JP2007236160A - Synchronous motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a synchronous motor to which a permanent magnet, that is easy to handle can be fixed surely to the outer peripheral surface of a rotor. <P>SOLUTION: The synchronous motor, having a plurality of permanent magnets 5A on the outer peripheral surface of the rotor 2 includes a resin-coating member 6 for coating the surface on the outer peripheral side of the permanent magnets 5A, in arranging them on the outer peripheral surface of the rotor 2 of the permanent magnets 5A. Fixing parts 7, 8 to be fixed to the outer peripheral surface of the rotor 2 are provided at the opposite ends in the peripheral direction of the coating member 6, and a plurality of penetration holes 9 are formed in the fixing parts 7, 8 for inserting a screw 10 therethrough, to fix the coating member 6 and the permanent magnets 5A to the rotor 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotor of a synchronous motor using a permanent magnet.

  A permanent magnet type synchronous motor (hereinafter referred to as PM motor) has an IPM (Interior Permanent Magnet) motor in which a permanent magnet is disposed inside a rotor and a permanent magnet is disposed on an outer peripheral surface due to the structure of the rotor. It is roughly divided into SPM (Surface Permanent Magnet) motors. Since the SPM motor has permanent magnets arranged on the outer peripheral surface of the rotor, inductance is reduced, high-speed current response is obtained, and reluctance torque is not generated. Can be used. In the SPM motor having such characteristics, the following representative examples can be given as a method for fixing the permanent magnet disposed on the outer peripheral surface of the rotor.

(1) A permanent magnet is fixed to the outer peripheral surface of the rotor using an adhesive (see FIG. 11A).
(2) A groove in which the permanent magnet is fitted is formed in the rotor, and the permanent magnet is inserted and fixed in the groove (see FIG. 11B).
(3) A high-strength tape is wound around and fixed to the surface of the permanent magnet (see FIG. 11C).
(4) A permanent magnet is fixed by the combination of (1) to (3) above.

Japanese Patent Laid-Open No. 2003-32929 JP 2002-186208 A JP 2001-61244 A

  In SPM motors, especially in the high-speed rotation range, a large centrifugal force acts on the permanent magnets arranged on the outer peripheral surface. Therefore, the permanent magnets must be installed so that the permanent magnets are not dropped from the rotor and damaged by the centrifugal force during rotation. It must be securely fixed to the rotor. However, the conventional fixing methods shown in the above (1) to (4) have the following problems.

(1) A desired adhesive force cannot be obtained unless the adhesive surface between the permanent magnet and the rotor is managed accurately.
(2) Since the permanent magnet is held in the shape of a groove against centrifugal force, the dimensional accuracy must be managed accurately.
(3) In order to wind the tape around the surface of the permanent magnet, the strength performance cannot be obtained unless the contact surface with the magnet is made as large as possible.

  In addition, in the SPM motor, a magnetic material such as iron is attracted to the surface of the permanent magnet due to the structure of the rotor.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a synchronous motor that is easy to handle and can be reliably fixed when a permanent magnet is fixed to a rotor outer peripheral surface.

A synchronous motor according to a first invention for solving the above-described problems is as follows.
In the synchronous motor having a plurality of permanent magnets on the outer peripheral surface of the rotor,
A resin-made covering member that covers the outer peripheral surface of the permanent magnet when the permanent magnet is disposed on the outer peripheral surface of the rotor;
Fixing portions that are fixed to the outer peripheral surface of the rotor are provided at both end portions in the circumferential direction of the covering member, and screws are inserted into the fixing portion, so that the covering member and the permanent magnet are attached to the rotor. A plurality of through holes to be fixed are provided.

A synchronous motor according to a second invention for solving the above-described problem is
In the synchronous motor having a plurality of permanent magnets on the outer peripheral surface of the rotor,
A resin coating member that covers the entire permanent magnet is provided,
Fixing portions that are fixed to the outer peripheral surface of the rotor are provided at both end portions in the circumferential direction of the covering member, screws are inserted into the fixing portion, and the covering member and the permanent magnet are attached to the rotor. A plurality of through holes to be fixed are provided.

A synchronous motor according to a third invention for solving the above-described problem is as follows.
In the synchronous motor according to the second invention,
Provided on the surface of the covering member on the rotor side is a protrusion that has a tip that is larger than the portion that supports the tip,
The rotor is provided with a groove into which the protrusion is fitted.

A synchronous motor according to a fourth invention for solving the above-described problem is
In the synchronous motor according to the second invention,
On the surface of the covering member on the rotor side, provided with a protrusion having an arrow shape deformable in the width direction at the tip,
The rotor is provided with a narrow cavity hole in which an end of the protruding portion can be inserted and an inlet of the inserted protruding portion is hooked.

A synchronous motor according to a fifth invention for solving the above-mentioned problem is as follows.
In the synchronous motor according to any one of the first to fourth inventions,
The fixing portion is provided between the adjacent covering members so that the fixing portion of one of the covering members overlaps the fixing portion of the other covering member,
The through holes are provided at positions where the fixing portions overlap each other and communicate with each other.

A synchronous motor according to a sixth invention for solving the above-described problems is as follows.
In the synchronous motor according to any one of the first to fourth inventions,
The covering members are integrally formed in an annular shape.

  According to the present invention, the outer peripheral surface of the permanent magnet is covered with resin, or the entire permanent magnet is molded with resin, so that the permanent magnet surface can be protected. In particular, when the entire permanent magnet is molded with resin, handling such as carrying the permanent magnet and fixing it to the rotor becomes easy. For example, compared to a production method using an adhesive, no equipment for curing the adhesive is required, and it does not take much time. Also, compared to a production method using a high-strength tape, no equipment for winding a tape is required. Thus, the reliability of the rotor itself is increased.

FIG. 1 is a diagram showing an outline of a rotor in a synchronous motor according to the present invention. FIG. 1 (a) is a perspective view, and FIG. 1 (b) is a cross-sectional view taken along line AA in FIG. FIG.
As shown in FIGS. 1 (a) and 1 (b), in the synchronous motor according to the present invention, the rotor 1 is disposed in the longitudinal direction at the center of the cylindrical rotor body 2 and the rotor body 2, and rotates. A shaft 3 serving as a shaft and a plurality of magnet portions 4 arranged on the outer peripheral surface of the rotor body 2 are provided.

In the present invention, when the magnet portion 4 is fixed to the outer peripheral surface of the rotor body 2, the front side of the permanent magnet (outer peripheral surface side) or the entire permanent magnet is covered with resin, thereby simplifying the fixing operation. In addition, the surface of the permanent magnet is protected, and it is securely fixed so as to withstand a large centrifugal force.
Hereinafter, each example of the embodiment of the synchronous motor according to the present invention will be described in detail with reference to FIGS.

  FIG. 2 is a diagram illustrating an example of a configuration in which a permanent magnet is fixed to a rotor outer peripheral surface in the rotary electric motor according to the present invention. This explains the fixing structure of the magnet part 4 and the rotor body 2 in FIG. 1, FIG. 2 (a) shows a single fixing structure, and FIG. 2 (b) shows a single fixing structure. The state which has arranged two or more on the outer peripheral surface of a rotor main body is shown.

  As shown in FIGS. 2A and 2B, in this embodiment, when the permanent magnet 5 </ b> A constituting the magnet unit 4 is arranged and fixed on the outer peripheral surface of the rotor body 2, the outer peripheral side of the permanent magnet 5 </ b> A. A resin fixture 6 (covering member) that covers the surface (the surface of the permanent magnet 5A opposite to the rotor body 2) is used. That is, from the front side of the permanent magnet 5 </ b> A, the permanent magnet 5 </ b> A is covered with the fixture 6, and the fixture 6 is fixed to the rotor body 2.

  In the fixture 6, a holding portion 6a is formed in accordance with the shape of the permanent magnet 5A, and a hollow portion 6b for holding the permanent magnet 5A is formed inside the holding portion 6a. For example, if the cross-sectional shape is a dome-shaped permanent magnet 5A, a dome-shaped hollow portion 6b is formed inside the holding portion 6a in accordance with the shape, and a dome-shaped outer holding portion 6a is formed. Good.

  In addition, fixing portions 7 and 8 that follow the outer peripheral surface shape of the rotor body 2 are fixed to both end portions in the circumferential direction of the fixing tool 6 so as to be closely fixed to the outer peripheral surface of the rotor body 2. The fixing portions 7 and 8 are provided along the axial direction of the rotor body 2. Then, screws 10 are inserted into a plurality of screw holes 9 (through holes) formed in the fixing portions 7 and 8, and the fixing tool 6 is moved to the rotor body 2 side together with the permanent magnet 5A held in the cavity portion 6b. I try to fix it.

  In the fixing portions 7 and 8, one fixing portion 7 is formed at a position in close contact with the outer peripheral surface of the rotor main body 2, and the other fixing portion 8 is the fixing portion 7 of another adjacent fixing tool 6. It is formed at a position that is in close contact with the front side surface. That is, in the adjacent fixtures 6, the fixing portion 8 of one fixing device 6 is provided so as to overlap the fixing portion 7 of the other fixing device 6, and the fixing portion 8 is adjacent to the other fixing device 6. It is the structure which closely_contact | adheres to the outer peripheral surface of the rotor main body 2 through the fixing | fixed part 7. And the screw hole 9 is provided in the position which mutually communicates in the fixing parts 7 and 8 which overlap, and when fixing the fixing tool 6 to the rotor main body 2, the screw 10 is fixed from the front side to the fixing part 8, It is inserted through the fixing portion 7 and screwed to the rotor body 2 side.

  In this embodiment, the fixing part 8 of one fixing tool 6 is provided so as to overlap the fixing part 7 of the other fixing tool 6, but both the fixing parts 7 and 8 are the outer periphery of the rotor body 2. It may be formed at a position that is in direct contact with the surface.

  With the above configuration, when the permanent magnet 5A is fixed to the outer peripheral surface of the rotor body 2, the front side of the permanent magnet 5A is covered with the resin fixture 6, so that the surface protection of the permanent magnet 5A can be performed. In addition, since the fixture 6 that holds the permanent magnet 5A is securely fixed to the rotor body 2 by the screw 10, it can withstand a large centrifugal force and can be operated in a high-speed rotation range.

  The length in the longitudinal direction of the fixture 6 is preferably equal to the length in the longitudinal direction of at least one permanent magnet 5A, and preferably the length in the axial direction of the rotor body 2 if possible. More desirable.

  FIG. 3 is a diagram illustrating another example of a configuration in which a permanent magnet is fixed to an outer peripheral surface of a rotor in a rotary electric motor according to the present invention. This also explains the fixing structure of the magnet part 4 and the rotor main body 2 in FIG. 1, and here, the fixing structure of a single body is shown.

  As shown in FIG. 3, in this embodiment, a resin fixture 11 (covering member) is formed in advance so as to cover the entire outer periphery of the permanent magnet 5 </ b> A constituting the magnet portion 4. The permanent magnet 5A is held so as to be embedded therein. When the permanent magnet 5A is arranged and fixed on the outer peripheral surface of the rotor body 2, the fixture 11 itself that holds the permanent magnet 5A inside is fixed to the outer peripheral surface of the rotor body 2. .

  In the present embodiment, the fixture 11 is formed by molding a resin so as to cover the entire permanent magnet 5A along the outer surface of the permanent magnet 5A. For example, if the cross-sectional shape is a dome-shaped permanent magnet 5A, the dome-shaped outer fixture 11 is formed in accordance with the shape. The surface of the fixture 11 that contacts the rotor main body 2 is preferably formed in a curved shape having the same radius as the rotor main body 2 so as to be in close contact with the outer periphery of the rotor main body 2.

  In addition, fixing portions 12 and 13 that match the shape of the outer peripheral surface of the rotor body 2 are provided at both end portions in the circumferential direction of the fixing tool 11 so as to be closely fixed to the outer peripheral surface of the rotor body 2. The fixing portions 12 and 13 are formed along the axial direction of the rotor body 2. Then, screws are inserted into a plurality of screw holes (through holes) formed in the fixing portions 12 and 13 (not shown), and the fixing tool 11 together with the permanent magnet 5A held inside is fixed to the rotor body 2 side. To be fixed to.

  In the fixing parts 12, 13, one fixing part 12 is formed at a position in close contact with the outer peripheral surface of the rotor main body 2, and the other fixing part 13 is the fixing part 13 of the other adjacent fixing tool 11. It is formed at a position that is in close contact with the front side surface. That is, in the adjacent fixtures 11, the fixing portion 13 of one fixing device 11 is provided so as to overlap the fixing portion 12 of the other fixing device 11, and the fixing portion 13 is the other adjacent fixing device 11. It is the structure which closely_contact | adheres to the outer peripheral surface of the rotor main body 2 through the fixing | fixed part 12. And the screw hole is provided in the position which mutually communicates in the fixing parts 12 and 13 which overlap, and when fixing the fixing tool 11 to the rotor main body 2, a screw is fixed to the fixing part 12 and the fixing part from the front side. 13 and is screwed to the rotor main body 2 side.

  Also in this embodiment, the fixing portion 13 of one fixing tool 11 is provided so as to overlap the fixing portion 12 of the other fixing device 11, but both the fixing portions 12 and 13 are the outer periphery of the rotor body 2. It may be formed at a position that is in direct contact with the surface.

  With the above configuration, when the permanent magnet 5A is fixed to the outer peripheral surface of the rotor body 2, the entire permanent magnet 5A is covered with the resin fixture 11, so that the fixing operation can be simplified and made permanent. The surface protection of the magnet 5A can be performed. In addition, the fixture 11 that holds the permanent magnet 5A inside is securely fixed to the rotor body 2 with screws, so that it can withstand a large centrifugal force and can be operated in a high-speed rotation range.

  FIG. 4 is a diagram illustrating another example of a configuration in which a permanent magnet is fixed to an outer peripheral surface of a rotor in a rotary electric motor according to the present invention. This also explains the fixing structure of the magnet part 4 and the rotor main body 2 in FIG. 1, and here also shows a fixing structure by itself.

  As shown in FIG. 4, in the present embodiment as well, in the same manner as in the second embodiment, a resin-made fixture 14 (covering member) is formed in advance so as to cover the entire outer periphery of the permanent magnet 5A constituting the magnet portion 4. The permanent magnet 5 </ b> A is embedded inside the fixture 14. When the permanent magnet 5A is disposed and fixed on the outer peripheral surface of the rotor body 2, the fixture 14 itself that holds the permanent magnet 5A inside is fixed to the outer peripheral surface of the rotor body 2. .

  That is, as in the second embodiment, the fixture 14 is formed by molding a resin so as to cover the entire permanent magnet 5A along the outer peripheral surface of the permanent magnet 5A having a dome-shaped cross section. In addition, fixing portions 12 and 13 are formed at both end portions in the circumferential direction of the fixing tool 14, and screws are inserted into a plurality of screw holes formed in the fixing portions 12 and 13 to be held inside. The fixing tool 14 is fixed to the rotor body 2 side together with the permanent magnet 5A.

  Furthermore, in the present embodiment, a protrusion 15 is provided on the lower surface of the fixing tool 14, that is, on the surface of the fixing tool 14 on the rotor main body 2 side, and prevents the centrifugal force from coming off. The protrusion 15 includes a tip portion 15a having a circular cross-sectional shape, and a support portion 15b that supports the tip portion 15a from the fixture 14 side and is narrower than the diameter of the tip portion 15a. That is, the tip portion 15a is formed larger than the support portion 15b that supports the tip portion 15a.

  And the groove | channel 16 of the same shape as the cross-sectional shape of the projection part 15 is provided in the rotor main body 2 side so that this projection part 15 may fit along the axial direction of the rotor main body 2. FIG. The bottom portion of the groove 16 has a circular cross-sectional shape in accordance with the shape of the tip portion 15a, and the portion from the inlet to the bottom portion of the groove 16 has a diameter of the tip portion 15a in accordance with the shape of the support portion 15b. The opening width is narrower. Therefore, when fixing the fixture 14 together with the permanent magnet 5 </ b> A to the rotor body 2, the end of the protrusion 15 of the fixture 14 is inserted into the groove 16 from the side end of the rotor body 2, and the groove 16. The fixing tool 14 is fitted and fixed to the rotor main body 2 by moving the fixing tool 14 in the axial direction of the rotor main body 2.

  With the above configuration, when the permanent magnet 5A is fixed to the outer peripheral surface of the rotor body 2, the entire permanent magnet 5A is covered with the resin fixture 14, so that the fixing operation can be simplified and permanent. The surface protection of the magnet 5A can be performed. Further, the fixture 14 that holds the permanent magnet 5A inside is securely fixed to the rotor body 2 by the protrusion 15 and the screw, so that it can withstand a large centrifugal force and can be operated in a high-speed rotation range. It becomes.

  FIG. 5 is a diagram showing another example of a configuration in which a permanent magnet is fixed to the outer peripheral surface of a rotor in the rotary electric motor according to the present invention. This also explains the fixing structure of the magnet part 4 and the rotor main body 2 in FIG. 1, and here also shows a fixing structure by itself.

  As shown in FIG. 5, in the present embodiment as well, in the same manner as in the second embodiment, a resin-made fixing member 17 (cover member) is formed in advance so as to cover the entire outer periphery of the permanent magnet 5 </ b> A constituting the magnet portion 4. The permanent magnet 5 </ b> A is embedded inside the fixture 17. When the permanent magnet 5A is disposed and fixed on the outer peripheral surface of the rotor body 2, the fixture 17 itself that holds the permanent magnet 5A inside is fixed to the outer peripheral surface of the rotor body 2. .

  That is, the fixing member 17 is formed by molding a resin so as to cover the entire permanent magnet 5A along the outer surface of the permanent magnet 5A having a dome-shaped cross section, as in the second embodiment. In addition, fixing portions 12 and 13 are formed at both end portions in the circumferential direction of the fixing tool 17, and screws are inserted into a plurality of screw holes formed in the fixing portions 12 and 13 to be held inside. The fixing tool 17 is fixed to the rotor body 2 side together with the permanent magnet 5A.

  Furthermore, in this embodiment, one or a plurality of protrusions 18 that prevent the centrifugal force from coming off are provided on the lower surface of the fixture 17, that is, the surface on the rotor body 2 side of the fixture 17. It has been. The projecting portion 18 has an arrow shape with a cross-sectional shape of an inverted triangle, and has a tip portion 18a made of a structure or material that can be deformed in the width direction. The tip portion 18a is a deformation of the tip portion 18a. In this configuration, the fixture 17 is supported by a support portion 18b having a width equal to the minimum width.

  Corresponding to the protrusion 18, one or more hollow holes 19 having a narrow opening width of the inlet portion 19 a and a wide opening width of the back portion 19 b are formed on the rotor body 2 side. The inlet portion 19a of the hollow hole 19 is formed to have an opening width that allows the tip portion 18a deformed to the minimum width to be inserted and that allows the tip portion 18a that extends in the width direction after being inserted through the inlet portion 19a to be hooked. ing. Further, the back portion 19b of the cavity hole 19 is formed with an opening width equal to or greater than the maximum width at which the tip end portion 18a can be deformed. Therefore, when fixing the fixing tool 17 together with the permanent magnet 5 </ b> A to the rotor body 2, the fixing tool 17 is rotated by inserting the protrusion 18 of the fixing tool 17 into the cavity hole 19 from the front side of the rotor body 2. It is fixed to the child body 2.

  With the above configuration, when the permanent magnet 5A is fixed to the outer peripheral surface of the rotor body 2, the entire permanent magnet 5A is covered with the resin fixture 17, so that simplification during fixing work can be achieved and the permanent magnet 5A can be made permanent. The surface protection of the magnet 5A can be performed. In addition, the fixture 17 that holds the permanent magnet 5A inside is securely fixed to the rotor body 2 by the protrusion 18 and screws, so that it can withstand a large centrifugal force and can be operated in a high-speed rotation range. It becomes.

  FIG. 6 is a diagram illustrating another example of a configuration in which a permanent magnet is fixed to an outer peripheral surface of a rotor in a rotary electric motor according to the present invention. This is to explain the fixing structure of the magnet part 4 and the rotor body 2 in FIG. 1, and shows a state in which a plurality of permanent magnets are arranged and fixed on the outer peripheral surface of the rotor body.

  As shown in FIG. 6, in this embodiment, when the permanent magnet 5A constituting the magnet portion 4 is arranged and fixed on the outer peripheral surface of the rotor body 2, the outer peripheral surface of the plurality of permanent magnets 5A (permanent magnets). In 5A, a resin-made annular fixture 20 that collectively covers the surface on the opposite side of the rotor body 2 is used. That is, with respect to the permanent magnets 5A of all poles, each permanent magnet 5A is covered by the annular fixture 20 from the front side of the permanent magnet 5A, and the annular fixture 20 is fixed to the rotor body 2. In other words, it is a structure in which the fixture 6 shown in the first embodiment is connected in an annular shape.

  In the present embodiment, similarly to the first embodiment, the annular fixture 20 is formed with a plurality of holding portions 20a in accordance with the shape of the permanent magnet 5A having a dome-shaped cross section. A hollow portion 20b having a dome cross-sectional shape is formed inside.

  Further, between the holding portions 20a, there is provided a fixing portion 21 that connects the holding portions 20a to each other and follows the shape of the outer peripheral surface of the rotor main body 2. The fixing portion 21 is provided on the rotor main body 2. It is formed along the axial direction. Then, screws are inserted into and screwed into a plurality of screw holes formed in the fixing portion 21, and the fixing portion 21 is closely fixed to the outer peripheral surface of the rotor body 2, thereby being held in the cavity portion 20 b. The annular fixture 20 is fixed to the rotor body 2 side together with the permanent magnet 5A.

  With the above configuration, when the permanent magnet 5A is fixed to the outer peripheral surface of the rotor body 2, the front side of the permanent magnet 5A is covered with the resin-made annular fixture 20, so that the surface of the permanent magnet 5A can be protected. Further, since the annular fixture 20 that holds the permanent magnet 5A is securely fixed to the rotor body 2 with screws, it can withstand a large centrifugal force and can be operated in a high-speed rotation range.

  The length of the annular fixture 20 in the longitudinal direction is preferably at least equal to the length of the permanent magnet 5A in the longitudinal direction, and more preferably equal to the length of the rotor body 2 in the axial direction. .

  Further, in the present embodiment, the configuration in which the fixture 6 shown in the first embodiment is connected in a ring shape is shown, but the single fixtures 11, 14, and 17 shown in the second to fourth embodiments are connected in a ring shape. It is good.

  Furthermore, in the present embodiment, the fixture is formed in an annular shape so as to cover all the permanent magnets 5A in a lump, but for each of a plurality of poles, for example, every 2 poles or 3 poles, A plurality of single fixtures 6, 11, 14, and 17 may be connected so as to cover the permanent magnet 5 </ b> A and fixed to the outer peripheral surface of the rotor body 2.

  FIG. 7 is a diagram illustrating another example of a configuration in which a permanent magnet is fixed to the outer peripheral surface of a rotor in the rotary electric motor according to the present invention. This explains the fixing structure of the magnet part 4 and the rotor body 2 in FIG. 1, FIG. 7 (a) shows a single fixing structure, and FIG. 7 (b) shows a single fixing structure. The state which has arranged two or more on the outer peripheral surface of a rotor main body is shown.

  As shown in FIGS. 7A and 7B, in this embodiment, when the permanent magnet 5B constituting the magnet portion 4 is arranged and fixed on the outer peripheral surface of the rotor main body 2, the outer peripheral side of the permanent magnet 5B. The resin fixing tool 30 (covering member) that covers the surface (the surface on the opposite side of the rotor body 2 in the permanent magnet 5A) is used. That is, the permanent magnet 5B is covered with the fixture 30 from the front side of the permanent magnet 5B, and the fixture 30 is fixed to the rotor body 2.

  In the fixture 30, a holding part 30a is formed in accordance with the shape of the permanent magnet 5B, and a hollow part 30b for holding the permanent magnet 5B is formed inside the holding part 30a. For example, if the cross-sectional shape is a trapezoidal permanent magnet 5B, a trapezoidal outer shape holding part 30a is formed in accordance with the shape, and a trapezoidal cross-sectional cavity 30b is formed inside the holding part 30a. Good. Further, the length of the fixture 30 in the longitudinal direction is equal to the length of the rotor body 2 in the axial direction.

  In addition, in the fixing device 30, one end portion and the other end portion in the axial direction are arranged in a direction parallel to the surface on one end side in the axial direction of the rotor body 2 and the surface on the other end side (the axis of the rotor body 2. (In a direction perpendicular to the direction), a fixed surface 31 is formed. The fixed surface 31 covers one end portion and the other end portion of the holding portion 30a in the axial direction, and a part thereof is one end of the rotor body 2. It is extended so that it may overlap with the surface on the side and the surface on the other end side. A plurality of screw holes 32 are formed in the intimate portion of the fixing surface 31. When fixing the fixing tool 30 to the rotor body 2 side, screws are inserted through the plurality of screw holes 32 in the axial direction, The permanent magnet 5B held in the cavity 30b is fixed by screwing and fixing the fixing tool 30 to the one end side surface and the other end side surface of the rotor body 2.

  With the above configuration, when the permanent magnet 5B is fixed to the outer peripheral surface of the rotor body 2, the front side of the permanent magnet 5B is covered with the resin fixture 30, so that the surface of the permanent magnet 5B can be protected. In addition, the fixing tool 30 that holds the permanent magnet 5B is securely fixed to the rotor body 2 with screws, so that it can withstand a large centrifugal force and can be operated in a high-speed rotation range.

  FIG. 8 is a diagram showing another example of a configuration in which a permanent magnet is fixed to the outer peripheral surface of a rotor in the rotary electric motor according to the present invention. This also explains the fixing structure of the magnet part 4 and the rotor main body 2 in FIG. 1, and here, the fixing structure of a single body is shown.

  As shown in FIG. 8, in this embodiment, a resin fixing tool 33 (covering member) is formed in advance so as to cover the entire outer periphery of the permanent magnet 5 </ b> B constituting the magnet unit 4. The permanent magnet 5B is held so as to be embedded therein. When the permanent magnet 5B is disposed and fixed on the outer peripheral surface of the rotor main body 2, the fixture 33 itself that holds the permanent magnet 5B inside is fixed to the rotor main body 2.

  In the present embodiment, the fixture 33 is formed by molding a resin along the outer surface of the permanent magnet 5B so as to cover the entire permanent magnet 5B. For example, if the cross-sectional shape is a trapezoidal permanent magnet 5B, the trapezoidal outer shape fixture 33 is formed in accordance with the shape. Further, the length of the fixture 33 in the longitudinal direction is equal to the length of the rotor body 2 in the axial direction. The surface of the fixture 33 that contacts the rotor main body 2 is preferably formed in a curved shape having the same radius as the rotor main body 2 so as to be in close contact with the outer periphery of the rotor main body 2.

  Further, in the fixture 33, one end and the other end in the axial direction are arranged in a direction parallel to the surface on one end side in the axial direction of the rotor body 2 and the surface on the other end side (the axis of the rotor body 2. (In a direction perpendicular to the direction), a fixed surface 34 is formed. The fixed surface 34 covers one end portion and the other end portion in the axial direction, and a part thereof is a surface on one end side of the rotor body 2. It is extended so that it may overlap with the surface of the other end side. A plurality of screw holes 32 are formed in the intimate part of the fixing surface 34. When fixing the fixing tool 33 to the rotor body 2 side, screws are inserted through the plurality of screw holes 32 in the axial direction, The permanent magnet 5B held inside is fixed by screwing and fixing the fixture 33 to the surface on one end side and the surface on the other end side of the rotor body 2.

  With the above configuration, when the permanent magnet 5B is fixed to the outer peripheral surface of the rotor body 2, the entire permanent magnet 5B is covered with the resin fixture 33, so that the fixing operation can be simplified and permanent. The surface of the magnet 5B can be protected. In addition, since the fixture 33 that holds the permanent magnet 5B is securely fixed to the rotor body 2 with screws, it can withstand a large centrifugal force and can be operated in a high-speed rotation range.

  FIG. 9 is a diagram illustrating another example of a configuration in which a permanent magnet is fixed to an outer peripheral surface of a rotor in a rotary electric motor according to the present invention. This also explains the fixing structure of the magnet part 4 and the rotor main body 2 in FIG. 1, and here also shows a fixing structure by itself.

  As shown in FIG. 9, in the present embodiment as well, in the same manner as in the seventh embodiment, a resin-made fixture 36 (cover member) is formed in advance so as to cover the entire outer periphery of the permanent magnet 5 </ b> B constituting the magnet portion 4. The permanent magnet 5 </ b> B is embedded inside the fixture 36. When the permanent magnet 5B is arranged and fixed on the outer peripheral surface of the rotor main body 2, the fixture 36 itself that holds the permanent magnet 5B inside is fixed to the rotor main body 2.

  That is, as in the seventh embodiment, the fixture 36 is formed by molding a resin so as to cover the entire permanent magnet 5B along the outer peripheral surface of the trapezoidal permanent magnet 5B. Similarly, fixing surfaces 34 are also formed at both ends in the axial direction of the fixture 36, and screws are inserted into a plurality of screw holes 32 formed in the fixing surface 34, screwed together, and fixed. By fixing the tool 36 to the surface on one end side and the surface on the other end side of the rotor main body 2, the permanent magnet 5B held inside is fixed.

  Furthermore, in the present embodiment, one or a plurality of protrusions 38 that prevent the centrifugal force from coming off are provided on the lower side surface of the fixture 36, that is, the surface on the rotor body 2 side of the fixture 36. It has been. The projecting portion 38 has an arrow shape whose cross-sectional shape is an inverted triangle shape, and has a tip portion 38a made of a structure or material that can be deformed in the width direction. The tip portion 38a is a deformation of the tip portion 38a. In this configuration, the fixture 36 is supported by a support portion 38b having a width equal to the minimum width.

  Corresponding to the protrusion 38, one or a plurality of hollow holes having a narrow opening width at the inlet portion and a wide opening width at the back portion are formed on the rotor body 2 side (in the fourth embodiment). (See cavity hole 19). The inlet portion of the hollow hole is formed with an opening width that allows the tip portion 38a deformed to the minimum width to be inserted, and allows the tip portion 38a that extends in the width direction after being inserted through the inlet portion to be hooked. Further, the inner portion of the cavity hole is formed with an opening width equal to or greater than the maximum width at which the tip end portion 38a can be deformed. Therefore, when fixing the fixing tool 36 to the rotor body 2 together with the permanent magnet 5B, the protrusion 36 of the fixing tool 36 is inserted into the cavity hole from the front side of the rotor body 2 so that the fixing tool 36 is moved to the rotor. It is fixed to the main body 2.

  With the above configuration, when the permanent magnet 5B is fixed to the outer peripheral surface of the rotor body 2, the entire permanent magnet 5B is covered with the resin fixture 36, so that simplification during fixing work can be achieved and the permanent magnet 5B can be made permanent. The surface of the magnet 5B can be protected. Further, the fixture 36 that holds the permanent magnet 5B inside is securely fixed to the rotor body 2 by the protrusion 38 and the screw, so that it can withstand a large centrifugal force and can be operated in a high-speed rotation range. It becomes.

  FIG. 10 is a diagram illustrating another example of a configuration in which a permanent magnet is fixed to an outer peripheral surface of a rotor in a rotary electric motor according to the present invention. This is to explain the fixing structure of the magnet part 4 and the rotor body 2 in FIG. 1, and shows a state in which a plurality of permanent magnets are arranged and fixed on the outer peripheral surface of the rotor body.

  As shown in FIG. 10, in this embodiment, when the permanent magnet 5B constituting the magnet portion 4 is arranged and fixed on the outer peripheral surface of the rotor body 2, the outer peripheral surface of the plurality of permanent magnets 5B (permanent magnets). In 5A, the resin-made annular fixture 39 which covers the surface on the opposite side to the rotor main body 2 in a lump is used. That is, with respect to the permanent magnets 5B having all the number of poles, each permanent magnet 5B is covered by the annular fixture 39 from the front side of the permanent magnet 5B, and the annular fixture 39 is fixed to the rotor body 2. In other words, it is a structure in which the fixture 30 shown in the sixth embodiment is connected in a ring shape.

  In the present embodiment, as in the sixth embodiment, the annular fixture 39 is formed with a plurality of holding portions 39a in accordance with the shape of the permanent magnet 5B having a trapezoidal cross section. A cavity 39b having a trapezoidal cross-sectional shape is formed inside. Similarly, a fixed surface 31 is formed at both axial ends of the annular fixture 39, and screws are inserted into and screwed into a plurality of screw holes 32 formed in the fixed surface 31, By fixing the annular fixture 39 to the surface on one end side and the surface on the other end side of the rotor body 2, the permanent magnet 5B held inside is fixed.

  Further, between the holding portions 39a, there is provided a connecting portion 41 that connects the holding portions 39a to each other and follows the shape of the outer peripheral surface of the rotor main body 2. It is formed along the axial direction. Note that a plurality of through holes may be provided in the connecting portion 41, and screws may be inserted into the through holes and screwed together to assist the fixing of the annular fixture 39 to the rotor body 2.

  With the above configuration, when the permanent magnet 5B is fixed to the outer peripheral surface of the rotor body 2, the front side of the permanent magnet 5B is covered with the resin-made annular fixture 39, so that the surface of the permanent magnet 5B can be protected. Further, since the annular fixture 39 that holds the permanent magnet 5B is securely fixed to the rotor body 2 by screws, it can withstand a large centrifugal force and can be operated in a high-speed rotation range.

  In this embodiment, the configuration in which the fixture 30 shown in the sixth embodiment is connected in a ring shape is shown. However, the single fixtures 33 and 36 shown in the seventh and eighth embodiments may be connected in a ring shape. Good.

  Furthermore, in the present embodiment, the fixture is formed in an annular shape so as to cover all the permanent magnets 5B of all the poles at once, but for each of a plurality of poles, for example, every two poles or three poles, A plurality of single fixing tools 33 and 36 may be connected so as to cover the permanent magnet 5 </ b> B and fixed to the rotor body 2.

It is a figure which shows the rotor of a rotary electric motor, (a) is a perspective view, (b) is an AA arrow directional cross-sectional view. In the rotary electric motor which concerns on this invention, it is a figure which shows an example (Example 1) which fixes a permanent magnet to a rotor outer peripheral surface. In the rotary electric motor which concerns on this invention, it is a figure which shows another example (Example 2) of a structure which fixes a permanent magnet to a rotor outer peripheral surface. In the rotary electric motor which concerns on this invention, it is a figure which shows another example (Example 3) which fixes a permanent magnet to a rotor outer peripheral surface. In the rotary electric motor which concerns on this invention, it is a figure which shows another example (Example 4) which fixes a permanent magnet to a rotor outer peripheral surface. In the rotary electric motor which concerns on this invention, it is a figure which shows another example (Example 5) which fixes a permanent magnet to a rotor outer peripheral surface. In the rotary electric motor which concerns on this invention, it is a figure which shows another example (Example 6) which fixes a permanent magnet to a rotor outer peripheral surface. In the rotary electric motor which concerns on this invention, it is a figure which shows another example (Example 7) which fixes a permanent magnet to a rotor outer peripheral surface. In the rotary electric motor which concerns on this invention, it is a figure which shows another example (Example 8) which fixes a permanent magnet to a rotor outer peripheral surface. In the rotary electric motor which concerns on this invention, it is a figure which shows another example (Example 9) which fixes a permanent magnet to a rotor outer peripheral surface. In the conventional rotary electric motor, it is a figure which shows the fixation structure of the magnet to a rotor outer peripheral surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 2 Rotor main body 3 Axis 4 Magnet part 5A, 5B Permanent magnet 6, 11, 14, 17 Fixing tool 7, 8, 12, 13 Fixing part 9 Through-hole 10 Screw 15 Projection part 16 Groove 18 Projection part 19 Cavity Hole 20 Annular fixture 21 Fixing part

Claims (6)

In the synchronous motor having a plurality of permanent magnets on the outer peripheral surface of the rotor,
A resin-made covering member that covers the outer peripheral surface of the permanent magnet when the permanent magnet is disposed on the outer peripheral surface of the rotor;
Fixing portions that are fixed to the outer peripheral surface of the rotor are provided at both end portions in the circumferential direction of the covering member, screws are inserted into the fixing portion, and the covering member and the permanent magnet are attached to the rotor. A synchronous motor comprising a plurality of through holes to be fixed. In the synchronous motor having a plurality of permanent magnets on the outer peripheral surface of the rotor,
A resin coating member that covers the entire permanent magnet is provided,
Fixing portions that are fixed to the outer peripheral surface of the rotor are provided at both end portions in the circumferential direction of the covering member, screws are inserted into the fixing portion, and the covering member and the permanent magnet are attached to the rotor. A synchronous motor comprising a plurality of through holes to be fixed. In the synchronous motor according to claim 2,
Provided on the surface of the covering member on the rotor side is a protrusion that has a tip that is larger than the portion that supports the tip,
A synchronous motor, wherein the rotor is provided with a groove into which the protrusion is fitted. In the synchronous motor according to claim 2,
While providing a protrusion having an arrow-shaped tip that can be deformed in the width direction on the surface of the covering member on the rotor side,
The synchronous motor according to claim 1, wherein the rotor is provided with a narrow cavity hole in which an end of the protruding portion can be inserted and an end of the inserted protruding portion is hooked. The synchronous motor according to any one of claims 1 to 4,
The fixing portion is provided between the adjacent covering members so that the fixing portion of one of the covering members overlaps the fixing portion of the other covering member,
The synchronous motor according to claim 1, wherein the through hole is provided at a position where the fixed portions overlap each other and communicate with each other. The synchronous motor according to any one of claims 1 to 4,
A synchronous motor, wherein the covering members are integrally formed in an annular shape.

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