The circular permanent magnetis is fixed in the 24 volt DC motor. The current generates Lorenz force through the coil on the rotor. when the rotor coil parallel with the magnetic field, and then the direction of the magnetic field rotation will be changed.
And at the end of the rotor the brush with conversion piece alternatively contact, thus the direction of the current coil is also changed. But the direction of the generated Lorenz force will not be changed, so the motor can keep revolving in one direction. The 24 volt DC motor has the following advantages.
First, 24 volt DC motor can be equipped with standard gear box, orthogonal hollow shaft of reducer, orthogonal solid shaft reducer, small turbine reducer etc. Second, using 24 V DC motor has large starting torque. Third, it has little change of rotating speed. Fourth, it can install brake or high speed device based on need. Fifth, it has wide application, high efficiency, electricity saving and convenient maintenance.
24 Volt DC Motor&#;s Principle and Advantages
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was last modified: by24v was/is a popular standard for piston driven aircraft since it allowed all the wiring in the airplane to be smaller diameter. This allows a smaller size and weight of the generator/alternator and the starter.
It's my understanding that one of the reasons for a 24v MIL-spec voltage was so that you could jump-start a piston-driven US Army helicopter, observation aircraft, or DC-3 from the NATO receptacle on a Deuce (or genset, etc.). In very cold weather, it's easy to run down the small batteries in an airplane trying to get the thing started. Of course, as ida34 mentioned, then all the radios fit all the vehicles too.
I think all the modern jets have gone to the 400hz AC standard - which is what those generator sets are for.
Civi GM diesel pickups (from the 80's anyway) do use 2 batteries in parallel as you described- 12 volts but twice the amps available. I assume the single battery was not enough on those to crank the diesel without severely stressing the battery, especially if you're also cycling the glow plugs.
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