JP5684529B2 - motor - Google Patents

Description

  The present invention relates to a continuous pole type motor.

  In the rotor provided in the continuous pole type motor, the magnet of one magnetic pole (that is, one of the N pole and the S pole) and the pseudo magnetic pole formed integrally with the rotor core are alternately arranged in the circumferential direction. (See Patent Document 1). The pseudo magnetic pole functions as a magnetic pole different from the magnet.

JP 9-327139 A

  However, although the pseudo magnetic pole functions as a magnetic pole different from the magnet provided in the rotor, it is not actually a magnet. The magnet provided in the rotor is arranged with respect to the rotor core so that one of the N pole and the S pole is directed radially outward, and the other is oriented radially inward. The magnetic flux is difficult to flow in the radial direction. Therefore, there has been a problem that the magnetic flux of the magnet leaks in the axial direction. And if the magnetic flux of a magnet flows also into the rotating shaft with which the rotor core was fixed, there exists a possibility that a rotating shaft may be magnetized. In general, the tip of the rotating shaft is often exposed to the outside of the motor. Therefore, when the tip of the rotating shaft is magnetized, there arises a problem that foreign matter adheres to the tip of the rotating shaft. . Therefore, it is desired to suppress the magnetization of the rotating shaft in the continuous pole type motor. Further, in a continuous pole type motor, it is also desired to suppress the axial drop-off of the magnet from the rotor core.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a continuous pole type motor capable of suppressing magnetic flux leakage in the axial direction and magnet axial fall-off. There is to do.

In order to solve the above-mentioned problem, the invention according to claim 1 rotates a rotor core having a motor case and a pseudo magnetic pole that is arranged inside the motor case and alternately arranged in the circumferential direction with a magnet of one magnetic pole. A rotor that is fixed to a shaft, formed of a non-magnetic material, and interposed between the rotor core and the rotating shaft so that the rotor core and the rotating shaft can rotate integrally. A covering fixing member having a fixing portion to be fixed and a covering portion covering at least a part of an end surface in the axial direction of the magnet, and the covering fixing member having the fixing portion and the covering portion respectively. The fixing portions of the covering fixing members respectively provided on both sides in the axial direction and provided on both sides in the axial direction of the rotor core are spaced apart in the axial direction and between the two fixing portions in the axial direction. Wherein during the outer peripheral surface of the rotary shaft and the inner peripheral surface of the rotor core is in its gist that the voids are formed.

  According to this configuration, the magnetic flux of the magnet can be made difficult to flow in the axial direction by interposing the fixing portion of the covering fixing member made of a non-magnetic material between the rotor core and the rotating shaft. Therefore, the magnetic flux of the magnet can be prevented from leaking in the axial direction and flowing into the rotating shaft. As a result, the magnetization of the rotating shaft can be suppressed. The covering fixing member has a covering portion that covers not only the fixing portion but also the end surface in the axial direction of the magnet. When the magnet comes into contact with the covering portion from the axial direction, further movement of the magnet in the axial direction is prevented by the covering portion. Therefore, the axial fall of the magnet from the rotor core is suppressed by the covering portion.

In addition, since the rotating shaft and the rotor core are fixed so as to be integrally rotatable through fixing portions of the covering fixing members arranged on both sides in the axial direction of the rotor core, the rotor core is stably fixed to the rotating shaft. Can do. In addition, since the covering portions are disposed on both sides of the magnet in the axial direction, the covering portions can prevent the magnet from falling off the rotor core in the axial direction.
The gist of the invention described in claim 2 is that, in the motor described in claim 1, the covering portion biases the magnet in the axial direction.
According to this configuration, the magnet is urged in the axial direction by the covering portion, so that movement in the axial direction is suppressed. Therefore, the axial displacement of the magnet with respect to the rotor core is suppressed.

  According to a third aspect of the present invention, in the motor according to the first or second aspect, the fixed portion protrudes toward the front end side of the pseudo magnetic pole at a central portion in the circumferential direction of the pseudo magnetic pole, and the pseudo The gist of the invention is to have a rectifying portion having a symmetrical shape with a center line passing through the center of the magnetic pole in the circumferential direction as the axis of symmetry.

  According to this configuration, the rectifying unit has a shape protruding toward the tip side of the pseudo magnetic pole at the center in the circumferential direction of the pseudo magnetic pole. Therefore, the magnetic flux of the magnet flows along the rectification unit inside the rotor core, so that between the magnets adjacent to the circumferential direction and the pseudo magnetic pole, from the side surface on the rotor core side of the magnet toward the tip of the pseudo magnetic pole, or It becomes easier to flow from the tip of the pseudo magnetic pole toward the side surface of the magnet on the rotor core side. In addition, since the rectification unit has a symmetrical shape with the center line passing through the center of the pseudo magnetic pole in the circumferential direction as the axis of symmetry, the magnetic flux flowing along the rectification unit inside the rotor core is on both sides of the center line (both sides in the circumferential direction). ) Will flow in the same way. From these things, the leakage of the magnetic flux in the axial direction can be further suppressed. Further, since the rectifying portion has a shape protruding toward the tip side of the pseudo magnetic pole, the rotor core is prevented from idling relative to the fixed portion.

  ADVANTAGE OF THE INVENTION According to this invention, the continuous pole type | mold motor which can suppress the axial fall of a magnet while suppressing the leakage of the magnetic flux in the axial direction can be provided.

Sectional drawing of a motor. The disassembled perspective view of the rotor in 1st Embodiment. (A) is a disassembled perspective view of the rotor in 2nd Embodiment, (b) is a side view of the rotor in 2nd Embodiment. (A) And (b) is sectional drawing of the rotor in another embodiment. Sectional drawing of the rotor in another embodiment. Sectional drawing of the rotor in another embodiment. (A) is sectional drawing of the rotor in another embodiment, (b) is a perspective view of the covering fixing member in another embodiment. (A) is a disassembled perspective view of the rotor in another embodiment, (b) is sectional drawing of the rotor in another embodiment.

(First embodiment)
A first embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 shows a motor of this embodiment. This motor is an inner rotor type brushless motor and a continuous pole type motor. The motor is formed inside the motor case 1 by accommodating the stator 2 and the rotor 3.

  The motor case 1 includes a bottomed cylindrical case body 5 and a substantially disc-shaped cover plate 6 that closes an opening of the case body 5. A cylindrical stator 2 is fixed to the inner peripheral surface of the case body 5, and a rotor 3 is disposed inside the stator 2.

The rotor 3 includes a rotation shaft 11, a rotor core 12, a magnet 13, and a covering fixing member 14.
A base end portion (left end portion in FIG. 1) of the columnar rotating shaft 11 is pivotally supported by a bearing 16 provided at the bottom center of the case body 5, while a portion on the distal end side of the rotating shaft 11. Is supported by a bearing 17 provided at the radial center of the cover plate 6. Further, the distal end portion of the rotating shaft 11 passes through the central portion in the radial direction of the cover plate 6 and protrudes (exposes) outside the motor case 1.

  As shown in FIG. 2, the rotor core 12 is made of a magnetic material and has a cylindrical shape. A press-fit hole 12a that penetrates the rotor core 12 in the axial direction is formed in the central portion in the radial direction of the rotor core 12, and the inner diameter of the press-fit hole 12a is larger than the outer diameter of the rotary shaft 11. ing. Further, the rotor core 12 is formed with holding holes 12b penetrating the rotor core 12 in the axial direction at four positions on the outer peripheral side of the press-fitting hole 12a and at equal circumferential intervals (90 ° intervals in the present embodiment). Has been. By forming these four holding holes 12b, pseudo magnetic poles 12c are formed in the rotor core 12 between the holding holes 12b.

  The inner peripheral surface of each holding hole 12b is composed of four surfaces. On the inner peripheral surface of the holding hole 12b, the inner peripheral side surface 12d on the radially inner side has a planar shape that is orthogonal to the radial direction and parallel to the axial direction at the center in the circumferential direction. Further, the outer peripheral side surface 12e on the radially outer side on the inner peripheral surface of the holding hole 12b has an arc shape that is concentric with the cylindrical outer peripheral surface 12f of the rotor core 12. Furthermore, the circumferential side surfaces 12g on both sides in the circumferential direction on the inner circumferential surface of the holding hole 12b form a plane shape parallel to the axial direction, and are spaced from each other in the radial direction so as to increase in distance from each other toward the radially outer side. Is inclined.

  The four pseudo magnetic poles 12c provided on the rotor core 12 extend along the radial direction and protrude outward in the radial direction from the inner peripheral side surface 12d of each holding hole 12b. Each of the pseudo magnetic poles 12c has a constant width in the circumferential direction from the proximal end portion on the inner peripheral side to the distal end portion on the outer peripheral side, and is provided from one end to the other end in the axial direction of the rotor core 12. .

  Magnets 13 are inserted into the four holding holes 12b of the rotor core 12, respectively. Each magnet 13 has a substantially rectangular parallelepiped shape that is long in the axial direction of the rotor core 12, and the axial length thereof is equal to the axial length of the rotor core 12. In addition, each magnet 13 has a constant cross-sectional shape perpendicular to the axial direction along the axial direction, and both axial end surfaces of each magnet 13 are in the axial direction of the rotor core 12 at both axial ends of the rotor core 12. Each end face is located in the same plane. The circumferential width of each magnet 13 is equal to the circumferential width of the inner circumferential side surface 12d of the holding hole 12b. In addition, the radially inner side surface 13a of each magnet 13 has a planar shape that is the same size as the inner peripheral side surface 12d of the holding hole 12b, and abuts against the inner peripheral side surface 12d of the holding hole 12b. Further, the radially outer side surface 13b of each magnet 13 has an arc shape with the same curvature as the outer peripheral side surface 12e of the holding hole 12b, and abuts on the outer peripheral side surface 12e of the holding hole 12b. Further, since the side surfaces 13c on both sides in the circumferential direction of each magnet 13 and the circumferential side surface 12g opposed to the side surfaces 13c in the circumferential direction are spaced apart in the circumferential direction, a gap is formed between them.

  These magnets 13 are magnetized such that the radially outer side surface 13b side is an N pole and the radially inner side surface 13a side is an S pole. Therefore, in the rotor 3 of the present embodiment, four magnets 13 having N poles among the S poles and N poles are arranged in the circumferential direction with respect to the rotor core 12. Then, by inserting each magnet 13 into the holding hole 12b, the pseudo magnetic pole 12c is disposed between the magnets 13 adjacent in the circumferential direction, and as a result, the N-pole magnet 13 and the pseudo magnetic pole 12c are circumferentially arranged. Are alternately arranged. By arranging the magnet 13 in this way with respect to the rotor core 12 having the pseudo magnetic pole 12c, the pseudo magnetic pole 12c functions as an S pole in a pseudo manner.

  The covering fixing member 14 is made of a non-magnetic material and includes a fixing portion 14a and a pair of covering portions 14b and 14c (a first covering portion 14b and a second covering portion 14c).

  The fixed portion 14 a has a cylindrical shape, and the length in the axial direction is slightly longer than the length in the axial direction of the rotor core 12. In addition, the outer diameter of the fixed portion 14a is formed to be equal to or slightly larger than the inner diameter of the press-fitting hole 12a formed in the central portion of the rotor core 12 in the radial direction. It is formed to be equal to or slightly smaller than the inner diameter.

  One first covering portion 14b of the pair of covering portions 14b, 14c is formed integrally with one end portion (right end portion in FIG. 2) of the fixing portion 14a in the axial direction. The first covering portion 14b extends in a bowl shape from one end portion in the axial direction of the fixed portion 14a toward the radially outer side, and has an annular plate shape. The outer diameter of the first covering portion 14 b is formed to be equal to the outer diameter of the rotor core 12.

  The other second covering portion 14c of the pair of covering portions 14b and 14c has the same shape as the first covering portion 14b. That is, the second covering portion 14c has an annular plate shape. Further, the outer diameter of the second covering portion 14c is formed to be equal to the outer diameter of the rotor core 12, and the inner diameter of the second covering portion 14c is formed to be equal to or slightly smaller than the outer diameter of the fixed portion 14a.

  As shown in FIG. 1, the rotating shaft 11 is press-fitted inside the fixed portion 14a in which the first covering portion 14b is integrally formed, so that the fixed portion 14a, the first covering portion 14b, and the rotating shaft are pressed. 11 is fixed so as to be integrally rotatable. The fixed portion 14 a is fixed to a portion closer to the base end portion than the central portion in the axial direction of the rotary shaft 11 with respect to the rotary shaft 11. Further, the rotor core 12 is fitted on the fixing portion 14 a fixed to the rotating shaft 11. The fixing portion 14 a is fixed so as to be rotatable together with the rotor core 12 by being press-fitted into the press-fitting hole 12 a of the rotor core 12. Therefore, the rotating shaft 11 and the rotor core 12 are fixed so as to be integrally rotatable via the fixing portion 14a, and the fixing portion 14a is interposed between the outer peripheral surface of the rotating shaft 11 and the inner peripheral surface of the rotor core 12. ing. Further, the end surface in the axial direction of the first covering portion 14b on the rotor core 12 side is in contact with one axial end surface (the right end surface in FIG. 1) of the rotor core 12 from the axial direction, and each magnet held by the rotor core 12 13 is also in contact with one axial end surface (the right end surface in FIG. 1). Further, the first covering portion 14 b covers the entire axial end surface of the rotor core 12 and the entire axial end surface of each magnet 13. Further, the end portion in the axial direction of the fixed portion 14a opposite to the first covering portion 14b protrudes in the axial direction from the other end surface in the axial direction of the rotor core 12 (the left end surface in FIG. 1).

  And the 2nd coating | coated part 14c is externally fitted by the site | part which protruded from the rotor core 12 in the axial direction on the opposite side to the 1st coating | coated part 14b in the fixing | fixed part 14a. The second covering portion 14c is fixed so as to be integrally rotatable with the fixing portion 14a by press-fitting an axial end of the fixing portion 14a opposite to the first covering portion 14b on the inner side thereof. Yes. The axial end surface of the second covering portion 14c on the rotor core 12 side is in contact with the other axial end surface (the left end surface in FIG. 1) of the rotor core 12 from the axial direction, and each magnet held by the rotor core 12 is retained. 13 is also in contact with the other axial end surface (left end surface in FIG. 1). Further, the second covering portion 14 c covers the entire other axial end surface of the rotor core 12 and the entire other axial end surface of each magnet 13.

  The rotor core 12 fixed to the rotating shaft 11 via the fixing portion 14a faces the stator 2 in the radial direction inside the motor case 1. In such a rotor 3, the first covering portion 14 b and the second covering portion 14 c disposed on both sides in the axial direction of the rotor core 12 abut against both axial end surfaces of each magnet 13 from the axial direction, and each magnet 13. Therefore, the first covering portion 14b and the second covering portion 14c prevent the magnets 13 from falling off from the rotor core 12 in the axial direction. Further, since a fixing portion 14a made of a non-magnetic material is interposed between the inner peripheral surface of the rotor core 12 holding the magnet 13 and the outer peripheral surface of the rotating shaft 11, the N pole of each magnet 13 is radially outward. The magnetic flux that has flowed out flows in the axial direction, passes through the rotary shaft 11, and does not easily follow the path that flows from the rotor core 12 to the south pole of the magnet 13. That is, since the fixed portion 14a made of a nonmagnetic material is interposed between the rotor core 12 and the rotating shaft 11, leakage of magnetic flux in the axial direction can be suppressed.

  Further, an annular sensor magnet 19 is fixed to the rotary shaft 11 so as to be integrally rotatable with the rotary shaft 11 at a position between the front end surface of the rotary shaft 11 (the right end surface in FIG. 1) and the rotor core 12. Has been. The sensor magnet 19 is magnetized so that the N pole and the S pole are alternately arranged in the circumferential direction.

  A circuit board 21 on which circuit elements (not shown) for controlling the motor are mounted is fixed to the inner side surface of the cover plate 6. On the circuit board 21, a hall sensor 22 is disposed at a position facing the sensor magnet 19 in the axial direction. The hall sensor 22 is a hall IC provided with a hall element. The circuit board 21 is electrically connected to a drive control circuit (not shown) provided outside the motor.

  In the motor, when power is supplied to the stator 2, the rotor 3 is rotated according to the rotating magnetic field generated in the stator 2. The Hall sensor 22 that is axially opposed to the sensor magnet 19 that rotates integrally with the rotating shaft 11 of the rotor 3 detects a change in the magnetic field of the sensor magnet 19 and uses a pulse signal corresponding to the detected change in the magnetic field. A rotation detection signal is output to the drive control circuit. The drive control circuit detects rotation information (rotation speed, rotation position, etc.) of the rotor 3 based on the rotation detection signal. Then, the drive control circuit controls the power supplied to the stator 2 based on the detected rotation information of the rotor 3 so that the rotation speed of the rotor 3 becomes a desired rotation speed. Accordingly, power is supplied from the drive control circuit to the stator 2 in accordance with the rotational state of the rotor 3.

As described above, according to the first embodiment, the following operational effects can be achieved.
(1) By interposing the fixing portion 14a of the covering fixing member 14 made of a non-magnetic material between the rotor core 12 and the rotating shaft 11, the magnetic flux of the magnet 13 can be made difficult to flow in the axial direction. Therefore, the magnetic flux of the magnet 13 can be prevented from leaking in the axial direction and flowing into the rotating shaft 11. As a result, the magnetization of the rotating shaft 11 can be suppressed. The covering fixing member 14 includes not only a fixing portion 14 a that fixes the rotor core 12 to the rotating shaft 11 but also a first covering portion 14 b and a second covering portion 14 c that cover the end surface of the magnet 13 in the axial direction. When the magnet 13 comes into contact with the covering portions 14b and 14c from the axial direction, further movement of the magnet 13 in the axial direction is prevented by the covering portions 14b and 14c. Accordingly, the axial fall of the magnet 13 from the rotor core 12 is suppressed by the first covering portion 14b and the second covering portion 14c.

  (2) The magnet 13 from the rotor core 12 is formed by the first covering portion 14b provided on one side of the rotor core 12 in the axial direction and the second covering portion 14c provided on the other side of the rotor core 12 in the axial direction. Axial dropout can be prevented.

  (3) The fixed portion 14 a is interposed between the rotor core 12 and the rotating shaft 11 in any part of the rotor core 12 in the axial direction. Therefore, the magnetic resistance between the rotor core 12 and the rotating shaft 11 can be made constant in the axial direction. As a result, in the rotor core 12, it is possible to suppress the magnetic flux density from being biased in the axial direction.

  (4) Since the fixed portion 14a penetrates the rotor core 12 in the axial direction, the entire inner peripheral surface of the rotor core 12 is pressed against the outer peripheral surface of the fixed portion 14a. Therefore, the rotor core 12 can be firmly fixed to the fixing portion 14a so as to be integrally rotatable.

  (5) The entire axial end faces of the rotor core 12 and the entire axial end faces of the magnet 13 are covered by the first covering portion 14b and the second covering portion 14c. Accordingly, the magnetic flux is prevented from leaking from both axial end surfaces of the rotor core 12 and the axial end surfaces of the magnet 13.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  A rotor 31 according to the second embodiment shown in FIG. 3A is provided in a motor in place of the rotor 3 according to the first embodiment (see FIG. 1). The rotor 31 of the second embodiment includes a covering fixing member 32 in place of the covering fixing member 14 (see FIG. 2) of the first embodiment.

The covering fixing member 32 is made of a nonmagnetic material, and includes a fixing portion 14a and a pair of first covering portion 32a and second covering portion 32b.
The first covering portion 32a is formed integrally with one end portion in the axial direction of the fixed portion 14a (the right end portion in FIG. 3A). The first covering portion 32 a includes four extending portions 32 c that are the same number as the magnets 13 held by the rotor core 12. Each extending portion 32c extends radially outward from four locations that are equiangularly spaced in the circumferential direction (90 ° intervals in the present embodiment) at one end in the axial direction of the fixed portion 14a. It has a plate shape. As shown in FIG. 3B, each extending portion 32 c extends from the outer peripheral surface of the fixed portion 14 a to the outer peripheral surface 12 f of the rotor core 12 along the radial direction, and the width in the circumferential direction is the circumference of the magnet 13. It is formed narrower than the width in the direction.

  As shown in FIG. 3A, the second covering portion 32b includes the four extending portions 32c similarly to the first covering portion 32a, and an annular connecting portion that connects the four extending portions 32c. 32d. The inner diameter of the coupling portion 32d is formed to be equal to or slightly smaller than the outer diameter of the fixed portion 14a. Further, the four extending portions 32c connected by the connecting portion 32d are equiangularly spaced in the circumferential direction (90 ° intervals in the present embodiment). The outer diameter of the second covering portion 32b (that is, the diameter of a circle passing through the tip of the extending portion 32c) is formed to be equal to the outer diameter of the rotor core 12.

  The rotary shaft 11 is press-fitted inside the fixed portion 14a in which the first covering portion 32a is integrally formed, so that the fixed portion 14a, the first covering portion 32a, and the rotary shaft 11 are fixed so as to be integrally rotatable. Has been. Further, the fixing portion 14a fixed to the rotating shaft 11 is press-fitted into the press-fitting hole 12a of the rotor core 12, so that the rotating shaft 11 and the rotor core 12 are fixed so as to be integrally rotatable via the fixing portion 14a. Yes. Therefore, the fixed portion 14 a is interposed between the outer peripheral surface of the rotating shaft 11 and the inner peripheral surface of the rotor core 12.

  The rotor core 12 is externally fitted to the fixed portion 14a so that the circumferential positions of the four magnets 13 held coincide with the circumferential positions of the four extending portions 32c of the first covering portion 32a. . The four extending portions 32c of the first covering portion 32a are in contact with one end surface in the axial direction of the four magnets 13 (the right end surface in FIG. 3A), and each magnet 13 faces in the axial direction. The one end surface of the axial direction is partially covered.

  In addition, the connecting portion 32d of the second covering portion 32b is externally fitted to an axial end portion of the fixed portion 14a opposite to the first covering portion 32a and protruding from the rotor core 12 in the axial direction. ing. The second covering portion 32b can be integrally rotated with respect to the fixed portion 14a by press-fitting an axial end of the fixed portion 14a opposite to the first covering portion 32a inside the connecting portion 32d. It is fixed. The second covering portion 32b is externally fitted to the fixed portion 14a so that the circumferential positions of the four extending portions 32c coincide with the circumferential positions of the four magnets 13 held by the rotor core 12. Yes. The four extending portions 32c of the second covering portion 32b are in contact with the other axial end surfaces of the four magnets 13 (the left end surface in FIG. 3A) and are respectively opposed in the axial direction. The other end surface in the axial direction is partially covered.

  In such a rotor 31, the four extending portions 32 c of the first covering portion 32 a and the four extending portions 32 c of the second covering portion 32 b arranged on both sides in the axial direction of the rotor core 12 are formed by the four magnets 13. The magnets 13 are held in contact with both axial end surfaces from the axial direction. Accordingly, the first covering portion 32a and the second covering portion 32b prevent the magnets 13 from falling off from the rotor core 12 in the axial direction. Further, since a fixing portion 14a made of a non-magnetic material is interposed between the inner peripheral surface of the rotor core 12 holding the magnet 13 and the outer peripheral surface of the rotating shaft 11, the N pole of each magnet 13 is radially outward. The magnetic flux that has flowed out flows in the axial direction, passes through the rotary shaft 11, and does not easily follow the path that flows from the rotor core 12 to the south pole of the magnet 13. In other words, since the fixed portion 14a made of a nonmagnetic material is interposed between the rotor core 12 and the rotating shaft 11, it is possible to suppress the leakage of magnetic flux in the axial direction.

As described above, according to the second embodiment, the following operational effects can be achieved in addition to the operational effects similar to (1) to (5) of the first embodiment.
(6) The first covering portion 32a and the second covering portion 32b are not shaped so as to cover the entire axial end surface of the rotor core 12 and the entire axial end surface of the magnet 13, but partially the axial end surface of the magnet 13. It is formed in a shape that covers. Therefore, the material for forming the covering fixing member 32 is less than that of the covering fixing member provided with the covering portion that covers the entire axial end face of the rotor core 12 and the entire axial end face of the magnet 13. Therefore, since material costs can be suppressed, manufacturing costs can be reduced.

Each embodiment of the present invention may be modified as follows.
In the first embodiment, the covering fixing includes one fixing portion 14a penetrating the rotor core 12 in the axial direction and the first covering portion 14b and the second covering portion 14c disposed at both ends of the rotor core 12 in the axial direction. A member 14 is provided in the rotor 3. Moreover, in the said 2nd Embodiment, the coating | cover which has one fixing | fixed part 14a which penetrates the rotor core 12 to an axial direction, and the 1st coating | coated part 32a and the 2nd coating | coated part 32b arrange | positioned at the both ends of the axial direction of the rotor core 12. A fixing member 32 is provided on the rotor 31. However, the covering fixing members each having a fixing portion that fixes the rotor core 12 to the rotary shaft 11 so as to be integrally rotatable and a covering portion that covers at least a part of the axial end surface of the magnet 13 are provided in the axial direction of the rotor core 12. Each may be provided on both sides.

  For example, in the example shown in FIG. 4A, the covering fixing members each having a fixing portion 41 a that fixes the rotor core 12 to the rotating shaft 11 so as to be integrally rotatable, and a covering portion 41 b that covers the axial end surface of the magnet 13. 41 are respectively arranged on both sides of the rotor core 12 in the axial direction. In FIG. 4A, the same components as those in the first embodiment are denoted by the same reference numerals. Each covering fixing member 41 is formed of a nonmagnetic material and has the same shape as each other. The fixing portion 41 a of each covering fixing member 41 has a cylindrical shape, and its length is slightly longer than one half of the axial length of the rotor core 12. Further, the outer diameter of the fixed portion 41 a is formed to be equal to or slightly larger than the inner diameter of the press-fitting hole 12 a formed in the central portion in the radial direction of the rotor core 12, and the inner diameter of the fixed portion 41 a is the inner diameter of the rotating shaft 11. Is formed to be equal to or slightly smaller. Further, the covering portion 41b of each covering fixing member 41 is formed integrally with one end portion in the axial direction of the fixing portion 41a and has the same shape as the first covering portion 14b of the first embodiment.

  Each covering fixing member 41 is fixed so as to be rotatable together with the rotor core 12 by pressing the fixing portions 41a into the press-fitting holes 12a from both axial sides of the rotor core 12. At this time, the fixing portion 41a of each covering fixing member 41 is press-fitted into the press-fitting hole 12a from the end in the axial direction opposite to the covering portion 41b, and the covering portion of each fixing portion 41a within the press-fitting hole 12a. The end faces in the axial direction opposite to 41b abut. At the same time, the covering portion 41b of each covering fixing member 41 abuts on the axial end surface of the rotor core 12 and the axial end surface of each magnet 13 on both sides in the axial direction of the rotor core 12, and further in the axial direction of the rotor core 12. The entire end surface and the entire end surface in the axial direction of each magnet 13 are covered. Then, when the rotary shaft 11 is press-fitted into the fixing portion 41a of each covering fixing member 41, the rotor core 12 is fixed to the rotary shaft 11 so as to be integrally rotatable with the rotary shaft 11 via the two fixing portions 41a. Is done.

  Even if it does in this way, the effect similar to (1) thru | or (3) and (5) of the said 1st Embodiment can be acquired. Furthermore, since the rotating shaft 11 and the rotor core 12 are fixed so as to be integrally rotatable via the fixing portions 41 a of the covering fixing member 41 disposed on both sides of the rotor core 12 in the axial direction, the rotor core 12 is fixed to the rotating shaft 11. Can be fixed stably. Further, since the covering portions 41b are disposed on both sides of the magnet 13 in the axial direction, the covering portions 41b can prevent the magnet 13 from dropping off from the rotor core 12 in the axial direction. Further, since the two covering fixing members 41 arranged on both sides in the axial direction of the rotor core 12 have the same shape, the manufacturing cost can be reduced as compared with the case where a plurality of types of covering fixing members are formed. Furthermore, the entire inner peripheral surface of the rotor core 12 is pressed against the outer peripheral surfaces of the two fixing portions 41a. Therefore, the rotor core 12 can be firmly fixed to the fixing portion 41a so as to be integrally rotatable.

  Further, like the covering fixing member 42 shown in FIG. 4B, the axial length of the fixing portion 42 a may be shorter than one half of the axial length of the rotor core 12. In FIG. 4B, the same components as those in the first embodiment are denoted by the same reference numerals. In this case, the fixing portions 42a of the respective covering fixing members 42 press-fitted into the press-fitting holes 12a from both axial sides of the rotor core 12 are separated from each other in the axial direction. A gap 43 is formed between the end surface in the axial direction on the opposite side of the covering portion 41 b in each fixed portion 42 a and between the outer peripheral surface of the rotating shaft 11 and the inner peripheral surface of the rotor core 12. The space 43 is filled with air.

  Even if it does in this way, the effect similar to (1) of the said 1st Embodiment, (2), and (5) can be acquired. Furthermore, since the rotating shaft 11 and the rotor core 12 are fixed so as to be integrally rotatable at both ends in the axial direction of the rotor core 12 via the fixing portions 42a, the rotor core 12 can be stably fixed to the rotating shaft 11. Can do. Further, since the covering portions 41b are disposed on both sides of the magnet 13 in the axial direction, the covering portions 41b can prevent the magnet 13 from dropping off from the rotor core 12 in the axial direction. In addition, an air layer is formed by providing a gap 43 between the rotary shaft 11 and the rotor core 12. Therefore, since the magnetic resistance between the rotating shaft 11 and the rotor core 12 is increased, it is difficult for the magnetic flux to flow in the radial direction from the rotating shaft 11 to the rotor core 12 or from the rotor core 12 to the rotating shaft 11. The magnetic flux that flows radially outward from the N pole of the magnet 13 flows in the axial direction, passes through the rotating shaft 11, and further follows a path that flows from the rotor core 12 to the S pole of the magnet 13. Therefore, it is possible to further suppress the magnetic flux of the magnet 13 from leaking in the axial direction and flowing into the rotating shaft 11, and further suppress the magnetization of the rotating shaft 11. Further, since the two covering fixing members 42 arranged on both sides in the axial direction of the rotor core 12 have the same shape, the manufacturing cost can be reduced as compared with the case where a plurality of kinds of covering fixing members are formed. Furthermore, by forming the fixing portions 42a of the two covering fixing members 42 shorter than the fixing portions 41a and providing the gaps 43 between the fixing portions 42a, it is possible to reduce the material forming the covering fixing members 42. it can. Therefore, the manufacturing cost can be further reduced.

  In the covering fixing members 41 and 42 shown in FIGS. 4A and 4B, the covering portion 41b may have the same shape as the first covering portion 32a of the second embodiment. If it does in this way, the effect similar to (6) of the said 2nd Embodiment can be acquired. Further, the covering fixing members disposed on both sides of the rotor core 12 in the axial direction do not necessarily have the same shape.

  In each of the above embodiments, the first covering portions 14b and 32a and the second covering portions 14c and 32b are provided on both sides of the rotor core 12 in the axial direction. However, the first covering portions 14b and 32a or the second covering portions 14c and 32b may be provided only on one side of the rotor core 12 in the axial direction. For example, when one end in the axial direction of the holding hole 12b into which the magnet 13 is inserted is closed by the material constituting the rotor core 12, the first covering portions 14b, 32a or only on the opening side of the holding hole 12b The second covering portions 14c and 32b may be provided. Moreover, you may provide the 1st coating | coated parts 14b and 32a or the 2nd coating | coated parts 14c and 32b only in the one side of the axial direction of the rotor core 12 according to the attitude | position when a motor is used. In other words, the first covering portions 14b and 32a or the second covering portions 14c and 32b may be provided so as to be adjacent to the axial end portion on the lower side of the both sides in the axial direction of the rotor core 12 depending on the posture of the motor. Good.

  In place of the rotors 3 and 31 in the above embodiments, the motor may include the rotor 51 shown in FIG. 5 or the rotor 61 shown in FIG. In FIGS. 5 and 6, the same components as those in the first embodiment are denoted by the same reference numerals.

  A rotor 51 shown in FIG. 5 includes a rotating shaft 11, a rotor core 52, four magnets 13, a magnet cover 53, and a covering fixing member 54. The rotor core 52 includes a cylindrical fixed portion 52a and four pseudo magnetic poles 52b that protrude radially outward from the fixed portion 52a. The fixed portion 52a has a square cylindrical shape, and the press-fit hole 52c penetrating in the axial direction through the radial center of the fixed portion 52a has a square shape when viewed from the axial direction. In addition, relief grooves 52d extending along the axial direction are formed at the four corners of the press-fit holes 52c while being recessed outward in the radial direction. In addition, the four pseudo magnetic poles 52b are four positions that are equiangularly spaced in the circumferential direction (90 ° intervals in this example) in the fixed portion 52a, and are positions that are radially outward of the four escape grooves 52d. Is formed. Each of the four relief grooves 52d is located on a center line L1 passing through the center in the circumferential direction of the pseudo magnetic pole 52b located on the radially outer side. Furthermore, a magnet fixing surface 52e is formed between the four pseudo magnetic poles 52b on the outer peripheral surface of the fixed portion 52a. The four magnet fixing surfaces 52e are formed at equiangular intervals (90 ° intervals in this example) in the circumferential direction and have a planar shape parallel to the axial direction. A magnet 13 is arranged on each magnet fixing surface 52e, and a magnet cover made of metal (for example, a metal that is a non-magnetic material) is formed on the outer periphery of the rotor core 52 on which the magnet 13 is arranged. 53 is externally fitted. The rotor core 52 and the magnet 13 are press-fitted with a light force inside the magnet cover 53. Each magnet 13 is sandwiched and held by the inner peripheral surface of the magnet cover 53 and the magnet fixing surface 52e. Further, the magnet cover 53 prevents the magnet 13 from moving outward in the radial direction.

  The covering fixing member 54 made of a non-magnetic material includes a cylindrical fixing portion 54a and a first covering portion 14b (or first covering portion) (not shown) formed integrally with one end portion in the axial direction of the fixing portion 54a. 32a) and a second covering portion 14c (or second covering portion 32b) (not shown) fixed integrally to the other end portion in the axial direction of the fixing portion 54a.

  The fixing portion 54a has a quadrangular prism shape corresponding to the press-fitting hole 52c of the rotor core 52, and is provided with a fixing hole 54b penetrating in the axial direction at the central portion in the radial direction. The inner diameter of the fixed hole 54 b is formed to be equal to or slightly smaller than the outer diameter of the rotating shaft 11. In addition, the fixed portion 54a has a rectangular columnar shape, and has rectifying portions 54c that protrude radially outward at four locations that are equiangularly spaced in the circumferential direction (90 ° intervals in this example).

  The covering fixing member 54 is fixed so as to be integrally rotatable with the rotating shaft 11 by press-fitting the rotating shaft 11 into the fixing hole 54b of the fixing portion 54a. Further, the rotor core 52 is fitted on the fixing portion 54a (that is, the fixing portion 54a is press-fitted into the press-fitting hole 52c of the rotor core 52), thereby holding the rotary shaft 11 and the magnet 13 via the fixing portion 54a. The rotor core 52 is fixed so as to be integrally rotatable. And in the fixing | fixed part 54a press-fit in the press-fit hole 52c of the rotor core 52, the front-end | tip part of the radial direction outer side of each rectification | straightening part 54c is each inserted in the escape groove | channel 52d. Further, each rectifying portion 54c protrudes toward the tip side of the pseudo magnetic pole 52b at the circumferential center of each pseudo magnetic pole 52b, and has a symmetrical shape with the center line L1 passing through the center of the pseudo magnetic pole 52b in the circumferential direction as a symmetry axis. I am doing.

  In this way, the rectifying unit 54c has a shape protruding toward the tip of the pseudo magnetic pole 52b at the circumferential center of the pseudo magnetic pole 52b. Therefore, the magnetic flux of the magnet 13 flows along the rectifying portion 54 c inside the rotor core 52, so that the pseudo magnetic pole from the side surface of the magnet 13 on the rotor core 52 side between the magnet 13 and the pseudo magnetic pole 52 b adjacent in the circumferential direction. It becomes easy to flow toward the tip of 52b. Alternatively, the magnetic flux of the magnet 13 flows along the rectifying unit 54c inside the rotor core 52, so that the rotor core 52 in the magnet 13 from the tip of the pseudo magnetic pole 52b between the magnet 13 and the pseudo magnetic pole 52b adjacent in the circumferential direction. It becomes easy to flow toward the side of the side. Further, since the rectifying unit 54c has a symmetric shape with the center line L1 passing through the center in the circumferential direction of the pseudo magnetic pole 52b as a symmetric axis, the magnetic flux flowing along the rectifying unit 54c inside the rotor core 52 is in the center line L1. It will flow similarly on both sides (both sides in the circumferential direction). From these things, the leakage of the magnetic flux in the axial direction can be further suppressed. Moreover, since the rectification | straightening part 54c makes the shape which protruded in the front end side of the pseudo magnetic pole 52b, the idling of the rotor core 52 with respect to the fixing | fixed part 54a is prevented. Furthermore, the distal end portion on the radially outer side of each rectifying portion 54c is inserted into the escape groove 52d, so that the fixing portion 54a can be easily pressed into the press-fitting hole 52c of the rotor core 52. Further, since the flow of magnetic flux can be adjusted by the escape groove 52d, leakage of the magnetic flux in the axial direction can be further suppressed.

  6 is different from the rotor 51 shown in FIG. 5 in the shape of the press-fitting hole 62a of the rotor core 62 and the shape of the covering fixing member 63. In FIG. 6, the same components as those in the example shown in FIG.

  The press-fitting holes 62a of the rotor core 62 have a circular shape when viewed from the axial direction, and four positions that are equiangularly spaced in the circumferential direction, and four positions that are equal in circumferential direction to the four pseudo magnetic poles 52b. A first insertion groove 62b is provided that is recessed outward in the radial direction. The first insertion groove 62b has a quadrangular shape when viewed from the axial direction.

  The covering fixing member 63 made of a non-magnetic material includes a cylindrical fixing portion 63a and a first covering portion 14b (or a first covering portion) (not shown) formed integrally with one end portion in the axial direction of the fixing portion 63a. 32a) and a second covering portion 14c (or second covering portion 32b) (not shown) fixed integrally to the other end portion in the axial direction of the fixing portion 63a. On the outer peripheral surface of the fixed portion 63a, second insertion grooves 63b extending along the axial direction are recessed at four locations that are equiangularly spaced in the circumferential direction. Similarly to the first insertion groove 62b, the second insertion groove 63b has a quadrangular shape when viewed from the axial direction, and the circumferential width thereof is equal to the circumferential width of the first insertion groove 62b. ing.

  The covering fixing member 63 is fixed to the rotating shaft 11 so as to be integrally rotatable by press-fitting the rotating shaft 11 into the fixing hole 54b of the fixing portion 63a. Further, when the rotor core 62 is externally fitted to the fixed portion 63a (that is, when the fixed portion 63a is press-fitted into the press-fitting hole 2a of the rotor core 62), the rotary shaft 11 and the rotor core 62 are connected via the fixed portion 63a. It is fixed so that it can rotate together. The rotor core 62 is formed in the fixing portion 63a so that the circumferential positions of the four first insertion grooves 62b formed in the rotor core 62 and the four second insertion grooves 63b formed in the fixing portion 63a coincide. It is fitted. Accordingly, each first insertion groove 62b is opposed to the second insertion groove 63b in the radial direction, and a groove extending in the radial direction is formed by the first insertion groove 62b and the second insertion groove 63b opposed in the radial direction. Is done. And rod-shaped rectification parts 63c made of a non-magnetic material are inserted into the four grooves made up of the first insertion groove 62b and the second insertion groove 63b, respectively. These rectifying parts 63c constitute a fixing part 63a. Further, each rectifying portion 63c protrudes toward the tip of the pseudo magnetic pole 52b at the circumferential center of each pseudo magnetic pole 52b, and has a symmetrical shape with a center line L1 passing through the center of the pseudo magnetic pole 52b in the circumferential direction as a symmetry axis. I am doing.

  In this way, the rectifying unit 63c has a shape that protrudes toward the tip of the pseudo magnetic pole 52b at the center in the circumferential direction of the pseudo magnetic pole 52b. Accordingly, the magnetic flux of the magnet 13 flows along the rectifying unit 63 c inside the rotor core 62, so that the pseudo magnetic pole from the side surface of the magnet 13 on the rotor core 62 side between the magnet 13 adjacent to the circumferential direction and the pseudo magnetic pole 52 b. It becomes easy to flow toward the tip of 52b. Alternatively, the magnetic flux of the magnet 13 flows along the rectifying unit 63 c inside the rotor core 62, so that the rotor core 62 in the magnet 13 from the tip of the pseudo magnetic pole 52 b between the magnet 13 and the pseudo magnetic pole 52 b adjacent in the circumferential direction. It becomes easy to flow toward the side of the side. Further, since the rectifying unit 63c has a symmetrical shape with the center line L1 passing through the center in the circumferential direction of the pseudo magnetic pole 52b as a symmetric axis, the magnetic flux flowing along the rectifying unit 63c inside the rotor core 62 is in the center line L1. It will flow similarly on both sides (both sides in the circumferential direction). From these things, the leakage of the magnetic flux in the axial direction can be further suppressed. Moreover, since the rectification | straightening part 63c makes the shape which protruded in the front end side of the pseudo magnetic pole 52b, the idling of the rotor core 62 with respect to the fixing | fixed part 63a is prevented. Further, by providing the four first insertion grooves 62b in the press-fit holes 62a of the rotor core 62, the press-fit holes 62a can be formed more easily than when forming a press-fit hole having a circular cross section without the first insert grooves 62b. can do. Similarly, since the four second insertion grooves 63b are provided in the fixing portion 63a, the fixing portion 63a (particularly the outer peripheral surface) is made more than the case where the cylindrical fixing portion 63a not provided with the second insertion groove 63b is formed. It can be formed easily. In addition, in the rotor 61 shown in FIG. 6, it is good also as a structure which does not insert the rectification | straightening part 63c in the 1st insertion groove 62b and the 2nd insertion groove 63b. Even in this case, the magnetic flux is rectified by the presence of the first insertion groove 62b and the second insertion groove 63b. The rotor core 62 and the fixing portion 63a are not integrally fixed by press-fitting the fixing portion 63a into the press-fitting hole 62a of the rotor core 62, but the rectifying portion 63c is provided in the first insertion groove 62b and the second insertion groove 63b. The rotor core 62 and the fixing portion 63a may be fixed integrally by press-fitting. In this way, the inner peripheral surface and the outer peripheral surface of the fixed portion 63a do not have to be processed with high precision in consideration of the distortion of the fixed portion 63a during press-fitting, and the idling between the rotor core 62 and the fixed portion 63a is also prevented. It is further prevented.

In each of the above embodiments, at least one of the first covering portions 14b and 32a and the second covering portions 14c and 32b may bias the magnet 13 in the axial direction.
For example, in the example shown in FIGS. 7A and 7B, the same number (four in this example) of pressing protrusions 71 as the magnets 13 are provided on the axial end surface of the first covering portion 14b on the rotor core 12 side. Is formed. Corresponding to the four magnets 13 held by the rotor core 12, the pressing protrusions 71 are formed at four positions that are equiangularly spaced in the circumferential direction, and are formed at positions facing the magnet 13 in the axial direction. Yes. Further, the pressing protrusion 71 protrudes in the axial direction, and has a hemispherical shape in the example shown in FIGS. 7A and 7B. When the fixing portion 14a is press-fitted into the press-fitting hole 12a of the rotor core 12, each pressing protrusion 71 comes into contact with one end surface of the magnet 13 in the axial direction (the right end surface in FIG. 7A). Further, the fixing portion 14a is press-fitted into the press-fitting hole 12a along the axial direction until the magnet 13 is urged in the axial direction by the pressing protrusion 71. In this way, the magnet 13 is biased in the axial direction by the first covering portion 14b, so that movement in the axial direction is suppressed. Therefore, the axial displacement of the magnet 13 with respect to the rotor core 12 is suppressed. In the example shown in FIGS. 7A and 7B, the pressing protrusion 71 is formed only on the first covering portion 14b, but may be formed also on the second covering portion 14c. Moreover, you may form the press protrusion 71 only in the 2nd coating | coated part 14c.

  Further, in the example shown in FIGS. 8A and 8B, the leading end portion of each extending portion 32c of the first covering portion 32a and the leading end portion of each extending portion 32c of the second covering portion 32b are rotor cores. It is bent toward the 12 side. The fixed portion 14a is configured such that the tip of each extending portion 32c of the first covering portion 32a abuts on one end surface in the axial direction of each magnet 13 (the end surface on the right side in FIG. 8B). The portion 32c is press-fitted along the axial direction into the press-fitting hole 12a of the rotor core 12 until the portion 32c is relatively pressed by the magnet 13 and elastically deformed. Further, the second covering portion 32b has the tip of each extending portion 32c of the second covering portion 32b abuts on the other end surface in the axial direction of each magnet 13 (the left end surface in FIG. 8B), and further, Until each extended portion 32c is relatively pressed by the magnet 13 and elastically deformed, it is externally fitted along the axial direction at the axial end of the fixed portion 14a opposite to the first covering portion 32a. . Accordingly, each extending portion 32c of the first covering portion 32a and each extending portion 32c of the second covering portion 32b respectively bias the magnet 13 in the axial direction. By doing so, the magnet 13 is biased in the axial direction by the first covering portion 32a and the second covering portion 32b, thereby suppressing the movement in the axial direction. Therefore, the axial displacement of the magnet 13 with respect to the rotor core 12 is suppressed.

  In the example shown in FIGS. 8A and 8B, all the leading end portions of the extending portions 32c of the first covering portion 32a and the extending portions 32c of the second covering portion 32b are all rotor cores. Although bent to the 12 side, it may be curved. Further, only the distal end portion of each extending portion 32c of the first covering portion 32a or only the distal end portion of each extending portion 32c of the second covering portion 32b may be bent or curved toward the rotor core 12 side.

  The magnet 13 may be magnetized so that the radially outer side surface 13b side is the S pole and the radially inner side surface 13a side is the N pole. In this case, in the rotors 3 and 31, the S pole magnets 13 and the pseudo magnetic poles 12c are alternately arranged in the circumferential direction, and the pseudo magnetic poles 12c function as pseudo N poles.

  The number of magnets 13 and the number of pseudo magnetic poles 12c provided in the rotors 3 and 31 are not limited to four and may be changed as appropriate. If the pseudo magnetic pole 12c of the rotor core 12 protruding in the radial direction and the magnet 13 of one magnetic pole are alternately arranged in the circumferential direction, and the pseudo magnetic pole 12c functions as the other magnetic pole. The shape of the magnet 13 and the shape of the pseudo magnetic pole 12c may be changed as appropriate.

  The motor of each of the above embodiments is an IPM (embedded magnet) type motor in which the magnet 13 is embedded in the rotor core 12 by inserting the magnet 13 into the holding hole 12b formed in the rotor core 12. . However, the motor may not be an IPM type motor as long as it is a continuous pole type motor. The motors of the above embodiments are inner rotor type motors in which the rotors 3 and 31 are disposed inside the stator 2. However, an outer rotor type motor in which a rotor core holding a magnet on the outer periphery of the stator is disposed, a fixing portion that is interposed between the rotation shaft and the rotor core and fixes the rotation shaft and the rotor core so as to be integrally rotatable, You may provide the coating | coated fixing member which has a coating | coated part which coat | covers at least one part of the end surface of an axial direction. The covering fixing member is formed to be similar to a nonmagnetic material.

The technical ideas that can be grasped from each of the above embodiments and each of the above modifications will be described below.
(B) pre-Symbol the covering fixing members arranged on both sides of the axial direction of the rotor core, it characterized by forming the same shape. According to this configuration, the manufacturing cost can be reduced compared to the case where a plurality of types of covering fixing members are formed.

(B) said fixed part of the front Symbol the cover fixing member disposed on one side in the axial direction of the rotor core, and the fixed portion of the cover fixing member disposed at the other side in the axial direction of the rotor core, axial it characterized in that at a distance from each other in direction. According to this configuration, since a gap is provided between the rotation shaft and the rotor core, an air layer is formed between the rotation shaft and the rotor core. Therefore, since the magnetic resistance between the rotating shaft and the rotor core increases, it becomes difficult for the magnetic flux to flow in the radial direction from the rotating shaft to the rotor core or from the rotor core to the rotating shaft. Therefore, the magnetic flux of the magnet can be further prevented from leaking in the axial direction and flowing into the rotating shaft, and the magnetization of the rotating shaft can be further suppressed. Furthermore, since the fixing portions of the two covering fixing members are formed short so as to be separated from each other in the axial direction, the material for forming the covering fixing member can be reduced. Therefore, the manufacturing cost can be further reduced.

  DESCRIPTION OF SYMBOLS 1 ... Motor case, 3, 31, 51, 61 ... Rotor, 11 ... Rotary shaft, 12, 52, 62 ... Rotor core, 12c, 52b ... Pseudo magnetic pole, 13 ... Magnet, 14, 32, 41, 42, 54, 63 ... coating fixing member, 14a, 41a, 42a, 54a, 63a ... fixing part, 14b, 32a ... first covering part as covering part, 14c, 32b ... second covering part as covering part, 41b ... covering part, 54c , 63c: rectification unit, L1: center line.

Claims (3)

A motor case,
A rotor that is disposed inside the motor case and has a rotor core having a pseudo magnetic pole alternately arranged in the circumferential direction and a magnet of one magnetic pole,
A motor equipped with
A nonmagnetic member, and a fixing portion that is interposed between the rotor core and the rotation shaft so as to integrally rotate the rotor core and the rotation shaft; and at least a part of an axial end surface of the magnet comprising a cover fixing member having a covering portion for covering the,
The covering fixing members each having the fixing portion and the covering portion are provided on both sides in the axial direction of the rotor core, respectively.
The fixing portions of the covering fixing members provided on both sides in the axial direction of the rotor core are spaced apart in the axial direction,
A motor characterized in that a gap is formed between both fixed portions in the axial direction and between the outer peripheral surface of the rotating shaft and the inner peripheral surface of the rotor core . The motor according to claim 1,
The motor according to claim 1, wherein the covering portion biases the magnet in an axial direction. In the motor according to claim 1 or 2,
The fixed portion protrudes toward the tip of the pseudo magnetic pole at a central portion in the circumferential direction of the pseudo magnetic pole, and a rectifying portion having a symmetrical shape with a center line passing through the center of the pseudo magnetic pole in the circumferential direction as a symmetry axis. A motor comprising the motor.

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