Bobe,
zakladem jeho tvrzeni je popis tzv CEMF - nasel jsem prima definici na Wiki:
Counter-electromotive force
From Wikipedia, the free encyclopedia
The counter-electromotive force (abbreviated counter emf, or CEMF ) [1] is the voltage, or electromotive force, that pushes against the current which induces it, is caused by a changing electromagnetic field. It's represented by Lenz's Law of electromagnetism. Back electromotive force is a voltage that occurs in electric motors where there is relative motion between the armature of the motor and the external magnetic field. Counter emf is a voltage developed in an inductor network by a pulsating current or an alternating current. [2] The voltage's polarity is at every moment the reverse of the input voltage [3] [4]
In a generator using a rotating armature and, in the presence of a magnetic flux, the conductors cut the magnetic field lines as they rotate. The changing field strength produces a voltage in the coil; the motor is acting like a generator.. (Faraday's law of induction.) This voltage opposes the original applied voltage; therefore, it is called "counter-electromotive force". (by Lenz's law.) With a lower overall voltage across the armature, the current flowing into the motor coils is reduced. [5]
If it is assumed that a motor is 100% efficient with no friction or windage losses, the speed of the armature will increase until the back electromotive force is equal to the applied electromotive force, i.e. there will be no net electromotive force, no current flow and hence, no net force. The armature will spin at a constant rate, of its own accord.
Ve zkratce, pokud se kotva otaci v poli, vyviji se v ni napeti pusobici proti proudu, ktery do ni pousti zdroj. Toto napeti je zavisle na otackach kladne. Jinymi slovy pokud chceme na vystupu stroje udrzovat konstatni vykon pri rostouci rychlosti otaceni (hperbola), musime zvysovat vykon zdroje o cast, ktera pokryje prave tuto ztratu.
Nebo opacne, pokud ma zdroj konstatni vykon, vykon na vystupu stroje klesa prave o ztraty zpusobene touto silou (CEMF - counter electromotive force)
Odvolavaji se na Lenzuv zakon.
Priznam se, ze jsem studoval pred vice nez 20 lety, takze bych se doma musel podivat,ale na prvni pohled se mi to zda docela konzistentni s tim co vidime v charkateristikach.
zakladem jeho tvrzeni je popis tzv CEMF - nasel jsem prima definici na Wiki:
Counter-electromotive force
From Wikipedia, the free encyclopedia
The counter-electromotive force (abbreviated counter emf, or CEMF ) [1] is the voltage, or electromotive force, that pushes against the current which induces it, is caused by a changing electromagnetic field. It's represented by Lenz's Law of electromagnetism. Back electromotive force is a voltage that occurs in electric motors where there is relative motion between the armature of the motor and the external magnetic field. Counter emf is a voltage developed in an inductor network by a pulsating current or an alternating current. [2] The voltage's polarity is at every moment the reverse of the input voltage [3] [4]
In a generator using a rotating armature and, in the presence of a magnetic flux, the conductors cut the magnetic field lines as they rotate. The changing field strength produces a voltage in the coil; the motor is acting like a generator.. (Faraday's law of induction.) This voltage opposes the original applied voltage; therefore, it is called "counter-electromotive force". (by Lenz's law.) With a lower overall voltage across the armature, the current flowing into the motor coils is reduced. [5]
If it is assumed that a motor is 100% efficient with no friction or windage losses, the speed of the armature will increase until the back electromotive force is equal to the applied electromotive force, i.e. there will be no net electromotive force, no current flow and hence, no net force. The armature will spin at a constant rate, of its own accord.
Ve zkratce, pokud se kotva otaci v poli, vyviji se v ni napeti pusobici proti proudu, ktery do ni pousti zdroj. Toto napeti je zavisle na otackach kladne. Jinymi slovy pokud chceme na vystupu stroje udrzovat konstatni vykon pri rostouci rychlosti otaceni (hperbola), musime zvysovat vykon zdroje o cast, ktera pokryje prave tuto ztratu.
Nebo opacne, pokud ma zdroj konstatni vykon, vykon na vystupu stroje klesa prave o ztraty zpusobene touto silou (CEMF - counter electromotive force)
Odvolavaji se na Lenzuv zakon.
Priznam se, ze jsem studoval pred vice nez 20 lety, takze bych se doma musel podivat,ale na prvni pohled se mi to zda docela konzistentni s tim co vidime v charkateristikach.
))
