self-excitationn.

Brit.

/ˌsɛlfˌɛksʌɪˈteɪʃn/, U.S.

/ˌsɛlfˌɛksaɪˈteɪʃ(ə)n/

Origin: Formed within English, by derivation. Etymons: self- prefix, excitation n.

Etymology: < self- prefix + excitation n. Compare earlier self-exciting n.

1. The action or process of stirring oneself to action or passion; the action or process of exciting oneself. Now rare.

ΚΠ

1669 T. Watson Heaven taken by Storm 57 Self-examination is a great duty incumbent; it requires self-excitation.

1724 J. Howe Wks. II. 24 There is no vital Principle within, capable of self-excitation and improvement.

1895 Era 7 Dec. It is necessary for the actor to undergo this strain of self-excitation in order to reach that condition of hysteria.

1992 Los Angeles Times (Electronic ed.) 7 Oct. 3 The point seems to be self-excitation, the result a loud tedium on, and a relentless irritation of, the listener.

2. The generation of an electric current, magnetic field, etc., within a device (esp. a dynamo or other rotating electromagnetic induction machine) by the device itself, rather than by an external source.

ΘΚΠ

the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > dynamo > [noun] > excitation of own field

self-excitation1883

1883 Engineer 26 Jan. 59/1 There are three methods of exciting the field magnets of a dynamo..: direct or ordinary self-excitation, where the whole current is sent round the field magnets [etc.].

1908 J. G. Horner Encycl. Pract. Engin. Self-Excitation, the characteristic of a dynamo which enables it to build up a magnetic field upon the rotation of its armature from the residual magnetism of its magnet poles.

1921 J. H. Morecroft Princ. Radio Communication vi. 562 A possible arrangement of self-excitation, in which the phase of the voltage impressed on the grid is adjustable.

1962 Newnes Conc. Encycl. Electr. Engin. 673/1 Unwanted self-excitation with dangerously-high voltages may occur in induction generators.

2007 A. Grebennikov RF & Microwave Transistor Oscillator Design ii. 29 Because an oscillator is an autonomous circuit, electronic noise in the active device or power supply turn-on transient leads to self-excitation of the oscillations.

2016 Daily Mail (Nexis) 4 Oct. (Science section) Through self-excitation, a magnetic field is created from virtually nothing, whereby the complex movement of the conductive plasma serves as an energy source.

This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022).

单词	self-excitation
释义	self-excitationn. Brit. /ˌsɛlfˌɛksʌɪˈteɪʃn/, U.S. /ˌsɛlfˌɛksaɪˈteɪʃ(ə)n/ Origin: Formed within English, by derivation. Etymons: self- prefix, excitation n. Etymology: < self- prefix + excitation n. Compare earlier self-exciting n. 1. The action or process of stirring oneself to action or passion; the action or process of exciting oneself. Now rare. ΚΠ 1669 T. Watson Heaven taken by Storm 57 Self-examination is a great duty incumbent; it requires self-excitation. 1724 J. Howe Wks. II. 24 There is no vital Principle within, capable of self-excitation and improvement. 1895 Era 7 Dec. It is necessary for the actor to undergo this strain of self-excitation in order to reach that condition of hysteria. 1992 Los Angeles Times (Electronic ed.) 7 Oct. 3 The point seems to be self-excitation, the result a loud tedium on, and a relentless irritation of, the listener. 2. The generation of an electric current, magnetic field, etc., within a device (esp. a dynamo or other rotating electromagnetic induction machine) by the device itself, rather than by an external source. ΘΚΠ the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > dynamo > [noun] > excitation of own field self-excitation1883 1883 Engineer 26 Jan. 59/1 There are three methods of exciting the field magnets of a dynamo..: direct or ordinary self-excitation, where the whole current is sent round the field magnets [etc.]. 1908 J. G. Horner Encycl. Pract. Engin. Self-Excitation, the characteristic of a dynamo which enables it to build up a magnetic field upon the rotation of its armature from the residual magnetism of its magnet poles. 1921 J. H. Morecroft Princ. Radio Communication vi. 562 A possible arrangement of self-excitation, in which the phase of the voltage impressed on the grid is adjustable. 1962 Newnes Conc. Encycl. Electr. Engin. 673/1 Unwanted self-excitation with dangerously-high voltages may occur in induction generators. 2007 A. Grebennikov RF & Microwave Transistor Oscillator Design ii. 29 Because an oscillator is an autonomous circuit, electronic noise in the active device or power supply turn-on transient leads to self-excitation of the oscillations. 2016 Daily Mail (Nexis) 4 Oct. (Science section) Through self-excitation, a magnetic field is created from virtually nothing, whereby the complex movement of the conductive plasma serves as an energy source. This entry has been updated (OED Third Edition, January 2018; most recently modified version published online March 2022). < n.1669
随便看	perching machine perching place perching room perchist perchlike perchling perchlor perchloracetic perchloraldehyde perchlorate perchlorate of potash perchlorated perchlorates perchlorbenzene perchloric perchloric acid perchloride perchlorides perchlorinated perchlorination perchloro perchloro- perchloroethane perchloroethylene perchloroethylenes