Joern Poulsen: Motor controller incorporating an electronic circuit for protection against inrush currents. Danfoss Drives, McCormick Paulding & Huber, May 23, 2006: US07050278 (75 worldwide citation)

Inrush currents in the dc intermediate circuit of a motor controller necessitate the incorporation of protection circuits. These circuits usually take the form of a resistor inserted in series with the intermediate circuit, and the resistor is short-circuited after completion of inrush by a switch p ...

Kenneth Skaug, Michael Toennes, Nils Ole Harvest, Egon Krogh, Andreas Aupke: Frequency converter for different mains voltages. Danfoss Drives, McCormick Paulding & Huber, May 22, 2007: US07221121 (68 worldwide citation)

The invention is directed to controlling an electric motor by means of a frequency converter. The frequency converter can be connected to one of several different mains voltages. According to the present invention, the maximum output power of the frequency converter, is limited when the actual mains ...


Eik Sefeldt Møller: Method for regulating a delivery variable of a pump. Danfoss Drives, Lee Mann Smith McWilliams Sweeney & Ohlson, October 22, 2002: US06468042 (66 worldwide citation)

In a known method for regulating a delivery variable of a pump, which is driven by an electric motor operated with alternating current of variable frequency, especially via a converter, the input power of the motor is measured as the actual value for the delivery variable and is regulated by compari ...

Ole Mathiassen: Electric motor. Danfoss Drives, Barnes & Thornburg, April 6, 2004: US06717318 (65 worldwide citation)

The invention concerns an electric motor with a stator, in whose bore a rotor is arranged, and with a control arrangement having at least one coil with a core passed by the motor current. The coil shall be arranged in a space saving manner without interfering too much with the magnetic field of the ...


Jesper Soebygaard Nielsen, Lars Kappel: Cooling apparatus for power semiconductors. Danfoss Drives, Altera Law Group, December 10, 2002: US06493227 (54 worldwide citation)

A cooling apparatus for power semiconductors, which apparatus is essentially box-shaped, has two extruded cooling sections (

Henry Møller: RFI filter for a frequency converter. Danfoss Drives, McCormick Paulding & Huber, February 10, 2004: US06690250 (52 worldwide citation)

The invention relates to an RFI filter used for avoidance of mains retro-action in the form of radio noise. RFI filters are connected to frequency converters in order to reduce radio noise transmitted via conductors. These filters comprise large noise-decoupling capacitors which are connected to ear ...

Claus Thybo: Method for monitoring a rotational angle sensor on an electrical machine. Danfoss Drives, Lee Mann Smith McWilliams Sweeney & Ohlson, July 30, 2002: US06426633 (51 worldwide citation)

A method for monitoring a rotational angle sensor on an electrical machine. It is desired to provide a method that enables fault detection at both high speeds and low speeds of the rotor. The electrical power of the machine is measured and a power value is estimated using the output signal of the ro ...

Schmidt Steffen Haslund: A cover for a push button switch. Danfoss Drives, Schmidt Steffen Haslund, NISSEN Georg, October 14, 2004: WO/2004/088694 (47 worldwide citation)

A cover and a method of making a cover for a push button switch. A frame and a key for switching the push button switch are moulded directly onto a flexible layer forming an outer surface of the cover. The flexible layer shields the key and the associated push button switch from dust and water and t ...