JPH0662540A - Reluctance motor - Google Patents

Abstract

PURPOSE:To increase magnetic flux and output torque by shortening average magnetic path length rotor and reducing a magnetic resistance. CONSTITUTION:A rotor core body 10 having a plurality of salient poles 12a, 12b,... projected at the external circumference keeping interval is held by the supporting members 20, 20' with a supporting piece 22 extended from a supporting plate 21 engaged with a recessed portion 15 provided between the salient poles. A supporting axle 26 is provided on the supporting plate in the direction opposed to the supporting piece 22. The center of the rotor core body 10 is not provided with an axle which has a large magnetic resistance to prevent flow of magnetic flux. Therefore the magnetic flux flows linearly between the poles provided opposed with each other without branching and alternation.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to an improved reluctance motor structure.

[0002]

2. Description of the Related Art A conventional reluctance motor has an exciting magnetic pole 92 excited by an exciting coil 94, as shown in FIG.
Has a ring-shaped stator 90, and a rotor 100 is rotatably provided in the stator. As shown in FIG. 7, the rotor is formed by laminating electromagnetic steel plates and the like to form a rotor core 150 having a plurality of salient poles 110 (110a, ..., 110d) on the outer circumference of a circular base, and an axis in the laminating direction at the center thereof. 200 is inserted. The shaft 200 is made of a material different from the rotor core material. This is because the above-mentioned electromagnetic steel sheets and the like contain Si or the like for the purpose of effectively increasing the magnetic flux exerted on the rotor and increasing the magnetic permeability and reducing the eddy current loss. Since it is low, the shaft 200
Is a material that has high strength.

[0003]

In such a reluctance motor, when a plurality of exciting magnetic poles projecting inward of the stator are excited, the magnetic flux generated thereby tends to flow in the rotor. However, in the conventional reluctance motor, the rotor shaft 200 is made of a material having high strength as described above, but the magnetic permeability is poor. Therefore, as shown in FIG. 8, one salient pole 110a goes to the salient pole 110c. The magnetic flux I avoids flowing inside the shaft 200 and bypasses the periphery thereof and flows to the opposing salient poles 110c. Therefore, there is a problem that the average magnetic path length becomes long and the magnetic resistance becomes large. Therefore, in view of the above problems, it is an object of the present invention to provide a reluctance motor in which the average magnetic path length in the rotor is shortened and the magnetic resistance is reduced to increase the magnetic flux and increase the output torque. And

[0004]

In order to achieve the above object, the present invention provides a reluctance motor in which a rotor is rotatably arranged in a ring-shaped stator.
The rotor core body and a support member fitted to the rotor core body from both sides in the axial direction thereof, the rotor core body having a core portion and a plurality of salient poles projecting at an outer periphery of the core portion at predetermined angular intervals, A recess is formed between the salient poles,
The support member includes a support plate, a plurality of support pieces extending from the support plate in the same direction as the axis of the core portion and fitted into the recesses, respectively, and from the support plate in a direction opposite to the support piece coaxial with the axis of the rotor core body. And a support shaft extending to the.

[0005]

When the exciting magnetic pole of the stator is excited, the magnetic flux generated thereby flows from one salient pole of the rotor through the rotor core body to the opposing salient pole. On this occasion,
Since the axis having low magnetic permeability does not penetrate through the center of the core, the flow of magnetic flux is not obstructed, and the main flow of the magnetic flux smoothly flows straight without detouring. As a result, the average magnetic path length is shortened, the magnetic resistance is reduced, the magnetic flux is increased, and the output torque is also increased.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1, 2 and 3 show an embodiment of the present invention. The rotor 1 is composed of a rotor core body 10 and a pair of supporting members 20 and 20 ′ facing each other, and is arranged inside a ring-shaped stator similar to the conventional example (not shown). The rotor core body 10 is formed by laminating thin electromagnetic steel sheets having high electric resistance so as to insulate the layers from each other, and each has a circular base and concentric fan-shaped projections protruding at 90 degree intervals on the outer circumference of the circular base. It has a protrusion. As a result, the rotor core body 10 has a cylindrical core portion 11 having a central axis Z as an overall shape, and four salient poles 12 extending to the outer periphery of the core portion 11 and having a fan-shaped cross section concentric with the core portion 12. (12a, ..., 12d), and a recess 15 having a bottom surface of a part of the outer peripheral surface of the core portion 11 between the salient poles.
Are formed.

The fitting support members 20 and 20 'have the same shape and are fitted into the rotor core body 10 from both axial sides of the rotor core body 10. FIG. 1 particularly shows the support member 20 before fitting, and FIG. 2 shows a state in which the support members 20 and 20 'are fitted together. Each of the support members 20 and 20 ′ is provided with a circular support plate 21 and a support piece 22 that is provided on the outer periphery of the support plate 21 so as to project in the axial direction toward the rotor core body 10 at 90 ° intervals. The support piece 22 has an arcuate outer peripheral surface 23 having the same radius as that of the circular support plate 21, and an inner peripheral surface 24 contacting the circumference of the core portion 11 of the rotor core body 10, and is formed in an arcuate cross section. . Also, the circular support plate 2
At the center of the outer surface 25 of No. 1, a support shaft 26 extending in the direction opposite to the support piece 22 is provided in a protruding manner.

The support members 20 and 20 'are mounted by fitting a plurality of support pieces 22 into the respective recesses 15 of the rotor core body 10 from both sides in the axial direction and in close contact with the bottom surfaces of the recesses. In this fitted state, the support members 20, 2
The 0'support shafts 26, 26 are coaxial with the central axis Z of the rotor core body 10. The rotor 1 in which the rotor core body 10 is supported by the support members 20 and 20 'is axially controlled inside the stator by the support shafts 26 and 26. The width dimension of each support piece 22 is matched with the width of the recess 15 so that there is no play between the support pieces and the rotor core body 10 in the rotational direction.

The embodiment is constructed as described above, and since the shaft having a low magnetic permeability as in the prior art does not penetrate the center of the core portion 11, there is no obstruction to the flow of magnetic flux.
As shown in, the magnetic flux I smoothly and linearly flows from one salient pole 12a toward the opposite salient pole 12c. This shortens the average magnetic path length in the rotor. Also,
Since the support shaft serving as the rotation shaft of the rotor extends from the circular support plate having a large area equivalent to the cross section of the rotor core body as a base, it has high support rigidity when the rotor rotates. It should be noted that, within the range in which a predetermined support rigidity is obtained according to the purpose of use of the motor, the circular support plate is thinned out or the circular support plate has a small diameter so that the support piece 22 'is replaced with the circular support plate 21' as shown in FIG. Can also be extended in an L-shape.

[0010]

As described above, the present invention provides a support member fitted between salient poles, that is, the outer peripheral portion of the rotor core body from both sides without inserting the support shaft for rotating the rotor into the rotor core body. Since it is provided, the magnetic flux from the exciting magnetic pole of the stator does not largely detour due to the obstruction of the shaft having large magnetic resistance, and the magnetic flux from one salient pole to the opposite salient pole flows smoothly linearly. Therefore, the average magnetic path length is shortened, the magnetic resistance is reduced, the magnetic flux is increased, and the output torque is increased.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing an assembled state of the rotor in the embodiment.

3 is a view on arrow A in FIG. 2. FIG.

FIG. 4 is an explanatory diagram showing a flow of magnetic flux.

FIG. 5 is a perspective view showing a modified example of a support member.

FIG. 6 is a diagram showing a conventional example.

FIG. 7 is a perspective view showing a rotor in a conventional example.

FIG. 8 is an explanatory diagram showing a flow of magnetic flux of a conventional rotor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 rotor 10 rotor core main body 11 core portion 12 salient pole 15 concave portion 20, 20 'support member 21 support plate 22 support piece 23 outer peripheral surface 24 inner peripheral surface 25 outer surface 26 support shaft 90 stator 92 exciting magnetic pole 94 exciting coil 100 rotor 110 protruding Pole 150 rotor core 200 axis

Claims (1)

[Claims] 1. In a reluctance motor in which a rotor is rotatably arranged in a ring-shaped stator, the rotor comprises a rotor core body and a support member fitted to the rotor core body from both axial sides thereof. The main body has a core portion and a plurality of salient poles protruding at a predetermined angular interval on the outer periphery of the core portion, and recesses are formed between the salient poles, and the support member includes a support plate and the support plate. A plurality of support pieces extending from the plate in the same direction as the axis of the core portion and fitted in the recesses, and a support shaft extending from the support plate coaxially with the axis of the rotor core body in the opposite direction to the support piece. A reluctance motor characterized by being used.