Turbine-type flow rate controlling device

Patent metadata

Field	Value
Publication number	US-2016290153-A1
Application number	US-201615086142-A
Country	US
Kind code	A1
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	Oct 6, 2016
Grant date	—

Abstract

A power generating portion formed of a rotor and a stator is provided. The rotor is formed of a ring incorporating a permanent magnet and an impeller. The rotor is regarded as a turbine. An actual flow rate is estimated from a present angular velocity of the turbine and a present torque of the power generating portion, a torque of the power generating portion in which the estimated actual flow rate corresponds to a setting flow rate is calculated and the torque of the power generating portion is controlled based on the calculated torque and a magnetic pole position of the turbine. A measured value detected by a position sensor is used as the magnetic pole position of the turbine, however, when it is determined that reliability does not exist in the position sensor, an estimated value is used.

First claim

What is claimed:

1 . A turbine-type flow rate controlling device comprising:
a turbine converting energy of a fluid flowing in a flow path into rotational movement energy; a power generator converting the rotational movement energy converted by the turbine into electrical energy; a setting flow rate input inputting a setting flow rate values of which vary due to load fluctuation of a supply destination of the fluid; a flow rate controller estimating an actual flow rate of the fluid flowing in the flow path from a present angular velocity of the turbine and a present torque of the power generator and calculating a torque of the power generator in which the estimated actual flow rate corresponds to the setting flow rate; a position sensor detecting a position of a magnetic pole of a magnet incorporated in the turbine as a magnetic pole position of the turbine; a magnetic pole position estimator estimating the position of the magnetic pole of the magnet incorporated in the turbine as the magnetic pole position of the turbine; a magnetic pole position selector selecting any one of the magnetic pole position of the turbine detected by the position sensor and the magnetic pole position of the turbine estimated by the magnetic pole position estimator; and a power generating controller controlling the torque of the power generator based on the torque calculated by the flow rate controller and the magnetic pole position of the turbine selected by the magnetic pole position selector.

2 . The turbine-type flow rate controlling device according to claim 1 ,
wherein the magnetic pole position estimator estimates the magnetic pole position of the turbine based on a present phase voltage value and a present phase current value of the power generator and a present temperature of winding of the power generator.

3 . The turbine-type flow rate controlling device according to claim 1 ,
wherein the magnetic pole position selector determines existence of reliability in the magnetic pole position of the turbine detected by the position sensor, selecting the magnetic pole position of the turbine detected by the position sensor when the reliability exists, and selecting the magnetic pole position of the turbine estimated by the magnetic pole position estimator when the reliability does not exist.

4 . The turbine-type flow rate controlling device according to claim 1 , further comprising:
an inverter inputting a phase voltage setting value from the power generating controller, outputting a phase voltage to the power generator and outputting a present phase voltage value and a present phase current value of the power generator respectively to the power generating controller and the magnetic pole position estimator.

Assignees

• Azbil Corp

Inventors

• Narita Hiroaki
• Saruwatari Makoto

Classifications

• F05B2270/101

  to control rotational speed (n) · CPC title

• F01D15/005

  Adaptations for refrigeration plants · CPC title

• H02K7/1823

  structurally associated with turbines or similar engines · CPC title

• F05B2220/706

  an electrical generator · CPC title

• F03B17/06

  using liquid flow {with predominantly kinetic energy conversion}, e.g. of swinging-flap type {, "run-of-river", "ultra-low head" (F03B13/264 takes precedence)} · CPC title