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Electric Motors Quiz
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MOTOR BASICS
BASIC COMPONENTS
*
Armature - Sometimes called a rotor. This is the part that spins. The armature can be either a permanent magnet or an electromagnet.
* Stator - This is the part that doesn't move. The rotor spins in the magnetic field contained in the stator.
HOW WORKS A MOTOR?
The force that that turns the armature comes from the magnetic field of the armature trying to line up with the external magnetic field of the stator. This force is called torque. This torque will cause the armature to turn until its magnetic field is aligned with the external field, but no further. How does the armature continue to spin? One of the magnetic fields must be changed so that the armature has to turn again. The armature will spin so long as there is always a torque acting on it. How this is accomplished is what sets each type of electric motor apart.
DIRECT CURRENT MOTORS
SIMPLE DIRECT CURRENT MOTOR
In a DC motor, the armature consists of any number of windings, each one an electromagnet. The armature is immersed in a directional external magnetic field. This external field does not move, and can come from permanent magnets or electromagnets.
A direct current in a set of windings creates a polar magnetic field. A torque acts on the rotor due to its relation to the external magnetic field. Just as the magnetic field of the rotor becomes fully aligned with the external magnetic field, the direction of the current in the windings on the armature reverses, thereby reversing the polarity of the rotor's electromagnetic field. A torque is once again exerted on the rotor, and it continues spinning.
The change in direction of current is facilitated by the split ring commutator. The brushes remain stationary, but they are in contact with the armature at the commutator, which rotates with the armature such that at every 180° of rotation, the current in the armature is reversed.
BRUSHLESS DIRECT CURRENT MOTOR
A brushless DC motor has a permanent magnet or magnets for the armature. The external magnetic field comes from any number of electromagnets that are turned on and off at the correct times by a timing device.
The exact workings of different brushless DC motors depend on the type of timing device used. This example uses a Reed switch.
2. Now the belt is turning. This makes the secondary clutch turn, which causes the track to turn and the snowmachine to move forward.
direction. The third wheel was hooked up to the wheel frame and free to rotate
With a little stretching, the average physics student should be able to comprehend the principles of magnetic levitation and propulsion through synchronous linear motors. To facilitate the process of understanding this complex material, we suggest that the student go through this web site in order. Make sure you understand the basic physics before moving on to the page which applies these principles to magnetically levitated vehicles.
...late 17th century, and beginning of the 18th century, transportation was favored by American society so much, the wealthier would hire chauffer’s to take people places. So not only did the motor produce a better and more efficient life style, it also created a huge business industry, as we know it today called, “valeting”. The actual motor worked like this. “Two cups filled with mercury would contain a magnet and a wire with one being fixed and the other free to move. Whenever a current was passed through the wire, the free moving magnet or wire would revolve around its fixed partner due to the electromagnet forces being produced.” (History of Innovation). This first motor was a prime example of the fact that movement could be created by electricity and electricity could be created by friction. This motor was the most useful and applicable invention in the 1800’s.
There is three propellers which were working by the steam, the rotation of the propellers were working by the movement.
How this marvel of engineering works is the rotor rides on an offset in the crankshaft, similar to a piston nand connecting rod assembly, and is rotated in an oval shaped case with ports for intake, exhaust and spark plugs. Incorporated into the rotor is a ring gear which had another gear that is stationary in the center, this planetary gear set is what keeps the rotor in time with the rest of the engine. The rotor creates three sealed areas where the different strokes will take place simultaneously, these three areas are sealed by strip of metal called the Apex seal which have the same function as the piston rings in a traditional internal combustion engine. The intake and ...
The lever. The lever consists of a beam and a pivot point.
is connected to a shaft, which spins a disc. The disc has holes in it
The actuator is controlled using two very strong magnets which move the arm around. While it might seem that the magnets would interfere with the magnetic storage on the platter, the magnets that control the actuator are positioned on a vertical axis, so the field they produce does not modify the storage on the platter. It is because of the nature of a hard drive that magnets can also be so harmful to them. If you were to take a magnet and stick it to the top of a hard drive, the magnet would alter the states existing on the platter resulting in a loss of data
The basic trimmer works by the engine driving a multi-bearing supported hardened steel shaft housed in an aluminium tube through a centrifugal clutch this shaft is connected to a “head” that holds a nylon line that spun at high revolutions per minute (RPM). This nylon line then cuts the grass by hitting the blades of grass at high speed, this cause the grass to be severed at the point of impact. Thus trimming the grass.
... spring, you are causing a twisting motion all the way down the coil. (Longhurst)
To understand how this motor works, we must understand the relationship between electricity, and magnetism or simply put electromagnetism. Direct electric current in a simple description: There are two requirements for current flow. The first is a source of electrical potential energy or EMF (electro motive force,). The second is a conductor that provides a complete loop to carry the current. The reason a conductor will conduct is found on the atomic level. A conductive atom’s valance shell is not completely full electrons will flow from atom to atom because of this. When these electrons move from one atom to another that is electrical current (a brief description that is).
A VFD is a device that controls the voltage and frequency that is being supplied to a motor. Therefore it controls the speed of the motor and the system is diving. It is also capable of adjusting both the speed and the torque of an induction motor. Consequently it provides continuous range process speed control as compared to discrete of stepwise co...
The necessity of motion to produce a current is due to the fact that electromagnetic induction involves a time-varying magnetic field. The same effects can be produced by moving the coil toward and away from a motionless magnetic source. In either case, the key to producing the current is certainly the motion of the magnet or the wire. The magnetic lines of the magnetic field must pass through a loop of the coiled wire.
...which moves a magnet back and forth through a coil of wire to generate electrical current in the wire. To prevent physical wear the piston does not actually touch the inside of the mechanism. This generator is mostly used in NASA projects.