Electricity: motive power systems – Constant motor current – load and/or torque control
Reexamination Certificate
2007-05-22
2010-10-26
Benson, Walter (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
C318S430000, C318S437000, C318S400010, C318S799000, C318S809000, C173S141000, C173S161000, C173S176000
Reexamination Certificate
active
07821217
ABSTRACT:
A power tool may include an electronically commutated motor such as, for example, a brushless DC permanent magnet motor with a rotor having internally mounted magnets and/or cavities filled with air or other non-magnetic materials. A control system may be used to control the motor in a manner that implements field weakening when the speed of the motor increases beyond its rated motor speed, or when the torque demands on the motor continue to increase after the maximum power output of the motor is reached. The field weakening may offset the growing back EMF and may enable a constant power and constant efficiency to be achieved by the motor over a wide speed range, rather than at just a single predetermined operating speed. Pulse width modulation control of the motor may be used up until the motor reaches its maximum power output.
REFERENCES:
patent: 4213356 (1980-07-01), Armitage
patent: 4950960 (1990-08-01), Krefta et al.
patent: 5177391 (1993-01-01), Kusase
patent: 5304882 (1994-04-01), Lipo et al.
patent: 5387061 (1995-02-01), Barkman et al.
patent: 5433007 (1995-07-01), Clark et al.
patent: 5455473 (1995-10-01), Lipo et al.
patent: 5463299 (1995-10-01), Futami et al.
patent: 5562528 (1996-10-01), Ueyama et al.
patent: 5631512 (1997-05-01), Kawabata et al.
patent: 5637968 (1997-06-01), Kainec et al.
patent: 5804939 (1998-09-01), Yamai et al.
patent: 5821710 (1998-10-01), Masuzawa et al.
patent: 5825112 (1998-10-01), Lipo et al.
patent: 6002234 (1999-12-01), Ohm et al.
patent: 6034458 (2000-03-01), Uetake et al.
patent: 6194852 (2001-02-01), Lovatt et al.
patent: 6320350 (2001-11-01), Take
patent: 6373211 (2002-04-01), Henry et al.
patent: 6508614 (2003-01-01), Ozaki et al.
patent: 6541877 (2003-04-01), Kim et al.
patent: 6605912 (2003-08-01), Bharadwaj et al.
patent: 6841911 (2005-01-01), Kim et al.
patent: 6897590 (2005-05-01), Popov
patent: 6927519 (2005-08-01), Popov
patent: 6967424 (2005-11-01), Popov
patent: 6987342 (2006-01-01), Hans
patent: 7064513 (2006-06-01), Fenley
patent: 7170243 (2007-01-01), Nakagawa et al.
patent: 7193378 (2007-03-01), Welchko
patent: 7194321 (2007-03-01), Sun et al.
patent: 7205738 (2007-04-01), Chapman et al.
patent: 7208908 (2007-04-01), Anghel
patent: 7268441 (2007-09-01), Asao et al.
patent: 7446582 (2008-11-01), Glatzmaier
patent: 2002/0047319 (2002-04-01), Ferrari et al.
patent: 2002/0116961 (2002-08-01), Kim et al.
patent: 2002/0117922 (2002-08-01), Kim et al.
patent: 2002/0117926 (2002-08-01), Joong et al.
patent: 2002/0117927 (2002-08-01), Kim et al.
patent: 2002/0117933 (2002-08-01), Joong et al.
patent: 2002/0158520 (2002-10-01), Takamune et al.
patent: 2005/0184689 (2005-08-01), Maslov et al.
patent: 1085644 (2000-08-01), None
patent: 2001-069609 (2001-03-01), None
patent: 2002-262487 (2002-09-01), None
patent: 2002-262488 (2002-09-01), None
patent: 2002-262489 (2002-09-01), None
patent: 2002-262493 (2002-09-01), None
patent: 2002-262494 (2002-09-01), None
patent: 2003-244874 (2003-08-01), None
Stephen J. Chapman, Electric Machinery Fundamentals, 1991, 1985, Mc-Graw-Hill, Inc, 2nd edition, pp. 661-663 & 697.
Abolhassani Mehdi
Deshpande Uday S.
Waikar Shailesh P.
Wang Ren H.
Benson Walter
Black & Decker Inc.
Harness & Dickey & Pierce P.L.C.
Paul Antony M
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