CZ31677U1 - An electromechanical backup power source and an electric power stabilizer - Google Patents

Description

Technical field

The technical solution concerns the possibility of accumulation of electric energy in the form of mechanical in rotating mass and its subsequent use both in the case of a short-term power outage in the distribution network (back-up source) and also to stabilize the voltage during its fluctuation.

BACKGROUND OF THE INVENTION

The principle of energy storage in a rotating mass is well known in the past. For centuries, the flywheel has been used to achieve a smooth running of rotating mechanisms. In the original purely mechanical drives, the flywheel functioned as a heavy stone rotating wheel. An example is the potter's wheel. In the 19th century, the flywheel helped accumulate kinetic energy to overcome the deadlocks of the steam engine crank mechanism.

At present, the flywheel is an integral part of any internal combustion engine, where it compensates for uneven running. Unlike the initial very simple designs, flywheels nowadays have a much more advanced design and function, making flywheels now also useful as short-term energy storage, which can then be reused. One possible future application of such a device is a back-up power source and stabilizer in homes or businesses.

The essence of the technical solution

Technological advances in materials, magnetic bearings, power electronics or even the availability of powerful neodymium magnets make it possible for the electromechanical accumulator to find greater use. An electromechanical energy storage device can be used, for example, as a backup power source in households or businesses in the event of a short-term power outage. These failures (micro-failures) can in some cases cause considerable damage if production and specific technological process (production of nanofibres, 3D printing, etc.) are stopped. The device can eliminate these short-term outages. At the same time, the device makes it possible to stabilize the mains voltage, as it can compensate for partial voltage fluctuations. This may ultimately have a positive effect on the overall electricity consumption. The issue of voltage fluctuations in the grid and the necessity of its stabilization is also current due to new sources such as photovoltaic or wind power plants.

Since the stored energy is proportional to the square of the velocity and only linearly proportional to the mass, a high speed of rotation of the flywheel is necessary for the accumulation of large amounts of energy. The suitability of using a flywheel for energy storage results from the basic characteristics of the flywheel, which are high power density, capacity independent of the depth of discharge and the number of charging cycles, easy measurability of the charge state given by the angular speed of the flywheel, very short charging time and minimal maintenance during traffic

The proposed technical solution consists of a high-speed asynchronous electric motor 1, a splined rotor shaft 2, on which a flywheel, consisting of a disc part 3 and a flywheel main ring 4, a radial neodymium magnet assembly 5, axial neodymium magnet assembly 6, motherboard with power electronics 7, a protective sleeve 8, a power cable 9 and an information display 10 which forms the interface of the electromechanical accumulator itself.

- 1 GB 31677 U1

Depending on the application, the device can be designed, for example, for use in the 230 V 50 Hz or 400 V 50 Hz network, or other parameters. The device can also be equipped with a hermetic separation of the flywheel from the high-speed engine in order to reduce the air pressure and thus losses during the rotation of the flywheel.

Clarification of drawings

Figure 1 shows a schematic representation of the main components of an electromechanical accumulator.

Examples of technical solutions

The assembly of axial neodymium magnets 6 and the asynchronous electric motor 1 in the vertical position are firmly fixed to the base plate with the power electronics 7.

A one-piece or multi-piece flywheel 3, 4 is mounted on the splined shaft 2, its axial position being defined by an assembly of axial neodymium magnets 6.

A radial neodymium magnet assembly 5 is inserted into the protective sleeve 8, made of aluminum casting or steel weldment, around the circumference of the cylindrical surface. The protective sleeve 8 is then pushed over the flywheel to the base plate 7.

The information display 10, which shows the important parameters of the device, is attached at the top to the protective case 8.

The device is then connected to the mains by 230 V or 3x400 V or other power supply cables. The backup power supply gradually reaches the operating nominal speed of the flywheel, which then keeps constant at a stable supply voltage. In the event of a sudden drop in voltage in the 230 V mains, the device switches to generator mode and the asynchronous motor generates electricity there while the flywheel speed drops. After a subsequent resumption of power supply from the 230 V mains, the asynchronous electric motor spins the flywheel again to its nominal constant speed.

PROTECTION REQUIREMENTS

Claims (3)

1. An electromechanical back-up power supply and stabilizer, the main components of which are a high-speed electric motor (1), a one-piece or multi-piece flywheel (3, 4), a neodymium magnet assembly (5), control electronics (6) and information display (9). characterized by the fact that its main benefit is the coverage of micro power outages in households or industrial applications. An electromechanical backup power supply and a power stabilizer according to claim 1, characterized in that the one-piece or multi-piece flywheel (3, 4) is movably connected in axial direction on the splined shaft (2) to the electric motor (1). An electromechanical backup power supply and a power stabilizer according to claims 1 and 2, characterized in that the neodymium magnet assembly (5) serves for radial stabilization of the one-piece or multi-piece flywheel (3, 4) and at the same time ensures axial support by magnetic levitation.