JPH07312896A - Three-phase reluctance motor - Google Patents

Abstract

PURPOSE:To rotate at a high speed by setting an air gap between an armature pole and a rotor salient pole to a predetermined value or less, charging the magnetic energy of an armature coil in a capacitor to abruptly drop a current, and abruptly rising the armature coil to be conducted next by utilizing the high voltage of the capacitor. CONSTITUTION:When an air gap between end faces 6a and 6b is set to 1/10mm or less, a main magnetic flux 25b becomes perpendicular to the end face and does not contribute to a torque. Since the torque becomes only by leakage magnetic fluxes 25a, 25c and the reluctance of a magnetic circuit is reduced, and hence an output torque is increased. When the energization is further interrupted, the energy stored in an armature coil 39a is charged in a capacitor 27a via diodes 21b, 21a by a reverse current preventing diodes 49a-1 to become a high voltage. Accordingly, the magnetic energy is abruptly eliminated, and the current is abruptly dropped. When it is then energized, the charged voltage of the capacitor 47a is added to a power source voltage to abruptly rise the current of the coil 39a.

Description

Detailed Description of the Invention

[0001]

[Industrial application] It has a wide range of uses as a power source with a large output and a long service life. Electric cars,
It can be used for electric bicycles, cranes, vacuum cleaners, etc.

2. Description of the Related Art A reluctance type electric motor has a large output torque, but it has not been put into practical use due to its drawbacks such as a low rotation speed and vibration. Although the output torque is large as described above, there is a problem that a linear proportional relationship cannot be obtained between the energized current and the output torque.

[0002]

The first problem is that there is no linear proportional relationship between the applied current and the output torque. It is necessary to configure the relationship between current and torque as in a magnet motor. Second problem In the case of a reluctance type motor, since the magnetic path of the armature coil is almost closed between the magnetic poles of the salient poles and the magnetic poles, the inductance is large, so that the magnetic poles and salient poles are accumulated or released. The amount of magnetic energy generated is large, and the number of accumulations and discharges per revolution is large. Therefore, although the output torque is large, there is a problem that the output torque is low. When the electric motor has a large output, it becomes more difficult to solve the above-mentioned problems. Third Problem FIG. 1 is a plan view of a well-known three-phase single-wave energized reluctance motor. Reference numeral 16 is a fixed armature, which is made of a laminated body of silicon steel plates, and the magnetic poles 16a, 16b, ... Have armature coils 17a-.
1, 17b-1, ... Are mounted. The rotor 1 rotates in the direction of arrow A. Symbol 5 is a rotation axis. Armature coil 1
When 7b-1 and 17e-1 are energized, the rotor 1 rotates in the direction of arrow A, and energization is stopped when it rotates 120 degrees in electrical angle, and then armature coils 17c-1 and 17f-1 are energized. When the electrical angle is 120 degrees, it rotates the same angle. As described above, the armature coils 17a-1 and 17d
-1 → 17b-1, 17e-1 → 17c-1, 17f-
It is rotated in the direction of arrow A by energization in the order of 1. Two salient poles are involved in the above-described rotation torque, and the other four are not involved. If six salient poles simultaneously generate torque, the torque will be tripled, but there is a problem that this cannot be achieved. Fourth Problem When the armature coils 17a-1 and 17d-1 are energized, the magnetic poles 16a and 16d are attracted radially to the salient poles 1a and 1e, so that the fixed armature 16 is deformed and distorted by the attraction force. . The magnetic poles 16b and 16e and the magnetic pole 16 are rotated.
The fixed armature 16 is deformed by the attraction between the c and 16f and the opposing salient poles. There is a problem that such deformation causes vibration. Further, since it is technically difficult to make the gap between the salient poles and the magnetic poles constant, the suction force received by the rotor 1 changes with rotation, and the rotor 1 vibrates in the radial direction. Therefore, there is a problem that vibration noise is generated and the service life of the bearing of the rotating shaft of the rotor 1 is shortened. If the device is large and has a large output, it is difficult to solve the above-mentioned problems.

[0003]

In a three-phase reluctance motor, n salient poles (n is a positive integer of 2 or more) arranged on the outer peripheral surface of a magnetic rotor at equal intervals and at equal separation angles. And 3n slots arranged in the inner peripheral portion of the cylindrical fixed armature at equal spacing angles, and 3n first, second, and third slots respectively mounted in two adjacent slots. And a device for supporting the salient poles and the fixed armature inner peripheral surface so as to face each other through an air gap of 1/10 mm, and detecting the rotational position of the salient poles. , The phase detection signal of the first phase separated by 240 degrees from each other with an electrical angle width of 120 degrees and the phase detected from these by 12 electrical degrees.
A position detecting device which can obtain a position detecting signal of the second phase which is delayed by 0 degree and a position detecting signal of the third phase which is 120 degrees in phase in terms of an electrical angle, and the first, second and third positions. Semiconductor switching elements serially connected to each phase armature coil, DC power supply for supplying serial connection of each armature coil and semiconductor switching element, and position detection of first, second, and third phases An energization control circuit that energizes the armature coil by energizing the armature coil by connecting the semiconductor switching elements connected in series to the armature coils of the first, second, and third phases via signals for the width of the position detection signal, respectively, and the semiconductor switching element. When is turned off at the end of the position detection signal, the magnetic energy accumulated by the armature coil via the diode is transferred from the connection point between the semiconductor switching element and the armature coil. An electric circuit that rapidly charges the current flowing through the armature coil by charging and holding it in the capacitor of the capacity and an armature coil that is energized next when the magnetic rotor rotates by a set angle When the width is energized by the position detection signal, the energization is started, and at the same time, the electrostatic energy accumulated in the small-capacity capacitor is caused to flow into the armature coil to increase the rise of the energizing current. It is composed of a rapid electrical circuit.

[0004]

[Operation] First, since the air gap between the armature magnetic pole and the rotor salient pole is within 1/10 mm, the relationship between the current and the output torque is linearly proportional and is not saturated, so that a large output torque is obtained. Is obtained. Second Action In the device of the present invention, when the armature coil is de-energized, the magnetic energy of the armature coil is charged into the small-capacity capacitor to accelerate the current drop, and the high voltage of the capacitor is used. The rise of energization of the armature coil to be energized next is made rapid. Therefore, a high-output electric motor, that is, an electric motor having a large diameter and a large number of salient poles can be rotated at high speed.

Third Action Since all of the salient poles of the rotor contribute to the output torque without stopping, there is an action of obtaining a large output torque. Fourth Action Since all salient poles of the rotor are magnetically attracted radially outward, vibration is prevented.

[0006]

EXAMPLES Next, details of the apparatus of the present invention will be described with reference to examples. Since the members with the same symbols in each drawing are the same members, duplicate description will be omitted. In FIG. 2, a cylindrical fixed armature 16 is fixed inside the outer casing 9. Fixed armature 1
6 is made by a well-known means in which silicon steel plates are laminated. Six slots are arranged on this inner peripheral surface at equal spacing angles, and an armature coil is wound and mounted in each slot. Armature coils are wound around the slots 17a and 17b, and are mounted in two slots separated by 120 electrical degrees. All angles are electrical. Slot 17
Armature coils are also wound around b and 17c and slots 17c and 17d, respectively. The other armature coils have the same structure and are wound and mounted in the adjacent slots. Outer case 9
A rotary shaft 5 is rotatably supported by bearings on both sides of the magnetic body rotor 1 and is fixed to the rotary shaft 5. The rotor 1 is made of a silicon steel plate laminated body like the fixed armature 16. Rotor 1
The salient poles 1a, which are 180 degrees apart and 180 degrees apart,
1b is provided so as to project, and its outer circumference faces the magnetic poles 16a, 16b, ... Through a gap of about 7/100 millimeters.

A developed view of FIG. 2 is shown in FIG. The left side of the dotted line B is a development view of FIG. The rotor is shown as symbol 1 and the fixed armature as symbol 16. In FIG. 4, the armature coil wound around the slots 17a and 17b can be represented as the lowermost armature coil 9a. Slots 17b, 1
The armature coil wound around 7c can be represented as armature coil 9c. Similarly, the other armature coils have the symbol 9e,
It can be displayed as 9b, 9d, and 9f. Armature coil 9
a and 9b are connected in series and supplied from terminals 8a and 8d. Armature coils 9c and 9d and armature coils 9e and 9
f is also connected in series, and terminals 8b and 8e and terminal 8 are
Power is supplied from c and 8f. The armature coils are separated by 120 degrees, and the armature coils 9a and 9b and the armature coils 9c and 9 are separated.
d and armature coils 9e and 9f are armature coils of the first, second and third phases, respectively. When the rotor 1 moves to the left by 120 degrees and is stopped, when the first-phase armature coils 9a and 9b are energized, the salient poles 1a and 1b become magnetic poles 16
It is magnetically attracted by a and 16d and rotates in the direction of arrow A. When the armature coils 9c and 9d (the second-phase armature coils) are energized, the energization is stopped when rotated by 120 degrees, and the energization is further rotated to the right. When the armature coils 9e and 9f of the phase are energized, they further rotate to the right. As can be seen from the above description, when the first, second, and third phase armature coils are sequentially energized for a section of 120 degrees, the rotor 1 rotates in the direction of arrow A and is a three-phase single-wave reluctance type. Become an electric motor.

A salient pole 1c can be added to form a three salient pole. In this case, the dotted line B moves 360 degrees to the right.
The number of salient poles can be two or more salient poles, and the output torque increases proportionally. In the case of the electric motor of FIG.
Although there are six salient poles 1a, 1b, ..., Two are effective for output torque. According to the means of the present invention, since the output torque can be obtained from the six salient poles, the output torque is tripled. In the case of the conventional electric motor shown in FIG. 1, the fixed armature 16 is deformed by receiving the magnetic attraction force in the directions of arrows 4-1 and 4-4 by the salient poles 1a and 1e.
When rotated by 20 degrees, the salient poles 1b and 1f cause arrows 4-2 and
It is deformed by the suction force in the direction 4-5, and when it is then rotated 120 degrees, it is deformed by the suction force in the directions of arrows 4-3 and 4-6. Therefore, the fixed armature 16 has a drawback that the direction of deformation changes with rotation and generates vibration. In the device of the present invention, when the salient poles are three or more, an attractive force is simultaneously generated in all of them, so that the fixed armature 16 only generates a compressive force in the same circumferential direction and is not deformed. Therefore, generation of vibration is suppressed. There is an action effect. The polarities of the magnetic poles magnetized by the armature coil are magnetized so that the magnetic poles located at axially symmetrical positions in FIG. 2 have different polarities.

A plan view of the rotor 1 having four salient poles is shown in FIG. In FIG. 3, the slots 17a, 17
The armature coils are attached to b, ..., 171 in the same manner as the slots of FIG. 2, and the three-phase armature coils are energized,
The salient poles 1a, 1b, ... 1d of the rotor 1 are attracted to rotate in the direction of arrow A. At this time, the direction of the force that attracts the armature 16 is in the directions of the arrows 9a, 9b, 9c, and 9d, so the forces that distort the armature 16 disappear in a balanced manner. Therefore, the defect that the armature 16 is attracted to the salient poles 1a and 1b and is distorted as in the embodiment of FIG. 2 is eliminated. Therefore, the embodiment of FIG. 2 can be implemented only in the case of a small output electric motor having a small output and a small suction force.

Next, the energization control means of the armature coil driven by the fixed armature 16 facing the rotor 1 shown in FIGS. 2 and 3 will be described. The armature coils 9a and 9b in FIG. 4 are referred to as armature coils 39a, armature coils 9c and 9d, and the armature coils 9e and 9f are referred to as armature coils 39b and 39c, respectively. The rotor 3 of FIG. 4 is configured to rotate coaxially with the rotor 1 and is made of a conductor such as aluminum. The salient poles 3a, 3b, 3c ... Have a width of 180 degrees,
It rotates in the relative phase shown. Coils 10a, 10b, 1
Reference numeral 0c is a position detecting element for detecting the positions of the salient poles 3a, 3b, ..., Which is fixed to the armature 16 side at the position shown in the drawing.
The coil surface faces the side surfaces of the salient poles 3a, 3b, ... Through a gap. The coils 10a, 10b, 10c have 120
Are separated. The coil is an air-core coil with a diameter of 5 mm and about 30 turns. In FIG. 6, the coils 10a, 10
b and 10c, a device for obtaining a position detection signal is shown. In FIG. 6, a coil 10a, resistors 15a, 1
5b and 15c form a bridge circuit, and are adjusted so as to be balanced when not facing the coil 10a or the salient poles 3a, 3b, .... Therefore, the diode 11a, the capacitor 12a and the diode 11b, the capacitor 1
The outputs of the low-pass filters composed of 2b are equal, and the output of the operational amplifier 13 is at a low level. Reference numeral 10 is an oscillator, which oscillates about 2 megacycles. Coil 1
When 0a faces the salient poles 3a, 3b, ..., Impedance decreases due to copper loss, so that the voltage drop of the resistor 15a becomes large and the output of the operational amplifier 13 becomes high level.

The input of the block circuit 18 is the time chart curves 45a, 45b, ... Of FIG. 11, and the input through the inversion circuit 13a is the inversion of the curves 45a, 45b ,. Block circuits 14a and 14b of FIG.
Shows the same configuration as the above-mentioned block circuit including the coils 10b and 10c, respectively. Oscillator 1
0 can be commonly used. Block circuit 14a
Of the block circuit 18 and the output of the inverting circuit 13b.
, And their output signals are the inversions of the curves 46a, 46b, ... And the curves 46a, 46b ,. The output of the block circuit 14b and the output of the inverting circuit 13c are input to the block circuit 18,
These output signals are represented by the curves 47a, 4 in FIG.
7b, ... And the reverse of this. Curve 45a,
The phases of the curves 46a, 46b, ... Are delayed by 120 degrees with respect to 45b, ..., And the phases of the curves 47a, 47b ,.
The block circuit 18 is a circuit commonly used in a control circuit of a three-phase Y-type semiconductor motor, and a rectangular wave electric signal having a width of 120 degrees is obtained from the terminals 18a, 18b, 18c by inputting the position detection signal described above. It is a logic circuit. Terminal 1
The outputs of 8a, 18b and 18c are shown in FIG. 11 as curves 48a, 48b, ... 49a, 49b, ..., Curves 50a, 50b ,. Terminal 18a,
The output signals of 18b and 18c are 1 in sequence with a width of 120 degrees.
20 degrees behind.

The energizing means of the armature coil will be described below with reference to FIG. Transistors 20a, 20b and 20 are provided at both ends of the armature coils 39a, 39b and 39c, respectively.
c, 20d and 20e, 20f are inserted. The transistors 20a, 20b, 20c, ... Are switching elements and may be other semiconductor elements having the same effect. Power is supplied from the DC power source positive / negative terminals 2a and 2b. When an input signal on the lower side of the AND circuit 41a is at high level and a high-level electric signal is input from the terminal 42a, the transistors 20a and 20b become conductive and the armature coil 39a is energized. Similarly, the terminals 42b, 42
When a high-level electric signal is input from c, the transistors 20c and 20d and the transistors 20e and 20f become conductive, and the armature coils 39b and 39c are energized.
The terminal 40 is a reference voltage for designating the exciting current. The output torque can be changed by changing the voltage of the terminal 40. When a power switch (not shown) is turned on, the input of the negative terminal of the operational amplifier 40b is lower than that of the positive terminal, so the output of the operational amplifier 40b becomes high level, the transistors 20a and 20b become conductive, and the voltage is changed to the armature coil. 39a is applied to the energization control circuit. The resistor 22a is a resistor for detecting the exciting current of the armature coil 39a. Symbol 30a is an absolute value circuit.

The input signal of the terminal 42a is the position detection signals 48a, 48b ... In FIG. 11, and the input signal of the terminals 42b, 42c is the position detection signals 49a, 49b ,.
0b, ... 1 of the position detection signal curve described above
One is shown as a curve 48a in the first stage of the time chart of FIG. The width of this curve 48a is the armature coil 3
9a is energized. The arrow 23a indicates a conduction angle of 120 degrees. In the initial stage of energization, the rise is delayed due to the inductance of the armature coil, and when the energization is cut off, the stored magnetic energy causes the diodes 21a and 21b to turn on when the diode 49a-1 of FIG. 8 is removed. Since it is refluxed to the power supply via the
Descends like the second half of. Since the section where the positive torque is generated is the section of 180 degrees indicated by the arrow 23, the counter torque is generated and the output torque and the efficiency are reduced. At high speeds, this phenomenon becomes extremely large and unusable. This is because the time width of anti-torque generation does not change even at high speeds, but the time width of the positive torque generation section 23 decreases in proportion to the rotation speed. The above-mentioned circumstances are the same for the energization of the armature coils 39b, 39c by the other position detection signals 49a, 50a. Since the rising of the curve 25 is delayed, the output torque is reduced. That is, a reduction torque is generated. This is because the magnetic path is closed by the magnetic poles and the salient poles, and thus has a large inductance. The reluctance type electric motor has the advantage of generating a large output torque, but has the drawback of not being able to increase the rotation speed because of the above-described generation of the counter torque and the reduced torque. A well-known means for eliminating such a drawback is to advance the phase of the salient pole before entering the magnetic pole and start energizing the armature coil.

When the phase-advancing current is applied, the inductance of the magnetic pole is remarkably small, so that it rapidly rises. Descend to. Therefore, there is a drawback that the output torque is reduced. In the case of the forward and reverse operation, there is a drawback that the number of position detecting elements is doubled. The device of the present invention is composed of diodes 49a-1, 49b-1, 49c-1 and a capacitor 47 for preventing backflow shown in FIG.
It is characterized in that the above-mentioned drawbacks are eliminated by attaching a, 47b, 47c. Curve 48
When the energization is cut off at the end of a, the magnetic energy stored in the armature coil 39a is transferred to the backflow prevention diode 49a.
-1 prevents the diode 21 from flowing back to the DC power supply side.
The capacitor 47a is charged to the polarity shown in FIG. Therefore, the magnetic energy disappears rapidly and the current drops rapidly.

The time chart curves 26a, 26 of FIG.
Reference numerals b and 26c are current curves flowing through the armature coil 39a, and the distance between the dotted lines 26-1 and 26-2 on both sides thereof is 120 degrees. The energizing current rapidly drops as shown by the curve 26b to prevent the generation of anti-torque, and the capacitor 47a is charged to a high voltage and held. Next, according to the position signal curve 48b, the transistors 20a and 20b are turned on and the armature coil 39a is turned on again. The applied voltage at this time is
Charging voltage and power supply voltage of the capacitor 47a (terminals 2a, 2
Since the voltage of b) is added, the rise of the current of the armature coil 39a becomes rapid. Due to this phenomenon, the curve 26
It rises rapidly like a. As described above, the generation of the reduced torque and the counter torque is eliminated, and the current is supplied in the shape of a rectangular wave, so that the output torque is increased.

Next, the chopper circuit will be described. When the current of the armature coil 39a increases and the voltage drop of the resistor 22a for detecting it increases and exceeds the voltage of the reference voltage terminal 40, the lower input of the AND circuit 41a becomes low level. The transistors 20a and 20b are turned off and the exciting current is reduced. Due to the hysteresis characteristic of the operational amplifier 40b, the operational amplifier
The output of 0b returns to the high level and the transistor 20
The exciting current is increased by connecting a and 20b. By repeating this cycle, the exciting current is maintained at the set value. Figure 7
The section indicated by the dotted line 26c is the section where the chopper control is performed. The height of the dotted line 26c is regulated by the voltage of the reference voltage terminal 40. The armature coil 39b shown in FIG.
Position detection signal curves 49a, 4 input from the terminal 42b
9b, ... allow transistors 20c, 20
It is energized by conduction of d, and the operational amplifier 40c and the resistor 22 are connected.
b, the absolute value circuit 30b, and the AND circuit 41b perform chopper control. The effects of the diode 49b-1 and the capacitor 47b are similar to those of the armature coil 39a. The above-mentioned circumstances are exactly the same for the armature coil 39c, and the position detection signal curve 5 of FIG.
0a, 50b, ... Are input to control the energization of the armature coil 39c. Transistors 20e, 20f, AND circuit 41c, operational amplifier 40d, resistor 22c, absolute value circuit 30c, diode 49c-1, capacitor 47.
The action and effect of c are exactly the same as those described above.

The energization of each armature coil may be performed either at the point where the salient pole enters the magnetic pole or at a point slightly before. Adjustment is performed in consideration of the rotation speed, efficiency, and output torque, and the positions of the coils 10a, 10b, and 10c serving as position detection elements fixed to the fixed armature side are changed. As can be understood from the above description, a large output and high-speed rotation can be efficiently performed as a three-phase single-wave electric motor, so that one object of the present invention is achieved. Ripple occurs in the output torque because it is a three-phase, single-wave power supply. In order to eliminate this drawback, it is preferable to use a three-phase dual-wave power supply. Next, the explanation will be given.

FIG. 9 is a torque curve in the case of three-phase single wave energization. The horizontal axis shows the rotation angle of the rotor and the vertical axis shows the output torque. Curves 27a, 27b and 27c show the cases where the armature current is 1 amp, 1.5 amp and 2 amp respectively. The diameter of the rotor is 22 mm, the outer diameter of the fixed armature is 50 mm, and the length is also 5
This is the case of 0 mm. The horizontal axis is shown as the angle of rotation. The ripple torque is about 70%. The concave portion of the torque curve is the point where the end of the salient pole enters the slot. The output torque is small at the left end of the curve 27c, that is, at the point of zero degree. Therefore, when the salient pole is in the above position when the power is turned on, it becomes difficult to start. Although a large output torque can be obtained as described later with reference to FIG. 10, it has the above-mentioned drawbacks. Therefore, by adding a device capable of obtaining the output torque indicated by the dotted curve 33 by three-phase full-wave energization or other means,
The drawbacks mentioned above are eliminated. In order to apply the torque indicated by the dotted line 33 in FIG. 9, the purpose is achieved by additionally attaching a three-phase single-wave electric motor having a salient pole or a slot whose phase is shifted by an odd multiple of 60 degrees with a common rotating shaft.

FIG. 10 is a graph of a torque curve. The horizontal axis is the armature current and the vertical axis is the torque. This electric motor has the structure described above. The curve 43 initially has a square curve, and thereafter has a square curve. In the case of a general electric motor, the magnetic flux is saturated at the point of the dotted line 43a and the output torque becomes equal to or less than the dotted line 43a. Since the torque of the device of the present invention increases linearly thereafter, there is a feature that an output torque about seven times that of other electric motors of the same type can be obtained. Since the starting point of the curve 43 is not a straight line but a curve, it is inconvenient when the output torque is controlled and used in proportion to the energized current. The means for removing this will be described below.

FIG. 5 illustrates the torque generated between the magnetic pole 16a and the salient pole 1a of FIG. In FIG. 5, the magnetic pole 16a is magnetized to be an N pole and the salient pole 1a is magnetized to be an S pole, and magnetic lines of force 25 indicated by arrows are provided between the opposing surfaces 6a and 6b.
Since there are a, 25b and 25c, the salient pole 1a has an arrow 2
It is sucked and rotated in the direction of 9. The direction of the main magnetic flux 25b (the magnetic flux between the facing surfaces of the magnetic poles and the salient poles) is tilted clockwise when the air gap length is large, so that torque is generated, and this torque is a lower power curve below the dotted line 43a in FIG. Becomes The torque on the upper portion becomes a torque due to the leakage magnetic fluxes 25a and 25b and becomes linear. When the gap between the end faces 6a and 6b is set to 1/10 mm or less, the main magnetic flux 25b becomes perpendicular to the end faces and does not contribute to torque. When the air gap is set to 1/10 mm or less, only the torque due to the leakage magnetic fluxes 25a and 25c results in the curve 43b in FIG. 10, and the magnetic resistance of the magnetic circuit also decreases, so that the output torque is increased. That is, there is an effect that the linear torque curve shown by the curve 43b is obtained.

[0021]

EFFECT OF THE INVENTION First Effect The output torque is about 10 times as high as that of the induction motor of the same shape, and a rotation speed of up to about 20,000 revolutions per minute can be obtained if necessary. As compared with the well-known reluctance type electric motor shown in FIG. 1, vibration is reduced and rotation is smooth. Second effect The characteristic is that the relationship between the output torque and the energized current is linearly proportional.

[Brief description of drawings]

FIG. 1 is a sectional view of a fixed armature and a rotor of a conventional reluctance motor.

FIG. 2 is a sectional view of a fixed armature and a rotor of a three-phase reluctance motor according to the present invention.

FIG. 3 is a sectional view of a rotor and a stationary armature of another embodiment of a three-phase reluctance motor according to the present invention.

FIG. 4 is a development view of a rotor, a stationary armature, and an armature coil of another embodiment of a three-phase reluctance type electric motor according to the present invention.

FIG. 5 is an explanatory diagram of rotation torque generation.

FIG. 6 is an electric circuit diagram for obtaining a position detection signal of a three-phase reluctance motor.

FIG. 7 is a graph of torque corresponding to a position detection signal.

FIG. 8: Energization control circuit diagram of three-phase reluctance type motor

FIG. 9 is a graph of a rotation angle and an output torque of a three-phase reluctance electric motor.

FIG. 10 is a graph of current and output torque

FIG. 11: Time chart of position detection signal curve of three-phase reluctance type electric motor

[Explanation of symbols]

1, 1a, 1b, ... Rotor and salient pole 5 Rotating shaft 9 Outer casing 16 Fixed armature 16a, 16b, ... Magnetic pole 17a-1, 17a-2, ..., 9a, 9b, ..., 39
a, 39b, ... Armature coil 17a, 17b, ... Slot 10a, 10b, 10c Position detection coil 10 Oscillator 18, 14a, 14b Block circuit 30a, 30b, 30c, 30d Absolute value circuit 40 Reference voltage terminal 27a, 27b, 27c , 33, 43, 43b Torque curve

Claims (1)

[Claims] 1. A three-phase reluctance type electric motor, comprising n (n is a positive integer of 2 or more) salient poles arranged at an outer peripheral surface of a magnetic rotor with a width and an equal separation angle, and a cylindrical shape. 3n slots arranged at equal intervals on the inner periphery of the stationary armature of the above, and 3n 1st, 2nd, 3rd phase electric machines installed in each of two adjacent slots An auxiliary coil, and a device that supports the salient poles and the inner peripheral surface of the fixed armature in opposition to each other through a gap of 1/10 mm or less,
The rotational position of the salient pole is detected to detect the position detection signal of the first phase separated from each other by an electrical angle of 120 degrees and 240 degrees from each other, and the second phase in which the phase is delayed by 120 electrical degrees. To the position detection device that obtains the position detection signal of the third phase and the position detection signal of the third phase, which is 120 degrees in electrical angle behind them, and the armature coils of the first, second, and third phases. First and second and third semiconductor switching elements connected in series, a DC power source for supplying each of the armature coils and the series connection element of the semiconductor switching elements,
1st, 2nd, 3rd via the position detection signals of
An energization control circuit that conducts the semiconductor switching element connected in series to the armature coil of phase No. 3 for the width of the position detection signal to energize the armature coil, and when the semiconductor switching element is turned off at the end of the position detection signal. At the connection point between the semiconductor switching element and the armature coil, the magnetic energy accumulated by the armature coil is charged into and held by the small-capacity capacitor via the diode, and the energization current of the armature coil is reduced. When the magnetic circuit rotates rapidly by a set angle and the armature coil, which is energized next time, is energized by the width by the position detection signal, the energization is started. At the same time, the electrostatic energy accumulated in the above-mentioned small-capacity capacitor is made to flow into the armature coil to make the rise of the energization current rapid. 3-phase reluctance type motor characterized in that it is more configuration and road.