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An induction motor connected to an existing ac supply normally runs at less than the synchronous speed by an amount described as the 'slip' which is proportional to the torque demanded at the shaft.
If the same motor is instead coupled to an engine and driven at a speed higher than the synchronous speed, with negative slip, power then travels back into the ac supply and the motor has become a generator. The amount of power produced depends on the speed.
However a normal induction motor will not behave as a stand-alone ac generator.
For ac power generation synchronous generators are invariably used because it is necessary to set and maintain the frequency of the supply accurately.
Contrary to DC and synchronous motors, it's a bit tricky to turn an Induction Motor into a generator.
You need to connect charged capacitors to the stator (either in Y or Delta coupling) in order to provide magnetic excitation
and you must turn the rotor ABOVE the rated synchronous speed of the motor.
The Synchronous motor becomes a Synchronous generator when the speed of rotor increase from the rotating magnetic field of the stator.
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If a three phase induction motor runs at a speed greater than synchronous speed?
When an induction motor is pushed over synchronous speed it will become a generator and will deliver power back to the utility.
What is a backwards working electric motor described as?
Electric Generator. :)
Why you not usually use induction generator?
we do not use induction generator because it require an external source (synchronous generator) that provide reactive power to it.
Is capacitor bank needed for generator?
Capacitors are usually used in power systems to corect power factor, which is a ver complex feild. However, yes capacitors are somtimes used with induction generators. When an induction motor is used as a generator, the spinning rotor has no appreaciable magnetisim and so the motor cannot generate electricity. Carefuly selected capacitors overcome the this difficulty induction machines have in generating voltage allowing them to opperate indipendently from another conventional generator.
What is the explanation for the working principle of gear motor?
the gear motor is normally worked by induction and DC motor the gears is the worked of change in motor function
Why is it said that generator is a motor working in reverse?
because working principle of both the things are same.The motor converts electrical energy in to mechanical via magnetic induction and generator do the exact opposite of this.And yes,you should use 'electricity generator' not only 'generator'.
How do you reverse single phase ac motor to generator?
how reversing an ac single phase induction motor to wark as induction generator
Difference between induction motor and induction generator?
in case of induction motor the rotor speed is less than synchronous speed giving positive slip but in case of generator the rptor speed is greater than synchronous speed giving negative slip.......
What is the working principle of motor?
motor works on the principle of mutual induction.
What is squirrel cage induction generator?
Squirrel cage type is a type of Induction motor. It tells that the rotor is "squirrel cage" type. Another type of induction motor is with "slip ring" type of rotor. Squirrel cage type is most widely used Induction motor.
What are the advantages of induction motor?
1. Induction motor has high starting torque, therefore use for operate pump which need high starting torque. 2. Induction motor operate on variable speed. 3. It can be used as generator when speed of motor is higher than synchronous speed.
Why generator has the better efficiency than motor?
becoz alternater has work on principle of electomagnetic induction .
How does a generator use electromagnetic induction?
A generator uses electromagnetic induction by moving a coil of wire through a magnetic field. As the coil moves, it cuts through the magnetic field lines, inducing a current in the coil according to Faraday's law of electromagnetic induction. This current is then transferred out as electrical energy.
If a three phase induction motor runs at a speed greater than synchronous speed?
When an induction motor is pushed over synchronous speed it will become a generator and will deliver power back to the utility.
What is a backwards working electric motor described as?
Electric Generator. :)
What are the advantages of induction generator in college?
what ever the advantages does a induction generator has in industry the same in college
What is kvar rating for 400 hp induction motor generator?
Is this a motor, or is it a generator? You should look at the nameplate. Generators are typically spec'd at .8 - .9 pf. Motors can run as low as .6pf. A 400hp motor definitely should have this information handy with it.
