JP2011015475A - Magnetization device for rotary electric machine, and method of magnetizing permanent magnet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of magnetization which improves the magnetization rate of a permanent magnet by keeping the approximately constant opposition interval between a magnetizing yoke and permanent magnets inserted into each magnet insertion hole.SOLUTION: Magnetization is performed with a magnetizing yoke 11, after shifting and pressing a permanent magnet 10 against the outer inwall (the first inwall face 13a) of a permanent magnet insertion hole 13 by rotating a rotor 9, when magnetizing the unmagnetized permanent magnet 10 embedded in the magnet insertion hole 13 of the rotor 9 by a magnetic flux generated by winding 16 provided in the magnetizing yoke 11 thereby making a magnetized permanent magnet. By doing it this way, the opposition interval between each permanent magnet 10 inserted into each magnet insertion hole 13 and the magnetizing yoke 11 becomes constant, thereby enhancing the efficiency of magnetization of the permanent magnet 10.

Description

  The present invention relates to a magnetizing device for a rotating electrical machine and a magnetizing method for a permanent magnet.

  For example, in Patent Document 1, when a magnetized yoke is used to magnetize an unmagnetized permanent magnet inserted and arranged in a rotor, the rotor position is deviated from the normal magnetized position with respect to the magnetized yoke. However, there is disclosed a technique for magnetizing the permanent magnet by returning the rotor position to a normal magnetized position by magnet torque.

JP-A-11-75350

  However, in the technique described in Patent Document 1, a gap for inserting the permanent magnet is required between the magnet insertion hole formed in the rotor and the permanent magnet inserted into the magnet insertion hole. Therefore, the insertion position of the permanent magnet may be different for each magnet insertion hole.

  When the permanent magnet is arranged at the outer peripheral side of the rotor in the magnet insertion hole and when the permanent magnet is arranged at the center side of the rotor, the facing distance between the magnetized yoke and the permanent magnet is set. When a difference arises and these arrangement positions are mixed, the magnetization rate with respect to the permanent magnet is lowered.

  Accordingly, the present invention provides a magnetizing device for a rotating electrical machine and a permanent magnet capable of improving the magnetization rate of the permanent magnet by making the facing distance between the magnetizing yoke and the permanent magnet inserted into each magnet insertion hole substantially constant. A magnet magnetizing method is provided.

  A magnetizing device for a rotating electric machine according to the present invention includes a measuring means for measuring the frequency of a permanent magnet inserted into a magnet insertion hole formed in a rotating rotor, and the frequency of the permanent magnet measured by the measuring means. Determining means for determining that the magnet is in a steady state, and a magnetization start command means for starting magnetization when the determining means determines that the vibration frequency of the permanent magnet has reached a steady state.

  The method of magnetizing a permanent magnet according to the present invention measures the frequency of a permanent magnet inserted into a magnet insertion hole formed in a rotor, and magnetizes when the frequency of the permanent magnet reaches a steady state. An unmagnetized permanent magnet is magnetized by the yoke.

  According to the magnetizing device for a rotating electrical machine of the present invention, when the frequency of the permanent magnet inserted into the magnet insertion hole reaches a steady state, the permanent magnet in each magnet insertion hole is caused by the centrifugal force of the rotating rotor. Moves toward the outer periphery of the rotor, and the permanent magnet is pressed against the outer inner wall of each magnet insertion hole. If magnetization is started when it is determined that all permanent magnets have been pressed against the outer inner wall of the magnet insertion hole, that is, the permanent magnet's frequency has reached a steady state, the facing between the magnetizing yoke and each permanent magnet Since the distance is substantially constant, the magnetization rate can be improved.

FIG. 1 is an overall view of a magnetizing apparatus according to this embodiment. FIG. 2 is a longitudinal sectional view of the magnetizing mechanism portion of FIG. FIG. 3 is a cross-sectional view of the magnetizing mechanism portion of FIG. 4 is an enlarged cross-sectional view of a main part of a magnet insertion hole portion formed in the rotor shown in FIG. 5A is an exploded view of the rotor shown in FIG. 2, and FIG. 5B is a plan view of a plate attached to the rotor core. FIG. 6 is a characteristic diagram showing the relationship between the rotational speed of the rotor and the vibration frequency of the permanent magnet. FIG. 7A is a diagram showing that the permanent magnet moves in the magnet insertion hole when the rotor is rotated at a low speed, and FIG. 7B is a diagram showing the amplitude width of the frequency of the permanent magnet. FIG. 8A is a diagram showing that the permanent magnet is pressed against the outer inner wall surface in the magnet insertion hole when the rotor is rotated at a certain rotational speed or more, and FIG. It is a figure which shows the amplitude width of the frequency of a magnet. FIG. 9 is a diagram showing that when the magnetized yoke is fixed and only the rotor is rotated, the gap between the magnetized yoke and the rotor is narrowed by rotating the rotor eccentrically. FIG. 10 is a diagram showing the movement state of the permanent magnet in the magnet insertion hole and the flow of excess adhesive. FIG. 11 is a diagram schematically showing how an unmagnetized permanent magnet is magnetized by a magnetic flux generated from a winding provided on a magnetized yoke. FIG. 12A is a characteristic diagram showing the relationship between the facing distance between the winding and the permanent magnet and the magnetization rate, and FIG. 12B is a characteristic diagram showing the relationship between the centrifugal force acting on the permanent magnet and the magnetization rate. 12 (C) is a characteristic diagram showing the relationship between the centrifugal force acting on the permanent magnet and the facing distance between the winding and the permanent magnet. FIG. 13A is a diagram illustrating an ideal state in which the center of gravity of the rotor does not vary, and FIG. 13B is a diagram illustrating a state in which the center of gravity of the rotor varies and bends. FIG. 14A is a plan view showing an example of correcting the rotor balance by making a hole that does not penetrate the plate, and FIG. 14B is a cross-sectional view thereof.

  Hereinafter, specific embodiments to which the present invention is applied will be described in detail with reference to the drawings.

“Description of the structure of the magnetizing device for rotating electrical machines”
As shown in FIG. 1, a magnetizing device for a rotating electric machine according to the present embodiment includes a magnetizing mechanism section 1 including a rotor and a magnetizing yoke, and a motor 2 that is a drive source for rotating the rotor and the magnetizing yoke. , Measuring means 4 for measuring the frequency of the rotating shaft 3 fixed to the rotor, determining means 5 for determining that the frequency of the rotating shaft 3 is in a steady state, and detecting the number of rotations of the rotating shaft 3 Rotating speed detecting means 6, magnetizing start command means 7 for starting magnetization when it is determined that the vibration frequency of the rotating shaft 3 has reached a steady state, and heating means disposed at the outer peripheral portion of the magnetizing mechanism section 1. 8 and.

  As shown in FIGS. 2 and 3, the magnetization mechanism unit 1 magnetizes a rotor 9 that is a rotor constituting a rotating electrical machine and an unmagnetized permanent magnet 10 embedded in the rotor 9. The magnetized yoke 11 is a magnetized permanent magnet, and the rotor 9 and the magnetized yoke 11 are coupled together to rotate the rotating shaft 3 for synchronous rotation.

  The rotor 9 includes a rotor core 12, magnet insertion holes 13 formed in the rotor core 12, and plates 13 arranged and fixed at both axial ends of the rotor core 12.

  The rotor core 12 is formed by stacking a plurality of thin electromagnetic steel plates having a disk shape into a cylindrical shape. A plurality of magnet insertion holes 13 are formed in the outer peripheral region of the rotor core 12 at predetermined intervals in the circumferential direction. The magnet insertion hole 13 is a through hole penetrating in the axial direction of the rotor core 12. As shown in FIG. 4, the magnet insertion hole 13 includes a first inner wall surface 13 a that receives the permanent magnet 10 that moves outward by centrifugal force F acting on the permanent magnet 10 when the rotor 9 rotates. A second inner wall surface 13b that is parallel to the first inner wall 13a, and a third inner wall surface 13c and a fourth inner wall surface 13d that are orthogonal to the direction of the centrifugal force F acting on the permanent magnet 10 are configured.

  The opposing distance between the first inner wall surface 13a and the second inner wall surface 13b is a distance that has an allowance for insertion greater than the thickness of the permanent magnet 10 so that the permanent magnet 10 can be easily inserted into the magnet insertion hole 13. Has been. Further, the length of the second inner wall surface 13 b is longer than the length of the first inner wall surface 13 a that is slightly longer than the width dimension of the permanent magnet 10.

  The third inner wall surface 13c is a rear inner wall surface opposite to the head side in the rotation direction X of the rotor 9, and is an inclined surface inclined from the second inner wall surface 13b toward the first inner wall surface 13a. Yes. The fourth inner wall surface 13d is a leading inner wall surface in the rotation direction X (clockwise direction in FIG. 3) of the rotor 9, and is an inclined surface that is inclined from the first inner wall surface 13a toward the second inner wall surface 13b. Has been. In particular, the fourth inner wall surface 13d is an R-shaped portion formed in an R shape. The fourth inner wall surface 13d also functions as an abutting surface against which the permanent magnet 10 is abutted, and abuts at a site that is about ½ or more of the thickness dimension of the permanent magnet 10.

  In addition, the magnet insertion hole 13 has an adhesive escape portion that is a space portion on the side where the fourth inner wall surface 13d and the second inner wall surface 13b are connected to release excess of the adhesive 14 applied to the permanent magnet 10. 15 is formed. When the permanent magnet 10 moves from the second inner wall surface 13b side to the first inner wall surface 13a side by the centrifugal force F acting on the permanent magnet 10 generated by the rotation of the rotor 9, the adhesive escape portion 15 The adhesive 14 applied to the permanent magnet 10 is pushed out and flows along the fourth inner wall surface 13d having an R shape.

  As shown in FIG. 5, the plates 13 are arranged at both axial ends of the rotor core 12 through the rotary shaft 3 press-fitted into the center of the rotor core 12 to fix the laminated steel plates. The plate 13 is formed in a disk shape having a shaft insertion hole 16 through which the rotary shaft 3 is inserted at the center thereof.

  As shown in FIGS. 2 and 3, the magnetized yoke 11 includes a cylindrical portion 11A that surrounds the outer periphery of the rotor 9, and a lid portion 11B that closes the opening of the cylindrical portion 11A. The cylindrical portion 11A is provided with a winding 16 for magnetizing the non-magnetized permanent magnet 10 through magnetic flux. A plurality of the windings 16 are provided at predetermined intervals in the circumferential direction of the cylindrical portion 11A. The winding 16 is connected to a magnetized power source (not shown), and magnetizes the permanent magnet 10 to have a predetermined magnetic pole when energized with a magnetizing current. The lid portion 11B closes the opening of the cylindrical portion 11A in which the rotor 9 is built. The magnetized yoke 11 is fixed to the rotary shaft 3 and rotates integrally with the rotor 9 in synchronism.

  The motor 2 is connected to the rotating shaft 3 by connecting a motor drive shaft 18 via a connecting member 17. The rotational force of the motor 2 is transmitted from the motor drive shaft 18 to the rotary shaft 3 through the connecting member 17.

  The measuring means 4 comprises an acceleration pickup that is attached to a support member 19 that rotatably supports both ends of the rotating shaft 3 and measures the frequency of the rotating shaft 3. This acceleration pickup is provided at each end of the rotating shaft 3 and measures the frequency at both ends of the rotating shaft 3. Since there is a gap between the permanent magnet 10 and the magnet insertion hole 13 as shown in FIG. 4, the rotation of the rotor 9 varies depending on the position of the permanent magnet 10 in each magnet insertion hole 13. As a result, vibration occurs in the rotating shaft 3. The acceleration pickup measures the vibration generated on the rotating shaft 3. Here, the frequency of the rotary shaft 3 is expressed, but the frequency of the rotary shaft 3 is also the frequency of the permanent magnet 10 in the magnet insertion hole 13 described later. Hereinafter, it is assumed that the frequency of the rotating shaft 3 and the frequency of the permanent magnet 10 are synonymous.

  The determination unit 5 determines a time point at which the frequency of the rotary shaft 3 is in a steady state from two vibration signals measured by an acceleration pickup attached to both ends of the rotary shaft 3. In this determination means 5, it is determined that the frequency of the permanent magnet 10 has reached a steady state when the frequency of the rotation shaft 3 reaches a certain value range. As shown in FIG. 6, the frequency of the permanent magnet 10 is high when the rotor 9 is rotating at a low speed, but is stable when a certain number of rotations is exceeded.

  When the rotor 9 rotates at a low speed, the permanent magnet 10 moves in the magnet insertion hole 13 as shown by the arrow in FIG. As shown in (B), the amplitude width H1 is increased. On the other hand, when the rotor 9 rotates at a certain rotational speed or more, the permanent magnet 10 is pressed against the first inner wall surface 13a which is the outer inner wall of the magnet insertion hole 13 by centrifugal force as shown in FIG. In order to maintain this state, the vibration frequency of the permanent magnet 10 does not vary greatly, and the amplitude width H2 becomes small as shown in FIG. 8B.

The number of rotations by which the rotor 9 is rotated so that the frequency of the permanent magnet 10 has a certain numerical value width is expressed by Equation 1. If the rotor 9 is rotated at a rotational speed equal to or higher than this rotational speed, it is possible to maintain the state in which the permanent magnet 10 is pressed against the first inner wall surface 13a which is the outer inner wall of the magnet insertion hole 13.

  The symbols used in Formula 1 are as follows. M is the mass of the magnet, g is the gravitational acceleration, r is the distance from the center of the rotor 9 to the center position of the permanent magnet 10, and μY is the moving distance of the permanent magnet 10 and the resistance due to the viscosity of the adhesive 14. .

  In this embodiment, when the vibration frequency of the rotating shaft 3 measured by the acceleration pickup reaches a certain value range (the permanent magnet 10 in FIG. 8 is pressed against the first inner wall surface 13 a which is the outer inner surface of the magnet insertion hole 13. Determined) is determined that the frequency of the permanent magnet 10 has reached a steady state.

  As shown in FIG. 1, the rotational speed detection means 5 irradiates the reflective tape 20 affixed to the motor drive shaft 18 with visible light, and detects the rotational speed of the motor 2 from the reflected light reflected by the reflective tape 20. . The rotational speed of the motor 2 is the same as the rotational speed of the rotary shaft 3 fixed to the rotor 9.

  When it is determined that the vibration frequency of the rotating shaft 3 has reached a steady state, the magnetization start command means 7 starts the magnetization by passing a magnetizing current through the winding 16 provided in the magnetizing yoke 11.

  The heating means 8 is disposed at the outer peripheral portion of the magnetizing mechanism portion 1. Specifically, the heating means 8 is composed of a heater composed of a heat transfer wire or the like disposed immediately below the magnetized yoke 11. In the heating means 8, the permanent magnet 10 is fixed in the magnet insertion hole 13 by heating and thermosetting the adhesive 14 applied to the unmagnetized permanent magnet 10.

"Description of permanent magnet magnetization method"
Next, a method for magnetizing the unmagnetized permanent magnet 10 will be described. First, a permanent magnet insertion process is performed. First, the adhesive 14 is applied to the surface of the unmagnetized permanent magnet 10. And the permanent magnet 10 which apply | coated the adhesive agent 14 to each magnet insertion hole 13 formed in the rotor core 12 is inserted.

  Next, a plate fixing process is performed. That is, the plates 13 are attached to both ends of the rotor core 12 in the axial direction, and a laminate made of a plurality of electromagnetic steel plates is fixed. In this step, the rotor 9 is obtained.

  Next, the magnetizing yoke 11 is disposed so as to surround the outer periphery of the rotor 9. Specifically, the rotor 9 is accommodated in the cylindrical portion 11A, and the opening of the cylindrical portion 11A is closed by the lid 11B. The magnetized yoke 11 composed of the cylindrical portion 11A and the lid 11B is used as the rotating shaft 3. Thus, both the rotor 9 and the magnetized yoke 11 can be rotated in synchronization with the rotating shaft 3.

  Next, the motor 2 is driven to rotate both the rotor 9 and the magnetized yoke 11 in synchronization. When the rotor 9 and the magnetized yoke 11 are rotated together by the rotating shaft 3, the gap G between the rotor 9 and the magnetized yoke 11 can be reduced. When the magnetized yoke 11 is fixed without rotating and only the rotor 9 is rotated, the gap G is narrowed by rotating the rotor 9 eccentrically as shown by the dotted line in FIG. . In this embodiment, since the rotor 9 and the magnetized yoke 11 are both synchronized and rotated around the rotation shaft 3, the gap G between the rotor 9 and the magnetized yoke 11 is always kept constant. . The rotational speed at which the rotor 9 and the magnetizing yoke 11 are rotated is set to be equal to or higher than the speed obtained by the equation (1).

  Next, a frequency measurement process is performed. By detecting the rotation speed of the motor drive shaft 18 by the rotation speed detection means 6, the rotation speed of the rotary shaft 3 can be determined. Further, the frequency of the rotating shaft 3 (the frequency of the permanent magnet 10) is measured by the measuring means 4 comprising an acceleration pickup. And when the frequency of the permanent magnet 10 is in a steady state, that is, a state where all the permanent magnets 10 inserted into the respective magnet insertion holes 13 are pressed against the first inner wall surface 13a of the outer inner wall (the state shown in FIG. 8). ).

  As shown in FIG. 10, the permanent magnet 10 in the magnet insertion hole 13 receives a centrifugal force F from the position on the second inner wall surface 13b side and the first inner wall surface 13a outside the rotor as shown in FIG. Move towards. At this time, the adhesive 14 is pushed by the permanent magnet 10 and flows so as to collide with the first inner wall surface 13a, but the fourth inner wall surface 13d on the leading side in the rotation direction of the rotor 9 has an R shape. The adhesive 14 flows around the R-shaped portion. Therefore, the viscous resistance of the adhesive 14 is reduced, and the permanent magnet 10 can be moved to the first inner wall surface 13a in a short time.

  Furthermore, since the third inner wall surface 13c on the opposite side of the rotor 9 in the rotational direction is also inclined, similarly, the adhesive 14 rotates from the end of the permanent magnet 10 along this inclined surface. Therefore, it becomes easy to flow to the opposite side to the moving direction of the permanent magnet 10. The adhesive 14 that has flowed along the R-shaped portion flows into and accumulates in the adhesive escape portion 15 formed at the intersection of the fourth inner wall surface 13d and the second inner wall surface 13b having the R shape. Further, the surplus adhesive 14 flows between fine concave portions generated between the respective electromagnetic steel sheets constituting the rotor core 12.

  The permanent magnet 10 that has received the centrifugal force F of the rotor 9 has a fourth inner shape that forms an R shape with the first inner wall surface 13a by the resultant force F2 of the centrifugal force F and the external force F1 in the rotational direction acting on the permanent magnet 10. Pressed against the wall surface 13d. At this time, since the surplus adhesive 14 flows into the recesses between the adhesive escape portion 15 and each of the electromagnetic steel plates, the permanent magnet 10 strikes the first inner wall surface 13a and the fourth inner wall surface 13d in a planar state. become. As a result, the permanent magnet 10 is positioned with respect to the magnet insertion hole 13 on the two surfaces sandwiching the corner on the leading side in the rotational direction of the rotor 9.

  Next, the heating means 8 is operated to heat cure the adhesive 14 applied to the permanent magnet 10. When heat is applied by the heating means 8, the rotor 9 and the magnetized yoke 11 are rotated. When the adhesive 14 is heated and thermally cured, the state in which the permanent magnet 10 is positioned in close contact with the first inner wall surface 13a and the fourth inner wall surface 13d of the magnet insertion hole 13 is maintained.

  When the determination means 5 determines that the frequency of the permanent magnet 10 has reached a steady state (all the permanent magnets 10 are pressed against the first inner wall surface 13a, which is the outer inner wall of the magnet insertion hole 13), the next landing is performed. A magnetic process is performed. As shown in FIG. 11, the magnetization start command means 7 energizes a winding 16 provided in the magnetizing yoke 11 and magnetizes the unmagnetized permanent magnet 10 through the magnetic flux. In FIG. 11, it is described as being generated in an arc shape around the winding 16.

  The magnetization rate for magnetizing the permanent magnet 10 depends on the facing distance between the winding 16 and the permanent magnet 10 and the centrifugal force F acting on the permanent magnet 10. As shown in FIG. 12 (A), the longer the facing distance between the winding 16 and the permanent magnet 10, the harder it becomes to magnetize the permanent magnet 10 and the lower the magnetization rate. As the centrifugal force F acting on the permanent magnet 10 increases as shown in FIG. 12B, the permanent magnet 10 moves to the outer inner wall of the magnet insertion hole 13, so that the magnetization rate is improved. The relationship between the centrifugal force F acting on the permanent magnet 10 and the facing distance between the winding 16 and the permanent magnet 10 is that the winding 16 and the permanent magnet 10 become more permanent as the centrifugal force F increases as shown in FIG. The facing distance to the magnet 10 is reduced and approaches. Further, since the permanent magnet 10 is magnetized in a state where the magnet temperature is increased by the heating means 8, further improvement in the magnetization rate can be expected.

  When all the unmagnetized permanent magnets 10 are magnetized, the magnetization process is terminated and a balance correction process is performed. In the balance correction process, the center of gravity after assembly varies due to variations in the weight of each component such as the rotor core 12, the rotating shaft 3 and the plate 13 in which a plurality of electromagnetic steel sheets are laminated. It is a process to do. FIG. 13A shows an ideal state where the center of gravity G of the rotor 9 does not vary, and FIG. 13B shows a state where the center of gravity G of the rotor 9 varies and is bent.

  In order to suppress the axial shake of the rotor 9, as shown in FIG. 14, the plate 13 provided at both axial ends of the rotor core 12 is machined by an end mill or the like to open a hole 21 that does not penetrate the plate surface. Adjust the weight and balance. The balance-corrected rotor 9 can be rotated without causing shaft shake when rotated about the rotation shaft 3. Through the above steps, the rotor 9 is completed. The completed rotor 9 becomes a rotating electrical machine by being assembled to the stator.

"Effect of the embodiment"
As described above, according to the magnetizing device for a rotating electrical machine of the present embodiment, when the frequency of the permanent magnet 10 inserted into the magnet insertion hole 13 is in a steady state, the centrifugal force of the rotating rotor 9 acts. The permanent magnet 10 in each magnet insertion hole 13 moves to the outer peripheral side of the rotor 9, and the permanent magnet 10 is pressed against the first inner wall surface 13 a that is the outer inner wall of each magnet insertion hole 13. If magnetization is started when it is determined that all the permanent magnets 10 are pressed against the outer inner wall of the magnet insertion hole 13, that is, the frequency of the permanent magnet 10 is in a steady state, the magnetized yoke 11 and each permanent magnet Since the facing distance between 10 is substantially constant, the magnetization rate can be improved.

  Further, according to the rotary electric magnetizing apparatus of the present embodiment, the frequency of the permanent magnet 10 that vibrates in the magnet insertion hole 13 and the frequency of the rotary shaft 3 fixed to the rotor 9 are the same. Therefore, the measurement means 4 can determine the frequency of the permanent magnet 10 inside the rotor core 12 as the frequency of the rotary shaft 3.

  Further, according to the magnetizing device of the rotating electrical machine of the present embodiment, the vibration frequency of the rotating shaft 3 has a constant numerical value range because all the permanent magnets 10 move to the outer inner wall of the magnet insertion hole 13 and rattle occurs. Since there is no state, it can be determined by the determination means 5 that the frequency of the permanent magnet 10 has reached a steady state when the frequency of the rotation shaft 3 reaches a certain value range.

  Further, according to the magnetizing device of the rotating electrical machine of the present embodiment, the magnet insertion hole in the direction orthogonal to the direction of the centrifugal force acting on the permanent magnet 10 inserted into the magnet insertion hole 13 formed in the rotor 9. Since the inner wall 13 (the third inner wall surface 13c and the fourth inner wall surface 13d) is inclined, when the permanent magnet 10 moves toward the first inner wall surface 13a of the outer inner wall due to the action of the centrifugal force, it is permanent. The adhesive 14 applied to the surface of the magnet 10 flows so as to wrap around the inclined surface, whereby the viscous resistance of the adhesive 14 when the permanent magnet is moved can be lowered.

  Further, according to the magnetizing device of the rotating electrical machine of the present embodiment, the R-shaped portion is formed on a part of the inclined inner wall (fourth inner wall surface 13 d) of the magnet insertion hole 13 and applied to the permanent magnet 10. Since the adhesive escape portion 15 for releasing the surplus portion of the agent 14 is formed, the surplus adhesive 14 pressed by the permanent magnet 10 that moves under the action of the centrifugal force F generated by the rotation of the rotor 9 is formed. Then, it flows along the R-shaped portion and is sent to the adhesive escape portion 15. As a result, by rotating the rotor 9, the permanent magnet 10 can be pressed and positioned against the first inner wall surface 13a of the magnet insertion hole 13 in a short time.

  Further, according to the magnetizing device of the rotating electrical machine of the present embodiment, since the rotor 9 and the magnetizing yoke 11 rotate in synchronization with each other, the gap between the rotor 9 and the magnetizing yoke 11 is kept constant. Thus, when the non-magnetized permanent magnet 10 is magnetized by the magnetized yoke 11, the permanent magnet 10 can be uniformly magnetized.

  Further, according to the magnetizing device of the rotating electrical machine of the present embodiment, since the heating means 8 is disposed on the outer peripheral portion of the magnetizing yoke 11, the rotor 9 is rotated to place the permanent magnet 10 on the outer inner wall of the magnet insertion hole 13. The adhesive 14 applied to the permanent magnet 10 in a state of being pressed onto the permanent magnet 10 can be thermally cured. Thereby, rattling can be suppressed in the magnet insertion hole 13 of the permanent magnet 10.

  According to the magnetizing method of the permanent magnet of the present embodiment, if the permanent magnet 10 that has not been magnetized is magnetized by the magnetizing yoke 11 when the frequency of the permanent magnet 10 is in a steady state, The permanent magnet 10 is pressed against the outer inner wall (first inner wall surface 13a) of each magnet insertion hole 13, and the facing distance between the permanent magnet 10 and the magnetizing yoke 11 becomes substantially constant, so that the magnetization rate is improved. Can do.

  Further, according to the magnetizing method of the permanent magnet of the present embodiment, the adhesive 14 is thermoset after the vibration frequency of the permanent magnet 10 becomes a steady state in the magnetizing process, so that the permanent magnet 10 is inserted into the magnet. Since it is cured by being pressed against the outer inner wall (first inner wall surface 13a) of the hole 13, the permanent magnet 10 can be positioned and fixed by the adhesive 14 without rattling.

  In addition, according to the magnetizing method of the permanent magnet of the present embodiment, the rotation is performed by performing the balance correcting step of correcting the rotational axis fluctuation of the rotor 9 by opening the hole 21 that does not penetrate the plate 13 after the magnetizing step. Shake of the child 9 can be suppressed.

  The present invention improves the magnetization rate of the permanent magnet by making the facing distance between the magnetized yoke and the permanent magnet inserted into each magnet insertion hole substantially constant.

DESCRIPTION OF SYMBOLS 1 ... Magnetization mechanism part 2 ... Motor 3 ... Rotating shaft 4 ... Measuring means 5 ... Determination means 6 ... Rotation speed detection means 7 ... Magnetization start command means 9 ... Rotor 10 ... Permanent magnet 11 ... Magnetization yoke 12 ... Rotor core DESCRIPTION OF SYMBOLS 13 ... Magnet insertion hole 14 ... Adhesive 15 ... Adhesive escape part 18 ... Motor drive shaft 21 ... Hole (hole which does not penetrate in plate)

Claims (10)

In a rotary electric magnetizing apparatus that magnetizes an unmagnetized permanent magnet embedded in a rotor to make a magnetized permanent magnet,
A rotor in which a plurality of magnet insertion holes for inserting and arranging unmagnetized permanent magnets in the circumferential direction are formed in the outer peripheral region;
A magnetized yoke arranged so as to surround the outer periphery of the rotor and magnetizing the unmagnetized permanent magnet through magnetic flux;
Measuring means for measuring the frequency of the permanent magnet inserted into the magnet insertion hole of the rotating rotor;
Determining means for determining that the frequency of the permanent magnet measured by the measuring means has reached a steady state;
A magnetizing device for a rotating electrical machine, comprising: a magnetization start commanding unit that starts magnetization when the determining unit determines that the vibration frequency of the permanent magnet has reached a steady state. A magnetizing device for a rotating electric machine according to claim 1,
The magnetizing device for a rotating electrical machine, wherein the measuring means detects a vibration frequency of a rotating shaft fixed to the rotor and sets the vibration frequency of the permanent magnet in the magnet insertion hole. A magnetizing device for a rotating electric machine according to claim 2,
The said determination means determines that the frequency of the said permanent magnet became a steady state when the frequency of the said rotating shaft became a fixed numerical value range. The magnetizing apparatus of the rotary electric machine characterized by the above-mentioned. A magnetizing device for a rotating electrical machine according to any one of claims 1 to 3,
A magnetizing device for a rotating electric machine, characterized in that an inner wall of the magnet insertion hole is inclined in a direction perpendicular to a direction of a centrifugal force acting on the permanent magnet inserted into the magnet insertion hole formed in the rotor. . A magnetizing device for a rotating electrical machine according to claim 4,
An R-shaped portion is formed on a part of the inclined inner wall of the magnet insertion hole, and an adhesive escape portion is formed to release excess of the adhesive applied to the permanent magnet. Magnetic device. A magnetizing device for a rotating electrical machine according to any one of claims 1 to 5,
The rotor and the magnetizing yoke both rotate synchronously. A magnetizing device for a rotating electrical machine. A magnetizing device for a rotating electrical machine according to any one of claims 1 to 6,
A magnetizing device for a rotating electric machine, wherein a heating means is disposed on an outer peripheral portion of the magnetizing yoke. Inserting a non-magnetized permanent magnet coated with an adhesive into a magnet insertion hole formed at a predetermined interval in the circumferential direction in the outer peripheral region of the rotor;
Fixing the plates to both axial ends of the rotor,
A magnetizing yoke is disposed so as to surround the outer periphery of the rotor to which the plate is fixed, and the frequency of the permanent magnet inserted into a magnet insertion hole formed in the rotor by rotating at least the rotor. Measuring the
And a magnetizing step of magnetizing the non-magnetized permanent magnet with the magnetized yoke when the vibration frequency of the permanent magnet reaches a steady state. A method of magnetizing a permanent magnet according to claim 8,
In the magnetizing step, after the vibrator of the permanent magnet is in a steady state, the adhesive is thermally cured. A method for magnetizing a permanent magnet according to claim 8 or 9, wherein
After completion of the magnetizing step, a permanent magnet magnetizing method is provided, wherein a balance correcting step is performed in which a hole that does not penetrate through the plate is formed to correct the rotational axis fluctuation of the rotor.

Images