Mechanical damage

...In electrical equipment, the power and motive power that is not effectively used and is lost is called loss, and if the loss is known, the efficiency can be calculated using the following formula. Losses include copper loss, iron loss, and stray load loss, and in rotating machines there is also mechanical loss. Copper loss (also called resistive loss ) is the loss ^that occurs as Joule heat in copper wire in the form of I2R ( I is current and R is resistance), iron loss is the loss that occurs due to magnetic hysteresis and eddy currents when the magnetic flux in the iron core changes over time, mechanical loss is the loss due to friction between stationary and rotating parts (occurring in the bearings and brushes) and the fan action of the rotating parts, and stray load loss is the loss that is not included in the above losses. ...

*Some of the terminology that refers to "mechanical loss" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…電気機器においては，有効に利用されずに失われる電力および動力を損失といい，損失がわかれば効率efficiencyは次式で算出される。損失には銅損，鉄損，漂遊負荷損があり，回転機ではさらに機械損がある。銅損(抵抗損ともいう)はI²R(Iは電流，Rは抵抗)の形で銅線中でジュール熱として発生する損失，鉄損は鉄心中の磁束が時間的に変化するときに磁気ヒステリシスおよび渦電流に基づいて発生する損失，機械損は静止部分と回転部分との間の摩擦(軸受部とブラシの部分で起こる)および回転部分の扇風作用による損失であり，漂遊負荷損は以上の各損失に含まれない損失である。…

※「機械損」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報