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Ch 4 - MyWeb at WIT
Ch 4 - MyWeb at WIT

... Torque speed characteristics with locus of rotor current ...
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... Fact: Salient pole rotors are cheaper to build than smooth. Do hydro-turbine generators have salient poles or smooth? ...
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... other and other stator, rotor and friction losses are controlled. As the phases vary 120 degrees from each other, the efficiency of the motor decreases because it becomes harder for the magnetic fields to turn the rotor. When far enough off, they begin to interfere with each other. This effect can b ...
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... that passes into a heat exchanger that is part of the machine The primary coolant circulates in a closed circuit and yields its heat to the secondary fluid outside the machine that passes into a heat exchanger that is also outside the machine. The primary coolant circulates in a closed circuit and y ...
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... As the magnet is moved past the coils, an induced current in the coils (generator effect) will generate a magnetic field to oppose the motion of the magnet The right end of the coil will become a north pole to exert Fm to the right onto the magnet moved left. When the magnet is pulled out to the rig ...
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Brushed DC electric motor



A brushed DC motor is an internally commutated electric motor designed to be run from a direct current power source. Brushed motors were the first commercially important application of electric power to driving mechanical energy,and DC distribution systems were used for more than 100 years to operate motors in commercial and industrial buildings. Brushed DC motors can be varied in speed by changing the operating voltage or the strength of the magnetic field. Depending on the connections of the field to the power supply, the speed and torque characteristics of a brushed motor can be altered to provide steady speed or speed inversely proportional to the mechanical load. Brushed motors continue to be used for electrical propulsion, cranes, paper machines and steel rolling mills. Since the brushes wear down and require replacement, brushless DC motors using power electronic devices have displaced brushed motors from many applications
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