Electricity: motive power systems – Switched reluctance motor commutation control
Utility Patent
1998-11-17
2001-01-02
Masih, Karen (Department: 2837)
Electricity: motive power systems
Switched reluctance motor commutation control
C318S132000, C318S434000, C318S798000
Utility Patent
active
06169378
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to an arrangement with an electronically commutated motor, which during operation is supplied with a DC voltage of over 100 V from an AC main, via a rectifier connected to the mains and via a direct current (DC) link connected to this rectifier.
BACKGROUND
Since in arrangements of this kind, frequently no transformer is provided between the electronically commutated motor (ECM) and the AC mains, the ECM is not galvanically separated from the AC mains, and this requires special protective measures, in order to prevent danger to the user, in the event of possible insulation damage or the like.
SUMMARY OF THE INVENTION
An object of the invention, therefore, is to provide a new arrangement of the type mentioned at the beginning. This object is achieved, according to the invention, by means of an arrangement having an electronically commutated motor, which during operation is supplied with a DC voltage of over
100
V from an AC main via a rectifier connected to this main and via a DC link connected to this rectifier, having an arrangement that is supplied with current from this AC main via a transformer and is for supplying electronic elements of the motor with a DC voltage, and having a user interface provided for transmitting information to or from the motor (
16
), which interface is galvanically separated from the motor and is associated with a current supply that is galvanically separated from the motor, having a comparator device provided in the user interface, which is supplied with a fluctuating DC voltage that is generated by rectifying a mains-dependent AC voltage, said fluctuating DC voltage being compared in said comparator device with a predetermined signal, in order to generate a pulse-width-modulated (PWM) signal, whose duty ratio is defined by the predetermined signal, and further comprising a device for the galvanically separated transmission of this pulse width modulated signal from the user interface to the motor. The galvanic separation achieves the fact that the user interface is separated from the motor in terms of voltage and is therefore separated from the AC mains, so that any threat to the user or operator is reliably prevented, even in the event of malfunctions in, or damage to, the motor. The pulse width modulated signal can be transmitted to the motor without trouble, e.g. via an isolating transformer, an optical fiber, or an opto-coupler.
The invention makes it possible to supply the user interface with an analog signal for the desired speed, to convert this analog signal into digital signals with a signal-dependent duty ratio in a reasonably priced manner inside the user interface, and to transmit these digital signals with the aid of an opto-coupler to the control electronics of the motor, so that they can be further processed there.
In a particularly advantageous way, the transformer has an insulated winding chamber in which a separate low-voltage winding is provided, which is used for the galvanically separated current supply of the user interface. By virtue of the fact that this separate low-voltage winding is disposed in an insulated winding chamber, a galvanic separation is produced, which permits a test voltage of 4000 V, for example. It is not necessary to provide a separate isolating transformer for this purpose; rather, the same transformer can also be used for supplying the motor electronics with low voltage. The winding provided for this can be wound in a chamber with the primary winding and separate from the separate low-voltage winding mentioned above.
Another advantageous refinement of the invention involves the feature that the output voltage of the separate low voltage winding is adapted to be supplied to the user interface in the form of a rectified fluctuating DC voltage and in the form of a smoothed DC voltage. In a particularly simple manner, the fluctuating DC voltage permits a digitizing of analog signals that are supplied to the user interface, e.g., in order to determine the speed of the motor by means of such an analog signal.
Another preferred development of the invention is distinguished by the feature that at least one opto-coupler is provided for the galvanically separated transmission of signals to or from the user interface. The use of an opto-coupler automatically produces a galvanic separation. In this connection, in another development of the invention, the signals are preferably transmitted in digitized form by way of the at least one opto-coupler. In this manner, a reliable signal transmission is obtained, down to the frequency 0.
Other details and advantageous improvements of the invention result from the exemplary embodiments, which are described below, are represented in the drawings, and are in no way to be understood as a limitation of the invention.
REFERENCES:
patent: Re. 34609 (1994-05-01), Mueller et al.
patent: 3873897 (1975-03-01), Mueller et al.
patent: 4588933 (1986-05-01), Sun
patent: 4827196 (1989-05-01), Odell et al.
patent: 5220258 (1993-06-01), Hans et al.
patent: 5343129 (1994-08-01), Hans et al.
patent: 5537015 (1996-07-01), Karwath
patent: 5541484 (1996-07-01), DiTucci
patent: 5589745 (1996-12-01), Hans et al.
patent: 5598073 (1997-01-01), Hans et al.
patent: 5600216 (1997-02-01), Karwath et al.
patent: 5751128 (1998-05-01), Chalupa et al.
patent: 32 15 001 A1 (1983-10-01), None
patent: 41 05 162 A1 (1992-08-01), None
patent: 42 23 208 A1 (1994-01-01), None
patent: 42 22 092 A1 (1994-01-01), None
patent: 43 06 307 A1 (1994-09-01), None
patent: 43 05 767 A1 (1994-09-01), None
patent: 94 14 498-U1 (1995-02-01), None
patent: 43 44 448-A1 (1995-06-01), None
patent: 0 318 938 A2 (1989-06-01), None
patent: 0 467 085 A1 (1992-01-01), None
patent: 0 643 473-B1 (1998-04-01), None
WPI English Abstract of Krause/Lehmann DE 32 15 001-A1 of Oct. 27, '83.
WPI English abstract of Hans+Moini/Papst DE 40 19 338 (Dec. 19, '91) & EP 0 467 085-A1 (Jan. 22, '92).
WPI English Abstract of Kennel/Bosch DE 41 05 162-A1 of Aug. 27, '92.
WPI English Abstract of Heinz+/Miele DE 42 22 092-A1 of Jun. 29, '95.
WPI English abstract of Karwath+Moini/Papst DE 42 23 208-A1 of Jan. 20, '94.
WPI English Abstract of Rottmerhusen DE 43 05 767-A1 of Sep. 01, '94.
WPI English Abstract of Hoenes+Raisch/Kautt & Bux KG DE 43 44 448-A1 of Jun. 29, '95.
WPI English Abstract of Lory, Huegel & Kuenzel/Siemens DE 43 06 307-A, of Sep. 08, '94.
WPI English Abstract of Karwath/Papst, EP 0 643 473-B1 of Mar. 15, '95 (repub. Apr. 29, '98).
Masih Karen
Oliver Milton
Papst Motoren GmbH & Co. KG
Ware Fressola Van der Sluys & Adolphson LLP
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