In order to store excess kinetic energy, an energy storage device and an operating method are described, in which the kinetic energy can be partially converted into electrical energy by a first electric machine using at least two electric machines arranged on a shaft and can be partially converted i
In order to store excess kinetic energy, an energy storage device and an operating method are described, in which the kinetic energy can be partially converted into electrical energy by a first electric machine using at least two electric machines arranged on a shaft and can be partially converted into additional kinetic energy, such as rotational energy, by a second electric machine. The method for energy storage of excess kinetic energy provides for converting kinetic energy partially into electric energy and partially into additional kinetic energy, such as rotational energy.
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1. An energy storage device to store excess kinetic energy from a rotating shaft, comprising: a first electrical machine arranged on the shaft to convert a first portion of the kinetic energy into electrical energy; anda second electrical machine arranged on the shaft to transfer a second portion of
1. An energy storage device to store excess kinetic energy from a rotating shaft, comprising: a first electrical machine arranged on the shaft to convert a first portion of the kinetic energy into electrical energy; anda second electrical machine arranged on the shaft to transfer a second portion of the kinetic energy from the shaft into a different form of kinetic energy, the second electrical machine including a rotating stator that is connected to the rotating shaft and that rotates at an angular velocity equal to that of the shaft and a flywheel running radially outward from the rotating stator and rotating relative to the rotating stator,wherein there is an approximately 1:1 ratio between the first portion of the kinetic energy and the second portion of the kinetic energy. 2. The energy storage device as claimed in claim 1, wherein the first electrical machine is a generator to convert the first portion of the kinetic energy into electrical energy, and provide charging current to a battery or high-performance capacitor, andthe second electrical machine is a flywheel storage system to transfer the second portion of the kinetic energy from the shaft into rotational kinetic energy of a flywheel. 3. The energy storage device as claimed in claim 2, wherein the second electrical machine comprises: a rotating stator which is fastened to the shaft and rotates at an angular velocity equal to that of the shaft; anda flywheel running radially outward from the rotating stator. 4. The energy storage device as claimed in claim 3, wherein the first electrical machine comprises: a stationary stator which is stationary; anda rotor which is connected to the shaft and rotates at an angular velocity equal to that of the shaft. 5. The energy storage device as claimed in claim 4, wherein in a first operating condition, the first electrical machine converts the first portion of the kinetic energy into electrical energy, andin a second operating condition, the first electrical machine serves as a drive motor to drive the shaft. 6. The energy storage device as claimed in claim 5, wherein there is an approximately 1:1 ratio between the first portion of the kinetic energy and the second portion of the kinetic energy. 7. The energy storage device as claimed in claim 1, wherein the first electrical machine comprises: a stationary stator which is stationary; anda rotor which is connected to the shaft and rotates at an angular velocity equal to that of the shaft. 8. The energy storage device as claimed in claim 1, wherein in a first operating condition, the first electrical machine converts the first portion of the kinetic energy into electrical energy, andin a second operating condition, the first electrical machine serves as a drive motor to drive the shaft. 9. A method for storing excess kinetic energy from a rotating shaft, comprising: converting a first portion of the kinetic energy into electrical energy, using a first electrical machine; andconverting a second portion of the kinetic energy, using a second electrical machine, into a different form of kinetic energy, the second electrical machine including a rotating stator that is connected to the rotating shaft and that rotates at an angular velocity equal to that of the shaft and a flywheel running radially outward from the rotating stator and rotating relative to the rotating stator,wherein there is an approximately 1:1 ratio between first portion of the kinetic energy and the second portion of the kinetic energy. 10. The method as claimed in claim 9, wherein the first electrical machine is operated as a generator, andthe second electrical machine is operated as a flywheel storage system. 11. The method as claimed in claim 9, wherein there is an approximately 1:1 ratio between first portion of the kinetic energy and the second portion of the kinetic energy.
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