JP2002199676A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the utilization efficiency of a magnetic pole by increasing the overlapped angle of the magnetic pole of a stator and the magnetic pole of a rotor for generating torque. SOLUTION: The stator is provided with a plurality of magnetic poles extending in the axial direction along the circumferential face opposite to the rotor and a plurality of slots formed between the adjacent magnetic poles, and forms a plurality of phases by grouping a plurality of coils wound in the axial direction between the slots every the plurality of the slots in regard to the circumferential direction. The rotor is provided with a plurality of magnetic materials arranged magnetically independently in the circumferential direction respectively along the circumferential face for the stator, magnetically couples a plurality of the magnetic poles when a magnetic materials structure is opposed to the plurality of the magnetic poles continued in the circumferential direction, generates rotating torque in the rotor by the magnetic flux of a magnetic closed path generated between the plurality of magnetic poles and the magnetic material structure when they are energized to each phase, and the energizing polarity of the coil wound on the adjacent slot in regard to the circumferential direction is equal in the different coil grouped on one phase.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor, for example, a switched reluctance type motor (hereinafter, referred to as an SR motor) used for an electric vehicle or the like.

[0002]

2. Description of the Related Art FIG. 7 is a view showing a stator and a rotor of a conventional SR motor. SR motor is a cylindrical stator 1
And a columnar rotor 2 that rotates coaxially in the space inside the stator 1, and the rotor 2 is attached to a shaft 3. This SR motor has three phases, and the stator 1 has six phases.
The poles and the rotor 2 have four poles, and both the stator 1 and the rotor 2 are made of a magnetic material, and are made of silicon steel sheets stacked in the axial direction.

[0003] The stator 1 has an inner circumference of 60 °.
Six magnetic poles (polar portions) Sa, Sb, Sc, Sd, Se, and Sf projecting inward are formed at shifted positions, and each of the magnetic poles Sa to Sf has an exciting coil La to Sf.
Lf is wound, and the connection of each of the coils La to Lf and the direction of current flow are as shown in FIG.

On the other hand, the rotor 2 is provided with
Four magnetic poles Ra, Rb, Rc, Rd projecting outward are formed at positions shifted by 0 °.

FIG. 8 is a diagram showing the basic structure and operation principle of the SR motor shown in FIG. 7 including windings. In FIG. 8, a current is sequentially passed through each of the coils corresponding to the position of the rotor 2 so that the facing stator 1
The magnetic flux is transferred between the magnetic poles of the rotor 2 and the magnetic poles of the rotor 2, the magnetic poles of the rotor 2 are attracted to the magnetic poles of the stator 1, and the rotor 2 rotates to generate torque. The coils shown in FIG. 8 are coils (La and Ld, Lb and L in FIG. 7) wound around the magnetic poles of the stator 2 facing each other.
e, Lc and Lf).

The position of the rotor 2 is detected by a position sensor (not shown) attached to the rotor 2, and a state 1 in which a current flows through the coil 2 → a state 2 in which a current flows through the coil 3 → a state 3 in which a current flows through the coil 3 → State 1 in which current flows through the coil
The operation involved in energizing different coils, such as..., Is referred to as a step. This operation principle is also applied to the present invention.

FIG. 9 is a diagram showing the inductance of the coil, the current supplied to the coil, and the torque generated in the motor for one phase. As is clear from FIG. 9, the inductance of the coil gradually increases from the minimum value as the certain magnetic pole of the stator 1 and the certain magnetic pole of the rotor 2 at the unaligned position indicated by θu approach each other as the rotor 2 rotates. Go. When a current that changes a, b, c, and d flows through the coil in parallel with the rotation of the rotor 2, torque as a motor is generated. The inductance is maximized at a position where the magnetic poles of the stator 1 and the rotor 2 face each other, that is, at the aligned position. The inductance value of the coil becomes substantially flat around the alignment position. After the inductance becomes maximum, the inductance decreases as the magnetic poles of the rotor 2 move away from the magnetic poles of the stator 1 as the rotor 2 rotates, and the magnetic poles of the stator 1
Shows the minimum value of the inductance at the position farthest from the magnetic pole. This is also the unaligned position.

FIG. 10 shows the magnetization curve of the SR motor, the horizontal axis shows the current flowing through the coil, and the vertical axis shows the flux linkage interlinking the coil. In FIG. 10, when the magnetic pole of the rotor 2 is farthest from the magnetic pole of the stator 1, the value of the inductance decreases, and as the magnetic pole of the rotor 2 approaches the magnetic pole of the stator 1, the inductance increases, and after the inductance becomes maximum. In addition, the inductance reaches a plateau due to the magnetic saturation of the iron material, and the characteristics become almost flat.

The area surrounded by the flux linkage of the coil at the alignment position θA, the flux linkage at the unaligned angle θu, and the current line Im is magnetic energy. The magnetic energy is W, and the rotor 2 makes one rotation. If the current is switched Nst times during this time, the average torque TA of the SR motor is W × N
It is represented by st / 2π. In order to increase the average torque TA, the magnetic energy W may be increased, or the number Nst of times of energization switching per rotation may be increased. In the latter case, in order to increase the number of switching Nst, the number of magnetic poles of the stator 1 and the rotor 2 may be increased, or the number of phases of the coil may be increased. The number of magnetic poles can be increased, for example, by combining 12 magnetic poles of the stator 1, 8 magnetic poles of the rotor 2, or 18 magnetic poles of the stator 1 and 12 magnetic poles of the rotor 2. When the number of magnetic poles is increased, the magnetic energy W is also reduced in proportion thereto, so that the average torque TA is not increased. Also, an increase in the number of phases is not preferable because it causes an increase in the size of the drive circuit and an increase in the size of the motor due to an increase in wiring from the motor. Therefore, it is essentially necessary to increase the magnetic energy W per step.

As concrete means for increasing the magnetic energy W, (1) increase in unsaturated alignment inductance on the magnetization curve (2) increase in maximum interlinkage magnetic flux (3) decrease in unaligned inductance (4) inflection point It is necessary to increase the linkage flux. These characteristics are calculated using the following basic equations.

(1) Unsaturated alignment inductance La La = μo × S1 × N ² × A / LG where μo is the magnetic permeability of vacuum, and S1 is the stator coil 1
And the overlap area of the rotor 2, N is the number of turns of the coil,
A is the number of magnetic poles around which the coil is wound, and LG is the air gap length between the rotor 2 and the stator 1. (2) Maximum interlinkage magnetic flux Pm Pm = S2 × Bm × N × A where S2 is the magnetic path. Magnetic path cross section at Bm
Is the maximum magnetic flux density. (3) Unaligned inductance Lu Lu = k × N ² × C where k is a leakage inductance constant between magnetic poles (slots) of adjacent rotors 2, C is the number of slots (4) Inflection Point linkage flux Ps Ps = Bs × LG / (μo × N) Here, Bs is the saturation magnetic flux density. Optimizing the above-described parameters is an essential requirement at the time of design. For example, the number of turns N of the coil is increased. It is possible to do. As the number of turns N increases, the unsaturated align inductance La and the maximum interlinkage magnetic flux Pm increase, which contributes to an increase in the magnetic energy W, as is clear from the above calculation formula. However, as is clear from the calculation formula, the unaligned inductance Lu to be reduced also increases, so that the inflection point interlinkage magnetic flux Ps to be increased decreases.
The increase in the unaligned inductance Lu hinders the rise of current at the time of high-speed rotation of the motor (at the highest drive frequency), and causes a problem that the generated torque of the motor at high-speed rotation is reduced.

[0012] Further, as long as the arrangement space of the coil is the same, the resistance value of the coil increases in proportion to the square of the number of turns, so that the motor has a large power loss (copper loss) of the coil. Increasing the number of turns of the coil in this way can contribute to an increase in the generated torque at the time of low-speed rotation of the motor, but deteriorates the performance and efficiency at high-speed rotation.

On the other hand, as means for increasing the non-saturated unaligned inductance La and the maximum linkage flux Pm, a method of increasing the overlap area S1 of the stator 1 and the rotor 2 and the minimum magnetic path cross-sectional area S2 in the magnetic path is used. There is. Further, as means for reducing the inductance Lu during unalignment, the distance between the magnetic poles (between the magnetic poles of the stator 1,
There is a method of increasing the distance between the magnetic poles of the rotor 2 and the magnetic poles of the stator 1 and the rotor 2). However, the conventional motor has significant structural limitations as described below, and the motor must be increased in size to form a motor with a large generated torque and a small copper loss.

[0014]

FIG. 11 shows the stator magnetic pole angle and the rotor magnetic pole angle from the center of the motor, and FIG. 12 shows the relationship between the stator magnetic pole angle and the rotor magnetic pole angle. Figures 11 and 12 show Switched Reluctance Motors and their Control as references.
(TJEMiller. MAGNA PHYSICS PUBLISHING). This document includes the triangle A in FIG.
It is said that it is better to set the rotor magnetic pole angle and the stator magnetic pole angle within the angle of the area represented by BC, however, when the generated torque, output, efficiency, and torque ripple of the motor are comprehensively considered, general The practical range is that the rotor magnetic pole angle and the stator magnetic pole angle are in the range of 30 ° to 36 °. That is, in the conventional SR motor, the rotor 1
The ratio of the overlapping angle of the stator and the rotor per rotation (360 °) is 8.33 to 10%.

It can be said that this ratio is a factor limiting the performance of the conventional SR motor. This is stator 1
However, even if the number of magnetic poles of the rotor 2 is increased, the ratio of the overlap angle does not change, so that it is not a solution.
Conversely, if the number of magnetic poles of the stator 1 and the rotor 2 is carelessly increased, the length of the magnetic poles at the time of unalignment becomes shorter, the leakage magnetic flux increases, and the number of slots in which windings are formed increases. This causes an increase in the alignment inductance, and consequently there is a limit in increasing the torque.

Furthermore, the magnetic pole of each phase contributes to the generation of inductance when the phase is energized.
When the other phases are energized, they do nothing and are not being used effectively.

Therefore, a main object of the present invention is to increase the overlap angle between the magnetic pole of the stator and the magnetic pole of the rotor for generating torque to improve the utilization efficiency of the magnetic poles.

[0018]

Means for Solving the Problems In order to solve the above problems, the invention according to claim 1 has one of the functions as a stator,
The other includes a first member structure and a second member structure serving as a rotor, and in a motor in which the rotor rotates with respect to the stator, the first member structure extends along a peripheral surface facing the second member structure. A plurality of magnetic poles extending in the axial direction, and a plurality of slots formed between adjacent magnetic poles, and a plurality of coils wound in the axial direction between every other slot in the circumferential direction are grouped. A plurality of phases are formed, and the second member structure includes a magnetic body structure, each of which is magnetically independently arranged in a circumferential direction along a peripheral surface facing the first member structure. When the body structure faces a plurality of magnetic poles that are continuous in the circumferential direction, the plurality of magnetic poles are magnetically coupled, and when a current is supplied to each phase, the magnetic flux generated between the plurality of magnetic poles and the magnetic body structure causes the rotor to rotate. Rotation torque is generated In grouped different coil phases, energization polarity of the coils wound around the slots adjacent in the circumferential direction is set to be equal.

According to the first aspect, each magnetic body structure is insulated in the circumferential direction of the first member structure, and is magnetically coupled when a coil is energized facing a plurality of adjacent magnetic poles. The motor can continuously generate torque without interference between the phases. In addition, the adjacent 1
Since the energization polarities of different coils in two phases are equal,
When energizing one phase, magnetic fluxes generated in different coils in the same adjacent phase flow in directions to cancel each other. That is, the influence of the magnetic flux generated by each of the different coils in one phase is very small between the adjacent coils.

Depending on the configuration of the motor, the ends of the coils in different phases intersect on the magnetic poles, and the coils of different phases in which the ends intersect have the same conduction polarity. It may be.

Further, when an even number of coils are grouped to form each phase, the energization polarities of the coils become equal at all places where different coils are adjacent to each other in one phase. It can be configured as follows. Therefore, the influence of the magnetic flux generated by each of the different coils in one phase is very small between all these adjacent coils, which is preferable.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the SR according to the present embodiment.
FIG. 2 is a radial cross-sectional view showing a rotor, a stator, and a coil, which are basic components of a (Switched Reluctance) motor.

In the embodiment shown in FIG. 1, the rotor 20 is of an outer rotor type in which the outer periphery of the stator 10 is rotated. However, an inner rotor type motor in which the rotor rotates inside the stator may be used. The present invention can be applied.
One of the stator 10 and the rotor 20 constitutes a first member structure, and the other constitutes a second member structure.

The stator 10 is formed of a columnar magnetic body having a predetermined outer diameter, and has twelve magnetic poles S1 to S12 protruding radially outward along the outer periphery thereof.
12 slots SR1 formed between adjacent magnetic poles
To SR12 are alternately formed at equal intervals in the circumferential direction. Each of the magnetic poles S <b> 1 to S <b> 12 extends in the axial direction of the stator 10, gradually narrows from the center of the stator 10 to the outside in the radial direction, and has a widened shape at the tip end. Note that the slots SR1 to SR12 are
May be axially twisted within.

Coil Aa, Ab, Ba, Bb, Ca, C
b is wound around the magnetic pole in the slots SR1 to SR12 with two magnetic poles and two slots being skipped as shown in FIG. The SR motor according to the present embodiment is controlled by three phases. Each phase is grouped by coils Aa and Ab, coils Ba and Bb, and coils Ca and Cb. In each phase, the coils are connected in series or in parallel. Connected. In FIG. 1, x and. In each coil indicate the polarity of the windings of the coils Aa to Cb, that is, the polarity when a current flows. × indicates a current flowing from the near side toward the paper surface, and · indicates a current flowing from the near side to the paper surface.
Note that FIG. 1 does not show that a current always flows through all coils during operation of the motor.

The rotor 20 is formed in a cylindrical shape having an inner diameter larger than the outer diameter of the stator 10 by a predetermined gap, and rotates coaxially along the outer circumference of the stator 10. The rotor 20 is shown as a rotating body 21 having a ring-shaped cross section. Eight magnetic pieces J1 to J8 are fixed at equal intervals on the inner peripheral surface of the rotating body 21. The rotating body 21 is formed of a non-magnetic material or a magnetic material that is much weaker than the stator 10, and includes magnetic material pieces J 1 to J 8.
A circumferential magnetic interception is performed. Therefore, the magnetic material pieces J1 to J8 are magnetically independent in the circumferential direction, and substantially no magnetic path is formed between the magnetic material pieces adjacent in the circumferential direction, or the magnetic path is formed. It has become difficult.

Each of the magnetic pieces J1 to J8 has its inner peripheral surface slightly projecting radially inward from the inner peripheral surface of the rotating body 21, and faces the magnetic poles S1 to S12 of the stator 10 via an appropriate gap. Then, the stator 10 and the rotor 20 are magnetically coupled with mechanical stability and low magnetic resistance in a magnetic circuit. In the present embodiment, the width on the inner peripheral surface side of each of the magnetic body pieces J1 to J8 is formed larger than the width of each of the magnetic poles S1 to S12.

FIGS. 2 to 4 are diagrams for explaining the operation of each step of the SR motor shown in FIG. First, when a current flows through the first-phase coils Aa and Ab as shown in FIG. 2 due to the positional relationship between the stator 10 and the rotor 20, the coils Aa and Ab are wound in two-slot intervals. Slots SR1 and SR4 in which the coils Aa are housed at every 90 ° angle as viewed from the center of
Magnetic flux is generated around the slots SR7 and SR10 in which the coil Ab is housed. This magnetic flux is generated by the adjacent magnetic poles S1 and S1.
2 (S4 and S5, S7 and S8, S10 and S11) and the magnetic piece J2 (J4, J6, J8)
It flows through a closed loop magnetic path surrounding R1 (SR4, SR7, SR10). And the combination of magnetic poles S1 and S2,
The direction in which the magnetic flux flowing between S4 and S5, S7 and S8, S10 and S11 and the magnetic pieces J2, J4, J6 and J8 increases, that is, the magnetic flux coupled to the coil has a maximum value (the coil inductance has a maximum value). A rotational torque is generated in the following direction. 2 to 4, the direction of the torque is indicated by an arrow.
If this is shown in FIG. 10 described above, the inductance of the coil indicates a direction that changes from Lu to LA.

FIG. 3 shows a state advanced from FIG. 2 in a state in which the energization to the first phase composed of the coils Aa and Ab is switched to the energization to the second phase composed of the coils Ba and Bb. is there. In FIG. 3, the current starts flowing through the coils Ba and Bb. At this time, the inductance of the coils Ba and Bb is such that the magnetic resistance of the magnetic material piece of the rotor 20 has a minimum value with respect to the coils Ba and Bb. That is, the second phase is located at the position of the unaligned θu in FIG. 10 and takes the inductance Lu.

FIG. 4 shows a further step, wherein the combinations of the magnetic poles of the stator 10 are S1 and S2, S4 and S5, S7 and S8, S10.
And the magnetic flux in S11 and the magnetic pieces J2, J4, J6, J8 take the maximum value, and the first phase coils Aa, Ab
Is at the align position θA in FIG. 10, and the inductance takes the maximum value LA. In this state, the inductance of the coils Ba and Bb of the second phase is in the process of increasing, and the torque shown in the arrow direction of FIG. 4 is generated following the first phase. At this time, the torque generated by the first phase is zero. After the first-phase coils Aa and Ab have passed the alignment position θA, the current supplied to the first-phase coils Aa and Ab is cut off to prevent the generation of torque in the direction opposite to the rotation direction of the rotor 20. . Similarly, as the steps progress from the second phase to the third phase (the coils Ca and Cb) and the first phase, the rotation torque is continuously generated.

As is clear from the above description of the operation, the magnetic flux generated around the coil wound around each slot is formed between the magnetic pole piece facing the magnetic pole piece which is magnetically insulated circumferentially from the other. Since the magnetic flux generated by energizing the coil wound on the adjacent slot corresponding to the next phase flows magnetically so as to form a closed circuit between them, since the magnetic flux is magnetically insulated from the previous phase, Torque can be continuously and efficiently generated without receiving interference between the phases.

That is, in the first embodiment,
Since a magnetic flux can flow between one magnetic piece of the stator 10 and magnetic poles on both sides of one slot of the rotor 20 facing the same, the magnetic flux can flow at more places on the circumference of the rotor 20 than the conventional SR motor. Since the magnetic pole and the magnetic piece can be used, the magnetic pole S1 of the stator 10 can be used.
2 to 5, the stator 10 and the rotor 20 in the aligned state can be understood from FIGS.
It can be understood that the overlap area of the above and the cross-sectional area for determining the maximum interlinkage magnetic flux can be about twice that of the conventional SR motor. Furthermore, since the magnetic material pieces J1 to J8 of the rotor 20 are magnetically insulated in the circumferential direction, magnetic leakage to other magnetic material pieces during unalignment is suppressed, and the inductance during unalignment is reduced. It also has.

This makes it possible to increase the magnetization energy W shown in FIG. In other words, a large torque can be secured without increasing the number of turns of the coil, and at the same time, the inductance at the time of unalignment can be suppressed to a low value. Can be secured.

Further, as shown in FIGS. 3 and 4, the timing at which the first phase and the second phase are simultaneously energized, for example, the first phase coils Aa and Ab and the second phase coils Ba and Bb are simultaneously energized. At this time, the polarity of the current flowing through each coil is set so that the influence of the leakage magnetic flux between the first phase and the second phase (electromotive force due to the current flowing in the other phase) is in a direction to cancel each other. That is, the influence of the leakage magnetic flux occurs between adjacent slots. First, focusing on the first phase coil Aa, the influence of the leakage magnetic flux from the second phase to the slot SR1 is affected by the slot SR2 of the coil Ba. The influence of the leakage flux from the second phase to the slot SR4 of the same coil Aa is due to the slot SR5 of the coil Bb. This leakage flux is the coil Aa
, The directions are opposite to each other, so that the electromotive force due to the leakage magnetic flux is canceled. Similarly, focusing on another coil Ab of the first phase, the leakage magnetic fluxes from the slots SR8 and SR11 are in opposite directions in the coil Ab, and the electromotive force is canceled out similarly. Further, even if attention is paid to the second phase coils Ba and Bb, the influence of the leakage magnetic flux from the first phase is negated. That is, since the coils Aa and Ab are grouped as the first phase and the coils Ba and Bb are grouped as the second phase and connected in parallel or in series with each other, the first phase to the second phase or the second phase to the second phase The effect of the leakage magnetic flux on one phase will be cancelled. Thereby, during the so-called overlap period in which the first phase and the second phase are energized simultaneously, the back electromotive force between the phases is suppressed to a small value, and the rising and falling speeds of the current in each phase are reduced in each phase. Is controlled only by the self-inductance of the current, so that the speed of the rise and fall of the current is not delayed by the influence of other phases, and the optimal current can be flown at a desired timing, so that the rise of the current can be performed. A reduction in the generated torque due to a delay in the speed or a generation of a reverse torque in a delay in the fall speed of the current can minimize the reduction in the total torque of the motor. This effect is the same as described above in the relationship between the third phase grouped by the coils Ca and Cb, the first phase, or the third phase and the second phase.

FIG. 5 shows a second embodiment of the present invention, in which the number of magnetic poles of the stator is 24 and the number of magnetic pieces of the rotor is 16 and is different from that of the embodiment of FIG. There is an advantage that the length of the coil can be made shorter than that of the motor and the rotation of the SR motor can be controlled more accurately.

This is because four coils (Aa-Ad, Ba-Bd, Ca) are located at positions where one phase is divided into four equal parts in the circumferential direction.
To Cd) to form a first phase, a second phase, and a third phase, respectively. Although the magnetic poles, slots and magnetic pieces are not described, the magnetic piece (the member indicated by hatching in FIG. 5) is different in shape from the magnetic pieces J1 to J8 in FIG. Since this is only the case, the description is omitted.

In the embodiment shown in FIGS. 1 and 5, the first
The phase, second and third phases were SR motors configured to be formed by grouping an even number of coils,
Each phase is not necessarily formed by grouping an even number of coils depending on dimensions, torque, output, efficiency, and the like. Such an embodiment is described below. FIG. 6 shows a third embodiment of the present invention, in which the number of magnetic poles of the stator is 18 and the number of magnetic pieces of the rotor is 12, which is different from the motor of the embodiment of FIG. Therefore, there is an advantage that the length of the coil can be shortened.

In the SR motor according to the second embodiment, three coils (Aa, Ab, and Ac, Ba, Bb, and Bc, Ca, Cb, and Cc) at positions that divide the circumferential direction into three equal parts are grouped. To form a first phase, a second phase and a third phase. Therefore, each different coil of each phase (first
In the case of the phase, in the coils Aa, Ab, Ac), two sets of the coils wound in the slots adjacent to each other in the circumferential direction of the stator 10 have the same polarity in the axial direction, but one set has the same polarity in the axial direction. It will be reversed. That is, in the first phase of FIG. 5, the polarity of two adjacent slots among the slots around which the coil Aa and the coil Ab are wound is... And the adjacent slot among the slots around which the coil Ab and the coil Ac are wound. The two slots have the same polarity in the axial direction as x, but the adjacent two of the slots around which the coil Ac and the coil Aa are wound have different polarities. First
The magnetic flux generated by the energization of the phase increases, and the influence of the leakage magnetic flux increases. However, in the second embodiment, the influence of the magnetic flux occurs only at one of three adjacent positions of three coils in one phase,
Since the influence of the magnetic flux does not occur at two places, the generated torque is slightly reduced as compared with the sr motor of the first embodiment, but the effect of the leakage magnetic flux is reduced and the motor can be used practically.

In the embodiment shown in FIGS. 1, 5 and 6, the stator 10 is provided with magnetic poles and slots, and the coil is wound, and the rotor is fitted with a magnetic material piece. The magnetic piece may be attached to the rotor, the rotor may be provided with magnetic poles and slots, the coil may be wound, and the current may be supplied to the coil of the rotor via a brush.

The embodiment shown in FIGS. 1, 5 and 6 describes the case where the coil is wound around the magnetic pole protruding in the radial direction, so that the coil is wound around the adjacent slot in the circumferential direction. However, the winding direction of the coil varies depending on the configuration of the magnetic poles, and depending on the structure of the motor, the coil may be wound around adjacent slots in the circumferential direction. It is conceivable that the energization polarities of the turned coils become equal in the radial direction.

Although the present invention has been described with reference to the embodiment, the present invention is not limited to the above-described embodiment. For example, the number of magnetic poles and slots, the number of magnetic material pieces, , Output, efficiency, torque fluctuation, etc., and may be changed as long as it is in a form in accordance with the gist of the present invention.

[0042]

According to the present invention, each magnetic body structure is insulated in the circumferential direction of the first member structure, and is magnetically coupled when a coil is energized facing a plurality of adjacent magnetic poles. In addition, the motor can continuously generate torque without receiving interference between the phases. In addition, the adjacent 1
Since the energization polarities of different coils in two phases are equal,
When energizing one phase, magnetic fluxes generated in different coils in the same adjacent phase flow in directions to cancel each other. That is, the influence of the magnetic flux generated by each of the different coils in one phase is very small between the adjacent coils. Thus, at the time of two-phase energization during energization switching to different phases, the current flowing in one phase always flows stably irrespective of the influence of the current flowing in the other phase. Therefore, the energization of one phase rises and the other phase de-energizes quickly, so that the torque can be quickly generated by starting the energization of one phase, and the energization of the other phase can be maintained. This is preferable because generation of reverse torque can be suppressed.

[Brief description of the drawings]

FIG. 1 is a radial cross-sectional view showing a rotor, a stator, and a coil, which are basic components of an SR motor according to a first embodiment of the present invention.

FIG. 2 is a diagram for explaining an operation of a first step of the SR motor in FIG. 1;

FIG. 3 is a diagram for explaining an operation of a second step of the SR motor in FIG. 1;

FIG. 4 is a diagram for explaining an operation of a third step of the SR motor in FIG. 1;

FIG. 5 is a diagram illustrating an SR motor according to a second embodiment of the present invention.

FIG. 6 is a radial sectional view showing an SR motor according to a third embodiment of the present invention.

FIG. 7 is a diagram showing a stator and a rotor of a conventional SR motor.

8 is a diagram showing a basic structure of the SR motor of FIG. 7 and an operation principle including coils.

FIG. 9 is a diagram showing the inductance, current, and generated torque of a coil for one phase.

FIG. 10 is a diagram showing a magnetization curve of an SR motor.

FIG. 11 is a diagram showing a stator magnetic pole angle and a rotor angle.

FIG. 12 is a diagram showing a relationship between a stator magnetic pole angle and a rotor angle.

[Explanation of symbols]

10 ... stator 20 ... rotor 21 ... rotating body Aa, Ab, Ac, Ad, Ba, Bb, Bc, Bd, C
a, Cb, Cc, Cd: coil J1 to J8: magnetic piece S1 to S12: magnetic pole SR1 to SR12: slot

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H002 AA09 AB07 AC04 AE08 5H603 AA01 BB01 BB07 BB09 BB12 CA01 CA05 CB05 CC05 CC11 CC17 CD05 5H619 AA01 BB01 BB06 BB13 BB15 BB24 PP02 PP05 PP06 PP08 JP14 JK05

Claims (3)

[Claims] 1. A motor comprising a first member structure and a second member structure, one of which serves as a stator and the other serves as a rotor, wherein the rotor rotates with respect to the stator. Has a plurality of magnetic poles extending in the axial direction along the peripheral surface facing the second member structure, and a plurality of slots formed between the adjacent magnetic poles, and a plurality of magnetic poles are provided in the circumferential direction. A plurality of phases are formed by grouping a plurality of coils wound in the axial direction between the slots, and the second member structure is respectively formed along a peripheral surface facing the first member structure. Comprises a plurality of magnetic material structures that are arranged magnetically independently in the circumferential direction. When the magnetic material structure faces the plurality of magnetic poles that are continuous in the circumferential direction, the plurality of magnetic poles are magnetically coupled. , Energize each phase In this case, a rotating torque is generated in the rotor by magnetic flux of a magnetic closed circuit generated between the plurality of magnetic poles and the magnetic body structure, and different coils grouped into one phase are wound around slots adjacent in the circumferential direction. A motor characterized in that the energized polarities of the turned coils are equal. 2. The motor according to claim 1, wherein ends of coils in different phases intersect on the magnetic pole, and coils of different phases in which the ends intersect have the same conduction polarity. . 3. The motor according to claim 1, wherein each phase is formed by grouping an even number of coils.