JP2010233291A - Rotor for motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive, reliable rotor for motor, which can be used stably even at the time of high output and high revolution. <P>SOLUTION: A rotor 10 for a motor 1 includes a core in which thin stacked core plates 12 are caught with two sheets of end plates 15 and a through-hole is created at the center, and a shaft 13 which is inserted into the through-hole of the core. The rotor is provided with a regulating means which regulates the relative rotation of the two sheets of end plates 15 and the stacked core plates 12. A key part 16, which projects into the through-hole 15c, is formed at the end plate 15. In the shaft 13, a key groove 13a for regulating the relative rotation between the end plate 15 and the shaft 13 while engaging with the key part 16, is cut in parallel with the axial direction of the shaft 13. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotor of a motor.

  In recent years, with the improvement of technology, rotating electrical machines such as motors are required to operate at high speed and high output rotation. In such a situation, for example, in a motor of a type in which a shaft is press-fitted into a rotor core (laminated core) of the rotor, the press-fitting allowance is increased in order to increase the transmission torque.

  On the other hand, in what is shown in Patent Document 1, as shown in FIG. 1 of Patent Document 1, a core sheet 4 having a square through hole 6 formed in the center is stacked while being rotated by a predetermined angle, By connecting the through hole 6, the shaft fitting hole 5 is formed in a polygonal shape when viewed from the press-fitting direction of the shaft 3. In this way, when the shaft 3 is press-fitted into the shaft fitting hole 5, the contact position between the shaft 3 and each through hole 6 is dispersed in the circumferential direction, so that the press-fitting resistance of the shaft 3 is reduced and the surface of the shaft 3 is reduced. Is not easily scratched.

  Moreover, in what is shown to patent document 2, as shown in FIG. 4 of patent document 2, as for the shaft fitting hole 2a of each sheet steel plate 2, the small diameter part r1 and the large diameter part r2 are alternately arrange | positioned in the circumferential direction. When the thin steel plates 2 are laminated, the shaft fitting holes 2a are laminated such that the small diameter portions r1 and the large diameter portions r2 are alternately arranged in the axial direction. As a result, when the shaft 4 is press-fitted into the fitting hole 1a of the rotor core 1, the contact portion of each thin steel plate 2 with the shaft 4 is easily deformed, so that it can be press-fitted with a low load, and the surface of the shaft 4 is hardly scratched.

  Furthermore, in what is shown in Patent Document 3, as shown in FIG. 1 of Patent Document 3, a collar 5 having a linear expansion coefficient larger than that of the core 2 is interposed between the core 2 and the shaft 4, so that the shaft 4 and the collar are arranged. 5 and the collar 5 and the core 2 are press-fitted and fastened. As a result, the collar 5 can always secure the necessary tightening allowance even if the collar 5 expands and contracts between the core 2 and the shaft 4 having a small linear expansion coefficient at high and low temperatures. Communication is done properly. Since a soft material suitable for press-fitting is selected for the collar 5, the shaft 4 can be press-fitted to the collar 5 with a low load, and the surface of the shaft 4 is hardly scratched.

Japanese Patent Laid-Open No. 2004-23848 JP 2006-217770 A JP 2006-187063 A

  However, in the above-described Patent Document 1, torque is transmitted by the frictional resistance between the shaft 3 and the shaft fitting hole 5, so that it is large to efficiently transmit torque to the shaft 3 at high rotation and high output. It is necessary to set a closing allowance. However, if the tightening margin is too large, stress concentrates on the corners of the shaft through-holes of each core sheet 4 formed in a polygonal shape, which may lead to cracking of the core, so at high rotation and high output. There are problems in performance and reliability.

  Moreover, in what is shown in patent document 2, it is comprised so that the contact part of the shaft 4 press-fit and the insertion hole 1a of the rotor core 1 may deform | transform easily. Therefore, it is difficult to efficiently transmit force to the shaft 4 at the time of high rotation and high output, and there are problems in performance and reliability.

  Moreover, in the thing shown in patent document 3, not only the collar 5 press-fitted into the shaft 4 is separately required, but when the core 2 is press-fitted into the collar 5, the surface of the collar 5 is shaved by the core 2, and the metal scrap Will occur. There is a possibility that this metal scrap adheres to the temperature measuring part in the motor case or the connector part of the control sensor and causes a problem.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a highly reliable motor rotor that can be used stably even at high output and high speed while being low in cost.

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a laminated thin plate core plate is sandwiched between two end plates and a through hole is formed in a central portion, and the core penetrates. In a motor rotor provided with a shaft inserted through a hole, a restricting means for restricting relative rotation between the two end plates and the laminated core plate is provided, and the end plate is provided with the through hole. A protruding key portion is formed, and a key groove is formed in the shaft in parallel with the axial direction of the shaft to engage with the key portion and restrict relative rotation between the end plate and the shaft. It is that.

  The invention according to claim 2 is characterized in that, in claim 1, the restricting means includes pins in at least two insertion holes formed through the two end plates and the core plate in the axial direction. Alternatively, each bolt is inserted and both end surfaces of the pin are crimped, or a nut is screwed onto the bolt.

  The invention according to claim 3 is characterized in that, in claim 1 or claim 2, the end plate is formed of a nonmagnetic material having good machinability and a nonmagnetic material having higher strength than the outer periphery. The outer peripheral portion and the inner peripheral portion are integrally connected by press-fitting, the inner peripheral portion is formed with the through hole, and the restricting means is used to form the core. The relative rotation with the plate is restricted.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the end plate has a concavo-convex shape in contact with the end plate of the laminated core plate. That is, the shape of the inner end surface that comes into contact with the core plate is formed.

  According to the first aspect of the present invention, the key portion is formed on the end plate, and the core is fitted on the shaft in a state where the key portion is engaged with the key groove formed on the shaft while restricting relative rotation. Has been. The relative rotation between the end plate and the laminated core plate is restricted by the regulating means, so that the power from the laminated core plate is reliably transmitted to the shaft through the key portion of the end plate. As a result, relative rotation does not occur between the core and the shaft in a high output and high rotation range, and high performance and high reliability are ensured. Further, since the shaft is not press-fitted into the laminated core plate, the shaft surface is not damaged and the generation of metal scraps can be prevented, so that the metal scraps do not adhere to the electronic components in the motor case and cause problems.

  According to the invention of claim 2, the core plate laminated with the two end plates is formed by crimping the both end surfaces of the pin inserted through the insertion hole, or the nut inserted into the bolt inserted through the insertion hole. It is fixed by being screwed. As a result, the two end plates are firmly fixed to the laminated core plates by a simply configured regulating means.

  According to the invention of claim 3, the outer peripheral portion of the end plate is formed of a non-magnetic material having good machinability, the inner peripheral portion is formed of a non-magnetic material having higher strength than the outer peripheral portion, and a through hole is formed in the central portion. Is provided, and relative rotation between the laminated core plates is restricted by the restriction means. The outer peripheral portion and the inner peripheral portion are integrally connected by press-fitting. The outer peripheral portion formed of a non-magnetic material with good machinability is used for balance adjustment. That is, when the motor is assembled, the rotational balance of the rotor is measured, and when the rotational balance is out of specification, a part of the outer peripheral portion is removed by a correction blade such as a drill and the balance is adjusted. As described above, the support of the core plates stacked by the end plates and the adjustment function of the rotation balance can be established, so that it can be handled at a low cost. Moreover, since the outer peripheral part formed of the non-magnetic material with good machinability is easy to cut, the correction efficiency is high and the replacement frequency of the balance correction blade is reduced, thereby reducing the cost.

  According to the invention which concerns on Claim 4, according to the uneven | corrugated shape of the end surface of the laminated | stacked core plate, the shape of the inner end surface of the end plate which touches the end surface of a core plate is formed. As a result, regardless of the shape of both end faces of the laminated core plate, the laminated core plate can be securely attached to the end plate, so the laminated core plate and end plate can be firmly fixed, improving reliability. Is done.

It is the fragmentary top view seen from the rotating shaft direction of the motor 1 concerning this embodiment. 1 is an exploded perspective view of a rotor according to a first embodiment. It is a rotor core top view concerning this embodiment. It is a core top view concerning this embodiment. FIG. 5 is a sectional view taken along line 5-5 in FIG. 4. FIG. 6 is a sectional view taken along line 6-6 in FIG. It is a disassembled perspective view of the rotor concerning 2nd Embodiment. It is a disassembled perspective view of the rotor concerning 3rd Embodiment.

  A first embodiment in which the present invention is embodied in a rotor (hereinafter referred to as a rotor) of a motor 1 that is a rotating electrical machine device will be described with reference to FIGS. As shown in FIG. 1, the motor 1 includes a rotor 10 and a stator 2. The stator 2 has a stator core 23 in which a plurality of teeth 18 are formed at a predetermined pitch in the circumferential direction. The stator core 23 is formed by laminating electromagnetic steel plates in the rotation axis direction. The stator 2 forms a magnetic field inside the stator 2 by passing a current through windings (not shown) wound around the teeth 18.

  The rotor 10 is provided to be rotatable with respect to the stator 2 with an air gap interposed inside the stator 2. The rotor 10 receives a magnetic force from the teeth 18 of the stator core 23 that has become a magnetic pole when current is passed through the windings of the stator 2, and rotates about the axis of a rotating shaft (not shown). Thereby, the motor 1 outputs a predetermined torque from the rotating shaft.

  The rotor 10 includes a rotor core 11 that is a core plate 12 stacked as shown in the exploded perspective view of FIG. 2, a plurality of permanent magnets (not shown) that are embedded in the rotor core 11 so as to face the teeth 18 of the stator core 23, and It comprises two end plates 15 that sandwich the rotor core 11, and a columnar shaft 13 that is inserted through a through hole provided in the center of the core formed by the end plate 15 and the rotor core 11. Relative rotation of the end plate 15 and the rotor core 11 is restricted and fixed by a predetermined restricting means. Here, the predetermined restricting means is that the end plate 15 and the rotor core 11 are penetrated in the axial direction of the shaft 13, and the pins 19 are respectively inserted into the four through holes 15 f and 11 c that are drilled. This means means that the end plate 15 and the rotor core 11 are fixed by crimping both end faces.

  The core plate 12 constituting the rotor core 11 is formed of a magnetic material such as a silicon steel plate. The core plate 12 is punched one by one from the thin plate material by a known means (not shown). A through hole 14 for inserting the shaft 13 is formed in the central portion of the rotor core 11. The through hole 14 is formed by stacking a plurality of core plates 12 and communicating through holes 17 formed at the center of the core plate 12. Further, as described above, the rotor core 11 is provided with four insertion holes 11c that pass through the end surface 11a to the end surface 11b and through which the pins 19 for restricting the relative rotation between the end plates 15 and the rotor core 11 are inserted. Yes. As shown in FIG. 3, the four insertion holes 11 c are arranged at intervals of 90 degrees around the center P at a predetermined distance from the center P of the through hole 14 of the rotor core 11. The number of the insertion holes 11c may be two or more, and the number of the insertion holes 11c is determined according to the magnitude of the force necessary to fix the rotor core 11. And it is preferable to arrange | position the through-hole 11c at equal intervals around the center P according to the number arrange | positioned.

  As shown in FIGS. 5 and 6, each end plate 15 sandwiches the rotor core 11 between both end faces 11 a and 11 b of the rotor core 11. Each end plate 15 is made of a non-magnetic material in order to prevent leakage of magnetic lines of force in the axial direction of the rotor core 11 generated from the stator 2. Each end plate 15 includes an outer peripheral portion 15a and an inner peripheral portion 15b. Each end plate 15 is formed in a substantially disk shape as shown in FIGS. 2 and 4, and a through hole 15 c is formed in the center. The outer peripheral portion 15a of each end plate 15 is formed of, for example, copper (others may be zinc alloy or aluminum alloy) which is a nonmagnetic material having good machinability. Further, the inner peripheral portion 15b of each end plate 15 is formed of, for example, SUS, which is a nonmagnetic material having high strength. The outer peripheral portion 15a is used for adjusting the rotation balance while being removed in the motor assembled state. The inner peripheral portion 15b is for sandwiching and supporting the rotor core 11. As shown in FIGS. 5 and 6, the outer peripheral portion 15a and the inner peripheral portion 15b are divided in a stepped shape at a substantially central portion of the width of the disc-shaped flange portion of each end plate 15, and the step portion 15d is stepped. 15e is press-fitted and fixed so that the outer peripheral portion 15a does not fall off. The inner end face shape of the end face of each end plate 15 in contact with both end faces 11a, 11b of the rotor core 11 is formed in accordance with the concavo-convex shape of both end faces 11a, 11b of the rotor core 11, so that the end faces 11a, 11b of the rotor core 11 can be in close contact. In the present embodiment, the horizontal planes are formed.

  In addition, two key portions 16 for restricting relative rotation between the end plates 15 and the shafts 13 are provided in the through holes 15c at the center of the end plates 15 in a protruding manner. The two key portions 16 are preferably provided so as to face each other by 180 degrees with respect to the center O of each end plate 15.

  As shown in FIG. 4, the key portion 16 extends from the inner circle portion of the inner peripheral portion 15b of each end plate 15 with a predetermined width toward the center O of the through hole 15c. The width between the side surfaces 16a and 16b of the key portion 16 is formed so as to be slightly narrower than the width of the key groove 13a in the first engagement with the key groove 13a of the shaft 13, which will be described later, in the present embodiment. Then, side surfaces 16a and 16b are formed with a slight taper angle so that the key portion 16 is smoothly press-fitted into the key groove 13a. Then, the key portion 16 of the end plate 15 is inserted into the key groove 13a of the shaft 13 while the end surface 13a or 13b of the shaft 13 is inserted into the through hole 15c of the end plate 15, and eventually the side surfaces 16a and 16b are in a press-fitted state. It is moved to the position. As a result, the relative rotation between the end plate 15 and the shaft 13 is restricted and fixed without play. One or more key parts 16 may be provided. When more than two key parts 16 are provided, each key part 16 is preferably arranged at equiangular intervals in the circumferential direction with respect to the center O of each end plate 15.

  A pin 19 is inserted into the inner peripheral portion 15b of each end plate 15 to constitute a restricting means for sandwiching the rotor core 11 between both end faces 11a and 11b and restricting relative rotation between each end plate 15 and the rotor core 11. In this embodiment, four insertion holes 15f are provided. The four insertion holes 15f are arranged at intervals of 90 degrees around the center O of the end plate 15. The arrangement positions of the four insertion holes 15f are provided so as to coincide with the positions of the four insertion holes 11c of the rotor core 11 in a state where the end plate 15 sandwiches the rotor core 11. The four pins 19 allow the rotor core 11 and the end plate 15 to be connected to the inner peripheral portion of the end plate 15 on the other end side from the outer end surface of the inner peripheral portion 15b of the end plate 15 on the one end side through the insertion hole 11c of the rotor core 11. It is inserted to the outer end face of 15b. Then, as shown in FIG. 6, the both ends of the pin 19 are caulked by, for example, rolling caulking or the like, so that relative rotation between each end plate 15 and the rotor core 11 is restricted and fixed.

  The shaft 13 is provided with four key grooves 13a having a predetermined depth which are carved in parallel with the axial direction of the shaft 13 constituting the restricting means. Two key grooves 13 a are formed in the axial direction of the shaft 13 and are opened outward from the one end surface 13 b and the other end surface 13 c of the shaft 13. And when the rotor core 11 is assembled | attached to the shaft 13, it is extended to the position more than the rotor core end surface 11a or 11b nearest at least. The keyway 13a extended at this time may extend from one end surface 13b of the shaft 13 to the other end surface 13c. Further, one or more key grooves 13 a of the shaft 13 may be formed on each of the one end surface 13 b side and the other end surface 13 c side of the shaft 13. And the number and position of the keyway 13a should just be provided corresponding to the key part 16 mentioned above, respectively.

  Next, a procedure for assembling the rotor 10 according to this embodiment will be described. Assembly is performed in the following order (1) to (6).

  (1) First, the step portion 15d provided on the outer peripheral portion 15a constituting each end plate 15 is press-fitted into the step portion 15e of the inner peripheral portion 15b constituting each end plate 15 to form each end plate 15. .

  (2) Next, the end plate 15 on one end side is press-fitted into the shaft 13. As a procedure, first, either one end surface 13b side or 13c side of the shaft 13 is inserted into the through hole 15c of the end plate 15, and at the same time, the side surfaces 16a and 16b of the key portions 16 provided on the end plate 15, The key groove 13a formed in the shaft 13 is fitted. Here, the width between both side surfaces 16a and 16b of each key portion 16 is formed narrower than the width of the key groove 13a on the side portion inserted into the key groove 13a. Therefore, each key portion 16 is initially inserted smoothly into the key groove 13a, and then the end plate 15 is moved to a predetermined position while being in a press-fitted state.

  (3) Next, the shaft 13 is inserted into the rotor core 11. Specifically, in the above (2), the end surface 13c or 13b of the shaft 13 opposite to the side where the end plate 15 on one end side is press-fitted is inserted into the through hole 14 of the rotor core 11. Then, the end surface 11a of the inserted rotor core 11 is brought into contact with the inner end surface of the end plate 15 on the one end side press-fitted into the shaft 13 in the above (2).

  (4) Next, the end plate 15 on the other end side is press-fitted from the end surface 13b or 13c of the shaft 13 on the side where the rotor core 11 is inserted in (3). First, the shaft 13 is inserted into the through hole 15c of the end plate 15 on the other end side in the same manner as described in (2), and then the key portion 16 of the end plate 15 on the other end side and the key groove 13a of the shaft 13 are Is moved until the end plate 15 on the other end side and the end surface 11b of the rotor core 11 are in close contact with each other.

  (5) Next, each end plate 15 and the rotor core 11 are fixed by the regulating means. First, the fixing pin 19 is inserted from the insertion hole 15f formed in the inner peripheral portion 15b of the end plate 15 on one end side, and the insertion hole 15f of the end plate 15 on the other end side is inserted through the insertion hole 11c of the rotor core 11. Until it is inserted. At this time, both ends of the pin 19 that is formed so as to protrude slightly from each end plate 15 and that has a thin inside and is hollow inside are caulked by rolling caulking or the like. The relative rotation of the is regulated and fixed. At this time, each end plate 15 and the shaft 13 are fixed with their relative rotation restricted and fixed via a key portion 16 press-fitted into the key groove 13a, so that the rotor core 11 and each end plate are simple in spite of a simple configuration. 15 and the shaft 13 are fixed integrally.

  (6) Then, components such as a rotation sensor are further assembled, and balance adjustment is performed when the rotor assembly state is reached. The balance adjustment is performed while actually rotating the rotor and measuring the balance with a device such as an autobalancer. Measured by an autobalancer, if the rotational balance deviation exceeds a preset tolerance, a part of the outer peripheral portion 15a of the end plate 15 is removed, the rotational center of gravity is moved, and the rotational balance deviation is an acceptable value. Make adjustments to fit inside. At this time, since the outer peripheral portion 15a is formed of a non-magnetic material having good machinability, the removal processing can be performed easily and quickly, and an excessive load is applied to the processing tool and processing apparatus used for the removal processing. There is no.

  In the first embodiment, the relative rotation between the end plates 15 and the rotor core 11 is restricted and fixed by using the pins 19 and crimping both ends of the pins 19. However, the present invention is not limited thereto, and an unillustrated bolt is inserted from the insertion hole 15f at one end of the end plate 15 to the insertion hole 15f of the end plate 15 at the other end through the insertion hole 11c of the rotor core 11, and protrudes to the other end side. The nut may be fixed by screwing a nut (not shown) to the male thread portion of the bolt. The same effect can be expected by this.

  As apparent from the above description, in the first embodiment, the end plate 15 is formed with the key portion 16, and the key portion 16 restricts relative rotation to the key groove 13 a formed in the shaft 13. The core is inserted into the shaft 13 in an engaged state. Since the end plate 15 is restricted by the restricting means from relative rotation with the rotor core 11 that is the laminated core plate 12, the power from the rotor core 11 is reliably transmitted to the shaft 13 via the key portion 16 of the end plate 15. Is transmitted to. As a result, relative rotation does not occur between the core and the shaft 13 in a high output and high rotation range, and high performance and high reliability are ensured. Further, since the shaft 13 is not press-fitted into the rotor core 11, the surface of the shaft 13 is not damaged and the generation of metal scraps can be prevented, so that the metal scraps do not adhere to the electronic components in the motor case and cause problems.

  Further, in the first embodiment, the two end plates 15 and the rotor core 11 have nuts attached to the bolts 19 inserted into the insertion holes by crimping both end surfaces of the pins 19 inserted into the insertion holes. It is fixed by being screwed. As a result, the two end plates 15 are firmly fixed to the rotor core 11 which is the core plate 12 laminated by a simply configured regulating means.

  In the first embodiment, the outer peripheral portion 15a of the end plate 15 is formed of a non-magnetic material having good machinability, and the inner peripheral portion 15b is formed of a non-magnetic material having higher strength than the outer peripheral portion 15a. A through hole 15c is provided in the portion, and relative rotation with the rotor core 11 that is the laminated core plate 12 is restricted by the restriction means. The outer peripheral portion 15a and the inner peripheral portion 15b are integrally connected by press-fitting. The outer peripheral portion 15a formed of a non-magnetic material having good machinability is used for balance adjustment. That is, when the motor is assembled, the rotational balance of the rotor is measured, and when the rotational balance is out of specification, a part of the outer peripheral portion 15a is removed by a correction blade such as a drill and the balance is adjusted. As described above, the end plate 15 can support the rotor core 11 and adjust the rotation balance, so that the cost can be reduced. In addition, since the outer peripheral portion 15a formed of a non-magnetic material with good machinability is easy to cut, the correction efficiency is high and the replacement frequency of the balance correcting blade is reduced, thereby reducing the cost.

  Furthermore, in the first embodiment, the shape of the inner end face of the end plate 15 that is in contact with the end face of the rotor core 11 is formed in accordance with the uneven shape of the end face of the rotor core 11 that is the laminated core plate 12. As a result, the rotor core 11 can be securely attached to the end plate 15 regardless of the shape of both end faces of the rotor core 11, so that the rotor core 11 and the end plate 15 can be firmly fixed, and the reliability is improved.

  Next, a second embodiment will be described. The second embodiment differs from the first embodiment only in the rotor core 11 that is the core plate 12 laminated. The same configurations as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted, and description of similar functions is also omitted, and only the changed points are described.

  In the first embodiment, the rotor core 11 is formed by laminating a plurality of core plates 12 formed of thin plates. However, in the second embodiment, as shown in FIG. 7, the divided rotor core 21 corresponding to the rotor core 11 is divided into four segments 21b, 21c, 21d, and 21e, and each of the four segments 21b, 21c, 21d and 21e are formed by laminated thin plate core plates 22. Each segment 21b, 21c, 21d, 21e constitutes a cylindrical divided rotor core 21 having a through hole 24 in the center. Since the divided rotor core is known, the description of the manufacturing method is omitted. In each of the segments 21b, 21c, 21d, and 21e, one pin insertion hole 21a for inserting the fixing pin 19 is penetrated from one end surface 21f to the other end surface 21g. As in the first embodiment, the rotor core 21 is sandwiched between the two end plates 15 by the restricting means, the pins 19 are inserted through the insertion holes 21a and 15f, and both ends of the pins 19 are crimped. 15 and the divided rotor core 21 form a core, and the relative rotation is restricted and fixed. Since each end plate 15 and the shaft 13 are fixed and controlled in relative rotation via the key portion 16, the end plate 15, the divided rotor core 21 and the shaft 13 are connected to each other despite a simple configuration. As a result, the same effect as in the first embodiment can be expected. In the second embodiment, the case where the divided rotor core 21 is divided into four parts has been described. However, the present invention is not limited to this. I can expect.

  Next, a third embodiment will be described. In the third embodiment, the rotor core 11 that is the core plate 12 laminated on the first embodiment and the two end plates 15 are different. The same configurations as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted, and description of similar operations is also omitted, and only changes are described.

  In the third embodiment, as shown in FIG. 8, the rotor core is constituted by a so-called spiral rotor core 31 in which continuous ribbon-like plates 32 are stacked while being spirally wound. That is, the thin ribbon-like plate 32 corresponding to the thin core plate 12 laminated in the first embodiment is spirally laminated. Since the spiral rotor core is also known, the description of the manufacturing method is omitted. Due to the structure of the spiral rotor core 31, a step corresponding to the plate thickness of the ribbon-shaped plate 32 occurs on the end surface 31b including the winding start portion of the ribbon-shaped plate 32 and the end surface 31c including the winding end portion. Further, because of the spiral structure, both end faces 31 b and 31 c of the spiral rotor core 31 are inclined surfaces and do not form a horizontal plane perpendicular to the axis of the shaft 13. Therefore, the end surfaces of the end plates 35 that are in close contact with both end surfaces 31b, 31c of the spiral rotor core 31 are uneven shapes at the winding start portion and the winding end portion of the ribbon-shaped plate 32, and the shape according to the step shape and the inclined surface, That is, the step shape and the inclined surface are reversed. Thereby, each end plate 35 and the both end surfaces 31b and 31c of the spiral rotor core 31 can contact | adhere closely.

  The end plate 35 has an insertion hole 35f through which the fixing pin 19 is inserted. The spiral rotor core 31 is provided with four insertion holes 31 a for inserting the fixing pins 19 at the same positions as the insertion holes 11 c of the rotor core 11. Then, the spiral rotor core 31 is sandwiched between the two end plates 35, the pin 19 is inserted through the insertion holes 31a and 35f, and both ends of the pin 19 are crimped by the same restriction means as in the first and second embodiments. Thus, the end plate 35 and the spiral rotor core 31 form a core, and the relative rotation is restricted and fixed. Each end plate 35 and the shaft 13 are fixed with their relative rotation restricted via a key portion 36. Accordingly, the end plates 35, the spiral rotor core 31, and the shaft 13 are fixed integrally with each other in spite of a simple configuration, and the same effect as in the first and second embodiments can be expected.

  In the second and third embodiments as well, the pin 19 is not used for restricting and fixing the relative rotation between the end plates 15 and 35 and the rotor cores 21 and 31 as in the first embodiment. Relative rotation between the end plates 15 and 35 and the rotor cores 21 and 31 may be restricted and fixed by screwing nuts and screws, not shown. The same effect can be expected by this.

  In the first to third embodiments, power is transmitted from the end plates 15 and 35 to the shaft 13 through the key portions 16 formed integrally with the end plates 15 and 35. However, the present invention is not limited to this. For example, splines (not shown) may be formed on the end plates 15 and 35 and the shaft 13, and power transmission may be performed by engaging the end plates 15 and 35 and the splines of the shaft 13. Good. Furthermore, power transmission may be performed from each end plate 15, 35 to the shaft 13 by providing a knurl on the surface of the shaft 13 and press-fitting each end plate 15, 35 into the knurl.

DESCRIPTION OF SYMBOLS 1 ... Motor, 2 ... Stator, 10 ... Rotor, 11 ... Rotor core, 11c, 31a ... Insertion hole, 12 ... Core plate, 13 ... Shaft, 13a ... Key groove, 14 ... through hole, 15 ... end plate, 15a ... outer peripheral part, 15b ... inner peripheral part, 15c ... through hole, 15f, 35f ... insertion hole, 16. ..Key, 17 ... through hole, 19 ... pin, 20 ... rotor, 21 ... divided rotor core, 22 ... core segment plate, 30 ... rotor, 31 ... spiral rotor core 32 ... Ribbon plate, 35 ... End plate.

Claims (4)

A core having a laminated thin plate core plate sandwiched between two end plates and having a through-hole formed in the center;
In a rotor of a motor provided with a shaft inserted through the through hole of the core,
Providing a regulating means for regulating relative rotation between the two end plates and the laminated core plates;
The end plate is formed with a key portion that projects into the through hole, and the shaft has a key groove that engages with the key portion and restricts relative rotation between the end plate and the shaft. A motor rotor characterized by being engraved in parallel with the axial direction of the motor.   In Claim 1, the restricting means includes a pin or a bolt inserted into at least two insertion holes formed through the two end plates and the stacked core plates in the axial direction. A motor rotor, wherein both ends of the pin are crimped, or a nut is screwed onto the bolt.   3. The end plate according to claim 1, wherein the end plate includes an outer peripheral portion formed of a non-magnetic material having good machinability and an inner peripheral portion formed of a non-magnetic material having higher strength than the outer peripheral portion. The outer peripheral portion and the inner peripheral portion are integrally connected by press-fitting, the inner peripheral portion is formed with the through hole, and the relative rotation with the stacked core plates is restricted by the restricting means. The rotor of the motor characterized by the above-mentioned. The shape of the inner end surface of the end plate that contacts the core plate according to any one of claims 1 to 3 is matched to the uneven shape of the end surface of the stacked core plate that contacts the end plate. A rotor of a motor characterized by being formed.

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