JP2008312427A - Brushless motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brushless motor in which the configuration of a drive control circuit is simpler and more efficient. <P>SOLUTION: The brushless motor is provided with a permanent magnet 32 magnetized in a direction perpendicular to a drive direction, and a coil portion 10 opposing the permanent magnet. An electromagnetic coil 12 of the coil portion 10 is wound around an axis parallel to the drive direction. A drive control circuit supplies a drive current in a given first electric current direction to the electromagnetic coil 12 without changing the electric current direction to supply the current to the electromagnetic coil 12, thereby operating the brushless motor in the drive direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a brushless motor using a permanent magnet and an electromagnetic coil.

  As a brushless motor, for example, one described in Patent Document 1 below is known.

JP 2001-298882 A

  Conventional brushless motors are operated in a predetermined driving direction by appropriately switching the direction of the current applied to the electromagnetic coil. However, the configuration of the drive control circuit for switching the current direction is complicated, and there is a problem that a loss occurs with the switching.

  An object of the present invention is to provide a brushless motor with a simpler and more efficient drive control circuit.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

Application Example 1 A brushless motor operable in a predetermined driving direction,
A first driving member including a first permanent magnet magnetized in a direction perpendicular to the driving direction;
A second drive member including an electromagnetic coil provided opposite to the first drive member and wound around a direction parallel to the drive direction;
A drive control circuit for supplying power to the electromagnetic coil;
With
The drive control circuit operates the brushless motor in the drive direction by supplying a drive current in a predetermined first current direction to the electromagnetic coil without changing the direction of the current supplied to the electromagnetic coil. Brushless motor.

  In this brushless motor, there is a difference in the magnitude of the driving force between the coil portion closer to the permanent magnet and the coil portion farther from the permanent magnet, so a net driving force equal to this difference is generated. Accordingly, it is possible to operate the brushless motor in the driving direction by supplying a driving current in a predetermined first current direction to the electromagnetic coil.

[Application Example 2] The brushless motor according to Application Example 1,
The electromagnetic coil is a brushless motor wound around a magnetic flux shielding member with a direction parallel to the driving direction as an axis.

  In this brushless motor, since the magnetic flux of the permanent magnet is shielded by the magnetic flux shielding member, the permanent magnet is provided on the coil portion (outer coil portion) outside the magnetic flux shielding member (on the opposite side of the permanent magnet across the magnetic flux shielding member). Since no magnetic flux reaches the outer coil portion, no driving force is generated from the outer coil portion. On the other hand, driving is performed from the coil portion (inner coil portion) inside the magnetic flux shielding member (between the magnetic flux shielding member and permanent magnet). Force is generated. Therefore, it is possible to operate the brushless motor in the driving direction by supplying a driving current in a predetermined first current direction to the electromagnetic coil without changing the direction of the current supplied to the electromagnetic coil.

[Application Example 3] The brushless motor according to Application Example 1,
As the coil part, first and second coil parts are respectively provided on both sides of the first permanent magnet,
Among the electromagnetic coils of the first coil portion, among the electromagnetic coils of the second coil portion, the current flowing through the inner coil portion closer to the first permanent magnet than the magnetic flux shielding member In the brushless motor, the electromagnetic coils are connected so that the current flowing through the inner coil portion closer to the first permanent magnet than the magnetic flux shielding member flows in directions parallel to each other.

[Application Example 4] The brushless motor according to Application Example 1,
A driving force generation preventing member for preventing generation of driving force due to electromagnetic interaction between a part of the electromagnetic coil and the first permanent magnet;
The electromagnetic coil has a first coil portion on the side facing the first permanent magnet, and a second coil portion on the side opposite to the first coil portion,
The drive force generation preventing member allows generation of electromagnetic interaction between the first coil portion and the first permanent magnet, and between the second coil portion and the first permanent magnet. Brushless motor that prevents electromagnetic interaction between the two.

  In this brushless motor, an electromagnetic interaction between the first coil portion and the first permanent magnet occurs in the first coil portion, but in the second coil portion opposite to the first coil portion, the first permanent magnet and Since no electromagnetic interaction occurs, the brushless motor operates in the driving direction by supplying a driving current in a predetermined first current direction to the electromagnetic coil without changing the direction of the current supplied to the electromagnetic coil. It is possible to make it.

[Application Example 5] The brushless motor according to Application Example 4,
The driving force generation preventing member is a second permanent magnet provided on the opposite side of the first permanent magnet across the second driving member,
The brushless motor, wherein the second permanent magnet is installed such that the same pole as the first permanent magnet faces each other.

  In this configuration, since the electromagnetic interaction between the second coil portion and the first permanent magnet does not occur due to the influence of the magnetic field of the second permanent magnet, the second permanent magnet serves as a driving force generation preventing member. It can be understood that this function is realized. Further, in this configuration, since an electromagnetic interaction acts between the second permanent magnet and the second coil portion, a driving force can be generated not only from the first coil portion but also from the second coil portion. It becomes possible. As a result, there is an effect that a larger driving force can be generated.

[Application Example 6] The brushless motor according to Application Example 5,
The brushless motor, wherein the electromagnetic coil is an air-core coil or a coil having a core material made of a non-magnetic material.

  In this configuration, since excessive force does not act between the core material of the electromagnetic coil and the permanent magnet, smooth driving can be realized.

[Application Example 7] The brushless motor according to Application Example 5,
The electromagnetic coil includes, as a core material, a magnet assembly composed of two permanent magnets that are attracted to the magnetic body member with the same poles facing each other across the magnetic body member,
The brushless motor, wherein the two permanent magnets of the magnet assembly are arranged such that different poles face each other of the first and second permanent magnets.

  In this configuration, since the magnetic field at the position of the electromagnetic coil by the first second permanent magnet can be increased, the driving force can be increased.

[Application Example 8] The brushless motor according to Application Example 4,
The driving force generation preventing member includes a second permanent magnet provided as a core material of the electromagnetic coil,
The brushless motor, wherein the second permanent magnet is installed such that poles different from the first permanent magnet face each other.

  Also with this configuration, the electromagnetic interaction between the second coil portion and the first permanent magnet does not occur due to the influence of the magnetic field of the second permanent magnet, so that the second permanent magnet is a driving force generation preventing member. It can be understood that the function is realized.

[Application Example 9] The brushless motor according to any one of Application Examples 1 to 8,
The first permanent magnet is a brushless motor that is a plate-like magnet having a thickness along a magnetization direction of the first permanent magnet.

  With this configuration, an efficient brushless motor with a small size can be easily obtained.

[Application Example 10] The brushless motor according to any one of Application Examples 1 to 9,
The drive control circuit supplies the drive current to the electromagnetic coil in a direction opposite to the first current direction, thereby operating the brushless motor in a direction opposite to the drive direction.

  In this configuration, the brushless motor can be arbitrarily reversed.

[Application Example 11] The brushless motor according to any one of Application Examples 1 to 10,
The first permanent magnet is a brushless motor having a concave portion or a convex portion provided along a direction intersecting with the driving direction.

[Application Example 12] The brushless motor according to any one of Application Examples 1 to 11,
The brushless motor is a rotary motor, and the driving direction is a rotation direction.

[Application Example 13] The brushless motor according to any one of Application Examples 1 to 11,
The brushless motor is a rectilinear motor, and the driving direction is a rectilinear direction.

[Application Example 14] The brushless motor according to any one of Application Examples 1 to 13,
A driven member driven by the brushless motor;
Electronic equipment comprising.

[Application Example 15] The electronic device according to Application Example 14,
The electronic device is an electronic device, which is a projector.

[Application Example 16] The brushless motor according to any one of Application Examples 1 to 13,
A driven member driven by the brushless motor;
A fuel cell for supplying power to the brushless motor;
Equipment using fuel cells.

  The present invention can be realized in various forms, for example, in the form of an electric motor, a control method thereof, an actuator using them, an electronic device, and the like.

Next, embodiments of the present invention will be described in the following order.
A. First embodiment:
B. Second embodiment:
C. Variation:

A. First embodiment:
FIG. 1A is a perspective view showing a schematic configuration of a permanent magnet and a coil portion used in the brushless motor according to the first embodiment of the present invention. In this example, the coil portions 10 are provided at positions facing the permanent magnet 32 on both sides of the permanent magnet 32. Each coil unit 10 is configured by a magnetic flux shielding member 14 and an electromagnetic coil 12 wound around the magnetic flux shielding member 14. The magnetic flux shielding member 14 can be formed of a magnetic material, and is particularly preferably formed of a high magnetic permeability material such as permalloy. FIG. 1A shows the driving direction DD of the brushless motor. It can be understood that the electromagnetic coil 12 is wound around the magnetic flux shielding member 14 with a direction parallel to the driving direction DD of the motor as an axis. The electromagnetic coil 12 is covered with an insulating material.

  FIG. 1B is a front view of the permanent magnet and the coil portion. The permanent magnet 32 is a plate-like magnet, and is magnetized in a direction perpendicular to the motor driving direction DD (up and down direction in FIG. 1B). That is, the direction of the magnetic flux Bt of the permanent magnet 32 is perpendicular to the drive direction DD.

  In FIG. 1B, the inner coil portion 12 i in which the electromagnetic coil 12 is closer to the permanent magnet 32 than the magnetic flux shielding member 14 and the outer coil that is farther from the permanent magnet 32 than the magnetic flux shielding member 14. It is divided into a portion 12o. The distinction between the coil portions 12i and 12o is merely for convenience, and both are part of the same coil that circulates around the magnetic flux shielding member 14. The mark indicating the inner coil portion 12i (with a black dot in the circle) means that current flows from the back side to the front side of the page. That is, current flows in the same direction in the two inner coil portions 12 i on both sides of the permanent magnet 32. A mark indicating the outer coil portion 12o (with a circle in the circle) means that current flows from the front side to the back side of the paper. FIG. 1A shows the current direction CD.

  When the motor is configured with the coil portion 10 as a stator, a force in the driving direction DD is generated from the electromagnetic coil 12 to the permanent magnet 32 by the current flowing through the inner coil portion 12 i and the magnetic flux Bt of the permanent magnet 32. On the other hand, since the magnetic flux Bt of the permanent magnet 32 is shielded by the magnetic flux shielding member 14, the magnetic flux Bt of the permanent magnet 32 does not reach the outer coil portion 12o. FIG. 1C is a side view of FIG. 1B viewed from the driving direction DD. As indicated by a broken line in FIG. 1C, the magnetic flux Bt is shielded by the magnetic flux shielding member 14 and hardly reaches the outer coil portion 12o. Due to the effect of the magnetic flux shielding member 14, no driving force is generated from the outer coil portion 12o, so that it can be understood that the driving force from the inner coil portion 12i works as the driving force of the motor.

  In the configuration of FIG. 1, one of the two coil portions 10 may be omitted. However, if the coil portions 10 are provided on both sides of the permanent magnet 32, the driving force can be almost doubled, and the possibility that the driving force is generated in a direction other than the driving direction DD is reduced. It is possible. In order to efficiently generate the driving force of the motor, each of the permanent magnet 32 and the magnetic flux shielding member 14 is configured as a plate-like member whose thickness direction is the direction along the magnetization direction of the permanent magnet 32. Preferably it is. Further, if such a plate-like magnetic flux shielding member 14 is used, the size (particularly the thickness) of the brushless motor can be reduced.

  In the configuration of FIG. 1, the insulation-coated electromagnetic coil 12 is directly wound around the magnetic flux shielding part 14. However, in order to improve insulation quality, a bobbin may be provided and the electromagnetic coil 12 may be wound around the bobbin. Good. At this time, various configurations in which the bobbin structure includes the magnetic flux shielding portion can be employed. For example, you may make it insert the magnetic flux shielding part 14 in the inside of a hollow bobbin. Or you may make it comprise the bobbin itself with a magnetic flux shielding member.

  FIG. 2 shows a modification of the shape of the permanent magnet 32, and corresponds to FIG. The permanent magnet 32a has a trapezoidal portion 32d extending in a substantially trapezoidal shape (or a substantially fan shape) at both ends thereof. This trapezoidal part 32d can make the length of the coil part which produces | generates an effective driving force among the electromagnetic coils 12 longer than the structure of FIG.1 (C). As a result, it is possible to generate the driving force more efficiently.

  FIG. 3A is a cross-sectional view showing a configuration of a rotary brushless motor as a first example of the first embodiment of the present invention. The motor 100 includes a stator including the coil unit 10 and a rotor unit 30 including the permanent magnet 32. As shown in FIG. 3B, the rotor unit 30 includes a plate-like permanent magnet 32 having an annular outer shape. The center of the rotor unit 30 is fixed to the rotating shaft 112. The rotating shaft 112 is held by a bearing portion 114. A magnetic yoke member 34 is provided on the outer periphery of the permanent magnet 32. The magnetic yoke member 34 can be omitted. FIG. 3C shows a horizontal cross section of the stator including the coil portion 10. The magnetic flux shielding member 14 is a plate-like member having a ring-shaped outer shape. The electromagnetic coil 12 is wound around an axis concentric with the outer circumferential circle of the magnetic flux shielding member 14 through the substantial center of the magnetic flux shielding member 14. The electromagnetic coil 12 can be formed by, for example, a flat coil in which a long and thin plate-like conductive wire is wound, but is simplified in each drawing of the present specification. As shown in FIG. 3A, the electromagnetic coil 12 is installed on a substrate (circuit substrate) 16. A stator composed of the coil unit 10 and the substrate 16 is fixed to the casing 102 of the motor 100.

  FIG. 4 shows an example of specific shapes of the magnetic flux shielding member 14 and the electromagnetic coil 12. As shown in FIGS. 4A and 4B, the magnetic flux shielding member 14 and the electromagnetic coil 12 are each composed of two parts whose outer shapes are semi-ring shapes. At the boundary of the semi-ring-shaped member constituting the magnetic flux shielding member 14, there is a split portion 14s (separating portion). FIG. 4C is a plan view showing a shape in which the magnetic flux shielding member 14 and the electromagnetic coil 12 are combined, and FIG. 4D is a cross-sectional view thereof. As shown in FIG. 4 (D), the two magnetic flux shielding members 14 are respectively inserted into spaces (hollow portions) provided in the electromagnetic coil 12, and then connected to each other as shown in FIG. 4 (C). Is done. FIG. 4E shows the E portion of FIG. 4C in an enlarged manner. Here, wedge-shaped connecting members 14c are fitted on the upper side and the lower side of the split portion 14s, thereby connecting the semi-ring-shaped magnetic flux shielding members 14 to each other.

  FIG. 5 shows an example of the shape when the magnetic flux shielding member 14 and the electromagnetic coil 12 are each divided into four. As can be understood from these examples, not only a motor using the straight plate-like permanent magnet 32 and the magnetic flux shielding member 14 as shown in FIG. 1A, but also a permanent magnet or magnetic flux shielding member having a bent shape. A motor using can also be realized.

  FIG. 6 is a block diagram illustrating a configuration of a drive control circuit of the brushless motor in the embodiment. The drive control circuit includes a CPU system 300, a drive signal generation unit 200, a drive driver unit 210, a regeneration control unit 220, a battery 230, and a power storage control unit 240. The drive signal generation unit 200 generates a drive signal to be supplied to the drive driver unit 210.

  FIG. 7 is a circuit diagram showing a configuration of the drive driver unit 210. The drive driver unit 210 constitutes an H-type bridge circuit. From the drive signal generation unit 200, one of the first drive signal DRVA1 and the second drive signal DRVA2 is supplied to the drive driver unit 210. Currents IA1 and IA2 shown in FIG. 6 indicate directions of currents (also referred to as “drive currents”) that flow in accordance with these drive signals DRVA1 and DRVA2. For example, when the current IA1 flows according to the first drive signal DRVA1, the motor operates in a predetermined first drive direction, and when the current IA2 flows according to the second drive signal DRVA2, the motor It operates in a second driving direction opposite to the first driving direction. The first driving direction is, for example, a direction indicated by an arrow DD in FIG. Alternatively, in the case of a rotary motor as shown in FIG. 3, the first drive direction is clockwise, for example, and the second drive direction is counterclockwise. As the drive signals DRVA1 and DRVA2, for example, a constant on signal, a periodic pulse signal, or the like can be used.

  The drive signal generation unit 200 can be configured to generate only one of the two drive signals DRVA1 and DRVA2. In this case, the motor can be driven only in one direction, but this is sufficient in an implementation example such as a fan motor.

  FIG. 8 is a circuit diagram showing an internal configuration of the regeneration control unit 220. The regeneration control unit 220 is connected to the electromagnetic coil 12 in parallel with the drive driver unit. The regeneration control unit 220 includes a rectifier circuit 222 formed of a diode and a switching transistor 224. When the switching transistor 224 is turned on by the power storage control unit 240, the power generated in the electromagnetic coil 12 can be regenerated to charge the battery 230. It is also possible to supply current from the capacitor 230 to the electromagnetic coil 12. Note that the regeneration control unit 220, the battery 230, and the power storage control unit 240 may be omitted.

  Thus, in the brushless motor of the first example of the first embodiment, the magnetic flux shielding member 14 is provided at a position facing the permanent magnet 32, and the electromagnetic coil 12 is wound around the magnetic flux shielding member 14. By causing a current in a certain direction to flow through the electromagnetic coil 12, a force in a predetermined driving direction can be generated in the motor. That is, in the brushless motor of the present embodiment, it is possible to operate the brushless motor without switching the driving voltage and driving current by the control circuit.

  FIG. 9 shows the configuration of the rotary brushless motor in the second example of the first embodiment. This motor 100a is provided with a stator including a coil part 10 on the upper side and the lower side of the rotor part 30 of the motor of the first example of the first embodiment shown in FIG. This point is the same as that of the first embodiment shown in FIG. The motor of the second embodiment can generate a driving force approximately twice that of the motor of the first embodiment.

  FIG. 10 shows the configuration of the rotary brushless motor in the third example of the first embodiment. The motor 100b has a configuration in which a rotor portion 30 is provided on each of an upper side and a lower side of a stator including the coil portion 10. In this motor, an effective driving force can be generated from the upper coil portion and the lower coil portion of the magnetic flux shielding member 14, respectively. Therefore, it is possible to improve the efficiency as compared with the first embodiment (FIG. 3) and the second embodiment (FIG. 9).

  FIG. 11 shows the configuration of the rotary brushless motor in the fourth example of the first embodiment. In the motor 100 c, the rotor portion 30 including the hollow cylindrical permanent magnet 32 and the stator including the coil portion 10 are configured in a concentric cylindrical shape with the rotation shaft 112 as the center. Such a motor can also generate an effective driving force in accordance with the principle described in FIG.

  FIG. 12 shows the configuration of the rotary brushless motor in the fifth example of the first embodiment. In this motor 100d, the rotor portion 30 of the fourth embodiment shown in FIG. 11 is changed to a double cylindrical structure, and a permanent magnet is also provided inside the stator. In this configuration, as in the motor shown in FIG. 10, an effective driving force can be generated from both sides of the coil, and an efficient motor can be obtained.

  FIG. 13 shows the configuration of a linear motor as a sixth example of the first embodiment. The linear motor 1000 includes a fixed guide part 1100 and a moving part 1200. As shown in FIG. 13A, a plate-like permanent magnet 32 extending in the moving direction is provided at the center of the fixed guide portion 1100. The moving part 1200 is configured to sandwich the fixed guide part 1100 in the vertical direction, and the coil part 10 including the magnetic flux shielding member 14 and the coil 12 is provided on the upper side and the lower side of the permanent magnet 32 so as to face each other. . As illustrated in FIG. 13B, the moving unit 1200 is provided with a drive control unit 1250. The drive controller 1250 has a self-supporting power supply device (not shown) such as a fuel cell. The fixed guide portion 1100 is provided with a rail 1120 for guiding the moving portion 1200. The moving part 1200 is slidably held on the rail 1120 by a bearing part 1140. The brushless motor according to the present invention can also be realized as such a linear motor.

  FIG. 14 shows a configuration of a linear motor as a seventh example of the first embodiment. The linear motor 1010 is different from the sixth embodiment shown in FIG. 13 in the configuration of the fixed guide portion 1100. That is, in the seventh embodiment, two permanent magnets 32 are provided at the center of the fixed guide portion 1100 with the magnetic yoke member 34 interposed therebetween. The magnetization directions of these two magnets 32 may be the same or opposite. Further, the permanent magnet 32 and the magnetic yoke member 34 are provided at positions outside the moving portion 1200 on both sides of the fixed guide portion 1100. In the seventh embodiment, by providing these four permanent magnets 32, the upper and lower coil portions of the two coil portions 10 (the inner coil portion 12i and the outer coil portion 12o described in FIG. 1B). Can be used effectively.

  FIG. 15 shows the configuration of a linear motor as an eighth example of the first embodiment. The linear motor 2000 includes a fixed guide part 2100 and a moving part 2200. As shown in FIG. 15A, a plate-shaped magnetic flux shielding member 14 extending in the moving direction is provided at the center of the moving unit 2200, and the electromagnetic coil 12 is wound around the plate-like magnetic flux shielding member 14. The fixed guide portion 2100 is configured to sandwich the moving portion 2200 in the vertical direction, and two permanent magnets 32 are provided to face each other. As shown in FIG. 15B, the moving unit 2200 is provided with a drive control unit 2250. The drive control unit 2250 has a self-supporting power supply device (not shown) such as a fuel cell. The fixed guide portion 2100 is provided with a rail 2120 for guiding the moving portion 2200. The moving part 2200 is slidably held on the rail 2120 by a bearing part 2140. This linear motor is in a reverse relationship to the sixth embodiment shown in FIG. 13 in that a permanent magnet is used for the fixed guide portion and an electromagnetic coil is used for the moving portion. As can be understood from the various examples of the first embodiment described above, the brushless motor according to the first embodiment of the present invention adopts the configuration of the coil portion shown in FIGS. It can be realized with various mechanical structures.

B. Second embodiment:
FIG. 16A is a perspective view showing a first configuration example of a permanent magnet and a coil portion used in the brushless motor according to the second embodiment of the present invention. In this configuration example, the permanent magnet 32 and the coil portion 10a including the electromagnetic coil 12 are provided to face each other. FIG. 16A shows the driving direction DD of the brushless motor. It can be understood that the electromagnetic coil 12 is wound around a direction parallel to the driving direction DD of the motor. The electromagnetic coil 12 is covered with an insulating material.

  FIG. 16B is a front view of the permanent magnet and the coil portion. FIG. 16C is a side view of FIG. 16B and is a view seen from the driving direction DD. As shown in these drawings, a magnetic yoke 34 is preferably provided on the back side of the permanent magnet 32 (on the side opposite to the coil portion 10a). The permanent magnet 32 is a plate-like magnet and is magnetized in a direction perpendicular to the motor drive direction DD (the vertical direction in FIGS. 16B and 16C). That is, the direction of the magnetic flux Bt of the permanent magnet 32 is perpendicular to the drive direction DD. The coil portion 10 a includes a core member 20 including a magnetic member 14 and a permanent magnet 15 provided on the magnetic member 14. The electromagnetic coil 12 is wound around the core member 20. The permanent magnets 15 and 32 are arranged so that different poles face each other. In the examples of FIGS. 16B and 16C, the north pole of the permanent magnet 32 and the south pole of the permanent magnet 15 are opposed to each other, but these can be reversed. The magnetic member 14 can be formed of various magnetic materials, and is particularly preferably formed of a high magnetic permeability material such as permalloy.

  In FIG. 16B, the electromagnetic coil 12 is depicted by being divided into an upper coil portion 12 u existing on the side closer to the permanent magnet 32 and a lower coil portion 12 d existing on the side farther from the permanent magnet 32. The distinction between these coil portions 12u and 12d is merely for convenience, and both are part of the same coil that circulates around the core member 20. A mark indicating the upper coil portion 12u (with a circle in the circle) means that current flows from the front side to the back side of the paper. The mark indicating the lower coil portion 12d (with a black dot in the circle) means that current flows from the back side of the paper to the front side. FIG. 16A shows this current direction CD.

  As shown in FIGS. 16B and 16C, a magnetic flux Bt (magnetic field) from the permanent magnet 32 reaches the upper coil 12 portion u. Therefore, when a current flows through the upper coil portion 12u, an electromagnetic interaction acts between the current and the permanent magnet 32, and a driving force is generated. On the other hand, the core member 20 almost completely shields the magnetic field generated by the permanent magnet 32 and prevents the magnetic field from reaching the lower coil portion 12d. Therefore, even if a current flows through the lower coil portion 12d, the electromagnetic interaction with the permanent magnet 32 hardly occurs. In other words, the core member 20 allows generation of electromagnetic interaction between the upper coil portion 12u and the permanent magnet 32, and generation of electromagnetic interaction between the lower coil portion 12d and the permanent magnet 32. It has a function as a driving force generation preventing member for preventing the above. Note that one of the magnetic member 14 and the permanent magnet 15 constituting the core member 20 may be omitted.

  In order to efficiently generate the driving force of the motor, each of the permanent magnet 32 and the core member 20 is configured as a plate-like member whose thickness direction is a direction along the magnetization direction of the permanent magnet 32. It is preferable. Further, if such a plate-like member is used, the size (particularly the thickness) of the brushless motor can be reduced.

  In the configuration of FIG. 16, the insulation-coated electromagnetic coil 12 is wound directly around the core member 20. However, in order to improve insulation quality, a bobbin may be provided and the electromagnetic coil 12 may be wound around the bobbin. . At this time, various configurations in which the bobbin structure includes the core member can be employed. For example, the core member 20 may be inserted into the hollow bobbin. Alternatively, the bobbin itself may be configured by the core member 20.

  FIG. 17 is an explanatory view showing a modification of the core member in the first configuration example shown in FIG. 16. The coil portion 10b in FIG. 17A is obtained by omitting the magnetic member 14 from the coil portion 10a in FIG. Also with this configuration, substantially the same effect as the configuration shown in FIG. 16 can be obtained. The coil portion 10c in FIG. 17B employs a nonmagnetic member as the core member 20a. Even when the non-magnetic core member 20a is used, there is a difference in driving force between the upper coil portion 12u and the lower coil portion 12d. That is, since the upper coil portion 12u is closer to the magnet 32, a larger driving force than the lower coil portion 12d is generated. Therefore, a net driving force is generated by the difference in driving force between the coil portions 12u and 12d. As a result, it is possible to drive the motor in a predetermined driving direction by continuing to flow current in the same direction.

  FIG. 18A is a perspective view showing a second configuration example of the permanent magnet and the coil portion in the second embodiment. In this configuration example, two permanent magnets 32u and 32d are provided above and below the coil portion 10d. The two permanent magnets 32u and 32d are arranged so that the same poles face each other. In this example, the N poles face each other, but the S poles may face each other.

  FIG. 18B is a front view of the permanent magnet and the coil portion, and FIG. 18C is a side view of FIG. 18B. As shown in these drawings, it is preferable that magnetic yokes 34 are respectively provided on the rear side of the permanent magnets 32u and 32d (on the side opposite to the coil portion 10d). The coil portion 10d is obtained by winding the electromagnetic coil 12 around the core member 20a. The core member 20a is formed of a nonmagnetic member. As the non-magnetic member, for example, vegetable resin, carbon-based resin (glassy carbon, CFRP (carbon fiber reinforced plastic), carbon fiber, etc.), ceramics (steatite, alumina, zirconia, etc.) can be adopted. As shown in FIG. 18B, the magnetic flux Bt1 generated by the first permanent magnet 32u reaches the upper coil portion 12u of the electromagnetic coil 12, but does not reach the lower coil portion 12d. On the contrary, the magnetic flux Bt2 generated by the second permanent magnet 32d reaches the lower coil portion 12d, but does not reach the upper coil portion 12u.

  FIG. 18D is a graph showing the strength of the magnetic field (the strength of the magnetic field) by the two permanent magnets 32u and 32d along the vertical direction of FIG. As can be understood from this graph, the direction of the magnetic field is reversed between the upper coil portion 12u and the lower coil portion 12d. Therefore, when a current in the direction CD shown in FIGS. 18A and 18B flows through the electromagnetic coil 12, a driving force in the same direction DD is generated in the two permanent magnets 32u and 32d. It is preferable that the magnetic field strength (that is, the magnetic flux density) in the upper coil portion 12u and the magnetic field strength in the lower coil portion 12d are equal to each other. For this purpose, it is preferable to use magnets having the same dimensions and characteristics as the two permanent magnets 32u and 32d, and to make the distance from the electromagnetic coil 12 to the two permanent magnets 32u and 32d equal.

  In the configuration example of FIG. 18, the second permanent magnet 32d allows generation of electromagnetic interaction between the upper coil portion 12u and the first permanent magnet 32u, and the lower coil portion 12d and the first permanent magnet 32u. It can also be considered that it functions as a driving force generation preventing member that prevents the generation of electromagnetic interaction with the magnet 32u. However, electromagnetic interaction also occurs between the second permanent magnet 32d and the lower coil portion 12d. That is, since a driving force is generated from both the upper coil portion 12u and the lower coil portion 12d, a large driving force can be obtained.

  FIG. 19 is an explanatory view showing a modification of the core member in the second configuration example of the second embodiment shown in FIG. In the configuration of FIG. 19A, a magnet assembly is employed as the core member 20b of the coil portion 10e. The magnet assembly 20b includes a magnetic member 14 and two permanent magnets 15 sandwiching the magnetic member 14. The two permanent magnets 15 are attracted to the magnetic body member 14 with the same poles facing each other. The main surface of the magnetic member 14 (surface in contact with the magnet) preferably has a size equal to or larger than the main surface of the permanent magnet 15 (surface in contact with the magnetic member 14). In this configuration, no repulsive force acts between the two magnets 15, and the individual magnets 15 are held in a state of being attracted to the magnetic member 14. Therefore, a structure in which the same pole (S pole in this example) of the magnet 15 faces in the opposite direction (in the figure, the vertical direction) across the magnetic member 14 can be maintained in a stable state. In the configuration of FIG. 19B, no core member is provided inside the electromagnetic coil 12 and it is hollow. In this specification, the coil having such a configuration is also referred to as an “air-core coil”.

  In the configurations of FIGS. 19A and 19B, the distribution of the magnetic field is almost the same as that shown in FIG. Therefore, it is possible to generate a driving force in the same driving direction DD from the upper coil portion 12u and the lower coil portion 12d. As can be understood from this description, in the configuration in which the permanent magnets 32u and 32d are disposed on the upper side and the lower side of the electromagnetic coil 12, the electromagnetic coil 12 can be configured as an air-core coil, or in the vertical direction. It is also possible to configure as a coil having various core members having a symmetrical structure. However, when an air-core coil is used, or when the core member is made of a non-magnetic material member, an extra force does not act between the core and the permanent magnets 32u and 32d, so that smoother driving is realized. There is an advantage that you can.

  FIG. 20A is a cross-sectional view showing a configuration of a rotary brushless motor as a first example of the first embodiment of the present invention. The motor 110 includes a stator including a coil portion 10 a and a rotor portion 30 including a permanent magnet 32. The configuration shown in FIG. 16 is adopted as the configuration of the coil portion 10a and the permanent magnet 32. As shown in FIG. 20B, the rotor portion 30 has a plate-like permanent magnet 32 having an annular outer shape. The center of the rotor unit 30 is fixed to the rotating shaft 112. The rotating shaft 112 is held by a bearing portion 114. A magnetic yoke member 34 is provided on the outer periphery of the permanent magnet 32. The magnetic yoke member 34 can be omitted. FIG. 20C shows a horizontal cross section of the stator including the coil portion 10 a, and is a view cut at the position of the magnetic member 14. The magnetic member 14 is a plate-like member having a substantially ring-shaped outer shape, and four protrusions are provided around it to be connected to the casing 102. However, these protrusions can be omitted. The electromagnetic coil 12 is wound around a circular shaft that passes through substantially the center of the magnetic member 14 (a shaft that is concentric with the outer and inner circles of the magnetic member 14). The electromagnetic coil 12 can be formed by, for example, a flat coil in which a long and thin plate-like conductive wire is wound, but is simplified in each drawing of the present specification. As shown in FIG. 20A, the electromagnetic coil 12 is installed on a substrate (circuit substrate) 16. A stator composed of the coil portion 10 a and the substrate 16 is fixed to the casing 102 of the motor 110.

  FIG. 21 shows an example of a specific shape of the coil portion 10a. As shown in FIGS. 21A, 21B, and 21C, the magnetic member 14, the electromagnetic coil 12, and the permanent magnet 15 each have two portions whose outer shapes are semi-ring shapes. There is a split portion 14s (separating portion) at the boundary of the semi-ring-shaped member constituting the magnetic member 14. FIG. 21D is a plan view showing a shape in which the magnetic member 14 and the electromagnetic coil 12 are combined, and FIG. 21E is a cross-sectional view thereof. In FIG. 21D, the permanent magnet 15 is omitted for convenience of illustration. As shown in FIG. 21E, the semi-ring-shaped magnetic member 14 and the permanent magnet 15 are respectively inserted into spaces (hollow portions) provided in the semi-ring-shaped electromagnetic coil 12, and thereafter, They are connected to each other as shown in 21 (D). FIG. 21F illustrates an enlarged F portion of FIG. Here, wedge-shaped connecting members 14c and 14d are fitted on the upper side and the lower side of the split portion 14s, thereby connecting the semi-ring-shaped magnetic members 14 to each other.

  FIG. 22 shows an example of the shape when the magnetic member 14 and the electromagnetic coil 12 are each divided into four. As can be understood from these examples, not only motors using straight plate-like permanent magnets and magnetic yoke members as shown in FIGS. 16 and 18, but also permanent magnets and magnetic yoke members having bent shapes are used. The motor used can also be realized.

  Thus, in the brushless motor of the first example of the second embodiment, the coil portion 10a is provided to face the first permanent magnet 32, and the first permanent magnet 32 is used as the core member 20 of the coil portion 10a. Since the second permanent magnet 15 arranged so that different poles face each other is provided, a current in a predetermined direction can be passed through the electromagnetic coil 12 to generate a force in a predetermined driving direction in the motor. That is, in the brushless motor of the present embodiment, it is possible to operate the brushless motor without switching the driving voltage and driving current by the control circuit.

  FIG. 23 shows the configuration of the rotary brushless motor in the second example of the second embodiment. This motor 110a is provided with a stator including a coil portion 10a on the upper and lower sides of the rotor portion 30 of the motor of the first embodiment shown in FIG. The same as the first embodiment shown in FIG. The motor of the second embodiment can generate a driving force approximately twice that of the motor of the first embodiment.

  FIG. 24 shows the configuration of the rotary brushless motor in the third example of the second embodiment. This motor 110b is obtained by replacing the coil portion 10a of the motor of the first embodiment shown in FIG. 10 with a coil portion 10c shown in FIG. The motor of the third embodiment has a slightly smaller driving force than the motor of the first embodiment, but can be made lighter.

  FIG. 25 shows the configuration of the rotary brushless motor in the fourth example of the second embodiment. The motor 110c has a configuration in which a rotor portion 30 is provided on each of an upper side and a lower side of a stator including the coil portion 10d. The configuration shown in FIG. 18 is adopted as the configuration of the coil portion 10d and the permanent magnet 32. In this motor, an effective driving force can be generated from the upper coil portion and the lower coil portion of the core member 20a. Therefore, the efficiency can be improved as compared with the first embodiment (FIG. 20) and the second embodiment (FIG. 23).

  FIG. 26 shows the configuration of the rotary brushless motor in the fifth example of the second embodiment. The motor 110d has a configuration in which a rotor portion 30 is provided on each of an upper side and a lower side of a stator including the coil portion 10e. The configuration shown in FIG. 19A is adopted as the configuration of the coil portion 10e and the permanent magnet 32. In this motor, an effective driving force can be generated from the upper coil portion and the lower coil portion of the core member 20b. Therefore, the efficiency can be improved as compared with the first embodiment (FIG. 20) and the second embodiment (FIG. 23).

  FIG. 27 shows the configuration of the rotary brushless motor in the sixth example of the second embodiment. In the motor 110e, a rotor portion 30 including a hollow cylindrical permanent magnet 32 and a stator including a coil portion 10a are configured in a concentric cylindrical shape with a rotation shaft 112 as a center. The configuration shown in FIG. 16 is adopted as the configuration of the coil portion 10a and the permanent magnet 32. Such a motor can also generate an effective driving force in accordance with the principle described in FIG.

  FIG. 28 shows the configuration of the rotary brushless motor in the seventh example of the second embodiment. This motor 110f is obtained by omitting the magnetic member 14 from the core member of the motor shown in FIG. The configuration of the coil portion 10b is the same as that shown in FIG. This motor 110f also has substantially the same effect as FIG.

  FIG. 29 shows the configuration of the rotary brushless motor in the eighth example of the second embodiment. This motor 110g is obtained by replacing the permanent magnet 15 of the core member of the motor shown in FIG. 28 with a non-magnetic member 20a. The configuration of the coil portion 10c is the same as that shown in FIG. In this motor 110g, a negative driving force (a driving force opposite to the driving direction of the motor) is generated from the coil portion on the opposite side of the magnet 32, so the net driving force is reduced, but the motor is lightened. Is possible.

  FIG. 30 shows the configuration of the rotary brushless motor in the ninth example of the second embodiment. In this motor 110h, the rotor portion 30 of the eighth embodiment shown in FIG. 29 is changed to a double cylindrical structure, and a permanent magnet 32 is also provided inside the stator. The configuration of the coil portion 10e is the same as that shown in FIG. With this configuration, an effective driving force can be generated from both sides of the coil, and an efficient motor can be obtained.

  FIG. 31 shows the configuration of a linear motor as a tenth example of the second embodiment. The linear motor 1000a includes a fixed guide portion 1100 and a moving portion 1200. As shown in FIG. 31A, a plate-like permanent magnet 32 extending in the moving direction is provided at the center of the fixed guide portion 1100. The moving part 1200 is configured to sandwich the fixed guide part 1100 in the vertical direction, and the coil part 10a is provided above and below the permanent magnet 32 so as to face each other. The configuration shown in FIG. 16 is adopted as the configuration of the coil portion 10a and the permanent magnet 32. As shown in FIG. 31B, the moving unit 1200 is provided with a drive control unit 1250. The drive controller 1250 has a self-supporting power supply device (not shown) such as a fuel cell. The fixed guide portion 1100 is provided with a rail 1120 for guiding the moving portion 1200. The moving part 1200 is slidably held on the rail 1120 by a bearing part 1140. The brushless motor according to the present invention can also be realized as such a linear motor.

  FIG. 32 shows a configuration of a linear motor as an eleventh example of the second embodiment. The linear motor 1010a is different from the sixth embodiment shown in FIG. 31 in the configuration of the fixed guide portion 1100. That is, in the eleventh embodiment, two permanent magnets 32 are provided in the center of the fixed guide portion 1100 with the magnetic yoke member 34 interposed therebetween. The magnetization directions of these two magnets 32 may be the same or opposite. Further, the permanent magnet 32 and the magnetic yoke member 34 are provided at positions outside the moving portion 1200 on both sides of the fixed guide portion 1100. The configuration shown in FIG. 19A is adopted as the configuration of the coil portion 10e and the permanent magnet 32. In the seventh embodiment, by providing a plurality of permanent magnets 32, the upper and lower coil portions of the two coil portions 10e (the upper coil portion 12u and the lower coil portion 12d described in FIG. 18B) are arranged. Each can be used effectively.

  FIG. 33 shows the configuration of a linear motor as a twelfth example of the second embodiment. The linear motor 2000a includes a fixed guide portion 2100 and a moving portion 2200. As shown in FIG. 33A, a coil portion 10e extending in the moving direction is provided at the center of the moving portion 2200. The coil portion 10e is the same as that shown in FIG. The fixed guide portion 2100 is configured to sandwich the moving portion 2200 in the vertical direction, and two permanent magnets 32 are provided to face each other. As shown in FIG. 33B, the moving unit 2200 is provided with a drive control unit 2250. The drive control unit 2250 has a self-supporting power supply device (not shown) such as a fuel cell. The fixed guide portion 2100 is provided with a rail 2120 for guiding the moving portion 2200. The moving part 2200 is slidably held on the rail 2120 by a bearing part 2140. This linear motor is in a reverse relationship to the tenth embodiment shown in FIG. 31 in that a permanent magnet is used for the fixed guide portion and an electromagnetic coil is used for the moving portion. As can be understood from the various examples described above, the brushless motor according to the second embodiment of the present invention adopts various mechanical structures while adopting the configuration of the coil portion shown in FIGS. Can be realized.

  As can be understood from the various examples described above, the brushless motor according to the various examples of the second embodiment of the present invention is the first member provided with the first permanent magnet ("first driving member"). And a second member provided with an electromagnetic coil (also referred to as a “second driving member”), and the first and second driving members can be moved relative to each other. It can be realized as various brushless motors. In the case of a rotary motor, for example, the first drive member is a rotor and the second drive member is a stator.

C. Variation:
The present invention is not limited to the above-described examples and embodiments, and can be implemented in various modes without departing from the gist thereof. For example, the following modifications are possible.

C1. Modification 1:
FIGS. 34A and 34B are explanatory views showing a modification of the configuration shown in FIG. In the example of FIG. 34A, slits 36 are provided at positions where the upper surface and the lower surface of the magnet 32 face each other. In the example of FIG. 34 (B), the slit 36 on the upper surface and the slit 36 on the lower surface of the magnet 32 are provided at positions shifted by ½ of the pitch between adjacent slits.

  FIGS. 35A to 35C are explanatory diagrams illustrating an arrangement example of the slits 36 of the magnet 32. In the example of FIG. 35A, the slit 36 is provided along a direction orthogonal to the drive direction DD. In the example of FIGS. 35B and 35C, the slit 36 is provided along a direction inclined from both the drive direction DD and the direction orthogonal to the drive direction DD. As can be understood from these examples, the slit 36 is preferably provided along a direction intersecting the motor driving direction DD. The reason is as follows. In general, it is known that an infinite plate magnet magnetized in the thickness direction has a magnetic flux density of zero. A similar phenomenon can occur even with a sufficiently large plate magnet. Therefore, if the slits 36 are provided in the surface of the plate magnet in the permanent magnet 32, the magnetic flux density can be increased, and as a result, the driving force can be increased.

  36 (A) to 36 (C) are explanatory diagrams showing examples of arrangement of slits in the ring-shaped magnet. These ring magnets are applied to a disk-shaped rotary motor as shown in FIG. 3, for example. In FIG. 36A, the slit 36 is provided along a direction orthogonal to the driving direction DD. In the example of FIGS. 36B and 36C, the slit 36 is provided along a direction inclined from both the drive direction DD and the direction orthogonal to the drive direction DD.

  FIGS. 37A and 37B are explanatory views showing a modification of the configuration shown in FIG. In these examples, a slit 36 is provided on the surface of the permanent magnet 32. In these examples, the slit 18 is also provided on the surface of the permanent magnet 32 constituting the core member 20. The two types of slits 36 and 18 may be provided at positions facing each other as shown in FIG. 37 (A), or may be shifted from each other by ½ of the slit pitch as shown in FIG. 37 (B). good.

  FIG. 38 is an explanatory diagram showing a modified example of the configuration shown in FIG. Also in these examples, the slit 36 is provided on the surface of the permanent magnet 32. Further, the slit 36 of the first permanent magnet 32u and the slit 36 of the second permanent magnet 32d may be provided at positions facing each other or may be provided at positions shifted from each other.

  34 to 38, the permanent magnet is provided with the slit, but the permanent magnet may be separated at the position of the slit. In this case, it can be understood that a plurality of small permanent magnets are arranged with a gap. It can be understood that the gap in this case and the slits in FIGS. 34 to 38 correspond to “concave portions” provided in the permanent magnet. It should be noted that substantially the same effect can be achieved even if a convex portion is provided on the permanent magnet instead of the concave portion. A permanent magnet having a concave portion or a convex portion provided along a direction intersecting the driving direction can be produced by various methods. For example, preparing a permanent magnet as described above by preparing an unmagnetized ferromagnetic member having the same shape as the final magnet shape and magnetizing the ferromagnetic member with a magnetizing device. Can do.

C2. Modification 2:
In the above embodiment, a DC drive voltage is applied to the electromagnetic coil, but a pulsed voltage may be applied to the electromagnetic coil as the drive voltage. That is, the motor can be operated in a predetermined driving direction by applying a voltage having a predetermined polarity to the electromagnetic coil without changing the polarity of the driving voltage. From the viewpoint of the drive current, it can be understood that the motor can be operated in a predetermined drive direction by applying a drive current in a predetermined direction to the electromagnetic coil without changing the direction of the drive current. However, if a constant DC voltage or DC current is continuously applied to the coil instead of the pulsed voltage or current, there is an advantage that the configuration of the drive control circuit becomes easier.

C3. Modification 3:
In the above-described embodiments, specific examples of the mechanical configuration and circuit configuration of the brushless motor have been described. However, any other configuration can be adopted as the mechanical configuration and circuit configuration of the brushless motor of the present invention. is there.

C4. Modification 4:
The present invention can be applied to motors of various devices such as a fan motor, a timepiece (hand drive), a drum-type washing machine (single rotation), a roller coaster, and a vibration motor. When the present invention is applied to a fan motor, the various effects described above (low power consumption, low vibration, low noise, low rotation unevenness, low heat generation, long life) are particularly remarkable. Such fan motors are, for example, various devices such as digital display devices, in-vehicle devices, fuel cell computers, fuel cell digital cameras, fuel cell video cameras, fuel cell mobile phones, and other fuel cell equipment. It can be used as a fan motor for the device. The motor of the present invention can also be used as a motor for various home appliances and electronic devices. For example, the motor according to the present invention can be used as a spindle motor in an optical storage device, a magnetic storage device, a polygon mirror driving device, or the like.

  FIG. 39 is an explanatory diagram showing a projector using a motor according to an embodiment of the present invention. The projector 600 includes three light sources 610R, 610G, and 610B that emit light of three colors, red, green, and blue, and three liquid crystal light valves 640R, 640G, and 640B that modulate these three colors of light, respectively. A cross dichroic prism 650 that synthesizes the modulated three-color light, a projection lens system 660 that projects the combined three-color light onto the screen SC, a cooling fan 670 that cools the inside of the projector, and a projector 600 And a control unit 680 for controlling the whole. As the motor for driving the cooling fan 670, the various brushless motors described above can be used.

  40A to 40C are explanatory views showing a fuel cell type mobile phone using a motor according to an embodiment of the present invention. FIG. 40A shows the appearance of the mobile phone 700, and FIG. 40B shows an example of the internal configuration. The mobile phone 700 includes an MPU 710 that controls the operation of the mobile phone 700, a fan 720, and a fuel cell 730. The fuel cell 730 supplies power to the MPU 710 and the fan 720. The fan 720 is used to supply air to the fuel cell 730 from the outside to the inside of the mobile phone 700 or to discharge moisture generated by the fuel cell 730 from the inside of the mobile phone 700 to the outside. It is. Note that the fan 720 may be disposed on the MPU 710 as shown in FIG. 40C to cool the MPU 710. As the motor for driving the fan 720, the various brushless motors described above can be used.

It is a figure which shows schematic structure of the permanent magnet and coil part of the motor in an Example. It is a figure which shows the modification of a permanent magnet. It is sectional drawing which shows the structure of the rotary motor as 1st Example of 1st Embodiment. It is a figure which shows the example of the specific shape of a magnetic flux shielding member and an electromagnetic coil. It is a figure which shows the example of the other shape of a magnetic flux shielding member and an electromagnetic coil. It is a block diagram which shows the structure of the drive control circuit of a brushless motor. It is a circuit diagram which shows the structure of a drive driver part. 3 is a circuit diagram showing an internal configuration of a regeneration control unit 220. FIG. It is sectional drawing which shows the structure of the rotary motor in 2nd Example of 1st Embodiment. It is sectional drawing which shows the structure of the rotary motor in 3rd Example of 1st Embodiment. It is sectional drawing which shows the structure of the rotary motor in 4th Example of 1st Embodiment. It is sectional drawing which shows the structure of the rotary motor in 5th Example of 1st Embodiment. It is sectional drawing which shows the structure of the linear motor in 6th Example of 1st Embodiment. It is sectional drawing which shows the structure of the linear motor in 7th Example of 1st Embodiment. It is sectional drawing which shows the structure of the linear motor in 8th Example of 1st Embodiment. It is a figure which shows the 1st structural example of the permanent magnet and coil part of the motor in 2nd Embodiment. It is explanatory drawing which shows the modification of the core member in the 1st structural example of 2nd Embodiment shown in FIG. It is a figure which shows the 2nd structural example of the permanent magnet and coil part of the motor in 2nd Embodiment. It is explanatory drawing which shows the modification of the core member in the 2nd structural example shown in FIG. It is sectional drawing which shows the structure of the rotary motor as 1st Example of 2nd Embodiment. It is a figure which shows the example of the specific shape of a coil part. It is a figure which shows the example of the other shape of a coil part. It is sectional drawing which shows the structure of the rotary motor in 2nd Example of 2nd Embodiment. It is sectional drawing which shows the structure of the rotary motor in 3rd Example of 2nd Embodiment. It is sectional drawing which shows the structure of the rotary motor in 4th Example of 2nd Embodiment. It is sectional drawing which shows the structure of the rotary motor in 5th Example of 2nd Embodiment. It is sectional drawing which shows the structure of the rotary motor in 6th Example of 2nd Embodiment. It is sectional drawing which shows the structure of the rotary motor in 7th Example of 2nd Embodiment. It is sectional drawing which shows the structure of the rotary motor in 8th Example of 2nd Embodiment. It is sectional drawing which shows the structure of the rotary motor in 9th Example of 2nd Embodiment. It is sectional drawing which shows the structure of the linear motor in 10th Example of 2nd Embodiment. It is sectional drawing which shows the structure of the linear motor in 11th Example of 2nd Embodiment. It is sectional drawing which shows the structure of the linear motor in 12th Example of 2nd Embodiment. It is explanatory drawing which shows the modification of the structure shown to FIG. 1 (B). It is explanatory drawing which shows the example of arrangement | positioning of the slit of a magnet. It is explanatory drawing which shows the example of arrangement | positioning of the slit of a ring-shaped magnet. It is explanatory drawing which shows the modification of the structure shown to FIG. 16 (B). It is explanatory drawing which shows the modification of the structure shown in FIG.18 (B). It is explanatory drawing which shows the projector using the motor by the Example of this invention. It is explanatory drawing which shows the fuel cell type mobile telephone using the motor by the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Coil part 12 ... Electromagnetic coil 12i ... Inner coil part 12o ... Outer coil part 14 ... Magnetic flux shielding member (magnetic body member)
14c ... Connecting member 14s ... Split part 15 ... Permanent magnet 16 ... Circuit board 18 ... Slit 20 ... Core member 30 ... Rotor part 32 ... Permanent magnet 32d ... Trapezoid part 34 ... Magnetic yoke member 36 ... Slit 100, 110 ... Brushless motor 102 ... Case 112 ... Rotating shaft 114 ... Bearing part 200 ... Drive signal generation part 210 ... Drive driver part 220 ... Regeneration control part 222 ... Rectification circuit 224 ... Switching transistor 230 ... Capacitor 240 ... Power storage control part 300 ... CPU system 600 ... Projector 610R , 610G, 610B ... Light source 640R, 640G, 640B ... Liquid crystal light valve 650 ... Cross dichroic prism 660 ... Projection lens system 670 ... Cooling fan 680 ... Control unit 700 ... Mobile phone 710 ... MPU
720 ... Fan 730 ... Fuel cell 1000 ... Linear motor 1010 ... Linear motor 1100 ... Fixed guide part 1120 ... Rail 1140 ... Bearing part 1200 ... Moving part 1250 ... Drive control part 2000 ... Linear motor 2100 ... Fixed guide part 2120 ... Rail 2140 ... Bearing unit 2200 ... Moving unit 2250 ... Drive control unit

Claims (16)

A brushless motor operable in a predetermined driving direction,
A first driving member including a first permanent magnet magnetized in a direction perpendicular to the driving direction;
A second drive member including an electromagnetic coil provided opposite to the first drive member and wound around a direction parallel to the drive direction;
A drive control circuit for supplying power to the electromagnetic coil;
With
The drive control circuit operates the brushless motor in the drive direction by supplying a drive current in a predetermined first current direction to the electromagnetic coil without changing the direction of the current supplied to the electromagnetic coil. Brushless motor. The brushless motor according to claim 1,
The electromagnetic coil is a brushless motor wound around a magnetic flux shielding member with a direction parallel to the driving direction as an axis. The brushless motor according to claim 2,
As the coil part, first and second coil parts are respectively provided on both sides of the first permanent magnet,
Among the electromagnetic coils of the first coil portion, among the electromagnetic coils of the second coil portion, the current flowing through the inner coil portion closer to the first permanent magnet than the magnetic flux shielding member In the brushless motor, the electromagnetic coils are connected so that the current flowing through the inner coil portion closer to the first permanent magnet than the magnetic flux shielding member flows in directions parallel to each other. The brushless motor according to claim 1, further comprising:
A driving force generation preventing member for preventing generation of driving force due to electromagnetic interaction between a part of the electromagnetic coil and the first permanent magnet;
The electromagnetic coil has a first coil portion on the side facing the first permanent magnet, and a second coil portion on the side opposite to the first coil portion,
The drive force generation preventing member allows generation of electromagnetic interaction between the first coil portion and the first permanent magnet, and between the second coil portion and the first permanent magnet. Brushless motor that prevents electromagnetic interaction between the two. The brushless motor according to claim 4,
The driving force generation preventing member is a second permanent magnet provided on the opposite side of the first permanent magnet across the second driving member,
The brushless motor, wherein the second permanent magnet is installed such that the same pole as the first permanent magnet faces each other. The brushless motor according to claim 5,
The brushless motor, wherein the electromagnetic coil is an air-core coil or a coil having a core material made of a non-magnetic material. The brushless motor according to claim 5,
The electromagnetic coil includes, as a core material, a magnet assembly composed of two permanent magnets that are attracted to the magnetic body member with the same poles facing each other across the magnetic body member,
The brushless motor, wherein the two permanent magnets of the magnet assembly are arranged such that different poles face each other of the first and second permanent magnets. The brushless motor according to claim 4,
The driving force generation preventing member includes a second permanent magnet provided as a core material of the electromagnetic coil,
The brushless motor, wherein the second permanent magnet is installed such that poles different from the first permanent magnet face each other. The brushless motor according to any one of claims 1 to 8,
The first permanent magnet is a brushless motor that is a plate-like magnet having a thickness along a magnetization direction of the first permanent magnet. The brushless motor according to any one of claims 1 to 9,
The drive control circuit supplies the drive current to the electromagnetic coil in a direction opposite to the first current direction, thereby operating the brushless motor in a direction opposite to the drive direction. The brushless motor according to any one of claims 1 to 10,
The first permanent magnet is a brushless motor having a concave portion or a convex portion provided along a direction intersecting with the driving direction. The brushless motor according to any one of claims 1 to 11,
The brushless motor is a rotary motor, and the driving direction is a rotation direction. The brushless motor according to any one of claims 1 to 11,
The brushless motor is a rectilinear motor, and the driving direction is a rectilinear direction. Electronic equipment,
A brushless motor operable in a predetermined driving direction;
A driven member driven by the brushless motor;
With
The brushless motor is
A first drive member including a first permanent magnet magnetized in a direction perpendicular to the drive direction;
A second drive member including an electromagnetic coil provided opposite to the first drive member and wound around a direction parallel to the drive direction;
A drive control circuit for supplying power to the electromagnetic coil;
With
The drive control circuit operates the brushless motor in the drive direction by supplying a drive current in a predetermined first current direction to the electromagnetic coil without changing the direction of the current supplied to the electromagnetic coil. ,Electronics. The electronic device according to claim 14,
The electronic device is an electronic device, which is a projector. Fuel cell equipment,
A brushless motor operable in a predetermined driving direction;
A driven member driven by the brushless motor;
A fuel cell for supplying power to the brushless motor;
With
The brushless motor is
A first drive member including a first permanent magnet magnetized in a direction perpendicular to the drive direction;
A second drive member including an electromagnetic coil provided opposite to the first drive member and wound around a direction parallel to the drive direction;
A drive control circuit for supplying power to the electromagnetic coil;
With
The drive control circuit operates the brushless motor in the drive direction by supplying a drive current in a predetermined first current direction to the electromagnetic coil without changing the direction of the current supplied to the electromagnetic coil. , Fuel cell equipment.

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