JP2010183652A - Variable characteristic electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric motor that eliminates disadvantages in layout by improving motor torque when the characteristics of the electric motor change. <P>SOLUTION: When suppression of an induction voltage is not required due to the shift from high-speed rotation to low-speed rotation, auxiliary magnet rows 11, 12 are raised to the position (a). An auxiliary magnetic flux β1 decreases a magnetic resistance, and changes its direction to release the magnetic saturation. An auxiliary magnetic flux β2 changes its direction to be along the direction of the field magnetic flux α. The auxiliary magnetic flux β2 enhances the magnetic flux α to increase the output of the electric motor. Accordingly, in low-speed rotation, the magnetic resistance is low and the electric motor operates with a highly efficient and large output, and there is no disadvantage in layout. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention comprises an armature composed of an armature core and an armature winding wound around the armature core, and a field element formed by alternately providing permanent magnets having different polarities on a field core. The present invention relates to an electric motor such as a rotary motor or a linear motor driven by a field magnetic flux formed in a closed circuit between magnets, and more particularly to a variable characteristic electric motor having variable operating characteristics.

As this type of variable characteristic motor, there has been conventionally known a motor described in Patent Document 1, for example.
This variable characteristic motor reduces the field magnetic flux by short-circuiting the magnetic path with the magnetic material plate at high speed rotation in order to reduce the induced voltage that becomes noticeable at high speed rotation. The induced voltage can be suppressed.

JP 2001-314053 A

  However, the magnetic material plate for performing the magnetic short circuit described above is disadvantageous in terms of layout because it only reduces the field magnetic flux as described above and does not contribute to an increase in motor torque. It was.

The present invention proposes a variable characteristic motor that can improve the motor torque when changing the characteristics of the motor,
Accordingly, an object of the present invention is to eliminate the disadvantages related to the conventional layout.

For this purpose, the variable characteristic motor according to the invention is as described in claim 1,
An armature composed of an armature core and an armature winding wound around the armature core, and a field element formed by alternately providing permanent magnets having different polarities on the field core, and between these armature and the field element In an electric motor driven by a field magnetic flux formed in a closed loop shape,
Provided with an auxiliary magnet that generates at least two closed auxiliary magnetic fluxes in cooperation with the armature and the field element,
Of these auxiliary magnetic fluxes, one auxiliary magnetic flux reduces the magnetic resistance and relaxes magnetic saturation, and the other auxiliary magnetic flux is in a forward direction with respect to the field magnetic flux, The auxiliary magnet can displace the auxiliary magnet between the second state in which the auxiliary magnetic flux increases the magnetic resistance to facilitate magnetic saturation and the other auxiliary magnetic flux is in a direction opposite to the field magnetic flux. It is characterized by having comprised as follows.

According to the variable characteristic motor of the present invention,
When the auxiliary magnet is changed from the second state to the first state for the purpose of changing the characteristics, there is no need to suppress the induced voltage in the transition from high speed driving to low speed driving.
By switching the other auxiliary magnetic flux from the reverse direction to the forward direction with respect to the field magnetic flux, the field magnetic flux is increased by the auxiliary magnetic flux,
The increase in the field magnetic flux can increase the output of the electric motor, and the electric motor is not disadvantageous in terms of layout, and the problems of the conventional electric motor described above can be solved.

1 is a perspective view showing a variable characteristic motor according to a first embodiment of the present invention. The state at the time of low rotation of the variable characteristic electric motor which becomes the same Example is shown, (a) is a top view which removes the armature, (b) is the vertical front view. The state at the time of high rotation of the variable characteristic electric motor which becomes the same Example is shown, (a) is a top view which removes the armature, (b) is the vertical front view. It is explanatory drawing of the magnetic flux at the time of the low rotation of the variable characteristic electric motor which becomes the Example. It is explanatory drawing of the magnetic flux at the time of the high rotation of the variable characteristic electric motor which becomes the Example. FIG. 5 is a longitudinal sectional front view showing a modified example related to the arrangement state of the main magnet row and the auxiliary magnet row in the variable characteristic electric motor of FIGS. It is a characteristic diagram which shows the relationship between the arrangement state of a main magnet row | line | column and an auxiliary magnet row | line | column, and the magnitude | size of the field magnetic flux obtained by it. FIG. 6 is a longitudinal front view of a variable characteristic motor according to a second embodiment of the present invention. FIG. 6 is a longitudinal front view of a variable characteristic motor according to a third embodiment of the present invention configured as a rotary motor. FIG. 9 is a longitudinal sectional side view of a main part of a variable characteristic motor according to a fourth embodiment of the present invention configured as a rotary motor. It is a principal part perspective view of the variable characteristic electric motor which becomes the Example. FIG. 10 is a perspective view of a main part of a variable characteristic motor according to a fifth embodiment of the present invention configured as a rotary motor. FIG. 10 is a perspective view of a main part of a variable characteristic motor according to a sixth embodiment of the present invention configured as a rotary motor. FIG. 7 shows a variable characteristic motor according to a seventh embodiment of the present invention, wherein (a) is a longitudinal front view showing a state at the time of low rotation, and (b) is a longitudinal front view showing a state at the time of high rotation. . FIGS. 14A and 14B show a modification of the variable characteristic electric motor shown in FIG. 14. FIG. 14A is a longitudinal front view showing the state at a low rotation, and FIG. 14B is a longitudinal front view showing the state at a high rotation.

Hereinafter, embodiments of the present invention will be described in detail based on the illustrated examples.
<Configuration of the first embodiment>
FIG. 1 is a perspective view of a variable characteristic motor according to a first embodiment of the present invention that can be configured as a linear motor or a rotating electric machine. FIGS. 2 and 3 are respectively a state of the variable characteristic motor of FIG. The state at the time of high rotation is shown.
As shown in FIG. 1, the variable characteristic motor of this embodiment is composed of a fixed armature 1 and a movable field element 2.

The armature 1 is formed by arranging the U-shaped armature cores 3 shown in FIGS. 2 (b) and 3 (b) in the direction of driving the motor as shown in FIG. The winding 4 is wound around.
The field element 2 includes a pair of permanent magnet rows 5 and 6, and the permanent magnet rows 5 and 6 are respectively arranged as shown in FIGS. 2 (a) and 3 (a). , 6a and S pole main magnets 5b, 6b.
In this alternate arrangement, the N-pole main magnet 5a and the S-pole main magnet 6b face each other, and the S-pole main magnet 5b and the N-pole main magnet 6a face each other.

The alternate arrangement direction of the main magnets 5a and 5b and the alternate arrangement direction of the main magnets 6a and 6b are the same as the arrangement direction of the U-shaped armature cores 3, respectively.
As shown in FIGS. 2 (b) and 3 (b), the permanent magnet row 5 in which the main magnets 5a and 5b are alternately arranged has a predetermined air gap in one leg row of the U-shaped armature core 3. Hold it oppositely and attach it to the field core 7.
Similarly, as shown in FIG. 2 (b) and FIG. 3 (b), the permanent magnet row 6 in which the main magnets 6a and 6b are alternately arranged has a predetermined length on the other leg row of the U-shaped armature core 3. The air gaps are arranged opposite to each other and attached to the field core 8.

As shown in FIGS. 2 (a) and 2 (b) and FIGS. 3 (a) and 3 (b), the auxiliary magnet rows 11 and 12 are provided in the gap formed between the permanent magnet rows 5 and 6 by the above arrangement. .
As shown in FIGS. 2 (a) and 3 (a), the auxiliary magnet row 11 is constituted by an alternating arrangement of N-pole permanent magnets 11a and S-pole permanent magnets 11b.
Similarly, as shown in FIGS. 2 (a) and 3 (a), the auxiliary magnet row 12 is also composed of an alternating arrangement of N-pole permanent magnets 12a and S-pole permanent magnets 12b.

The auxiliary magnets 11a, 11b, 12a, and 12b are arranged in the same direction as the main magnets 11a, 11b, 12a, and 12b, respectively, and are attached to the common iron core rod 13.
This iron rod 13 is capable of stroke relative to the permanent magnet rows 5 and 6 in the gap between the permanent magnet rows 5 and 6 with the auxiliary magnet rows 11 and 12,
Position switching (state change) between the first position (first state) for low rotation shown in FIG. 2 (a) and the second position (second state) for high rotation shown in FIG. 3 (a) Shall be.

In the first position (first state) for low rotation shown in FIG. 2 (a), the N pole auxiliary magnets 11a and 12a face the N pole main magnets 5a and 6a, and the S pole auxiliary magnets. 11b and 12b are opposite to the S pole main magnets 5b and 6b,
In the second position (second state) for high rotation shown in FIG. 3 (a), the N-pole auxiliary magnets 11a, 12a face the S-pole main magnets 5b, 6b, and the S-pole auxiliary magnets 11b, It is assumed that 12b faces the N-pole main magnets 5a and 6a.

<Operation of the first embodiment>
The operation of the variable characteristic motor according to the first embodiment will be described below.
In this embodiment, the energization of the winding 3 of the armature 1 causes a closed circuit between the armature 1 and the field element 2 as shown in FIG. 2 (b), FIG. 3 (b) and FIGS. A field magnetic flux α is generated, which drives the field element 2.

By the way, at high speed, the induced voltage increases and the efficiency of the motor decreases, so it is necessary to operate the motor with the characteristic that the induced voltage is reduced.
On the other hand, since the induced voltage does not increase at low speed, it is not necessary to reduce the induced voltage, and it is preferable to operate the motor with a small magnetic resistance.

Therefore, at the time of low rotation, the auxiliary magnet rows 11 and 12 are set to the first position (first state) for low rotation shown in FIG. 2 (a), and the N pole auxiliary magnets 11a and 12a are set to the N pole main magnets 5a, The S-pole auxiliary magnets 11b and 12b are opposed to the S-pole main magnets 5b and 6b.
As a result, the auxiliary magnet arrays 11 and 12 generate two closed auxiliary magnetic fluxes β1 and β2 as shown in FIGS. 2B and 4 due to the cooperation with the armature 1 and the field element 2.

Of these auxiliary magnetic fluxes β1 and β2, one auxiliary magnetic flux β1 lowers the magnetic resistance and relaxes magnetic saturation, and the other auxiliary magnetic flux β2 is the above-mentioned field magnetic flux as shown in FIG. 2 (b) and FIG. As shown in FIG. 4, the field magnetic flux α can be increased to increase the output of the electric motor.
As described above, at low speeds, the motor can be operated with a large output with low magnetic resistance and high efficiency, and the motor does not have a layout disadvantage, eliminating the problems of the conventional motors described above. can do.

At the time of high rotation, the auxiliary magnet rows 11 and 12 are set to the second position (second state) for high rotation shown in FIG. 3 (a), and the N-pole auxiliary magnets 11a and 12a are changed to the S-pole main magnets 5b and 6b. The S-pole auxiliary magnets 11b and 12b are opposed to the N-pole main magnets 5a and 6a.
As a result, the auxiliary magnet arrays 11 and 12 generate two closed auxiliary magnetic fluxes β3 and β4 as shown in FIGS. 3B and 5 by the cooperation of the armature 1 and the field element 2.

Of these auxiliary magnetic fluxes β3 and β4, one auxiliary magnetic flux β3 increases the magnetic resistance to facilitate magnetic saturation, and the other auxiliary magnetic flux β4 has a direction opposite to the field magnetic flux α as shown in FIG. Thus, the field magnetic flux α can be weakened and the output of the motor can be reduced.
As described above, the motor is operated with a low output characteristic with a large magnetic resistance at the time of high rotation, and the induced voltage that increases at the time of the high rotation can be suppressed to prevent the efficiency of the motor from being lowered.

<Modification of field element>
Here, a modification of the field element 2 in the variable characteristic motor described above will be described in detail below with reference to FIG.
The arrangement of the main magnet arrays 5 and 6 with respect to the field cores 7 and 8 is a type in which the main magnet arrays 5 and 6 are embedded in the field cores 7 and 8 so as not to be exposed from the field cores 7 and 8. Embedded placement,
The arrangement of the auxiliary magnet arrays 11 and 12 with respect to the iron core rod 13 is a surface arrangement that attaches to the iron core rod 13 so that the auxiliary magnet arrays 11 and 12 are exposed from the iron core rod 13.

Thus, the reason why the main magnet arrays 5 and 6 are embedded in the field element cores 7 and 8 and the auxiliary magnet arrays 11 and 12 are disposed on the core rod 13 is as follows.
In FIG. 7, A1 has the main magnet arrays 5 and 6 placed on the surface of the field cores 7 and 8 as shown in the figure directly below, and the auxiliary magnet arrays 11 and 12 are not provided (at low rotation and high speed). The magnitude Ψ of the field magnetic flux in the case where the characteristics are not variable at the time of rotation.

  B1 and B2 respectively have the main magnet arrays 5 and 6 arranged on the surface of the field cores 7 and 8 as shown directly below the figure, and the auxiliary magnet arrays 11 and 12 are also cores as shown directly below the figure. In the case where the surface of the rod 13 is arranged, the magnitude Ψ of the field magnetic flux when the rotation is low and the magnitude Ψ of the field magnetic flux when the rotation is high are shown.

  Further, B3 and B4 are respectively embedded with the main magnet rows 5 and 6 embedded in the field cores 7 and 8 as shown directly below the figure, and the auxiliary magnet rows 11 and 12 are also cores as shown directly below the figure. In the case where the rod 13 is embedded in the rod 13, the magnitude Ψ of the field magnetic flux when the rotation is low and the magnitude Ψ of the field magnetic flux when the rotation is high are shown.

  B5 and B6 are respectively arranged such that the main magnet arrays 5 and 6 are embedded in the field cores 7 and 8 as shown in the figure, and the auxiliary magnet arrays 11 and 12 are arranged in the core as shown in the figure. In the case where the surface of the rod 13 is arranged, the magnitude Ψ of the field magnetic flux when the rotation is low and the magnitude Ψ of the field magnetic flux when the rotation is high are shown.

  As is clear from the comparison between B1 and B6, according to the combination of the embedded arrangement of the main magnet arrays 5 and 6 and the surface arrangement of the auxiliary magnet arrays 11 and 12, which can obtain the performance of B5 and B6, the performance of A1 The field magnetic flux increase allowance is the largest, and the characteristic change allowance between the low rotation speed and the high rotation speed is also maximized, so that the above-described effects can be exhibited most remarkably.

From this point of view, in the first embodiment, as described above with reference to FIG. 6, the arrangement of the main magnet arrays 5 and 6 with respect to the field cores 7 and 8 is such that the main magnet arrays 5 and 6 are separated from the field cores 7 and 8. The embedded arrangement of the type embedded in the field cores 7 and 8 so as not to be exposed,
The arrangement of the auxiliary magnet arrays 11 and 12 with respect to the iron core rod 13 is preferably a surface arrangement that attaches to the iron core rod 13 so that the auxiliary magnet arrays 11 and 12 are exposed from the iron core rod 13.

<Second embodiment>
FIG. 8 shows a second embodiment of the present invention. In this embodiment, a part of the auxiliary magnets 11 and 12 is locked by a bowl-shaped beam by the iron core of the field element 2.
Such partial locking of the auxiliary magnets 11 and 12 can prevent the auxiliary magnets 11 and 12 from scattering.

<Third embodiment>
FIG. 9 shows a variable characteristic motor according to a third embodiment of the present invention. In this embodiment, the variable characteristic motor is configured as a variable characteristic rotating electric machine.
Therefore, the armature 1 is configured as a cylindrical stator, the field element 2 is configured as a circular rotor, and the circular rotor (field element) 2 is concentrically disposed in the cylindrical stator (armature) 1. The cylindrical stator (armature) 1 is rotatably supported.
In this case, the magnetic path by the main magnet arrays 5 and 6 is formed in a plane perpendicular to the rotation axis.

<Fourth embodiment>
FIGS. 10 and 11 show a variable characteristic motor according to a fourth embodiment of the present invention. In this embodiment, the variable characteristic motor is configured as a variable characteristic rotating electric machine.
However, the armature 1 is configured as a cylindrical stator in which the armature cores 3 are arranged in the circumferential direction as clearly shown in FIG. 11 and the armature windings 4 are wound around the armature cores 3.

The field element 2 is configured as a circular rotor as shown in FIG. 11, but as shown in FIG. 10, the main magnet rows 5 and 6 are juxtaposed in the axial direction, and the auxiliary magnet row 11 is interposed between the main magnet rows 5 and 6. , 12 are arranged so as to be capable of relative displacement in the circumferential direction.
As shown in FIG. 10, the circular rotor (field element) 2 is disposed concentrically in a cylindrical stator (armature) 1 and is rotatably supported in the cylindrical stator (armature) 1.
In this case, the magnetic path by the main magnet arrays 5 and 6 is formed in a plane including the rotation axis.

<Fifth embodiment>
FIG. 12 shows a variable characteristic motor according to a fifth embodiment of the present invention. In this embodiment, the configuration is basically the same as that of the fourth embodiment of FIGS.
A gap 21 between the permanent magnets 5a and 5b forming the main magnet arrays 5 and 6 of the field element 2 and between the permanent magnets 5a and 6b (only the permanent magnets 6a and 6b are visible in FIG. 12) for blocking the magnetic path Set.
A nonmagnetic member may be provided in the gap 21.

  According to the configuration of the present embodiment, magnetic flux leakage can be reduced by reducing magnetic flux leakage between the permanent magnets 5a and 5b and between the magnetic magnets 6a and 6b.

<Sixth embodiment>
FIG. 13 shows a variable characteristic motor according to a sixth embodiment of the present invention. In this embodiment, the configuration is basically the same as that of the fifth embodiment of FIG.
As described above, the auxiliary magnet rows 11 and 12 are interposed between the main magnet rows 5 and 6 so as to be relatively displaceable in the circumferential direction, and the positions of the auxiliary magnet rows 11 and 12 are switched between a low rotation time and a high rotation time. The same effect as the embodiment is obtained.

<Seventh embodiment>
FIG. 14 shows a variable characteristic motor according to a seventh embodiment of the present invention, and in this embodiment, the configuration is basically the same as that of the first embodiment of FIGS.
The auxiliary magnet row provided between the main magnet rows 5 and 6 of the field element 2 is constituted by the electromagnet 31 instead of the permanent magnet rows 11 and 12 as in the first embodiment.

According to such a configuration, the direction of the current flowing through the electromagnet 31 is reversed between the first state and the second state at the time of low rotation in FIG. 14 (a) and at the time of high rotation in FIG. 14 (b). The state can be changed, and the same characteristic changing action as described above can be obtained.
Therefore, it is not necessary to displace the electromagnet 31, and it can be integrated with the main magnet arrays 5 and 6, and the configuration can be simplified.

In this case, the center of the electromagnet 31 is preferably a cavity 32 as shown in FIG.
According to the air electromagnet 31, the above characteristic changing action obtained by reversing the direction of the current flowing through the electromagnet 31 at the time of low rotation in FIG. 15 (a) and at the time of high rotation in FIG. It can be done with certainty.

1 Armature
2 field element
3 Armature core
4 Armature winding
5,6 Main magnet row
5a, 6a N pole permanent magnet
5b, 6b S pole permanent magnet
7,8 Field core
11,12 Auxiliary magnet row
11a, 12a N pole permanent magnet
11b, 12b S pole permanent magnet
13 Iron rod
21 Air gap
31 Electromagnet
32 cavity

Claims (3)

An armature composed of an armature core and an armature winding wound around the armature core, and a field element formed by alternately providing permanent magnets having different polarities on the field core, and between these armature and the field element In an electric motor driven by a field magnetic flux formed in a closed loop shape,
Provided with an auxiliary magnet that generates at least two closed auxiliary magnetic fluxes in cooperation with the armature and the field element,
Of these auxiliary magnetic fluxes, one auxiliary magnetic flux reduces the magnetic resistance and relaxes magnetic saturation, and the other auxiliary magnetic flux is in a forward direction with respect to the field magnetic flux, Auxiliary magnetic flux increases the magnetic resistance to facilitate magnetic saturation, and changes the state of the auxiliary magnet between the second state in which the other auxiliary magnetic flux is in a direction opposite to the field magnetic flux. A variable characteristic motor characterized by being configured as described above. In the variable characteristic motor according to claim 1,
The main magnets on the field element are set in two rows and one set, and the auxiliary magnets are also set in two rows, and the auxiliary magnet rows are integrally displaced between the main magnet rows in the first state or the second state. A variable characteristic motor configured to obtain In the variable characteristic motor according to claim 2,
The variable characteristic electric motor according to claim 1, wherein the main magnet is embedded in the field element core and the auxiliary magnet is disposed on the surface.

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