Dual-motor unit for a flywheel energy storage system with a nonlinear overall power characteristic curve
AssigneeAdaptive Balancing Power GmbH
InventorsHendrik Schaede-Bodenschatz, Nicolai Meder, Mario Carroccia
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Abstract
Disclosed is a dual motor unit for a flywheel mass accumulator, with at least two electric machines coupled to a common rotary body; wherein the electric machines have different power characteristics and the dual motor unit is adapted to provide a total operating power in an operating speed range (Ω) by an interaction of the electric machines. The power characteristic (Pmax) is non-linearly dependent on a rotational speed (ω) of the common rotary body.
Claims16
A dual motor unit for a flywheel mass accumulator which serves to store electrical energy by a rotating flywheel mass, with at least two electric machines directly coupled to a common rotary body, the rotary body being part of the flywheel mass or the flywheel mass being part of the rotary body;
- wherein
- the electric machines each have power characteristics different from one another;
- and
- the dual motor unit is designed to provide a total operating power in an operating speed range (Ω) by an interaction of the electric machines, wherein the total operating power is determined by a total power characteristic (Pmax) resulting from the different power characteristics of the electric machines, and the total power characteristic (Pmax) is non-linearly dependent on a rotational speed (ω) of the common rotary body;
- and the operating speed range (Ω) is predetermined by a minimum speed (ωmin) greater than zero and a maximum speed (ωmax) greater than the minimum speed (ωmin) and comprises more than 30% of a total speed range of the dual motor unit.
A method for controlling a dual-motor unit in a flywheel mass accumulator which serves to store electrical energy by a rotating flywheel mass, the dual-motor unit having a common rotary body coupled to a flywheel mass of the flywheel mass accumulator or a common rotary body comprising the flywheel mass, and having at least two electric machines directly coupled to the common rotary body, and the electric machines each having mutually different power characteristics (Pa, Pb) with operating the electric machines during ongoing operation of the dual motor unit in accordance with respective individual power specifications in an operating speed range (ω) in such a way that the electric machines in interaction produce a total operating power which is predetermined by a total power characteristic (Pmax) resulting from the different power characteristics (Pa, Pb) of the electric machines (3a, 3b) and which is non-linearly dependent on a rotational speed (ω) of the common rotary body;
- wherein the operating speed range (ω) is predetermined by a minimum speed (ωmin) greater than zero and a maximum speed (ωmax) greater than the minimum speed (ωmin) and comprises more than 30% of a total speed range of the dual motor unit.
Dependencies are inferred from the claim text.