Electricity: motive power systems – Induction motor systems – Reversing
Reexamination Certificate
2007-08-28
2007-08-28
Ip, Paul (Department: 2837)
Electricity: motive power systems
Induction motor systems
Reversing
C318S132000, C318S254100, C318S434000
Reexamination Certificate
active
11058843
ABSTRACT:
This invention relates to sensorless control (i.e. without encoder at the motor shaft) of an induction motor (AC asynchronous motor). In particular, the invention comprises a method for a direct measurement of the electromotive forces (EMF) at the stator of the motor to allow for the regulation of the speed of the motor in a wide range, including the very low frequency range. The method provides the accurate measurement of the EMF at the stator in such a way that the direct control of an induction motor will get simpler, in terms of less calculation and, overall, in terms of accuracy and consistency of the results, thanks to the availability of a direct measurement of the EMF instead of a bare estimation thereof. To enable the direct measurement, the employment of at least two sensor windings (sensor coils) is needed each one mutually coupled with the stator phase of the motor.
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Ip Paul
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Zapi S.p.A.
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