Q:What kinds of AC motors are divided into?

The AC motor can be divided into squirrel cage AC asynchronous motor and winding AC asynchronous motor according to the rotor difference

Q:What is the reason that the single phase AC motor is turned on and off?

Exclusive use only. Check the switch first, is there any bad contact?. After the problem of the switch is removed, the power is turned on, and whether the cold state can run normally every time. If there is a phenomenon that the cold condition can not work properly, the internal circuit or winding is not working. If the cold running is normal and the use of a period of time does not turn, and then use the hand to touch the motor whether the fever is serious, such as temperature is too high, the heat protector is broken, and so the motor can be turned cold. This phenomenon should check whether the no-load and load resistance of the motor is too large, whether or not the winding has a short turn between the two places, causing the temperature rise too high.The two capacitors on the motor, one is the starting capacitor, the other is the operating capacitor, which produces phase difference. The starting capacitor is only connected to the circuit when the motor is started, and it is disconnected when it is running normally. The operating capacitor is always connected to the circuit.

Q:Can a DC series motor operated on AC supply?

Yes. The universal motors used in such appliances as vacuum cleaners and blenders are essentially the same as series DC motors. Although the current reverses with each cycle, the current direction in the field always matches the current direction in the armature because of the series connection. However, if the motor is designed as a DC motor rather than a universal motor the cores may not be laminated leading to increased heating due to eddy current losses. Other design differences may also prevent the motor from performing as well as it would with DC power.

Q:The difference between synchronous motor and asynchronous motor

The synchronous motor belongs to an alternating current motor, and the stator winding is the same as the asynchronous motor. Its rotor speed is the same as that of the rotating magnetic field generated by the stator winding, so it is called synchronous motor. Because of this, the phase of the synchronous motor is ahead of the voltage in phase, that is, the synchronous motor is a capacitive load. To this end, in many cases, synchronous motors are used to improve the power factor of the power supply system.

Q:how can we define dynamic eccentricity index in ac motor?

In AC electric machines, it is much more important to detect possible dynamic eccentricity of the air gap. It can be detected by the index of slot frequency vibration component modulation by the rotation frequency harmonics.

Q:Well our AC motor broke and we are stuck in this hot house -3- i aas wondering how can i stay cool?

Take a cool bath or go to a local (or your own) swimming pool. Buy some fans and put them around the home. Take a dish rag and soak it in icy water and put it on your head and relax. Dim or completely turn off your lights and any electric devices such as the television computer things you are not using. Do not cook on stoves or use the oven. Drink a lot of cold drinks and take often cool showers. Go to a place with AC like a mall store or library. If you do not have a pool and can not get to one use your hose to cool yourself down. Close your blinds so the sun will not go directly on to you. Stay in a basement or if you do not have one then a garage because heat rises so it will be cooler there. Eat some ice pops or ice cream. Plan to spend the night at a friends or a family members if it is that hot. Walk around in a tank top and shorts even your swimsuit might sound weird but you will be cooler. Don't move around stay in one cooler part of your home and read a magazine or a good book for a while. Hope you cool down! Good luck

Q:Hey guys! I need your help.... I know just one point that DC motor can control speed even with load but AC motor can't. I want more points...... could u help me???? It would be gr8 if u could tell me the name of the site from where i can get some info. about this.......Thankyou in advance!

The main advantage of a DC motor over an AC motor is that it can operate directly from from a battery. The speed of a DC motor can be controlled with a less complicated control unit that the unit required for an AC motor. Only the armature voltage needs to be controlled.

Q:How to calculate AC motor efficiency at no load?

efficiency is zero because the output power is zero. however, there still is input power which is wasted as losses in the motor (mechanical losses, copper losses)

Q:Can we test all the types of motors brushless, AC single phase, 3 phase, DC Motors, Servo motors etc with Megger ?thanks in advance

Only one type cannot.....the low voltage DC brushless motor like the cooling fan in computer. It has low voltage power converter module, Megger high voltage shall kill it. =======================================... Additional email reply to asker How to test motor with ohm-mter...... 3 phase motor -test all six leads between motor body, all show infinitive ohm. Use mega do the same test by setting it into 250v. Reading show 10M ohm or higher. Test resistance between two individual coils with mega, it should read 10M or higher. Use ohm-meter measure resistance of 3 coils, three reading show very close resistance. Compare the resistance from a good motor or from pass trouble shooting experience to determine it is a good motor. If one winding is much less resistance than other two or one winding is much higher than other two. This motor could be defective. If insulation test show under 1M ohm,its insulation is no more good,has electrical leaking. DC series motor: mega test between ground and leads, resistance test on both leads and compare the good motor reading. Rotate the rotor very slowly while doing resistance test,reading shall be change a bit (use analog type meter is better for this test). But resistance should not swing up and down very much. That tell how good is the brushes contact to rotor and what is the condition of several rotor coils. If at one position,resistance goes down into very small (zero) or jumps up very high. rotor needs clean or section of coil defective. Understand the construction of different type shall help you how to test it with simple ohm-meter.

Q:It's a 1kW single phase AC pump motor with a 100v supply. This is for a theory question btw. :)

use a potentiometer.