Floating flame controller

Details Floating flame controller Floating flame controller

2000-07-19

2001-10-09

Berhane, Adolf Deneke (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C318S805000

Reexamination Certificate

active

06301136

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to electrical power conversion. More specifically, the invention relates to a controller for a power converter such as an inverter.
A synchronous motor typically utilizes rotor position sensors for providing information regarding the position of the motor's rotor with respect to the motor's stator windings. The positional information allows for proper conversion of power that is supplied to the stator windings. Rotor position sensors such as Hall effect devices are typically mounted in the stator, proximate the stator windings. The rotor position sensors provide intelligence relative to rotor position.
Rotor position sensors can be unreliable due to mechanical alignment problems (e.g., problems caused by bearings) and temperature incompatibility problems between the stator windings and electronic components such as the Hall effect devices. Moreover, the rotor position sensors can be difficult to mount to the motor during motor assembly, especially for multi-pole motors. In multi-pole motors, the electrical misalignment angle is equivalent to the angular mechanical misalignment angle multiplied by the number of pairs of poles.
SUMMARY OF THE INVENTION
According to one aspect of the invention, a system includes a synchronous machine and a power converter. The power converter is controlled by measuring line current; determining a current Park vector from the current measurement; selecting a reference frame for the current Park vector; rotating the reference frame until a quadrature component of a current Park vector in the rotated reference frame is equal to a predetermined value, whereby a synchronous reference frame is established; and using the synchronous reference frame to control the converter. Thus, the inverter is controlled without the use of rotor position sensors.


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