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Patent Searching and Data


Title:
ELECTRIC GENERATOR
Document Type and Number:
WIPO Patent Application WO/2015/154152
Kind Code:
A2
Abstract:
The invention refers to an electric generator for production of electric current, which is driven by an external electric rotary motor inbuilt in the generator rotor. The rotor of the external electric rotating motor is also rotor of the generator. The generator consists of a housing (13) in which is mounted the stator of the generator (3), the generator stator (3) comprises vertical coils (6); the cylindrical rotor (7) is located concentrically to the vertical coils, multiple permanent magnets (5), connected by means of bearings (11) to the axis (10), are mounted on the cylindrical rotor (7). The electric motor stator coils (8) are wound on the stator (9), which is mounted fixedly to the axis (10), which is connected fixedly to the generator upper cover (1) and the generator lower cover (4).

Inventors:
GARVALOV ATANAS HRISTOV (BG)
Application Number:
PCT/BG2014/000017
Publication Date:
October 15, 2015
Filing Date:
April 14, 2014
Export Citation:
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Assignee:
HIDROSYST LTD (BG)
International Classes:
H02K16/04
Attorney, Agent or Firm:
KOSTADINOVA, Rossitsa Kirilova (office 5, 1000 Sofia, BG)
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Claims:
PATENT CLAIMS

1. Electric generator consisting of a housing (13) comprising a generator rotor (7) and a generator stator (3) as well as an electric motor stator (9), the generator rotor (7) is built of multiple permanent magnets (5) and the generator stator (3) has stator coils (6), the electric motor stator (9) consists of stator coils (8) charcterized in that the permanent magnets (5) are common for the generator and the electric motor; the housing (13) is provided with an upper cover (1) and lower cover (2), the rotor (7) is located concentrically to the stator (3) and by means of bearings (11) it is connected to an axis (1), whose ends are mounted fixedly on the upper cover (1) and the lower cover (4) of the housing (13), where the electric motor stator (9) with stator coils (8) is mounted fixedly inside the rotor (7), the internal sides of the bearing (11) have contact with the upper cover (1) and the lower caver (4), while the external sides of the bearings (11) have contact with the rotor upper flange (2) and rotor lower flange (15), the axis (10) is mounted fixedly to the lower cover (4) by means of bolts (14).

2. Electric generator, according to claim 1 , charcterized in that the rotor (7) has a magnetic core (12) comprising the permanent magnets (5).

3. Electric generator, according to claim 1 , characterized in that the permanent magnets (5) are mounted on a metal basis located on the rotor (7).

Description:
ELECTRIC GENERATOR

TECHNIACAL FIELD

The invention relates to an electric generator that is used in industry to power industrial enterprises and small-scale production facilities, which require high accuracy of power voltage and frequency. Small scale generators can be installed on electric vehicles and other vehicles that use an electric motor with high driving frequency.

BACKGROUND OF INVENTION

Well known is the electric power generator, consisting of a stator with copper coils, comprising a permanent magnet rotor. Electric power generators with permanent magnets are featured by high efficiency, simple construction and small dimensions.

Well known is the motor-generator of US 6,541 ,887 B2, consisting of a housing 1 comprising a rotor 3 and a stator 4 with two stator coils 8 of the generator. The generator rotor has an axis 2, on which a multipolar permanent magnetic element is mounted. The electric motor stator has two stator coils and is located axially in the two opposite ends of the generator rotor. Regulating the magnetic induction in electric motor stator coils provides control on generator rotor revolutions, which makes it possible to regulate the required voltage and frequency of the electric current produced by the generator. Upon rotation of the rotor, the magnetic field of the permanent magnets crosses vertically the stator coils of the generator and generates electromotive force in them. Regulating the magnetic induction in the electric motor stator coils is controlled by the generator rotor revolutions, which allows regulating the required voltage and frequency of the electric current produced by the generator.

In the above-mentioned motor-generator the size of electric motor stator coils is many times smaller than the generator rotor size. The length of the permanent magnets in the rotor is equal to the length of the generator stator coils. They do not reach the electric motor stator coils, which makes the electric motor inefficient. To turn the rotor the electric motor uses permanent magnet waves that are distributed through a magnetic core. The lack of direct contact between the electric motor stator and the permanent magnets reduces many times the electric motor torque and makes the generator inefficient.

DESCRIPTION OF THE INVENTION

The object of the invention is to create an electric generator with increased productivity and improved cos φ by reducing the kinetic energy needed to drive the generator rotor and simultaneously keeping the generator sizes.

This object is solved by an electric generator, consisting of a housing comprising the generator rotor and generator stator as well as an electric motor stator. The generator rotor is built of multiple permanent magnets, while the generator stator has stator coils. The electric motor stator consists of stator coils.

According to the invention the housing is provided with upper cover and lower cover, the generator rotor is located concentrically to the generator stator and by means of bearings it is connected to an axis, whose ends are mounted fixedly in the upper and lower housing covers. The generator rotor has got upper flange and lower flange. The electric motor stator with stator coils is mounted fixedly inside the generator rotor. The internal sides of the bearings are in contact with the upper and lower covers. The external sides of the bearings are in contact with the rotor upper and lower flanges. The axis is mounted fixedly to the bottom cover by means of bolts. The permanent magnets are common for the generator and the electric motor. The electric motor rotor is also generator rotor.

According to a version for carrying out the invention, the generator rotor has magnetic cores in which are mounted the permanent magnets.

According to another version for carrying out the invention, the permanent magnets may be mounted on a metal basis located on the generator rotor.

A compact construction is achieved since the electric motor and generator have common permanent magnets. The rotor, which is common for the generator and the electric motor, reduces friction losses in the bearings. The generator rotor bearings are also electric motor rotor bearings. The lightweight rotor construction contributes also for reducing friction losses. The described construction makes it possible to produce electric power by converting electric motor kinetic energy into electrical energy. The direct contact between the stator magnetic flow and rotor permanent magnets allows reaching high electric motor torque upon low electric energy consumption.

DESCRIPTION OF THE FIGURES

Fig. 1 is representation of vertical section view of the electric power generator.

Fig. 2 is representation of vertical section view of the rotor.

Fig. 3 is representation of horizontal section view of the generator.

Fig. 4 is representation of vertical section view of the electric motor.

Fig. 5 is representation general view of the stator and generator stator coils and electric motor stator coils.

EMBODIMENT FOR CARRYING OUT THE INVENTION

Referring to the enclosed Fig. 1 to Fig. 4, the electric power generator consists of a housing 13 provided with an upper cover 1 and a lower cover 4. The housing 13 comprises a generator rotor 7 and a generator stator 3 as well as an electric motor stator 9. The generator rotor 7 is built of multiple permanent magnets 5 and the generator stator has stator coils 6. The electric motor stator 9 consists of stator coils 8.

The generator rotor 7 has an upper flange 2 and a lower flange 15. The rotor 7 is located concentrically to the generator stator 3 and by means of bearings 11 it is connected to an axis 10, whose ends are mounted fixedly in the upper cover 1 and lower cover 4 of the housing 13. Inside the generator rotor 7 is mounted fixedly the electric motor stator 9 with the stator coils 8. The internal sides of the bearings 11 have contact with the upper cover 1 and lower cover 4. The external sides of the bearings 11 have contact with the rotor upper flange 2 and rotor lower flange 15. The axis 10 is mounted fixedly to the lower cover 4 by means of bolts 14. The generator permanent magnets 5 are also electric motor permanent magnets.

According to a version execution of the invention, the generator rotor 7 has magnetic circuits comprising the permanent magnets 5.

According to another version execution of the invention, the permanent magnets 5 may be mounted on a metal basis located upon generator rotor. USE OF THE INVENTION

When voltage is applied to electric motor stator coils 8 a magnetic flow is generated, which by means of the electric motor stator 9 makes contact with the magnetic flow inside the permanent magnets 5 and makes the rotor 7 rotate. Upon rotor rotation the magnetic field of the permanent magnets 5 on rotor 7 external diameter crosses perpendicularly the generator coils 6 and generates electromotive voltage. Regulating the voltage supplied to the electric motor stator coils 8 provides control on motor revolutions 7, resulting in controlling the output voltage and frequency of the generated electric power.