Motor and drive system

Abstract

To provide a drive system and a motor including a sensor, maintenance of which is easy.SOLUTION: A motor 10 comprises a rotor 12, a motor housing 20, an output shaft 14 protruding from the rotor 12 to the outside of the motor housing 20 along a rotation axis line 11 and being connected to a load 2, a flange member 50 rotatably fitted to the circumference of the output shaft 14 at a position apart from the motor housing 20, a cover member 60 surrounding a space between the flange member 50 and the motor housing 20 around the rotation axis line 11 and detachably attached to the flange member 50 and the motor housing 20, and a sensor 30 housed in the space to detect rotation of the output shaft 14. The cover member 60 is slidable with respect to the flange member 50 toward a protruding direction of the output shaft 14 so as to make the sensor 30 be exposed in a state of being detached from the flange member 50 and the motor housing 20.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to motors and drive systems. [Background technology]

[0002] Patent Document 1 discloses a brushless motor that includes a case and bracket that house and hold a rotor, and a resolver that detects the rotational position of the rotor within the bracket. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-23840 Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure provides a motor and drive system that allows for easy sensor maintenance. [Means for solving the problem]

[0005] A motor according to one aspect of the present disclosure comprises a rotor that rotates about a rotational axis, a motor housing that accommodates the rotor and holds it along the rotational axis, an output shaft that protrudes from the rotor to the outside of the motor housing along the rotational axis and is connected to a load, a flange member rotatably attached to the outer periphery of the output shaft at a position away from the motor housing, a cover member that surrounds the space between the flange member and the motor housing around the rotational axis and is detachably attached to the flange member and the motor housing, and a sensor housed in the space, and when removed from the flange member and the motor housing, the cover member is slidable relative to the flange member in the direction in which the output shaft protrudes so as to expose the sensor.

[0006] A drive system according to another aspect of the present disclosure comprises the above-mentioned motor, a load, and a coupling attached to the outer periphery of the output shaft and connecting the output shaft and the load, wherein the outer diameter of the flange member is larger than the outer diameter of the coupling, and the inner diameter of the cover member is larger than the outer diameter of the coupling. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a motor and a drive system in which the maintenance of the rotation sensor is easy. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view illustrating the configuration of a drive system. [Figure 2] 2 is an enlarged view illustrating the sensor cover unit in FIG. 1. FIG. [Figure 3] 3 is a diagram illustrating a state in which a cover member in FIG. 2 is slid. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, the embodiments will be described in detail with reference to the drawings. In the description, the same elements or elements having the same functions are denoted by the same reference numerals, and redundant description will be omitted.

[0010] The drive system 1 shown in Fig. 1 includes a load 2, a motor 10, and a coupling 70. There are no particular limitations on the load 2, and it may be anything as long as it is rotationally driven by the motor 10. As an example, the load 2 is a reel that winds up a lifting wire in a winch of a crane that lifts and lowers a basket or pallet carrying an object to be transported. Other examples of the load 2 include the rotating blades of a pump or a fan, or wheels.

[0011] The motor 10 is, for example, an electric motor, and consumes power to drive the load 2. For example, the motor 10 generates rotational torque for driving the load 2 in response to the supply of power. The motor 10 has a rotor 12, a stator 13, a motor housing 20, and an output shaft 14. The rotor 12 rotates around a rotation axis 11. In the drawing, the rotation axis 11 is horizontal, but the orientation of the rotation axis 11 is not necessarily limited to being horizontal.

[0012] Stator 13 surrounds rotor 12 and rotates rotor 12 around rotation axis 11. For example, motor 10 is a synchronous motor, and has an armature coil in stator 13 and a field magnet in rotor 12. Stator 13 applies rotational torque to stator 13 in response to power supply to the armature coil. Motor 10 may have an armature coil in rotor 12 and a field magnet in stator 13.

[0013] The motor 10 may be an induction motor, and may have a primary coil on the stator 13 and a secondary coil on the rotor 12. The motor 10 may have a primary coil on the rotor 12 and a secondary coil on the stator 13.

[0014] The motor housing 20 accommodates the rotor 12 and the stator 13 and is fixed near the load 2. For example, if the load 2 is a winch reel, the motor housing 20 is fixed to the frame of the winch. The motor housing 20 holds the rotor 12 along the rotation axis 11 so that the rotor 12 is rotatable about the rotation axis 11. For example, the motor housing 20 has a frame 21 and end brackets 22 and 23. The frame 21 is a tubular member that surrounds the rotor 12 and the stator 13 about the rotation axis 11. The frame 21 is not limited to being a cylindrical member. For example, the frame 21 may be a tubular member with a polygonal cross section. The stator 13 is fixed to the inner periphery of the frame 21. The end brackets 22 and 23 close both ends of the frame 21.

[0015] The output shaft 14 protrudes from the rotor 12 to the outside of the motor housing 20 along the rotation axis 11 and is connected to the load 2. For example, the output shaft 14 protrudes to the outside of the motor housing 20 through a shaft hole 24 formed in the end bracket 22. The motor 10 may further include a second output shaft 15. The second output shaft 15 protrudes to the outside of the motor housing 20 from the rotor 12 in the direction opposite to the protruding direction of the output shaft 14. For example, the second output shaft 15 protrudes to the outside of the motor housing 20 through a shaft hole 25 formed in the end bracket 23.

[0016] The end bracket 22 holds the output shaft 14 from its outer periphery via a bearing 16 disposed in a shaft hole 24. The end bracket 23 holds the second output shaft 15 from its outer periphery via a bearing 17 disposed in a shaft hole 25. These hold the rotor 12 so that it can rotate freely along and around the rotation axis 11. The bearings 16, 17 are, for example, roller bearings, ball bearings, or sleeve bearings.

[0017] The output shaft 14, which protrudes from the end bracket 22 to the outside of the motor housing 20, is connected to the load 2 via a coupling 70. The coupling 70 is attached to the outer periphery of the output shaft 14 and connects the output shaft 14 to the load 2. For example, the coupling 70 has a hub 71 and a flange 72. The hub 71 is cylindrical and attached to the outer periphery of the output shaft 14. The hub 71 is attached to the outer periphery of the output shaft 14 with a key or the like to prevent relative rotation with respect to the output shaft 14. The flange 72 is connected to the tip of the hub 71 and extends outward (away from the rotation axis 11) from the outer periphery of the hub 71 around the entire circumference of the rotation axis 11. The flange 72 is fixed to the load 2 with one or more fastening members, such as bolts, in the direction in which the output shaft 14 protrudes. The term "tip" refers to the distal end relative to the motor housing 20. This also applies hereinafter.

[0018] In addition to the output shaft 14 being connected to the load 2, the second output shaft 15 may be connected to a second load 3. In this case, it is possible to drive the load 2 and the second load 3 synchronously. An example of the load 2 and the second load 3 being driven synchronously is a pair of reels in a crane winch that respectively winds up a pair of wires for lifting and lowering.

[0019] For example, the drive system 1 may further include a second coupling 80, and the second output shaft 15 may be connected to the second load 3 via the second coupling 80. The second coupling 80 is attached to the outer periphery of the second output shaft 15 and connects the second output shaft 15 and the second load 3. For example, the second coupling 80 has a second hub 81 and a second flange 82. The second hub 81 is cylindrical and attached to the outer periphery of the second output shaft 15. The second hub 81 is attached to the outer periphery of the second output shaft 15 with a key or the like so as not to rotate relative to the second output shaft 15. The second flange 82 is connected to the tip of the second hub 81 and extends outward (away from the rotation axis 11) from the outer periphery of the second hub 81 around the entire circumference of the rotation axis 11. The second flange 82 is fixed to the second load 3 by one or more fastening members, such as bolts, in the direction in which the second output shaft 15 protrudes.

[0020] The sensor 30 is, for example, a rotation sensor, and detects the rotation of the output shaft 14 between the coupling 70 and the motor housing 20 (between the coupling 70 and the end bracket 22). Detecting the rotation includes generating an electrical signal corresponding to the rotation of the output shaft 14. For example, the sensor 30 is a pulse generator, and generates a pulsed electrical signal corresponding to the rotation of the output shaft 14.

[0021] For example, the sensor 30 has a code disk 31 and a sensor head 32. The code disk 31 is attached to the outer periphery of the output shaft 14 and rotates together with the output shaft 14. The code disk 31 has a plurality of sectors arranged at regular intervals along the circumferential direction around the rotation axis 11. The sensor head 32 is attached to the end bracket 22 so as to be positioned around the code disk 31. The sensor head 32 generates a pulse-like electrical signal each time each of the plurality of sectors passes by the sensor head 32 as the code disk 31 rotates. This generates a pulse signal with a frequency proportional to the rotational speed of the code disk 31.

[0022] Each of the plurality of sectors may be an optically readable mark, and the sensor head 32 may be an optical sensor. Each of the plurality of sectors may be a magnetically readable mark, and the sensor head 32 may be a Hall sensor.

[0023] The rotation sensor is not necessarily limited to a pulse generator as long as it detects at least the rotation of the output shaft 14. For example, the rotation sensor may be a tachometer generator or a resolver. The sensor 30 is not necessarily limited to a rotation sensor. For example, the sensor 30 may be a sensor that detects the environment around the output shaft 14, such as a temperature sensor or a pressure sensor.

[0024] To protect the sensor 30, the motor 10 further includes a sensor cover unit 40. The sensor cover unit 40 covers the sensor 30 from both the outer circumferential direction of the output shaft 14 and the protruding direction of the output shaft 14.

[0025] To perform maintenance on the sensor 30, the sensor cover unit 40 must be removed from around the sensor 30 to expose the sensor 30. For example, by sliding the sensor cover unit 40 in the direction in which the output shaft 14 protrudes and exposing the sensor 30 in the outer circumferential direction of the output shaft 14, maintenance on the sensor 30 (e.g., inspection, repair, or replacement of the code disk 31 or the sensor head 32) can be performed. However, the sliding of the sensor cover unit 40 in the direction in which the output shaft 14 protrudes may be restricted by the coupling 70 or the like. If the sliding of the sensor cover unit 40 is restricted by the coupling 70, the load 2 and the coupling 70 must be removed from the output shaft 14 to perform maintenance on the sensor 30. This makes the maintenance work on the sensor 30 extensive.

[0026] In contrast, the sensor cover unit 40, as shown in FIG. 2, has a flange member 50 and a cover member 60. The flange member 50 is rotatably attached to the outer periphery of the output shaft 14 at a position away from the motor housing 20 (end bracket 22). The flange member 50 extends outward (away from the rotation axis 11) from the output shaft 14 around the entire circumference of the rotation axis 11. For example, the flange member 50 has a flange main body 51 and a seal member 52. The flange main body 51 is an annular plate that surrounds the output shaft 14. The seal member 52 is attached to the flange main body 51 so as to seal the gap between the inner circumferential surface of the flange main body 51 and the outer circumferential surface of the output shaft 14 over the entire circumference. For example, the seal member 52 is a mechanical seal that closely contacts the outer circumferential surface of the output shaft 14 while allowing the output shaft 14 to rotate relative to the flange main body 51. The seal member 52 does not necessarily have to be in close contact with the outer peripheral surface of the output shaft 14 , and a gap may be formed between the seal member 52 and the outer peripheral surface of the output shaft 14 .

[0027] The sensor 30 is housed in a space 41 between the flange member 50 and the motor housing 20 (end bracket 22). The cover member 60 surrounds the space 41 between the flange main body 51 and the end bracket 22 around the rotation axis 11, and is detachably attached to the flange member 50 and the end bracket 22. The cover member 60 may surround the space 41 over the entire circumference around the rotation axis 11, or may surround the space 41 partially around the rotation axis 11. When removed from the flange main body 51 and the end bracket 22, the cover member 60 is slidable relative to the flange member 50 in the direction in which the output shaft 14 protrudes, so as to expose the sensor 30 toward the outer periphery.

[0028] In this way, because the sensor cover unit 40 is configured to be separated into two bodies, the flange member 50 and the cover member 60, the inner diameter of the cover member 60 can be made larger than the outer diameter of the coupling 70 attached to the output shaft 14 for connection to the load 2, and the cover member 60 can be slid with the coupling 70 attached to it, exposing the sensor 30 in the outer circumferential direction. This makes maintenance of the sensor 30 easy.

[0029] For example, the outer diameter of the flange member 50 is larger than the outer diameter of the coupling 70, and the inner diameter of the cover member 60 is larger than the outer diameter of the coupling 70. This allows maintenance of the sensor 30 to be performed without removing the coupling 70 from the output shaft 14.

[0030] The outer diameter of the coupling 70 does not necessarily have to be the maximum outer diameter of the coupling 70, but may be the outer diameter of the portion of the coupling 70 closest to the end bracket 22. For example, the outer diameter of the coupling 70 may be the outer diameter of the portion of the coupling 70 excluding the flange 72 (for example, the outer diameter of the hub 71).

[0031] The cover member 60 may have a sleeve 61, a first flange 62, and a second flange 63. The sleeve 61 is a cylindrical member extending from around the flange member 50 to the end bracket 22. The first flange 62 extends outward (away from the rotation axis 11) from an end (base end) of the sleeve 61 facing the end bracket 22, and is attached to the end bracket 22 from the direction in which the output shaft 14 protrudes. The first flange 62 extends inward (closer to the rotation axis 11) from an end (tip end) of the sleeve 61 facing away from the end bracket 22, and is attached to the flange member 50 from the direction in which the output shaft 14 protrudes. By bringing the end bracket 22 and the cover member 60 into surface contact from the direction in which the output shaft 14 protrudes, and by bringing the cover member 60 into surface contact with the flange member 50, the gap between the end bracket 22 and the cover member 60 can be easily reduced, and the gap between the cover member 60 and the flange member 50 can be easily reduced. When the cover member 60 includes the first flange 62 and the second flange 63, the inner diameter of the second flange 63 is larger than the outer diameter of the coupling 70 (the outer diameter of the hub 71).

[0032] The flange member 50 may have one or more pins 53, and the second flange 63 may have one or more holes 64. The one or more pins 53 protrude from the flange main body 51 in the protruding direction of the output shaft 14. The one or more holes 64 respectively receive the one or more pins 53.

[0033] The cover member 60 can be attached to the end bracket 22 and the flange member 50 with one or more pins 53 passing through one or more holes 64, respectively. This prevents the flange member 50 from rotating during attachment of the cover member 60, making it easier to attach the cover member 60. The flange member 50 may have a plurality of pins 53 arranged circumferentially around the rotation axis 11. Correspondingly, the second flange 63 may have a plurality of holes 64 corresponding to the plurality of pins 53, respectively.

[0034] A male thread 55 may be formed on the outer periphery of each of the one or more pins 53, around an axis parallel to the rotation axis 11. The second flange 63 may be attached to the flange main body 51 from the protruding direction of the output shaft 14 by tightening a nut 91 onto the male thread 55. By utilizing the one or more pins 53 as fastening members, the number of parts can be reduced.

[0035] For example, the flange body 51 has one or more female threaded holes 54. One or more bolts 92 are screwed into the one or more female threaded holes 54 in the direction in which the output shaft 14 projects. The one or more bolts 92 project from the one or more female threaded holes 54 in the direction in which the output shaft 14 projects. The portions of the one or more bolts 92 that project from the one or more female threaded holes 54 respectively constitute one or more pins 53. The one or more bolts 92 may be fixed in the one or more female threaded holes 54 by, for example, adhesive or the like.

[0036] The first flange 62 may be attached to the end bracket 22 from the protruding direction of the output shaft 14 by one or more bolts 93. For example, the end bracket 22 may have one or more female threaded holes 26 into which the one or more bolts 93 are respectively screwed, and the first flange 62 may have one or more holes 65 through which the one or more bolts 93 are respectively passed. The end bracket 22 may have a plurality of female threaded holes 26 arranged in a circumferential direction around the rotation axis 11. Correspondingly, the first flange 62 may have a plurality of holes 65 corresponding to the plurality of female threaded holes 26, respectively.

[0037] In the protruding direction of the output shaft 14, the length L1 from the tip 66 of the cover member 60 attached to the flange member 50 and the end bracket 22 to the tip 73 of the coupling 70 may be longer than the sliding length L2 of the cover member 60 to expose the sensor 30. With this length relationship, as shown in FIG. 3 , the sensor 30 can be exposed by sliding the cover member 60 to the outer periphery of the coupling 70. This further improves the ease of maintenance of the sensor 30, which can be performed without removing the coupling 70 from the output shaft 14. The tip 73 of the coupling 70 may be the tip of a portion excluding the flange 72 (e.g., the hub 71). Exposing the sensor 30 means exposing the entire area of ​​the sensor 30 in the direction along the rotation axis 11 toward the outer periphery of the output shaft 14.

[0038] The overall length of the hub 71 in the direction along the rotation axis 11 may be longer than the overall length of the cover member 60. This can further improve the workability of maintenance of the sensor 30.

[0039] The length L3 by which the output shaft 14 protrudes from the cover member 60 attached to the flange member 50 and the end bracket 22 may be longer than the sliding length L2 of the cover member 60 to expose the sensor 30. This length relationship also further improves the ease of maintenance of the sensor 30.

[0040] The above-described exemplary embodiment includes the following configurations. (1) A motor 10 comprising: a rotor 12 that rotates about a rotation axis 11; a motor housing 20 that houses the rotor 12 and holds it along the rotation axis 11; an output shaft 14 that protrudes from the rotor 12 to the outside of the motor housing 20 along the rotation axis 11 and is connected to a load 2; a flange member 50 that is rotatably attached to the outer periphery of the output shaft 14 at a position away from the motor housing 20; a cover member 60 that surrounds the space between the flange member 50 and the motor housing 20 around the rotation axis 11 and is detachably attached to the flange member 50 and the motor housing 20; and a sensor 30 that is housed in the space and detects rotation of the output shaft 14, wherein the cover member 60 is slidable relative to the flange member 50 in the protruding direction of the output shaft 14 so as to expose the sensor 30 when removed from the flange member 50 and the motor housing 20. If it were necessary to detach the output shaft 14 from the load 2 to remove the sensor 30, maintenance of the sensor 30 would be extensive. In contrast, in this motor 10, the member that covers the storage space for the rotation angle sensor outside the motor housing 20 is divided into two members: a flange member 50 and a cover member 60. This makes it possible to make the inner diameter of the cover member 60 larger than the outer diameter of the connecting member (e.g., coupling 70) attached to the output shaft 14 for connection to the load 2, and to slide the cover member 60 with the connecting member attached to expose the sensor 30. This makes maintenance of the sensor 30 easy.

[0041] (2) The motor 10 described in (1), wherein the length by which the output shaft 14 protrudes from the cover member 60 attached to the flange member 50 and the motor housing 20 is longer than the sliding length of the cover member 60 to expose the sensor 30. Maintenance of the sensor 30 is also easier.

[0042] (3) The cover member 60 of the motor 10 described in (1) or (2) has a sleeve 61 extending from around the flange member 50 to the motor housing 20, a first flange 62 extending outward from the end of the sleeve 61 facing the motor housing 20 and attached to the motor housing 20 from the direction in which the output shaft 14 protrudes, and a second flange 63 extending inward from the end of the sleeve 61 facing away from the motor housing 20 and attached to the flange member 50 from the direction in which the output shaft 14 protrudes. By bringing the motor housing 20 and the cover member 60 into surface contact from the protruding direction of the output shaft 14, and by bringing the cover member 60 into surface contact with the flange member 50, the gap between the motor housing 20 and the cover member 60 can be easily reduced, and the gap between the cover member 60 and the flange member 50 can be easily reduced.

[0043] (4) A motor 10 as described in (3), wherein the flange member 50 has one or more pins 53 protruding in the direction of protrusion of the output shaft 14, and the second flange 63 has one or more holes 64 through which the one or more pins 53 pass, respectively. The cover member 60 can be attached to the motor housing 20 and the flange member 50 with one or more pins 53 passing through one or more holes 64. This makes it possible to prevent the flange member 50 from rotating during attachment of the cover member 60, thereby improving ease of attachment of the cover member 60.

[0044] (5) The motor 10 according to (4), wherein a male thread 55 is formed on the outer periphery of each of the one or more pins 53 , and the second flange 63 is attached to the flange member 50 by tightening a nut 91 onto the male thread 55 . By utilizing the pin 53 as a fastening member, the number of parts can be reduced.

[0045] (6) The motor 10 described in (1) or (2) further includes a second output shaft 15 that protrudes from the rotor 12 to the outside of the motor housing 20 in the direction opposite to the protruding direction of the output shaft 14 and is connected to a second load 3. The ease of maintenance of the sensor 30 is further beneficial, since maintenance of the sensor 30 can be performed with the motor 10 connected to both the load 2 and the second load 3 .

[0046] (7) A drive system 1 comprising a motor 10 according to (1) or (2), a load 2, and a coupling 70 attached to the outer periphery of the output shaft 14 and connecting the output shaft 14 and the load 2, wherein the outer diameter of the flange member 50 is larger than the outer diameter of the coupling 70, and the inner diameter of the cover member 60 is larger than the outer diameter of the coupling 70. Maintenance of the sensor 30 can be performed without removing the coupling 70 from the output shaft 14.

[0047] (8) A drive system 1 described in (7), in which the length from the tip 66 of the cover member 60 attached to the flange member 50 and the motor housing 20 to the tip 66 of the coupling 70 in the protruding direction of the output shaft 14 is longer than the sliding length of the cover member 60 to expose the sensor 30. This further improves the workability of maintenance of the sensor 30, which can be performed without removing the coupling 70 from the output shaft 14. Although the embodiments have been described above, the present invention is not necessarily limited to the above-described embodiments, and various modifications are possible without departing from the spirit of the present invention. [Explanation of symbols]

[0048] 1...drive system, 2...load, 10...motor, 11...rotational axis, 12...rotor, 20...motor housing, 14...output shaft, 15...second output shaft, 70...coupling, 3...second load, 30...sensor, 50...flange member, 60...cover member, 61...sleeve, 62...first flange, 63...second flange, 53...pin, 64...hole, 55...male thread, 91...nut, 73...tip, 66...tip.

Claims

1. a rotor that rotates around a rotation axis; a motor housing that accommodates the rotor and holds it along the rotation axis; an output shaft that protrudes from the rotor along the rotation axis to the outside of the motor housing and is connected to a load; a flange member rotatably attached to the outer periphery of the output shaft at a position spaced from the motor housing; a cover member that surrounds a space between the flange member and the motor housing around the rotation axis and is detachably attached to the flange member and the motor housing; a sensor housed in the space; Equipped with The cover member is slidable relative to the flange member in the direction in which the output shaft protrudes so as to expose the sensor when the cover member is removed from the flange member and the motor housing.

2. a length by which the output shaft projects from the cover member attached to the flange member and the motor housing is longer than a sliding length of the cover member for exposing the sensor; The motor according to claim 1.

3. The cover member is a sleeve extending from the periphery of the flange member to the motor housing; a first flange that extends outward from an end of the sleeve that faces the motor housing and is attached to the motor housing from a protruding direction of the output shaft; a second flange extending inward from an end of the sleeve that faces away from the motor housing and attached to the flange member from a protruding direction of the output shaft; having 3. The motor according to claim 1 or 2.

4. The flange member has one or more pins that protrude in the direction in which the output shaft protrudes, the second flange has one or more holes through which the one or more pins pass, respectively; The motor according to claim 3.

5. a male thread is formed on the outer periphery of each of the one or more pins; The second flange is attached to the flange member by tightening a nut onto the male thread. The motor according to claim 4.

6. a second output shaft that protrudes from the rotor to the outside of the motor housing in a direction opposite to the protruding direction of the output shaft and is connected to a second load; 3. The motor according to claim 1 or 2.

7. a motor according to claim 1 or 2; the load; a coupling attached to the outer periphery of the output shaft and connecting the output shaft to a load; Equipped with The outer diameter of the flange member is larger than the outer diameter of the coupling, The cover member has an inner diameter greater than an outer diameter of the coupling.

8. a length from a tip of the cover member attached to the flange member and the motor housing to a tip of the coupling in a protruding direction of the output shaft is longer than a sliding length of the cover member for exposing the sensor; The drive system of claim 7.

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