Applications of a ac generator

Answer 1

elevator motors

Answer 2

Applications of DC Generators:

1. DC shunt Generator

The terminal voltage of DC shunt generator is more or less constant from no load to full load .Therefore these generators are used where constant voltage is required.

• For electro plating
• Battery charging
• For excitation of Alternators.

2. Series Generators:

The terminal voltage of series generator increases with load current from no load to full load .Therefore these generators are,

• Used as Boosters
• Used for supply to arc Lamps

3. Compound Generator:

• Differential Compound generators are used to supply dc welding machines.
• Level compound generators are used to supply power for offices ,hostels and Lodges etc.
• Over compound generators are used to compensate the voltage drop in Feeders.

4. Separately Exited Generator:

• As a supply source to DC Motors ,whose speed is to be controlled for certain applications.
• Where a wide range of voltage is required for the testing purposes.

Electrikals..

Answer 3

Applications in General (including solar/wind hybrid, prime power, and backup): # The DC generator system is designed and optimized to deliver the high currents at low voltages required for battery charging and operating DC loads. No battery chargers or power supplies are required. # DC generators do not require a transfer switch. Transfer switches lower system reliability. # In prime power applications the DC generator lowers the overall cost of the system. # Certain AC generators and switch mode power supplies are incompatible. These AC generators have voltage regulators that cannot regulate voltage due to the current pulsing load of the switch mode power supplies. Polar's DC generators when connected to a battery do not suffer this incompatibility. # DC generators are more fuel-efficient. Site operators want the longest run time with the least amount of fuel on site. # Polar's DC generators are simpler in design, have considerably less maintenance and are more reliable than AC generators. Propane carburetion and electronic speed governors require frequent calibration and testing. If the propane carburetion, ignition system, or governor speed control should develop a problem, alternator voltage regulation and frequency control will fail. Some equipment powered by the generator will be damaged, other equipment may survive. How many of your AC loads can tolerate a wide swing in frequency? # Polar's DC generators have a current limit control to prevent the alternator from overheating and the engine from stalling during shorts or overloads. This feature is extremely important in battery charging because a battery in a low state of charge can demand more power than the generator or battery charger can manage. Polar's DC generators will continues to supply power under current limit control, allowing the battery to increase its charge and drop its current demand. The AC generator uses a fuse or circuit breaker to protect against shorts and over current so the battery fails to get charged if it is overly discharged. The additional problem is that for remote sites a person is required to visit the site to replace or reset the fuse or circuit breaker and devise a means where the batteries can be brought to a state of charge where the batteries can take over. # Polar's DC generators can be connected in parallel and load share. Paralleling these small AC generators is not practical. In many projects there are concerns about future site expansion and given load estimates are sometimes understated. # Maintainability. DC generators use smaller engines that can be lifted by hand and transported to a shop for repair. The high-level generator mechanics are not required, or their expensive travel time to the site. # AC generators are typically oversized to handle starting currents of motors and to provide light enough engine loads to facilitate speed regulation. Engines that are lightly loaded build up carbon around the valves and exhaust lines (wet stacking) this creates additional engine maintenance. # DC generators are considerably smaller in size and use smaller horsepower engines. This facilitates both roof mount installations and installations inside the small shelters, as well as the required permit process. # DC generator lowers the costs to install and operate. It is smaller in size and requires less site support. Transport to the site and installation is facilitated because: smaller shelter and concrete pads can be used, elevator transport to roof rather than crane, smaller helicopters or vehicles for transport. Fuel consumption is lower, so cost to transport fuel to the site is lower (transportation of the fuel to the site can be very expensive). # Engines need a warm up period before they are able to provide full power, for an AC generator this translates to providing a stable frequency and voltage. Polar's DC generator can deliver power at a reduced level immediately after starting, then switch to full power after warn up. Also a cold engine can exhibit speed fluctuations, which has no effect on Polar's DC generators.

Answer 4

Hybrid electric vehicle (HEV) drive systems, automotive starter generators, aircraft auxiliary power generation, wind generators, high speed gas turbine generators.

Answer 5

for industrial and commercial purpose generators are used

Answer 6

It would be used when the output voltage must be finely controlled by the field current.