Error analysis of a demodulation procedure for multicarrier signals with slowly-varying carriers

TL;DR

This paper introduces a demodulation method for multicarrier signals with slowly-varying carriers, demonstrating that the error can be minimized, with applications in sensorless control of AC motors at low speeds.

Contribution

It presents a novel demodulation procedure for slowly-varying multicarrier signals and proves the asymptotic error can be made arbitrarily small.

Findings

Asymptotic demodulation error can be reduced to near zero.

Method applicable to sensorless control of AC motors at standstill.

Provides theoretical proof of error minimization.

Abstract

We propose a procedure to demodulate analog signals encoded by a multicarrier modulator, with slowly-varying carrier shapes. We prove that the asymptotic demodulation error can be made arbitrarily small. The intended application is the "sensorless" control of AC electric motors at or near standstill, through the decoding of the PWM-induced current ripple.