JP5515662B2 - Axial motor - Google Patents

Description

  The present invention relates to an axial motor.

  2. Description of the Related Art Conventionally, axial motors in which a stator and a rotor are arranged to face each other in the direction of the motor rotation axis have been widely used as drive sources for machine tools and pumps (see, for example, Patent Document 1).

The axial motor described in Patent Document 1 includes a stator having a plurality of teeth portions around which coils are wound, and a rotor having a plurality of permanent magnets arranged to face the teeth portions (paragraph [0016], (See FIG. 1). This axial motor is configured such that the rotor rotates with respect to the stator by the action of magnetic flux generated between the teeth and the permanent magnets arranged opposite to each other.
An axial motor has the merit that it is easy to reduce the thickness and size as compared with a radial motor in which a rotor and a stator are arranged to face each other in the radial direction of the rotating shaft.

JP 2009-44941 A

  As described above, in the axial motor described in Patent Document 1, a permanent magnet is provided on the rotor side. In this case, the permanent magnet may be peeled off from the rotor due to the centrifugal force caused by the rotation of the rotor due to the long-term use of the axial motor. Thus, in the form in which the permanent magnet is provided on the rotor side, there is a problem that the durability of the axial motor is low.

  In view of the circumstances as described above, an object of the present invention is to provide an axial motor capable of improving durability.

In order to achieve the above object, an axial motor according to an embodiment of the present invention includes a rotor and a stator.
The rotor has a plurality of rotor teeth arranged at a first pitch along the circumferential direction of the rotating shaft, and is rotatable about the rotating shaft.
The stator includes a plurality of stator teeth, a coil, and a permanent magnet, and is disposed to face the rotor in the axial direction of the rotating shaft.
The plurality of stator teeth each include a facing surface facing the rotor teeth, and are arranged at a second pitch different from the first pitch along the circumferential direction.
The coils are coils wound around the respective stator teeth, and electric power having different phases is supplied to the coils adjacent to each other in the direction along the circumferential direction.
The permanent magnets are provided on the facing surfaces of the stator teeth, and are arranged so that the magnetic poles are alternately different along the circumferential direction.

In the present invention, when electric power is supplied to the coils wound around the stator teeth, magnetic fluxes are respectively generated in the stator teeth arranged along the circumferential direction of the rotating shaft. The coils that are adjacent to each other in the direction along the circumferential direction of the rotating shaft are supplied with electric power having different phases, and thus the magnetic fluxes that change in time and have different strengths in principle are generated in the adjacent coils. .
The magnetic flux generated by the coil acts on the magnetic flux of the permanent magnets provided on the opposing surfaces of the stator teeth. Since the permanent magnets are arranged on the opposing surface so that the magnetic poles are alternately different along the circumferential direction of the rotating shaft, the magnetic flux of the permanent magnet is changed along the circumferential direction of the rotating shaft by the magnetic flux generated in the coil. Be strengthened or weakened.
Thereby, the strength of the magnetic flux is generated along the circumferential direction of the rotating shaft, and the strength of the magnetic flux changes with time. Due to the temporal change in the strength of the magnetic flux along the circumferential direction of the rotating shaft, the rotor teeth arranged at a pitch (second pitch) different from the pitch of the stator teeth (first pitch) are induced. Therefore, the rotor rotates around the rotation axis.

  Thus, in the present invention, the rotation of the rotor is realized by arranging the permanent magnet on the stator side of the axial motor. As a result, the permanent magnet does not peel off from the rotor due to the centrifugal force generated by the rotation of the rotor, and the durability of the axial motor can be improved.

  As described above, according to the present invention, an axial motor capable of improving durability can be provided.

It is a side sectional view showing an axial motor concerning one embodiment of the present invention. It is the perspective view which looked at the axial motor from the rotor side. It is the perspective view which looked at the axial motor from the stator side. It is the top view which looked at the rotor from the stator side. It is the top view which looked at the stator from the rotor side. It is a disassembled perspective view which shows a mode that a part of stator was disassembled. It is a figure for demonstrating operation | movement of an axial motor when alternating current power is not supplied to the coil, and is a figure which shows a mode that the axial motor was expand | deployed linearly. It is a figure for demonstrating operation | movement of an axial motor when alternating current power is supplied to a coil, and is a figure which shows a mode that the axial motor was expand | deployed linearly. It is a figure which shows the change of the electric current which flows into the coil of U phase, V phase, and W phase, and is a supplementary figure for demonstrating FIG. It is a figure for demonstrating the insulator which concerns on other embodiment, and is sectional drawing of a stator tooth | gear, a permanent magnet, and an insulator. It is a perspective view which shows the rotor which concerns on another embodiment. It is a perspective view which shows the stator which concerns on another embodiment. It is a disassembled perspective view which shows the stator of another embodiment. It is the top view which looked at the ring-shaped magnet which the stator of another embodiment has from the rotor side. It is a side view which shows an example in case an axial motor is comprised with two pairs of rotors and stators. It is a side view which shows an example in case an axial motor is comprised with two pairs of rotors and stators.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>

FIG. 1 is a schematic side cross-sectional view showing an axial motor according to a first embodiment of the present invention.
As shown in FIG. 1, the axial motor 100 includes a rotor 1 that can rotate around a rotation shaft 3 and a stator 2 that is disposed to face the rotor 1 in the axial direction of the rotation shaft 3. The rotor 1 is fixed to the rotary shaft 3 via an attachment 4 fixed to the back side of the rotor 1, and is thereby rotatable about the rotary shaft 3 as a central axis. The rotating shaft 3 is supported by a bearing (not shown).

  In the description of the present specification, the direction in which the axis of the rotary shaft 3 faces is the axial direction, the direction around the rotary shaft 3 is the circumferential direction, and the radial direction of the rotary shaft 3 is the radial direction.

  2 is a perspective view of the axial motor 100 viewed from the rotor 1 side, and FIG. 3 is a perspective view of the axial motor 100 viewed from the stator 2 side. In FIG. 2, a part of the rotor 1 is broken and illustrated for easy viewing of the drawing. Similarly, in FIG. 3, a portion of the stator 2 is broken away so that the drawing can be easily seen. In FIG. 2 and subsequent figures, members such as the rotating shaft 3 are omitted for easy understanding of the drawings.

  4 is a plan view of the rotor 1 viewed from the stator 2 side, and FIG. 5 is a plan view of the stator 2 viewed from the rotor 1 side. FIG. 6 is an exploded perspective view showing a state in which a part of the stator 2 is disassembled.

As shown in these drawings, the rotor 1 has a ring-shaped rotor main body 11 and a plurality of rotor teeth 12 provided so as to protrude from the rotor main body 11 to the stator 2 side.
A plurality of rotor teeth 12 are provided at a predetermined pitch (first pitch) along the circumferential direction of the rotating shaft. In the present embodiment, eight rotor teeth 12 are provided at a 45-degree pitch (see FIG. 4).

  The rotor teeth 12 are provided so that the width in the circumferential direction gradually increases from the inner peripheral side to the outer peripheral side of the rotor 1.

The rotor 1 is made of a ferromagnetic material such as iron or silicon steel. The rotor 1 has a laminated structure in which thin ferromagnetic plates such as iron are laminated in the radial direction of the rotation shaft 3.
Since the rotor 1 has a laminated structure in which thin ferromagnetic plates are laminated in the radial direction, generation of eddy current due to a change in magnetic flux can be suppressed. Thereby, energy loss can be reduced.

  The stator 2 includes a stator core 21 that includes a ring-shaped stator body 211 and a plurality of stator teeth 212 (see FIG. 6) provided so as to protrude from the stator body 211 toward the rotor 1. The stator 2 includes coils 22 wound around the outer peripheral surfaces of the stator teeth 212 and permanent magnets 23 provided on the opposing surfaces 212 a of the stator teeth 212 facing the rotor teeth 12.

  A plurality of stator teeth 212 are provided along the circumferential direction of the rotating shaft 3 at a pitch (second pitch) different from the pitch of the rotor teeth 12. In the present embodiment, six stator teeth 212 are provided at a pitch of 60 degrees (see FIG. 5).

  The stator teeth 212 are provided so that the width in the circumferential direction gradually increases from the inner peripheral side to the outer peripheral side of the stator 2.

Like the rotor 1, the stator core 21 is made of a ferromagnetic material such as iron or silicon steel, and has a laminated structure in which thin ferromagnetic plates are laminated in the radial direction of the rotating shaft 3.
Since the stator core 21 has a laminated structure in which the rotating shaft 3 is laminated in the radial direction, generation of eddy current due to a change in magnetic flux can be suppressed, and energy loss can be reduced.

  The coils 22 wound around the stator teeth 212 are supplied with three-phase AC power of U phase, V phase, and W phase in order along the circumferential direction. That is, the AC power having different phases is supplied to the coils 22 adjacent to each other in the circumferential direction.

  The permanent magnets 23 are arranged so that the magnetic poles face the rotor 1 and the magnetic poles are alternately different along the circumferential direction. For one stator tooth 212, there are a pair of permanent magnets 23N and 23S including an N-pole permanent magnet 23N with the N pole facing the rotor 1 and an S-pole permanent magnet 23S with the S pole facing the rotor 1 side. Be placed. That is, two permanent magnets 23 are provided for each stator tooth.

  The pair of permanent magnets 23N and 23S, like the stator teeth 212, are formed so that the width in the circumferential direction increases from the inner peripheral side toward the outer peripheral side. The pair of permanent magnets 23N and 23S has an area equivalent to the facing surface 212a of the stator tooth 212, and is provided so as to cover the entire surface of the facing surface 212a.

  The permanent magnets 23 are individually separated, and the individually separated permanent magnets 23 are bonded onto the opposing surfaces 212a of the stator teeth 212 with an adhesive or the like.

  Next, the operation of the axial motor will be described.

  FIG. 7 is a diagram for explaining the operation of the axial motor 100 when AC power is not supplied to the coil 22. In FIG. 7, a state in which the axial motor 100 is linearly expanded is shown, and a flow of magnetic flux when AC power is not supplied to the coil 22 is shown.

  FIG. 8 is a diagram for explaining the operation of the axial motor 100 when AC power is supplied to the coil 22. FIGS. 8A to 8C show a state in which the axial motor 100 is linearly deployed, and the currents flowing through the U-phase, V-phase, and W-phase coils 22 are maximum, respectively. The flow of magnetic flux is shown.

  FIG. 9 is a diagram showing changes in the current flowing through the U-phase, V-phase, and W-phase coils 22, and is a supplementary diagram for explaining FIG.

  In FIG. 7 to FIG. 9, for convenience, coils supplied with U-phase, V-phase, and W-phase AC power are respectively referred to as U-phase, V-phase, and W-phase coils 22U, 22V, and 22W. Call. The stator teeth around which the U-phase, V-phase, and W-phase coils are wound are referred to as U-phase, V-phase, and W-phase stator teeth 212U, 212V, and 212W. Similarly, a pair of permanent magnets provided on U-phase, V-phase, and W-phase stator teeth 212U, 212V, and 212W are referred to as a U-phase, V-phase, and W-phase pair of permanent magnets 23U, 23V, and 23W. Of the pair of U-phase, V-phase, and W-phase permanent magnets 23U, 23V, and 23W, when particularly distinguishing the N-pole permanent magnet from the S-pole permanent magnet, the U-phase N-pole, U-phase S The permanent magnets 23UN, 23US, 23VN, 23VS, 23WN, and 23WS having poles, V-phase N-pole, V-phase S-pole, W-phase N-pole, and W-phase S-pole are referred to (see FIG. 8).

  In FIG. 8, in order to distinguish the stator teeth, for convenience, reference numerals 12 </ b> A to 12 </ b> D are attached four by four in order from the left.

  As shown in FIG. 7, when AC power is not supplied to the three-phase coils 22U, 22V, and 22W, no magnetic flux is generated by the coils, and only the magnetic flux by the pair of three-phase permanent magnets 23U, 23V, and 23W. Will occur. In this case, the magnetic flux of the three-phase pair of permanent magnets 23U, 23V, and 23W acts on the rotor teeth 12. However, the rotor 1 is positioned at a position where the forces of the rotor 1 receiving the magnetic force generated by the stator 2 are balanced. It is stationary. In the present embodiment, the forces acting on the rotor 1 are balanced so that the three stator teeth 212 correspond to the four rotor teeth 12.

  Next, a case where AC power is supplied to the three-phase coils 22U, 22V, and 22W will be described.

  First, the positional relationship between the stator teeth 212 and the rotor teeth 12 at the moment when the current flowing through the U-phase coil 22U is maximum will be described with reference to FIG.

  In this case, the current flowing through the U-phase coil 22U is the maximum, and half of the current flowing through the U-phase coil 22U flows through the U-phase coil 22U through the V-phase and W-phase coils 22V and 22W. It flows in the direction opposite to the current (see FIG. 9A). As a result, magnetic fluxes are generated downward on the U-phase stator teeth 212U, upward on the V-phase stator teeth 212V, and upward on the W-phase stator teeth 212W. In this case, the magnetic flux generated in the U-phase stator teeth 212U is maximized, and half the magnetic flux generated in the U-phase stator teeth 212U is generated in the V-phase stator teeth 212V and the W-phase stator teeth 212W. .

  The magnetic flux generated in the three-phase stator teeth 212U, 212V, and 212W by the three-phase coils 22U, 22V, and 22W acts on the magnetic flux of the three-phase pair of permanent magnets 23U, 23V, and 23W.

  Focusing on the U phase, the magnetic flux generated by the U phase stator teeth 212U by the U phase coil 22U strengthens the magnetic flux of the U phase N pole permanent magnet 23UN and weakens the magnetic flux of the U phase S pole permanent magnet 23US. Focusing on the V-phase, the magnetic flux generated by the V-phase stator teeth 212V by the V-phase coil 22V weakens the magnetic flux of the V-phase N-pole permanent magnet 23VN and strengthens the magnetic flux of the V-phase S-pole permanent magnet 23VS. Focusing on the W phase, the magnetic flux generated by the W-phase stator teeth 212W by the W-phase coil 22W weakens the magnetic flux of the W-phase N-pole permanent magnet 23WN and strengthens the W-phase S-pole permanent magnet 23WS.

  Thereby, the flow of the magnetic flux of the axial motor 100 becomes a flow as shown in FIG. Describing the flow of magnetic flux starting from the U phase, the magnetic flux generated in the U phase stator teeth 212U by the U phase coil 22U strengthens the magnetic flux of the U phase N pole permanent magnet 23UN, and this U phase N pole It flows into the rotor tooth 12A through the permanent magnet. The magnetic flux flowing into the rotor 1 side branches, and one of the branched magnetic fluxes flows into the V-phase S-pole permanent magnet 23VS via the rotor teeth 12C. The other branched magnetic flux flows into the W-phase S-pole permanent magnet 23WS via the rotor teeth 12D.

  The magnetic flux flowing into the V-phase stator teeth 212V is strengthened by the V-phase coil 22V, and the magnetic flux flowing into the W-phase stator teeth 212W is strengthened by the W-phase coil 22W. These magnetic fluxes merge, and the merged magnetic flux flows into the U-phase stator teeth 212U. The magnetic flux flowing into the U-phase stator teeth 212U is strengthened by the U-phase coil 22U and flows again into the rotor teeth 12A via the U-phase N-pole permanent magnet 23UN.

  Since the magnetic flux flowing into the rotor teeth 12A from the U-phase N-pole permanent magnetized 23UN flows perpendicularly to the center of the rotor teeth 12A, the force by the magnetic flux is balanced in the rotational direction of the rotor 1. The force caused by the magnetic flux flowing from the rotor tooth 12C into the V-phase S-pole permanent magnet 23VS and the force caused by the magnetic flux flowing from the rotor tooth 12D into the W-phase S-pole permanent magnet 23WS are opposite to the rotational direction of the rotor 1, and Since they are of similar magnitude, these forces cancel out.

  That is, at the moment when the current flowing through the U phase is maximum, the positional relationship between the stator teeth 212 and the rotor teeth 12 is balanced by the positional relationship shown in FIG.

  From this state, as time elapses and the current flowing through the U-phase, V-phase, and W-phase coils 22U, 22V, and 22W changes, the U-phase, V-phase, and W-phase stator teeth 212U, 212V, and 212W The generated magnetic flux changes. Along with this, the permanent magnet 23 whose magnetic flux is strengthened and the permanent magnet 23 whose magnetic flux is weakened change, and the magnetic flux generated from the stator 2 side also changes. As the magnetic flux changes, the rotor teeth 12 arranged at a different pitch from the stator teeth 212 are guided, and the rotor 1 is rotated around the rotary shaft 3.

  With reference to FIG. 8B, a case will be described in which time elapses from the moment when the current flowing in the U phase is maximum and the current flowing in the V phase becomes maximum.

  In this case, the current flowing through the V-phase coil 22V is the maximum, and half of the current flowing through the V-phase coil 22V is opposite to the V-phase coil 22V in the U-phase and W-phase coils 22U and 22W. It flows in the direction (see FIG. 9B). As a result, a magnetic flux is generated downward in the V-phase stator teeth 212V, and half of the magnetic flux generated in the V-phase stator teeth 212V is generated in the U-phase stator teeth 212U and the W-phase stator teeth 212W. To do.

  As a result, the magnetic flux of the V-phase N-pole permanent magnet 23VN, the magnetic flux of the U-phase S-pole permanent magnet 23US, and the magnetic flux of the W-phase S-pole permanent magnet 23WS are strengthened, and the magnetic flux of the V-phase S-pole permanent magnet 23VS, The magnetic flux of the U-phase N-pole permanent magnet 23UN and the magnetic flux of the W-phase N-pole permanent magnet 23WN are weakened.

  The flow of magnetic flux shown in FIG. 8B will be described starting from the V phase. The magnetic flux generated in the V-phase stator teeth 212V by the V-phase coil 22V strengthens the magnetic flux of the V-phase N-pole permanent magnet 23VN and flows into the rotor teeth 12B via the V-phase N-pole permanent magnet 23VN. The magnetic flux flowing into the rotor 1 side branches, and one of the branched magnetic fluxes flows into the U-phase S-pole permanent magnet 23US via the rotor teeth 12A. The other branched magnetic flux flows into the W-phase S-pole permanent magnet 23WS via the rotor teeth 12D.

  The magnetic flux flowing into the U-phase stator teeth 212U and the magnetic flux flowing into the W-phase stator teeth 212W are strengthened by the U-phase coil 22U and the W-phase coil 22W. These magnetic fluxes merge and flow into the V-phase stator teeth 212V, are strengthened by the V-phase coil 22V, and flow into the rotor teeth 12B again via the V-phase N-pole permanent magnet 23VN.

  The force due to the magnetic flux flowing into the rotor teeth 12B from the V-phase N-pole permanent magnetized 23VN is balanced in the rotational direction of the rotor 1. The force caused by the magnetic flux flowing from the rotor tooth 12A into the U-phase S-pole permanent magnet 23US and the force caused by the magnetic flux flowing from the rotor tooth 12D into the W-phase S-pole permanent magnet 23WS are opposite to the rotational direction of the rotor 1, and Since they are of similar magnitude, these forces cancel out. That is, when the current flowing in the V phase is the maximum, the positional relationship between the stator teeth 212 and the rotor teeth 12 is balanced by the positional relationship shown in FIG.

  As time elapses from this state and the current flowing through the U-phase, V-phase, and W-phase coils 22U, 22V, and 22W changes, the magnetic flux generated from the stator 2 side changes, so that the stator teeth 12 are induced. Thus, the rotor 1 is rotated.

  With reference to FIG. 8C, a case will be described in which time elapses from the moment when the current flowing in the V phase is maximum and the current flowing in the W phase becomes maximum.

  In this case, the current flowing through the W-phase coil 22W is the maximum, and the U-phase and V-phase coils 22U and 22V have half the current flowing through the W-phase coil 22W opposite to the W-phase coil 22W. It flows in the direction (see FIG. 9C). As a result, a magnetic flux is generated downward in the W-phase stator teeth 212W, and half of the magnetic flux generated in the W-phase stator teeth 212W is generated upward in the U-phase stator teeth 212U and the V-phase stator teeth 212V. To do.

  Thereby, the magnetic flux of the W-phase N-pole permanent magnet 23WN, the magnetic flux of the U-phase S-pole permanent magnet 23US and the magnetic flux of the V-phase S-pole permanent magnet 23VS are strengthened, and the magnetic flux of the W-phase S-pole permanent magnet 23WS, The magnetic flux of the U-phase N-pole permanent magnet 23UN and the magnetic flux of the V-phase N-pole permanent magnet 23VN are weakened.

  The flow of magnetic flux shown in FIG. 8C will be described starting from the W phase. The magnetic flux generated in the W-phase stator teeth 212W by the W-phase coil 22W strengthens the magnetic flux of the W-phase N-pole permanent magnet 23WN and flows into the rotor teeth 12C via the W-phase N-pole permanent magnet 23WN. The magnetic flux flowing into the rotor 1 side branches, and one of the branched magnetic fluxes flows into the U-phase S-pole permanent magnet 23US via the rotor teeth 12A. The other branched magnetic flux flows into the V-phase S-pole permanent magnet 23VS via the rotor teeth 12B.

  The magnetic flux flowing into the U-phase stator teeth 212U and the magnetic flux flowing into the V-phase stator teeth 212V are strengthened by the U-phase coil 22U and the V-phase coil 22V. These magnetic fluxes merge and flow into the W-phase stator teeth 212W.

  The force caused by the magnetic flux flowing from the W-phase N-pole permanent magnetized 23WN into the rotor teeth 12C is balanced in the rotational direction of the rotor 1. The force caused by the magnetic flux flowing from the rotor tooth 12A into the U-phase S-pole permanent magnet 23US and the force caused by the magnetic flux flowing from the rotor tooth 12B into the V-phase S-pole permanent magnet 23VS are opposite to the rotational direction of the rotor 1, and Since they are of similar magnitude, these forces cancel out. Therefore, when the current flowing through the W phase is maximum, the positional relationship between the stator teeth 212 and the rotor teeth 12 is balanced by the positional relationship shown in FIG.

  As time elapses from this state and the current flowing through the U-phase, V-phase, and W-phase coils 22U, 22V, and 22W changes, the magnetic flux generated from the stator 2 side changes, so that the stator teeth 12 are induced. Thus, the rotor 1 is rotated.

  Again, the current flowing in the U-phase is maximized. When an alternating current is supplied to the three-phase coils 22U, 22V, and 22W by such a cycle, the rotor 1 continues to rotate around the rotation shaft 3.

  As described above, in this embodiment, the rotor 1 is rotated by arranging the permanent magnet on the stator 2 side of the axial motor 100. Thereby, the permanent magnet 23 is not peeled off from the rotor 1 due to the centrifugal force generated by the rotation of the rotor 1, and the durability of the axial motor 100 can be improved.

Furthermore, in this embodiment, since the rotor 1 and the stator core 21 have a laminated structure laminated in the radial direction of the rotating shaft, generation of eddy currents due to changes in magnetic flux can be suppressed, and energy loss can be reduced. Can be reduced.
Second Embodiment

Next, a second embodiment of the present invention will be described.
In the first embodiment described above, the case where the coil 22 is directly wound around the stator tooth 212 has been described. On the other hand, in the second embodiment, the first embodiment is such that the coil 22 is wound around the stator tooth 212 via the insulator and that the insulator is configured to fix the permanent magnet 23 to the stator tooth 212. Is different. Therefore, this point will be mainly described. In the description after the second embodiment, members having the same configurations and functions as those of the first embodiment are denoted by the same reference numerals, and the description thereof is simplified or omitted.

  FIG. 10 is a view for explaining the insulator according to the present embodiment, and is a cross-sectional view of the stator tooth 212, the permanent magnet 23, and the insulator. FIG. 10 shows a cross section viewed from the outer peripheral side of the stator. In FIG. 10, the coil 22 is omitted.

  As shown in FIG. 10, in the second embodiment, a fitting groove 213 is provided along the outer periphery of the stator tooth 212 at the boundary part (the root part of the stator tooth 212) between the stator body 211 and the stator tooth 212. Yes. The fitting groove 213 is provided over the entire outer periphery of the stator tooth 212. Moreover, in 2nd Embodiment, the taper surface 23a which inclines toward the outer side over the perimeter at the edge part of the outer periphery of a pair of permanent magnet 23N, 23S provided on the opposing surface 212a of the stator tooth | gear 212. Is provided.

  The insulator 24 covers the outer peripheral surface of the stator tooth 212, and is provided at a cylindrical portion 241 around which the coil 22 is wound, and an upper flange that protrudes outward from the cylindrical portion 241. Part 242 and a lower flange part 243 provided on the lower edge of the cylindrical part 241 and projecting outward from the cylindrical part 241. The upper flange portion 242 and the lower flange portion 243 are provided over the entire circumference of each edge portion of the cylindrical portion 241. That is, the insulator 24 also has a function as a coil bobbin.

  The insulator 24 is provided at the upper edge of the cylindrical portion 241, and is provided at the first claw 244 protruding inward from the cylindrical portion 241 and the lower edge of the cylindrical portion 241, and is cylindrical. A second claw 245 projecting inward from the portion 241. The 1st nail | claw 244 and the 2nd nail | claw 245 are provided over the perimeter of each edge of the cylindrical part 241. FIG.

  The first claw 244 is provided with a tapered surface 244a that is inclined at an angle equivalent to the tapered surface 23a of the pair of permanent magnets 23N and 23S. The first claw 244 presses the pair of permanent magnets 23N and 23S from above by the taper surface 244a of the first claw 244 coming into contact with the taper surfaces 23a of the pair of permanent magnets 23N and 23S.

The second claw 245 is fitted into a fitting groove 213 provided in the stator core 21. As a result, the insulator 24 can be prevented from falling off the stator teeth 212, and the insulator 24 can be reliably fixed to the stator teeth 212.
The insulator 24 is made of an insulating material such as resin and can reliably electrically insulate the stator tooth 212 and the coil 22 from each other.

  As described above, in the present embodiment, the insulator 24 is securely fixed to the stator tooth 212 by the second claw 245, and the pair of permanent magnets 23N and 23S are moved upward by the first claw 244. Can be pressed from. Thereby, the pair of permanent magnets 23N and 23S can be reliably fixed to the stator teeth 212, and the durability of the axial motor 100 can be further improved.

  In the above description, the first claw 244 has been described as being provided over the entire periphery of the upper edge of the cylindrical portion 241. However, the present invention is not limited to this, and the first claw 244 may be provided intermittently along the upper edge of the cylindrical portion 241. In this case, the tapered surface 23a provided on the outer peripheral side of the pair of permanent magnets 23N and 23S may also be provided intermittently along the edges of the pair of permanent magnets 23N and 23S.

  Similarly, the second claw 245 is not limited to the case where the second claw 245 is provided over the entire periphery of the lower edge of the cylindrical portion 241, and may be provided intermittently along the lower edge of the cylindrical portion 241. Good. In this case, the fitting groove 213 provided in the stator core 21 may also be provided intermittently along the outer periphery of the stator tooth 212.

The insulator 24 may be configured integrally with one member, or may be configured by combining a plurality of members divided in the direction along the outer peripheral surface of the stator tooth 212. . In the case where the insulator 24 is configured by a plurality of members, the assembly is facilitated when the coil 22 is wound around the insulator 24 after the plurality of members are fitted into the stator teeth 212 and combined.
On the other hand, in the case where the insulator 24 is configured by one member, the assembly is performed when the insulator 24 around which the coil 22 is wound is fitted into the stator tooth 212 after the coil 22 is wound around the insulator 24. It becomes easy. However, the present invention is not necessarily limited thereto, and the coil 22 may be wound around the insulator 24 after the insulator 24 is fitted into the stator teeth 212.
<Third Embodiment>

Next, a third embodiment of the present invention will be described.
In the third embodiment, the numbers of rotor teeth and stator teeth (pitch) are different from those of the above-described embodiments. Further, the present embodiment is different from the above-described embodiments in that a single ring-shaped member is magnetized to form a plurality of permanent magnets. Therefore, this point will be mainly described.

  FIG. 11 is a perspective view showing a rotor according to the third embodiment. FIG. 12 is a perspective view showing a stator according to the third embodiment. FIG. 13 is an exploded perspective view showing the stator. FIG. 14 is a plan view of the ring magnet as viewed from the rotor side.

  As shown in FIG. 11, the rotor 6 according to the third embodiment includes a ring-shaped rotor main body 61 and four rotor teeth 62 protruding from the rotor main body 61 toward the stator 5. The rotor teeth 62 are arranged at a pitch of 90 degrees along the circumferential direction of the rotating shaft 3.

  As shown in FIGS. 12 to 14, the stator 5 according to the third embodiment includes a ring-shaped stator main body 511 and three stator teeth 512 provided so as to protrude from the stator main body 511 to the rotor 61 side. The stator core 51 is included. The three stator teeth 512 are arranged at a pitch of 120 degrees along the circumferential direction of the rotating shaft 3. The stator 5 includes three coils 52 wound around the stator teeth 512 and a ring-shaped magnet 53 provided on the facing surface 512a of the stator teeth 512.

  The ring-shaped magnet 53 has a plurality of permanent magnets 531 arranged so that the magnetic poles face the rotor 61 and the magnetic poles are alternately different along the circumferential direction of the rotating shaft 3. The permanent magnet 531 is formed by magnetizing a thin ring-shaped member made of a ferromagnetic material such as iron so that the magnetic poles are alternately different along the circumferential direction of the rotating shaft 3.

  A pair of permanent magnets 531N and 531S composed of an N-pole permanent magnet 531N and an S-pole permanent magnet 531S are provided at a 120-degree pitch in the circumferential direction, like the stator teeth 512 (see FIG. 14). ). The pair of permanent magnets 531N and 531S are formed so as to increase in width in the circumferential direction from the inner peripheral side toward the outer peripheral side, and have the same area as the facing surfaces 512a of the stator teeth 512. Three unmagnetized portions 532 are formed between the three pairs of permanent magnets 531N and 531S.

  The three pairs of permanent magnets 531N and 531S are bonded to the facing surfaces 512a of the three stator teeth 512 with an adhesive or the like.

  In the third embodiment, the coil 52 can be pressed from above by the unmagnetized portion 532 of the ring-shaped magnet 53. As a result, the coil 52 can be prevented from falling off the stator teeth 512, so that the durability of the axial motor can be improved.

  Further, the present embodiment is different from the case where the permanent magnets 23 are individually separated and individually bonded to the stator core 21 like the permanent magnets 23 of the axial motor 100 according to the first embodiment. In the present embodiment, since one ring-shaped magnet 53 has only to be bonded to the stator core 51, the manufacture of the axial motor is facilitated.

In the description of the third embodiment, the case where there are three stator teeth 512, coils 52, and a pair of permanent magnets 531N, 531S has been described. However, the number of these is not particularly limited.
<Various modifications>

  In each of the above-described embodiments, the case where the axial motor includes the pair of rotors 1 and the stator 2 (or the stator 5) has been described. However, the present invention is not limited to this, and the axial motor may be composed of two or more pairs of the rotor 1 and the stator 2 (or the stator 5).

  FIGS. 15 and 16 are side views showing an example in which the axial motor is composed of two pairs of the rotor 1 and the stator 2.

  As shown in FIG. 15, the axial motor 200 is configured such that two rotors 1 are arranged to face each other on the back side, and each stator 2 is arranged to face each rotor 1. In the axial motor 200, the force attracted to each rotor 1 by each stator 2 cancels out in the axial direction of the rotating shaft 3, so that the rotor 1 can be rotated smoothly.

  As shown in FIG. 16, the axial motor 300 is configured such that two stators 2 are arranged to face each other on the back side, and each rotor 1 is arranged to face each stator 2.

  In the description of each of the embodiments described above, the ratio of the number of rotor teeth 12 (or rotor teeth 62, the same applies below) and stator teeth 212 (or stator teeth 512, the same applies below) is 4: 3. Explained.

  However, the ratio of the number of rotor teeth 12 and stator teeth 212 is not limited to this. In principle, if the number of rotor teeth 12 and the number of stator teeth 212 are different (if the pitch of the rotor teeth 12 and the pitch of the stator teeth 212 are different), the rotor 1 is rotated appropriately. Is possible.

  When a small number is selected as the number of rotor teeth 12 and stator teeth 212, it is advantageous in that the rotor 1 can be rotated at a high speed. When a large number is selected, the rotation of the rotor 1 is precise. It is advantageous in that it can be controlled.

  When a small number is selected as the number of rotor teeth 12 and stator teeth 212 and a high-speed axial motor is used, an axial motor suitable for high-speed can be created based on the above-mentioned ratio of 4: 3. it can.

  In the description of each of the above-described embodiments, the permanent magnet 23 (or the permanent magnet 531, and the same below) is the N pole S pole along the circumferential direction for each stator tooth 212 (or the stator tooth 512, and so on). The case where N poles S poles, N poles S poles... Are arranged in this order has been described (see FIGS. 5 and 14). However, the present invention is not limited to this, and the permanent magnets 23 may be arranged in the order of N pole S pole, S pole N pole, N pole S pole,... In this case, the permanent magnets 23 are arranged so that the magnetic poles are alternately different in the circumferential direction with respect to one stator tooth 212.

  In the description of each embodiment described above, a pair of permanent magnets 23N, 23S (or a pair of permanent magnets 531N, 531S, and so on) is provided for one stator tooth 212 (or stator tooth 512, and so on). Described as arranged. That is, it has been described that two permanent magnets 23N and 23S are arranged for one stator tooth 212.

  However, the present invention is not limited to this, and one permanent magnet 23 may be arranged for one stator tooth 212. Alternatively, three or more permanent magnets 23 may be arranged for one stator tooth 212. Also in these cases, the permanent magnets 23 are arranged so that the magnetic poles are alternately different along the circumferential direction of the rotating shaft. Even in such a case, the rotor can be rotated by appropriately adjusting the number (pitch) of the rotor teeth 12 and the stator teeth 212.

DESCRIPTION OF SYMBOLS 1, 6 ... Rotor 2, 5 ... Stator 3 ... Rotating shaft 11, 61 ... Rotor main body 12, 12A, 12B, 12C, 12D, 62 ... Rotor tooth 21, 51 ... Stator core 22, 22U, 22V, 22W, 52 ... Coil 23, 23N, 23S, 23UN, 23US, 23VN, 23VS, 23WN, 23WS, 531, 531N, 531S ... Permanent magnet 24 ... Insulator 53 ... Ring-shaped magnet 100, 200, 300 ... Axial motor 211, 511 ... Stator body 212, 212U, 212V, 212W, 512 ... stator teeth 212a, 512a ... opposite surfaces

Claims (1)

A rotor having a plurality of rotor teeth arranged at a first pitch along a circumferential direction of the rotation axis, and rotatable about the rotation axis;
A plurality of stator teeth each including a facing surface facing the rotor teeth and arranged at a second pitch different from the first pitch along the circumferential direction, and wound around each of the stator teeth. A coil in which different phases of power are supplied to the coils adjacent to each other in a direction along the circumferential direction, and a cylindrical shape that covers the outer peripheral surface of each stator tooth and is wound around each coil And an insulator made of an insulating material, provided at each edge of the cylindrical portion and projecting inward from the cylindrical portion, and each stator tooth A stator that is provided on each of the opposing surfaces, and has permanent magnets that are arranged so that magnetic poles are alternately different along the circumferential direction, and that is opposed to the rotor in the axial direction of the rotating shaft;
Equipped with,
A surface that is pressed down by the first claw is provided on the outer peripheral edge of the permanent magnet,
An axial motor provided with a fitting groove into which the second claw is fitted along the outer periphery of each stator tooth .

Images