Electricity: motive power systems – Limitation of motor load – current – torque or force
Reexamination Certificate
2006-05-09
2006-05-09
Martin, David (Department: 2837)
Electricity: motive power systems
Limitation of motor load, current, torque or force
C318S254100, C318S132000
Reexamination Certificate
active
07042182
ABSTRACT:
An electronically commutated motor (10) is adapted to be powered directly by an AC voltage (UAC) source, and comprises a permanent-magnet rotor (18), a stator having at least one winding phase (L1, L2, . . . , Ln), a rectifier (38) which generates, from the AC voltage (UAC), a pulsating DC voltage (UB) between a positive lead (30) and a negative lead (32) of a DC link (15). Also present is a bridge circuit (28A,28B,28C), connected to that DC link (15) and provided to supply current to the at least one winding phase (L1, L2, . . . , Ln), which comprises a switching element (50) controllable with a control voltage (UST) that is lower than the pulsating DC voltage (UB) to be switched. An auxiliary circuit (34, 34′) generates, from the pulsating DC voltage (UB) at the DC link and from the AC voltage (UAC), a control voltage (UST) for driving the switching element (50) that is lower than the pulsating DC voltage by an amount equal to a predetermined value (UΔ). A preferred filter (140) for connection to an AC power grid is described. A preferred embodiment of the circuit includes a bridge circuit having a p-channel MOSFET (50) at the positive lead (30) and an n-channel MOSFET (52) at the negative lead (32) of the DC link (15).
REFERENCES:
patent: 3740581 (1973-06-01), Pfiffner
patent: 5003246 (1991-03-01), Nadd
patent: 5610486 (1997-03-01), Li
patent: 5771166 (1998-06-01), Lim
patent: 5963024 (1999-10-01), Doemen
patent: 6008602 (1999-12-01), Karwath
patent: 6169378 (2001-01-01), Karwath
patent: 6452349 (2002-09-01), Hahn et al.
patent: 6825632 (2004-11-01), Hahn et al.
patent: 2003/0080696 (2003-05-01), Tang et al.
patent: 2004/0004404 (2004-01-01), Eckardt et al.
patent: 2005/0041443 (2005-02-01), Franke et al.
patent: 696 07 880 (1996-09-01), None
patent: WO 200250897 (2002-06-01), None
Sujit K. Biswas, Gate Drive Methods for IGBT's in Bridge Configurations, pp. 1310-1316©1994 IEEE document 0-7803-1993-Jan. 1994.
Lelkes et al., Single-phase External Rotor Synchronous Motor, 9thEuropean Conf. On Power Electronics and Applications, (Aug. 2001).
Fairchild Semiconductor, datasheet on FQD3P50, 500V, P-Channel QFET, copyright 2003.
Zetex Semiconductors, NPN High Voltage Transistors, 300 to 500 volts, FMMT 459, copyright 2003.
Hahn Alexander
Rappenecker Hermann
Schmid Harald
ebm-papst St. Georgen GmbH & Co. KG
Martin David
McCloud Renata
Oliver, Esq. Milton
Ware Fressola Van Der Sluys & Adolphson LLP
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