JP2002354769A - Inductor motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a defect that a belt pulley and a gear are cantilevered and held at an end of a rotor shaft, bent deformation is easily generated in the pulley and a gear fixing part and a driving mechanism is not miniaturized in a conventional outer circumference driving motor. SOLUTION: In an inductor motor, two groups of stators of an outer rotor motor are coaxially and continuously provided and both ends of the outer rotor as the belt pulley are rotatably held between the stators. An integral stator pole 15 is formed from one and another stator pole elements 15a, 15b for forming outer circumferences of two groups of the stators. One stator pole element comprises a connection 16c for connecting at least one crowning of an A phase magnetic pole 16a to a corresponding bottom of a B phase magnetic pole 16b. Another stator pole element is made the same as one stator pole element. One and another stator pole elements are arranged so as to be mutually displaced by 1/2 magnetic pole pitch in the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inductor type electric motor, and more particularly to an inductor type electric motor having an abduction type rotor.

[0002]

2. Description of the Related Art Conventionally, as an electric motor used for a belt drive, an inner rotor type inductor type electric motor 1 in which two stators 1a and 1b are coaxially connected in an axial direction as shown in FIG. Rotor shaft 2 of electric motor 1
Is attached to one end of the belt pulley.

Reference numeral 4 denotes a stator case, 5 denotes a stator pole, 6 denotes a coil bobbin, 7 denotes a stator coil wound around the coil bobbin 6, 8 denotes a permanent magnet rotor, and 9 denotes a belt suspended at the center of the belt pulley 3. Is shown.

[0004]

In such a conventional electric motor, the belt pulley 3 is connected to the rotor shaft 2 of the electric motor 1.
When the belt bending load is large, the belt pulley 3 is likely to bend and deform when the bending load of the belt is large. In addition, since the belt pulley 3 and the electric motor 1 are connected in series, the shaft is There is a drawback that the belt drive mechanism cannot be miniaturized because it becomes longer in the direction.

The present invention has been made to eliminate the above disadvantages.

[0006]

SUMMARY OF THE INVENTION An inductor type electric motor according to the present invention has two end portions rotatable by one and the other stator portions connected coaxially and a shaft portion projecting outward in the axial direction from the stator portion. An outer rotor functioning as a belt pulley supported on the outer rotor, a permanent magnet provided on the inner peripheral surface of the outer rotor and alternately magnetized N and S in the circumferential direction, and opposing the permanent magnet via a gap. A stator pole integrally formed on the outer periphery of the stator portion, and one of the stator poles corresponding to the one stator portion protrudes axially in a mountain shape and is circumferentially separated from each other. plural
A-phase magnetic pole, B-phase magnetic pole of similar shape nested in this A-phase magnetic pole through a slot, and at least one top of these A-phase magnetic poles connected to the corresponding bottom of B-phase magnetic pole The other stator pole element has the same configuration as the above-mentioned one stator pole element, and the one and the other stator pole elements are circumferentially connected to each other by one.
The feature is that the arrangement is shifted by / 2 magnetic pole pitch.

[0007] The inductor type electric motor of the present invention comprises:
One and the other stator portions connected coaxially, an outer rotor functioning as a belt pulley rotatably supported at both end portions by both end portions of the stator portion, and a circumference provided on the inner peripheral surface of the outer rotor. In the direction
A permanent magnet N and S are alternately magnetized, and a stator pole integrally formed on the outer periphery of the stator portion so as to face the permanent magnet via a gap. A plurality of A-phase magnetic poles protruding in a mountain shape in the axial direction with one of the corresponding stator pole elements being circumferentially separated from each other, and a similar shape nested in the A-phase magnetic poles via a slot. B phase magnetic pole,
At least one of the top portions of these A-phase magnetic poles is constituted by a connection portion that connects to the corresponding bottom portion of the B-phase magnetic pole, and the other stator pole element has the same configuration as that of the one stator pole element. Are arranged so as to be displaced from each other by a half magnetic pole pitch in the circumferential direction.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1, two stator portions 10a and 10b of an outer low type PM motor 10 are coaxially arranged.
0a, 10b, the inner peripheral surface of a cylindrical outer rotor 11 is opposed to the outer peripheral surface of the outer rotor 11 via a gap.
1 are rotatably supported by shaft portions projecting axially outward from the stator portions 10a and 10b via bearings 12a and 12b, and the outer rotor 11 is used as a belt pulley and a belt 13 is suspended at an intermediate portion thereof. Let me know.

Reference numeral 14 denotes a cylindrical permanent magnet attached to the inner peripheral surface of the outer rotor 11 and N and S are alternately magnetized to a predetermined number of magnetic poles in the circumferential direction. The stator portions 10a and 10b provided to face each other
1 shows a stator pole integrally having one and the other cylindrical stator pole elements 15a and 15b forming the outer periphery of the stator pole.

As shown in FIG. 2, in the present invention, one of the stator pole elements 15a of the stator pole 15 is used.
A plurality of A-phase magnetic poles 16a protruding in a mountain shape in the axial direction and circumferentially separated from each other, and a B-phase having a similar shape opposed to the A-phase magnetic pole 16a through a slot 17 in a nested manner. The magnetic pole 16b and at least one of the tops of these A-phase magnetic poles 16a.
A connection portion 16c is connected to a corresponding bottom portion of the B-phase magnetic pole 16b. Here, the nested type means an arrangement in which a mountain-shaped protruding portion of one of the stator pole elements 15a alternately enters a valley-shaped concave portion of the other stator pole element 15b.

The other stator pole element 15b has the same configuration as that of the one stator pole element 15a.
Reference numeral 15b is arranged so as to be shifted from one another in the circumferential direction by a half magnetic pole pitch similarly to a general inductor type electric motor.

The N and S magnetization pitches of the permanent magnet 14 are set equal to the magnetic pole pitches of the stator pole elements 15a and 15b.

The stator pole 15 is formed by punching and rounding a magnetic iron plate.

In the present invention, the stator pole elements 15a, 15b are not displaced from each other by a half magnetic pole pitch in the circumferential direction, and instead, the stator poles 15a, 15b of the N and S magnetized portions of the permanent magnet 14 are replaced. The opposing portions may be shifted from each other in the circumferential direction by a half magnetic pole pitch.

FIG. 3 shows another embodiment of the present invention in which the bearings 12a and 12b are provided on the outer periphery of both ends of the stator pole 15, and the operation and effect are the same as those of the previous embodiment.

[0017]

As described above, in the inductor type electric motor of the present invention, since the outer rotor system is used, the rotor energy is large and a high torque can be obtained, which is suitable as an outer peripheral drive type electric motor. Can reduce the step angle and increase the resolution.

Further, since the outer rotor 11 corresponding to the belt pulley is supported at both ends of the annular stator portion and receives a load at the central portion, the strength against bending in driving can be greatly improved. Since the stator portion of the electric motor is housed on the peripheral side, the length in the axial direction can be reduced, and the drive mechanism can be downsized.

Further, a normal PM type stator pole cannot be made long because it is bent. However, in the present invention, the length of the stator pole element can be increased, so that an elongated motor can be realized, and a belt drive (wide belt) can be realized. Is effective. Also, the above-mentioned stator pole element is punched out,
There are various benefits, such as being very easy to produce by rolling.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of an inductor type electric motor of the present invention.

FIG. 2 is a perspective view of a stator pole of the electric motor shown in FIG.

FIG. 3 is a vertical sectional side view showing another embodiment of the inductor type electric motor of the present invention.

FIG. 4 is a vertical sectional side view of a conventional inductor type electric motor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inductor type motor 1a Stator 1b Stator 2 Rotor shaft 3 Belt pulley 4 Stator case 5 Stator pole 6 Coil bobbin 7 Stator coil 8 Permanent magnet rotor 9 Belt 10 PM type motor 10a Stator part 10b Stator part 11 Outer rotor 12a Bearing 12b Bearing 13 Belt 14 Permanent magnet 15 Stator pole 15a Stator pole element 15b Stator pole element 16a A-phase magnetic pole 16b B-phase magnetic pole 16c Connection 17 Slot

Claims (2)

[Claims] An outer rotor functioning as a belt pulley having both ends rotatably supported by one and the other stator portions coaxially connected, and a shaft portion protruding axially outward from the stator portion; A permanent magnet provided on the inner peripheral surface of the outer rotor and alternately magnetized in the circumferential direction, and a stator pole integrally formed on the outer periphery of the stator portion so as to face the permanent magnet via a gap. A plurality of A-phase magnetic poles which are circumferentially separated from each other, and which protrude one of the stator pole elements corresponding to the one stator portion in the axial direction in a mountain shape in the axial direction, Consisting of nested B-phase magnetic poles of the same shape facing each other via a slot, and a connecting part connecting at least one of the tops of these A-phase magnetic poles to the corresponding bottom of the B-phase magnetic pole An inductor wherein the other stator pole element has a configuration similar to that of the one stator pole element, and the one and the other stator pole elements are arranged so as to be shifted from each other by a half magnetic pole pitch in a circumferential direction. Type electric motor. 2. An outer rotor functioning as a belt pulley having both end portions rotatably supported by both end portions of the stator portion, and an inner peripheral surface of the outer rotor. And a stator pole integrally formed on the outer periphery of the stator portion so as to face the permanent magnet via an air gap. A plurality of A-phase magnetic poles which protrude in the axial direction from one stator pole element corresponding to the one stator portion, and which are circumferentially separated from each other;
B-phase magnetic poles of the same shape opposed to each other via the slot in a nested manner with the phase magnetic poles, and connecting portions for connecting at least one of the tops of these A-phase magnetic poles to the corresponding bottoms of the B-phase magnetic poles. An inductor wherein the other stator pole element has a configuration similar to that of the one stator pole element, and the one and the other stator pole elements are arranged so as to be shifted from each other by a half magnetic pole pitch in a circumferential direction. Type electric motor.