សំលេងរំខានអគ្គិសនី និងមេកានិចក៏ជាបញ្ហាដែរ។ សំឡេងអគ្គិសនីកើតឡើងដោយការបញ្ឆេះ និងផ្ទុះនៅពេលជក់បង្កើត និងបំបែកទំនាក់ទំនងនៅលើឧបករណ៍ផ្លាស់ប្តូរ។ ជាការប្រុងប្រយ័ត្ន ម៉ាស៊ីនបូមឥន្ធនៈភាគច្រើនមាន capacitors និង beads ferrite នៅលើការបញ្ចូលថាមពល ដើម្បីកំណត់សំលេងរំខានប្រេកង់វិទ្យុ។ សំលេងរំខានមេកានិកពី impeller, pump gears and bearing assembly, or cavitation from low oil is amplified as a oil tank as like a big speaker to amplify even the smallest sounds.
Brushed fuel pump motors are generally inefficient. Commutator motors are only 75-80% efficient. Ferrite magnets are not as strong, which limits their repulsion. The brushes pushing on the commutator create energy which ultimately eliminates friction.
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