Patent ID: 9573486
Date: 2017-02-21
CPC Classifications: B60L,H02P,Y02T

Claim:
1. An electrical apparatus for powering an electrical machine with two different energy sources, comprising an electrical drive system having a battery and a super capacitor, and an electrical machine, wherein the electrical machine comprises a rotor, a first separate multi-phase stator winding and a second separate multi-phase stator winding, wherein the drive system comprises a first multi-phase bridge inverter connected to the first multi-phase stator winding and where the capacitor is connected between the high potential side and the low potential side of the first multi-phase bridge inverter, wherein the drive system comprises a second multi-phase bridge inverter connected to the second multi-phase stator winding and where the battery is connected between the high potential side and the low potential side of the second multi-phase bridge inverter, wherein the apparatus further comprises a switch adapted to connect and disconnect the first multi-phase bridge inverter to and from the second multi-phase bridge inverter, where the high potential side of the first multi-phase bridge inverter is connected and disconnected to the high potential side of the second multi-phase bridge inverter and the low potential side of the first multi-phase bridge inverter is connected and disconnected to the low potential side of the second multi-phase bridge inverter, where the switch is opened at a predefined operation state of the electrical apparatus; when the drive system powers the electrical machine, such that the electrical machine is powered from the battery by the second multi-phase bridge inverter through the second multi-phase stator winding and that the electrical machine is powered from the super capacitor by the first multi-phase bridge inverter through the first multi-phase stator winding, or: when the voltage of the super capacitor is lower than the voltage of the battery when the electrical machine is used for regenerative breaking, such that the regenerative braking energy charges the super capacitor to a voltage higher than the voltage of the battery, in order to reduce transient power that the battery has to deliver and receive.