JPH07112341B2 - Rotating electric machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine, and more particularly to a rotary electric machine having a moving coil type rotor having a hollow coil and a rotor shaft provided along the axis of the hollow coil.

[0002]

2. Description of the Related Art A rotary electric machine having a moving coil type rotor composed of a conventional hollow coil and a rotor shaft provided along the axis of the coil will be described with reference to FIG. Reference numeral 100 denotes a rotor, which includes a hollow cylindrical coil 102 and a rotor shaft 104 inserted through the center of the coil 102. When the rotor shaft 104 rotates about the axis, the coil 102 also rotates integrally. The left end surface of the coil 102 is open. 106 is a casing, 2
It is formed in a heavy cylinder shape, and the rotor shaft 104 is rotatably inserted in the inner cylinder portion 108. At the same time, the inner cylindrical portion 108 is loosely inserted into the coil 102 from the open surface side of the coil 102 in a non-contact manner. Reference numeral 110 denotes a stator magnet, which is arranged side by side in the circumferential direction on the outer peripheral surface of the inner cylindrical portion 108. When this rotor 100 is used as a rotor of a motor, for example,
When the coil 102 is energized, a magnetic pole is generated on the inner peripheral surface of the coil 102, the magnetic force balance with the stator magnet 110 is lost, and the rotor 100 rotates about the rotor shaft 104.

[0003]

However, the above conventional rotor 100 has the following problems. Since the stator magnet 110 is disposed only inside the coil 102, there is a limit in increasing the strength of the magnetic field generated by the magnet 110 for the purpose of improving motor efficiency and power generation efficiency. Further, since the conventional coil 102 is formed in a cup shape with one end surface (left end surface) opened, heat may be generated by the current flowing through the coil 102 and the coil 102 may be deformed. Therefore, coil 1
The distance between 02 and the magnet 110 cannot be set small, which hinders improvement in motor efficiency and power generation efficiency. Further, since the coil 102 and the rotor shaft 104 are only connected at one portion of the portion 112, there is a problem that a large coil cannot be supported. Therefore, it is an object of the present invention to provide a rotating electric machine capable of increasing efficiency and capable of adopting a large coil.

[0004]

In order to solve the above problems, the present invention has the following constitution. That is, in a rotating electric machine having a moving coil type rotor composed of a hollow coil and a rotor shaft provided along the axis of the coil, an outer magnet stator disposed along the outer periphery of the coil, and the coil And an inner magnet stator disposed along the inner circumference of the outer magnet.
The stator is the inner surface of the casing that covers the rotor.
And the inner magnet stator is arranged in the rotor.
It is fitted onto the shaft so that it can rotate around the axis and
Fixed by magnetic coupling with the side magnet stator
It is characterized by Further, the coil may be formed in a cage shape in which both end surfaces in the axial direction are closed, and the inner magnet stator may be arranged in the coil. Further, the coil may be connected to the rotor shaft at both ends in the axial direction.

[0005]

[Operation] The operation will be described. By providing the outer magnet stator along the outer circumference of the coil and the inner magnet stator along the inner circumference of the coil, the magnetic force of the outer magnet stator and the inner magnet stator can be applied to the coil, so that a stronger magnetic field can be obtained. Can be formed on the coil. Further, when the coil is connected to the rotor shaft at both ends in the axial direction, deformation of the coil due to heat can be suppressed, so that the distance between the coil and the outer magnet stator and the inner magnet stator can be set small, and the coil Since the number of supporting points is increased, a large coil can be adopted.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings. FIG. 1 shows an exploded perspective view of a main part of a rotary electric machine 10 of this embodiment, and FIG. 2 shows a sectional view of its assembled state. First, the configuration will be described. Reference numeral 12 denotes a casing, which is made of a magnetic material (for example, iron).
The casing 12 is formed into a single cylindrical body by combining a pair of semi-cylindrical casing constituent members 12a and 12b. Both ends of the casing 12 are closed by closing members 14a and 14b having a through hole at the center. 16 is an outer stator magnet, and 2N is provided on the inner peripheral surface of the casing 12.
(N is a natural number) are provided. The outer stator magnets 16 are arranged side by side in the circumferential direction alternately with N and S poles. The plurality of outer stator magnets 16 form an outer magnet stator.

Reference numeral 18 denotes a rotor, which is a hollow coil 20.
And the rotor shaft 24 inserted along the axis of the coil 20.
Is a moving coil type rotor composed of and. Rotor 1
8 is housed in the casing 12, and both ends of the rotor shaft 24 are rotatably supported by bearings 26 arranged in the casing 12. The coil 20 is formed in a cage shape in which both end surfaces in the axial direction are closed by the members 28 and 30. The rotor shaft 24 is press-fitted into the centers of the members 28 and 30, and the coil 20 is connected and fixed to the rotor shaft 24 at both ends in the axial direction. By this fixing, the coil 20 can rotate integrally with the rotor shaft 24. Coil 20
2N (N is a natural number) flat coreless coil portions 22 are formed in the circumferential direction. 2N coreless coil parts 22
Faces the plurality of outer stator magnets 16.

Reference numeral 32 is a carrier, which is made of a magnetic material (for example, iron). The carrier 32 is a cage coil 20.
Inside the rotor shaft 2 through the ball bearing 36
It is fitted on the No. 4. Therefore, the rotor 18 is
It is rotatable with respect to. Reference numeral 34 denotes an inner stator magnet, and 2N (N is a natural number) pieces are provided on the outer peripheral surface of the carrier 32 in correspondence with the outer stator magnet 16. The inner stator magnets 34 are arranged side by side in the circumferential direction alternately with N and S poles. The carrier 32 and the plurality of inner stator magnets 34 form an inner magnet stator. The position of the inner magnet stator with respect to the rotor 18 must be fixed at a specific position. In the case of this embodiment, the outer stator magnet 16 fixed to the inner peripheral surface of the casing 12, and the carrier 3
Inner stator magnet 3 fixed to the outer peripheral surface of 2
4 magnetically attract each other, so that the position of the inner magnet stator is fixed. Due to this magnetic coupling, the inner magnet stator can be fixed in the cage coil 20 whose both ends are closed. Although not shown in the drawings, a brush or the like for supplying power to the coil 20 or extracting power from the coil 20 is provided in the casing 12.

When the rotating electric machine 10 having the above structure is used as a motor, when the coil 20 is energized through the brush (not shown), magnetic poles are generated on the circumferential surface of the coil 20, and the outer stator magnet 16 and the inner stator are formed. The magnetic force balance with the magnet 34 is lost, and the rotor 18 rotates about the rotor shaft 24. On the other hand, when the rotary electric machine 10 is used as a generator, the rotor 18 is rotated about the rotor shaft 24 by an appropriate method. Then, induced electric power is generated in the coil 20 due to the magnetic forces of the outer stator magnet 16 and the inner stator magnet 34. This induced power can be taken out through the brush (not shown).

In the rotary electric machine 10 of this embodiment, the coil 20
Since the outer stator magnet 16 is provided along the outer circumference of the coil 20 and the inner stator magnet 34 is provided along the inner circumference of the coil 20, the magnetic forces of the outer stator magnet 16 and the inner stator magnet 34 can be applied to the coil 20. , A stronger magnetic field is generated in the coil 20 as compared with the case of only the inner stator magnet 34 (see FIG. 3).
Can be formed for. Also, the coil 20
Is coupled to the rotor shaft 24 via the members 28 and 30 at both ends in the axial direction, the deformation of the coil 20 due to the heat generated in the coil 20 can be suppressed, so that the coil 20, the outer stator magnet 16 and the inner stator magnet 34 are connected. The distance between and can be set small, and a stronger magnetic force can be applied to the coil 20. Further, since the number of supporting points of the coil 20 is increased, it is possible to make the coil large, and it is possible to increase the motor efficiency or the power generation efficiency. Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and it goes without saying that many modifications can be made without departing from the spirit of the invention. .

[0011]

When the rotating electric machine according to the present invention is used, the outer magnet stator is provided along the outer circumference of the coil, and the inner magnet stator is provided along the inner circumference of the coil. Since the magnetic forces of both the stators can be applied, it is possible to form a stronger magnetic field for the coil as compared with the case of using only one magnet stator as in the conventional case. Further, if the coil is connected to the rotor shaft at both ends in the axial direction, the deformation of the coil due to heat generated in the coil can be suppressed, so that the distance between the coil and the outer magnet stator and the inner magnet stator can be set small. , A stronger magnetic force can be applied to the coil, and the number of supporting points of the coil by the rotor shaft is increased, so that a large-sized coil can be realized and an efficient rotating electric machine can be realized. .

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of an embodiment of a rotating electric machine according to the present invention.

FIG. 2 is a sectional view of the assembled state.

FIG. 3 is a sectional view of a conventional rotating electric machine in an assembled state.

[Explanation of symbols]

 10 rotating electric machine 12 casing 12a, 12b casing constituent member 14a, 14b closing member 16 outer stator magnet 18 rotor 20 coil 22 flat coreless coil portion 24 rotor shaft 26 bearing 28, 30 member 32 carrier 34 inner stator magnet 36 ball bearing

Claims (3)

[Claims] 1. A rotating electric machine having a moving coil type rotor comprising a hollow coil and a rotor shaft provided along the axis of the hollow coil, wherein an outer magnet stator is provided along the outer circumference of the coil. , and a inner magnet stator disposed in the inner circumferential of the coil, the outer magnet stator covering said rotor Ke
Is disposed on the inner peripheral surface of the housing, and the inner magnet stator has an axis centered on the rotor shaft.
The outer magnet is rotatably fitted as a core and the outer magnet
A rotating electric machine characterized by being fixed by magnetic coupling with a stator . 2. The coil has both axial end faces closed.
The inner magnet stator is
2. It is arranged in the casing.
Rotating electric machine. 3. The coil has the roll at both ends in the axial direction.
2. The motor according to claim 1, wherein the motor is connected to the motor shaft.
The rotating electric machine according to 2.