JPH02142385A - Reluctance motor - Google Patents

Abstract

PURPOSE:To prevent generation of mechanical vibration by directing the vector of the remaining force of a magnetic attraction force outward radially. CONSTITUTION:An annular pole 16 and magnetic poles 16a, 16b... constitute an armature and exciting coils 1a, 2a are wound round them. A rotating shaft 5 is rotatably supported by a bearing provided at an outer casing and a rotor 1 is fastened to the bearing. The outer peripheral part of said rotor 1 is provided with salient poles 17a, 17b..., which face magnetic poles 16a, 16b.... The magnetic poles 16a, 16b are excited according to a certain sequence to give a torque to the rotor 1. In this case, when e.g., the magnetic pole 16a is excited stronger than the facing magnetic pole, the rotor is subjected to a force acting in the direction A-1. Likewise, when there is a difference between the exciting currents of facing magnetic poles, the rotor always receives a force directed outward radially to rotate so that no vibration is generated therein.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Use] This motor is used for the same purpose as the Sarze motor and other conventional motors with relatively large output.

[Conventional technology]

Reluctance-type electric motors are still in the research and development stage, so there is no technology for the same purpose.

[Problems to be Solved by the Present Invention] It is well known that a reluctance type electric motor can provide a large output torque. However, the magnetic attraction force in the radial direction, which is unrelated to the torque between the four salient poles and the magnetic poles, is extremely large.

Further, this magnetic attraction force is changed from the maximum value to zero each time the excitation of the magnetic poles is changed sequentially, and the direction of the vector of the force is also changed. Therefore, loud mechanical noise is generated during rotation.

In order to suppress such vibration, the
The conventional technique is to simultaneously excite a set of magnetic poles at the same phase angle to obtain an output torque, cancel out the above-mentioned radial magnetic attraction forces, and suppress the occurrence of vibration.

Even if such means are adopted, there is a drawback that large mechanical vibrations and accompanying vibration noise remain.

The task of the device according to the invention is to eliminate such residual mechanical vibrations.

[Means to solve problems]

First means.

A set of two magnetic poles is to be excited, and the two magnetic poles are disposed at axially symmetrical positions, and these magnetic poles are simultaneously energized with the same waveform.

Second means.

The two/sets of magnetic poles located at axially symmetrical positions are energized and are alternated sequentially in response to the position detection signal, but the excitation current is controlled so that the vector of magnetic attraction force in the radial direction (as described above, one set of two The vector of the difference in the radial magnetic attractive force between the magnetic pole and the opposing salient pole rotates around the rotation axis in accordance with the rotation of the rotor.

Third means.

Before the excitation current of the above-mentioned pair of magnetic poles is cut off, excitation of the next two/set of axially symmetrical magnetic poles to be excited is started, and when the excitation current is cut off, the accumulation The energization control circuit rapidly converts the generated magnetic energy into the magnetic energy of the excitation coil to be energized next.

[Effect]

When the excitation coils of two/sets of magnetic poles located at axially symmetrical positions are wound with the same ampere turns, their radial magnetic attraction forces are in opposite directions, so they cancel each other out and disappear.
There should be no vibration noise. However, the gap between the two opposing salient poles is set to a uniform gap length of about 0.7 to 0.2 mm in order to maintain the output torque. It is difficult to maintain such a small gap accurately during mass production. If there is a difference in the air gap length, a magnetic attractive force remains, and the four torques of this force rotate with the rotation of the rotor, and the direction of the vector changes in the opposite direction. Therefore, it induces vibrations in the rotor and becomes the first cause of mechanical vibrations.

Also, due to the gap between the Zeal of the Zeal bearing that supports the rotating shaft and its rolling groove, the rotor is induced to vibrate due to the residual force vector of the radial magnetic attraction force described above. Vibration induction is accelerated by abrasion of the seel during use.

This is the second cause of vibration induction.

According to the device of the present invention, the energizing current of the exciting coil is controlled so that the vector of the residual force of the radially reciprocal magnetic attraction force is directed in a predetermined direction, that is, in the direction outward in the radial direction. . Of course, the number of turns of the excitation coil is all constant.

Therefore, the rotating shaft rotates while pressing against the seal of the seal bearing, which generates mechanical vibrations. Second
It has the effect of eliminating the cause of

Therefore, generation of mechanical vibration and noise is suppressed.

According to the configuration of the device of the present invention, the following effects are further added.

In a reluctance type electric motor, the magnetic energy stored in the excitation coil is very large, so the rise of the excitation current is delayed due to the accumulation, and after the energization is stopped, the stored magnetic energy is released and becomes the excitation current. Therefore, this becomes a counter torque.

For the reasons mentioned above, there is a problem that the motor has a high torque but a low speed, which limits its range of use, and that it cannot be used in place of the well-known DC motor.

According to the device of the present invention, the above-mentioned problems can be solved. Furthermore, since six circuits are used to control the excitation current, the output torque can be changed in accordance with the reference voltage.

〔Example〕

Next, details of an embodiment according to the present invention will be explained with reference to FIG. 1 and subsequent figures. Items with the same symbol in each drawing are the same parts, so
Duplicate explanations will be omitted.

As examples of λ-phase and 3-phase reluctance type motors in which the present invention is implemented, a 2-phase motor is shown in FIG. 1, and a 3-phase motor is shown in FIGS. 1(a) and 1(b). . The co-phase roughtance type electric motor will be explained next.

All angles shown below are in electrical angles.

In FIG. 1, an annular portion /6 and magnetic poles /6a and /6b.

... is made by a well-known method of laminating and solidifying silicon steel plates, and is fixed to an outer casing (not shown) to form an armature. The part with symbol /6 is the magnetic core which becomes the magnetic path.

Magnetic poles /6a, /6b have excitation coils /a, 2? s
is wrapped. Other excitation coils are omitted and not shown.

The bearing installed on the outer casing has a rotating shaft! is rotatably supported, and a rotor l is fixed to it.

On the outer periphery of the rotor, there are salient poles /7a, /71),
... are provided, with magnetic poles /6a, /+Gb, - and o,ir millimeters facing each other with an air gap in between.

The rotor/is also made by the same means as the armature/6.

A developed view of FIG. 1 is shown in FIG. 3(C).

In FIG. 3(C), there are 10 salient poles, with equal widths and equal separation angles. Magnetic pole /Aa, /6111
The width of . . . is equal to that of the salient poles, and g pieces are arranged at equal pitches.

When the excitation coils Ja, 2a, 1b, /b are energized,
Salient poles /7b, /7g, /7c, /7h are attracted and rotate in the direction of arrow A.

When rotated by 90 degrees, the excitation coils ja and 2h are de-energized and the excitation coils 2b and jb are energized, so that torque is generated by the salient poles /7d and /71.

The arrow /a indicates the excitation polarity rotated by 90 degrees from the illustrated state, and the magnetic poles /6b and /6c are the north pole and the magnetic pole /lf.

76g becomes the south pole. The purpose of such polar magnetization is to reduce counter torque due to leakage of magnetic flux.

During the next 90 degree rotation, ie, between the arrows/b, each magnetic pole assumes the N and S polarities shown. The display of 0 indicates non-excitation.

The next 90 degree rotation and the next qo degree rotation are indicated by the arrow/zac
, /zad.

Due to the above-mentioned excitation, the rotor / rotates in the direction of arrow A and becomes a co-phase electric motor.

There are two sets of magnetic poles in the first phase, respectively: magnetic pole /Aa,
/Aa and magnetic poles /6C, /AC. The first phase excitation coil wound on each is an excitation coil ■
, ■ and excitation coils 1b, /b.

There are two sets of magnetic poles in the second phase, respectively: magnetic pole /6b,
/At) and magnetic poles /6a and /Aa. The excitation coils of the second phase wound thereon are excitation coils ja, 2a and excitation coils 2t) and 2b, respectively.

The width between each magnetic pole is /,j times that of the salient pole.

Furthermore, since the space in which the excitation coil is installed is large, thick windings can be used, which has the effect of reducing copper loss and increasing efficiency.

Since a reluctance type electric motor does not have a field magnet, it is necessary to increase the magnetic flux generated by the magnetic poles to account for the magnetic flux.Therefore, the large space between the magnetic poles has an important meaning.

The number of salient poles in FIG. 3(C) is io, which is larger than the conventionally known structure of this type. Therefore, counter-torque is generated by discharging the magnetic energy accumulated in each magnetic pole due to excitation, and although the output torque becomes large, the rotational speed decreases and problems remain, making it impossible to put it into practical use.

However, according to the means of the present invention, the above-mentioned disadvantages are eliminated and only the effect of increasing the output torque is added.

Next, referring to Fig. ≠(a), a means for obtaining a position detection signal will be explained.

Coils ♂a and ♂b are, as shown in FIG. 3(C),
When the salient pole /7a + /71) +... is opposed to the side surface of the salient pole through a gap, the impedance of the coil increases due to iron loss (including eddy current loss, which is large). becomes smaller.

Coils fa and ♂b have a (/♂O and ♂O) function.

Coils ♂a and ♂b are air-core with a diameter of 549 meters and a 10° angle of 7th position.

Figure ≠(a) shows a device for obtaining position detection signals from coils ♂a and ♂b. On the road to No. 1 (a),
Its output frequency is about /~j megacycles.

Coils lra and rb are air-core coils fixed to the fixed armature side, and have salient poles /7a, /7b, etc. in Fig. 1(a).
When facing ・, its impedance decreases due to eddy current loss, and the voltage drop across resistor /3a increases.

When the coil ra faces the salient pole, an electrical signal smoothed by a low-nos filter consisting of a diode Yua and a capacitor /2a is input to the + terminal of the operational amplifier /Ja.

The voltage drop across the resistor isb is also converted into a direct current by a Ronos filter made up of a diode r/yb and a capacitor 12b, and an electrical signal is input to one terminal of the operational amplifier/Ja.

Since the bridge circuit is adjusted to be balanced when the coil fa does not face the salient pole, there is no output from the operational amplifier /Ja at this time.

When the coil Ja faces the salient pole, the operational amplifier /? The output of a is a rectangular wave with a width of 110 degrees, and this signal is shown by the curve 57aj7b in the time chart of Fig. r (b).
,...

Differential pulses at the starting points of curves j7a, 31b, . . . are obtained from the differentiation circuit≠d, and curves A7 a, k, .
...is shown closed.

The outputs through the inverting circuit are curves j9a, j9b,...
Then, the differential ξrus via the differential circuit μe becomes the curve t
It is shown as rqa, .

Similarly, when the coil yb faces the salient pole, the resistance 15
Since the voltage drop of d is smoothed into direct current and is input to the child terminal of the operational amplifier 73b, the high level output of the operational amplifier 13b is the same as the songs i#a, jlb, and
...and the output via the inversion circuit is the curve AOa
, AOb , ... roar. Differential circuit≠f.

The differential pulses passing through Hiroshig are 6za,...'' and 70
a.

...becomes...

Flip-flop circuit revision a (hereinafter referred to as 2 circuits).

) is in the section between the differential pulses A7a and 65a, so the output is curve 6■ in Fig. g (b).

Otsu 1b,... becomes.

The output of the Q terminal of the F circuit tsb is in the section between the differential pulses 6ga and 69a in FIG. 2(b), so the output is the curve 62a.
, A2b, ... roar.

F circuit AJc, A,! ;The output of the Q terminal of d is a differential pulse &? The interval between a and 70a and the differential pulses 70a and 6
7 Table 56, so the curves A3e, , 63 respectively.
b, . . . and curved portions a, 641b, .

The outputs of terminals At, a, 66b, AAc, 66d are F circuits Aja, Ajb, 6!, respectively. ;c
, 6! ; becomes the output of d.

The same output signal as terminal A6a, 66b,...7
71 circuit, but according to this method, the curve 6■, the 62a1 curve AJa, and the 63a1 curve 6ja
There is a time gap between 61Ia and 61Ia, which makes startup uncertain.

Reluctance type electric motors have the following drawbacks.

As shown by the dotted line curve in the time chart of FIG. 2(a), the torque is extremely large at the beginning when the salient pole begins to oppose the magnetic pole, and becomes small at the end. Therefore, there is a drawback that the resultant torque is also large and includes pull torque.

The following means are effective in eliminating such drawbacks.

FIG. 5 illustrates a state in which a magnetic attraction force is generated between the salient pole /7a and the magnetic pole /Aa.

The width of salient pole/7a (width in the vertical direction of the drawing) is that of magnetic pole/6a
is larger than the width of Since the other salient poles and magnetic poles have the same configuration, regarding salient pole /7a and magnetic pole /la,
The output torque will be explained.

The torque that drives the salient pole/7a in the direction of arrow A is the magnetic flux shown by arrow J and dotted line arrow. This size is salient pole/7
When the opposing area between a and magnetic pole/6a is small, that is, it is large at the beginning, and becomes small at the final stage. Therefore, the output torque becomes asymmetrical. For example, the number becomes like the song Has in Figure (a).

However, the lines of magnetic force indicated by L in the arrow are few at the beginning (and many at the end), so the torque increases more at the end than at the beginning when the two face each other.

Therefore, the output torque curve becomes almost symmetrical, as shown in Figure 2 (
The curve is a dotted line 412a in a).

Since the same means is adopted between the other salient poles and the magnetic poles, the output torque is also symmetrical. This also has the effect of reducing the resultant torque and pull.

Furthermore, there are the following drawbacks.

When the excitation coil is energized to an iro degree, the excitation current curve becomes as shown in the curve ≠6 in FIG. 2(a).

At the initial stage of energization, the current value is small due to the inductance of the IT machine coil, and becomes even smaller at the center due to the back electromotive force. In the final stage, the back electromotive force is small, so it rises rapidly and becomes like a curved line. This final peak value is equal to the current value at startup. In this section, since there is no output torque, there is only a joule loss, which has the disadvantage of greatly reducing efficiency. Since the curve q6 has a width of /♂O degree, the magnetic energy is discharged as shown by the dotted line 6a, and this becomes a counter-torque, further deteriorating the efficiency.

Furthermore, there are the following drawbacks. Increasing the output torque, that is, increasing the salient poles and the number of magnetic impulses, and increasing the excitation current,
The disadvantage is that the rotation speed is significantly reduced.

Generally, in a reluctance type electric motor, in order to increase the output torque, the number of magnetic poles and salient poles as shown in Fig. 3(c) is increased,
It is also necessary to reduce the opposing gap between the two. At this time, if the rotation speed is maintained at the required value, the rising slope of the excitation current becomes relatively gentle due to the magnetic energy accumulated in the magnetic poles /6a, /A'b, etc. in Fig. 3(c). Even if the current is cut off, the time for the discharge current due to magnetic energy to disappear is relatively extended, and therefore a large counter torque is generated.

Due to these circumstances, the peak value of the excitation current value becomes small and counter torque is also generated, so the rotational speed becomes a small value.

Furthermore, there are the following drawbacks.

The magnetic poles /Aa and nl in FIG. 3(C) are arranged at axially symmetrical positions. The radial magnetic attraction force by the magnetic pole/Aa and the salient pole/7a (a magnetic attraction force unrelated to the output torque) is in the opposite direction to the radial magnetic attraction force by the magnetic pole n1 and the salient pole/7f. Therefore, the structure is such that it can be canceled out.

However, the air gap between the magnetic pole and the salient pole is 0. /! Since the lengths are on the order of millimeters, it is difficult to make both gap lengths equal with high accuracy.

Furthermore, if the Dahl bearing wears out during use, a difference will occur in the gap length between the two sides.

Therefore, the magnetic poles /&a and - create a difference in the force with which the rotor l is attracted in the radial direction.

The above-mentioned circumstances are exactly the same for the other magnetic poles /6'b, magnetic poles /6c, and magnetic poles /6d and /A(l).

Since the magnetic attraction force in the radial direction is significantly larger than the magnetic attraction force in the circumferential direction, which is the output torque, the residual magnetic attraction force between the magnetic poles and salient poles located at axially symmetrical positions also becomes large, and the rotor l The disadvantage is that random forces act on the rotor during rotation, generating mechanical vibration and noise.

The gist of the invention is to obtain new technical means that eliminate the above-mentioned drawbacks.

Next, the details of the means will be explained with reference to FIG. 6(b).

In FIG. 6(b), the excitation coil ■ of FIG. 3(C).

, 2a, . . . are indicated by the same symbol, and are excitation coils ■.

Transistors are installed at both ends of ja, jb, and 2b, respectively:
1I) a, 20b and 20c, 20d and 20e, LO
g and 20h are inserted in f and.

The transistors described above may be other well-known semiconductor switching elements.

Terminal! ;■,,! ; /h is input with the position detection signals of curves A2, Alb, . . . in FIG.

The block circuit indicated by the symbol G is the same energization control circuit as the excitation coil μ described above, and the excitation coil t.

This is for controlling the energization of Ja, jb, and jb.

Terminal! ;1b, 31b and terminals 3/c, 3;/c and terminals S/d, j/d have songs @A2a, Alb, - and curve 6J, respectively, which serve as position detection signals in Figure (b).
a, A3b.

... and curves 4Qa, A'Ab, ... are input.

The case where a high level position detection signal is input to the terminals j■ and t■ will be explained.

The time chart in FIG. 7(b) shows the terminals j■, j■
.

3; Position detection signal 6 input to jb, 31b, ...
■.

6Ja, A3a, and 44a are only shown, and when the electric signal of curve A■ is input to the terminals j■ and j■, it is transmitted to the transistor 20a via the amplifier circuit Hiroqa. , 20
Since b is conductive, excitation coil (2) is energized.

The excitation coil (2) is also energized by the output via the AND circuit 90. The electrical signals inputted from the terminal 7a are the position detection signal curves A, 4/b, -, curve 6 a, 621) 1'''+ curves Aja, AJb in FIG. 2(b).

... 9 curve evaluations a, A Hirosu, ... The starting end of each curve is entered.

Therefore, the outputs of ring counters 7 to g of the ring counter 3 are cyclically changed in sequence for each input signal of the transistors 21/-a, 2 . tb is alternately conductive.

The conduction of the transistor 21Aa is alternated every time the rotor of the motor rotates by 0 electrical degrees. Since this angle is an electrical angle, it is alternated every twice the rotation of the salient pole.

A case will be described in which a voltage is applied from the DC power supply when the rotor is located 110 degrees to the left of the position shown in FIG. 3(c).

At the start of rotation, when the output of the ring counter≠3 is obtained from the leftmost terminal (count value/), the transistor 2-a becomes conductive.

During the subsequent 360 degree rotation, the transistor 2 hiro a
remains conductive.

The resistance values of the resistors 2Ja and J, 2t) are equal, and those of the resistors Ua and 2Jb are also equal.

Since the electric signal of curve 6■ in FIG. 7(b) is input to terminals j'■ and j■, energization of excitation coils ■ and 2 is started.

To explain only the excitation coil ■, the excitation current rises as shown by the dotted line jga in Fig. 7(b), and when it rises to the set value, the voltage drop across the resistor 12a becomes Since the input voltage (reference voltage level) is exceeded, the output of the operational amplifier a is converted to a low rail, and the output of the AND circuit μ9a becomes a low level.

Therefore, transistors 20a and 20b become non-conductive,
The excitation current drops. At this time, the magnetic energy of the excitation coil (2) charges the capacitor lA/ via the diode 2 (2) and the 2/1:I resistor 22a, so that the magnetic energy drops rapidly. Due to the hysteresis characteristic of the operational amplifier 4, when the voltage drops by a predetermined value, the output of the operational amplifier 4 becomes high level, the transistors Ja, X)b become conductive again, and the excitation current increases.

Since the chopper circuit repeats such a cycle, the excitation current is maintained at a set value regulated by the reference voltage. The circuit indicated by the symbol 1Aoa is an absolute value circuit (
This is for making the input of one terminal of the operational amplifier 4'a a positive voltage regardless of whether the resistor 22a, :lJa is energized in the forward or reverse direction.

Similarly, energization to the excitation coil is controlled by the electric signal of curve 4■ input to terminal A■.

In this case, the chopper circuit has an amplifier circuit width θ.

It is composed of an operational amplifier Rb, and its effects are also the same.

The difference is the excitation current detection means by the absolute value circuit mb. Resistor pb is not short-circuited by transistor 2, so resistor 2. The value of the excitation current is reduced by the voltage drop of ia, and a chopper action is performed.

Therefore, the excitation current of excitation coil (2) is larger than that of excitation coil (2) by a predetermined value.

Since the excitation coil ■ and the wind are in axially symmetrical positions, the rotor/
The vector of the radial force that attracts is in the direction of arrow A-/ in FIG.

Next, curves 6Ja and AJa in FIG. 7 are applied to the terminal 51b, liver 1 and terminal 3/c, Tc and terminal sid, 5its.

The electric signal of A'la is input to the condylar gland, and the excitation current at this time is as shown by the dotted line j4'b, c, and d, and the chopper action is performed in the same way.

Also, the excitation currents of excitation coils -2a, /'b, 2b are larger than those of excitation coils Iτ, 5, 5 by a predetermined value, so the direction of the force vector of arrow A-/ in Fig. 1 is the same. Yes, but it rotates clockwise by half a revolution.

Therefore, since the rotating shaft j in FIG. 1 rotates while being pressed by the bearing, the occurrence of mechanical vibrations is effectively suppressed.

In the next half rotation, the output of the right half terminal of ring counter Hiro 3 is obtained, so the transistor and non-conducting
Transistor xgb becomes conductive.

Therefore, the excitation current of the excitation coils ■, 2a, /'b, 2b is kept larger than that of the excitation coils ■, Ja, 1b, 2'b by a predetermined value, so the force vector in Figure 1 There is no change in the direction of A-/, and it rotates only half a turn. Therefore, the rotating axis relative to the bearing! This has the effect of suppressing mechanical vibration without changing the pressing force.

As can be understood from the above explanation, the above-described action continues and the effect is the same even during continuous rotation.

The excitation current curve jIAa in FIG. 7(b), ! Hirob,
There is a slight pull current acting on the chopper in the horizontal part of ....

It is omitted and not shown.

- If such a ripple current is large, the difference in the magnetic attraction force in the radial direction due to the magnetic poles located at axially symmetrical positions as described above will be large and include a pull torque, thereby inducing vibration. Therefore, it is necessary to make the frequency as high as possible.

If the time width of the rising portion of the dotted line curves -*4ca, -tg b , . . . is large, a torque reduction is generated. If the time width of the descending section is large, counter torque is generated.

Therefore, the width of the arrow 690 hours needs to correspond to the number of rotations.

In order to reduce the width of the rising part, connect the power terminals lhiroa, /
It is obvious that the voltage of 4'b should be increased.

When the excitation coil (2) is de-energized, the stored magnetic energy is transferred to the diodes 21b, 2 (2) and the resistor 22a.

It is returned to the power supply via Ua. Alternatively, it may be stored in a smoothing capacitor.

, The situation is the same for excitation coil (■).

At the same time, the excitation coils ja and 2a start being energized, so that the energy stored in the capacitor HiroI is used for rapid storage of magnetic energy.

Therefore, arrow 6 is the width of the rising and falling parts of the excitation current.
In order to reduce the width of the coil, it is necessary to increase the power supply voltage in accordance with the rotational speed.
The above-mentioned circumstances are exactly the same in the case of energization. Diode 2/c, 2/6. The effect of ... is also similar.

The output torque is controlled by the reference voltage ψg, and the rotational speed can be controlled in accordance with the power supply voltage, eliminating the occurrence of reduced torque and counter-torque, resulting in efficient operation even at high speeds. be.

The coil in Figure 3 (C)! By moving the positions of ra and ♂b to the left and right and adjusting them to positions where the maximum torque can be generated while each excitation coil is energized at 0 degrees, the output torque is maximized and the efficiency is also maximized.

As can be understood from the above explanation, there is an effect that the drawbacks of the reluctance type electric motor described above can be eliminated.

Another embodiment of the energization control circuit for a two-phase link-tance type electric motor will be described next with reference to FIG. 6(C).

The position detection signal is an aluminum rotor which rotates synchronously with the rotor /, which rotor is shown as symbol 3 in FIG. 3(C). Symbol Ja, 3b.

. . . are protrusions having an equal pitch and a width of /lA) degrees.

Coils 7a, 7a, 7b, 7b having the same configuration as coils ♂a, J'b are opposed to the protrusions 3a, 3b, . . . , and impedance is reduced due to eddy current loss. The separation angle between the coils 7a and 71 and between the coils 7b and 7b is /♂θ degrees. The width of the salient poles 3a, Jb,... is
There is no problem even if it is larger than 1tto degrees. However, it is up to about 30 degrees.

Using a circuit with the same idea as the electric circuit described later in Fig. 7(b), salient poles J a , j b ,...
A position detection signal is obtained when facing a.

These curves are curves j7a and j7 in Figure g(b).
b.

. . . is obtained by cutting out the part after the dotted line 4ja and Ajb, and its width is /Hiroo degree.

The position detection signal from the coil 7a is represented by a curve jqa.

59b, . . . after the dotted line is removed, resulting in a width of 1tAo degrees.

The position detection signals from the coils 71) and 7b are represented by curves S♂a, j, ... and curves 60a, &Ob, respectively.
... is cut out after the dotted line, resulting in a width of /ll-0 degrees.

The curves described above are shown in FIG. 7(b) with the same symbols. The curve with a width of 1IIo degrees with the distal end cut off will also be shown with the same symbol as the one before the cut off, and will be shown thereafter. 7th
The display in Figure (b) is such a display means.

Terminal in Figure 6 (C)! r3a, 33a are shown in Figure 7 (b
) is input, and the terminal! ;3b, 3;The curve 5qa is input to 3b.

Terminal S3c,! ;, ja and terminal! , 3d, and 336 respectively input the curve Szaa and the curve AOa in FIG. 7(b).

Transistors 20a, 20b, . . . , h are inserted at both ends of the excitation coils 1, 1b, 2a, 2b as shown.

The block circuits B and C perform the same function as the circuits with the same symbols in FIG. 6(b), which control the energization of the excitation coils 1, 2a, 2a, 2a, 2a, 2b, and 2b.

From the terminal IA7a, the first . Second
゜The electric signal of the curve of the third stage and the first stage is input.

When the power is turned on, the terminals 33a, ! , m, the curve j
When the electric signal 7a is input and there is a high-level output since the count value of the ring counter≠3, the transistor JCa becomes conductive and the transistor 2H C is kept non-conductive. Also, since the transistors Z□a and 20b become conductive, energization of the excitation coil ■ starts.

At the same time, the excitation coil ■ also starts to be energized, as shown in Fig. 7(b).
The excitation current rises as shown by the dotted line jja.

When the voltage drop across the resistor Ua due to the energization of the excitation coil ■ exceeds the input voltage (reference voltage width) at one terminal of the operational amplifier ψzaa, the output of the operational amplifier tAzaa changes to a high level, and the monostable circuit energize jJa and make its output high level. Therefore, the amplifier circuit Hirode a via the inverting circuit
The input becomes low level, and its output also becomes low level.

Therefore, the transistor becomes rapid.

The input voltage at the terminal of the operational amplifier≠za also drops, its output changes to low level, and after a short time the monostable circuit j
Since the output of Ja also changes to a low level, the output of the AND circuit u9a changes to a high level, and the excitation current increases again. When it increases, the output of the AND circuit 1Aqa becomes a low level again for a short time, and excitation is stopped. The current falls correspondingly.

This becomes a chopper ξ circuit that repeats the above-mentioned cycle.

The excitation current has a value controlled by the reference voltage spread.

At the end of curve j7a, terminal j, ? Since the input of a disappears, the output of the AND circuit 9a becomes low level, and the magnetic energy accumulated in the excitation coil is
, 21 b , charges the capacitor Hiro/ through the resistor na, and returns the current to the power supply. Therefore, the end of the dotted line jja drops rapidly.

The current applied to the excitation coil by the input signal of the terminal 3Ja also has a curve having the same shape as the dotted line 5sa. In this case, the chopper action is similarly performed by the operational amplifier 4t and the C9 monostable circuit S2c.

The difference is that the reference voltage ≠ the voltage being compared is
Transistor, ), 'A c is non-conducting, so resistor 22c
The voltage drop is the sum of 23c and 23c.

The resistances -ua, 2Jb, 2c, ), ,Zd are made equal, and the resistances a, υb, C1 and d are also made equal.

Therefore, the excitation current of excitation coil (2) is larger than the excitation current of excitation coil (2) by a predetermined value.

The rotor / rotates and the position detection signal j? a is shown by the dotted line ttb in FIG. 7(b).

Cho-8 action is performed in the same way, but the excitation coil lb
The excitation current of the excitation coil is larger than that of the excitation coil horse by a predetermined value.

Next, terminal 3; 3c,! ; When the electric signals of curves 5za and 6 (7a) in FIG. 7(b) are input to terminals jJd and 3c, respectively, the energization control of electrodynamic coils ja, 2a and excitation coils 2b and 2b is performed. The excitation current is shown as dotted lines J/;a, jAb in FIG. Therefore, transistor 2hiroa1.
2 is conductive, transistors 2'Ac, 2. Hiro d is held non-conductive.

Opamp I/-zasu, nephew d and monostable circuit! ;2b.

The chopper action by j, d, anp, C1≠9d, ≠9g, and μdeh is performed in the same manner, and the effects are also the same.

When the applied voltage is increased, the dotted lines 3; 3a, jj b,
! ; The rise and fall of the excitation current at the starting end and end of A a56b are rapid, and high efficiency is achieved at high speed, as in the case of FIG. 6(b).

When it rotates 360 degrees in electrical angle, the transistor 2 and 1.2 becomes non-conductive during the subsequent 360 degree rotation.
Transistors 24tc, 2<'d become conductive.

Therefore, the magnitude relationship of the currents flowing through the axisymmetric excitation coils described above is reversed. Therefore, the rotor l, which has a difference in total magnetic attraction force due to the axially symmetrical magnetic poles, rotates around the rotation axis j without changing its direction to the vector of the attracted radial force. j rotates while being pressed by the bearing, which has the effect of suppressing the occurrence of mechanical vibrations.

Therefore, the disadvantages of the reluctance type electric motor described above are effectively eliminated.

Next, an embodiment applied to a three-phase electric motor will be described.

FIG. 2(a) is a plan view showing the configuration of the salient poles of the rotor, the magnetic poles of the fixed armature, and the excitation coil of a three-phase reluctance type electric motor.

Symbol l is the rotor, its salient poles / 7 a, / 7 b
+... have a width of ixo degrees, and are arranged at equal pitches with a phase difference of 360 degrees.

The rotor is made by known means of laminating silicon steel plates. Symbol j is the rotation axis. On the fixed generator lB, magnetic poles /Ah, /6'b, /6C, - are arranged with the width /0 degrees and with equal separation angles.

The widths of the salient pole and the magnet are made equal at 110 degrees. The number of salient poles is /hiro, and the number of magnetic poles is 72.

FIG. 3(a) is a developed view of the reluctance type three-phase motor of FIG. 1(a).

The coil in Fig. 3(a) /Qa, /(7b, 10
c is a position detection element for detecting the position of the salient pole /7a + /71) *..., and the fixed armature /
6 side, and the coil surface has salient poles /7a, /7b
, . . . are opposed to the measurement surfaces of , .

The coils 10a, 1b, 10c are spaced apart by 1 degree.

The coil is an air-core coil with a diameter of J mm and about 100 turns.

In Fig. ≠(b), coils 10a, /□b, 10
From c, a device for obtaining a position detection signal is shown.

In Fig. j (b), the coil 10a and the resistor 15a
, 15b, /jc become a bridge circuit, and the coil 10
Adjustment is made so that when a is not facing the salient poles /7a, /7b, . . . , they are balanced.

Therefore, the output of the low-pass filter consisting of diode /2, capacitor /Ua, diode /1b, and capacitor /2b is low, and the output of operational amplifier /3 is low level.

Symbol 7 is an oscillator that oscillates at a rate of about 1/megacycle. Coil/□a is salient pole/7a,/7b.

When opposed to , the impedance decreases due to iron loss (eddy current loss and hysteresis loss), so the voltage drop across resistor 15a increases, and the output of operational amplifier/3 becomes high level.

The input to the block circuit is the curve 25 a + -15b + .
26b'+...

The block circuits 7c and 7d in FIG.
y shows a circuit similar to the bridge circuit described above, including the y files 10b and 10c.

Oscillator 7 can be used in common.

The output of the block circuit 7c and the output of the inverting circuit/3e are:
are input to the block circuits, and their output signals are g-th
In figure (a), songs 1127a, 27b,
...Curves 2zaa, 2gb, . . . are shown as follows.

The output of the block circuit 7d and the output of the inverting circuit/3f are:
are input to the block circuits, and their output signals are the rth
In figure (a), the curves γa, ノ? b,...Curve 3
It is shown as 0 a + 30 b *...

For curve 25 a, , Z5 b, -, song 12
7a, J7b.

... has a phase of 720 degrees (I, song 1fi27 a,
27 For b,..., curve j? a.2? b,
... has a phase difference of 120 degrees.

The block circuit is a circuit commonly used in the control circuit of a three-phase Y-type semiconductor motor, and when the above-mentioned position detection signal is input, a rectangle with a width of ISO degree is formed from the terminals a, ris, ..., ri f. It is a logic circuit that can obtain wave electrical signals.

The outputs of terminals A, S, and C are curves 7, , 7/b, -, and curve 32a, respectively, in Fig. g (a).
.

32b, . . . are shown as two curves 33a, JJb, . The outputs of terminals d, e, and f are g-th
In figure (a), the curves 1≠a, ? ψb,・
...1 song ffg3! ;a.

Jjb, . . 1 curves 36a, 3fb, . Output signal of terminal a and hair, output signal of terminal b and e, terminal C! The phase difference between the output signals of 7f is 1 gO degree.

In addition, the output signals of terminals 9a, ris, and ri C are sequentially delayed by ixo degrees, and the output signals of terminals ri d, ri e, and ri f are also the same <11 degrees.
4th/2nd OK I'm late. Coil 10a10b, 1
Instead of the opposing salient poles /7a, /7b, - of 0c, the first
The same effect can be obtained by using an aluminum plate of the same shape that rotates synchronously with the rotor l shown in the figure.

M! with a large number of salient poles as shown in Figure 3(a)! In the case of an electric motor, the use of coils 10a, 10b, and 10c degrades the resolution of position detection. In such a case, a magnetoresistive element may be used as a position sensing element.

The plastic magnet 6 in FIG. 3(a) is disc-shaped,
On the outer periphery, N and S@ poles of the same width as the middle salient poles are arranged as shown.

The number 0 indicates a cutout and a non-magnetic field area.

The rotor 6 is configured to rotate coaxially and synchronously with the rotor.

Magnetoresistive element! a, gb, 4! c are spaced apart from each other by 0 degrees and are fixed to the armature side (main body side) at the same phase position as the coils /(Ja, /(:lb, 10c), and the N of the rotor 6.

It faces the S magnetic pole.

When the magnetoresistive elements 4La, ≠b, ≠C enter the magnetic field of the N and S magnetic poles, their resistance increases, and this can be detected to obtain a rectangular wave position detection signal. Therefore, a three-phase position detection signal with high resolution can be obtained.

FIG. 2(b) is a plan view of the motor when the number of magnetic poles and salient poles in FIG. 2(a) is expressed as a percentage, that is, in the case of three-phase single-wave energization.

The symbol ja is a board on which the armature/6 is fixed, and is for fixing the motor to the main body using screw holes.

A developed view of FIG. 2(b) is shown in FIG. 3(b).

In FIG. 2(a), the annular portion /6 is fixed to an outer casing (not shown) and serves as an armature. The part with symbol /6 is the magnetic core which becomes the magnetic path. Symbol 16 and symbols /6a, /Ab,.

...is called an armature.

Although this embodiment is an adductor type, it can be configured as an abductor type.

In the developed diagrams of Fig. 3(a) and Fig. 3(b), the excitation coils ■, Ib,... are connected to the magnetic poles/A as shown in the figure.
It is wrapped around a, /Ab, .

In FIG. 3(a), when the excitation coils ■, ■, the excitation coils 2a, 2a, and the excitation coils Ja, Ja are successively energized with a width of 120 degrees, the excitation of the corresponding magnetic poles causes , the salient poles are attracted and drive the rotor / in the direction of the arrow.

Excitation coil 31), J't) and excitation coil /b.

When Ib and excitation coils xb and Σ1 are continuously energized with a width of 7.20 degrees, the salient poles are attracted by the excitation of the corresponding magnetic poles, causing the rotor l to move in the direction of arrow A. drive

The phase difference between the former and latter energized sections is 60 degrees.

In FIG. 3(b), excitation coils (1), (2), excitation coils 2a, 2a, and excitation coil 3a.

Since the coil is sequentially energized with a width of 120 degrees, the corresponding magnetic poles are excited, attract the salient poles, and drive the rotor in the direction of arrow A.

The energization control means for the excitation coil of the motor shown in the exploded view of FIG. 3(a) will now be described with reference to FIG. 6(a). Figure 3(a)
Excitation coils with symbols ■, Ja and 2a, 2h and J
a, Ja and Ib, wealth and cob, zb and 3b, 3b
indicate excitation coils located at axially symmetrical positions, excitation coils . The excitation coil of the second phase is shown.

In FIG. 6(a), excitation coil 2, 2a.

At both ends of 3a, transistors /qa, /qb,
... /9f is inserted as shown, and the DC power terminal /9f is inserted as shown in the figure.
lAa.

Power is supplied from /<4b.

The block circuit is for controlling the excitation current of the excitation coils 3b, Ib, 2b, and has the same configuration as the control circuit described above.

In the block circuit, F has the same configuration as the above-mentioned control circuit for controlling the energization of the excitation coil.

Symbols ≠♂a, ≠tb, φlrc, 4'zad are operational amplifiers, symbols 1AOa, IAob, sc, sud are absolute value circuits, resistors ua+-ZJa and resistors ub,,L? b and resistance, lj c, 13C and resistance, J, 2d, ZJ
It is for rectifying the voltage drop of d, that is, the voltage proportional to the excitation current, and the rectified outputs are input to one terminal of the corresponding operational amplifier.

The resistance values of the resistors na, 2jb, . . . , ud are the same, and the resistance values of the resistors l'a, nb, . The latter has a resistance value of about 2° of the former.

Counting is performed by the signal.

The input to the terminal 7a is the position detection signal 3a in Figure R (a).
, 2jb, . . . and the position detection signals of the curves shown in the three rows below are input, and the ring counter 'A3 is energized by differential pulses at the starting ends of these signals.

Curve 3■ of the time chart in FIG. 7(a), Ja.

33a, 36a, 3ψa,..., 7ja are shown in Fig. 2(a)
The terminal in Figure 6(a) shows the electrical signal curve with the same symbol! ; Oa, j (7b, 30c are input with electrical signals of curves J■, , 72a, 33a, respectively, AND circuit≠9a, 1A9b, ?-90
The corresponding transistor is energized through the .

When the power is turned on, the rotor / in Figure 3 ((rotation) is at a position /!θ degrees moved to the left from the position shown in the figure, and the output of the ring counter ≠ 3 is the output of the count value / is obtained,
A case will be described in which the transistors 2'Aa and 2H are conductive, and the transistors 2'Ac and 2'Ad are kept non-conductive.

At this time, the terminal! ; □a, j (from 7a, Figure 7 (
, )'s song iJ■ is input. Therefore, the excitation coils ■ and ■ are energized.

At this time, the terminal! ;Of,! Of already has the song H.
Since the electric signal 3s (FIG. 7(a)) is input, the excitation coils 2b, 2b are energized.

Therefore, salient poles /7a and /7h in Fig. 3(a) are magnetic poles /6a
.

/AaK is attracted and suddenly! /7g, /7n are magnetic poles /6
f.

Attracted by n, the rotor / is driven in the direction indicated by the arrow.

When rotated by 60 degrees, the electric signal of curve 3.3 disappears, so the excitation coil 2b is de-energized, and the terminals soa,
, so6, the electric signal of curve 3Aa is input, so the exciting coils 3b and T'''b are energized, and the salient poles /7b,
/71 is attracted to the magnetic pole /6b, -, and a driving force in the same direction is obtained.

Next, when rotated 60 degrees, the electric signal of curve j■ disappears, so the excitation coils ■ and ■ are de-energized, and terminal 3; ob
, sob, the electric signal of the curve 32a is input, the excitation coils 2a and 5 are energized, and a driving force in the direction is obtained.

For each next 60 degree rotation, terminal 309. Curve 3qa on anti-bow
The electric signal of the curve 33a and the electric signal of the curve a3ta are input to the terminals j50Q and j50c, and the electric signal of the curve a3ta is input to the terminal 3of, and the corresponding excitation coil is energized,
The rotor / is rotated.

Next, details of energization of the above-mentioned excitation coil will be explained. At the beginning of energization of the excitation coil ■, the rise is delayed due to the inductance, and the point i in Fig. 7(a), ? ? It becomes like a.

On the right side, the stored magnetic energy of the excitation coil is released through the diodes 2 and 2/b, so the dotted line, ? 7b.

The above-described circumstances are the same for the other excitation coils: excitation coils 2h, Ja, and excitation coil Ja.

The energization curve according to No. 8 is shown by dotted lines 39a and 3qb.

The energization curve of the exciting coil due to the position detection signal white coat 36 a, , 3≠a, jja is also shown by a dotted line.

The width of the descending part of the energization curve in the section indicated by arrow 3b is 3
When the angle exceeds 0 degrees, a counter torque is generated and a reduced torque is generated at the rising portion, making high speed operation impossible.

In this example, as in the previous example, the power supply voltage is increased,
By using a capacitor, high-speed operation is possible. Since the number of excited magnetic poles is μ, the output torque is increased and high speed can be achieved.

The excitation coil ■ starts to be energized, and the dotted line in Fig. 7(a)
? However, since the voltage drop across the resistor L2a is input to one terminal of the operational amplifier ψzaa via the absolute value circuit LAoa, when the value exceeds the reference voltage φg, the operational amplifier The output of ψza becomes low level, the output of AND circuit 'Aqa also becomes low level, and transistors /qa and /9b become non-conductive. Excitation coil■
The stored magnetic energy of diode )'2■, resistor u
a,! The current is returned to the power supply via Ja, and the capacitor lA
/ is charged, and the current drops rapidly. When the current drops to a predetermined value, the output of the operational amplifier Hirozaa returns to high level due to the hysteresis characteristic of the operational amplifier lAzaa, and the output of the amplifier circuit back a is set to a high level again, and the transistors /9'a, /qb becomes conductive and the current increases.

When the current value reaches the value set by the reference voltage φ, transistors /qa and /9b become non-conductive and the current drops.

This results in two circuits that repeat the above-mentioned cycle.

The section indicated by the arrow 3a (FIG. 7(a)) is the section where the chopper action occurs.

The excitation coil ■ is also energized in the same phase, and the operational amplifier 'Agc,
An1 circuit ≠ qg absolute value circuit l1-oC, resistor UC.

A little 2 actions are performed by the lc, and the excitation coil ■
The same energization is performed.

At this time, the ratio fl to the excitation current to be compared with the reference voltage spread is
The voltage for J is transistor 21! Since -c is non-conductive, the voltage drop is the sum of the resistance values of resistors 22c and 23c.

Therefore, the excitation current to the excitation coil is kept smaller than that of the excitation coil (2) by a certain value, so as shown in Fig. 3(a).
The magnetic attraction force in the radial direction between the magnetic shadow /Aa and the opposing salient pole is larger than that between the magnetic pole τ and the opposing salient pole located at axially symmetrical positions.

The difference between the two is in the direction of vector A-/ in FIG. 2(a).

Other excitation coils, 2a, 2a and excitation coil Ja.

Blue and exciting coil i1:, ib and exciting coil λb, ,
The above-mentioned circumstances are similar for zb and excitation coil Jl>, J'b, and excitation coil core a, which is located in an axially symmetrical position,
The excitation currents of Ja, jb, jb, and J'b are
T1. Wealth, jt), jl) is larger than that by a predetermined value. Therefore, the force vector of the difference in magnetic attraction is the rotation axis!
Rotate around the axis of rotation! Since it rotates while being pressed against the bearing, it has the same effect as the previous embodiment in that the generation of mechanical vibrations is suppressed.

6 steps of rotation of rotor l every 60 degrees, i.e. 3 in electrical angle
When the rotation of 60 degrees is completed, the output of the ring counter≠3 becomes the output of the 6 terminals on the right side, and the transistor: 1Q-e
,, 2 hirosu is non-conductive, transistor 2 hirosu C2,2! d
is conductive. Therefore, the magnetic pole with a large magnetic attraction force in the radial direction changes from the one on the right half circumference of Figure 2 (al) to the one on the left half circumference, so that the force with which the rotating shaft j is pressed against the bearing is 4 k. have the same orientation and are further rotated to have the same effect.

Other effects are the same as in the previous embodiment.

Since the electric motor shown in the developed diagram of FIG. 3(b) is energized with one- and three-phase single waves, the block circuits of FIG.
Hiro9f, Hiro9j, lA9, ≠91. Opeanzo ψzasu.

Hiroza d, absolute value circuit IA0b, 4Ql, resistor J, 21
), ud.

ub, l? d,) Langimeta 2. Hirosu, x<<
a) is the removed energization control circuit and excitation coil ■
, 2a.

The energization control of ja, ■, 2a, and Ja is performed.

Ring counter Hiro 3 has 6 output terminals, 3 on the left
The outputs of these transistors turn on the transistor 2hiroa, and the three outputs on the right side turn on the transistor 2hiroC. The input of the OR circuit tA7 is the curve ua of FIG.
Δb,...4 curve 27a, core b,...9 curve 2t
■、2? It becomes an electrical signal of b...

The effect is the same as that in FIG. 3(a), but the output torque is reduced.

The solid line/slag torque curve in Figure R (a) is shown in Figure 3 (b).
It's something you can ride.

Arrows a and a indicate excitation coils 2a, respectively.

2 and excitation coil/1), and the torque curves due to jb, both of which are superimposed. Therefore, mechanical vibration is further reduced than in the case of three-phase single-wave energization.

The chopper ξ circuit of the embodiment shown in FIGS. 3(a) and 3(b) may use other means, but the higher the chopper frequency is, the less mechanical vibration will occur.

〔effect〕

First effect.

The generation of mechanical vibration and noise due to the imbalance of the radial magnetic attraction force due to the difference in air gap between the two object-symmetrical magnetic poles and the salient pole is suppressed.

Second effect.

Machine movement and noise caused by wear between the rolling sols and rolling grooves of the ball bearing that supports the rotating shaft are suppressed.

Third effect.

Depending on the applied voltage, a high speed electric motor can be achieved.

The output torque can be controlled independently from the reference voltage ξ.

[Brief explanation of the drawing]

Figure 1 is a plan view of a two-phase glue roughtance type motor;
The figure is a plan view of a three-phase reluctance motor, and Figure 3 is
Magnetic pole and salient pole single rotor of the device of the present invention. A developed diagram of the excitation coil, Figure 5 is an electric circuit diagram for obtaining a position detection signal, Figure 5 is an explanatory diagram for flattening the output torque, and Figure 6 is an energization control circuit diagram of the excitation coil. FIG. 7 shows a time chart of the position detection signal and the excitation current generated therefrom, and FIG. R shows a time chart of the position detection signal, the excitation current, and the output torque. / , /7a, /7b, - rotor and salient poles,
/Hiroa+/4'b...Power supply positive and negative terminals, 7...
・Oscillator, 7c, 7d, ri... block circuit,
/,7. /ja+/3'F), ... operational amplifier, /A, /6a, /6b, -16f
, /Aa, /AI), -tt, t-41 machine pole, ■, Ja, ja, ■, 2a, Ja, /b. 2b,! b, Ib, 2b, O...excitation coil, j, j
a, jb, - rotor and protrusion, 6.6a,
6 b, - rotor and magnetic poles, A! ; a, Aj
b, -=tSd...flip-flop circuit,
jja, tj'b. ...jJd, ≠d, 4o, ..., ≠g-formula... Differential circuit, ≠a, ≠b, ≠C... Magnetoresistive element,
! ... Rotating axis, Ia, ♂b, 7a, 7b, 7a,
'b. 10a, /(7b, 10a - position detection coil, /9a. lde'b, -, /9f, 2'Aa, 21Ab
,−,21Atl,20a. xob, ・, xOh-) transistor, IAO
a, IAOb...tAOd...absolute value circuit,
Hirozaa, ←zasu, ..., φzadol, operational amplifier,
'/-9a, ≠? b,..., Hiro91...AND circuit, B-0, D, E, F, ()...Block circuit for exciting current control, ≠3...Ring counter, Hiro7...・OR circuit, ≠! ...Reference voltage, 39a, Jqb, -,? ? a...? 7b,
-, 'A6.1AAa, -tea54Cb, -j
ja, jjb, jAa', job, - excitation current curve, #a, zb, -, 2Aa, 2A
b, -., core a. 27b, -, 2zaa, 21rb H"',
* 'Demi r 29 b r ”' *
J (7a, 30b, -'-, 3■, 31b
,"',32a,32b,"'J,? a
,33b,---,3'Ah,,7@b,-
, jja, 33;b. -, JAa, 3Ab, -, j? a, job
,--,! ;ga,! ;zab, -, J'? a
,jqb ,-,GOa, ,60b ,-=
,lr/a. 6/b, ---, 6Ja, 62b, -j, 7
a,Ajb,-,1rlAa,64(b,...
7 position detection signal curve, Hiro! , altar, town...torque curve.

Claims (2)

[Claims] (1) In a two-phase reluctance motor, the first
The excitation coils wound around a set of two magnetic poles located at axially symmetrical positions of the first phase are called excitation coil 1a and excitation coil ■, respectively. The excitation coils wound around the other magnetic poles are respectively excitation coils 1b.
, excitation coils 2 and 2a, 2a and 2b, respectively, are excitation coils wound around the magnetic poles of two systems of two systems, which are also located at axially symmetrical positions of the second phase.
When the excitation coil is called 1a, 2a, 1b, 2b, 1a, 2b, 2b, 2a, 2b,
A fixed armature arranged in the order of ■, The position of the pole is detected and the first and second position detection signals of the first phase and the third and second position detection signals of the second phase are output.
a position detection device that obtains a fourth position detection signal;
, the second and fourth position detection signals, the symbol (1
a, ■), (2a, ■), (1b, ■), (2b, ■)
A first energization control circuit that cyclically energizes the excitation coils in order, and a chopper circuit that controls the energization current of each excitation coil, each of which has a first setting value or a second setting that is larger than this by a predetermined value. In the cyclic energization mode of the excitation coil described above, the second energization control circuit maintains the energization current at the first set value and the second set value. and a third energization control circuit that switches and changes according to the energization mode and controls the excitation current so that the vector of the radial magnetic attraction force between the magnetic pole and the salient pole always rotates in the same direction. A reluctance type electric motor characterized by being composed of: (2) In a three-phase reluctance type electric motor, the excitation coils wound around a set of two magnetic poles located at axially symmetrical positions of the first phase are called excitation coil 1a and excitation coil ■, respectively. The excitation coils wound around the other two magnetic poles located at positions symmetrical to the axis of the phases are excitation coils 1b and 1b, respectively.
Excitation coils 2a and 2b and 2b and 2 are called excitation coils 2a and 2b, and 2a and 2b, 2 are excitation coils wound around the two systems of magnetic poles of two systems, which are also located at axially symmetrical positions of the second phase.
), and when the excitation coils wound around two sets of two systems of magnetic poles located at axially symmetrical positions of the third phase are respectively referred to as excitation coils 3a, ■ and excitation coils 3b, ■. A fixed armature arranged with magnetic poles in a predetermined order at equal pitches on the circumferential surface, and a plurality of magnetic salient poles arranged at equal pitches facing each magnetic pole with a slight air gap. and detects the position of the salient poles and generates first and second position detection signals of the first phase, third and fourth position detection signals of the second phase, and a third position detection signal of the second phase. The fifth phase of
, a position detection device that obtains a sixth position detection signal, and the first, second, and third position detection signals, respectively with symbols (1a,
■), (2a, ■), (3a, ■) excitation coils are cyclically energized in this order, or the first, second,
..., the symbol (1) is detected by the sixth position detection signal, respectively.
a, ■), (1b, ■), (2a, ■), (2b, ■)
, (3a, ■), and (3a, ■) in a predetermined cyclical manner, and a chopper circuit controls the energizing current of each exciting coil to set the respective first settings. A second energization control circuit maintains the energization current at the current value or a second set value larger than this by a predetermined value, and the energization current of the two excitation coils located at axially symmetrical positions in the cyclic energization mode of the excitation coils described above. is changed to a first set value and a second set value in accordance with the energization mode, and the excitation current is changed so that the vector of magnetic attraction force in the radial direction of the magnetic pole and salient pole always rotates in the same direction. A reluctance type electric motor characterized by comprising a third energization circuit that controls the reluctance type electric motor.