magnetomotiveadj.
/maɡˌniːtəʊˈməʊtɪv/, U.S. /mæɡˈˌnɛdoʊˈˌmoʊdɪv/, /mæɡˈˌnidoʊˈˌmoʊdɪv/ Physics.
magnetomotive force n. a scalar quantity which represents the line integral of the magnetic field strength around a closed path in the field (introduced as a concept analogous to electromotive force). Cf. initialism m.m.f.
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magnetomotive force1883
m.m.f.1893
1883 R. H. M. Bosanquet in London, Edinb., & Dublin Philos. Mag. 5th Ser. 15 205 I shall use the expression ‘magnetomotive force’ to indicate the analogue of electromotive force. It is a difference of magnetic potential.
1896 S. P. Thompson Dynamo-electr. Machinery (ed. 5) 119 The total magnetomotive-force in a magnetic circuit is the sum of the magnetomotive-forces separately produced by each coil of wire.
1925 H. C. Booth tr. F. Auerbach Mod. Magnetics (U.K. ed.) i. 8 There is still another kind of effect which we have now to discuss: the magneto-motive force—the excitation of magnetism in a bar hitherto non-magnetic.
1946 Nature 5 Oct. 489/1 It is more satisfactory to employ an independent theory developed by finding an expression for the pulsating permeance of the magnetic path and considering the total magneto-motive force acting upon that permeance.
1976 B. I. Bleaney & B. Bleaney Electr. & Magn. (ed. 3) iv. 105 By analogy with electromotive force..the quantity −ϕ is sometimes known as the ‘magnetomotive force’, or m.m.f.
1997 IEEE Trans. Energy Conversion 12 269 It is possible to make a motor characteristic analysis by taking into consideration the action of all significant space harmonics of the magnetomotive forces (MMF) to [sic] the rotor cage winding.
This entry has been updated (OED Third Edition, March 2000; most recently modified version published online March 2022).
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adj.1883