An electric drive device, wherein the electric drive comprises: - a battery , - an open-winding motor , and - at least a first three-phase inverter and a second three-phase inverter each connected to a different side of the open-winding motor , - three alternating current sensors provided between the one of the three-phase inverters and the open-winding motor to detect alternating currents of respective phases, - a first P bus connecting wire , a second P bus connecting wire , a first N bus connecting wire and a second N bus connecting wire , which are partly arranged in proximity to each other, and - a direct-current sensor to detect collectively currents (IdL1 and IdL2, IdR1 and IdR2) flowing to the first P bus connecting wire and the first N bus connecting wire or to the second P bus connecting wire and the second N bus connecting wire , - a diagnosis unit that diagnoses a failure of the direct-current sensor when the sum of currents measured by the direct-current sensor and the currents measured by the alternating-current sensors is above a certain threshold, wherein the direct-current sensor detects direct currents supplied to the first three-phase inverter or the second three-phase inverter for driving the open-winding motor , wherein the battery is connected to the first three-phase inverter via the first P bus connecting wire and the first N bus connecting wire , and to the second three-phase inverter via the second P bus connecting wire and the second N bus connecting wire , and the direct-current sensor has a core surrounding the first P bus connecting wire and the first N bus connecting wire or the second P bus connecting wire and the second N bus connecting wire . - a battery , - an open-winding motor , and - at least a first three-phase inverter and a second three-phase inverter each connected to a different side of the open-winding motor , - three alternating current sensors provided between the one of the three-phase inverters and the open-winding motor to detect alternating currents of respective phases, - a first P bus connecting wire , a second P bus connecting wire , a first N bus connecting wire and a second N bus connecting wire , which are partly arranged in proximity to each other, and - a direct-current sensor to detect collectively currents (IdL1 and IdL2, IdR1 and IdR2) flowing to the first P bus connecting wire and the first N bus connecting wire or to the second P bus connecting wire and the second N bus connecting wire , - a diagnosis unit that diagnoses a failure of the direct-current sensor when the sum of currents measured by the direct-current sensor and the currents measured by the alternating-current sensors is above a certain threshold, wherein the direct-current sensor detects direct currents supplied to the first three-phase inverter or the second three-phase inverter for driving the open-winding motor , wherein the battery is connected to the first three-phase inverter via the first P bus connecting wire and the first N bus connecting wire , and to the second three-phase inverter via the second P bus connecting wire and the second N bus connecting wire , and the direct-current sensor has a core surrounding the first P bus connecting wire and the first N bus connecting wire or the second P bus connecting wire and the second N bus connecting wire . wherein the battery is connected to the first three-phase inverter via the first P bus connecting wire and the first N bus connecting wire , and to the second three-phase inverter via the second P bus connecting wire and the second N bus connecting wire , and the direct-current sensor has a core surrounding the first P bus connecting wire and the first N bus connecting wire or the second P bus connecting wire and the second N bus connecting wire . <EOS>