Electricity: motive power systems – With flywheel or massive rotary member
Patent
1976-07-06
1977-11-29
Hohauser, Herman
Electricity: motive power systems
With flywheel or massive rotary member
318254, H02K 2900
Patent
active
040607534
ABSTRACT:
A control system for commutatorless motor comprising a synchronous motor having a multi-phase armature winding and field winding, a frequency converter for supplying a-c current of variable frequencies to the armature winding, a position detector for detecting the position signal based on the rotational position of the synchronous motor, a voltage setting circuit for producing a constant exciting reference signal for determining the magnitude of the terminal voltage of the synchronous motor, a first operational circuit for determining the magnitude of the nominal induced electromotive force representing the vector sum of the armature reaction drop and terminal voltage on the basis of the signal proportional to the armature current and constant exciting reference signal, a second operational circuit for obtaining the phase difference between the nominal induced electromotive force and terminal voltage obtained from the first operational circuit, a field control means for controlling, the field constant current given to the field winding according to the magnitude of the nominal induced electromotive force as obtained by the second operational circuit, a constant phase reference circuit for producing the current phase reference signal advanced in phase by the phase difference as obtained on the basis of the position signal as derived from the second operational circuit and current control means for controlling the armature current for adjusting the firing phase of the frequency converter on the basis of the current reference signal and current phase reference signal.
REFERENCES:
patent: 3749991 (1973-07-01), Kuniyoshi
patent: 3887862 (1975-06-01), Hubner
Kubota Yuzuru
Okuyama Toshiaki
Hitachi , Ltd.
Hohauser Herman
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