Load angle determination for electrical motors

Details Load angle determination for electrical motors Load angle determination for electrical motors

2006-01-24

2006-01-24

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

C318S254100, C318S132000, C318S434000, C318S700000

Reexamination Certificate

active

06989648

ABSTRACT:
An electrical motor comprises a stator1and a rotor2, the stator1having poles3facing circumferential surfaces of the rotor2so that the stator1forms a magnetic circuit with the rotor2. The stator1further has stator windings5grouped into two or more phase windings A, B, which phase windings are separately energisable to induce stator magnetic fields which interact with magnetic fields associated with the rotor2. A voltage across a stator phase winding is detected by voltage detecting means. Processing means18to20is provided for determining from one or more voltage measurements the rotor flux linking said stator phase winding, or a value which is a function of the rotor flux linkage, when the excitation current in said stator phase winding is at a known point in its cyclic variation chosen to substantially eliminate from the rotor flux or said function inductive and/or resistive contributions, and for determining from the rotor flux linkage or said function thereof the load angle of the motor.

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