BRUSHLESS MOTOR WITH DOUBLE ROTORS

Abstract

It is a type of brushless motor with double rotors which is composed of one inside motor with radial-vertical permanent magnetic circuit and one outside motor with magnetic excitation circuit. The inside motor is made up of the input shaft, the inner rotor core, the permanent magnetic steel of the inner rotor, the external rotor core and the inner winding of the external rotor. The outside motor is made up of the stator winding, the stator core, the external rotor core and the external winding of the external rotor. From the inside toward outside, the specific structural arrangement is as follows: the input shaft, the inner rotor, the inner rotor core, the permanent magnetic steel of inner rotor core, the external rotor core, the inner winding of external core, the external winding of external rotor, the stator core, the stator winding and the shell. The inner rotor core is fixed on the input shaft and spin together with the shaft; the stator core is fixed on the shell, and the external rotor core is rigidly connected with the output shaft and spin together with the shaft. The inner winding of the external rotor and the external winding of external rotor are mutually connected to form a circuit. The motor may coordinate the work between the inner and external motors only through a set of inverter. This invention is low in cost, compact in structure, reliable in function, and long in service life.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is the side view of the surface-type brushless double-rotor motor structure with magnetic steel

FIG. 2 is the section view of the surface-type brushless double-rotor motor structure with magnetic steel

EXPLANATION TO THE DRAWING MARKS OF MAJOR SPARE PARTS

1. Input shaft; 2. Inner rotor core; 3. Permanent magnetic steel of inner rotor; 4. Inner winding of external rotor; 5. External winding of external rotor; 6. External rotor core; 7. Stator core; 8. Stator winding; 9. Output shaft; 10. Shell; 11. Inverter.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following descriptions are of exemplary embodiments only, and are not intended to limit the scope, applicability or configuration of the invention in any way. Rather, the following description provides a convenient illustration for implementing exemplary embodiments of the invention. Various changes to the described embodiments may be made in the function and arrangement of the elements described without departing from the scope of the invention as set forth in the appended claims.

As shown in FIGS. 1 and 2, such brushless permanent magnetic motor with double rotors is featured by one inside motor with radial-vertical permanent magnetic circuit and one outside motor with magnetic excitation circuit. The inside motor is made up of the input shaft 1, inner rotor core 2, permanent magnetic steel of inner rotor 3, external rotor core 6 and inner winding of external rotor 4. The outside motor is made up of the stator winding 8, stator core 7, external rotor core 6 and external winding of external rotor 5. From the inside toward outside, the specific structural arrangement is as follows: the input shaft 1, the inner rotor core 2, the permanent magnetic steel of inner rotor core 3, inner winding of external core 6, and external winding of external rotor 4, stator core 7, stator winding 8, and the shell 10. The inner rotor core 2 is fixed on the input shaft 1 and spin together with the shaft, the stator core 7 is fixed on the shell 10, and the external rotor core 6 is rigidly connected with the output shaft 9 and spin together with the shaft. Among them, the inner winding of external rotor 4 and the external winding of external rotor 5 are mutually connected and form a closed circuit, and the stator winding 8 is connected with the inverter 11.

The input shaft 1 is connected with the engine's crankshaft. The surface of the inner rotor is installed with the permanent magnetic steel and the inner rotor is fixed on the input shaft 1 for passing the power and energy from the engine. The external rotor has two one set of inside armature winding and one set of outside armature winding, and it is mechanically connected with the output shaft 9. The output shaft is connected with the load to output the power and energy. From above-mentioned motor structure with double-rotor, we may see that the brushless hybrid magnetic excitation motor with double rotors in an integration of two motors, one is composed of the external rotor and the stator, and another is composed of the external rotor and the inner rotor.

The permanent magnetic steel in the inner rotor structure can be fixed on the surface of the inner rotor or inserted inside the rotor.

According to different position for fixing the permanent magnetic steel, the inner rotor can be classified into the surface-type inner rotor structure and the interior-type inner rotor structure. If the permanent magnetic steel is fixed on the surface of the inner rotor, it is the surface-type inner rotor structure; it is featured as the motor having relatively big effective air gap, the armature response being greatly reduced, and simple structure. If the permanent magnetic steel is inserted inside the rotor, it is the interior-type inner rotor structure; it is featured as high magnetism which may generate extra reluctance component and being helpful for the running status with constant power; by inserting the permanent magnetic steel into the rotor, the mechanical completeness during high-speed running may be maintained.

It will be understood that each of the elements described above, or two or more together may also find a useful application in other types of methods differing from the type described above.

While certain novel features of this invention have been shown and described and are pointed out in the annexed claim, it is not intended to be limited to the details above, since it will be understood that various omissions, modifications, substitutions and changes in the forms and details of the device illustrated and in its operation can be made by those skilled in the art without departing in any way from the spirit of the present invention.

Claims

1. The characteristics of such brushless motor with double rotors lies in that it is composed of one inside motor with radial-vertical permanent magnetic circuit and one outside motor with magnetic excitation circuit. The inside motor is made up of the input shaft (1), the inner rotor core (2), the permanent magnetic steel of inner rotor (3), the external rotor core (6) and the inner winding of external rotor (4). The outside motor is made up of the stator winding (8), the stator core (7), the external rotor core (6) and the external winding of external rotor (5). From the inside toward outside, the specific structural arrangement is as follows: the input shaft (1), the inner rotor core (2), the permanent magnetic steel of inner rotor core (3), the external rotor core (6), the inner winding of external rotor (4), the external winding of external rotor (5), the stator core (7), the stator winding (8) and the shell (10). The inner rotor core (2) is fixed on the input shaft (1) and spin together with the shaft, the stator core (7) is fixed on the shell (10), and the external rotor core (6) is rigidly connected with the output shaft (9) and spin together with the shaft. The inner winding of the external rotor (4) and the external winding of the external rotor (5) share a mutual connection and thus form a circuit, and the stator winding (8) is connected with the inverter (11).

2. The feature of the brushless motor with double rotors as described in Rights 1 is that the above-mentioned permanent magnetic steel of the inner rotor (3) is situated on the surface of the inner rotor core (2), forming the surface-type inner rotor structure with magnetic steel. 3. The feature of the brushless motor with double rotors as described in Rights 1 is that the above-mentioned permanent magnetic steel of the inner rotor (3) is embedded in the inner rotor core (2), forming the interior-type inner rotor structure with magnetic steel. 4. The feature of the brushless motor with double rotors as described in Rights 1 is that it only needs a set of inverter to coordinate the work between the inside motor and outside motor.