KR960001954B1 - Switched reluctance motor - Google Patents

Abstract

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Description

Switched reluctance motor

1 is a schematic diagram of a stator and a rotor of a typical three-phase switched reluctance motor.

2 is a schematic diagram of a stator and a rotor of a typical three-phase switched reluctance motor.

3 is a layout view of a sensor disk and a sensor installed in a conventional three-phase switched reluctance motor.

4 is a timing diagram of a sensor detection signal and an excitation signal in a conventional three-phase switched reluctance motor.

5 is a layout view of a sensor disk and a sensor installed in a conventional four-phase switched reluctance motor.

6 is a timing diagram of a sensor detection signal and an excitation signal in a conventional four-phase switched reluctance motor.

7 is a schematic diagram of a stator and a rotor of a four-phase switched reluctance motor according to the present invention.

8 is a configuration diagram of a sensor disk and a sensor arrangement of a four-phase switched reluctance motor according to the present invention.

9 is a partial cross-sectional view showing the installation state of the sensor disk and the sensor of the switched reluctance motor according to the present invention.

10 is a logic table showing an example of a sensor detection signal and an excitation signal of a four-phase switched reluctance motor according to the present invention.

11 is an inductance profile waveform diagram for explaining the conduction angle and the advance angle of a four-phase switched reluctance motor according to the present invention.

12 is a table showing an application example of the conduction angle and the advance angle according to the pole-pole ratio of the switched reluctance motor according to the present invention.

13 is a layout view of a sensor disk and a sensor of a three-phase reluctance motor to which the present invention is applied.

14 is a timing diagram of a sensor detection signal and an excitation signal in a three-phase reluctance motor to which the present invention is applied.

* Explanation of symbols for main parts of the drawings

11: stator 12: rotor

13 stator poles 14 stator poles

15: winding 20, 40: sensor disk

21, 23, 41 43: opening 22, 24, 42, 44: closing

30: end Brekit 31: rotation axis

31a: flat part of the rotating shaft 31b: screw part of the rotating shaft

32: spacer 33, 36a: nut

34: sensor kit 35: beam hole

36: screw 37: bearing

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reluctance motor, and in particular, it is possible to obtain low speed and high torque required by a direct drive type washing machine and the like, while reducing the number of poles of the stator and the rotor. The present invention relates to a switched reluctance motor that enables forward / reverse rotation control with only a control unit of.

In general, a switched reluctance motor adopts a relatively simple control method, and thus is easily manufactured and inexpensive. Therefore, a switched reluctance motor is mainly used as a power source such as a direct drive type washing machine or a vacuum cleaner.

Such a general switched reluctance motor includes a stator 1 having a plurality of poles 3 fixed inwardly in a housing of the motor as shown in FIGS. 1 and 2, and a plurality of protrusions 4. The rotor 2 is formed outwardly and is rotatably installed around the rotation shaft 2a inside the protrusions 3 of the stator 1 and wound around the protrusions 3 of the stator 1. A position detection device for detecting the position of the winding 5, the rotor 2, and a control unit for generating power of each phase excitation signal based on the position detection signal of the position detection device to supply power to the windings of each phase. In the three-phase and four-phase motors, the pole ratios of the stator and the rotor have a ratio of 6: 4 and 8: 6, respectively.

Referring to the operation of the general switched reluctance motor is configured as follows.

When the winding 5 wound around the stator 1 is excited, the reluctance (magnetic resistance) between the salient pole 3 of the stator 1 and the salient pole 4 of the rotor 2 is minimized. The rotational force is generated, and the drive of the motor is achieved by sequentially exciting the windings 5 of the stator 1 so that the rotational force is continuously generated.

At this time, in order to sequentially excite the windings of each phase, the position of the rotor 2 is detected by using the position detection device, and then the phase detection signals are logically combined to excite each phase in turn.

By the way, the pole number ratio of the stator 1 and the rotor 2 has a 6: 4 ratio as shown in FIG. 1 in the case of a three-phase motor, and as shown in FIG. 2 in the case of a four-phase motor. 8: 6 ratio, which is the ratio of the number of poles in the basic structure of three-phase motor and four-phase motor, or in the reluctance motor used as a power source for products requiring low speed and high torque, such as washing machines, the actual stator and rotor It has a number of poles of a predetermined multiple of 4 and 8: 6 ratio, and the winding is composed of at least three phases. The reason for this is to increase the number of poles of the stator and rotor to obtain high torque even at low speeds.

For example, according to US Patent No. 4,998,052, the number of poles of the stator and the rotor of the reluctance motor used as the power source of the washing machine is three to four times higher than the ratio of 6: 4 and 8: 6 (for example, five times). It is configured to be.

That is, in order to obtain high torque at a low speed, in the three phases, 18 to 30 protrusions 3 of the stator 1 are configured, and 12 protrusions 4 of the rotor 2 are adjusted in a ratio of 6: 4. In the case of four phases, the number of poles 3 of the stator 1 is 24 to 40, and the number of poles 4 of the rotor 2 is 18 to 30 according to the ratio of 8: 6. Doing.

In addition, the position detection apparatus of the conventional switched reluctance motor, as shown in Figs. 3 and 5, three optical sensors (S _{1 ...} S ₃ ), _{three for the} three phases, (S ₁ ‥ S ₄ is fixed to the motor housing, has the same shape as the rotor (2) and the interupting type sensor disk (6) that rotates with the rotor (2) is a rotating shaft ( It is fixed to 2a) and logically combines the position detection signal of each sensor through a control unit (not shown) to drive each phase in turn. The sensor disk 6 is provided with the same number of wings 7 as the number of the salient poles 4 of the rotor 2, and the sensors S ₁ S ₃ , S ₁ S ₄ Detects the passage of (7), respectively. 3 and 5 illustrate the case where the number of poles of the stator and the rotor is 6: 4 and 8: 6.

For example, in the conventional position detection apparatus of a three-phase reluctance motor, as shown in FIG. 3, vanes 7 are formed in the sensor disk 6 at 90 ° intervals, and the vanes 7 are circumferential 30 degrees. It occupies °, and the cutting part 8 between a wing | blade is comprised so that it may occupy 60 degrees of a circumference. The sensors S _{1 to} S _{3 are} arranged at the same circumference at 120 ° intervals so that the sensors S _{1 to} S ₃ detect the vanes 7 of the sensor disk 6 in sequence.

Accordingly, the detection signals from the sensors S _{1 ˜} S ₃ are represented by S ₁ , S ₂ , and S ₃ as shown in FIG. 4, and the current command and angle command (Angle) are controlled by a control unit (not shown) that is a TTL element. A phase excitation signal (S ₁ · S ₂ ) and b phase excitation signal ( S ₂ and c phase excitation signal (S ₁₎ ) To drive the motor counterclockwise. Codes of the sensor signals of the sensors are denoted by the same symbols for convenience. The excitation signal is used as a base or gate driving signal of a switching element that excites each phase of the reluctance motor driver (not shown) to drive the motor. When the excitation signal is applied in the order a → b → c, The electron 2 rotates in the counterclockwise direction, and rotates in the clockwise direction when the excitation signal is made in the order a → c → b. At this time, it is possible to generate the excitation signal by using only two sensor signals when generating the excitation signal of the three-phase motor, but three sensors are required because the angle of the angle should be considered in reverse according to the direction. That is, when the counterclockwise rotation, each phase excitation signal is generated by the position detection signal by the S ₁ and S ₂ sensors, and when the clockwise rotation is performed, the counteradvanced opposite to the counterclockwise rotation. Since the angle must be taken into consideration, the position detection signal by the S1 and S3 sensors are combined to generate the excited signal.

On the other hand, in the case of a four-phase motor, as shown in FIG. 5, blades 7 are formed on the sensor disk 6 at 60 ° intervals, but the blades 7 occupy 18 ° of the circumference and the cutout 8 ) Occupies 42 ° of the circumference, and the sensors S ₁ ‥ S ₄ are arranged at 45 ° intervals so that the sensors S ₁ ‥ S ₄ detect the vanes 7 of the sensor disk 6 in sequence. It is arranged to.

Accordingly, the detection signal from the sensor S ₁ ‥ S ₄ is shown as S ₁ , S ₂ , S ₃ , S ₄ which is a low potential signal for 18 ° and becomes a high potential signal for 42 ° as shown in FIG. 6. In addition to the signal of the portion generating the current command and the angle command by a control unit (not shown) composed of a TTL element, the a-phase excitation signal ( S ₄ and b phase excitation signal (S ₃₎ ) And c phase excitation signal (S ₂ ) And d phase excitation signal (S ₁ ) To drive the motor counterclockwise. Here, when the excitation signal is applied in the order a → b → c → d, the rotor 2 rotates in the counterclockwise direction, and when the excitation signal is made in the order a → d → c → b, it rotates clockwise. do.

However, even in the case of requiring only simple forward / reverse driving as in a direct drive type washing machine, three sensors in three phases and four sensors in four phases are required, and the signals and rotation directions and According to the speed, the excitation signal must be generated in consideration of the forward / reverse advance angle and the like, so that the control unit becomes very complicated. As a result, it is more complicated than necessary to use as a power source of household products, resulting in a cost increase.

In addition, since the relative positions between the sensors are limited to a certain angle between the plurality of sensors, that is, 120 ° for three phases and 45 ° for four phases, assembly is poor, and in particular, relative positions between the sensors are poor. If it is not exactly, there is a problem that the error of the position detection signal occurs.

For example, since the three-phase motor generates the excitation signal only by the position detection signals by the two sensors, if the positional relationship between the two sensors is not correct, the point of time when the position detection signals by the two sensors should be changed at the same time ( Example: 30 °, 120 ° in Fig. 4) does not change at the same time, and no signal section or signal overlapping section is generated. Therefore, if the motor is stopped in such error section, the motor does not start, There is a problem that an unwanted excitation signal is generated.

In addition, in the conventional reluctance motor, the number of poles of the stator and the rotor is set to be 3 to 5 times of the 8: 6 structure or the 6: 4 structure in order to obtain low speed and high torque. Accordingly, there is a problem in that the structure becomes complicated and the miniaturization of the motor occurs, and the advantage of the reluctance motor, which is relatively easy to manufacture, cannot be fully utilized.

SUMMARY OF THE INVENTION An object of the present invention is to provide a switched reluctance motor capable of controlling forward / reverse rotation by detecting the position of a rotor with only two sensors.

Another object of the present invention is to arrange two sensors on the same line so that the position of the rotor can be detected, thereby improving the assembly of the motor and preventing errors due to the positional relationship of the sensors. To provide a motor.

It is still another object of the present invention to provide a switched reluctance motor that makes it easy to configure the control unit by making the advance angle symmetrical to the left and right of the conductance angle so that the same upper and lower advance angles are given at forward and reverse rotation, respectively. will be.

It is still another object of the present invention that the pole number ratio of the stator and the rotor is composed of twice the 6: 4 structure and the 8: 6 structure, that is, the 12: 8 structure and the 16:12 structure, and the windings are three-phase and four- It is designed to provide a switched reluctance motor that can make low speed and high torque enough to be applied to a washing machine, while also making it easy to manufacture, which is an advantage of reluctance motor, and contributing to miniaturization. will be.

Objects of the present invention as described above, a plurality of protrusions are formed inwardly and the rotor is fixed to the housing of the motor and a plurality of protrusions are formed on the rotating shaft is rotatably installed inside the stator, each pole of the stator The excitation winding wound on the field and connected in at least three phases to generate energy for driving the motor, a position detecting device for detecting the position of the rotor, and a position detecting signal of the position detecting device. And a control unit for generating an excitation signal for exciting each pair of windings in turn and supplying power to the excitation winding for each phase, wherein the ratio of the poles of the stator and the rotor is 6: 4 and 8: 6. The actual number of poles is twice the number of poles, and the position detecting device has two concentric circles at the edge of the disc. A predetermined number of openings and closures occupying a predetermined angle of each circumference are alternately formed and inserted into the rotating shaft so as to rotate like the rotor, and through the openings and closing portions formed in two concentric circles of the sensor disk. It consists of two sensors each detecting, the sensor disk is formed in the opening and the closing portion in the form of two concentric circles, the outer circumference and the circumferential angle occupied by the opening and the closing portion and the inner portion and the closing portion is formed to overlap each other by 1/2 The relative positional relationship between the two sensors, the sensor disk, and the rotor is relatively assembled so as to give an advance angle of 1/2 of the conduction angle to the left and right sides of the conduction angle.

That is, the two sensors are fixedly installed so as to coincide with the center line of any salient pole of the stator, and the sensor disc has a center line of a portion where the outer and inner openings of the sensor disc overlap with each other. It is achieved by constructing a switched reluctance motor according to the present invention in which the advancing angle in forward / reverse rotation is the same as assembled and aligned with the center line.

Hereinafter, a switched reluctance motor according to the present invention will be described in detail according to the embodiment shown in the accompanying drawings.

7 and 8 show an embodiment in which the present invention is applied to a four-phase reluctance motor, and as shown therein, each of the plurality of protrusions 13 and 14 has these protrusions 13 and ( A stator 11 and a rotor 12 having a number ratio of 14 to 8), an excitation winding 15 wound in a four-phase form around each salient pole 13 of the stator 11, and the position of the rotor. And a control unit (not shown) for generating an excitation signal based on the position detection signal of the position detection device and supplying power to each of the phase windings 15.

Here, the number of the salient poles 13 of the stator 11 and the salient poles 14 of the rotor 12 was configured to be 16:12 to satisfy the number ratio of 8: 6. In other words, the number of the salient poles 13 and 14 of the stator 11 and the rotor 12 is twice the number ratio of 8: 6.

In addition, as shown in FIG. 8, the position detecting device includes a sensor disk 20 having two openings and a closing portion formed in two concentric circles and fixed to the rotating shaft of the rotor, and the opening of the sensor disk 20. It consists of two sensors S1 and S2 which respectively detect the passage of.

The sensor disk 20 has a plurality of openings 21 and closing portions 22 formed in the outer peripheral portion of the disk (12, the same number as the number of protrusions of the rotor), and the same number (12) inside the disk. The opening part 23 and the closing part 24 are formed so that 1/2 may be crossed with respect to the outer side opening part 21 and the closing part 22. FIG.

The outer opening 21 and the inner opening 23 are each formed in the form of an arc-shaped long hole perforated in the plane of the sensor disk 20, and the outer closing portion 22 and the inner closing portion ( 24) are formed respectively. Not limited to this, the outer opening may be formed in the form of a cutout, the closing portion may be formed in the shape of a wing, the inner opening may be formed in the form of an arc-shaped hole except the closing portion.

The outer opening 21 and the closing portion 22 are alternately formed so as to occupy 15 degrees each on the circumference, and the inner opening 23 and the closing portion 24 are also formed so as to occupy each 15 degrees on the circumference. The inner opening 23 is arranged so as to overlap with the outer opening 21 and the closing portion 22 by 7.5 °, respectively, and the inner closing portion 24 is half the outer opening 21 and the closing portion 22, respectively. It is arranged to overlap by 7.5 °.

In addition, the two sensors S ₁ and S ₂ detect whether the outer opening 21 and the closing part 22 and the inner opening 23 and the closing part 24 have passed, respectively. Use In the illustrated example, the sensors S ₁ and S _{2 are} provided on one side, but are not necessarily limited thereto, and may be provided on opposite sides (the opposite side of the rotor).

Here, the sensor disk 20, the sensor such that the left and right advance angles of the conduction angle are symmetrical, that is, the advance angle is 1/2 of the conduction angle in order to consider the same advance angle at the forward / reverse rotation. (S ₁ , S ₂ ) and the relative position with the salient pole of the rotor are assembled.

Specifically, the two sensors (S ₁ ), (S ₂ ) is a motor housing is fixed to a predetermined location so as to match the middle line of any protrusion of the stator, the sensor disk 20 is the sensor An imaginary line passing through the middle of the portion where the outer and inner openings of the disk 20 overlap each other is fixed to the rotating shaft so as to coincide with the middle line of any salient pole of the rotor. That is, the middle line separated by 3.75 degrees, taking into account the forward and reverse advance angles at the start edge of the outer opening and at the end of the inner opening, respectively, is assembled to coincide with the middle line of any salient pole of the rotor. On the contrary, the starting edge portion of the outer opening of the sensor disk 20 coincides with the middle line of any salient pole of the rotor, and the two sensors are 3.75 to the right from the middle line of any salient pole of the stator. It can also be fixed so that it is in the wrong position. However, the middle line of the salient pole is an imaginary vertical plane passing through the center of the salient pole and the rotation center point.

On the other hand, as shown in FIG. 9, the sensor disk 20 is fixed to the rear end of the rotating shaft 31 protruding toward the end bracket 30, and the sensors S ₁ and S ₂ are The light emitting element and the light receiving element are built in the sensor bracket 34 in which one side portion is divided into upper and lower portions to face each other, and the beam hole 35 is formed, and the other side is integral, and the other portion of the sensor bracid 34 Is fixed to the end breach kit 30 of the motor housing with a screw 36 and a nut 36a.

At this time, in fixing the sensor disk 20 to the rotating shaft 31, the spacer 32 and the sensor disk 20 are sequentially inserted to the rear end of the rotating shaft 31, the rear end of the rotating shaft 31 The nut 33 is fastened to the formed screw part 31b so that the rotating shaft 31 and the sensor disk 20 are integrally rotated.

In addition, the planar portion 31a is formed on one side of the rotating shaft 31, and a straight portion corresponding to the planar portion 31a is also formed in the shaft hole 20a of the sensor disk 20, or by using a method such as keying. When the rotating shaft 31 and the sensor disk 20 is coupled to be always in the correct position.

Here, the sensor disk of the position detecting device has an example in which the pole ratios of the stator and the rotor are 8: 6 and the pole poles are 16: 12, but the present invention is not limited thereto. : When it is more than 3 times of 6, the circumferential angle occupied by the closure and the opening in accordance with the number of the poles is decreased in accordance with the increase rate of the number of poles, respectively, and the number is increased by multiples.

In FIG. 9, reference numeral 37 denotes a bearing for supporting the rotation shaft 31 to the end bracket 30.

In the four-phase reluctance motor according to the present invention configured as described above, when the rotor 12 starts to be driven, the sensor disk 20 fixed to the rotating shaft 31 together with the rotor 12 rotates. Accordingly, the sensors S ₁ and S ₂ alternately detect whether the outer opening 21 and the closing portion 22 and the inner opening 23 and the closing portion 24 of the sensor disk 20 pass through each other. Done.

When the position detection signals by the sensors S ₁ and S ₂ are rotated in the counterclockwise direction CCW as shown in FIG. 10, the signals [S1, S2] are " [1, 0] > [0,0] → [0,1] → [1,1] "is displayed repeatedly. This signal is logically combined with each phase excitation signal by the controller (not shown). Will be driven in turn. In contrast, when rotated clockwise (CW), the signal [S1, S2] is repeatedly displayed as "[1,0] → [1,1] → [0,1] → [0,0]". This signal is logically combined into the respective excitation signals by the control unit (not shown) to sequentially drive the d → a → b → c phases.

At this time, since there is no point at which the two sensor signals change at the same time, that is, the point where the edge portion overlaps, an error of the excitation signal does not occur, and an accurate excitation signal can be generated.

In addition, as shown in FIG. 11, the section in which the inductance inclination (dL / dθ) is "+" becomes 15 ° in the machine angle and the conduction angle θc in which one phase is excited is 7.5 °, The advance angle θa becomes 3.75 ° so that the control unit can drive in the forward / reverse direction only by the rotor position detection signals by the two sensors S1 and S2.

12 shows the conduction angle and the advance angle according to the rock trajectory of the switched reluctance motor according to the present invention, wherein the advance angle θa is 1/2 of the conduction angle θc. Therefore, the advance angles θa shown on both sides of one conduction angle θc are symmetrical with each other, so that operation errors do not occur and forward / reverse driving is possible. The low speed, high torque required by the direct drive type washing machine will be obtained.

On the other hand, Figure 13 shows a rotor position detection device of a three-phase reluctance motor according to the present invention, as shown therein a plurality of (41 in the figure) the opening 41 and the closing portion 42 in the outer peripheral portion ) Is formed and another plurality of openings 43 and closing portions 44 are formed so as to stagger with respect to the outer opening 41 and closing portion 42. ) And a sensor S ₁ for detecting whether the outer opening 41 and the closing part 42 are passed, and a sensor S ₂ detecting whether the inner opening 43 and the closing part 44 are passing. It is provided.

The outer opening 41 is formed in the form of a cutout, the outer closure 42 is formed in the shape of a wing, the inner opening 43 is formed in the shape of an arc-shaped hole drilled in the plane of the sensor disk 40 and The closure 44 is formed by the unperforated portion. On the other hand, the outer and inner openings 41 and 43 are formed in the shape of an arc-shaped hole drilled in the plane of the sensor disk 40, and the closing portions 42 and 44 are formed by the unperforated portion. You may.

The outer opening portion 41 and the closing portion 42 are alternately formed so as to occupy 45 ° on the circumference, and the inner opening 43 and the closing portion 44 are formed so as to occupy 60 ° and 30 ° on the circumference, respectively. The inner opening 43 is arranged so as to overlap the outer opening 41 and the closing portion 42 by 30 °, respectively, and the inner closing portion 44 is disposed in the outer opening 41 and the closing portion 42, respectively. It is formed so that it overlaps with each other by 15 °.

The outer opening 41 is formed in the form of a cutout, the closing portion 42 is formed in the shape of a wing, the inner opening 43 is formed in the shape of an arc-shaped hole except for the closing portion (44).

In the illustrated example, the sensors S ₁ and S _{2 are} provided at one side, but are not necessarily limited thereto, and may be installed at opposite sides.

That is, the number of the outer opening 41 and the closing portion 42 and the inner opening 43 and the closing portion 44 of the sensor disk 40 is equal to the number of protrusions of the rotor (four in the example). It is the same as the case of the four phases of the above-mentioned embodiment except having set the opening angle of the opening part 41, 43 and the closing part 42, 44, and the angle which occupies for the circumference.

In addition, the middle of the overlapping portion of the outer opening and the inner opening of the sensor disk 40 is assembled to match the centerline of any protrusion of the rotor so as to rotate as the rotor, and the sensors S1 and S2 are The stator is installed in accordance with the centerline of any protrusion of the stator, and its mounting structure is the same as in the embodiment of the four-phase motor described above (see Fig. 9).

Here, in FIG. 13, the pole ratio of the stator and the rotor is 6: 4, and the pole pole number is 6: 4, and the present invention is not limited thereto, and the actual pole pole number is not less than twice the protrusion pole ratio 6: 4. In this case, the circumferential angles occupied by the closure and the opening in accordance with the number of the poles are reduced in accordance with the increase rate of the number of the poles, respectively, and the number is increased more than twice.

In this way, the three-phase reluctance motor configured with the rotor position detecting device starts to operate, and when the rotor rotates, the sensor disk 40 fixed to the rotating shaft is rotated together with the rotor, and thus the sensor S ₁ , ( S ₂ ) alternately detects whether the outer opening 41 and the closing portion 442 of the sensor disk 40 pass through the inner opening 43 and the closing portion 44.

At this time, the detection signal by the sensor (S ₁ ), (S ₂ ) is shown as S ₁ , S ₂ , as shown in Figure 14, and the signal by each control unit (not shown) consisting of a TTL element, etc. Phase excitation signal S ₁ · S ₂ , S ₂ , ( · ), OR (S ₁ · This phase excitation signal is applied to the base or gate driving signal of the switching element that excites each phase to sequentially drive each phase to drive the motor.

At this time, the inductance slope (dL / dθ) of the "+" in the three-phase motor is 45 ° in the machine angle and the angle of induction (θc), the angle at which one phase is excited, is 30 °. The angle (Advance Angle) θa is set to 15 ° so that the forward / backward driving can be performed only by the two sensor detection signals by the control unit of the TTL element.

That is, the advance angle θa becomes 1/2 of the conduction angle θc, so that the same advance angle can be given at the forward / reverse rotation, so that an operation error is not generated and forward / reverse driving is possible. do.

As described above, according to the present invention, it is possible to drive the motor in the forward / reverse direction by detecting the position of the rotor with only two sensors, thereby reducing the manufacturing cost and improving the assemblability.

In addition, by giving an advance angle that is symmetrical from the left and right of the conductance angle, it is possible to automatically give the same advance angle during forward and reverse rotation, so that the controller can be easily configured.

In addition, there is no point where the position detection signals detected by the two sensors change at the same time, that is, the point where the edge portions overlap, which prevents an error in which no signal section of the donor signal is generated or an unnecessary exciter signal is generated even at a short moment. This has the effect of increasing the reliability of the motor.

In addition, it is possible to obtain high torque at a low speed required by a washing machine while fully utilizing the advantage of the reluctance motor that the number of the poles of the stator and the rotor is configured to be 16:12 to make manufacturing relatively easy.

Claims (11)

The pole ratio is any ratio of 6: 4 and 8: 6, and the stator and rotor each having two poles of the pole pole ratio and the actual pole poles respectively have a predetermined angle of circumferential angle in the form of two concentric circles on the disk. A sensor disk having a predetermined number of openings and closures formed alternately and inserted and fixed to the rotating shaft so as to rotate like the rotor, and two sensors respectively detecting the passage of the openings and closures formed in two concentric circles of the sensor disk ( S1), Switched reluctance motor characterized by including (S2). 2. The sensor disk according to claim 1, wherein the sensor disk alternately forms the same number of openings and closures as the number of protrusions of the rotor in the form of two concentric circles on the disk, but the outer opening and the closing portion and the inner opening and the closing are closed. Switched reluctance motor, characterized in that the additional circumferential angle occupies each other by a predetermined angle. The sensor disk according to claim 2, wherein the outer opening and the inner opening are each formed in the shape of an arc-shaped hole formed in the plane of the sensor disk, and the outer and inner closures are formed by the non-perforated portions, respectively. Switched reluctance motor, characterized in that. The switched reluctance motor according to claim 2, wherein the sensor disk has an outer opening formed in a cutout shape, a closed portion is formed in a wing shape, and the inner opening is formed in an arc-shaped long hole shape except for the closed portion. . The relative positional relationship between the two sensors, the sensor disk, and the rotor is fixed to the two lines (S1) and (S2) in accordance with the center line of any protrusion of the stator. The sensor disk is assembled so that an imaginary line passing through the middle of the overlapping portion between the outer opening and the inner opening of the sensor disk coincides with the center line of any salient pole of the rotor so that its conduction is on the left and right sides of the conduction angle. A switched reluctance motor, characterized in that it is configured to give an advance angle equal to half of the angle. 6. The light emitting device and the light receiving device of claim 2, wherein each of the two sensors has a beamhole 35 formed on one side of the two sensors facing each other, and a light emitting device and a light receiving element are built in the sensor bracket 34 having the other side integrated. And the other side of the sensor bracket (34) is fixed to the end bracket (30) of the motor housing by a screw (36) and a nut (36a). According to claim 5, The sensor disk is fixed to the rear end of the rotary shaft 31 protruding toward the end Brekit 30 side, the planar portion (31a) is formed on one side of the rotary shaft 31 and the sensor In the shaft hole 20a of the disk 20, a straight portion corresponding to the planar portion 31a is also formed, or when the sensor disk 20 is coupled to the rotating shaft 31 using a keying method or the like, it is always accurate. Switched reluctance motor, characterized in that configured to be coupled to. The sensor disk according to claim 2, wherein when the number of protrusions of the stator 11 and the rotor 12 is 16:12, the outer opening 21 and the closing portion 22 are circumferentially formed at the outer periphery of the disk. The inner opening 23 and the closing portion 24 are also formed to occupy 15 degrees each on the circumference, and the inner opening 23 has the outer opening 21 and the closing portion ( Switched reluctance motor, characterized in that it is arranged to overlap each other by 7.5 ° each other 22 and the inner closing portion 24 also overlaps each other by 7.5 ° each half at the outer opening 21 and the closing portion 22. . The method of claim 8, wherein the sensor disk is fixed to the rotating shaft so that the middle line of the overlapping portion of the outer opening and the inner opening is located in the middle of the rotor pole so that the advance angle is 3.75 ° in the forward / reverse rotation, respectively Switched reluctance motor, characterized in that. 3. The sensor disk according to claim 2, wherein when the number of protrusion poles of the stator 11 and the rotor 12 is 6: 4, the outer opening 41 and the closing portion 42 are circumferentially formed at the outer periphery of the disk. Alternately formed to occupy 45 ° in the phase, and the inner opening 43 and the closure 44 are formed so as to occupy 60 ° and 30 ° on the circumference, respectively, and the inner opening 43 is closed with the outer opening 41. Switched reluctance, characterized in that arranged in such a way as to overlap each of the portions 42 by 30 ° and the inner closure 44 is formed so as to overlap each of the outer opening 41 and the closure 42 by 15 °. motor. 11. The sensor disk according to claim 10, wherein the sensor disk is fixed to the rotating shaft such that the middle line of the portion where the outer opening and the inner opening overlap with the middle line of the salient pole of the rotor so that the advance angle is 15 DEG in forward / reverse rotation, respectively. Switched reluctance motor, characterized in that installed.