Siemens EX Series Motor

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Siemens EX Series Motor

Q: we are having slipring induction motor for crane application using rotor resistances for their torque. suppose i use drives for these motors what should i have to do for rotor resistances. please give me a proper solution: This is common on crane upgrades to short out the rotor and use a drive. There are specific drives for cranes but I have never seen a specific drive for a wound rotor motor. The standard crane drive is used. You may have a concern about the motors if they have not been rewound recently since voltage spike from the drive may damage insulation of anything lower than class F. Most re-winders use class H.

Q: How large AC contactor and thermal relay should be used for the motor of 3KW? There are steps to calculate better.: 3KW motor rated current is about 6A. The bigger contactor can prolong the service life of CJX20-1210 (12A) 8-10A air thermal relay's role is to protect the motor so do not benefit too much 7-8A can protect the motor when a fault occurs.

Q: What I want is to generate electricity out from a 2Kw generator alternator and driven by a 800watts AC motor or any AC motor which is much smaller in electricity consumption. I am not thinking of a perpetual machine but to minimize my electric consumption. The AC motor will be connected to the power grid to drive the 2Kw generator alternator.. is this possible? Thanks ahead.: You can operate a 2kW generator with an 800W motor, but your total output will be exactly 800W. However, about 10% of that 800W output will be heat, so the useable, electrical output will be about 720W. Often people will spin the shaft of a generator by hand and think that, since it takes relatively little torque to make the shaft turn, that a smaller motor could spin the generator at its rated speed. Since the generator's electrical power rating is higher than the motors, it will then put out more energy than is required to power the motor. The small motor can indeed spin the generator to its rated rpm. But, when an electrical load is connected to the generator, equivalent to the generator's rating, the torque suddenly increases and will drag the motor to a stop, or to a much slower speed, reducing the generator's electrical power output below that which the motor draws.

Q: Its a squirrel cage motor from a microwave fan. It has five wires; white, yellow, orange, red, and blue. Inside, it has 16 electromagnets on the stator. How is this motor used?: This may be a multi speed (3) motor and they are using one speed of it. The mfg uses one motor in many different appliances. Does this uW have an exhaust fan which runs on differet speeds? The colors mean nothing in general. I assume that Yel Org are common and Red, Yel, Blu are (3) speeds. Powering it up one way is CW and the other way is CCW. Examining the cage will tell you which way to turn it.

Q: I've seen in an AC motor they have the wires in a sorta quot;trianglyquot; formation for the 3 phase movement, but i was wondering for the sake of a generator which would be better, 3 magnets rotating over the quot;trianglyquot; shape, or 3 rotating over just a regular quot;pancakequot; flat coil, tankya's for da helpz: There is a very good reason that electric machines tend to be cylindrical in shape. The shorter that you can make the air gap in the magnetic circuit the more efficient the machine will be. Yes there is a magnetic circuit and the more of it that is in iron the better it will be.

Q: A sinlge phase AC motor is needed to lift up vertically a load of 150kg to 200kg using chain and gear. Please help.: Depends on how fast you want to lift it. With the right gears a tiny motor will do the job, although it may take hours.

Q: I have a Comfort Maker Heating Air Conditioning system/furnace and I noticed that I am not getting air through the vents. The dampers are in the open position. I switched (at the thermostat) to AC/fan on quot;AUTOquot; for 20 minutes, and I noticed that the squirrel cage and the heat inducer/motor was running while it was set on AC. Is that supposed to happen. I also ran it on heat and same result w/absolute NO heat/flame coming out of the manifold.Also, the whole time the system was running, the outside air handler unit never commenced.: The inducer will run if there is a call for heat or your high limit on your furnace is open. You have the a/c running which tells me your unit may be leaking water onto your control board or you have a short in some wiring somewhere. I suggest you call a HVAC company to diagnose.

Q: ( Just the basics? )Why does the armature spin continuously in both?I really do not understand , why does the current alternate in an AC generator anyways?how do the slip rings work?: The principle of operation of a dc motor is that current through a coil of wire forms an electromagnet. Lets assume the electromagnet is formed in the rotating part of the motor (rotor). that gets its power through the split rings and carbon brushes. The fixed portion of the motor(stator) is a powerful magnet. The north pole of the electromagnet will be attracted to the south pole of the fixed magnet and cause the rotor to turn. As the magnets get near alignment the split rings(commutator) remove power from that coil, and apply power to another coil that is physical wound at an angle such its north pole will continue the rotation. the rotor will contain many coils each with a pair of contacts in the commutator.

Q: HELLO, I WANT TO CONVERT ABOVE CONFIGURE MOTOR 1440 RPM TO 120 RPM ONLY BY ELECTRICAL OR ELECTRONICS SOLUTION. PLEASE ANY ONE PROVIDE ME SOLUTION AND CIRCUIT DIAGRAM FOR THAT. I DONT WANT VARIABLE SPEED CONTROLLER. I JUST MAKE ONLY ONE CONTROL OF SPEED AT TIME. SO PLEASE GIVE ME LOGIC AND CIRCUIT LOGIC ALSO.: That is not going to work. It sounds like an induction motor. The speed is controlled by the frequency of the supply. To get a speed less than 1/10 of normal, you would need to generate a frequency less than 5 Hz. If you did that, the efficiency of the motor would be horrible. Even if you managed with that, you would still have problems. Most A.C. single phase motors rated at more than a few tens of watts use a 'centrifugal switch' to disconnect the starting windings when the motor is running. It certainly would not operate at that speed. Your motor would cook. Sorry.

Q: The existing capacitor is 35/3/370. Can I get a new one that is 35/5/370?What does the second number (5) stand for anyway?Thanks.: Be on gard not to succumb to this devlish seperation of you from your hard-erned money. Chances are you will be sold a fake capacitor. Unless it is the size of a lb coffee can and is tested for right action before buying, it can-not be trusted to perform what is required. I suspect you are trying a last gasp to fire the compressor,on your ac. If the unit is 10yrs+ old, forget it and shop for anew condensor unit. If you want that handeled quick, expect to pay a grandper 2 tons. or less tons.

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