ABB High Voltage AC Motor

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Q:basic difference between normal and servo motor?
I would say that the definitions given in answer 1 are fine, but the latter applies more to a stepper motor than a servo. A feature of a servo is not that the pulse produces a specific step, but that the width of the pulse produces a definite displacement - in other words if pulse is 60 milliseconds wide it might produce a quarter turn and if 120 ms, a half turn. This is done with a potentiometer in the device which measures the turn. Servos come in partial turn and continuous and in the later the width controls the rotational speed and direction.
Q:How do you power this AC motor?
This looks like it might be a stove-hood fan motor for the type of microwave that is combined with a stove hood. If that is true, there are probably three speeds. Small fan motors are often shaded-pole motors. A shaded pole motor has only enough starting torque to start the fan it is designed for - not much torque. It could also be a permanent-split-capacitor (PSC) motor. That design has a little more starting torque, but still not MORE THAN would be needed for something like a fan or centrifugal pump. If it is that type and you don't have the capacitor, you would have virtually zero starting torque and the motor would run in whichever you give it a push to get is started. [corrected my error later] When you salvage a motor from an appliance, it is always good to look carefully to see how the wires are connected and salvage the switch and any capacitors or other external items connected to the motor. The speed is changed in this type of motor by connecting at several points on the winding to use only part or all of the stator winding. That is equivalent to running the motor on lower voltages. Operating on lower voltages weakens the motor so that the load slows the motor down. It takes less torque to run a fan at a slower speed, so the motor slows down until it find the speed at which the torque that the motor can produce matches the torque required to operate the fan.
Q:Why is Tesla's Model s electric vehicle using AC motor instead of the more popular frequency conversion DC motor?
1, the DC motor structure is complex, the cost is relatively high, late maintenance trouble.2, larger motors are required to be connected to large cooling fans.3, it can realize the speed regulation simply and economically. Big torque and good mechanical characteristics.4, AC motor structure is simple, low cost, simple maintenance. You can't speed it yourself. In the past, the frequency conversion was not timely, and the DC motor was used in places requiring good speed control (machine tools, cranes, textiles, etc.).
Q:Motor with variable speed control?
I'm sure the type of motor used in that item on eBay is a synchronous one, so a speed control won't work. Any 'ordinary' small mains motor, such as those in a food processor or an electric drill can be used with an 'ordinary' speed controller such as is used for light dimming. In fact, the speed controllers built in to those tools are the same - they're just not housed in a fancy wall-plate. You would undoubtedly need further reduction through gearing but it's something for you to think about. And, by the way, the normal light dimmer/speed controller is rather more than a rheostat or potentiometer. A synchronous motor can not be controlled with such a device because its speed is defined by the supply's frequency, not its voltage (which a speed controller effectively changes.) If the voltage to a synchronous motor is reduced its speed will not change. Keep reducing the voltage and the motor simply stalls and overheats. .
Q:what will happen if dc is applied to ac motor?
short circuit
Q:What happen if AC Supply willl given to a DC Motor ?
it depends on how the DC motor is modulated. Usually a DC motor needs a speed controller to initiate the commutation of the windings because DC doesn't have phases like AC. More than likely, the motor would just buzz or vibrate, but it wouldn't spin. It'd also get pretty hot or it would start arcing across the brushes because the current would have nowhere to go.
Q:AC runs but doesn't blow air and I was told the motor needs replaced, is this true?
Yeah, probibly true. If the fan doesn't run then the indoor coil will freeze up. No reason to check the outdoor unit because you cant tell if the charge is proper while the coil is frozen. If the tech checked the fan and it doesn't run then it's the fan. The price however is very high. Some furnaces have variable speed motors in them that tend to be pricey, but even they aren't that pricey.
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:plz tell me basic difference b/c ac and dc machine in terms of thier working principle?
There are two main types of electric motors. There are direct current or DC and alternating current or AC motors. The reference of DC or AC refers to how the electrical current is transferred through and from the motor. Difference between AC and DC motor somewhat lies in the name as their name reflect their working style. Electric Motor:- It is an electrical device which convert the electrical energy into the mechanical energy. It may be broadly classified into the two types AC motor and the DC motor depending on the type of input used. DC Motors:- A direct current or DC motor, converts electrical energy into mechanical energy and works on Direct current(DC).Among DC motors, there are shunt-wound, series- wound, compound- wound and permanent magnet motors. Dc motors come in two general types. They can have brushes or be brushless. AC Motors:- A current or AC motor, converts electrical energy into mechanical energy and works on alternate current (AC).AC also comes in two type. They can be two phase or three phase.
Q:can i use ac motor in windmill?

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