JPH0662551A - Rotor of reluctance type high-speed motor - Google Patents

Abstract

PURPOSE:To obtain a reluctance type vibration-free motor having a small diameter by making the width of the gap between the internal peripheral surface of a fixed armature and a first salient pole smaller than that of the gap between the internal peripheral surface of the fixed armature and a second salient pole only by a predetermined value, and fixing a balance weight to the second salient pole in such a way that the rotating balance of a rotor is maintained. CONSTITUTION:The center axis of the inner circumferential surface of an armature 16 is aligned to the rotating center line of a rotating shaft 5, and the distance between the outer peripheral surface of a salient pole 1a and the rotating center of the rotating shaft 5 is made larger, by a preset value, than the distance between the outer peripheral surface of a salient pole 1b and the rotating center line of the rotating shaft 5. The salient pole 1a and the salient pole 1b are different from each other in a gap length from the armature 16. A difference in a magnetic attracting force acting on a rotor 1 causes a vector B thereof to act in the direction of the salient pole 1a from the center line of the rotating shaft 5, and this vector rotates in synchronism with the salient pole 1a. This rotation prevents the occurrence of vibration. Since there arises a difference in centrifugal force between the salient pole 1a side and the salient pole 1b side, metal plates 1c are fixed to both side surfaces of the rotor 1 on the salient pole 1b side, so that the metal plates serve as a balance weight.

Description

Detailed Description of the Invention

[Field of Industrial Application] Since a reluctance type electric motor can be miniaturized and increased in speed, it can be used as a driving source for a drill machine. It is also used as a driving source that is small and requires high speed.

[0002]

2. Description of the Related Art A reluctance type electric motor has the advantages that it has a large output torque and that a magnet rotor is not required, but on the other hand, it has many drawbacks, so there are few practical applications. Since miniaturization and high speed have become more difficult technologies, there has been no practical application. Rotational torque can be obtained by the magnetic attraction force between the magnetic poles of the fixed armature and the rotor salient poles, but at this time, the magnetic attraction force in the central direction largely acts, so that mechanical vibration occurs.

[0003]

Reluctance type electric motors have some problems to be solved. The present invention has solved the following two problems to be solved. First Problem According to the general means, the number of salient poles of the rotor is at least four. Therefore, the magnetic energy of the magnetic poles and salient poles goes in and out frequently during one rotation, which deteriorates the efficiency and makes it difficult to increase the speed. Second problem A large magnetic attraction force that does not contribute to the torque in the axial direction is generated between the magnetic pole and the salient pole. To eliminate this, magnetic poles are provided at axially symmetrical positions, but the magnetic attraction force is not erased due to the difference in the air gap length between the magnetic pole and the salient pole,
It has the drawback of generating vibration. Even if the air gap length is adjusted to the same value, the bearing will be worn during use, so there is a problem that there is no means for preventing the vibration from changing due to the change in the air gap length.

[0004]

A cylindrical magnetic rotor made of a silicon steel plate laminate, a rotary shaft fixed to its center line, and a rotary shaft for rotatably supporting the rotary shaft. Made of a ring-shaped silicon steel plate laminate, bearings that support both ends of the rotor, first and second salient poles protruding from the outer surface of the rotor and spaced apart by 90 degrees from each other, A fixed armature in which a two-phase or three-phase armature coil is mounted in a slot on the inner surface thereof, and the above-mentioned first and second via the inner circumferential surface of the fixed armature and a gap of a set width So that the outer circumferential surface of the salient pole rotates and the width of the gap between the inner circumferential surface of the fixed armature and the first salient pole becomes smaller than the width of the gap of the second salient pole by a predetermined value. Means for varying the distance between the outer peripheral surfaces of the first and second salient poles and the rotation axis, and maintaining the rotational balance of the rotor As those that are more configuration and fixed balance weight to the second salient pole side.

[0005]

Since the number of salient poles is two, the number of times magnetic energy enters and exits during one rotation is small, and the iron loss can be reduced in the case of high-speed rotation to prevent the deterioration of efficiency. Further, the electric motor can have a small diameter. Therefore, there is an action for solving the first problem. In FIG. 1, salient pole 1
The gap length between the outer peripheral surface of a and the inner peripheral surface of the fixed armature 16 is set smaller than the gap length between the outer peripheral surface of the magnetic pole 1b and the inner peripheral surface of the fixed armature 16. Therefore, during rotation, the force by which the salient pole 1a is magnetically attracted to the fixed armature is larger than the attractive force by the salient pole 1b. This difference in suction force is indicated by arrow vector B. Since the vector B rotates in synchronization with the rotation of the rotor 1, the rotation axis 5
The bearing rotates while being pressed by the bearing, which has the effect of preventing the occurrence of rotational vibration. The above pressing force is within a range that does not damage the bearing. Due to the above-mentioned means, the centrifugal force of the rotor 1 with respect to the rotating shaft 5 becomes unbalanced and vibration is generated. In order to prevent this, the metal plate 1c is attached to the rotor 1
As shown in the figure, the balance weights are secured to both sides of the balance weight. Therefore, it has a function of preventing vibration.

[0006]

Embodiments of the present invention will be described with reference to FIG. Since the same symbols in the drawings are the same members, duplicate description thereof will be omitted. All subsequent angle displays will be displayed in electrical angles. Next, the configuration of a two-phase full-wave reluctance type motor to which the present invention is applied will be described. FIG. 1 is a plan view of a fixed armature and a rotor. In FIG. 1, reference numeral 1 is a rotor, the salient poles 1a and 1b of which have a width of 180 degrees (mechanical angle of 90 degrees) and are arranged at equal pitches with a phase difference of 360 degrees. The rotor 1 is made by a well-known means in which silicon steel plates are laminated. Symbol 5 is a rotation axis. The fixed armature 16 is provided with eight slots at equal spacing angles, which are designated by symbols 16a, 16b ,. Reference numeral 6 is a cylinder serving as an outer casing. Slot 16
1 for each of a, 16c and slots 16e, 16g
One coil is wound and the two coils are connected in series or in parallel to form a first-phase armature coil. In this embodiment, they are connected in series. One coil is wound around each of the slots 16b and 16d and the slots 16f and 16h, and the two coils are connected in series to form a second-phase armature coil. One coil is wound around each of the slots 16c and 16e and the slots 16g and 16a, and the two coils are connected in series to form a third-phase armature coil. Slots 16d, 16f and slot 16
A coil is wound around each of h and 16b and connected in series to form a fourth-phase armature coil. Generally 2
The phase electric motor is composed of the armature coils of the first and second phases, but if it is considered that each phase is bifilar wound, the first phase becomes a set of two, and the second phase The phase also becomes a pair of two armature coils. These are referred to as first, third and second and fourth phase armature coils. The order of energization is the order of the first phase → the second phase → the third phase → the fourth phase of the armature coil, which is repeated to obtain the output torque.

The arrow A indicates the direction of rotation of the rotor 1, and the salient pole 1
The widths of a and 1b are 90 degrees in mechanical angle, and are separated by the same angle. FIG. 2 is a development view of the rotor 1 and the armature coil. In FIG. 2, armature coils 9a and 9b are the above-described first-phase armature coils, and
c, 9d, armature coils 9e, 9f, and armature coils 9g, 9h represent the above-mentioned second, third, and fourth-phase armature coils, respectively. The lead-out terminals of the armature coils of the first, second, third and fourth phases are symbols 8a, 8b and 8
c, 8d and 8e, 8f and 8g, 8h. The fixed armature 16 is also made of a silicon steel plate laminated body like the rotor 1.

The shaded portions indicated by the dotted lines 1e and 1d are filled with a plastic material for the purpose of preventing friction loss of air during high speed rotation. The above-mentioned armature coils of the first, second, third, and fourth phases are hereinafter referred to as armature coil 32a, armature coil 32b, armature coil 32c, and armature coil 32d, respectively. When the armature coil 32c is energized, the salient poles 1a and 1b are attracted and the rotor 1 rotates in the direction of arrow A. When rotated by 90 degrees, the armature coil 32c is de-energized and the armature coil 32d is energized. When the armature coil 32d further rotates by 90 degrees, the energization of the armature coil 32d is cut off and the armature coil 32a is energized. The energization mode is such that the armature coil 32a → armature coil 32b → armature coil 32c → every 90 degrees rotation.
It is cyclically replaced with the armature coil 32d and driven as a two-phase full-wave electric motor. At this time, the magnetic poles at the axially symmetrical positions are magnetized to the N and S poles. Since the two excited magnetic poles are always of different polarities, the leakage magnetic fluxes passing through the non-excited magnetic poles are in opposite directions to each other, thus preventing generation of anti-torque.

The coils 10a and 10b are salient poles 1a and 1b.
Of the salient poles 1a, 1b, which is fixed to the armature 16 side at the position shown in the figure by a position detecting element for detecting the position of
It faces the side surface of the through gap. Coils 10a, 1
0b are separated by 90 degrees. The coil is an air-core coil having a diameter of 5 millimeters and having about 100 turns. FIG. 3 shows a device for obtaining a position detection signal from the coils 10a and 10b. In FIG. 3, the coil 10a and the resistor 15
a, 15b, 15c become a bridge circuit, and the coil 10
It is adjusted so as to be in equilibrium when it does not face a or the salient poles 1a and 1b. Therefore, the outputs of the low-pass filter composed of the diode 11a, the capacitor 12a and the diode 11b, the capacitor 12b are equal, and the output of the operational amplifier 13 is at a low level. Reference numeral 10 is an oscillator, which oscillates about 1 megacycle. When the coil 10a faces the salient poles 1a, 1b, ..., Impedance decreases due to iron loss (eddy current loss and hysteresis loss), the voltage drop of the resistor 15a increases, and the output of the operational amplifier 13 becomes high level.

The input of the block circuit 18 is the time chart curves 33a, 33b, ... Of FIG.
The input through 3a becomes curves 35a, 35b, ... Inverting the curves 33a, 33b ,. The block circuit 14 of FIG. 3 has the same configuration as the above-described circuit including the coil 10b. The oscillator 10 can be commonly used. Output of block circuit 14 and inversion circuit 13b
7 are input to the block circuit 18, and their output signals are the curves 34a, 34b, ... And the curves 36a, 36 obtained by inverting the curves 34a, 34b ,.
b, ... The curves 34a, 34b, ... Are the curves 33a,
The phase is 90 degrees behind 33b. Curve 33
The output of the AND circuit having two inputs of a, 33b, ... And curves 36a, 36b, .. becomes curves 37a, 37b, .., and curves 33a, 33b, ... And curves 34a, 34b ,.
The output of the AND circuit with two inputs is the curves 38a, 3
8b, ... By the same means, the curves 39a, 39b,
... and curves 40a, 40b, ... are obtained. The circuit described above is shown as block circuit 18 and includes terminals 18a, 18
The outputs of b, ... Are signals shown by the curves 37a, 37b ,. Coils 10a, 10b
The same purpose can be achieved by using aluminum plates of the same shape instead of the opposing rotors 1 of FIG.

The energizing means of the armature coil will be described below with reference to FIG. Armature coils 32a, 32b, 32c, 32
At the lower end of d, transistors 20a, 20b,
20c and 20d are inserted. Transistor 20
Reference characters a, 20b, 20c and 20d serve as 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.
In this embodiment, the transistors 20a, 20b, 20c,
Since 20d is on the lower end of the armature coil, that is, on the side of the negative electrode of the power supply, the input circuit for conduction control thereof is characterized by being simplified.

Next, details will be described with reference to FIG. Terminal 42
The position detection signal curves 37a, 37b, ..., Curves 38a, 38b, ..., Curves 39a, 39b, ..., Curves 40a, 40b, ... Of FIG. 7 are input from a, 42b, 42c, 42d. With the input signal described above, the transistor 20
a, 20b, 20c, 20d are AND circuits 24a, 24
A base input is obtained via b, 24c, and 24d and is conducted, and the armature coils 32a, 32b, 32c, and 32d are energized. Terminal 43 is a reference voltage for designating the armature current. The output torque can be changed by changing the voltage of the terminal 43. When a power switch (not shown) is turned on, the input of the + terminal of the operational amplifier 43a is lower than that of the-terminal, so the output of the operational amplifier 43a becomes low level, and the input of the inverting circuit 28b is also low level, so its output is high level. And transistor 2
0a conducts, and a voltage is applied to the armature coil energization control circuit. The resistor 22a includes armature coils 32a and 32a.
These are resistors for detecting armature currents of b, 32c, and 32d. The block circuits F, G, H include the armature coil 32.
The circuit for controlling the energization of b, 32c, and 32d has the same configuration as the circuit of the armature coil 32a. The diodes 49b, 49c, 49d are members corresponding to the diode 49a.

One of the position detection signal curves of FIG. 7 is shown as a curve 33a at the first stage of the time chart of FIG. According to conventional means, the armature coil is energized by the width of the curve 33a. The arrow 23 in FIG. 6 indicates a conduction angle of 180 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 is discharged back into the power source,
It descends like the latter half 25a of the curve 25 on the right side of the dotted line J. The section in which the positive torque is generated is 180 indicated by arrow 23.
Since it is the degree section, the counter torque is generated in the section indicated by the arrow 23a, which reduces the output torque and the efficiency. At high speeds, this phenomenon becomes extremely large and unusable.

At a high speed, the width of the curve 33a becomes smaller, so that the curve 25 is delayed and the output torque decreases. 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. The device of the present invention is
Backflow prevention diodes 49a, 49b, ..., And a small capacity capacitor 41a and diodes 21a, 21 of FIG.
d and the semiconductor elements 4a, 4b, 5a, etc. are attached to eliminate the above-mentioned drawbacks, and only one switching element (symbols 20a, 20b, 20c, 20d) for controlling energization of the armature coil is provided on the negative voltage side of the power supply. It is characterized by being used. In the present embodiment, the position detection signals input to the terminals 42a, 42b, ... Are 90 ° wide and have curves 37a, 3 in FIG.
7b, ..., Curves 38a, 38b, ..., Curves 39a, 39
b, ..., Curves 40a, 40b ,. Terminal 4
When the power is cut off at the end of the input signal curve 37a of 2a,
The magnetic energy accumulated in the armature coil 32a charges the capacitor 41a to the polarity shown in the figure via the diode 21a, and makes it a high voltage. Therefore, the magnetic energy disappears rapidly and the current drops rapidly.

The first stage curve 26 of the time chart of FIG.
Reference numerals a, 26c, and 26b are current curves that flow through the armature coil 32a, and the dotted lines 26-1 and 26-2 on both sides of the curve are 90 degrees. The energizing current rapidly drops as shown by the curve 26b to prevent the generation of counter torque, and the capacitor 41a is charged to a high voltage and held. Next, when the position detection signal curve 37b of FIG. 7 is input to the terminal 42a, the transistor 20a becomes conductive and the armature coil 32a is energized. Since the block circuit 4 is composed of a monostable circuit which is energized by the differential pulse at the beginning of the curve 37b, the electrical pulse at the beginning of the input at the terminal 42a causes the transistors 4a, 4b and SCR5a to conduct and the capacitor 41a
Is applied to the armature coil 32a to speed up the rise of energization. This rising curve is shown as curve 26a in FIG. The above-described discharge current of the capacitor 41a is prevented from flowing back to the DC power source side by the backflow prevention diode 49a. The diode 21d serves as a discharging circuit for the capacitor 41a.

When the armature coil 32a is energized,
Charging voltage and power supply voltage of the capacitor 41a (terminals 2a, 2
Both the voltage (b) and the applied voltage become applied voltages, so that the current of the armature coil 32a rises rapidly. Due to this phenomenon,
It rises rapidly like the curve 26a in FIG. The rising energization curve 26a becomes slower to rise as shown in the figure in the middle.
This is because when the magnetic energy moves between the armature coils, it is converted into heat energy by the copper loss of the coils and the iron loss of the magnetic poles and disappears. Means for removing such inconvenience will be described later. 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. Block circuit F, G, H
Is an energization control circuit for the armature coils 32b, 32c, 32d, which has the same configuration as the armature coil 32a described above, and has the same operational effect. Armature coils 32b, 32
c and 32d are curves 38a, 38b, ... And curve 3 in FIG. 7 which are input position detection signals of the terminals 42b, 42c and 42d.
The energization is controlled by the curves 9a, 39b, ... And the curves 40a, 40b ,.

Next, the chopper circuit will be described. When the current of the armature coil 32a increases and the voltage drop of the resistor 22a for detecting the armature coil 32a increases and exceeds the voltage of the reference voltage terminal 43 (the input voltage of the negative terminal of the operational amplifier 43a),
Since the output of the operational amplifier 43a is converted to the high level,
The differential pulse is obtained from the differential circuit 43b, and the monostable circuit 2
By energizing 8a, a pulse electric signal having a predetermined width is obtained.
Since the output of the inverting circuit 28b is converted to the low level by that width, the output of the AND circuit 24a also becomes the low level by the same width, and the transistor 20a is also converted to the non-conduction by that width. Therefore, the current in the armature coil (armature current) drops and charges the capacitor 41a via the diode 21a. When the output signal of the monostable circuit 28a disappears, the outputs of the inverting circuit 28b and the AND circuit 24a are converted to the high level again, the transistor 20a becomes conductive, and the armature current starts to increase. When the armature current exceeds the set value, the output of the operational amplifier 43a is converted to the high level again, the transistor 20a is converted to the non-conductive state by the output pulse width of the monostable circuit 28a, and the armature current drops. The chopper circuit repeats such a cycle, and the armature current has a current value regulated by the voltage of the reference voltage terminal 43. The curve 26c in FIG. 6 shows the current under chopper control. The constant speed control can also be performed by a known means for controlling the voltage of the reference voltage terminal 43 with a voltage proportional to the rotation speed.

When there is the above-mentioned chopper action, the capacitor 41a is provided as many times as the number of output pulses of the monostable circuit 28a.
Is repeatedly charged, the voltage rises, and electrostatic energy is accumulated. At the end of the position detection signal, the transistor 20a
Is turned off, all the magnetic energy of the armature coil 32a is charged in the capacitor 41a. The electrostatic energy corresponding to the chopper frequency and the fall time of the armature current is further added to the electrostatic energy of the capacitor 41a. Due to such electrostatic energy, a current rises when the armature coil 32a is next energized, so that the above-mentioned energy loss due to copper loss of the armature coil and iron loss of the magnetic poles can be compensated. Therefore, the armature current rises rapidly as shown by the dotted curve 27a in the first stage of FIG. 6 and becomes almost a rectangular wave, which has the effect of increasing the output torque. It is necessary to adjust the capacitance of the capacitor 41a, the frequency of the chopper current, and the output pulse width of the monostable circuit 28a so as to have the above-mentioned effects. Armature coils 32b, 32
In c and 32d, the chopper control of the armature current is similarly performed by the AND circuits 24b, 24c and 24d transistors 20b, 20c and 20d.

The armature coil may be energized at any point up to 45 degrees from the point where the salient pole enters the magnetic pole.
Adjustment is performed in consideration of the rotation speed, efficiency, and output torque, and the positions of the coils 10a and 10b 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 a high speed rotation can be performed efficiently, so that the object of the present invention is achieved. Curves 27a, 26b, and 26c in the first stage of FIG. 6 represent the energization curves of the armature coils, and the distance between the dotted lines 26-1 and 26-2 is 9 in the position detection signal.
It is 0 degrees wide. Curves 9a, 9b and 9c are output torque curves. The curve 9a is flat when the current in the armature coil is small, but the torque is flat, but the torque peak value moves to the left as shown by the curves 9b and 9c, and the width of the peak value also narrows. . The fixed position of the position detection coils 10a, 10b is adjusted so that the point at which the energization is started is at a point about 30 degrees apart from the point at which the salient pole enters the magnetic pole in consideration of the torque characteristics and the energized current value described above. Good to do. Since the charging voltage of the capacitor 41a is higher when the capacity is smaller, the rising and falling of the energization curve can be made rapid, and a high-speed rotating electric motor can be obtained, which is a low speed which is a drawback of the reluctance type electric motor. The defects can be eliminated. It is preferable to use a capacitor having a small capacity as long as the charging voltage does not damage the transistor of the circuit. The same purpose can be achieved by removing the capacitor 41a and providing the capacitor 47a as shown by the dotted line. In this case, the output side of the diode 21d is connected to the upper end of the armature coil 32a.

Next, FIG. 5 will be described. Armature coil 3
Transistors 20a and 22a and transistors 20c and 22c are connected to both ends of 2a and 32c. When the energization of the armature coils 32a, 32c is cut off, the accumulated magnetic energy of those is removed by the diodes 21a, 21b, 21c, 2
The capacitor 47a is charged via 1d to a high voltage with the polarity shown. Therefore, the energization current drops rapidly. Transistor 20a, 22a or transistor 20
Either c or 22c receives the input position detection signal of the terminals 42a and 42c (curves 37a, 37b, ... And curve 39 in FIG. 7).
a, 39b, ...)
Is applied to either of the armature coils 32a and 32c to make the rise of energization rapid. The block circuit K is a circuit for controlling energization of the armature coils 32b and 32d, and is a circuit similar to the control circuit of the armature coils 32a and 32c. As will be understood from the above description, the object of the present invention is achieved. AND circuits 24a, 24b,
..., 24d, resistor 22a, symbols 43, 43a, 43b,
The members indicated by 28a and 28b have the same operation and effect as the members denoted by the same symbols in FIG. It is also possible to remove the transistors 22a and 22c of this embodiment and implement the present invention by the means of FIG.

Although the above-mentioned embodiment is the case of the electric motor of the two-phase double-wave power supply, the means of the present invention can be implemented also in the case of the three-phase single-wave power supply. In this case, the rotor 1 has the same configuration, but the number of slots of the armature 16 is 12. Next, details of the rotor 1 which is the gist of the present invention will be described with reference to FIG. During rotation, the salient poles 1a and 1b are magnetized by the energization of the armature coil, so that the salient poles 1a and 1b move in the direction of the rotation center axis (center line of the rotation axis 5) (direction of arrow B).
The a and 1b receive a suction force. The attraction forces of the salient poles 1a and 1b are different from each other for the reason described below, and thus generate vibration during rotation. Vibration is generated by the air gap existing between the rotating shaft 5 and the bearing. Further, when the gap lengths of the outer peripheral surfaces of the salient poles 1a and 1b and the inner peripheral surface of the armature 16 change during rotation, vibration similarly occurs.

The device of the present invention eliminates the above-mentioned vibration by the following configuration. The gap length between the outer peripheral surface of the salient pole 1a and the inner peripheral surface of the armature 16 is set smaller than the gap length between the outer peripheral surface of the salient pole 1b and the inner peripheral surface of the armature 16 by a set value. As this means, the center axis of the inner peripheral surface of the armature 16 is made to coincide with the rotation center line of the rotating shaft 5, and the distance between the outer peripheral surface of the salient pole 1a and the rotating center line of the rotating shaft 5 is set to the outer circumference of the salient pole 1b. It is set larger than the distance between the surface and the center line of rotation of the rotary shaft 5. With the above configuration, the magnetic attraction force acting on the rotor 1 in the direction of the arrow B is increased by a predetermined value, and the vector B of the magnetic attraction force rotates in synchronization with the salient pole 1a, so that the occurrence of vibration is prevented. .

Due to the configuration of the rotor 1 described above, a difference occurs in centrifugal force between the salient pole 1a and the salient pole 1b during rotation to generate vibration. In order to remove this, the metal plate 1c is fixed to the side surface of the rotor 1 on the salient pole 1b side to form a balance weight, so that the vibration is removed. The metal plates 1c having the same shape are fixed to both side surfaces of the rotor 1. With the above configuration, there is an effect that it is possible to prevent the occurrence of vibration even during high speed rotation.

[0024]

EFFECT OF THE INVENTION First Effect Since the number of salient poles is two, an electric motor having a small diameter can be obtained. Further, iron loss at high speed rotation can be reduced. Second effect It is possible to prevent the occurrence of vibration in the case of high speed rotation.

[0025]

[Brief description of drawings]

FIG. 1 is a plan view of a two-phase full-wave reluctance type electric motor according to the present invention.

FIG. 2 is a development view of a fixed armature and a rotor of the electric motor shown in FIG.

FIG. 3 is an electric circuit diagram of the position detection device.

FIG. 4 is an energization control circuit diagram of an armature coil of the device of the present invention.

FIG. 5 is another embodiment of the energization control circuit diagram of the armature coil of the device of the present invention.

FIG. 6 is a graph of armature current

FIG. 7: Time chart of position detection signal

[0026]

[Explanation of symbols]

1, 1a, 1b ... Rotor and salient pole 5 Rotating shaft 16, ... Armature 9a, 9b, ..., 6a, 6b, ... Armature coil 6 Outer casing 10a, 10b Position detection coil 32a, 32b, ..., 32d Electric machine Child coil F, G, H, K Block circuit for controlling energization of armature coil 4,18 Block circuit 43 Reference voltage terminal 43b Differentiation circuit 28a Monostable circuit 9a, 9b, 9c ... Torque curve 25, 25a, 26a, 26b , 26c, 27a, ... Armature coil energization curve 10 Oscillators 16a, 16b, ... Slot 1c Balance weight

Claims (1)

[Claims] 1. A cylindrical magnetic rotor made of a laminated body of silicon steel plates, a rotary shaft fixed to its center line, and both ends of the rotary shaft supported so as to rotatably support the rotary shaft. Bearings, the first and second salient poles protruding from the outer rotation surface of the rotor and separated from each other by a width of 90 degrees, and an annular silicon steel plate laminated body. A fixed armature in which a two-phase or three-phase armature coil is mounted in a slot, and an inner circumferential surface of the fixed armature and a gap of a set width are provided between the first and second salient poles. As the outer circumferential surface rotates, the width of the air gap between the inner circumferential surface of the fixed armature and the first salient pole becomes smaller than the width of the air gap of the second salient pole by a predetermined value. 2 means for varying the distance between the outer peripheral surface of the salient pole and the rotation axis, and the second projection so as to maintain the rotational balance of the rotor. The rotor of the reluctance type high-speed electric motor, characterized in that it is more structure and balance weight fixed to the side. [0001]