Electricity: motive power systems – Synchronous motor systems – Brushless motor closed-loop control
Reexamination Certificate
2005-05-11
2011-11-15
Duda, Rina (Department: 2837)
Electricity: motive power systems
Synchronous motor systems
Brushless motor closed-loop control
C318S400320
Reexamination Certificate
active
08058825
ABSTRACT:
An electronically commutated motor (ECM) often employs a Hall sensor for reliable operation. Even when a Hall sensor is omitted from a motor having a plurality of stator winding phases (24, 26) and a permanent-magnet rotor (22), one can reliably detect direction of rotation of the rotor by the steps of: (a) differentiating a voltage profile obtained by sampling either (1) induced voltage in a presently currentless phase winding or (2) voltage drop at a transistor, through which current is flowing to a presently energized phase winding, and (b) using such a differentiated signal (du—24″/dt, du—26″/dt) to control current flow in an associated phase winding. In this manner, one obtains reliable commutation, even if the motor is spatially separated from its commutation electronics.
REFERENCES:
patent: 3614616 (1971-10-01), Bucek et al.
patent: 4119895 (1978-10-01), Müller
patent: 4460859 (1984-07-01), Remus et al.
patent: 4695782 (1987-09-01), Jatnieks
patent: 4874993 (1989-10-01), Tanaka
patent: 5194794 (1993-03-01), Shamoto
patent: 5280222 (1994-01-01), von der Heide
patent: 5343127 (1994-08-01), Maiocchi
patent: 5406185 (1995-04-01), Strunk
patent: 5545961 (1996-08-01), Peter et al.
patent: 5646491 (1997-07-01), Erdman et al.
patent: 6196650 (2001-03-01), Inagaki
patent: 6388416 (2002-05-01), Nakatani
patent: 6396226 (2002-05-01), Schmider et al.
patent: 6400107 (2002-06-01), Nakatani
patent: 6636013 (2003-10-01), Zeh
patent: 6895343 (2005-05-01), Jacobsen et al.
patent: 7132936 (2006-11-01), Norton
patent: 7429840 (2008-09-01), Pollock et al.
patent: 2002/0093305 (2002-07-01), Zeh
patent: 23 46 380 (1974-11-01), None
patent: 19820929 (1999-11-01), None
patent: 100 37 972 (2001-03-01), None
patent: 0 957 570 (2003-02-01), None
patent: 0 872 949 (2003-09-01), None
patent: 61-121 790 (1986-06-01), None
patent: 04-257 770 (1992-09-01), None
patent: WO 2004025822 (2004-03-01), None
Patent Abstracts of Japan, English abstract of JP 08-116 689-A, Inagaki/Sony, published May 7, 1996.
Patent Abstracts of Japan, English abstract of JP 07-143 790-A, Shimamura/Sanyo, publ. Jun. 2, 1995.
Duda Rina
EBM-Papst St. Georgen GmbH & Co. KG
Oliver Intellectual Property LLC
Oliver, Esq. Milton
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