JP2001028851A - Motor and starter generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve output of a motor. SOLUTION: A SR-motor 1 comprises a stator 3 including a plurality of salient poles 3a projected to the internal side, coils 7 wound respectively to the salient poles 3a of stators, and a rotor 2 including a plurality of salient poles 2a projected to the external side provided at the internal side of the stator 3. In this case, magnetic flux shielding portions 9a, 9b formed of a non- magnetic and conductive material are provided to any one of both sides of the salient poles 2a or rotor 2 and to the areas between the salient poles of rotor 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving a motor such as a switched reluctance motor (SR motor).

[0002]

2. Description of the Related Art An SR motor is known as one of conventional motors. As shown in FIGS. 9 and 10, the SR motor includes a stator (stator) 3 integrally formed with a plurality of inwardly projecting salient poles 3a on a cylindrical yoke, and a plurality of outwardly projecting salient poles 3a. A rotor (rotor) 2 having the salient poles 2a is arranged coaxially, and a winding (coil) 7 is wound around each salient pole 3a of the stator 3.

The SR motor shown in FIG. 1 is a three-phase motor in which the number of salient poles 2a of the rotor 2 is four and the number of salient poles 3a of the stator 3 is six. However, the number of the salient poles 2a of the rotor 2 and the number of the salient poles 3a of the stator 3 may be set to an even number which is not a multiple relation to each other. The number of salient poles of the stator is 8, the number of salient poles of the rotor is 8, and the number of salient poles of the stator is 12,
Other combinations may be used.

An electric current flows through a pair of opposed windings 7 of the stator 3 to generate a magnetic flux from the salient poles 3 a of the stator 3 to the salient poles 2 a of the rotor 2. By generating the torque, the torque is generated by attracting to the salient pole 3a.

At this time, as shown in FIG. 9, when certain salient poles of the stator 3 and the rotor 2 are opposed to each other, the other salient poles are displaced from each other. When the wire is energized, the salient poles 2a of the rotor 2 are continuously attracted, and the rotor 2 can be rotated about the shaft 5.

[0006] Such an SR motor can also function as a generator. The starting ends of the windings (winding sets) 7, 7 wound around the salient poles 3a of the stator 3 are connected to a power supply via a power element including a switch element (power transistor) and a diode, and are also connected via a diode. Ground. The ends of the windings 7, 7 are connected to a power supply via a diode, and are grounded via a similar power element including a switch element.

When these switch elements are turned on at the same time, current flows from the power supply to one of the switch elements, the windings 7, 7, and
It flows along the path of the other switch element that is grounded.
Energy is supplied from a power source and torque is generated. next,
When these switch elements are simultaneously turned off from this state, an electromotive force generated in the windings 7, 7 causes a current to flow through the path of one of the grounded diodes, the windings 7, 7, and the other diode, and energy to the power supply. Is regenerated. By appropriately setting the ON and OFF timings of the switch element, the regenerative energy can be made larger than the supplied energy, and thereby, it can function as a generator.

In the specification of the present application, the “motor” has a function of not only an electric motor (motor in a narrow sense) for generating power but also a generator (generator) for generating power. It shall include a generator motor.

[0009]

As shown in FIG. 9, the SR motor mainly includes the salient poles 3 of the stator 3 among the magnetic fluxes generated when the windings 7, 7 are energized.
A torque is generated by the magnetic flux traveling from a to the tip of the salient pole 2a of the rotor 2.

On the other hand, as shown in FIG.
Other than the tip of the salient pole 2a, ie, the salient pole 2a of the rotor 2.
Salient poles 2a, 2a of the rotor 2 adjacent to each other
The magnetic flux heading toward the salient pole portion, which is a portion between the two, is a leak magnetic flux, and the leak magnetic flux does not contribute to the generation of torque at all, or its contribution is small. In addition, the leakage magnetic flux increases the inductance of the winding, so that the current responsiveness is deteriorated. In particular, in a high rotation speed region, a desired current cannot be supplied to the winding, and the torque decreases.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has as its object to improve the output of a motor.

[0012]

(1) In order to achieve the above object, a motor according to the present invention according to claim 1 has a stator having a plurality of salient poles projecting inward, and each of the salient poles of the stator. And a rotor provided inside the stator having a plurality of salient poles protruding outwardly, wherein both sides of the salient poles of the rotor and between the salient poles of the rotor are provided. When there is a portion, a magnetic flux shielding portion made of a non-magnetic and conductive material is provided in the portion between the salient poles.

According to the motor of the first aspect of the present invention, since the magnetic flux shielding portions are provided on both sides of the salient poles of the rotor and possibly between the salient poles, of the magnetic flux generated by energizing the windings, In addition, leakage magnetic flux that does not pass through a desired path is reduced. That is, when the leakage magnetic flux toward the magnetic flux shielding portion is to be increased, an eddy current is generated in the magnetic flux shielding portion,
Since this eddy current flows in a direction that hinders the change of the magnetic flux,
The magnetic flux passing through this part decreases. As a result, the leakage magnetic flux is reduced, the magnetic flux in the portion that is originally supposed to pass (the tip of the salient pole of the rotor) increases, and the increase in the inductance of the winding due to the leakage magnetic flux can be suppressed.
Therefore, the generated torque can be increased,
The output of the motor can be improved.

In particular, according to the first aspect of the present invention, since the magnetic flux shielding portions are provided on both sides of the salient poles of the rotor, the generation of torque is not dependent on the rotation direction of the rotor. When the rotation direction is not limited to one direction (such as when the same characteristics are required in forward and reverse rotation) or when used as a generator motor (when the same characteristics are required as a motor and a generator)
It is especially effective.

(2) To achieve the above object, a second aspect is provided.
The motor according to the present invention includes a stator having a plurality of salient poles projecting inward, a winding wound around each of the salient poles of the stator, and a stator having a plurality of salient poles projecting outward. And a rotor provided on the inside, wherein any one of both side portions of the salient poles of the rotor and a portion between the salient poles in the rotor have a non-magnetic and A magnetic flux shielding part made of a conductive material is provided.

According to the motor of the second aspect of the present invention, the magnetic flux shielding portion is provided at one of the two side portions of the salient poles of the rotor and optionally at the portion between the salient poles. Similarly to the above, among the magnetic fluxes generated by energizing the windings, the leakage flux that does not pass through the desired path is reduced.

In particular, according to the second aspect of the present invention, since the magnetic flux shielding portion is provided on one of the side portions of the salient pole of the rotor and is not provided on the other, the torque can be further increased. That is, the magnetic flux passing through one of the two sides of the salient pole of the rotor passes through the tip of the salient pole of the rotor in relation to the use of the motor (motor or generator) and the direction of rotation. Although it is not as large as a magnetic flux, it may contribute to the generation of torque.

For example, in motor applications, the magnetic flux passing through the salient poles of the rotor on the downstream side with respect to the rotation direction of the rotor is smaller than the magnetic flux passing the tip of the salient poles of the rotor. No, but can contribute to the generation of torque. Conversely, in generator applications, the magnetic flux passing through the side of the rotor on the upstream side with respect to the rotational direction of the rotor among the both sides of the salient pole of the rotor is more likely to be the magnetic flux passing through the tip of the salient pole of the rotor. However, it can contribute to generation of torque (in this case, negative torque).

Therefore, of both side portions of the salient pole of the rotor, a magnetic flux shielding portion is provided on the one side which does not contribute to the generation of torque, and no magnetic flux shielding portion is provided on the other side which contributes to the generation of torque. Thereby, the torque can be further increased.

(3) In order to achieve the above object, a third aspect is provided.
The motor according to the present invention is characterized in that, in the motor according to the first or second aspect, the magnetic flux shielding portion is made of a nonmagnetic conductive film formed by vapor deposition or plating on the surface of the rotor.

Since this film forming method is easy, the number of manufacturing steps for providing the magnetic flux shielding portion can be reduced.
In addition, the magnetic flux shielding portion has good integration with the rotor, and can be applied to a high-speed rotation motor.

(4) In order to achieve the above object, a fourth aspect is provided.
The motor according to the present invention is the motor according to claim 1 or 2, wherein the non-magnetic conductive plate formed along the surface of the rotor and the convex portion are fitted on one of the rotor and the convex portion on the other. The magnetic flux shielding part is made of the nonmagnetic conductive plate attached to the rotor by fitting the convex part and the concave part.

According to the motor of the fourth aspect of the present invention,
Since the magnetic flux shielding portion is made of a non-magnetic conductive plate, it can cope with a case where a relatively large thickness is required in order to realize a sufficient shielding effect as a magnetic flux shielding portion, without limitation. Since the non-magnetic conductive plate is attached to the rotor by fitting the
It has good integration with the rotor and can be applied to a high-speed rotation motor.

(5) In order to achieve the above-mentioned object, the present invention is characterized in that:
In the motor according to the present invention, in the motor according to claim 1 or 2, the magnetic flux shielding portion forms a slit-shaped hole in the rotor so as to be slightly apart from the surface of the rotor and along the surface. The hole is filled with the non-magnetic and conductive material.

According to the motor of the present invention described in claim 5,
Since the thickness of the magnetic flux shielding portion is determined by the width of the slit-shaped hole of the rotor, the thickness of the magnetic flux shielding portion can be made uniform, and by adjusting the width of the slit-shaped hole, the magnetic flux shielding portion can be formed. The thickness of the portion can be easily and precisely adjusted. In addition, it has good integration with the rotor, and can be applied to a high-speed rotation motor.

(6) In order to achieve the above object, a sixth aspect of the present invention is provided.
The described starter generator of the present invention includes a stator having a plurality of salient poles projecting inward, a winding wound around each of the salient poles of the stator, and a plurality of salient poles projecting outward. A rotor provided inside the stator, wherein the rotor is connected to a crankshaft of the engine, and functions as a starter at the time of starting the engine, and as a generator after starting, if necessary, When the rotor has a salient pole portion between both sides of the salient pole of the rotor with respect to the rotation direction of the rotor and the salient pole portion, the salient pole portion is made of a non-magnetic and conductive material. A magnetic flux shielding portion.

According to the starter generator of the present invention, the magnetic flux is applied to the side of the salient poles of the rotor downstream of the rotating direction of the rotor and possibly to the portion between the salient poles. Since the shielding portion is provided, the leakage magnetic flux that does not pass through the desired path among the magnetic fluxes generated by energizing the windings is reduced, as in the first or second aspect.

In particular, when functioning as a generator, not only the magnetic flux passing through the tip of the salient pole of the rotor, but also the magnetic flux passing through the side on the upstream side in the rotation direction of the salient pole. Although it can contribute to the generation of torque (in this case, negative torque), since the magnetic flux shielding portion is not provided on the upstream side, the torque is increased and the output is increased accordingly.

On the other hand, when functioning as a starter (electric motor), assuming that the rotation direction is the same, on the contrary, the magnetic flux passing through the downstream side portion also contributes to the generation of torque. Since the magnetic flux shielding portion is provided on the downstream side, there is a concern that the torque may be reduced accordingly. However, when the engine is started, the rotation speed of the rotor is low and the speed of change of the magnetic flux is low. Therefore, the shielding effect provided by the magnetic flux shielding portion provided on the downstream side is low, and the efficiency does not decrease so much. Therefore,
An overall high performance starter generator is provided.

[0030]

(1) According to the first aspect of the present invention, since the magnetic flux shielding portions are provided on both sides of the salient poles of the rotor and in some cases between the salient poles, a motor having a large output can be provided. it can. In particular, when the rotor is required to have almost the same performance in both forward and reverse directions, or when the application is not limited and almost the same performance is required for both a motor and a generator, excellent performance is required. Can be provided.

(2) According to the second aspect of the present invention, since the magnetic flux shielding portion is provided at any one of the salient poles of the rotor and in some cases between the salient poles, a motor having a large output can be provided. . Particularly, when the rotation direction or the main rotation direction of the rotor is constant or when one of the outputs is to be preferentially increased in the forward rotation and the reverse rotation, or when the use (motor, generator) is limited or there is a main use, the present invention is excellent. A motor having high performance can be provided.

(3) According to the third aspect of the present invention, in addition to the above-described effects of the first or second aspect, in addition to a small work load for providing a magnetic flux shielding portion, a motor suitable for high-speed rotation is provided. can do.

(4) According to the fourth aspect of the present invention, in addition to the effect of the first or second aspect, the thickness of the magnetic flux shielding portion can be made relatively large and suitable for high-speed rotation. Motor can be provided.

(5) According to the fifth aspect of the present invention, in addition to the above-described effects of the first or second aspect, the thickness of the magnetic flux shielding portion can be easily and accurately adjusted, and the rotation speed can be increased. It can be applied to motors.

(6) According to the sixth aspect of the present invention, it is possible to provide a starter generator which has a small decrease in performance when starting the engine and has a large output during power generation.

[0036]

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

[0037] First Embodiment FIG. 1 is a plan view showing an important part of a first embodiment of the SR motor (switched reluctance motor) according to the present invention. The SR motor 1 according to the first embodiment is a three-phase SR motor in which the number of salient poles of the stator is six and the number of salient poles of the rotor is four.

The SR motor 1 includes a rotor 2 as a rotor, a stator 3 as a stator, and a motor housing (not shown) for accommodating them.

A plurality of rotors 2 (four in this embodiment)
An output shaft (shaft) 5 is inserted into a through hole formed at the center of the rotor core having the salient pole 2a, and is integrally fixed. The output shaft 5 is supported by a motor housing via a bearing. I have. In this embodiment, the rotor core is configured by stacking and integrating a plurality of magnetic steel sheets (an insulating film is formed on both surfaces thereof) punched by a press device.

The stator 3 includes a stator core and a plurality of winding coils 7. The stator core is integrally provided with a plurality (six in this embodiment) of salient poles 3a projecting in the radial direction inside a substantially cylindrical yoke portion. In this embodiment, the stator core is configured by laminating and integrating a plurality of magnetic steel plates (an insulating film is formed on both surfaces thereof) punched by a press device. The stator 3 is fixed inside the motor housing.

The rotor 2 is coaxially inserted and arranged so as to have a predetermined gap with the salient pole 3a of the stator 3. Winding coils 7 wound around bobbins (not shown) are mounted on the salient poles 3a of the stator 3, respectively. The bobbin is a member having a U-shaped cross section and a rectangular ring shape, and is formed of an insulating material such as resin. A winding coil 7 is wound around a portion between both side walls of the bobbin, and a salient pole 3
a is fixed to the salient pole 3a by being inserted or fitted.

Each salient pole 2 of the rotor 2 in this embodiment
Non-magnetic conductive films (magnetic flux shielding portions) 9a, 9b and 9c are formed on the surfaces of both side portions of a and the portion between the salient poles (the portion between the salient pole 2a and the adjacent salient pole 2a). I have. The nonmagnetic conductive films 9a, 9b, 9c are formed by evaporating aluminum in this embodiment. However, copper plating or another non-magnetic conductive material may be formed by vapor deposition, plating, or another film forming method.

An electric current is caused to flow through a pair of winding coils 7 facing each other, so that the salient poles 3a of the stator 3
A magnetic flux is generated toward the a, and the salient pole 2a of the rotor 2 existing in the vicinity thereof is attracted to generate a torque. When the salient poles 2a, 3a of the stator 3 and the rotor 2 are opposed to each other, the other salient poles 2a, 3a are displaced from each other. , The salient poles 2a of the rotor 2 are continuously attracted, and the rotor 2 can be rotated around the axis.

When the winding coil 7 is energized, a magnetic flux (main magnetic flux) is generated from the salient poles 3a of the stator 3 toward the tip of the salient poles 2a of the rotor 2, and a magnetic flux is generated between the side portions of the salient poles 2a and the salient poles. Magnetic flux (leakage magnetic flux) is generated toward the part,
Non-magnetic conductive films 9 b and 9 are provided on both sides of the salient pole 2 a of the rotor 2.
Since the non-magnetic conductive film 9a is formed in the portion between the salient poles, a vortex is formed in the films 9a, 9b, 9c with the change in the magnetic flux passing through the non-magnetic conductive films 9a, 9b, 9c. Since an electric current is generated and the eddy current flows in a direction that hinders the change of the magnetic flux, the magnetic flux is guided to the tip of the salient pole 2a of the rotor 2 by the presence of the nonmagnetic conductive films 9a, 9b, and 9c.

As a result, the magnetic flux effectively contributing to the generation of the rotation torque can be increased, and the torque of the SR motor 1 can be improved. In particular, the increase of the torque becomes remarkable in a high rotation range where the magnetic flux changes sharply.

Here, the SR motor 1 of the first embodiment
Are non-magnetic conductive films (magnetic flux shielding portions) 9b in addition to the non-magnetic conductive films (magnetic flux shielding portions) 9a formed in the portions between the salient poles.
9c is provided on each side of the salient pole 2a of the rotor 2, so that there is no dependence of the performance on the direction of rotation of the rotor 2 and almost the same performance regardless of whether the rotor 2 is rotated in the forward or reverse direction. Can be realized. Further, in any of the cases where the motor is used as a generator, or as a generator motor, there is no dependency on performance depending on these uses, and versatility is high.

Further, since the magnetic flux shielding portion is constituted by the non-magnetic conductive films 9a, 9b, 9c, it is easy to manufacture the magnetic flux shielding portion, and the shape of the rotor 2 is not processed to provide the magnetic flux shielding portion. Therefore, there is no adverse effect on the main magnetic flux.

Although not particularly limited, an insulating film is formed on both sides of the salient pole 2a of the rotor 2 and on the surface of the portion between the salient poles, and nonmagnetic conductive films 9a, 9b, 9 are formed on the surface of the insulating film.
It is desirable to form c. Without such an insulating film,
In the salient pole 2a, the adjacent laminated steel sheets are conducted by the nonmagnetic conductive films 9b and 9c present on both sides thereof, and an eddy current is generated so as to go around the non-magnetic conductive films 9b and 9c. In some cases, by forming such an insulating film, this can be prevented.

The motor output can be further improved by forming a similar non-magnetic conductive film on one or both end faces of the rotor 2 in the direction along the axis 5 of the rotor core. Although the effect is slightly inferior to that of the first embodiment, the nonmagnetic conductive films 9c and 9b are not formed on both sides of the salient poles 2a of the rotor 2, and only the portion between the salient poles is formed. By forming the film 9a, the motor output can be improved though not as much as in this embodiment.

Second Embodiment FIG. 2 is a plan view showing a main part of a second embodiment of the SR motor according to the present invention. Components that are substantially the same as those in the above-described first embodiment are given the same numbers, and descriptions thereof are omitted.

In the first embodiment described above, in addition to the nonmagnetic conductive film 9a between salient poles, the nonmagnetic conductive films 9b and 9c are formed on both sides of the salient pole 2a of the rotor 2, respectively. On the other hand, in the second embodiment, the salient poles 2 of the rotor 2
The difference is that the non-magnetic conductive film 9b is formed only on one of the two side portions of a and the non-magnetic conductive film (corresponding to the non-magnetic conductive film 9c of the first embodiment) is not formed on the other.

When the characteristics of a motor for an electric motor are such that the motor can rotate in both forward and reverse directions and the same performance is required in the forward and reverse rotation directions, the SR motor described in the first embodiment is preferable. Is as described above.

However, a fan motor, a pump motor, or the like is used only for one-way rotation, or a forward motor is frequently used in a drive motor of an electric vehicle, and a reverse drive during reverse is slight. In a servo motor or the like, it may be desirable that there be a difference in torque between forward rotation and reverse rotation. That is, in a motor having the same size, it is sometimes useful to have superior forward rotation characteristics even at the expense of reverse rotation, rather than having performance equal to both forward and reverse rotations.

The SR motor according to the second embodiment is particularly suitable for such a case. That is, in FIG. 2, of the two side portions of the salient pole 2 a of the rotor 2, the rotor 2 passes through the side portion on the downstream side with respect to the rotation direction of the rotor 2 (clockwise in FIG. The magnetic flux M is the salient pole 2 of the rotor 2
It can contribute to the generation of torque, though not as much as the magnetic flux passing through the tip of a.

Therefore, on the both sides of the salient pole 2a of the rotor 2 on the downstream side with respect to the rotation direction, the one corresponding to the nonmagnetic conductive film 9c in the above-described first embodiment is not formed, and The non-magnetic conductive film 9b is formed on the side portion of the rotor 2 and the non-magnetic conductive film 9a is formed on the portion between the salient poles. As a result, torque is also generated by the magnetic flux induced to the side portion, so that the output can be further improved.

In the case of a generator application, the relationship is opposite to that of the motor application described above. That is, the salient pole 2 of the rotor 2
The magnetic flux passing through the side of the rotor 2 on the upstream side with respect to the rotational direction of the rotor 2 is not as large as the magnetic flux passing through the tip of the salient pole 2a of the rotor 2 but has a torque (in this case, a negative torque). ).

Therefore, a non-magnetic conductive film (corresponding to the non-magnetic conductive film 9c of the first embodiment) is formed on the side of the rotor 2 on the downstream side in the rotation direction among the both sides of the salient pole 2a.
By not forming a nonmagnetic conductive film (corresponding to the nonmagnetic conductive film 9b) on the upstream side portion that contributes to the generation of the torque, the torque can be further increased.

In the first embodiment, the rotor 2
In order to prevent eddy currents from being generated by conducting both sides of the magnetic steel sheet constituting the above by the non-magnetic conductive film, an insulating film is interposed. However, in the second embodiment,
Although one side of the salient pole 2a of the rotor 2 is electrically connected by the non-magnetic conductive film 9b, the other side is not electrically connected, so that the generation of the eddy current is suppressed, and as in the first embodiment. This is advantageous in that a simple insulating film is not necessarily required. However, an insulating film may be interposed between the rotor 2 and the nonmagnetic conductive films 9a and 9b.

Third Embodiment FIG. 3 is a plan view showing a main part of a third embodiment of the SR motor according to the present invention. Components that are substantially the same as those in the above-described first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted.

In the first and second embodiments described above, the magnetic flux shielding portion is formed by forming the nonmagnetic conductive films 9a, 9b, 9c or 9a, 9b on a predetermined portion of the rotor 2. The third embodiment is different from the third embodiment in that a magnetic flux shielding portion is formed by attaching nonmagnetic conductive plates 10a and 10b to a predetermined portion of the rotor 2.

The non-magnetic conductive plate 10a is made of a non-magnetic and conductive material (a cross-section (a surface orthogonal to the center axis of the rotor) formed in an arc shape along the portion between the salient poles of the rotor 2. This is a plate made of aluminum, copper, or the like), and integrally has a plurality (a pair in the figure) of protrusions 11a on the inner surface on the rotor 2 side. The convex portion 11a extends in the vertical direction along the central axis, and has a trapezoidal cross section so that the size of the distal end portion is larger than the base end portion.

The non-magnetic conductive plate 10 b is
a plate made of a non-magnetic and conductive material (aluminum, copper, or the like) formed in a rectangular shape along one side of a, and a plurality of pairs (a pair in FIG. Of the projection 11b are integrally formed. This convex portion 11b
Like the convex portion 11a of the nonmagnetic conductive plate 10a, it extends in the vertical direction, and has a trapezoidal cross section so that the size of the tip portion is larger than the base portion.

On the surface on the upstream side with respect to the portion between the salient poles of the rotor 2 and the rotation direction (clockwise in FIG. 3) of the salient poles 2a,
Recesses (grooves) into which the pair of projections 11a and 11b can be fitted are formed, and the nonmagnetic conductive plates 10a and 10b are formed.
The nonmagnetic conductive plates 10a, 10b are attached to predetermined portions of the rotor 2 by fitting the convex portions 11a, 11b of the rotor 2 into the corresponding concave portions of the rotor 2. In this embodiment,
An adhesive is further applied between the non-magnetic conductive plates 10a and 10b and the rotor 2 to further secure the fixing.

In this embodiment, the non-magnetic conductive plates 10a,
10b used what was constituted independently, respectively,
It may be formed integrally. The non-magnetic conductive plate 1
0b is connected to the salient poles 2 of the rotor 2.
The non-magnetic conductive plate 10b on the downstream side with respect to the rotation direction of a may be additionally provided, or after the non-magnetic conductive plate 10b on the upstream side is eliminated.

According to the third embodiment, since the magnetic flux shielding portion is constituted by the nonmagnetic conductive plates 10a and 10b, a relatively large thickness is required to realize a sufficient shielding effect as the magnetic flux shielding portion. Since the non-magnetic conductive plates 10a and 10b are attached to the rotor 2 by fitting the convex portions 11a and 11b into the concave portions, the non-magnetic conductive plate 10
a, 10b has good integration and can be applied to a high-speed rotation motor. In particular, the protrusions 10a and 10b have a trapezoidal cross section so that the size of the distal end portion is larger than that of the base end portion, and the concave portion is shaped to fit into the trapezoidal portion, so that the fixing is reliable.

In the third embodiment, the protrusions 11a and 11b are provided on the nonmagnetic conductive plates 10a and 10b.
The recesses are formed on the rotor 2 as shown in FIG. 4, but the protrusions 1a and 11b are similar to the protrusions 1a and 11b.
The recesses 2a and 12b may be formed in the non-magnetic conductive plates 10a and 10b so as to be fitted therein. By doing so, it is possible to reduce the adverse effect on the main magnetic flux passing through the rotor 2.

Fourth Embodiment FIG. 5 is a plan view showing a main part of a fourth embodiment of the SR motor according to the present invention. Components that are substantially the same as those in the above-described first to third embodiments are denoted by the same reference numerals, and description thereof will be omitted. The SR motor according to the fourth embodiment is an electric motor or a generator motor whose main use is an electric motor.

In the fourth embodiment, slit-like holes 13a and 13b are formed inside the rotor 2 and along the surface of the rotor 2 while keeping a predetermined gap from the surface of the rotor 2.
The holes 13a and 13b are filled (injected) with a non-magnetic and conductive material such as aluminum or copper to form a magnetic flux shielding portion made of a non-magnetic conductor. Is different from Hole 13 of non-magnetic conductive material
Filling into a and 13b can be performed using a method such as vapor deposition or plating. Since this motor is a motor or a generator motor whose main application is a motor, a magnetic flux shielding portion (13b) is provided on the side of the rotor 2 on the upstream side with respect to the rotation direction of the salient pole 2a.

Since the thickness of the magnetic flux shielding portion is determined by the width of the slit-shaped holes 13a and 13b of the rotor 2, the thickness of the magnetic flux shielding portion can be made uniform and the slit-shaped holes 13a and 13b can be made uniform. By adjusting the width, the thickness of the magnetic flux shielding portion can be adjusted with high accuracy, and the manufacturing variation in performance is small. Further, the integration with the rotor 2 is extremely good, and it can withstand high-speed rotation sufficiently, and the performance is hardly deteriorated with time.

Although a part of the rotor 2 is processed (slit-shaped holes 13a and 13b are formed), as shown in FIG. There are few adverse effects.

Fifth Embodiment FIG. 7 is a plan view showing a main part of a fifth embodiment of the SR motor according to the present invention, and FIG. 8 is a partially enlarged view of FIG. Components that are substantially the same as those of the above-described first to fourth embodiments are denoted by the same reference numerals, and description thereof will be omitted. The SR motor according to the fifth embodiment is a generator or a generator motor whose main use is a generator.

In the fifth embodiment, similarly to the above-described fourth embodiment, a slit-like hole 13a is provided inside the rotor 2 so as to keep a predetermined gap from the surface of the rotor 2 and along the surface. Is formed, and the hole 13a is filled (injected) with a non-magnetic and conductive material such as aluminum or copper to form a magnetic flux shielding portion 14 made of a non-magnetic conductor. However, since the generator or the main use is a generator motor, which is a generator, the slit-like hole 13b as in the above-described fourth embodiment is not provided, and the rotor 2 is located downstream with respect to the rotation direction of the salient pole 2a. The fourth embodiment differs from the above-described fourth embodiment in that a similar slit-shaped hole 13c is provided in the side portion on the side, and a nonmagnetic and conductive material is filled in the hole 13c to form a magnetic flux shielding portion.

The SR motor according to the fifth embodiment has, in particular,
It is suitable for use as a starter generator of an engine for a vehicle or the like. Although not shown, the starter generator has a rotating shaft 5 of the rotor 2 connected to a crankshaft of the engine via a clutch, a speed reducer, or the like, and functions as a starter (power machine) when the engine is stopped. A generator (generator) that starts the engine and converts the rotation of the crankshaft into electric power if necessary after the start
It is a device that functions as

When functioning as a generator, not only the magnetic flux passing through the tip of the salient pole 2a of the rotor 2 but also the
The magnetic flux passing through the side portion on the upstream side with respect to the rotation direction of the salient pole 2a can also contribute to the generation of torque (in this case, negative torque), but the magnetic flux shielding portion is not provided on the side portion on the upstream side. Therefore, the torque is increased and the output is increased accordingly.

On the other hand, when functioning as a starter,
Contrary to the above, the magnetic flux passing on the downstream side with respect to the rotation direction of the salient pole 2a of the rotor 2 also contributes to the generation of the torque, but the downstream side has a magnetic flux shielding portion 14 (13c). Is provided, there is a concern that the torque is reduced accordingly. However, when the engine is started, the rotation speed of the rotor 2 is low and the speed of change of the magnetic flux is low. Therefore, the shielding effect provided by the magnetic flux shielding portion provided on the downstream side is low, and the efficiency does not decrease so much. . Therefore, the starter generator has a high performance as a whole.

The embodiments described above are described for facilitating the understanding of the present invention, and are not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

For example, in the above-described embodiment, a case where the present invention is applied to the SR motor has been described.
Other types of motors can be applied. Further, the number of salient poles and the number of phases of the stator and the rotor are not limited to those in the above-described embodiment, and the other embodiments can be applied in the same manner.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main part of a first embodiment of an SR motor according to the present invention.

FIG. 2 is a plan view showing a main part of a second embodiment of the SR motor according to the present invention.

FIG. 3 is a plan view showing a main part of a third embodiment of the SR motor according to the present invention.

FIG. 4 is a plan view showing a main part of a third embodiment of the SR motor according to the present invention, which is partially modified.

FIG. 5 is a plan view showing a main part of a fourth embodiment of the SR motor according to the present invention.

FIG. 6 is a plan view showing a flow of a main magnetic flux in the configuration of a fourth embodiment of the SR motor according to the present invention.

FIG. 7 is a plan view showing a main part of a fifth embodiment of the SR motor according to the present invention.

8 is an enlarged view of a part of FIG. 7;

FIG. 9 is a plan view showing a conventional technique.

FIG. 10 is a plan view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... SR motor 2 ... Rotor 2a ... Salient pole 3 ... Stator 3a ... Salient pole 5 ... Output shaft 7 ... Winding coil 9a, 9b, 9c ... Non-magnetic conductive film 10a, 10b ... Non-magnetic conductive plate 11a, 11b, 12a , 12b... Convex portions 13a, 13b... Slit-shaped holes 14.

Claims (6)

[Claims] 1. A stator having a plurality of salient poles projecting inward, a winding wound around each of the salient poles of the stator, and a stator provided inside the stator having a plurality of salient poles projecting outward. A magnetic flux composed of a non-magnetic and conductive material at both sides of the salient poles of the rotor and, if the rotor has a portion between salient poles, at a portion between the salient poles. A motor provided with a shielding part. 2. A stator having a plurality of salient poles projecting inward, a winding wound around each of the salient poles of the stator, and a stator provided inside the stator having a plurality of salient poles projecting outward. And a rotor provided with a non-magnetic and conductive material, if any one of the side portions of the salient poles of the rotor and the rotor has a portion between the salient poles. A motor provided with a magnetic flux shielding portion made of a material. 3. The motor according to claim 1, wherein the magnetic flux shielding portion is formed of a non-magnetic conductive film deposited or plated on the surface of the rotor. 4. A non-magnetic conductive plate formed along the surface of the rotor and a concave portion in which one of the rotors is fitted with a convex portion and the other is fitted with the convex portion. The motor according to claim 1, wherein the motor is made of the nonmagnetic conductive plate attached to the rotor by fitting a portion with the recess. 5. The magnetic flux shielding portion forms a slit-shaped hole in the rotor so as to be slightly apart from and along the surface of the rotor, and the nonmagnetic and conductive material is formed in the hole. 3. The motor according to claim 1, wherein the motor is filled. 6. A stator having a plurality of salient poles protruding inward, a winding wound on each of the salient poles of the stator, and a stator provided inside the stator having a plurality of salient poles protruding outward. A starter generator which is connected to a crankshaft of an engine, and functions as a starter when the engine is started, and as a generator after the start if necessary, comprising a salient pole of the rotor. When there is a salient pole portion on the downstream side of the rotor in the rotation direction of the rotor and a salient pole portion in the rotor, a magnetic flux shielding portion made of a non-magnetic and conductive material is provided on the salient pole portion. A starter generator characterized by being provided.