Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1985-05-10
1986-12-02
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318805, 318808, 324158MG, H02P 540
Patent
active
046267611
ABSTRACT:
For determining the flux vector, an EMF vector (e.sub.s) is formed in an EMF detector (15) from the stator current and the stator voltage, the components of which are determined in a rotating coordinate system rotated by an angle (.beta.) relative to the coordinate system which is fixed with respect to the stator. The flux vector (.psi..sub..beta.) is formed in the rotating coordinate system, taking into consideration the rotary EMF component (e.sub..beta..sup.R) which is generated from the flux vector through rotation by .pi./2 and multiplication by the frequency of rotation (.beta.). The angle of rotation (.beta.) is determined by feeding the direction deviation of the flux vector (.psi..sub..beta.) or a reference vector (.psi.*) for the flux vector by the angle (.beta.) to a servo control (27 or 30, respectively), the output signal of which is fed as the speed of rotation (.beta.) via an integrator (20) for forming the angle of rotation (.beta.).
REFERENCES:
patent: 4388577 (1983-06-01), Blaschke et al.
patent: 4423367 (1983-12-01), Blaschke et al.
Siemens Aktiengesellschaft
Smith Jr. David
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