Method for the formation of the actual load angle value for a fi

Details Method for the formation of the actual load angle value for a fi Method for the formation of the actual load angle value for a fi

1990-05-29

1991-01-29

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318805, H02P 540

Patent

active

049889400

ABSTRACT:
A method for the formation of the actual load angle value for a field-oriented regulated rotary field machine and apparatus for field-oriented regulation of the machine. In order to impress in a voltage-impressing converter the load angle, i.e. the angle between field axis and stator current vector, an angle regulator is used to which a given nominal load angle value (wif*) is supplied. In order to form from the stator-oriented acutal current angle (wis) tapped off at the machine via a current detector (I-DET) the actual load angle value associated the nominal load angle value with wif*, by a decoupling computing unit (CAL) from the given components of the field-oriented nominal current vector, the field-oriented angle (wuf*) of the associated field-oriented nominal voltage vector is calculated and subtracted from the stator-oriented angle (wus) of the actual voltage vector. The actual load angle value (wif) is then given by wis-wus+wuf*. The output signal of the angle regulator (W-REG) and the decoupling computing unit (CAL) form the input quantities of the trigger unit for a voltage-impressing converter (PWR) feeding the machine at which the stator-oriented voltage angle (wus) can be tapped off.

REFERENCES:
patent: 4310791 (1982-01-01), Akamatsu
patent: 4330741 (1982-05-01), Nagase et al.
patent: 4338559 (1982-06-01), Blaschke et al.
patent: 4626761 (1986-12-01), Blaschke
patent: 4764712 (1988-08-01), Blaschke et al.

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