Patents by Inventor Jan Car.o slashed.e Aarestrup

Jan Car.o slashed.e Aarestrup has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Motor/compressor combination having a control arrangement for starting the motor with asynchronous and then synchronous commutation
    Patent number: 5801500
    Abstract: A method for operating a motor/compressor combination, especially for hermetically-encapsulated small refrigerating machines, comprises a compressor having a periodically operating displacement element, which is driven by a brushless motor (3). To start the motor, it is subjected to asynchronous and then synchronous commutation of its stator windings (7,8,9). For starting, the rotor is turned by asynchronous commutation from any given rest position to a starting position that facilitates running-up and is then started from that starting position. A motor/compressor combination for carrying out that method has a control arrangement (10) which, in asynchronous commutation, enables the current-application patterns to succeed one another in such a manner that the rotor is turned from the rest position to the starting position and is started therefrom. In that manner, the motor/compressor combination can be started reliably even in the event of unfavourable conditions.
    Type: Grant
    Filed: March 18, 1996
    Date of Patent: September 1, 1998
    Assignee: Danfoss A/S
    Inventors: Finn Jensen, Jan Car.o slashed.e Aarestrup, Finn Visgaard Nielsen