Estimation of the Mechanical Position of Reciprocating Compressor for Silent Stoppage

Anton Dianov

doi:10.1109/ojpel.2020.2978300

Abstract

This paper proposes the solution for decreasing of the reciprocating compressor noise and vibrations, which happens at stoppage. These vibrations and resulting noise are caused by the gas pressure in the cylinder, which impacts the compressor's piston and can reverse the motor at stoppage. To avoid this situation the motor must be stopped, when the gas is not pressurized, i.e., at the desired mechanical position, however motor is not equipped with a mechanical position sensor as the control system utilizes an electrical speed and position estimator. As a rule, it is impossible to estimate the mechanical position using an electrical position, however it has been noticed that at low speeds a detrimental feature of reciprocating compressors – varying load torque can help identify the mechanical position. Load torque impacts the quadrature current, making it oscillate at the mechanical frequency of the motor, so this mechanical frequency and position can be estimated using a Phased Locked Loop (PLL) algorithm, applied to the quadrature current.

Highlights

On the one hand, a quiet working and living environment is very important to people, with the rise of the spectrum and variety of available modern day home appliances and the increase in their power, noise pollution is becoming stronger and stronger
This paper describes the problems and solutions when a previously developed reciprocating compressor drive, which had been successfully put into Mass Production (MP), was found to be faulty
EXPERIMENTAL RESULTS Feasibility of the proposed method has been verified utilizing a standard compressor with Interior Permanent Magnet Synchronous Motor (IPMSM), which parameters are given in the Table I

Summary

Introduction

A quiet working and living environment is very important to people, with the rise of the spectrum and variety of available modern day home appliances and the increase in their power, noise pollution is becoming stronger and stronger. National standards of sound radiation are getting tougher and tougher For this reasons, manufactures of home appliances pay a lot of attention to the noise emissions of their devices and wage a war on every decibel [2]–[6]. This paper describes the problems and solutions when a previously developed reciprocating compressor drive, which had been successfully put into Mass Production (MP), was found to be faulty. This compressor drive has been used in refrigerators and air conditioners, all of which successfully passed all necessary certifications and had been put into MP. Due to the top placement of the compressor, its vibrations were amplified by the frame of

Methods

Results

Conclusion