On Commutation and Primitive Roots of Codes
نویسندگان
چکیده
منابع مشابه
The Influence of DC-Link Voltage on Commutation Torque Ripple of Brushless DC Motors with Two-Segment Pulse-width Modulation Control Method
The commutation process causes current ripple to be generated in the drive system of brushless DC (BLDC) motor. This, in turn, leads to output torque ripple. Mechanical vibration and acoustic noise are its influences which are undesirable phenomenon in some applications. A new method is presented in this paper which reduces torque ripple and commutation period in the entire range of motor speed...
متن کاملA Novel Method for Commutation Torque Ripple Reduction of Four-Switch, Three-Phase Brushless DC Motor Drive
This paper presents an original study on the generated torque ripples of phase commutation in the Four-Switch, Three-Phase Inverter (FSTPI) Brushless DC (BLDC) motor drive which is suitable for low cost applications. Analytic values of torque ripple and commutation duration are obtained for different operation conditions. Moreover, limitation on the speed range operation caused from splitti...
متن کاملDivisibility of polynomials over finite fields and combinatorial applications
Consider a maximum-length shift-register sequence generated by a primitive polynomial f over a finite field. The set of its subintervals is a linear code whose dual code is formed by all polynomials divisible by f . Since the minimum weight of dual codes is directly related to the strength of the corresponding orthogonal arrays, we can produce orthogonal arrays by studying divisibility of polyn...
متن کاملThe commutation of finite sets: a challenging problem
We prove that given a set X of two nonempty words, a set Y of nonempty words commutes with X if and only if either Y is a union of powers of X or X; Y t + for some primitive word t. We also show that the same holds for certain special types of codes, but does not hold in general for sets of cardinality at least four.
متن کامل(19) United States Correcting Wom Codes, Coding Strong Single and Multiple Error Correcting Wom Codes, Coding Methods and Devices Priority Claim and Reference to Related Application
Yaakobi et al. (57) ABSTRACT Preferred embodiments of the invention provide WOM cod ing methods and electronic devices With error correcting codes that provide single, double and triple error correction. Preferred codes of the invention also the following property: if the code corrects tWo/three errors it has tWo/three parts of redundancy bits. For double error correction, if only one part of t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2001