Method and system for controlling electrical machines

摘要

An embodiment is a method, and related system, to implement the square root extraction operation, which grants a 32 bits precision, which has high execution speed and is able to process a decimal radicand. An embodiment relates to a method for controlling an electric machine, comprising the detection of the value of at least one electrical quantity characterizing the machine operation and processing the detected value of said electrical quantity. The control method controls the machine operation on the basis of this processing. In particular the processing of the detected value of the electrical quantity comprises calculating a square root of a radicand value related to the detected value of electrical quantities. The calculation of the square root includes: calculating an approximated value of the square root, having a first precision, and then calculating a corrective value and combining said approximated value with said corrective value to obtain a square root value having a second precision greater than the first precision.

主权项

1. A control circuit, comprising:
a calculator configured:
to receive a value of a feedback signal;to calculate a resulting root of the value having a resulting precision in response to the value and in response to an initial root of the value having an initial precision, the resulting precision having a greater bit depth than the initial precision; andto generate a control signal in response to the resulting root of the value.