverter to accomplish this.  A common Delco GM alternator puts out 120A at 13.5-14V DC at an engine RMP above 3000.  You would have to put the DC through an RV inverter (for use camping where you hook up a battery bank and get AC out).  Assuming inverter efficiency of 85%, you would need 7475 (or more if e is less than 85%) DC watts.  You would need 5 alternators to power your inverter.  The problem is the inverter is VERY expensive, as in thousands of dollars.  \n\nThe problem with using a car alternator as an AC source is it is THREE PHASE.  I have had people disable the regulator and get high AC voltage out, but it is three phase.  You would have a difficult time clocking multiple auto alternators so the phases all matched, and then you would only have 3 phase voltage (probably less than 220V but 120V) and it wouldn't be regulated.\n\nFor 6500 watts you need a belt driven gen head.  See northern tool link to belt driven 25KW head.  Also look at their inverters for taking DC and making AC (yeah, I know--americans use 120 but I'm sure you could find a supplier to go to 240)\n\nBut dollar for dollar, you would spend more to fool around with DC alternators than just getting a gen head which was rated at the wattage and voltage with self-regulation.  ALSO you must REGULATE the RPM.  SO just hooking it to a car engine isn't going to work without a governor, which car engines don't have unless you preserve the cruise control option and hook up the speed sensor (which may give weird results at high engine RPM such as 3600 for 60HZ or 3000 RPM for 50Hz).  NOTE: my links are for 120VAC at 60Hz.  Europe will have different specs.
121402
Yes. It is just not possible to generate more electricity than that motor consumes.
218186
AC (alternating current) can be transformed into a DC (direct current) by means of a rectifier or bridge rectifier circuit depending on the AC circuit.\n\nA single AC line to ground or common an be rectified by the use of a single diode. This is a crude dc circuit.\n\nUsing a dual AC line, not grounded, where there are two lines, both above ground, then a full wave bridge rectifier can be used. Four diodes are used which rectify both the positive half as well as the negative half of the AC waveform.\n\nThen there is the 3phase rectifier bridge which uses 6 diodes, converting 3 AC lines, they are 120^deg outof phase of each other. Most industrial machines are using 3 phase power.\n\nMachines using this 3 phase power usually have a Motor Control Center which house a AC Drive (AC to DC to AC) inverter. This drive uses devices called IGBT which are active diode devices providing controlled amounts of power at variable frequency to run a machine.\n\nTo smooth out the DC waveform a capacitor bank is attached to the output of the DC bridge rectifier. \n\nAs you drive by an industrial park you will notice three power lines usually connected to each building. This is the 3 phase power. \n\nLarge Hybrid electric vehicles use such machines.
861581
Cops have them too.  Use helicopters.  Require certain high speed models to come with a kill switch like are used on go-cart tracks.  Disabling it would activate a lo-jac type device or ruin the engine.
796308
It depends on the type of motor. A dc motor may be used as a generator provided it is either a permanent magnet type or has sufficient residual magnetism in the iron to start off the generation.
1023698
You do not.  Get an AC to DC converter then run the motor.
189249
totaly diferent motor
916579
You can't...\nYou may be able to get a 3 HP 12 volt motor at 4000 rpm but the battery would be huge and so would the motor. You could get a 110V 60hz 3hp motor at 4000 rpm.... Any standard electrical motor supply vender can get this for you
1151121
It's possible (but not especially easy) if you have two spark plugs.\n\nOther than that, I don't think it would work.  One lead, check out Onan's web site.  It's www.onan.com/onan/onanengines/ or, just www.onan.com.  But if you find anything, you're luckier than I am.
335160
great question. but u can witness these type in powerplants only. tat to it will be a.c. and not d.c. these have a prime mover of steam turbine. it will be largest ever found and if it d.c. it will have lots of losses and usually they produce a.c. go to the powerplants and visit the generators. u can use the formula n=(120f/p) where n is the rpm and p is the no.of poles and f is the frequency. they may have salient pole type rotor. i don know the dimensions. but the conductors are not cooled by air but with nitrogen..
478746
In the sense of a motor the terminology is from the the early days when wire fibers were used then later found that a brush made of carbon can deliver the power without wearing out the commutator. The carbon brush being of softer material would easily be replaced when worn down.\n\ncheck out the following link:
1056441
hey man I had a banshee that did the same thing. My problem was the stator. also check the cdi box and the plug wire. good luck.
117649
DC series wound motors and generators are the same thing. One you apply mechanical power to and you will get a rippled DC wave form out. The more commutator bars (or magnets) there are the less ripple you get.\nAlternators (generators) are like you find on a car and in the generator sets that power the world. They have rings that go all the way ring the armature instead of the slits in commutators. This means that as the armature spins through the fields of the magnetic an alternating current is induced through the winding and out through the two rings. This is better for the transmission of power over distances rather than DC. So two rings are single phase, three rings are three phase. \nThe difference in a car is that after the AC is produced a set of diodes rectify the current and then a regulator levels it to 13.8volts DC cause batteries dont like AC.
134486
a 383 is a stroked 350....a stroked engine makes alot more torque there for needing to change gears less you can pretty much run the same gear around the whole track
156772
So I don't think I saw an answer that I liked.  Motors move.  And the way motors move is with changing magnetic fields (electric current is changing with respect to time).\n\nWith AC motors, you have a changing current.  So you need to have a coil carrying the current, put it in a circle, and presto, you have a moving north pole moving around in a circle.  All you need is to have a magnet attached to a spindle, and the magnet will move around to follow the moving magnetic field rotating around in a circle.\n\nWith DC current it's different you do not have a changing current, but instead you have a steady current.  So how do you get the magnetic field to change?  You put a special device in that will flip the polarity of the voltage every half turn (or quarter turn depending on what you want).  So what happens is you get current flowing one way, and the magnet on the spindle moves to line up with the magnetic field, then on the spindel you have brushes which make contact with the DC voltage, as the spindle moves, the voltage is cut off, and then is reapplied, but now the voltage is reversed, and the north pole of the magnetic field is on the other side.  So the spindle moves, and the voltage is cut off, and then put back on and again reversed.  The DC motor as it moves reverses the voltage every half or quarter turn (depending on how you want to make it) so the motor creates the time varying magnetic field itself.
371756
Assuming that you are not removing the SCR from the circuit.\nTry to look at the gate signal and the output at the cathode on a double beam 'scope while the servo is trying to operate. Or disconnect the gate and try to turn the SCR on from an external source and see if you get output motion from the servo or whatever the output is.Some caution required with 440 v !!Some recollection from 25 yrs ago may help ? Making a bridge  or H-switch to drive a 1/2 hp dc motor. Collected a pile of dud transistors on bench until able to prevent simultaneous turn-on down one side of the bridge. This is prevented by correct commutation and ensuring that during switching, the instantaneous power dissipation in the device remains outside the specified region.Commutation is aided by placing an air-core inductor in series with the load and then usng a secondary winding on this to make sure that when one side is conducting that the other arms are turned off.It is somewhat tricky and very critical.