JP2007195382A - Magnetic drive mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a magnetic drive mechanism that dispenses with an excitation coil, reduces energy consumption by copper loss in the excitation coil, or the like for reducing power consumption, and has a compact and thin drive mechanism regardless of a coil diameter. <P>SOLUTION: The magnetic drive mechanism comprises a rotor having a rotor magnetic flux generation source; and a stator having a stator magnetic flux generation source, and a stator magnetic induction path for directing the magnetic flux of the stator magnetic flux generation source to the rotor. The magnetic drive mechanism controls the flow of the magnetic flux in the stator magnetic flux generation source for rotating and driving the rotor to the stator. The stator magnetic induction path comprises a pole end that shunts each pole in the stator magnetic flux generation source into a plurality of portions, and is arranged with a prescribed gap to the rotor; and a displacement application section provided between the stator magnetic flux generation source and the pole end. In this case, the size of the gap can be changed by controlling the displacement application section. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a magnetic drive mechanism, and more particularly to a magnetic drive mechanism that does not require a driving force by a coil.

  In a drive mechanism using a magnetic force, a current is normally supplied to an exciting coil to generate a magnetic force, and the rotor magnet is rotated by this magnetic force. When this driving mechanism is used as a driving source for a timepiece, for example, the stepping motor configured as described above is intermittently driven by a reference signal generated by a crystal resonator or the like (for example, see Patent Document 1).

  In the magnetic drive mechanism using the excitation coil as described above, there is a problem that it is difficult to reduce power consumption because high energy efficiency cannot be obtained because there is a copper loss for passing a drive current through the excitation coil.

  Further, in a magnetic drive mechanism using an excitation coil, the size of the mechanism is limited by the coil diameter. Therefore, in order to reduce the size and thickness of the magnetic drive mechanism, it is necessary to make the coil diameter small. However, if the coil diameter is reduced, the torque also decreases. There is also a problem that it must be made somewhat large.

  As described above, the conventional magnetic drive mechanism has problems caused by the drive part being an excitation coil, such as power consumption, restriction of the amount of magnetic flux due to magnetic saturation, miniaturization by coil diameter, restriction of thinning, etc. ing.

  In view of the above problems, a drive device has been proposed in which a magnetic force control element opens and closes the magnetic force from the permanent magnet of the stator (Patent Document 2).

JP 2002-90473 A (first page, FIG. 1) Japanese Patent Laid-Open No. 10-66364 (page 4, FIG. 2)

  As described above, the magnetic drive mechanism using an excitation coil as a drive source has problems due to the use of an excitation coil as the drive source, such as high power consumption, reduction in size and thickness due to the coil diameter. .

  In order to solve this problem and drive by magnetic on / off control by a magnetic force control element instead of coil drive is proposed in Patent Document 2 described above, the magnetic circuit is not effectively configured in this driving method, Most of the magnetic flux generated from the permanent magnet becomes a leakage magnetic flux and returns to the permanent magnet of the stator without going to the rotor. Therefore, the configuration described in Patent Document 2 has a problem that it cannot contribute to the driving of the rotor, and it is difficult to obtain high driving efficiency.

  Therefore, the present invention solves the conventional problems, eliminates the need for an exciting coil, reduces energy consumption due to copper loss of the exciting coil and the like, reduces power consumption, and reduces the size and thickness of the drive mechanism. The purpose is to provide. In addition to the above object, another object is to provide a magnetic drive mechanism that smoothly controls driving and increases driving efficiency.

  In order to achieve the above object, the magnetic drive mechanism of the present invention basically employs the following configuration.

  The magnetic drive mechanism of the present invention includes a rotor having a rotor magnetic flux generation source, a stator magnetic flux generation source, and a stator having a stator magnetic induction path for guiding the magnetic flux of the stator magnetic flux generation source to the rotor; A magnetic drive mechanism for rotating the rotor relative to the stator by controlling the flow of magnetic flux of the stator magnetic flux generation source, wherein the stator magnetic induction path is provided for each of the stator magnetic flux generation sources. Each of the poles is divided into a plurality of poles, and includes a magnetic pole tip disposed with a predetermined gap with respect to the rotor, and a displacement application unit provided between the stator magnetic flux generation source and the magnetic pole tip. By controlling the portion, the size of the gap can be changed.

  Further, the magnetic drive mechanism of the present invention drives the rotor relative to the stator by changing the magnetic field direction with respect to the rotor by switching the balance between positive and negative magnetic poles appearing at the magnetic pole end by the displacement application unit. It is characterized by making it.

  The magnetic drive mechanism of the present invention is characterized in that the amount of magnetic flux at the shunt destination from the stator magnetic flux generation source is controlled by displacing the magnetic pole end controlled by the displacement applying unit in the direction of the rotor. It is.

  Further, the magnetic drive mechanism of the present invention is configured by the magnetostrictive material in which the magnetic pole end described above makes the magnetic characteristics variable by the displacement, and the end portion disposed on the magnetostrictive material so as to face the rotor. In addition, the displacement application unit is made of a piezoelectric material and is arranged at a position where displacement can be applied to the magnetostrictive material.

  The magnetic drive mechanism of the present invention is characterized in that the aforementioned magnetic pole tip is arranged so that the displacement direction of the magnetic pole tip passes through the rotation axis of the rotor.

  According to the present invention, it is possible to configure a drive mechanism that does not require an exciting coil in the magnetic drive mechanism.

  Further, according to the present invention, it is possible to reduce the power consumption by reducing the energy consumption due to copper loss of the exciting coil and the like by eliminating the need for the exciting coil.

  In addition, according to the present invention, the drive mechanism can be made smaller and thinner regardless of the coil diameter.

  Further, according to the present invention, since the magnetic circuit is effectively configured, the amount of magnetic flux in the magnetic flux emitted from the stator magnetic flux generation source can be reduced, and the amount of magnetic flux contributing to the driving of the rotor can be increased. Driving efficiency can be increased.

The configuration and operation of the magnetic drive mechanism of the present invention will be described below.
In a magnetic drive mechanism using an excitation coil, the pole can be switched by switching the direction of the current flowing through the excitation coil. However, in a magnetic flux generation source such as a permanent magnet, the polarity is changed from positive to negative or negative depending on the current direction as in the excitation coil. From the positive pole to the negative pole, the magnetic pole cannot be switched. Therefore, in the magnetic drive mechanism of the present invention, the balance of the strength of each magnetic pole appearing at the magnetic pole end is switched by controlling the flow of magnetic flux from a magnetic flux generating source such as a permanent magnet instead of the conventional exciting coil as a driving source. This constitutes a drive mechanism for driving the magnetic member.

  Specifically, the magnetic drive mechanism of the present invention includes a rotor having a rotor magnetic flux generation source, a stator magnetic flux generation source, and a stator magnetic induction path that guides the magnetic flux of the stator magnetic flux generation source to the rotor. And a magnetic drive mechanism for rotating the rotor with respect to the stator by controlling the flow of magnetic flux of the stator magnetic flux generation source. Displacement applied between at least a pair of magnetic pole ends arranged with a predetermined gap with respect to the rotor, and between the stator magnetic flux generation source and the magnetic pole ends, by dividing each pole of the magnetic flux generation source into a plurality of And the size of the air gap can be changed by controlling the displacement application unit.

  By adopting the above configuration, the magnetic pole end to which displacement and stress are applied by the displacement applying unit is displaced in the rotor direction, and the magnetic resistance of the air gap is controlled to control the shunt destination from the stator magnetic flux generation source. The rotor can be driven to rotate relative to the stator by controlling the amount of magnetic flux, switching the balance between positive and negative magnetic poles appearing at the magnetic pole ends, and changing the magnetic field direction with respect to the rotor.

  In addition, according to the configuration of the present invention, a drive mechanism that does not require an exciting coil can be configured, so that energy consumption due to copper loss of the exciting coil or the like, which is essential in the conventional configuration, is reduced and consumed. Electric power can be reduced. The drive mechanism can be made smaller and thinner regardless of the coil diameter of the exciting coil.

  Further, since the magnetic circuit is effectively configured, the amount of magnetic flux in the magnetic flux emitted from the stator magnetic flux generation source is reduced, the amount of magnetic flux contributing to the driving of the rotor is increased, and the driving efficiency can be increased.

In the magnetic drive mechanism of the present invention, it is not always necessary to arrange the magnetic pole end so that the displacement direction of the magnetic pole end coincides with the rotational axis of the rotor magnetic flux generation source. By configuring it so that it passes through the core, the magnetic pole tip can control the magnetic resistance of the air gap between it and the rotor magnetic flux generation source with the smallest amount of displacement, and further increase the driving efficiency. Become.
A specific configuration example will be described in detail below.

First, a configuration example and operation of the magnetic drive mechanism of the present invention will be described with reference to FIG.
FIG. 1 is a perspective view showing a configuration example of a magnetic drive mechanism of the present invention.

  As shown in FIG. 1, the magnetic drive mechanism 1A according to the present invention includes a rotor and a stator. In addition, the rotor in a present Example was shown as 2 A of rotor magnetic flux generation sources. In the following description, this rotor will be described as the rotor magnetic flux generation source 2A. The rotor magnetic flux generation source 2A is capable of controlling rotation by applying an arbitrary rotational force based on an operation principle described later.

  The stator also includes a stator magnetic flux generation source 3A and stator magnetic induction paths 4An, 4As that divert the magnetic flux from each pole of the stator magnetic flux generation source 3A into a plurality of parts and guide them to the rotor magnetic flux generation source 2A, respectively. A magnetic pole tip 4Anr, 4Anl, 4Asu, 4Asd that are magnetically separated and provided at a position facing the rotor magnetic flux generation source 2A of the stator magnetic induction path 4An, 4As, and the magnetic pole tip 4Anr. 4 Anl, 4 Asu, and 4 Asd are provided with displacement application units 5 Anr, 5 Anl, 5 Asu, and 5 Asd that apply displacement to 4 Asl and 4 Asd.

The magnetic pole tips 4Anr, 4Anl, 4Asu, 4Asd are provided with gaps at equally spaced angular positions around the rotor magnetic flux generation source 2A, as will be described in detail later with reference to FIGS. The gaps are arranged so that the size of the gap can be changed arbitrarily under the action of the displacement applying portions 5Anr, 5Anl, 5Asu, and 5Asd.

  The magnetic drive mechanism 1A configured as described above controls the size of the gap between the magnetic pole tips 4Anr, 4Anl, 4Asu, 4Asd and the rotor magnetic flux generation source 2A by the displacement application units 5Anr, 5Anl, 5Asu, 5Asd. Thus, the amount of magnetic flux at the shunt destination from the stator magnetic flux generation source 3A is controlled, and the balance of the strength of the magnetic poles at the magnetic pole ends 4Anr, 4Anl, 4Asu, 4Asd is switched. As a result, the direction of the magnetic flux flowing between the magnetic pole ends 4Anr, 4Anl, 4Asu, 4Asd is effectively switched with respect to the rotor magnetic flux generation source 2A, and the rotor magnetic flux generation source disposed between the magnetic pole ends 4Anr, 4Anl, 4Asu, 4Asd. A driving force for rotationally driving 2A is applied.

Here, the steps (STEP 0 to STEP 4) for rotationally driving the rotor magnetic flux generation source 2A in the magnetic drive mechanism 1A of the present invention will be described in detail with reference to FIGS.
2 to 6 are drawings for explaining the operation principle of the magnetic drive mechanism 1A of the present invention. An enlarged view (top view) around the rotor of the magnetic drive mechanism and the top view on the right side are shown on the right side. A sectional view seen from above, and a sectional view seen from the lower side of this top view is shown at the lower position. 2 shows the state of STEP0, FIG. 3 shows the state of STEP1, FIG. 4 shows the state of STEP2, FIG. 5 shows the state of STEP3, and FIG. 6 shows the state of STEP4. The hatched arrows indicate the displacement direction of the magnetic pole ends, and the hollow arrows indicate the magnetic pole directions of the rotor.

  STEP0 shown in FIG. 2 indicates a stationary stable state in which all the displacement application units 5Anr, 5Anl, 5Asu, and 5Asd are not operated. In this state, the amount of magnetic flux at the shunt destination from the stator magnetic flux generation source 3A is equal, and the N pole, N pole, S pole, and S pole appear at the magnetic pole ends 4Anr, 4Anl, 4Asu, and 4Asd, respectively, with the same magnitude. Therefore, the rotor magnetic flux generation source 2A is balanced at the position shown in FIG. Then, after going through steps 1 to 4 to be described later, the state returns to the state of STEP 0 again, and the respective steps are repeated in order, whereby the rotor magnetic flux generating source 2A can be continuously driven.

  Next, by operating the displacement applying units 5Anl and 5Asd in STEP1 shown in FIG. 3, the size of the gap between the magnetic pole tips 4Anl and 4Asd and the rotor magnetic flux generation source 2A is increased, and the magnetic resistance is increased. As a result, the amount of magnetic flux at the magnetic pole tips 4Anr and 4Asu, which are the other diversion destinations from the stator magnetic flux generating source 3A, is increased, the magnetic pole tip 4Anr is stronger than the magnetic pole tip 4Anl as the N pole, and the magnetic pole tip as the S pole. The magnetic pole tip 4Asu appears stronger than 4Asd. As a result, the magnetic flux at the magnetic pole ends 4Anr and 4Asu acts on the rotor magnetic flux generation source 2A to rotate the rotor magnetic flux generation source 2A to the balanced state of STEP1 shown in FIG. )

  Next, by operating the displacement application units 5Anl and 5Asu in STEP2 shown in FIG. 4, the size of the gap between the magnetic pole tips 4Anl and 4Asu and the rotor magnetic flux generation source 2A is increased, and the magnetic resistance is increased. As a result, the amount of magnetic flux at the magnetic pole tip 4Anr, 4Asd, which is the other diversion destination from the stator magnetic flux generating source 3A, is increased, the magnetic pole tip 4Anr is stronger than the magnetic pole tip 4Anl as the N pole, and the magnetic pole tip as the S pole. Magnetic pole tip 4Asd appears stronger than 4Asu. As a result, the magnetic flux at the magnetic pole ends 4Anr and 4Asd acts on the rotor magnetic flux generation source 2A to rotate the rotor magnetic flux generation source 2A to the balanced state of STEP2 shown in FIG. 4 (rotates counterclockwise in the figure). ) This state is a state in which the rotor magnetic flux generation source 2A is rotated 180 degrees from STEP1 in FIG.

Next, by operating the displacement application units 5Anr and 5Asu in STEP3 shown in FIG. 5, the size of the gap between the magnetic pole tips 4Anr and 4Asu and the rotor magnetic flux generation source 2A is increased, and the magnetic resistance is increased. As a result, the amount of magnetic flux at the magnetic pole ends 4Anl and 4Asd, which are the other diversion destinations from the stator magnetic flux generating source 3A, is increased, the magnetic pole end 4Anl is stronger than the magnetic pole end 4Anr as the N pole, Magnetic pole tip 4Asd appears stronger than 4Asu. As a result, the magnetic flux at the magnetic pole ends 4Anl and 4Asd acts on the rotor magnetic flux generation source 2A to rotate the rotor magnetic flux generation source 2A to the balanced state of STEP 3 shown in FIG. 5 (rotates counterclockwise in the figure). )

  Next, by operating the displacement applying portions 5Anr and 5Asd in STEP4 shown in FIG. 6, the size of the gap between the magnetic pole tips 4Anr and 4Asd and the rotor magnetic flux generation source 2A is increased, and the magnetic resistance is increased. As a result, the amount of magnetic flux at the magnetic pole tips 4Anl and 4Asu, which are the other diversion destinations from the stator magnetic flux generating source 3A, is increased, the magnetic pole tip 4Anl is stronger than the magnetic pole tip 4Anr as the N pole, and the magnetic pole tip as the S pole. The magnetic pole tip 4Asu appears stronger than 4Asd. As a result, the magnetic flux at the magnetic pole ends 4Anl and 4Asu acts on the rotor magnetic flux generating source 2A, and the rotor magnetic flux generating source 2A is rotated to the balanced state of STEP 4 shown in FIG. ) In this state, the rotor magnetic flux generation source 2A is rotated 360 degrees from STEP1 in FIG.

  As described above, by repeating STEP0 to STEP4, the rotor magnetic flux generation source 2A can be rotated.

Next, regarding the action of the magnetic pole tips 4Anr, 4Anl, 4Asu, 4Asd and the displacement applying portions 5Anr, 5Anl, 5Asu, 5Asd in the magnetic drive mechanism 1A of the present invention, the magnetic pole tips 4Anr, 4Anl and the displacement applying portions 5Anr, 5Anl An example will be described.
FIG. 7 is a diagram for explaining the operation principle of the stator magnetic guide path, the magnetic pole end, the displacement applying unit, and the rotor magnetic flux generation source. This drawing shows a sectional view of only the stator magnetic guide path 4An around the rotor of the magnetic drive mechanism, the magnetic pole tips 4Anl and 4Anr, the displacement applying portions 5Anl and 5Anr, and the rotor magnetic flux generation source 2A. The upper diagram shows before operation of the displacement application unit 5Anl, and the lower diagram shows after operation. The magnetic pole tips 4Asu, 4Asd and the displacement applying portions 5Asu, 5Asd not shown in the drawing have the same configuration as the magnetic pole tips 4Anl, 4Anr, and the displacement applying portions 5Anl, 5Anr. The detailed explanation about is omitted.

  The magnetic pole tips 4Anl, 4Anr and the stator magnetic guide path 4An are made of a soft magnetic material such as permalloy, and form a magnetic path through which magnetic flux flows. And this magnetic pole end 4Anl is contact-fixed so that operation | movement is possible in the direction of the arrow shown to this drawing. The same applies to the magnetic pole tip 4Anr. Further, the displacement applying portions 5Anr and 5Anl are made of a material that can be displaced by an electric field or a temperature field such as a piezoelectric material or a shape memory alloy. Then, by compressing and displacing as shown in this drawing, the magnetic pole ends 4Anr and 4Anl are relatively in the direction of the arrow (in the drawing, the direction away from the rotor magnetic flux generation source 2A) relative to the stator magnetic guide path 4An. Operate.

  With the above configuration, the magnetic pole ends 4Anr, 4Anl, 4Asu, 4Asd applied with displacement by the displacement applying units 5Anr, 5Anl, 5Asu, 5Asd are displaced in the direction of the rotor magnetic flux generation source 2A, and control the magnetic resistance of the air gap. Thus, it is possible to control the amount of magnetic flux at the shunt destination from the stator magnetic flux generation source 3A, and it is possible to configure a drive mechanism that does not require an excitation coil in the magnetic drive mechanism 1A of the present invention. Energy consumption due to copper loss can be reduced to reduce power consumption.

Also, the drive mechanism can be made smaller and thinner regardless of the coil diameter. Further, when the magnetic circuit is effectively configured, the amount of magnetic flux in the magnetic flux emitted from the stator magnetic flux generation source 3A is reduced, and the amount of magnetic flux contributing to driving the rotor magnetic flux generation source 2A is increased. Can be increased.

Next, another configuration example and operation of the magnetic drive mechanism of the present invention will be described with reference to FIGS.
FIG. 8 is a perspective view showing another configuration example of the magnetic drive mechanism of the present invention.

  As shown in FIG. 8, the magnetic drive mechanism 1B according to the present invention includes a rotor and a stator. In addition, the rotor in a present Example was shown as the rotor magnetic flux generation source 2B. In the following description, this rotor will be described as the rotor magnetic flux generation source 2B. The rotor magnetic flux generation source 2B is capable of controlling rotation by applying an arbitrary rotational force based on an operation principle described later.

  The stator also splits the magnetic flux from the stator magnetic flux generation source 3B and the magnetic flux from each pole of the stator magnetic flux generation source 3B into a plurality of stator magnetic induction paths 4Bn and 4Bs that respectively guide the magnetic flux to the rotor magnetic flux generation source 2B. Magnetic pole ends 4Bnr, 4Bnl, 4Bsu, 4Bsd, which are magnetically separated single magnetic poles, and magnetic pole ends 4Bnr, which are provided at positions facing the rotor magnetic flux generation source 2B of the stator magnetic induction paths 4Bn, 4Bs. 4Bnl, 4Bsu, and 4Bsd are provided with displacement applying sections 5Bnr, 5Bnl, 5Bsu, and 5Bsd.

  Further, the magnetic pole tips 4Bnr, 4Bnl, 4Bsu, 4Bsd are subjected to the action of the displacement applying portions 5Bnr, 5Bnl, 5Bsu, 5Bsd and the like around the rotor magnetic flux generating source 2B as shown in FIGS. A space is provided at the angular position of the interval, and the size of the space is arranged to be arbitrarily variable.

  The magnetic drive mechanism 1B configured in this way controls the size of the gap between the magnetic pole tips 4Bnr, 4Bnl, 4Bsu, 4Bsd and the rotor magnetic flux generation source 2B by the displacement applying portions 5Bnr, 5Bnl, 5Bsu, 5Bsd. As a result, the amount of magnetic flux at the shunt destination from the stator magnetic flux generation source 3B is controlled, and the balance of the strength of the magnetic poles at the magnetic pole ends 4Bnr, 4Bnl, 4Bsu, 4Bsd is switched.

  As a result, the direction of the magnetic flux flowing between the magnetic pole ends 4Bnr, 4Bnl, 4Bsu, and 4Bsd is effectively switched with respect to the rotor magnetic flux generation source 2B, and the rotor magnetic flux generation source disposed between the magnetic pole ends 4Bnr, 4Bnl, 4Bsu, and 4Bsd. A driving force for rotationally driving 2B can be applied.

  Thus, in the magnetic drive mechanism 1B of the present invention, a drive mechanism that does not require an exciting coil can be configured as in the conventional configuration. Also, by eliminating the need for the exciting coil in this mechanism, it is possible to reduce the power consumption by reducing the energy consumption due to copper loss of the exciting coil or the like. Further, by eliminating the need for the excitation coil, the drive mechanism can be made smaller and thinner regardless of the coil diameter.

  Further, since the magnetic circuit is effectively configured, the amount of magnetic flux in the magnetic flux emitted from the stator magnetic flux generation source 3B is reduced, the amount of magnetic flux contributing to driving the rotor magnetic flux generation source 2B is increased, and the driving efficiency is increased. I can do it.

9 to 13 are drawings for explaining the operating principle of the magnetic drive mechanism 1B of the present invention. An enlarged view (bottom view) around the rotor of the magnetic drive mechanism and the bottom view on the right side are shown on the right side. A sectional view seen from above, and a sectional view seen from the upper side of this bottom view is shown in the upper position. Note that FIG.
Shows the state of STEP0, FIG. 10 shows the state of STEP1, FIG. 11 shows the state of STEP2, FIG. 12 shows the state of STEP3, and FIG. 13 shows the state of STEP4. The hatched arrows indicate the displacement direction of the magnetic pole ends, and the hollow arrows indicate the magnetic pole directions of the rotor.

  STEP0 shown in FIG. 9 is a stationary stable state in which all the displacement application units 5Bnr, 5Bnl, 5Bsu, and 5Bsd are not operated, and the rotor magnetic flux generation source 2B is balanced at the position shown in FIG. Then, after going through steps 1 to 4 to be described later, the state returns to the state of STEP 0 again, and the respective steps are repeated in order, so that the rotor magnetic flux generation source 2B can be continuously driven.

  Next, by operating the displacement applying portions 5Bnl and 5Bsd in STEP1 shown in FIG. 10, the size of the gap between the magnetic pole tips 4Bnl and 4Bsd and the rotor magnetic flux generation source 2B is increased, and the magnetic pole tips 4Bnl and 4Bsd are increased. 14 also changes the magnetic permeability at the same time by the action described with reference to FIG. As a result, the rotor magnetic flux generation source 2B can be rotated (rotated clockwise in the drawing) by a larger torque until the balanced state of STEP1 shown in FIG.

  Next, by operating the displacement applying sections 5Bnl and 5Bsu in STEP2 shown in FIG. 11, the size of the gap between the magnetic pole tips 4Bnl and 4Bsu and the rotor magnetic flux generation source 2B is increased, and the magnetic pole tips 4Bnl and 4Bsu are expanded. 14 also changes the magnetic permeability at the same time by the action described with reference to FIG. As a result, the rotor magnetic flux generation source 2B can be rotated (clockwise in the drawing) to the balanced state of STEP2 shown in FIG.

  Next, by operating the displacement applying units 5Bnr and 5Bsu in STEP 3 shown in FIG. 12, the size of the gap between the magnetic pole tips 4Bnr and 4Bsu and the rotor magnetic flux generation source 2B is increased, and the magnetic pole tips 4Bnr and 4Bsu are expanded. 14 also changes the magnetic permeability at the same time by the action described with reference to FIG. 14, and the magnetic resistance increases more than in the first embodiment. As a result, the rotor magnetic flux generation source 2B can be rotated (clockwise in the figure) to the balanced state of STEP3 shown in FIG.

  Next, by operating the displacement applying portions 5Bnr and 5Bsd in STEP4 shown in FIG. 13, the size of the gap between the magnetic pole tips 4Bnr and 4Bsd and the rotor magnetic flux generation source 2B is increased, and the magnetic pole tips 4Bnr and 4Bsd are The magnetic permeability is also changed at the same time by the action described with reference to FIG. As a result, the rotor magnetic flux generation source 2B can be rotated (clockwise in the figure) to the balanced state of STEP4 shown in FIG.

  As described above, the rotor magnetic flux generation source 2B can be rotated by repeatedly applying STEP0 to STEP4.

Next, the action of the magnetic pole tips 4Bnr, 4Bnl, 4Bsu, 4Bsd in the magnetic drive mechanism 1B of the present invention will be described by taking the magnetic pole tips 4Bnr, 4Bnl as an example.
FIG. 14 is a diagram for explaining the operation principle of the stator magnetic guide path, the magnetic pole end, the displacement applying unit, and the rotor magnetic flux generation source. In this drawing, a sectional view of only the stator magnetic guide path 4Bn around the rotor of the magnetic drive mechanism 1B, the magnetic pole ends 4Bnl and 4Bnr, and the rotor magnetic flux generation source 2B is shown. Before the operation of 5Bnl, the following figure shows the after operation. Note that the magnetic pole tips 4Bsu and 4Bsd not shown in this drawing have the same configuration as the magnetic pole tips 4Bnl and 4Bnr, and thus detailed description of the operation of each member is omitted.

  The magnetic pole ends 4Bnr and 4Bnl are composed of magnetostrictive materials 6Bnr and 6Bnl whose magnetic characteristics are variable by applying stress and displacement, and end portions 7Bnr and 7Bnl facing the rotor magnetic flux generation source 2B. Further, the end portions 7Bnr and 7Bnl are made of a soft magnetic material such as permalloy, and together with the stator magnetic induction path 4Bn and the magnetostrictive materials 6Bnr and 6Bnl form a magnetic path through which magnetic flux flows. In this direction, the magnetostrictive members 6Bnr and 6Bnl, which will be described later, are fixed so as to be operable in accordance with dimensional changes.

  The displacement applying portions 5Bnr, 5Bnl, 5Bsu, and 5Bsd are made of a material that can be displaced by an electric field or a temperature field such as a piezoelectric material or a shape memory alloy, and are so-called inverse magnetostrictive effect by being compressed and displaced as shown in the drawing. As a result, a compressive force acts on the magnetostrictive materials 6Bnr and 6Bnl, and the magnetic permeability changes with the dimensional change, and the magnetic resistance of the magnetic path passing through the magnetostrictive materials 6Bnr and 6Bnl increases. The end portions 7Bnr and 7Bnl operate in the direction of the arrow (in the drawing, the direction away from the rotor magnetic flux generation source 2B) relative to the stator magnetic guide path 4Bn.

  With the above configuration, the magnetic pole ends 4Bnr and 4Bnl to which displacement is applied by the displacement applying units 5Bnr and 5Bnl are displaced in the direction of the rotor magnetic flux generation source 2B to control the magnetic resistance of the air gap, and the magnetostrictive materials 6Bnr and 6Bnl By controlling the resistance at the same time, it is possible to control the amount of magnetic flux at the shunt destination from the stator magnetic flux generation source 3B. Therefore, in the magnetic drive mechanism 1B of the present invention, a drive mechanism that does not require an excitation coil can be configured, and energy consumption due to copper loss of the excitation coil or the like can be reduced, thereby reducing power consumption.

  Also, the drive mechanism can be made smaller and thinner regardless of the coil diameter. Further, when the magnetic circuit is effectively configured, the amount of magnetic flux in the magnetic flux emitted from the stator magnetic flux generation source 3B is reduced, and the amount of magnetic flux contributing to driving of the rotor magnetic flux generation source 2B is increased. Can be increased.

Moreover, the following matters can be mentioned as specific effects of the above-described embodiment.
In the magnetic drive mechanism 1B of the present invention, the magnetostrictive members 6Bnr and 6Bnl change the magnetic permeability and change the magnetic resistance due to the inverse magnetostrictive effect. Therefore, together with the change in the magnetic resistance of the air gap, It is possible to switch the balance between positive and negative in each magnetic pole appearing at 7Bnl by a larger amount as compared with the case of only the change in the magnetic resistance of the air gap. Therefore, the magnetic drive mechanism 1B of this embodiment can drive the rotor magnetic flux generation source 2B to the stator more efficiently than the mechanism of the first embodiment.

It is a perspective view which shows the structural example of the magnetic drive mechanism of this invention. Example 1 It is the enlarged view around the rotor of the magnetic drive mechanism of this invention, and sectional drawing. Example 1 3 is a diagram for explaining the operating principle of the magnetic drive mechanism of the present invention. Example 1 3 is a diagram for explaining the operating principle of the magnetic drive mechanism of the present invention. Example 1 3 is a diagram for explaining the operating principle of the magnetic drive mechanism of the present invention. Example 1 3 is a diagram for explaining the operating principle of the magnetic drive mechanism of the present invention. Example 1 It is drawing for demonstrating the effect | action in the magnetic drive mechanism of this invention. Example 1 It is a perspective view which shows the structural example of the magnetic drive mechanism of this invention. (Example 2) It is the enlarged view around the rotor of the magnetic drive mechanism of this invention, and sectional drawing. (Example 2) 3 is a diagram for explaining the operating principle of the magnetic drive mechanism of the present invention. (Example 2) 3 is a diagram for explaining the operating principle of the magnetic drive mechanism of the present invention. (Example 2) 3 is a diagram for explaining the operating principle of the magnetic drive mechanism of the present invention. (Example 2) 3 is a diagram for explaining the operating principle of the magnetic drive mechanism of the present invention. (Example 2) It is drawing for demonstrating the effect | action in the magnetic drive mechanism of this invention. (Example 2)

Explanation of symbols

1A, 1B Magnetic drive mechanism 2A, 2B Rotor magnetic flux generation source 3A, 3B Stator magnetic flux generation source 4An, 4As, 4Bn, 4Bs Stator magnetic induction path 4Anr, 4Anl, 4Asu, 4Asd, 4Bnr, 4Bnl, 4Bsu, 4Bsd
Magnetic pole tip 5 Anr, 5 Anl, 5 Asu, 5 Asd, 5 Bnr, 5 Bnl, 5 Bsu, 5 Bsd
Displacement application section 6Bnr, 6Bnl magnetostrictive material 7Bnr, 7Bnl end

Claims (5)

A rotor having a rotor magnetic flux source;
A stator having a stator magnetic flux generation source and a stator magnetic induction path for guiding the magnetic flux of the stator magnetic flux generation source to the rotor;
A magnetic drive mechanism for rotating the rotor relative to the stator by controlling a flow of magnetic flux of the stator magnetic flux generation source;
The stator magnetic guiding path is
Magnetic pole tips arranged with a predetermined gap with respect to the rotor, each of the poles of the stator magnetic flux generation source is divided into a plurality of branches,
A displacement application unit provided between the stator magnetic flux generation source and the magnetic pole end,
A magnetic drive mechanism characterized in that the size of the gap can be changed by controlling the displacement application section.   The rotor is driven to rotate with respect to the stator by changing the magnetic field direction with respect to the rotor by switching the balance between positive and negative magnetic poles appearing at the magnetic pole end by the displacement application unit. The magnetic drive mechanism according to claim 1.   3. The magnetism according to claim 2, wherein a magnetic flux amount at a shunt destination from the stator magnetic flux generation source is controlled by displacing the magnetic pole end controlled by the displacement application unit in a rotor direction. Drive mechanism. The magnetic pole end is composed of a magnetostrictive material whose magnetic characteristics are variable by the displacement, and an end portion which is disposed on the magnetostrictive material so as to face the rotor,
The magnetic drive mechanism according to claim 3, wherein the displacement applying unit is made of a piezoelectric material, and is disposed at a position where the displacement can be applied to the magnetostrictive material.   5. The magnetic drive mechanism according to claim 1, wherein the magnetic pole end is arranged so that a displacement direction of the magnetic pole end passes through a rotation axis of the rotor. 6.

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