JP2020005441A - Driving motor and electric vehicle - Google Patents

Abstract

A driving motor that can change a relative position between a rotor and a stator in a rotation axis direction of the rotor and can reduce manufacturing cost, and an electric vehicle including the driving motor. A driving motor according to the present invention is a driving motor for generating a driving force for rotating wheels of an electric vehicle, wherein the rotor rotates about a rotating shaft, a stator, the rotor and the stator. A moving device for moving the inner peripheral part, which is the one arranged on the inner peripheral side, in the direction of the rotation axis, wherein the moving device rotates at least a part of the members together with the rotor, An inertial force acting portion on which an inertial force acts by rotation is provided, and the inner peripheral part is configured to move in the rotation axis direction by the inertial force. [Selection] Figure 2

Description

  The present invention relates to a driving motor for generating a driving force for rotating wheels of an electric vehicle, and an electric vehicle including the driving motor.

  In recent years, an electric vehicle provided with an electric motor as a driving source for rotating wheels has been proposed. Various proposals have been made for a driving motor for generating a driving force for rotating wheels of an electric vehicle in order to reduce a back electromotive force generated when a rotor rotates at a high speed. For example, in the drive motor described in Patent Document 1, the relative position between the rotor and the stator can be changed by moving the stator in the rotation axis direction of the rotor, and the facing area between the magnet of the rotor and the coil of the stator can be reduced. It has a configuration that can be changed. By configuring the driving motor in this way, the back electromotive force can be reduced by reducing the facing area between the magnet of the rotor and the coil of the stator when rotating the rotor at high speed.

JP-A-2002-300760

  The driving motor described in Patent Literature 1 requires an actuator that moves the stator in the rotation axis direction of the rotor. An actuator is a drive device using a hydraulic or electric motor. For this reason, the drive motor described in Patent Literature 1 requires a dedicated actuator for moving the stator in the direction of the rotation axis of the rotor, and has a problem that the manufacturing cost is increased.

  The present invention has been made in view of the above problems, and has a drive motor that can change a relative position between a rotor and a stator in a rotation axis direction of the rotor and can suppress a manufacturing cost. An object is to obtain an electric vehicle including an electric motor.

  A driving motor according to the present invention is a driving motor that generates a driving force for rotating wheels of an electric vehicle, and includes a rotor that rotates around a rotation axis, a stator, and an inner rotor among the rotor and the stator. A moving device for moving an inner peripheral component, which is disposed on the circumferential side, in the direction of the rotation axis, wherein the moving device is configured such that at least a part of the member rotates together with the rotor, and an inertial force is generated by the rotation. The inner peripheral part moves in the rotation axis direction by the inertial force.

  Further, an electric vehicle according to the present invention includes the driving electric motor according to the present invention, and wheels that are rotated by the driving force of the driving electric motor.

  The drive motor according to the present invention changes the relative position between the rotor and the stator in the rotation axis direction of the rotor by using inertial force generated by rotation of the rotor. Therefore, the drive motor according to the present invention does not require a dedicated actuator for moving the rotor or the stator in the rotation axis direction of the rotor. Therefore, the driving motor according to the present invention can change the relative position between the rotor and the stator in the rotation axis direction of the rotor, and can suppress an increase in manufacturing cost.

FIG. 1 is a diagram illustrating a schematic configuration of an electric motorcycle according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view illustrating a schematic configuration of a rear wheel of the electric motorcycle according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view illustrating a schematic configuration of a rear wheel of the electric motorcycle according to Embodiment 1 of the present invention. FIG. 3 is a diagram illustrating a first member and a moving body of the moving device of the driving motor according to the first embodiment of the present invention when observed from a Z direction illustrated in FIG. 2. FIG. 2 is a cross-sectional view illustrating a schematic configuration of a rear wheel in another example of the electric motorcycle according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view illustrating a schematic configuration of a rear wheel in another example of the electric motorcycle according to Embodiment 1 of the present invention. FIG. 4 is a diagram illustrating a first member and a moving body of a moving device in another example of the driving motor according to Embodiment 1 of the present invention. FIG. 7 is a diagram illustrating a schematic configuration of an electric motorcycle according to Embodiment 2 of the present invention. FIG. 7 is a cross-sectional view illustrating a schematic configuration of a driving motor according to a second embodiment of the present invention. FIG. 7 is a cross-sectional view illustrating a schematic configuration of a driving motor according to a second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate.

  In the following, a case where the present invention is applied to an electric motorcycle will be described. However, the present invention may be applied to an electric vehicle other than the electric motorcycle (for example, an electric three-wheeled vehicle, an electric four-wheeled vehicle, etc.). In addition, the electric vehicle includes an electric bicycle. An electric bicycle is a vehicle that includes a drive motor that drives wheels and that can be propelled on the road by a pedaling force applied to a pedal.

  The configuration, operation, and the like described below are examples of the present invention, and the present invention is not limited to such a configuration, operation, and the like.

  In addition, in each of the drawings, the same or corresponding members or portions are denoted by the same reference numerals, or the reference numerals are omitted. In addition, in each of the drawings, illustration of a detailed portion is appropriately simplified or omitted.

Embodiment 1 FIG.
<Structure of electric motorcycle>
An electric motorcycle 200 according to Embodiment 1 will be described.

FIG. 1 is a diagram showing a schematic configuration of an electric motorcycle according to Embodiment 1 of the present invention.
The electric motorcycle 200 includes a vehicle body 201, a front wheel 210 rotatably connected to the vehicle body 201 via a front fork 202, and a rear wheel 220 rotatably connected to the vehicle body 201 via a swing arm 203. .

  Further, the electric motorcycle 200 generates a driving force for rotating the accelerator lever 204 attached to the vehicle body 201, the control device 230 incorporated in the vehicle body 201, the battery 240 incorporated in the vehicle body 201, and the rear wheel 220. A driving motor 1.

  The control device 230 may be configured to include, for example, a microcomputer, a microprocessor unit, and the like, may be configured to include an updatable device such as firmware, and may be configured to be executed by a command from a CPU or the like. May be configured to include a program module or the like. The control device 230 controls the rotation speed of the driving motor 1 by supplying a current corresponding to the accelerator opening input from the driver via the accelerator lever 204 from the battery 240 to the driving motor 1. ing.

<Configuration of drive motor>
Next, the configuration of the driving motor 1 according to the first embodiment will be described.

  2 and 3 are cross-sectional views illustrating a schematic configuration of a rear wheel of the electric motorcycle according to Embodiment 1 of the present invention. FIG. 4 is a view of the first member and the moving body of the moving device for the driving electric motor according to Embodiment 1 of the present invention when viewed from the Z direction shown in FIG. 2 and 3 are drawings in which the rear wheel 220 is cut along an imaginary plane that passes through the rotation axis 11 of the rotor 10 and is parallel to the rotation axis 11. Here, FIG. 3 shows that the stator 20 moves in the direction of the rotation axis 11 of the rotor 10 from the state of FIG. 2, and the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 becomes smaller than that of FIG. It shows the state that it is. Note that the direction of the rotation shaft 11 of the rotor 10 is a direction in which the rotation shaft 11 extends, and in FIGS. Further, the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 is an area in a range where the magnet 12 of the rotor 10 and the coil 21 of the stator 20 face each other.

  The drive motor 1 includes a stator 20 and a rotor 10 that rotates with respect to the stator 20 about a rotation shaft 11. In the first embodiment, the driving motor 1 includes the shaft 30 that is arranged coaxially with the rotating shaft 11. The shaft 30 is fixed to the swing arm 203.

  The rotor 10 has, for example, a hollow cylindrical shape with both ends closed. The rotor 10 also functions as a rim of the rear wheel 220. The rotor 10 is attached to a shaft 30 so as to be rotatable about a rotation shaft 11. In the first embodiment, the rotor 10 is rotatably attached to the shaft 30 via a radial bearing 41 and a radial bearing 42 provided on the shaft 30. Further, a tire 221 is connected to the annular outer peripheral surface of the rotor 10. In other words, the rotor 10 is connected to the tire 221. Therefore, when the driving motor 1 is driven, the tire 221 rotates together with the rotor 10. Further, the rotor 10 has a plurality of magnets 12 arranged on the inner peripheral surface in a ring shape along the circumferential direction of the rear wheel 220. Note that the rotor 10 does not need to be directly connected to the tire 221, and may be connected to the tire 221 via another component as long as the rotor 10 can rotate with the tire 221.

  The stator 20 is provided around the shaft 30 and is housed in the internal space of the rotor 10. The stator 20 has a plurality of coils 21 arranged on the outer peripheral surface in an annular shape along the circumferential direction of the rear wheel 220. The plurality of coils 21 are arranged on the inner peripheral side of the plurality of magnets 12 arranged in a ring shape, and face the plurality of magnets 12. That is, the driving motor 1 is an outer rotor type motor in which the rotor 10 is provided outside the stator 20.

  Further, as described above, the rotor 10 is disposed on the inner peripheral side of the tire 221 of the rear wheel 220 and is connected to the tire 221. Then, the rotor 10 and the tire 221 rotate together. That is, the drive motor 1 is an in-wheel motor. In the following, one of the rotor 10 and the stator 20 arranged on the inner peripheral side may be referred to as an inner peripheral component 2 in some cases. That is, in the first embodiment, the stator 20 is the inner peripheral component 2.

  The stator 20, which is the inner peripheral component 2, is connected to the shaft 30 so as not to rotate with respect to the shaft 30 but to be movable in the direction of the rotation shaft 11. In the first embodiment, the stator 20 is connected to the shaft 30 via the spline bearing 43.

  Here, the driving motor 1 according to the first embodiment includes a moving device 100 as a mechanism for moving the stator 20 in the direction of the rotation shaft 11. The moving device 100 includes an inertial force acting section 110 and a spring 101.

  At least a part of the inertial force acting portion 110 rotates together with the rotor 10, and an inertial force acts by the rotation. More specifically, the inertial force acting section 110 includes a first member 111, a second member 112, and a moving body 113. The first member 111 has a substantially disk shape, and the shaft 30 penetrates the center. Further, the first member 111 is directly connected to the rotor 10. That is, the first member 111 rotates together with the rotor 10. The first member 111 may be connected to the rotor 10 via another component as long as the first member 111 can rotate together with the rotor 10. For example, the first member 111 may be attached to the radial bearing 41, and the first member 111 and the rotor 10 may be connected via the radial bearing 41.

  The second member 112 has a substantially disk shape, and the shaft 30 penetrates the center. Further, the second member 112 is arranged to face the first member 111 in the direction of the rotation shaft 11. In the first embodiment, the second member 112 is arranged on the stator 20 side with respect to the first member 111. The second member 112 moves in the direction of the rotating shaft 11 together with the stator 20, and is connected to the stator 20. Specifically, the second member 112 is connected to the spline bearing 43 via a thrust bearing 115 described later. That is, the second member 112 is connected to the stator 20 via the thrust bearing 115 and the spline bearing 43. Note that the thrust bearing 115 may be directly connected to the stator 20, and the second member 112 and the stator 20 may be connected via the thrust bearing 115. As described above, the second member 112 is connected to the spline bearing 43 via the thrust bearing 115. That is, the second member 112 is connected to the spline bearing 43 so as to be rotatable together with the rotor 10 and the first member 111.

  The moving body 113 is disposed between the first member 111 and the second member 112. The moving body 113 is a cylindrical roller. As shown in FIG. 4, the first member 111 is provided with a side wall 111c at a position facing both ends in the central axis direction of the moving body 113 which is a cylindrical roller. Thus, a groove 111b extending in the radial direction from the center of the first member 111 is formed in the first member 111 between the side walls 111c. The moving body 113 is disposed in the groove 111b so as to rotate and move in the radial direction. That is, an accommodation space for the moving body 113 is formed between the side walls 111c. Therefore, when the first member 111 rotates together with the rotor 10, the moving body 113 is pushed by the side wall 111 c forming the groove 111 b and rotates with the first member 111. Then, the moving body 113 moves to the outer peripheral side of the first member 111 by the inertial force acting on the moving body 113 during the rotation. As described above, the shaft 30 arranged coaxially with the rotation shaft 11 penetrates the center of the first member 111. Therefore, the moving body 113 moves in a direction away from the rotating shaft 11 by the inertial force acting on the moving body 113 during rotation.

  Although the number of the grooves 111b and the number of the moving bodies 113 are arbitrary, in the first embodiment, the plurality of grooves 111b are formed in the first member 111, and the moving bodies 113 are arranged in each of the grooves 111b. These grooves 111b are arranged at equal angular intervals. When each moving body 113 rotates and an inertial force acts on each moving body 113, the inertial force is supported by the radial bearing 41 and the radial bearing 42 via the shaft 30. At this time, by disposing the plurality of grooves 111b in which the moving bodies 113 are arranged at equal angular intervals, it is possible to suppress imbalance in the radial load applied to the shaft 30 when each moving body 113 rotates, and The load applied to the radial bearing 41 and the radial bearing 42 when the body 113 rotates can be reduced. That is, for example, an effect that damage to the radial bearing 41 and the radial bearing 42 can be suppressed can be obtained. Alternatively, the radial bearing 41 and the radial bearing 42 can be reduced in size and weight, and the driving motor 1 can be reduced in size and weight.

  Further, in the first embodiment, the groove 111b, which is the accommodation space for the moving body 113, is formed in the first member 111. However, in the case where the second member 112 rotates together with the rotor 10 as in the first embodiment, An accommodation space for the moving body 113 may be formed in the second member 112. The moving body 113 may be other than a cylindrical roller as long as the moving body 113 can move in a direction away from the rotating shaft 11 by an inertial force acting on the moving body 113 during rotation. For example, a sphere can be used as the moving body 113. Further, for example, oil may be used as the moving body 113 as long as the airtightness between the first member 111 and the second member 112 is maintained.

  The spring 101 applies a force to the inner peripheral component 2 in a direction in which the first member 111 and the second member 112 approach each other. As described above, in the first embodiment, the stator 20 is the inner peripheral component 2. For this reason, in the first embodiment, the spring 101 applies a force to the stator 20 in a direction in which the first member 111 and the second member 112 approach. More specifically, in the first embodiment, a compression spring is used as the spring 101. One end of the spring 101 is in contact with a flange 31 provided on the shaft 30. Further, the other end of the spring 101 is in contact with the spline bearing 43. As a result, the stator 20 and the spline bearing 43 are pressed in a direction in which the first member 111 and the second member 112 approach. Note that the spring 101 is not limited to a compression spring. For example, various springs can be used as the spring 101 as long as a force can be applied to the stator 20 in a direction in which the first member 111 and the second member 112 approach each other, such as a disc spring and a tension spring.

  When the stator 20 is pressed by the spring 101, the stator 20 and the second member 112 connected to the stator 20 tend to approach the first member 111 in the direction of the rotation shaft 11. Then, as shown in FIG. 2, when the moving body 113 is sandwiched between the first member 111 and the second member 112 in a state where the rotor 10 is not rotating, the rotating shaft 11 of the stator 20 is rotated. Movement in the direction stops. The position of the stator 20 shown in FIG. 2 is a state where the first member 111 and the second member 112 are closest to each other, and a state where the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 is the largest. . Note that a stopper (not shown) may be provided so that the first member 111 and the second member 112 do not come further closer from this state. In the case where such a stopper is provided, the moving body 113 does not have to be sandwiched between the first member 111 and the second member 112 in the state shown in FIG.

  Here, as shown in FIGS. 2 and 3, the first member 111 has an inclined portion 111 a that approaches the second member 112 as the distance from the rotation shaft 11 increases. In addition, the second member 112 includes an inclined portion 112a that approaches the first member 111 as the distance from the rotation shaft 11 increases. For this reason, as can be seen from FIGS. 2 and 3, when the moving body 113 is sandwiched between the first member 111 and the second member 112, as the moving body 113 moves away from the rotation shaft 11, Then, the first member 111 and the second member 112 are separated. That is, as the moving body 113 moves away from the rotating shaft 11, the position of the stator 20 connected to the second member 112 shifts from the state of FIG. 2 in the direction of the rotating shaft 11, and the magnet 12 of the rotor 10 and the coil 21 of the stator 20 move. And the area facing the surface becomes smaller.

  Therefore, when the rotor 10 rotates, the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 changes as follows. Specifically, when the moving body 113 rotates together with the rotor 10, the moving body 113 tends to move in a direction away from the rotation shaft 11 due to an inertial force. That is, the moving body 113 pushes and expands the space between the first member 111 and the second member 112, and moves the second member 112 and the stator 20 in the direction of the rotation shaft 11 and in the direction of contracting the spring 101. . At this time, when the moving body 113 pushes the second member 112 and the stator 20 in the direction of the rotating shaft 11 (the direction from left to right in FIGS. 2 and 3), the spring 101 rotates the second member 112 and the stator 20. The second member 112 and the stator 20 stop at a position where the pressing force in the direction of the shaft 11 (the direction from right to left in FIGS. 2 and 3) is balanced.

  That is, as the rotation speed of the rotor 10 and the moving body 113 increases, the inertial force acting on the moving body 113 increases. For this reason, as the rotation speeds of the rotor 10 and the moving body 113 increase, the force by which the moving body 113 pushes the space between the first member 111 and the second member 112 increases. Therefore, as the rotation speed of the rotor 10 and the moving body 113 increases, the amount of displacement of the stator 20 in the direction of the rotation axis 11 from the state of FIG. 2 increases, and the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 increases. Becomes smaller.

<Operation of drive motor>
Next, the operation of the driving motor 1 according to the first embodiment will be described.
When the driver operates the accelerator lever 204, the control device 230 supplies a current corresponding to the accelerator opening from the battery 240 to the drive motor 1. Thereby, the rotor 10 of the driving motor 1 rotates.

  When the rotor 10 rotates, the first member 111, the second member 112, and the moving body 113 rotate together with the rotor 10. As a result, an inertial force acts on the moving body 113, and the moving body 113 spreads between the first member 111 and the second member 112 due to the inertial force, and attempts to move in a direction away from the rotation shaft 11. When the moving body 113 pushes the second member 112 and the stator 20 in the direction of the rotating shaft 11 (the direction from left to right in FIGS. 2 and 3), the spring 101 pushes the second member 112 and the stator 20 to the rotating shaft. The second member 112 and the stator 20 stop at a position where the pressing force in the eleven directions (the direction from right to left in FIGS. 2 and 3) is balanced. At this time, the inertia force acting on the moving body 113 increases as the rotation speeds of the rotor 10 and the moving body 113 increase. For this reason, as the rotation speed of the rotor 10 and the moving body 113 increases, the amount of displacement of the stator 20 in the direction of the rotation shaft 11 from the state of FIG. 2 increases, and the opposition between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 increases. The area becomes smaller.

<Effect>
The driving motor 1 according to the first embodiment includes a rotor 10 that rotates around a rotation shaft 11, a stator 20, and a moving device 100 that moves the stator 20, which is the inner peripheral component 2, in the direction of the rotation shaft 11. , Is provided. The moving device 100 includes an inertial force acting section 110 in which at least a part of the member rotates together with the rotor 10 and an inertial force acts by the rotation. Then, the stator 20 as the inner peripheral part 2 moves in the direction of the rotating shaft 11 due to the inertial force acting on the inertial force acting portion 110.

  The driving motor 1 according to the first embodiment changes the relative position between the rotor 10 and the stator 20 in the direction of the rotation shaft 11 using the inertial force generated by the rotation of the rotor 10. For this reason, the driving motor 1 according to the first embodiment does not require a dedicated actuator for moving the rotor 10 or the stator 20 in the direction of the rotating shaft 11. Therefore, the drive motor 1 according to the first embodiment can change the relative position between the rotor 10 and the stator 20 in the direction of the rotation shaft 11 and can suppress the manufacturing cost.

  In addition, the driving motor 1 according to the first embodiment does not require a dedicated actuator for moving the rotor 10 or the stator 20 in the direction of the rotation shaft 11, so that the driving motor 1 can be downsized. can get. By reducing the size, it becomes easy to arrange the driving motor 1 on the inner peripheral side of the tire 221. Further, it becomes easy to dispose the driving motor 1 in an electric vehicle having a small body.

<Modification>
5 and 6 are cross-sectional views illustrating a schematic configuration of rear wheels in another example of the electric motorcycle according to Embodiment 1 of the present invention. FIGS. 5 and 6 show the rear wheel 220 cut along an imaginary plane that passes through the rotation axis 11 and is parallel to the rotation axis 11. Here, FIG. 6 shows that the stator 20 moves in the direction of the rotation axis 11 of the rotor 10 from the state of FIG. 5, and the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 becomes smaller than the state of FIG. It shows the state that it is.

  The driving motor 1 shown in FIGS. 5 and 6 uses a sphere as the moving body 113 of the inertial force acting unit 110 of the moving device 100. The thrust bearing 115 is not provided in the driving electric motor 1 shown in FIGS. That is, the second member 112 does not rotate with respect to the stator 20.

  FIGS. 2 to 4 show a cylindrical roller as an example of the moving body 113. When the cylindrical roller relatively moves with respect to the first member 111 and the second member 112 in a direction away from the rotation shaft 11 and in a direction approaching the rotation shaft 11, the first member 111 and the second member 112 Can roll on the surface. On the other hand, when the cylindrical roller moves relative to the first member 111 and the second member 112 in the direction of rotation about the rotation shaft 11, the surfaces of the first member 111 and the second member 112 It will slide. For this reason, when the cylindrical roller moves relatively to the first member 111 and the second member 112 in the direction of rotation about the rotation shaft 11, the cylindrical roller and the first member 111 and the second member The frictional resistance between the rotor 10 and the rotor 112 becomes the resistance when the rotor 10 rotates. For this reason, when the cylindrical roller moves relatively to the first member 111 and the second member 112 in the direction of rotation about the rotation shaft 11, the efficiency of the driving motor 1 is reduced.

  Therefore, the driving motor 1 shown in FIGS. 2 to 4 has a configuration in which the cylindrical roller does not move relative to the first member 111 and the second member 112 in the direction of rotation about the rotation shaft 11. In addition, the frictional resistance between the cylindrical roller and the first member 111 and the second member 112 is suppressed, and the reduction in the efficiency of the driving motor 1 is suppressed. More specifically, the first member 111 and the second member 112 can rotate together with the rotor 10. Further, as shown in FIG. 4, the interval between the side walls 111c forming the groove 111b, that is, the width of the groove 111b is slightly larger than the length of the cylindrical roller in the central axis direction. That is, the movement of the cylindrical roller in the groove 111b in the direction of rotation about the rotation shaft 11 was suppressed. Accordingly, the cylindrical roller does not move relative to the first member 111 and the second member 112 in the direction of rotation about the rotation shaft 11.

  On the other hand, when the sphere moves relative to the first member 111 and the second member 112 in the direction of rotation about the rotation axis 11, the surfaces of the first member 111 and the second member 112 Can roll. Therefore, when the sphere moves relative to the first member 111 and the second member 112 in the direction of rotation about the rotation axis 11, friction between the sphere and the first member 111 and the second member 112 Resistance is small. For this reason, even if the sphere moves relative to the first member 111 and the second member 112 in the direction of rotation about the rotation shaft 11, the efficiency of the driving motor 1 is not significantly reduced. Therefore, the driving motor 1 shown in FIGS. 5 and 6 using a ball as the moving body 113 is not provided with the thrust bearing 115. By configuring the driving motor 1 as shown in FIGS. 5 and 6, it is not necessary to provide the thrust bearing 115, and the manufacturing cost of the driving motor 1 can be further reduced.

  When a sphere is used as the moving body 113, as shown in FIG. 7, the distance between the side walls 111c forming the accommodation space of the moving body 113 is not limited, and the sphere is moved in the direction of rotation about the rotation shaft 11. Side walls 111c may be provided so as to be able to move between 111c. In other words, as shown in FIG. 7, the accommodation space of the moving body 113 can be formed so that the sphere can move in the direction of rotation about the rotation shaft 11 in the accommodation space of the moving body 113. Therefore, by using a ball as the moving body 113, the degree of freedom in designing the driving motor 1 is improved. FIG. 7 is a diagram illustrating a first member and a moving body of a moving device in another example of the driving motor according to Embodiment 1 of the present invention. FIG. 7 shows another example of the first member 111 when a sphere is used as the moving body 113, and has the same observation direction as that of FIG. FIG. 7 shows a state in which a sphere as the first member 111 and the moving body 113 rotates together with the rotor 10 and the sphere moves in a direction away from the rotation shaft 11.

  In the first embodiment, a configuration in which the inclined portion 111a of the first member 111 linearly approaches the second member 112 as the distance from the rotation shaft 11 is increased in a virtual plane that passes through the rotation shaft 11 and is parallel to the rotation shaft 11. It was. Similarly, on a virtual plane passing through the rotation axis 11 and parallel to the rotation axis 11, the inclined portion 112 a of the second member 112 linearly approaches the first member 111 as the distance from the rotation axis 11 increases. . However, the shapes of the inclined portions 111a and 112a are not limited to such shapes.

  The position of the stator 20 changes according to the position of the second member 112 when the moving body 113 is sandwiched between the first member 111 and the second member 112. That is, when the moving body 113 is sandwiched between the first member 111 and the second member 112, the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 varies depending on the position of the second member 112. Change. The distance of the moving body 113 from the rotation shaft 11 is a distance according to the number of rotations of the rotor 10. For this reason, if the shapes of the inclined portions 111a and 112a are appropriately determined according to the number of rotations of the rotor 10 and the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 required at that time. Good.

  In the first embodiment, the rear wheels 220 are rotated by the driving force of the driving motor 1. The invention is not limited thereto, and wheels other than the rear wheels 220 may be rotated by the driving force of the driving motor 1. In other words, since the driving motor 1 according to the first embodiment is an in-wheel motor, the driving motor 1 may be incorporated in wheels other than the rear wheel 220.

  The electric vehicle on which the driving motor 1 is mounted is not limited to the electric motorcycle 200. The driving motor 1 may be mounted on an electric vehicle other than the electric motorcycle 200, and the wheels may be rotated by the driving force of the driving motor 1. The electric vehicle other than the electric motorcycle 200 is, for example, an electric tricycle, an electric four-wheeled vehicle, or the like. In addition, the electric vehicle includes an electric bicycle.

Embodiment 2 FIG.
Also in the inner rotor type electric motor, the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 can be changed by using the moving device 100 as described below. Items not described in the second embodiment are the same as those in the first embodiment.

<Structure of electric motorcycle>
An electric motorcycle 200 according to Embodiment 2 will be described.

FIG. 8 is a diagram showing a schematic configuration of an electric motorcycle according to Embodiment 2 of the present invention.
The drive motor 1 according to the second embodiment is an inner rotor type motor in which the rotor 10 is disposed on the inner peripheral side of the stator 20. The drive motor 1 is arranged outside the rear wheel 220. The driving motor 1 and the rear wheel 220 are connected via a transmission component 250 that transmits the driving force of the driving motor 1 to the rear wheel 220.

  More specifically, the drive motor 1 according to the second embodiment includes a chain 251, a gear 252, and a gear 253 as the transmission component 250. The gear 252 meshes with the chain 251. As will be described later, in the driving motor 1 according to the second embodiment, the shaft 30 is an output shaft that rotates together with the rotor 10 and outputs the driving force of the driving motor 1. The gear 252 is fixed to a shaft 30, which is an output shaft. The gear 253 also engages with the chain 251 similarly to the gear 252. The gear 253 is fixed to the rear wheel 220. Thereby, the driving force of the driving motor 1 is transmitted to the rear wheel 220 via the gear 252, the chain 251 and the gear 253, and the rear wheel 220 rotates.

  Note that the chain 251, the gear 252, and the gear 253 are examples of the transmission component 250. The transmitting component 250 is optional as long as the driving force of the driving motor 1 can be transmitted to the rear wheel 220. For example, a pulley fixed to the shaft 30, which is an output shaft, a pulley fixed to the rear wheel 220, and a belt hooked on these pulleys may be the transmission component 250.

<Configuration of drive motor>
Next, the configuration of the driving motor 1 according to the second embodiment will be described.

  9 and 10 are cross-sectional views illustrating a schematic configuration of a driving motor according to Embodiment 2 of the present invention. 9 and 10 are drawings in which the driving motor 1 is cut along a virtual plane that passes through the rotation axis 11 of the rotor 10 and is parallel to the rotation axis 11. Here, FIG. 10 shows a state in which the rotor 10 moves in the direction of the rotation axis 11 from the state of FIG. 9 and the facing area between the magnet 12 of the rotor 10 and the coil 21 of the stator 20 is smaller than the state of FIG. Is shown.

  The driving motor 1 includes a stator 20, a rotor 10 that rotates with respect to the stator 20 about a rotation shaft 11, and a moving device 100. Further, the driving motor 1 includes a shaft 30 arranged coaxially with the rotating shaft 11. The drive motor 1 according to the second embodiment includes a case 3 that houses the rotor 10, the stator 20, and the moving device 100.

  The rotor 10 as the inner peripheral part 2 is connected to the shaft 30 so as not to rotate with respect to the shaft 30 but to be movable in the direction of the rotation shaft 11. In the first embodiment, the rotor 10 is connected to the shaft 30 via the spline bearing 43. The rotor 10 has a plurality of magnets 12 arranged in an annular shape on the outer peripheral surface. The shaft 30 is rotatably supported by radial bearings 41 and 42 provided on the case 3. That is, in the second embodiment, the shaft 30 is an output shaft that rotates together with the rotor 10 and outputs the driving force of the driving motor 1.

  The stator 20 is fixed to the inner surface of the case 3 so as to surround the outer peripheral side of the rotor 10. The stator 20 has a plurality of coils 21 arranged in an annular shape on the inner peripheral surface. The plurality of coils 21 are arranged on the outer peripheral side of the plurality of magnets 12 arranged annularly, and face the plurality of magnets 12.

  In the inertial force acting section 110 of the moving device 100 according to the second embodiment, the first member 111 that rotates together with the rotor 10 is connected to the spline bearing 43. In other words, the first member 111 is connected to the rotor 10 via the spline bearing 43. That is, the first member 111 moves in the direction of the rotating shaft 11 together with the rotor 10 as the inner peripheral part 2. Note that the first member 111 may be directly connected to the rotor 10.

  The second member 112 is disposed on the side opposite to the rotor 10 with respect to the first member 111. The second member 112 is fixed to the shaft 30 that penetrates the center of the second member 112.

<Operation of drive motor>
Next, the operation of the driving motor 1 according to the second embodiment will be described.

  When the rotor 10 rotates, the first member 111, the second member 112, and the moving body 113 rotate together with the rotor 10. As a result, an inertial force acts on the moving body 113, and the moving body 113 spreads between the first member 111 and the second member 112 due to the inertial force, and attempts to move in a direction away from the rotation shaft 11. When the moving body 113 pushes the first member 111 and the rotor 10 in the direction of the rotation axis 11 (the direction from left to right in FIGS. 9 and 10), the spring 101 pushes the first member 111 and the rotor 10 to the rotation axis. The first member 111 and the rotor 10 stop at a position where the pressing force in the eleven directions (the direction from right to left in FIGS. 9 and 10) is balanced. At this time, as the rotational speeds of the rotor 10 and the moving body 113 increase, the inertial force acting on the moving body 113 increases, so that the amount of deviation of the rotor 10 from the state of FIG. The facing area between the ten magnets 12 and the coils 21 of the stator 20 is reduced.

<Effect>
In the drive motor 1 according to the second embodiment, the moving device 100 moves the rotor 10, which is the inner peripheral part 2, in the direction of the rotating shaft 11 by the inertial force acting on the inertial force acting portion 110.

  The driving motor 1 according to the second embodiment uses the inertial force generated by the rotation of the rotor 10 to rotate the rotor 10 and the stator in the direction of the rotation shaft 11 similarly to the driving motor 1 described in the first embodiment. Change the position relative to 20. For this reason, the driving motor 1 according to the second embodiment also has a dedicated actuator for moving the rotor 10 or the stator 20 in the direction of the rotating shaft 11 similarly to the driving motor 1 described in the first embodiment. do not need. Therefore, the driving motor 1 according to the second embodiment can also change the relative position between the rotor 10 and the stator 20 in the direction of the rotation shaft 11 similarly to the driving motor 1 described in the first embodiment, and In addition, manufacturing costs can be reduced.

  Further, the driving motor 1 according to the second embodiment also requires a dedicated actuator for moving the rotor 10 or the stator 20 in the direction of the rotation shaft 11, similarly to the driving motor 1 described in the first embodiment. Therefore, the effect that the driving motor 1 can be downsized can be obtained. By reducing the size, it becomes easy to dispose the driving motor 1 in an electric vehicle having a small body.

DESCRIPTION OF SYMBOLS 1 Driving motor, 2 inner peripheral parts, 3 cases, 10 rotors, 11 rotating shafts, 12 magnets, 20 stators, 21 coils, 30 shafts, 31 flanges, 41 radial bearings, 42 radial bearings, 43 spline bearings, 100 Moving device, 101 spring, 110 inertial force acting portion, 111 first member, 111a inclined portion, 111b groove, 111c side wall, 112 second member, 112a inclined portion, 113 moving body, 115 thrust bearing, 200 electric motorcycle, 201 body , 202 front fork, 203 swing arm, 204 accelerator lever, 210 front wheel, 220 rear wheel, 221 tire, 230 control device, 240 battery, 250 transmission parts, 251 chain, 252 gear, 253 gear.

Claims (9)

A driving motor (1) for generating a driving force for rotating wheels (220) of an electric vehicle (200),
A rotor (10) rotating about a rotation axis (11),
A stator (20);
A moving device (100) for moving an inner peripheral part (2), which is an inner peripheral side of the rotor (10) and the stator (20), in the direction of the rotation axis (11);
With
The moving device (100) includes an inertial force acting portion (110) in which at least a part of the member rotates together with the rotor (10), and an inertial force acts by the rotation.
The inner peripheral part (2) is configured to move in the direction of the rotating shaft (11) by the inertial force. A driving motor (1). The inertial force acting section (110) includes:
A first member (111) that rotates with the rotor (10);
A second member (112) disposed opposite to the first member (111) in the direction of the rotation axis (11);
A moving body (113) arranged between the first member (111) and the second member (112), and moving in a direction away from the rotation axis (11) by the inertial force;
With
One of the first member (111) and the second member (112) is connected to the inner peripheral part (2),
When the rotor (10) rotates, the moving body (113) moves in a direction away from the rotation shaft (11) to push between the first member (111) and the second member (112). The drive electric motor (1) according to claim 1, wherein the inner peripheral part (2) is configured to move in the direction of the rotation shaft (11) when expanded. The inner peripheral part (2) is the stator (20),
The driving motor (1) according to claim 2, wherein the second member (112) is connected to the stator (20). The moving body (113) is a sphere,
The driving motor (1) according to claim 3, wherein the second member (112) does not rotate with respect to the stator (20). The inner peripheral part (2) is the rotor (10),
The driving motor (1) according to claim 2, wherein the first member (111) is connected to the rotor (10). A driving motor (1) according to any one of claims 1 to 5,
A wheel (220) rotated by a driving force of the driving motor (1),
An electric vehicle (200) comprising: The driving motor (1) is the driving motor (1) according to claim 3 or 4,
The rotor (10) is arranged on an inner peripheral side of a tire (221) of the wheel (220) and connected to the tire (221).
The electric vehicle (200) according to claim 6, wherein the rotor (10) and the tire (221) rotate together. The driving motor (1) is the driving motor (1) according to claim 5,
The driving motor (1) is disposed outside the wheel (220),
The driving motor (1) and the wheels (220) are connected via a transmission component (250) that transmits a driving force of the driving motor (1) to the wheels (220). (200). The electric vehicle (200) according to any one of claims 6 to 8, wherein the electric vehicle (200) is an electric motorcycle.

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