(54) ELECTRIC MOTOR MOVEMENT
CONTROLLING METHOD, AN ELECTRIC
MOTOR MOVEMENT CONTROLLING
SYSTEM AND A COMPRESSOR
(75) Inventor: Paulo Sergio Dainez, Joinville (BR)
(73) Assignee: Empresa Brasileira de Compressores S.A. - Embraco, Joinville-SC (BR)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 10/564,581
(22) PCT Filed: Jul. 14, 2004
(86) PCT No.: PCT/BR2004/000114
§ 371 (c)(1),
(2), (4) Date: Jun. 9, 2006
(87) PCT Pub. No.: WO2005/006537 PCT Pub. Date: Jan. 20, 2005
(65) Prior Publication Data
US 2007/0001630 Al Jan. 4, 2007
(30) Foreign Application Priority Data
Jul. 15, 2003 (BR) 0302419
(51) Int. CI.
G0SB 11/36 (2006.01)
(52) U.S. CI 318/609; 318/632; 318/254;
(58) Field of Classification Search 318/254,
318/138, 439, 500, 432, 632, 109, 609, 610 See application file for complete search history.
The present invention provides an electric motor movement controlling method, where the electric motor is fed by a total voltage proportional to the network voltage. The method comprises steps of making a first measurement of level of the network voltage at a first moment of measurement and making a second measurement of level of the network voltage; at a second moment of measurement, calculating the value of the derivative of the values of voltage measured in function of the first and second moments of measurement, to obtain a value of a proportional network voltage, and altering the value of the total voltage fed to the motor, proportionally to the value of the proportional network. A system that will implement the steps of the method of the present invention, as well as a compressor comprising the system of the present invention are foreseen.
26 Claims, 5 Drawing Sheets