Utilization of rotor kinetic energy storage for hybrid vehicles
First Claim
1. A power system for a motor vehicle having an internal combustion engine, the power system comprising:
- an electric machine comprising;
a first excitation source having coils for receiving ac electrical power to provide a magnetic field;
a permanent magnet rotor spaced from the stator to define a first air gap relative to the permanent magnet rotor;
a magnetic coupling rotor spaced from the permanent magnet rotor to define a second air gap relative to the permanent magnet rotor; and
at least one secondary excitation source spaced from the magnetic coupling rotor by a third air gap to provide slip-energy excitation to the magnetic coupling rotor; and
wherein the magnetic coupling rotor also includes a flywheel having an inertial mass to store kinetic energy during an initial acceleration of the permanent magnet rotor to an operating speed; and
wherein the first excitation source is electrically connected to the second excitation source for power cycling such that the flywheel rotor exerts torque on the permanent magnet rotor to assist braking and acceleration of the permanent magnet rotor.
2 Assignments
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Accused Products
Abstract
A power system for a motor vehicle having an internal combustion engine, the power system comprises an electric machine (12) further comprising a first excitation source (47), a permanent magnet rotor (28) and a magnetic coupling rotor (26) spaced from the permanent magnet rotor and at least one second excitation source (43), the magnetic coupling rotor (26) also including a flywheel having an inertial mass to store kinetic energy during an initial acceleration to an operating speed; and wherein the first excitation source is electrically connected to the second excitation source for power cycling such that the flywheel rotor (26) exerts torque on the permanent magnet rotor (28) to assist braking and acceleration of the permanent magnet rotor (28) and consequently, the vehicle. An axial gap machine and a radial gap machine are disclosed and methods of the invention are also disclosed.
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Citations
8 Claims
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1. A power system for a motor vehicle having an internal combustion engine, the power system comprising:
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an electric machine comprising; a first excitation source having coils for receiving ac electrical power to provide a magnetic field; a permanent magnet rotor spaced from the stator to define a first air gap relative to the permanent magnet rotor; a magnetic coupling rotor spaced from the permanent magnet rotor to define a second air gap relative to the permanent magnet rotor; and at least one secondary excitation source spaced from the magnetic coupling rotor by a third air gap to provide slip-energy excitation to the magnetic coupling rotor; and wherein the magnetic coupling rotor also includes a flywheel having an inertial mass to store kinetic energy during an initial acceleration of the permanent magnet rotor to an operating speed; and wherein the first excitation source is electrically connected to the second excitation source for power cycling such that the flywheel rotor exerts torque on the permanent magnet rotor to assist braking and acceleration of the permanent magnet rotor. - View Dependent Claims (2, 3, 4, 5)
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6. A method for improving efficiency in a hybrid vehicle, comprising:
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accelerating a permanent rotor from a first excitation source providing multiphase excitation; providing slip energy excitation to a flywheel rotor from a second excitation source; storing kinetic energy in a flywheel rotor during acceleration of the permanent magnet rotor in which there is magnetic coupling between the flywheel rotor and the permanent magnet rotor; and operating the first excitation source and the permanent magnet rotor as a generator and returning power through the second excitation source to the flywheel rotor to slow down the permanent magnet rotor. - View Dependent Claims (7, 8)
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Specification