Magnetic generating unit, rotation angle detecting device, and rotating electric machine

Abstract

A magnetic generating unit capable of improving the detection accuracy of a rotation angle is provided. The unit comprises: a shell formed of a non-magnetic body and having a cylindrical portion with at least one end open; and a magnetic generating body filled in the shell in a state where a portion that does not contact the inner circumferential surface of the cylindrical portion is formed on the open end side of the cylindrical portion, and magnetized in a direction perpendicular to the axial direction of the shell. According to this structure, the magnetic generating body is filled in the shell in a state where a portion that does not contact the inner circumferential surface of the cylindrical portion is formed on the open end side of the cylindrical portion. Therefore, the detection accuracy of the rotation angle can be maintained.

Description

Technical Field

[0001] The present invention relates to a magnetism generating unit, a rotation angle detecting device and a rotating electric machine. Background Art

[0002] Patent Document 1 discloses a magnetism generating unit that has excellent durability against a temperature fluctuation environment.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2016-153765 Summary of the invention

[0006] Problems to be solved by the invention

[0007] However, it is difficult to position the magnetic generating unit described in Patent Document 1 when fixing it to the rotating shaft of the rotating electrical machine. Therefore, the detection accuracy of the rotation angle may not be maintained.

[0008] The present invention has been made to solve the above-mentioned problems and has an object to provide a magnetic generating unit, a rotation angle detecting device, and a rotating electrical machine capable of maintaining the detection accuracy of the rotation angle.

[0009] Means for solving problems

[0010] The magnetic generating unit of the present invention comprises: a shell, which is formed by a non-magnetic body and has a cylindrical portion with at least one end open; and a magnetic generating body, which is filled in the shell in a state of forming a portion that does not contact the inner circumferential surface of the cylindrical portion on the open end side of the cylindrical portion and is magnetized in a direction perpendicular to the axial direction of the shell.

[0011] The rotation angle detection device of the present invention includes the magnetism generating unit and a magnetic sensor facing the magnetism generating body.

[0012] The rotating electric machine of the present invention comprises: a casing which serves as an outer shell; a stator which is arranged on the casing; a rotating shaft which is rotatably arranged on the casing; a rotor which is arranged on the rotating shaft; the magnetic generating unit which is arranged at the end of the rotating shaft to protrude on the open end side of the cylindrical portion; and a magnetic sensor which is opposite to the magnetic generating body.

[0013] Effects of the Invention

[0014] According to these inventions, the magnetic generating body is filled in the housing on the open end of the cylindrical portion so as to form a portion that does not contact the inner peripheral surface of the cylindrical portion. Therefore, the detection accuracy of the rotation angle can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a front view of a main part of an elevator car to which the rotating electrical machine according to the first embodiment is applied.

[0016] Figure 2 This is a longitudinal sectional view of a main part of an elevator car to which the rotating electrical machine according to the first embodiment is applied.

[0017] Figure 3 It is a longitudinal sectional view of the rotating electrical machine in Embodiment 1.

[0018] Figure 4 This is a front view of the magnetism generating unit of the rotating electrical machine in the first embodiment.

[0019] Figure 5 It is along Figure 4 Cross-sectional view along line AA.

[0020] Figure 6 It is along Figure 4 Cross-sectional view of line BB.

[0021] Figure 7 It is a front view of the magnetism generating unit of the rotating electrical machine in the second embodiment.

[0022] Figure 8 It is along Figure 7 Cross-sectional view of the CC line.

[0023] Fig. 9 It is a front view of the magnetism generating unit of the rotating electrical machine in the third embodiment. DETAILED DESCRIPTION

[0024] The embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in each figure, the same reference numerals are given to the same or corresponding parts, and the repeated description of the parts is appropriately simplified or even omitted.

[0025] Implementation Method 1

[0026] Figure 1 This is a front view of a main part of an elevator car to which the rotating electrical machine according to the first embodiment is applied. Figure 2 This is a longitudinal sectional view of a main part of an elevator car to which the rotating electrical machine according to the first embodiment is applied.

[0027] exist Figure 1 In the figure, the elevator car 1 is provided so as to be able to go up and down inside a hoistway (not shown).

[0028] The pair of car doors 2 are double-opening type. One of the car doors 2 is arranged on one side of the entrance and exit of the car 1. The other of the car doors 2 is arranged on the other side of the entrance and exit of the car 1. Figure 1 In the embodiment, a pair of car doors 2 are completely closed.

[0029] One of the car doors 2 is provided with a pair of door shoes 2a. The pair of door shoes 2a are respectively provided at the lower part of one of the car doors 2. The pair of door shoes 2a are respectively connected to one of the car doors 2 via the leg parts.

[0030] The other side of the car door 2 is provided with a pair of door shoes 2b. The pair of door shoes 2b are respectively provided at the lower part of the other side of the car door 2. The pair of door shoes 2b are respectively connected to the other side of the car door 2 via the leg part.

[0031] The car sill 3 is provided at the lower part of the entrance and exit of the car 1. The car sill 3 has a groove 4. The groove 4 is formed so as to be able to guide the pair of door shoes 2a and the pair of door shoes 2b.

[0032] The lower end of one side of the door hanger 5 is connected to the upper end of one side of the car door 2. One side of the front roller 6 is provided at the front end of one side of the door hanger 5. One side of the rear roller 7 is provided at the rear end of one side of the door hanger 5. One side of the connecting member 8 is provided between one side of the front roller 6 and one side of the rear roller 7. The lower end of one side of the connecting member 8 is connected to the upper end of one side of the door hanger 5.

[0033] The lower end of the other side of the door hanger 5 is connected to the upper end of the other side of the car door 2. The other side of the front roller 6 is provided at the front end of the other side of the door hanger 5. The other side of the rear roller 7 is provided at the rear end of the other side of the door hanger 5. The other side of the connecting member 8 is provided between the other side of the front roller 6 and the other side of the rear roller 7. The lower end of the other side of the connecting member 8 is connected to the upper end of the other side of the door hanger 5.

[0034] The hanger rail 9 is provided above the entrance and exit of the car 1. The length direction of the hanger rail 9 is set to the horizontal direction. The hanger rail 9 supports one side of the front roller 6, one side of the rear roller 7, the other side of the front roller 6, and the other side of the rear roller 7 from below.

[0035] One of the pulleys 10 is provided above one end of the hanger rail 9 . The other of the pulleys 10 is provided above the other end of the hanger rail 9 .

[0036] The belt V is wound around a pair of pulleys 10. The lower side of the belt V is connected to one upper end of the pair of coupling tools 8. The upper side of the belt V is connected to the other upper end of the pair of coupling tools 8.

[0037] The rotating motor 11 is provided as a door motor. The rotating motor 11 is provided below the ceiling 1a of the car 1. The rotating motor 11 is provided above one end of the hanger rail 9. The rotating shaft of the rotating motor 11 rotatably supports one side of the pulley 10.

[0038] One of the pair of pulleys 10 rotates following the rotation of the rotating shaft of the rotary electric machine 11. The belt V circulates following the rotation of one of the pair of pulleys 10. The pair of coupling members 8 moves in opposite directions following the circulation of the belt V.

[0039] The pair of door hangers 5 move in opposite directions to each other, respectively, following the pair of coupling members 8. The pair of car doors 2 move in opposite directions to each other, respectively, following the pair of door hangers 5.

[0040] Next, use Figure 3 The rotating electrical machine 11 will be described.

[0041] Figure 3 It is a longitudinal sectional view of the rotating electrical machine in Embodiment 1.

[0042] like Figure 3 As shown, in the rotating electrical machine 11, the housing 12 serves as an outer shell. The housing 12 includes a first shaft support portion 12a and a second shaft support portion 12b.

[0043] The first shaft support portion 12a is formed in a flat plate shape. The second shaft support portion 12b is formed in a flat plate shape. The first shaft support portion 12a and the second shaft support portion 12b face each other.

[0044] The first opening 12c is formed at the center of the first shaft support portion 12a. The first opening 12c is formed in a circular shape. The second opening 12d is formed at the center of the second shaft support portion 12b. The second opening 12d is formed in a circular shape.

[0045] The first bearing 13 is mounted in the first opening 12 c . The second bearing 14 is mounted in the second opening 12 d . The rotating shaft 15 is rotatably supported by the housing 12 via the first bearing 13 and the second bearing 14 .

[0046] The rotor 16 includes a rotor core 17 and a plurality of rotor magnets 18. The rotor core 17 is fixed to the rotating shaft 15. The plurality of rotor magnets 18 are fixed to the outer peripheral surface of the rotor core 17.

[0047] The stator 19 includes a stator core 20 and a plurality of stator coils 21. The stator core 20 is fixed to the housing 12. The stator core 20 faces the rotor core 17 with a gap therebetween. The plurality of stator coils 21 are wound around the stator core 20.

[0048] The rotating shaft 15 includes a first end portion 15 a and a second end portion 15 b .

[0049] The first end portion 15a is an end portion on the first shaft support portion 12a side in the axial direction. The first end portion 15a is held by the first bearing 13 inside the first opening 12c. The second end portion 15b is an end portion on the second shaft support portion 12b side in the axial direction. The second end portion 15b penetrates the second bearing 14 and protrudes to the outside of the housing 12.

[0050] The recessed portion 15c is formed at the center of the end surface on the first end portion 15a side. For example, the recessed portion 15c is formed in a circular shape.

[0051] The magnetic generating unit 22 is formed in a cylindrical shape. The magnetic generating unit 22 is provided inside the recessed portion 15c. For example, the magnetic generating unit 22 does not protrude from the end surface on the first end portion 15a side.

[0052] The magnetism generating unit 22 includes a housing 23 and a magnetism generating body 24 .

[0053] The housing 23 is formed of a non-magnetic body. For example, the housing 23 is formed of resin, aluminum, brass, etc. The housing 23 includes a cylindrical portion 23a and a bottom portion 23b. The bottom portion 23b closes one axial end of the cylindrical portion 23a.

[0054] The magnetism generating body 24 is accommodated in the housing 23. The magnetism generating body 24 is formed by injecting a bond magnet material into the housing 23 and then magnetizing it.

[0055] In order to detect the relative angle between the rotor magnet 18 and the stator coil 21, the magnetism generating body 24 is arranged at a certain angle with respect to the rotor magnet 18. The magnetism generating body 24 is positioned in the circumferential direction of the rotating shaft 15.

[0056] The housing 23 is fixed to the inside of the recess 15c by an adhesive. After the housing 23 is inserted into the recess 15c and before the adhesive is cured, the magnetic generator 24 is positioned in the circumferential direction. In this state, the adhesive is cured.

[0057] For example, the sensor substrate 25 is a printed circuit board. The sensor substrate 25 is fixed to the surface of the first shaft support part 12a on the side opposite to the second shaft support part 12b. For example, the sensor substrate 25 is fixed to the first shaft support part 12a by a plurality of bolts. The sensor substrate 25 closes the first opening 12c.

[0058] For example, the magnetic sensor 26 is a magnetoresistive element. The magnetic sensor 26 is provided on the sensor substrate 25. The magnetic sensor 26 faces the magnetism generating body 24 with a gap therebetween.

[0059] The magnetic generating unit 22, the sensor substrate 25 and the magnetic sensor 26 function as a rotation angle detection device 27. The rotation angle detection device 27 generates a signal corresponding to the rotation angle of the rotating shaft 15. When the rotating electrical machine 11 is a motor, the signal is sent to a control unit (not shown) that controls the rotation of the motor.

[0060] Next, use Figures 4 to 6 The magnetic generating unit 22 will be described.

[0061] Figure 4This is a front view of the magnetism generating unit of the rotating electrical machine in the first embodiment. Figure 5 It is along Figure 4 Cross-sectional view along line AA. Figure 6 It is along Figure 4 Cross-sectional view of line BB.

[0062] like Figure 4 and Figure 5 As shown, at least one end of the cylindrical portion 23a is opened in the housing 23. For example, a pair of cylindrical portions 23a are formed at the bottom of the cylindrical portion 23a at point-symmetrical positions about the central axis of the cylindrical portion 23a.

[0063] like Figure 6 As shown, at least one recess 23c is formed inside the cylindrical portion 23a in the housing 23. For example, at least one recess 23c is recessed from the inner circumferential surface side of the cylindrical portion 23a to the outside in a non-through manner. For example, at least one recess 23c is recessed from the bottom surface side of the cylindrical portion 23a to the outside in a non-through manner.

[0064] The magnetic generator 24 continuously fills the cylindrical portion 23a and at least the recessed portion 23c in a state where at least one space is formed on the open end side of the cylindrical portion 23a of the housing 23 without contacting the cylindrical portion 23a. Figure 4 As shown, the magnetic generating body 24 continuously fills the cylindrical portion 23a and the plurality of recesses 23c in a state where a pair of spaces are formed on the open end side of the cylindrical portion 23a of the housing 23 without contacting the cylindrical portion 23a. Figure 5 As shown in FIG. 1 , the magnetic generator 24 is filled so as to form a flush plane with the end surface of the open side of the cylindrical portion 23a of the housing 23. The magnetic generator 24 is magnetized in a direction perpendicular to the axial direction of the housing 23. For example, Figure 4 As shown, the magnetic generating body 24 is magnetized so that the boundary line between the N pole and the S pole is parallel to the arrangement direction of the pair of spaces and passes through the center line of the housing 23 .

[0065] According to the described embodiment 1, the magnetic generator 24 is filled in the housing 23 in a state where a space is formed on the open end side of the cylindrical portion 23a so as not to contact the cylindrical portion 23a. In this case, the circumferential positioning of the magnetic generator 24 is performed with a jig or the like inserted into the space. Therefore, the positioning of the magnetic generator 24 can be performed accurately. As a result, the detection accuracy of the rotation angle can be maintained.

[0066] Furthermore, the magnetic generator 24 is filled in the housing 23 in a state where a pair of spaces are formed on the open end side of the cylindrical portion 23a without contacting the cylindrical portion 23a. In this case, the circumferential positioning of the magnetic generator 24 is performed while inserting tweezers or the like into the plurality of spaces. Therefore, the positioning of the magnetic generator 24 can be performed more accurately. As a result, the detection accuracy of the rotation angle can be maintained more reliably.

[0067] Furthermore, the magnetic generator 24 is continuously filled in the cylindrical portion 23a and at least one recessed portion 23c of the housing 23. Therefore, the magnetic generator 24 can be prevented from moving and rotating toward the open end portion of the cylindrical portion 23a of the housing.

[0068] The shape and number of the spaces between the cylindrical portion 23 a of the housing 23 and the magnetism generating body 24 are not limited.

[0069] In addition, the magnet generating body 24 does not have to protrude from the housing 23 .

[0070] In addition, in the magnetic generating body 24, the direction of magnetization only needs to be the radial direction of the housing 23. For example, the direction of magnetization may be a direction perpendicular to the direction of magnetization in the first embodiment.

[0071] In addition, the rotary electric machine 11 can be configured to be thin. Therefore, if the rotary electric machine 11 is applied to the door motor of an elevator, the ceiling 21b can be made higher without changing the size of the door device, thereby improving the design of the car 1.

[0072] Implementation Method 2

[0073] Figure 7 It is a front view of the magnetism generating unit of the rotating electrical machine in the second embodiment. Figure 8 It is along Figure 7 sectional view taken along line CC of the embodiment 1. In addition, the same reference numerals are given to the same or corresponding parts as those in the embodiment 1. The description of such parts will be omitted.

[0074] In the magnet generator 24 of the second embodiment, the outer diameter of the portion protruding from the open end of the housing 23 is larger than the inner diameter of the cylindrical portion 23a of the housing 23 and smaller than the outer diameter of the cylindrical portion 23a.

[0075] According to the second embodiment described above, the outer diameter of the portion of the magnet generator 24 protruding from the open end of the housing 23 is larger than the inner diameter of the cylindrical portion 23a of the housing 23 and smaller than the outer diameter of the cylindrical portion 23a. In this case, the detection accuracy of the rotation angle can also be maintained.

[0076] Implementation 3

[0077] Fig. 9It is a front view of the magnetic field generating unit of the rotating electrical machine in Embodiment 3. In addition, the same reference numerals are attached to the parts which are the same as or correspond to those in Embodiment 1. The description of such parts will be omitted.

[0078] In the case 23 of the third embodiment, the plurality of cutouts 23d are arranged in the circumferential direction of the cylindrical portion 23a. The magnetic generating bodies 24 are not filled in the plurality of cutouts 23d.

[0079] The plurality of cutouts 23d are used as marks for the circumferential positioning of the magnetic generator 24. For example, a pair of cutouts 23d are provided on the cylindrical portion 23a. For example, a pair of cutouts 23d are formed at positions that are point-symmetrical about the central axis of the cylindrical portion 23a. For example, a pair of cutouts 23d are formed in a direction perpendicular to the magnetization direction. Specifically, a pair of cutouts 23d are formed on a straight line that is parallel to the boundary line between the N pole and the S pole of the magnetic generator 24 and passes through the center line of the cylindrical portion 23a.

[0080] According to the third embodiment described above, the pair of notches 23d are used as marks for circumferential positioning of the magnet generator 24. Therefore, the magnet generator 24 can be accurately positioned. As a result, the detection accuracy of the rotation angle can be maintained.

[0081] In addition, the number and shape of the cutouts 23d are not limited.

[0082] Furthermore, the rotating electrical machines 11 of Embodiments 1 to 3 may be applied to electric motors other than door motors of elevators, electric generators, generator motors, and the like.

[0083] Furthermore, the magnetic sensor 26 in the first to third embodiments may be a Hall element, a Hall IC, a magnetic encoder, or the like.

[0084] Industrial applicability

[0085] As described above, the magnetism generating unit, the rotation angle detecting device, and the rotating electric machine of the present invention can be used in an elevator system.

[0086] Description of symbols

[0087] 1: car; 1a: ceiling; 2: car door; 2a: door shoe; 2b: door shoe; 3: car sill; 4: groove; 5: door hanger; 6: front roller; 7: rear roller; 8: connecting piece; 9: hanger rail; 10: pulley; 11: rotating motor; 12: housing; 12a: first shaft support; 12b: second shaft support; 12c: first opening; 12d: second opening; 13: first bearing; 14: second bearing; 15: rotating Axis; 15a: 1st end; 15b: 2nd end; 15c: recess; 16: rotor; 17: rotor core; 18: rotor magnet; 19: stator; 20: stator core; 21: stator coil; 22: magnetic generating unit; 23: housing; 23a: cylindrical portion; 23b: bottom; 23c: recess; 23d: cutout; 24: magnetic generating body; 25: sensor substrate; 26: magnetic sensor; 27: rotation angle detection device.

Claims

1. A magnetic generating unit provided in a recessed portion formed at an end of a rotating shaft of a rotating electrical machine, the magnetic generating unit comprising: a housing formed of a non-magnetic body and having a cylindrical portion with at least one end open; and The magnet generating body is filled in the housing in a state where a space not in contact with the inner peripheral surface of the cylindrical portion is formed on the open end side of the cylindrical portion, and is magnetized in a direction perpendicular to the axial direction of the housing.

2. The magnetic generating unit according to claim 1, wherein: The magnetism generating unit is filled in a state where a plurality of spaces that do not contact the inner peripheral surface of the cylindrical portion are formed on the open end side of the cylindrical portion.

3. The magnetic generating unit according to claim 1, wherein: The housing has a recessed portion which is recessed from the inner peripheral surface side of the cylindrical portion toward the outside in a non-penetrating manner. The magnet generating body is continuously filled in the cylindrical portion and the recessed portion in a state where a space is formed without contacting the inner peripheral surface of the cylindrical portion.

4. The magnetic generating unit according to claim 2, wherein: The housing has a recessed portion which is recessed from the inner peripheral surface side of the cylindrical portion toward the outside in a non-penetrating manner. The magnet generating body is continuously filled in the cylindrical portion and the recessed portion in a state where a space is formed without contacting the inner peripheral surface of the cylindrical portion.

5. The magnetic generating unit according to claim 1, wherein: The housing has a plurality of recessed portions, which are recessed from the inner peripheral surface side of the cylindrical portion toward the outside in a non-penetrating manner. The magnet generating body is continuously filled in the cylindrical portion and the plurality of recessed portions in a state where a space is formed without contacting the inner peripheral surface of the cylindrical portion.

6. The magnetic generating unit according to claim 2, wherein: The housing has a plurality of recessed portions, which are recessed from the inner peripheral surface side of the cylindrical portion toward the outside in a non-penetrating manner. The magnet generating body is continuously filled in the cylindrical portion and the plurality of recessed portions in a state where a space is formed without contacting the inner peripheral surface of the cylindrical portion.

7. The magnetic generating unit according to any one of claims 1 to 6, wherein: The magnet generator is filled so as to protrude beyond the open end of the cylindrical portion.

8. The magnetic generating unit according to claim 7, wherein: The outer diameter of a portion of the magnet generator that protrudes from the open end of the cylindrical portion is larger than the inner diameter of the cylindrical portion of the case and is smaller than the outer diameter of the cylindrical portion of the case.

9. The magnetic generating unit according to any one of claims 1 to 6, wherein: The housing includes a pair of cutouts formed on the open end side of the cylindrical portion at positions perpendicular to the magnetization direction of the magnetic generator. The magnetism generating body is not filled in the pair of cutouts.

10. The magnetic generating unit according to claim 7, wherein: The housing includes a pair of cutouts formed on the open end side of the cylindrical portion at positions perpendicular to the magnetization direction of the magnetic generator. The magnetism generating body is not filled in the pair of cutouts.

11. The magnetic generating unit according to claim 8, wherein: The housing includes a pair of cutouts formed on the open end side of the cylindrical portion at positions perpendicular to the magnetization direction of the magnetic generator. The magnetism generating body is not filled in the pair of cutouts.

12. A rotation angle detection device comprising: The magnetic generating unit according to any one of claims 1 to 11; and The magnetic sensor is disposed opposite to the magnetic generating body.

13. A rotating electrical machine comprising: The outer shell, which becomes the outer shell; a stator, which is disposed on the housing; A rotating shaft rotatably disposed on the housing; a rotor disposed on the rotating shaft; The magnetic generating unit according to any one of claims 1 to 11, which is provided at the end of the rotating shaft on the side close to the open end of the cylindrical portion; and The magnetic sensor is disposed opposite to the magnetic generating body.

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