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The Water Cooler
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<blockquote data-quote="dennishoddy" data-source="post: 2803924" data-attributes="member: 5412"><p>They could have been set up for European 50 hz or other countries. </p><p></p><p></p><p></p><p>A two pole Generator(common for most residential) has to run at 3600RPM for correct frequency. </p><p> One of the most common ways of changing the output frequency of a generator is to change the rotation speed of the engine. </p><p></p><p>The two factors are related as per the following formula &#8211;</p><p>Generator Frequency (f) = Number of revolutions per minute of the engine (N) * Number of magnetic poles (P) / 120</p><p>Conversely, P = 120*f/N</p><p></p><p>As per the above formula, a 2-pole generator producing an output frequency of 60 Hz has an engine speed of 3,600 rpm. To change the output frequency to 60 Hz for the same generator configuration, the engine speed needs to be reduced to 3,000 rpm. Similarly, for a 4-pole generator, an engine speed of 1,800 rpm produces output of 60 Hz. Reducing the engine speed to 1,500 rpm yields an output of 50 Hz.</p><p></p><p>Some of the old Diesel Generator power plants that municipalities had ran the diesel engines at 180 rpm with 32 pole generators. Ponca City is one of them. The engines are HUGE! Pistons are 36" in diameter and 6' tall. Typically 11-13 cylinders. They don't use them any more. My dad spent 36 years operating and maintaining them in the Ponca Diesel power plant. I worked part time there at night while in college.</p></blockquote><p></p>
[QUOTE="dennishoddy, post: 2803924, member: 5412"] They could have been set up for European 50 hz or other countries. A two pole Generator(common for most residential) has to run at 3600RPM for correct frequency. One of the most common ways of changing the output frequency of a generator is to change the rotation speed of the engine. The two factors are related as per the following formula – Generator Frequency (f) = Number of revolutions per minute of the engine (N) * Number of magnetic poles (P) / 120 Conversely, P = 120*f/N As per the above formula, a 2-pole generator producing an output frequency of 60 Hz has an engine speed of 3,600 rpm. To change the output frequency to 60 Hz for the same generator configuration, the engine speed needs to be reduced to 3,000 rpm. Similarly, for a 4-pole generator, an engine speed of 1,800 rpm produces output of 60 Hz. Reducing the engine speed to 1,500 rpm yields an output of 50 Hz. Some of the old Diesel Generator power plants that municipalities had ran the diesel engines at 180 rpm with 32 pole generators. Ponca City is one of them. The engines are HUGE! Pistons are 36" in diameter and 6' tall. Typically 11-13 cylinders. They don't use them any more. My dad spent 36 years operating and maintaining them in the Ponca Diesel power plant. I worked part time there at night while in college. [/QUOTE]
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