Q:What is the neutral point of an alternating current motor? How to determine whether the neutral point leads to?

The AC motor only meets the three-phase fire line, the three-phase is balanced, the neutral point does not connect the zero line, also does not have the ground.

Q:I have this saw and the speed control board has gone bad,so i am going to try and use a variable ac or dc power supply to run the saw,but i am not sure which one the motor uses. I have already hooked the motor to a battery charger,it ran find but does not have enough torque for the blade to cut wood.

its not ac saw, a contractor will not use a dc motor,that is why its running slow.also check the nameplate on it it should say 120 volts ac rpm and amps.60 hertz.

Q:Hi,I planning to buy a aquarium filter form ebay which works on 120vac 60hz . i stay in India where voltage is 220vac 50hz .this filter is having a permanent magnet rotor. please help me can this motor work if i use a voltage converter (220v to 120v ) .Is frequency mismatch does not matter please help

It will still run on 50 hz power. It will just run at a slightly slower speed. Not slow enough to make much difference.

Q:I am making a cotton candy machine and I need to be able to slow down the motor a little bit. Its 115 volts and 3000 rpms. I was told that I might need a special kind but Im almost positive I could use a regular house light dimmer. Which kind should I use?

There are several kinds of 115 VAC motors out there. The universal motor found in many home appliances will run slower if dimmed, but in reducing RPMs you also reduce power because you are basically choking off the motor's source of energy. Because the motor is running near its stall point it will have very little torque available (but since you're using it to make cotton candy, you shouldn't have any trouble there). Any light dimmer will work for this, but if you can find a cheap variac of the same current rating as your motor, you'll get better results. The majority of single-phase AC motors run at a speed that is determined by the windings and the AC line frequency, though, so a true AC motor will not run slower if you use a dimmer; it will only get hotter and produce less usable torque. The only way to slow down a motor of this type is to use a variable frequency drive (VFD) or inverter, which can actually change the frequency of the power supplied to the motor. But here you have to be careful, because unlike a three-phase motor, a single-phase motor cannot start at just any speed. If you get an inexpensive (under $200) drive with a keypad programming interface, you can set it up to start the motor at full speed and then slow to a preset RPM. Again, these motors are designed for a specific speed so you will lose efficiency when slowing them down, but your application doesn't need a lot of torque. eBay is a good source of cheap VFDs, but check to make sure that you select one compatible with single-phase output (and that your motor is also compatible).

Q:What is the stator voltage and current of an AC motor? And what is the current and voltage of the rotor?

The brand name is the stator parameter, the rotor voltage is very low, but the current is very large, about several times of the stator current.

Q:why choke or du/dt filter is used with vvvf drive of ac. motors?

A okorder

Q:i would like to get one that can be the same model number and everything: this is the one that came off my AC - A.O.

go to a real supply house with your old motor and fan and start cap and don't leave without the new start cap its needed and cheap.

Q:what are the two types of motors that are for a single phase multi-speed applications?

1--- A shaded-pole motor is a type of AC single-phase induction motor and needs a triac speed control to give multi speeds 2----A synchronous electric motor is an AC motor distinguished by a rotor spinning with coils passing magnets at the same rate as the alternating current and resulting magnetic field which drives it.

Q:Or how do I find out? I've been trying my hand at some simple woodworking and I like it. I want a small lathe but don't really want to spend the money on one. I have an old vacuum cleaner that hasn't been used in a long time and I ripped the motor out of it. I'm planning on using this along with maybe some old bicycle wheels or maybe some roller skate bearings to make a small little lathe but I don't know if it turns enough rpms.

Most AC electric motor are designed to turn at 1760 RPM on 60 cycle. Washing machine motors are usually 2 speed of 1760 and 1140 for 60 Hz systems. 50Hz run a little slower. Other common speeds are 3520. I would go ahead and build your lathe and use it as a learning experiment. The turning speed for a lathe is slower than the 1760 common speeds so small drive pulley on the motor and 4 times larger should slow the lathe head to around 400 RPM.

Q:that' my question

dc.