| Danfoss Drives A/S Patent applications |
| Patent application number | Title | Published |
|---|
| 20120127763 | ELECTRIC POWER SUPPLY SYSTEM COMPRISING POWER MODULES COUPLED IN PARALLEL - The present invention relates to an electric power supply system comprising at least two power modules coupled in parallel and comprising a first power module comprising a first control means adapted to control the operation of at least the first power module, and a second power module comprising a second control means adapted to control the operation of at least the second power module and wherein the power modules are configured to operate in a manner coordinated with other power modules, the operation of each power module including switching the power module on and/or off if demand so requires. The present invention further relates to a method for carrying out the present invention. | 05-24-2012 |
| 20120098471 | ELECTRICAL SYSTEM AND METHOD FOR CONTROLLING AN ELECTRICAL MOTOR - An electrical system comprising an electrical motor and a method for controlling the electrical motor. The system comprises the electrical motor, a power source connection, a first motor control device placed between the power source connection and the motor, and a second motor control device placed in parallel with the first motor control device, the first motor control device supplying electrical power to the motor at least one first operating condition of the motor, and the second motor control device supplying electrical power to the motor at least one second operating condition of the motor, wherein the at least one first operating condition differs from the at least one second operating condition of the motor. | 04-26-2012 |
| 20110249368 | METHOD FOR DETECTING EARTH-FAULT CONDITIONS IN A MOTOR CONTROLLER - The present invention relates to a method for determining the existence of an earth-fault on-the-fly and thereby protecting a motor controller having a high- and a low-side DC-link, and having high- and low-side switching elements, the high- and low-side switching elements being operatively connected to the high- and low-side DC-link buses, respectively, the method comprising the steps of generating a fault signal, generating at least one test vector in response to the fault signal by switching at least one of the switching elements on, and measuring, while the at least one switching element is on, the magnitude of a current flowing in that DC-link operatively connected to the conducting switching element in order to detect an earth-fault. The present invention further relates to additional methods for on-the-fly determination of earth-faults. | 10-13-2011 |
| 20110025371 | METHOD FOR DETECTING A FAULT IN AN INDUCTION MACHINE - The invention concerns a method for detecting a fault in a rotating field machine, in which current components are analysed in a flux-based, particularly rotor-flux-based, coordinate system a flux-forming current component being subjected to a frequency analysis in the flux-based, particularly rotor-flux-based, coordinate system. It is endeavoured to provide a simple method for an early detection of faults. For this purpose, a current operating point is detected for at least one predetermined supply frequency (f | 02-03-2011 |
| 20100270964 | METHOD FOR DRIVING A PULSE WIDTH MODULATED CONTROLLER - The present invention relates to a method for generating an electric control signal for controlling one or more switching elements of an inverter for driving an electric machine, such as a motor, the method comprising the steps of providing an electric control signal comprising a control frequency and a corresponding control period, dividing a first control period of said electric control signal into a plurality of switching periods, and providing a first switching PWM pulse within a first switching period of a first control period, and providing a second switching PWM pulse within a second switching period of said first control period, wherein the first switching PWM pulse is a minimum-filtered PWM pulse, and wherein the second switching PWM pulse is a corrected PWM pulse. The present invention further relates to an electronic control signal provided according to the before-mentioned method, and to an electronic control system for providing the before-mentioned method. | 10-28-2010 |
| 20100195284 | ELECTRONIC DEVICE AND FREQUENCY CONVERTER OF MOTOR - The present invention provides an electronic device, comprising: a circuit board having at least one first heat-generating element and at least one second heat-generating element mounted thereon; a heat sink connected to said at least one first heat-generating element; a fan facing said heat sink; and an airflow guiding member placed between said fan and said heat sink for guiding the cooling air from said fan to said heat sink and said at least one second heat-generating element respectively. Said electronic device may further comprise a separating member for separating a main body of said at least one second heat-generating element from said circuit board, so as to prevent the cooling air guided to said at least one second heat-generating element from flowing to said circuit board; a bracket for separating said at least one first heat-generating element from other elements on said circuit board, so as to thermally insulate between them; and a flow-guiding gate guiding the airflow from said fan, and dispensing more airflow flow through the region on the heat sink corresponding to at least one first heat-generating element. | 08-05-2010 |
| 20100181057 | FLOW DISTRIBUTOR ASSEMBLY AND A COOLING UNIT WITH A FLOW DISTRIBUTOR ASSEMBLY - A flow distributor assembly ( | 07-22-2010 |
