Siemens High Low Voltage AC Motor

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part namebrandmodelVoltageprotectioncooling
motorSiemens1LA81PQ8400V,690V,2.3KV,4.16KV,6KVIP55IC411 (1LA8,1LA4)
IC416 (1PQ8,1PQ4)

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Q:AC motor on whole house fan won't start sometimes, but if I manually turn it a bit, it will. What's wrong?
House Fan Motor
Q:what is the exact operating principle for induction motor ?
An induction motor or asynchronous motor is a type of alternating current motor where power is supplied to the rotor by means of electromagnetic induction. An electric motor turns because of magnetic force exerted between a stationary electromagnet called the stator and a rotating electromagnet called the rotor. Different types of electric motors are distinguished by how electric current is supplied to the moving rotor. In a DC motor and a slip-ring AC motor, current is provided to the rotor directly through sliding electrical contacts called commutators and slip rings. In an induction motor, by contrast, the current is induced in the rotor without contacts by the magnetic field of the stator, through electromagnetic induction. An induction motor is sometimes called a rotating transformer because the stator (stationary part) is essentially the primary side of the transformer and the rotor (rotating part) is the secondary side. Unlike the normal transformer which changes the current by using time varying flux, induction motors use rotating magnetic fields to transform the voltage. The current in the primary side creates an electromagnetic field which interacts with the electromagnetic field of the secondary side to produce a resultant torque, thereby transforming the electrical energy into mechanical energy. Induction motors are widely used, especially polyphase induction motors, which are frequently used in industrial drives. Induction motors are now the preferred choice for industrial motors due to their rugged construction, absence of brushes (which are required in most DC motors) and—thanks to modern power electronics—the ability to control the speed of the motor.
Q:Why do motors need capacitance when they start?
Only single-phase AC motors use capacitor, DC motor and three-phase AC motor are not needed.The two phase motor coil can not generate a rotating magnetic field, which must be in a coil on series capacitor, the current current branch ahead of another coil, in order to form a rotating magnetic field between the two coils, the rotation of the rotor.
Q:what will happen if dc is applied to ac motor?
Lots of pretty sparks and smoke. Poof, no more AC motor.
Q:how to know the ac motor connection?whether its star or delta?
A lot of motors have 6 wires for the three windings, so you can connect them as star or delta, as required with a star delta starter. The voltage ratings will tell you though. If it is a 380V, 415V, 440V etc. motor and it is connected as star it has a lot less power. If its 220 you have to figure out whether that was for a 127/220 or a 220/380 system. As a check, ((W x 1/PF) / Amps) from the nameplate gives the phase to neutral voltage, or W/A is close enough to tell. Always check the running current when you have installed a motor. Don't forget that the phase rotation may be important for a pump. If a water pump goes backwards there is steam and boiling water everywhere.
Q:how do electric motors work on the ff. devices and machines?
Pumps, Compressors, Washing Machines, Washing Dryers, refrigerators/freezers, potential chairs, electric powered Shavers, Hair Dryers, electric powered automobiles/carts, Lifts (Elevators), Hoists, CD/record gamers, computers, electric powered trains...??
Q:what happens to a 3-phase AC motor when its connected at DC Source?
as the other answers state, the AC motor would just lock up and eventually overheat or destroy the power source! The DC motor however may be fine. If the rotor and field windings are BOTH excited by the power suply, then a DC motor will work normally with AC power. This is because as the current changes direction, both the rotor and stator would swap also, and the overall effect would be the same, meaning the motor would turn normally! many cheap AC motors have commutators and brushes, and could run perfectly well from a suitable DC supply
Q:How to connect a 220V AC electric motor?
Connect the 220 volt power to terminals 1 and 2. Terminal 0 is not connected.
Q:Brushless AC motor
The brushless AC motor produced by our company is the largest in china. There is not much difference in composition, requirements for maintenance and low maintenance, cooling the stator winding more convenient, small inertia, easy to improve the system of fast corrugated pipe coupling, suitable for high speed and high torque working condition, smaller size and weight under the same power.
Q:I want speed range from 800 rpm to 5000rpm ....for that i m using ac motor ...can you help me how to use it?
changing the revs in an ac motor requires you to change the frequency of the supply. revs = number of 120 x frequency / poles. thus a two pole machine on 50 hz will rotate at 3000 rpm. thus a variable speed drive is required.

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