Hi, does brushless alternator is the same as we see in automobile alternators, or Is it that you are referring to you is Permanent magnet Alternator? Also is the torque requirements same as that for a normal alternator and an Permanent magnet Alternator?
Inside the rotor wheee the claw is, are there suppose to be windings inside the claw as well? Our website uses cookies to improve your experience. Learn more. With Diagram by Bijoy Chandrasekhar.
Operation Principle of Brushless Alternator In all alternators, voltage may be generated by rotating a coil wire in the magnetic field or by rotating a magnetic field within a stationary coil wire. It doesn't matter whether the coil is moving or the magnetic field is moving. Either configuration works equally well and both are used separately or in combination depending on mechanical, electrical and other objectives.
In the case of brushless alternator both combinations are used together in one machine. Before going to the explanation part you should know about stator,rotor,field windings and armature. The stationary part of an alternator is called the stator and the rotating part is called the rotor. The coils of wire used to produce a magnetic field are called the field winding and the coils that the power are called the armature winding.
Here you can see both Armature and Field winding used as rotor as well as startor. Unknown 14 April at Bijoy Chandrasekhar 14 April at Bijoy Chandrasekhar 22 May at Usman Ghani 6 November at Unknown 24 December at Unknown 2 September at Anonymous 16 March at When problems arise troubleshooting is simplified with less components and wiring to validate.
As the generator is rotated, the stator supplies input voltage to the AVR. In addition the AVR has sensors that monitor the output of the stator. The current is induced onto the stator for load output. The biggest drawback to this system is the AVR is impacted by the load the generator is powering. When the load increases the voltage begins to decrease and the AVR must provide more current to the exciter to support the demand.
This mechanism is called excitation system. We all know that on the basis of excitation system, Alternators mainly are of two types- 1 Separately Excited system, 2 Self Excited system. The basic difference is that separately excited system have Permanent Magnet Generator PMG for powering the Automatic Voltage Regulator AVR and there is one Isolation Transformer for sensing the voltage for AVR and in the other hand for self-excited Alternator, there is residual magnetism in the exciter field to initialize the voltage ramp-up process and after voltage build-up, Isolation Transformer which is responsible for voltage sensing for AVR , start powering the AVR as well.
Which means in self-excited Alternator, Isolation Transformer is responsible for two things- 1 Sensing Voltage 2 Powering AVR after initial voltage build-up due to residual magnetism. Sometimes you may face one problem that there is no voltage build-up in the Self-excited Alternator. The reason is lack of Residual Magnetism. Then what you have to do, remove the AVR, flash the exciter field by connecting a 12V DC battery and a blocking diode to the exciter field and after that start the engine, if you see now voltage is building up, then it is confirm that Exciter field has been flashed successfully.
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