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An alternator is a device that converts mechanical energy into electric energy. This is done in the form of an electric current. In essence, an AC electric generator could be called an alternator. The word usually refers to a small, rotating device powered by automotive and different internal combustion engines. Alternators which are placed in power stations and are driven by steam turbines are actually known as turbo-alternators. Most of these machines use a rotating magnetic field but every so often linear alternators are utilized.
Whenever the magnetic field all-around a conductor changes, a current is generated within the conductor and this is actually the way alternators produce their electricity. Normally the rotor, which is actually a rotating magnet, turns within a stationary set of conductors wound in coils located on an iron core which is called the stator. Whenever the field cuts across the conductors, an induced electromagnetic field otherwise called EMF is generated as the mechanical input causes the rotor to revolve. This rotating magnetic field generates an AC voltage in the stator windings. Normally, there are 3 sets of stator windings. These physically offset so that the rotating magnetic field induces 3 phase currents, displaced by one-third of a period with respect to each other.
"Brushless" alternators - these use brushes and slip rings together with a rotor winding or a permanent magnet in order to generate a magnetic field of current. Brushlees AC generators are normally located in bigger devices like for example industrial sized lifting equipment. A rotor magnetic field can be produced by a stationary field winding with moving poles in the rotor. Automotive alternators often use a rotor winding which allows control of the voltage induced by the alternator. It does this by changing the current in the rotor field winding. Permanent magnet devices avoid the loss due to the magnetizing current within the rotor. These devices are restricted in size because of the cost of the magnet material. The terminal voltage varies with the speed of the generator as the permanent magnet field is constant.
Forklifts are used in almost all industrial construction sites and in warehouse operations and in boat yards. The reach feature of a lift truck is a very important part used in several applications such as when a shelving system is being used to stack pallets. A forklift operator would utilize the machine's reach feature to grab pallets that could be positioned on a top shelf and areas harder to grasp.
It is essential for an operator to firstly test the machine and help familiarize the operations of a reach. Learn how the equipment moves, turns, check the speed that the lift truck travels and how fast it can lift and drop objects before you attempt to handle goods. Note whatever safety features which may come into play. Pay attention to how the machine would slow down when the tines are up in the air.
Start with picking up lighter objects such as an empty pallet, to be able to become comfortable with the reach function of the forklift. As soon as the pallet is attached to the blades, tilt them back so the load can safely sit against the grate. This safety grate is positioned at the back the the blades and keeps the load from sliding. Set pallets down where desired by reversing the process. Tilt the tines down over the intended spot and level them. The pallets must simply slide away from the safety grate. Set the pallets down.
