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The general principle that the article changes according to electric machinery power, the essence that put forward and proves constant torsion timing depends on the axial power of electric machinery controlling, rotate speed adjustment is power pilot is answered, its key controls axial power to how carry electric power.

Torsion is controlled only comfortable Yu Henggong leads timing, it is electric machinery timing only is local, is not the common law of timing. Of basis of frequency control place is torsion control, what carry out actually is power control however, because this ability is done not have,affect applied validity.

One, power control and torsion control

Change a principle according to Electromechanical energy, every electromotor can differentiate give priority to magnetic pole and armature two functions part. Advocate the action of magnetic pole is to build advocate magnetic field, armature is with magnetic field interaction changes electromagnetism power the power that it is an axis.

Of dc motive advocate magnetic pole and armature not only the structure is bright, and the function is independent, accord with above definition undoubtedly. And communication (asynchronous) electromotor differentiates with stator, rotor normally form, need to add a specification.

Narrate armature definition according to place, the axial power of asynchronous machine arises at rotor, accordingly, the armature with asynchronous real opportunity is rotor. The problem depends on stator, on one hand stator excitation arises advocate magnetic field, reason stator is advocate magnetic pole. On the other hand, stator is armature through electromagnetism induction again (rotor) carry electromagnetism power, do not produce axial power however, because this stator has the partial feature of armature again, we call it here bogus armature. This kind of compound function of stator, it is asynchronous machine distinguishs the main feature at dc machine.

Output angle observation from armature, the relation of the axial power of electromotor and rotate speed of electromagnetism torsion machinery is:

Ω of M of P M ＝ (１ )

Or M of ／ of M of Ω ＝ P (2)

Formulary (2) besides gave out beyond the relation of value of a quantity between electric machinery rotate speed and axial power and electromagnetism torsion, make clear at the same time, electric machinery rotate speed can carry axial power finally only or two kinds of control obtain electromagnetism torsion adjust, former abbreviation power is controlled, latter abbreviation torsion is controlled.
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