Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-12-20
2004-07-27
Le, Dang (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S112000, C310S266000
Reexamination Certificate
active
06768237
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an electric motor system, preferably of the three-phase current design.
2. Discussion of Background Information
Electric motors are being used more and more in automotive engineering. Systems that handle the power exchange on the machine voltage level are known, such as the ISAD system (integrated starter-alternator-damper system).
Furthermore, electrically operated turbochargers are known, in which the power exchange also takes place on the machine voltage level. Thereby, the turbocharger capacity is derived entirely from the machine's mains.
SUMMARY OF THE INVENTION
The aim of this invention is to create an electric motor system that can be used especially in automotive engineering environment, and that provides sufficient electric power or different levels of voltage for the supply of two different mains, especially for a turbocharger.
The electric motor system according to this invention is characterized by the fact that a first electric motor is provided, which is mechanically connected via the rotor thereof to a rotating shaft of an engine, especially of an internal combustion engine, that in addition, at least one second electric motor is provided, that the second electric motor is mechanically coupled via the rotor thereof to a rotating part of a mechanical aggregate, especially to a turbo-engine, and that the first electric motor is electrically coupled to at least the second electric motor in order to exchange electric power at a freely selectable voltage level. With this invention, it is possible for the first time to create a separate, autarkic, internal electric circuit or component that is independent from the voltage level of the machine's mains. With this, the motor according to the invention and the electronic power circuits can be designed with optimal operating voltages. It is also known that it is usually more advantageous to transport electric power at higher voltages than those currently common in the machine's mains.
This internal electrical circuit or component is connected with the first motor through electronic power components such as diodes and transistors and via circuits in accordance with the state of the art, in order to design the internal electrical component in terms of its electric ratios, such as voltages and currents and their time curves.
The first motor can supply and discharge mechanical torque via the combustion engine, so that the first motor can work as a generator when power is consumed, and it discharges this energy to the internal electrical part in the form of electric power. If the first motor draws electric power from the internal electric part, it works as a motor and can use this torque e.g. to start the combustion engine or to support or optimize its operation.
In a special feature of the invention, the first electric motor is mechanically connected via the rotor thereof to a rotating shaft or to the shaft of a combustion engine mechanically connected to the rotating shaft. As a result, the mechanical torque between the first electric motor and the combustion engine can easily be exchanged.
In accordance with one embodiment of the invention, the first electric motor is mechanically connected to the combustion engine via a gearbox. This design solution also improves the torque at low revs in an electrically driven turbocharger.
In accordance with another embodiment of the invention, the first electric motor is a part of the combustion engine, e.g. the rotor in the first electric motor is integrated in the flywheel of the combustion engine. The advantage of this design solution lies mainly in the fact that the entire arrangement can be produced in a relatively compact manner.
In accordance with a special feature of the invention, the first electric motor is connected to at least one external electric circuit, preferably a machine's mains. This second electric coupling is connected to the machine's mains via an electronic voltage adjustment circuit in accordance with the state of the art. As a result, power can be exchanged between the internal electric part and the machine's mains. Thus, the first electric motor in accordance with the invention can be operated as a starter in one power direction and as a machine's mains charging device in the other direction.
In accordance with a further embodiment of the invention, the first and second electric motors are mounted in a casing. With this embodiment, it is possible to produce an electric drive system that can be manufactured and used economically. The advantage of this invention is the fact that, unlike the known electromagnetic drives or purely mechanical drives, such as gears in which two different, usually independent speeds are required, major parts such as the casing elements, parts of the controls, can be spared. In addition, the well-known local EMC problems in the casing can be solved and do not penetrate into the surroundings.
In accordance with a further embodiment of the invention, the first and/or second electric motor(s) is/are designed as asynchronous, synchronous or reluctance motor. Thus, the optimal motor can be chosen for each individual application.
In accordance with a further feature of the invention, the first and second electric motors have rotors with the same axis of rotation. Especially in automotive engineering it is an advantage if there is only one axis of rotation for a mechanic-electric-mechanic coupling.
In accordance with a special embodiment of the invention, one of the two motors is designed as an inner rotor and the other motor as an outer rotor. This embodiment of the invention also allows a compact motor design.
In accordance with a further feature of the invention, the two electric motors have one mutual stator plate package. In this embodiment, a stator with at least one stator coil and at least two rotors can be provided in one casing. The rotors are mechanically separated, and each rotor has electromagnetic interaction with the electromagnetically active stator, whereby the rotor speeds may be the same or different.
In accordance with a further embodiment of the invention, the components for electric power exchange between the electric motors and/or an external electric circuit are mounted in the casing of at least one electric motor. This embodiment serves primarily to create a compact electric motor for automotive engineering environment.
In a further embodiment of the invention, the casing of at least one electric motor has a liquid cooling system. As a result, the frictional heat of the coils and also of the electronic power elements, which may occur due to the known problems with the high currents in the motor, can be discharged optimally.
In accordance with another feature of the invention, a mains connection with direct, alternating or three-phase current can be derived from the electric circuit connecting the two electric motors. In this embodiment, an additional three-phase, alternating or direct current network can be provided by the internal electric circuit. For example, a strong 230 V supply or 3×400 V supply can be decoupled, whereby the frequency can be specified either internally or externally. Thus, the machine's mains and the aggregates connected to it are connected to this supply in terms of power via the internal electric circuit.
As a result, the combustion engine can be started from the power supply without requiring the machine's mains, for example, or vice versa the combustion engine can support or charge an existing supply. It is also possible to charge the machine's mains battery from the supply in a simple manner.
In accordance with a special feature of the invention, the stator of at least one electric motor has at least two winding systems, preferably separated galvanically within the motor, which are mechanically coupled with the motor's main current. With this embodiment of the invention, it is possible to create two autarkic electric circuits with independent voltage
Greenblum & Bernstein P.L.C.
Le Dang
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