Q:i wont to make my slide door to open and close with out use my hand and i wont the electronic map to make itthank for all

You need a series motor like the one use for drill. By changing the stator coil direction, AC series motor can change its rotation. A DPDT relay can do this task. Use this motor to rotate a gear to control door either open or close. Limit switch installs on both end to stop the door at fully close and fully open position. A reset control is also require to restart the task.

Q:I know that Watt, RPM Torque are connected each others, but, with the same RPM Watt, are there unordinary electric motors out there that have very higher torque than ordinary motors ( especially 220v 1 phase AC motors ) ?Can someone give me the website address about it ?

Not okorder /

Q:What happens to DC motors when they are connected to AC current?

Most DC machines will not operate successfully on AC unless they are rewired to operate similarly to the AC/DC Universal motors used in hand tools. You probably have already operated a DC motor on AC if you have a drill. Hope this helps, Newton1Law

Q:We want to buy a paper machine from canada, the electrical power used for driving the motors (for pumps, refiners, ...) is 380 vac, 3ph, 60hz; We want to install in country with 380 vac, 3ph, 50hz.

Monophoto has provided a very good answer, but I take exception to one point. When an AC motor is operated at a frequency that is different from the rated frequency, the voltage must be changed in proportion to the frequency change. If that is done (within some limits) the motor can produce rated torque at rated current at the new operating frequency and speed. For a 460 volt 60 Hz motor, 380 volts is the required voltage for operation at 50 Hz. However, the motors will operate at 5/6ths of the rated speed. If pulleys and gears are changed to bring the driven machinery up to the original operating speed, the torque demanded of the motors will be increased. Unless all of the motors were over-sized to begin with, they will not be able to supply sufficient torque without overheating.

Q:Why is a split phase or capacitor start motor typically not a varialbe speed motor?What would have to be done to operate a split phase or capacitor start motor as a variable speed motor?

When you run a current through a wire, it will induce a magnetic field. A motor works on the principle that when you place a magnet N to N or S to S, it will repel. By inducing a magnetic field that constantly 'flips', constant torque is applied to the shaft. On a DC motor, this 'flip' is done using a physical device called a commutator. Basically, it flips the + and - leads on the coil around every half turn, so the N and S poles of the fields are always in the reigon where they repel, causing circular motion. When you increase the current capacity, the motor will experience greater torque and will turn faster, and the commutator will flip the polarity as quickly as needed, so you can control a DC motor by reducing the current capacity of the input, by reducing the voltage or by inserting a variable resistor. On an AC motor like the ones you describe, this 'flip' is part of the waveform itself. You can't reduce the speed of the motor by reducing the current capacity(using a rheostat or resistor) because the torque the motor has at a certain shaft angle is related to the voltage it sees. The way AC motors are made to be variable speed is to change the frequency of the input waveform using something called a Variable Frequency Drive or Variable Speed Drive. It will take an input AC signal, turn it into DC, then use power transistors and computer controls to create a new waveform, whose frequency can be easily controlled.

Q:What's the difference between an AC motor and a direct current motor?

Alternating current dynamo：1. AC motor with frequency device, there is a wrong display window, will automatically detect the fault and display the corresponding code, what problems will be clear2. compared with the DC motor, the output power of the same number of AC motor will be greater than the DC motor3. AC motors do not have carbon brush, so they will not produce DC motor those disadvantages

Q:i plan to put AC drive in crane motors that are currently slip ring motors, since ac drives are made for squirral cage induction motors we can short the rotor terminals and put them? Is there any category of special carne duty ac drives ?

Variable frequency drives VFDs) can be connected to slip ring induction motors with shorted rotor terminals. Because of ringing voltage transients that occur at the waveform switching transition points, VFDs cause voltage stresses on the motor insulation. Motors rated for VFD use are recommended, but older motors can be used. Output reactors or dv/dt filters are recommended for use with older motors. Most VFD suppliers can provide detailed recommendations. Many suppliers have experience with crane retrofits and can provide information and VFD features for coordinating the VFD operation with friction brake controls etc.

Q:I made a three axis CNC router with three CD drives. I was going to make a stepper motor controller board for the CNC but I noticed that the motors are NOT servo motors instead they are hobby motors(the motors with two wires) So is there a schematic anyone knows of that controls a hobby motor with a parallel port? I WILL PICK A BEST ANSWER!!! thank you!

If you want this router to work at all you need micro stepping and cheap easy plans don't offer this. The plans that do end up costing a lot in parts so it's better to just buy a kit. If you have money you can get good controllers from rutex and gecko drives.

Q:I have an AC treadmill motor 115volt 18AMPS and want to use for a Wind generator, There are 3 wires connected to the motor and another grounded to the body of the treadmill. If i connect a rectifier, pls will it work??? THANKS!!

No. The motor does not contain magnets with which to generate current through rotating the shaft. However, if you don't believe that you can always experiment. Put a voltmeter on a a pair of wires and spin the shaft. It always fascinates me that many of you don't just experiment. You just as easily try it instead of asking others to tell you if it will work. You can learn a lot by experimenting, taking things apart, playing with them.

Q:Soybean milk machine AC motor or DC motor is good?

With a special fragrance, and slightly stimulated; slightly sweet, and accompanied by stimulating spicy taste. Flammable gas whose vapors can form explosive mixtures with air and can be miscible with water at any rate.