Table of Contents
How many poles are there in a generator?
This generator (or motor) has four poles at all times, two South and two North. Since a four pole generator will only take half a revolution per cycle, it will obviously make 25 revolutions per second on a 50 Hz grid, or 1500 revolutions per minute (rpm).
What is pole in stator?
The motor drive energizes stator teeth one after the other to make the rotor turn, thanks to its magnets’ tendency to force alignment with the stator teeth. Simply defined, a pole is a north or south magnetic field of force that is generated by a permanent magnet or current passing through a coil of wire.
What is a stator in a generator?
The stator is the stationary part of a rotary system, found in electric generators, electric motors, sirens, mud motors or biological rotors. In an electric motor, the stator provides a magnetic field that drives the rotating armature; in a generator, the stator converts the rotating magnetic field to electric current.
Do permanent magnet motors have poles?
The poles of a motor are simply the north-south magnetic points on the stator and rotor. In PMACMs, these poles are permanent in the rotor and are switched in the stator to produce rotation. Cogging usually happens upon startup of the motor and can cause vibrations, noise, and uneven rotation.
What is the difference between 2 pole and 4 pole generator?
Actually the difference between 2 pole and 4 pole AC alternators is the speed at which they operate, in Europe we typically use 50Hz per second or cycles and North America 60Hz as the frequency, a two pole alternator has to operate at a higher speed than a 4 pole, for example an alternator is driven at 3000 rpm to …
How do you find stator poles?
The actual running speed is the synchronous speed minus the slip speed. To determine the number of poles, you can read the data plate directly or calculate it from the RPM stated on the data plate or you can count the coils and divide by 3 (poles per phase) or by 6 (pairs of poles per phase).
What is stator made of?
The stator frame consists of laminations of silicon steel, usually with a thickness of about 0.5 millimetre. Lamination is necessary since a voltage is induced along the axial length of the steel as well as in the stator conductors.
How does the stator work?
The stator is the coil of wire housed inside the engine case. A magnet on a shaft spins within the stator, creating alternating current (AC). That current travels along fairly heavy gauge wire through the case and into the rectifier/regulator which converts it to DC power, and at a consistent output.
How is the speed of a permanent magnet motor controlled?
A permanent magnet (PM) motor is an ac motor that uses magnets imbedded into or attached to the surface of the motor’s rotor. Controlling the speed of ac motors is accomplished using a variable frequency drive (VFD) in most cases.
How do PMAC motors work?
A permanent magnet AC (PMAC) motor is a synchronous motor, meaning that its rotor spins at the same speed as the motor’s internal rotating magnetic field. Other AC synchronous technologies include hysteresis motors, larger DC-excited motors, and common reluctance motors.