Motor with non-energized operating brake

Abstract

To provide a motor with a non-excitation operation brake which can be made compact in the axial direction.SOLUTION: A motor 1 with a non-excitation operation brake includes a motor part 2, a brake part 3, and a housing part 4. The motor unit 2 includes a stator 21, a rotor 23 disposed radially inside the stator 21, and a rotary shaft 25 that rotates integrally with the rotor 23. The brake unit 3 includes a friction plate 31, an armature 32, a braking spring 33, an electromagnet 34, and a side plate 35. The side plate 35 is fixed to the stator 21 of the motor portion 2. The side plate 35 may be fixed to the stator 21 of the motor portion 2.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a motor with a brake that operates without excitation. [Background technology]

[0002] Patent Document 1 discloses a non-excitation brake. This type of non-excitation brake includes a friction plate that rotates integrally with the rotating shaft of the motor, a side plate, an armature, a braking spring, and an electromagnet that attracts the armature away from the friction plate when current is applied.

[0003] In the above-mentioned non-excitation operating brake, when the electromagnet is not energized, the armature is urged toward the friction plate by the braking spring, and the friction plate is sandwiched between the armature and the side plate, thereby holding the rotating shaft stationary.

[0004] When the electromagnet is energized, the armature is attracted away from the friction plate, thereby releasing the braking force of the non-excitation brake. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-130340 Summary of the Invention [Problem to be solved by the invention]

[0006] In the conventional non-excitation operating brake described above, the side plate is fixed to the core of the electromagnet using a screw.

[0007] Therefore, in conventional non-excitation operating brakes, it was necessary to position the friction plates so as to avoid the fixing screws, and it was not possible to install large friction plates (i.e., friction plates with large diameters).

[0008] In conventional non-excitation brakes, it is not possible to install large-diameter friction plates as described above, so the brake spring must apply a large biasing force to the armature. This makes it difficult to reduce the size of the brake spring and the electromagnet's excitation coil. As a result, it is difficult to reduce the overall size of the conventional non-excitation brake in the axial direction.

[0009] The problem to be solved by the present disclosure is to provide a motor with a non-excitation operating brake that can be made compact in the axial direction by arranging a large-diameter friction plate. [Means for solving the problem]

[0010] A non-excitation actuated brake-equipped motor according to one embodiment of the present disclosure includes an inner rotor motor unit, a brake unit configured to hold the motor unit stationary, and a housing that radially covers the motor unit and the brake unit. The motor unit includes a stator, a rotor disposed radially inside the stator, and a rotating shaft that rotates integrally with the rotor. The brake unit includes a friction plate that rotates integrally with the rotating shaft, an armature, a braking spring that biases the armature toward the friction plate, an electromagnet that attracts the armature away from the friction plate when energized, and a side plate that holds the friction plate and the rotating shaft stationary by sandwiching the friction plate between the armature and the side plate. The side plate is fixed to the stator of the motor unit.

[0011] A motor with a non-excitation brake according to another aspect of the present disclosure includes an inner rotor motor unit, a brake unit configured to hold the motor unit stationary, and a housing that covers the motor unit and the brake unit radially outward. The motor unit includes a stator, a rotor disposed radially inside the stator, and a rotating shaft that rotates integrally with the rotor. The brake unit includes a friction plate that rotates integrally with the rotating shaft, an armature, a braking spring that biases the armature toward the friction plate, an electromagnet that attracts the armature away from the friction plate when energized, and a side plate that holds the friction plate and the rotating shaft stationary by sandwiching the friction plate between the armature and the side plate. The side plate is fixed to the housing. [Effects of the Invention]

[0012] The present disclosure has the effect of providing a motor with a non-excitation operating brake that can be made smaller in size in the axial direction by arranging a large-diameter friction plate. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a cross-sectional view that schematically shows a motor with a non-excitation operation brake according to a first embodiment. [Figure 2] FIG. 2 is a cross-sectional view that schematically shows a motor with a non-excitation operation brake according to the second embodiment. [Figure 3] FIG. 3 is a cross-sectional view schematically showing a motor with a non-excitation operation brake according to the third embodiment. [Figure 4] FIG. 4 is a cross-sectional view that schematically shows a motor with a non-excitation operation brake according to the fourth embodiment. [Figure 5] FIG. 5 is a cross-sectional view schematically showing a motor with a non-excitation operation brake according to the fifth embodiment. [Figure 6] FIG. 6 is a cross-sectional view that schematically shows a motor with a non-excitation operation brake according to the sixth embodiment. [Figure 7]FIG. 7 is a cross-sectional view that schematically shows a motor with a non-excitation operation brake according to the seventh embodiment. [Figure 8] FIG. 8 is a cross-sectional view that schematically shows a motor with a non-excitation operation brake according to the eighth embodiment. [Figure 9] FIG. 9 is a cross-sectional view that schematically shows a motor with a non-excitation operating brake of a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0014] 1. First embodiment (Outline of motor with non-excitation brake) FIG. 1 shows a schematic cross section of a non-excitation operated brake-equipped motor 1 according to a first embodiment.

[0015] The motor with a non-excitation operated brake 1 of the first embodiment includes a motor section 2, a brake section 3, and a housing section 4. The motor with a non-excitation operated brake 1 has an axis 1A.

[0016] In this disclosure, the direction in which the axis 1A extends is referred to as the axial direction. In the axial direction, the orientation in which the motor unit 2 is positioned relative to the brake unit 3 is referred to as the first orientation D1. In the axial direction, the orientation in which the brake unit 3 is positioned relative to the motor unit 2 (i.e., the orientation opposite to the first orientation) is referred to as the second orientation D2.

[0017] The motor unit 2 is configured to generate a rotational force when power is supplied to the motor unit 2. The brake unit 3 is configured to hold the rotation of the motor unit 2 stationary when power is not supplied to the brake unit 3.

[0018] (Motor section) The following describes the detailed structure of the motor section 2. The motor section 2 is an inner rotor type motor.

[0019] The motor section 2 includes an annular stator 21, a rotor 23 disposed inside the stator 21 in the radial direction of the motor section 2, and a rotating shaft 25 connected to the rotor 23 so as to rotate integrally with the rotor 23.

[0020] The stator 21 includes an annular stator core 212, a plurality of coil wires 214 wound around the stator core 212, and a substrate 216 that forms the end of the stator 21 in the second direction D2.

[0021] The axis of the cylindrical stator core 212 coincides with the axis 1A of the motor 1 with a non-excitation operated brake. The stator core 212 is formed by stacking a plurality of steel plates 218 in the thickness direction. Each steel plate 218 is made of a magnetic material. Each steel plate 218 is, for example, a silicon steel plate. The substrate 216 is an annular member located in the second direction D2 relative to the stator core 212 and the coil wire 214.

[0022] The rotor 23 rotates around the axis of the rotating shaft 25 relative to the stator 21. That is, magnetic flux generated from the multiple coil wires 214 wound around the stator core 212 generates an electromagnetic force that rotates the rotor 23 around the axis of the rotating shaft 25. The axis of the cylindrical rotating shaft 25 coincides with the axis 1A of the motor 1 with a non-excitation operated brake.

[0023] The rotor 23 is disposed inside the stator core 212. The rotor 23 includes a rotor core 232 and a plurality of permanent magnets 234.

[0024] The rotor core 232 is formed by stacking a plurality of steel plates 238 in the thickness direction. Each steel plate 238 is made of a magnetic material. Each steel plate 238 is, for example, a silicon steel plate.

[0025] Rotor core 232 is formed in a cylindrical shape concentric with stator core 212. The axis of rotor core 232 coincides with the axis of rotating shaft 25. In the axial direction, the positions of both ends of rotor core 232 are substantially aligned with the positions of both ends of stator core 212.

[0026] Rotor core 232 is provided with a plurality of magnet accommodating portions 233. The plurality of magnet accommodating portions 233 accommodate a plurality of permanent magnets 234. Each of the plurality of magnet accommodating portions 233 is a through hole that passes through rotor core 232 in the axial direction.

[0027] Each of the plurality of permanent magnets 234 is held in the magnet accommodating portion 233 by being inserted into the magnet accommodating portion 233 with, for example, an adhesive attached thereto.

[0028] The plurality of magnet accommodating portions 233 are provided at equal intervals in the circumferential direction of the rotor core 232. As a result, the plurality of permanent magnets 234 are arranged at equal intervals in the circumferential direction of the rotor core 232.

[0029] Rotating shaft 25 is held inside cylindrical rotor core 232. Rotating shaft 25 is connected to rotor core 232 so as to rotate integrally with rotor core 232 about axis 1A.

[0030] (Brake section) The following describes the detailed structure of the brake unit 3. The brake unit 3 is configured to hold the rotation of the motor unit 2 stationary when not energized.

[0031] The brake unit 3 includes a friction plate 31, an armature 32, a braking spring 33, an electromagnet 34, a side plate 35, and a hub 36. As shown in Fig. 1, the friction plate 31 and the armature 32 are located between the electromagnet 34 and the side plate 35 in the axial direction.

[0032] The friction plate 31 is a brake disc having an annular shape, and is connected to the rotary shaft 25 of the motor unit 2 so as to rotate integrally therewith.

[0033] The armature 32 is an annular plate-shaped member made of a magnetic material. The orientation of the armature 32 relative to the friction plate 31 is the second orientation D2. The armature 32 is movable in parallel to the axial direction, but movement in other directions is restricted.

[0034] The braking spring 33 is a coil spring. The braking spring 33 is disposed on the electromagnet 34 so as to constantly urge the armature 32 toward the friction plate 31. The orientation of the braking spring 33 relative to the armature 32 is the second orientation D2. The braking spring 33 is configured to constantly urge the armature 32 in the first orientation D1.

[0035] The electromagnet 34 is configured to attract the armature 32 in a direction away from the friction plate 31 when energized. The orientation of the electromagnet 34 relative to the armature 32 is the second orientation D2. The electromagnet 34 is configured to attract the armature 32 in the second orientation D2 when in an excited state.

[0036] The electromagnet 34 includes a core 5 containing a magnetic material and an excitation coil 6 wound around the core 5. The core 5 has a coil accommodating portion 56 configured to accommodate the excitation coil 6 and a spring accommodating portion 53 configured to accommodate the braking spring 33. The spring accommodating portion 53 is a blind hole that opens in the first direction D1. The braking spring 33 is accommodated in the spring accommodating portion 53 in a compressed state. A first end of the braking spring 33 is in pressure contact with the bottom surface of the spring accommodating portion 53, and a second end of the braking spring 33 is in pressure contact with the surface of the armature 32 facing the second direction D2.

[0037] In the radial direction of the core 5, the spring accommodating portion 53 is located radially outward of the coil accommodating portion 56. Therefore, the braking spring 33 is located radially outward of the exciting coil 6. In the radial direction of the motor 1 with a non-excitation operating brake, the exciting coil 6 is located between the braking spring 33 and the rotating shaft 25. The radial direction here is a direction perpendicular to the axial direction.

[0038] The side plate 35 is an annular plate-shaped member fixed to the substrate 216 that constitutes the end of the stator 21. The side plate 35 is fixed to the surface of the substrate 216 facing the second direction D2 using, for example, an adhesive or screws.

[0039] The side plate 35 fixed to the stator 21 is located outside the rotor 23 in the radial direction of the motor unit 2. The side plate 35 is located outside the area where the rotor 23 is located in the axial direction. In other words, the side plate 35 is located outside the area where the rotor 23 is located in the second direction D2 in the axial direction. The side plate 35 is located within the area where the stator 21 is located in the radial direction of the motor unit 2.

[0040] The side plate 35 is a metal member. The metal used for the side plate 35 is, for example, iron or stainless steel. In this disclosure, iron is used to include iron alloys. Examples of iron alloys include silicon steel, permalloy, and ferrite. The surface of the side plate 35 is preferably plated. The plating is, for example, zinc plating.

[0041] The side plate 35 is provided so as to hold the friction plate 31 in a stationary state by sandwiching the friction plate 31 between itself and the armature 32, and thus to hold the rotary shaft 25 of the motor section 2 in a stationary state.

[0042] The hub 36 is an annular member fixed to the rotating shaft 25 of the motor unit 2 so as to rotate integrally with the rotating shaft 25. The friction plate 31 has splines that mate with the hub 36. The friction plate 31 is connected to the hub 36 so as to rotate integrally with the hub 36, and is capable of translation in the axial direction relative to the hub 36. In the motor 1 with a non-excitation operated brake of the first embodiment, the friction plate 31 has a portion that mates with the hub 36, and therefore a reinforcing plate 315 is provided on the friction plate 31 to prevent damage to this mates portion. The reinforcing plate 315 is preferably embedded inside the friction plate 31.

[0043] (Housing) The housing 4 is a cylindrical structure that forms the outer shell of the non-excitation operated brake-equipped motor 1. The housing 4 includes a portion 42 that covers the radial outside of the motor unit 2 and a portion 43 that covers the radial outside of the brake unit 3. Hereinafter, the portion 42 of the housing 4 will be referred to as the housing 42. The portion 43 of the housing 4 will be referred to as the housing 43.

[0044] In the motor 1 with a non-excitation operating brake of the first embodiment, the housing 42 that covers the motor unit 2 and the housing 43 that covers the brake unit 3 are configured as separate bodies. The orientation in which the housing 42 is positioned relative to the housing 43 is a first orientation D1.

[0045] In the motor 1 with a non-excitation operated brake of the first embodiment, the housing 4 (i.e., housings 42, 43) is formed into a cylindrical shape using a non-magnetic material. The non-magnetic material here is, for example, aluminum, but the housing 4 can also be formed using other non-magnetic materials such as stainless steel. That is, in the motor 1 with a non-excitation operated brake of the first embodiment, the housing 43 that covers the brake unit 3 is formed using a non-magnetic material such as aluminum, and the housing 42 that covers the motor unit 2 is formed using a non-magnetic material such as aluminum. In this disclosure, aluminum is used to include aluminum alloys.

[0046] (Action and effect) In the motor 1 with a non-excitation operating brake of the first embodiment, in the brake section 3 when not energized, the braking spring 33 applies a biasing force in a first direction D1 to the armature 32, pressing the armature 32 against the friction plate 31. Therefore, in the brake section 3 when not energized, the friction plate 31 is sandwiched between the armature 32 and the side plate 35, and the rotating shaft 25 of the motor section 2 is held stationary.

[0047] The brake portion 3 in a non-energized state is the brake portion 3 in which the electromagnet 34 is in a non-energized state, in other words, the brake portion 3 in a non-excited state.

[0048] In the motor 1 with a non-excitation actuation brake of the first embodiment, in the brake section 3 when power is applied, the magnetic attractive force generated by the electromagnet 34 causes the armature 32 to move in the second direction D2 against the biasing force of the braking spring 33, and move away from the friction plate 31. Therefore, in the brake section 3 when power is applied, the friction plate 31 is not sandwiched between the armature 32 and the side plate 35, and the braking of the rotating shaft 25 of the motor section 2 is released.

[0049] The brake portion 3 when energized is the brake portion 3 in which the electromagnet 34 is in an energized state, in other words, the brake portion 3 in an excited state.

[0050] In the motor 1 with a non-excitation operated brake of the first embodiment described above, the side plate 35 is not fixed to the core 5 of the electromagnet 34 using a screw, but is fixed to the end of the stator 21 of the motor section 2. Therefore, in the motor 1 with a non-excitation operated brake of the first embodiment, it is not necessary to position the friction plate 31 to avoid the fixing screw, and it is possible to install a friction plate 31 with a large diameter.

[0051] The outer diameter of the annular friction plate 31 matches the outer diameter of the annular armature 32. Therefore, in the non-excitation operated brake-equipped motor 1 of the first embodiment, a large friction force is generated between the armature 32 and the friction plate 31.

[0052] According to the motor 1 with a non-excitation operated brake of the first embodiment, even if the biasing force that the brake spring 33 applies to the armature 32 is relatively small, a sufficient frictional force can be generated between the armature 32 and the friction plate 31, so it is possible to use a small coil spring with a small number of turns as the brake spring 33. Furthermore, as the brake spring 33 becomes smaller, it is also possible to use a coil with a small number of turns as the excitation coil 6. By reducing the size of the brake spring 33 and the excitation coil 6, it is possible to make the core 5 more compact in the axial direction, and ultimately to make the entire motor 1 with a non-excitation operated brake more compact in the axial direction.

[0053] It is not essential that the outer diameters of the friction plate 31 and the armature 32 are the same. For example, the outer diameter of the friction plate 31 can be larger than the outer diameter of the armature 32, or the outer diameter of the friction plate 31 can be smaller than the outer diameter of the armature 32.

[0054] (Comparative Example) A comparative example of a non-excitation operated brake-equipped motor 1 is shown schematically in Fig. 9. In the description of the comparative example, the same components as those in the first embodiment are given the same reference numerals and detailed description thereof will be omitted.

[0055] In the comparative example of the motor with a non-excitation operated brake 1, the side plate 9 is fixed to the core 5 of the electromagnet 34 using a screw 900. Therefore, in the comparative example of the motor with a non-excitation operated brake 1, it is necessary to position the friction plate 31 so as to avoid the fixing screw 900, and the outer diameter of the friction plate 31 is set to be significantly smaller than the outer diameter of the armature 32.

[0056] As is clear from the comparison with the above comparative example, in the motor 1 with a non-excitation operated brake of the first embodiment, it is not necessary to position the friction plate 31 in a way that avoids the fixing screws, so it is possible to install a friction plate 31 with a large diameter.

[0057] 2. Second embodiment A non-excitation operated brake-equipped motor 1 according to the second embodiment will be described with reference to Fig. 2. In the following description, the same components as those in the first embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0058] In the motor 1 with a non-excitation operated brake of the second embodiment, the configuration of the motor 1 with a non-excitation operated brake of the first embodiment is based, and further, a core 5 of the electromagnet 34 is fixed to the housing portion 4. The core 5 of the electromagnet 34 is fixed to a housing 43 of the housing portion 4 that covers the radial outside of the brake portion 3. The core 5 is press-fitted and fixed to the inner peripheral surface of the housing 43.

[0059] In the motor 1 with a non-excitation operation brake of the second embodiment, no screw is required to fix the core 5 of the electromagnet 34, and the structure is made compact.

[0060] Furthermore, in the motor 1 with a non-excitation operated brake of the second embodiment, the outer peripheral surface of the core 5 and the inner peripheral surface of the housing 43 are in close contact with each other, eliminating dead space between the core 5 and the housing 43. Furthermore, in the motor 1 with a non-excitation operated brake of the second embodiment, the radial dimension of the core 5 can be set large and the axial dimension of the core 5 can be set short, making it possible to make the core 5 compact in the axial direction, and ultimately making the entire motor 1 with a non-excitation operated brake compact in the axial direction.

[0061] 3. Third embodiment A non-excitation operated brake-equipped motor 1 according to the third embodiment will be described with reference to Fig. 3. In the following description, the same components as those in the second embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0062] The motor 1 with a non-excitation operated brake of the third embodiment is based on the configuration of the motor 1 with a non-excitation operated brake of the second embodiment, and further has a spring accommodating portion 53 of the core 5 that is provided to accommodate the brake spring 33 and is located radially inside the coil accommodating portion 56. The brake spring 33 accommodated in the core 5 is located radially inside the excitation coil 6. In the radial direction of the motor 1 with a non-excitation operated brake, the brake spring 33 is located between the excitation coil 6 and the rotating shaft 25.

[0063] Additionally, in the motor 1 with a non-excitation operated brake according to the third embodiment, the housing 43 of the brake unit 3 includes a magnetic material. The magnetic material here is, for example, iron. That is, the housing 43 of the brake unit 3 is formed of a magnetic material. The housing 43 is preferably made of iron.

[0064] The core 5 and excitation coil 6 of the electromagnet 34 are located radially inside the housing 43 made of a magnetic material. The core 5 and excitation coil 6 are located axially within the range of the housing 43. In other words, the core 5 and excitation coil 6 are located in a position that does not extend beyond the range of the housing 43 in the axial direction.

[0065] In the non-excitation operated brake-equipped motor 1 of the third embodiment, the housing 42 that covers the motor section 2 is made of a non-magnetic material such as aluminum.

[0066] In the motor 1 with a non-excitation operated brake of the third embodiment, a magnetic circuit is formed by combining the core 5, which includes a magnetic body, with the housing 43, which also includes a magnetic body. In other words, the housing 43, which is located radially outward of the core 5, functions as part of the magnetic circuit, making it possible to further reduce the size of the core 5. By making the core 5 more compact in the axial direction, the entire motor 1 with a non-excitation operated brake can be made more compact in the axial direction.

[0067] In the motor 1 with a non-excitation operated brake of the third embodiment, the magnetic material constituting the housing 43 and the magnetic material constituting the core 5 are both iron, but this is not limited to this. The material of the magnetic material constituting the housing 43 and the material of the magnetic material constituting the core 5 may be the same as or different from each other.

[0068] In the third embodiment of the motor 1 with a non-excitation operating brake, the inner surface of the housing 43 is in close contact with the outer surface of the core 5, but the entire outer surface of the core 5 may be in close contact with the housing 43, or only a portion of the outer surface of the core 5 may be in close contact with the housing 43.

[0069] 4. Fourth embodiment A motor 1 with a non-excitation operation brake according to the fourth embodiment will be described with reference to Fig. 4. In the following description, the same components as those in the third embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0070] In the motor 1 with a non-excitation operated brake of the fourth embodiment, the core 5 and the housing 43 that covers the radially outer side of the brake unit 3 of the housing unit 4 are further configured as an integrated part 7 containing a magnetic material. In other words, whereas in the third embodiment the housing 43 and the core 5 are formed separately, in the fourth embodiment the housing 43 and the core 5 are formed as an integrated part.

[0071] In the non-excitation operated brake-equipped motor 1 of the fourth embodiment, the spring accommodating portion 53 of the core 5 provided to accommodate the braking spring 33 is located radially inside the coil accommodating portion 56, similar to the third embodiment.

[0072] Both a radially outer portion 71 of the integral body 7 that constitutes the housing 43 and a radially inner portion 72 of the integral body 7 that constitutes the core 5 contain a magnetic material. The integral body 7 is formed of a magnetic material. The integral body 7 is preferably made of iron, for example. The spring accommodating portion 53 and the coil accommodating portion 56 are formed in the portion 72 of the integral body 7 that constitutes the core 5.

[0073] According to the motor 1 with a non-excitation operated brake of the fourth embodiment, the magnetic circuit is formed by an integrated body 7 including the housing 43 and the core 5. Therefore, the dimension of the brake portion 3 in the axial direction can be shortened, and the overall structure of the motor 1 with a non-excitation operated brake can be made smaller.

[0074] 5. Fifth embodiment A motor 1 with a non-excitation operation brake according to the fifth embodiment will be described with reference to Fig. 5. In the following description, the same components as those in the first embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0075] The motor 1 with a non-excitation operating brake of the fifth embodiment includes a motor section 2, a brake section 3, and a housing section 4, similar to the first embodiment.

[0076] The motor unit 2 includes a stator 21, a rotor 23, and a rotating shaft 25 similar to those in the first embodiment. The brake unit 3 includes a friction plate 31, an armature 32, a braking spring 33, an electromagnet 34, a side plate 35, and a hub 36 similar to those in the first embodiment. The housing unit 4 includes a housing 42 and a housing 43 similar to those in the first embodiment.

[0077] On the other hand, in the motor 1 with a non-excitation operation brake of the fifth embodiment, the side plate 35 is fixed to the housing part 4, not to the stator 21 of the motor part 2.

[0078] Specifically, the annular metal side plate 35 is fixed by press fitting to the inner circumferential surface of the housing 43, which covers the radially outer side of the brake unit 3 in the housing unit 4. The method for fixing the side plate 35 is not limited to press fitting, and the side plate 35 may be fixed to the housing 43 by other methods, such as using an adhesive or screws.

[0079] Furthermore, the object to which the side plate 35 is fixed is not limited to the housing 43. The side plate 35 may be fixed by press-fitting to the housing 42, which is part of the housing unit 4 and covers the radially outer side of the motor unit 2. The method of fixing the side plate 35 to the housing 42 is not limited to press-fitting, and the side plate 35 may be fixed to the housing 42 by other methods, such as using an adhesive or screws.

[0080] In the motor 1 with a non-excitation operating brake of the fifth embodiment, it is also possible to install a friction plate 31 with a large diameter, since it is not necessary to position the friction plate 31 to avoid the fixing screw 900 as in the comparative example shown in Figure 9.

[0081] In the motor 1 with a non-excitation operated brake of the fifth embodiment, as in the first embodiment, a large friction force can be generated between the large-diameter friction plate 31 and the armature 32, and a small coil spring with a small number of turns can be used as the brake spring 33. Furthermore, as the brake spring 33 becomes smaller, a coil with a small number of turns can also be used as the excitation coil 6. By reducing the size of the brake spring 33 and the excitation coil 6, the core 5 can be made more compact in the axial direction, and ultimately the entire motor 1 with a non-excitation operated brake can be made more compact in the axial direction.

[0082] 6. Sixth embodiment A motor 1 with a non-excitation operation brake according to a sixth embodiment will be described with reference to Fig. 6. In the following description, the same components as those in the fifth embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0083] In the motor 1 with a non-excitation operated brake of the sixth embodiment, the configuration of the motor 1 with a non-excitation operated brake of the fifth embodiment is based, and further, the core 5 of the electromagnet 34 is fixed to the housing portion 4. The core 5 of the electromagnet 34 is fixed to a housing 43 of the housing portion 4 that covers the radial outside of the brake portion 3. The core 5 is press-fitted and fixed to the inner peripheral surface of the housing 43.

[0084] The housing 4 is further provided with a protrusion 45 that protrudes radially inward. The protrusion 45 is positioned in the first direction D1 further than the side plate 35 that is press-fitted and fixed to the housing 4. The protrusion 45 is provided so as to reinforce the side plate 35 by coming into contact with it.

[0085] In the sixth embodiment, the protrusion 45 is located between the side plate 35 and the stator 21 in the axial direction. A gap is provided between the protrusion 45 and the substrate 216 that constitutes the end of the stator 21. The protrusion 45 is formed integrally with the housing 4, but the protrusion 45 that is provided separately from the housing 4 may also be fixed to the housing 4 by, for example, press-fitting.

[0086] The protrusion 45 protrudes radially inward from the housing 42 that covers the motor unit 2 in the housing unit 4. The protrusion 45 is formed integrally with the housing 42, but the protrusion 45 provided separately from the housing 42 may also be fixed to the housing 42 by, for example, press-fitting.

[0087] The protrusion 45 may protrude radially inward from the housing 43 that covers the brake unit 3 in the housing unit 4. In this case, the protrusion 45 may be formed integrally with the housing 43, or the protrusion 45 may be provided separately from the housing 43 and fixed to the housing 43 by, for example, press-fitting.

[0088] In the motor 1 with a non-excitation operation brake of the sixth embodiment, no screw is required to fix the core 5 of the electromagnet 34, and the structure is made compact.

[0089] Furthermore, in the motor 1 with a non-excitation operated brake of the sixth embodiment, the outer peripheral surface of the core 5 and the inner peripheral surface of the housing 43 are in close contact with each other, eliminating dead space between the core 5 and the housing 43. Furthermore, in the motor 1 with a non-excitation operated brake of the sixth embodiment, the radial dimension of the core 5 can be set large and the axial dimension of the core 5 can be set short, making it possible to make the core 5 and, by extension, the entire motor 1 with a non-excitation operated brake compact in the axial direction.

[0090] 7. Seventh embodiment A motor 1 with a non-excitation operation brake according to the seventh embodiment will be described with reference to Fig. 7. In the following description, the same components as those in the sixth embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0091] The motor 1 with a non-excitation operated brake of the seventh embodiment is based on the configuration of the motor 1 with a non-excitation operated brake of the sixth embodiment, and further has the spring accommodating portion 53 of the core 5 positioned radially inside the coil accommodating portion 56. The brake spring 33 accommodated in the core 5 is positioned radially inside the excitation coil 6. In the radial direction of the motor 1 with a non-excitation operated brake, the brake spring 33 is positioned between the excitation coil 6 and the rotating shaft 25.

[0092] Additionally, in the motor 1 with a non-excitation operated brake according to the seventh embodiment, the housing 43 of the brake unit 3 includes a magnetic material. The magnetic material here is, for example, iron. That is, the housing 43 of the brake unit 3 is formed of a magnetic material. The housing 43 is preferably made of iron.

[0093] The core 5 and excitation coil 6 of the electromagnet 34 are located radially inside the housing 43 made of a magnetic material. The core 5 and excitation coil 6 are located axially within the range of the housing 43. In other words, the core 5 and excitation coil 6 are located in a position that does not extend beyond the range of the housing 43 in the axial direction.

[0094] In the motor 1 with a non-excitation operation brake of the seventh embodiment, the housing 42 that covers the motor section 2 is made of a non-magnetic material such as aluminum.

[0095] In the motor 1 with a non-excitation operated brake of the seventh embodiment, a magnetic circuit is formed by combining the core 5, which includes a magnetic body, with the housing 43, which also includes a magnetic body. In other words, the housing 43, which is located radially outward of the core 5, functions as part of the magnetic circuit, making it possible to further reduce the size of the core 5. By making the core 5 more compact in the axial direction, the entire motor 1 with a non-excitation operated brake can be made more compact in the axial direction.

[0096] In the motor 1 with a non-excitation operated brake of the seventh embodiment, the magnetic material constituting the housing 43 and the magnetic material constituting the core 5 are both iron, but this is not limited to this. The material of the magnetic material constituting the housing 43 and the material of the magnetic material constituting the core 5 may be the same as or different from each other.

[0097] In the seventh embodiment of the motor 1 with a non-excitation operating brake, the inner surface of the housing 43 is in close contact with the outer surface of the core 5, but the entire outer surface of the core 5 may be in close contact with the housing 43, or only a portion of the outer surface of the core 5 may be in close contact with the housing 43.

[0098] 8. Eighth embodiment A non-excitation operated brake-equipped motor 1 according to the eighth embodiment will be described with reference to Fig. 8. In the following description, the same components as those in the seventh embodiment will be given the same reference numerals and detailed description thereof will be omitted.

[0099] In the motor 1 with a non-excitation operated brake of the eighth embodiment, the core 5 and the housing 43 that covers the radially outer side of the brake unit 3 of the housing unit 4 are further configured as an integrated part 7 containing a magnetic material. In other words, whereas in the seventh embodiment the housing 43 and the core 5 are formed separately, in the eighth embodiment the housing 43 and the core 5 are formed as an integrated part.

[0100] In the non-excitation operated brake-equipped motor 1 of the eighth embodiment, the spring accommodating portion 53 of the core 5 provided to accommodate the braking spring 33 is located radially inside the coil accommodating portion 56, similar to the seventh embodiment.

[0101] Both a radially outer portion 71 of the integral body 7 that constitutes the housing 43 and a radially inner portion 72 of the integral body 7 that constitutes the core 5 contain a magnetic material. The integral body 7 is formed of a magnetic material. The integral body 7 is preferably made of iron, for example. The spring accommodating portion 53 and the coil accommodating portion 56 are formed in the portion 72 of the integral body 7 that constitutes the core 5.

[0102] According to the motor 1 with a non-excitation operated brake of the eighth embodiment, the magnetic circuit is formed by an integrated body 7 including the housing 43 and the core 5. Therefore, the dimension of the brake portion 3 in the axial direction can be shortened, and the overall structure of the motor 1 with a non-excitation operated brake can be made compact.

[0103] 9. Variations The above embodiment is merely one of various embodiments of the present disclosure. In the following description of the modified examples, the same components as those in the above embodiment will be denoted by the same reference numerals and detailed description thereof will be omitted.

[0104] In the first to eighth embodiments described above, the side plate 35 is made of metal, but the side plate 35 may be made of resin. Also, in the first to eighth embodiments, the surface of the side plate 35 is plated, but the side plate 35 does not have to be plated. In other words, the side plate 35 may be a plated resin plate material, or an unplated resin plate material. The side plate 35 may also be an unplated metal plate material.

[0105] In the first to eighth embodiments described above, the housings 42 and 43 are formed as separate bodies, but the housings 42 and 43 may be formed as a single body. In other words, the housing unit 4 may not be divided into the two housings 42 and 43.

[0106] In the second, third, sixth, and seventh embodiments, the core 5 of the electromagnet 34 is press-fitted and fixed to the housing 4 located radially outward of the core 5, but the means for fixing the core 5 is not limited to this. For example, the core 5 may be fixed to the housing 4 using an adhesive or a screw. Furthermore, the core 5 may be fixed to a housing (not shown) located alongside the core 5 in the axial direction using an adhesive or a screw.

[0107] In other configurations of the above-described embodiments, various modifications can be made depending on the design, etc., as long as the object of the present disclosure can be achieved.

[0108] 10. Summary As described based on the above embodiment and modified examples, the non-excitation operated brake-equipped motor (1) according to the first aspect of the present disclosure includes an inner rotor type motor section (2), a brake section (3) configured to hold the rotation of the motor section (2) stationary, and a housing section (4) that covers the radial outside of the motor section (2) and the brake section (3). The motor section (2) includes a stator (21), a rotor (23) disposed radially inside the stator (21), and a rotating shaft (25) that rotates integrally with the rotor (23). The brake unit (3) includes a friction plate (31) that rotates integrally with the rotating shaft (25), an armature (32), a braking spring (33) that urges the armature (32) toward the friction plate (31), an electromagnet (34) that attracts the armature (32) in a direction away from the friction plate (31) when energized, and a side plate (35) that holds the friction plate (31) and the rotating shaft (25) stationary by sandwiching the friction plate (31) between the electromagnet (34) and the armature (32). The side plate (35) is fixed to the stator (21) of the motor unit (2).

[0109] According to this embodiment, the side plate 35 is fixed to the stator 21, rather than being screwed to the core 5 as in the conventional technology. Therefore, the friction plate 31 does not interfere with the fixing screw, and a large-diameter friction plate 31 can be disposed. Therefore, according to this embodiment, the brake spring 33 can be made smaller, and the electromagnet 34 can also be made smaller. As a result, the overall size can be made more compact in the axial direction.

[0110] A non-excitation actuated brake-equipped motor (1) according to a second aspect of the present disclosure includes an inner rotor type motor section (2), a brake section (3) configured to hold the rotation of the motor section (2) stationary, and a housing section (4) that covers the radial outside of the motor section (2) and the brake section (3). The motor section (2) includes a stator (21), a rotor (23) disposed radially inside the stator (21), and a rotating shaft (25) that rotates integrally with the rotor (23). The brake unit (3) includes a friction plate (31) that rotates integrally with the rotating shaft (25), an armature (32), a braking spring (33) that urges the armature (32) toward the friction plate (31), an electromagnet (34) that attracts the armature (32) in a direction away from the friction plate (31) when energized, and a side plate (35) that holds the friction plate (31) and the rotating shaft (25) stationary by sandwiching the friction plate (31) between the electromagnet (34) and the armature (32). The side plate (35) is fixed to the housing unit (4).

[0111] According to this embodiment, the side plate 35 is fixed to the housing 4, rather than being screwed to the core 5 as in the conventional technology. Therefore, the friction plate 31 does not interfere with the fixing screw, and a large-diameter friction plate 31 can be disposed. Therefore, according to this embodiment, the braking spring 33 can be made smaller, and the electromagnet 34 can also be made smaller. As a result, the overall size can be made more compact in the axial direction.

[0112] In a motor (1) with a non-excitation operated brake according to a third aspect of the present disclosure, in the first or second aspect, the electromagnet (34) includes a core (5) having a coil accommodating portion (56) and an exciting coil (6) accommodated in the coil accommodating portion (56). The core (5) is fixed to the housing portion (4).

[0113] According to this embodiment, the core 5 of the electromagnet 34 is fixed to the housing 4, thereby eliminating the dead space between the core 5 and the housing 4. Furthermore, the radial dimension of the core 5 can be set large and the axial dimension of the core 5 can be set short, so that the entire non-excitation operated brake-equipped motor 1 can be made compact in the axial direction.

[0114] In the non-excitation operated brake-equipped motor (1) according to a fourth aspect of the present disclosure, in the third aspect, the portion (43) of the housing portion (4) that covers the radial outside of the brake portion (3) includes a magnetic material.

[0115] According to this embodiment, the core 5 and the magnetic body-containing portion 43 of the housing 4 are combined to form a magnetic circuit. That is, the portion 43 of the housing 4 located radially outward of the core 5 functions as part of the magnetic circuit. This allows the core 5 to be further miniaturized.

[0116] In a non-excitation operated brake-equipped motor (1) according to a fifth aspect of the present disclosure, in the fourth aspect, the core (5) further includes a spring accommodating portion (53) that accommodates the braking spring (33). The spring accommodating portion (53) is located radially inward of the coil accommodating portion (56).

[0117] According to this embodiment, the portion (43) of the housing (4) located radially outward of the core (5) can be made to function effectively as part of the magnetic circuit.

[0118] In a motor (1) with a non-excitation operated brake according to a sixth aspect of the present disclosure, in the first or second aspect, the electromagnet (34) includes a core (5) having a coil accommodating portion (56) and an exciting coil (6) accommodated in the coil accommodating portion (56). The core (5) and a portion (43) of the housing portion (4) that covers the radially outer side of the brake portion (3) are configured as a single body (7) containing a magnetic material.

[0119] According to this embodiment, the magnetic circuit is formed by an integral part 7 including the core 5 and the magnetic body-containing portion 43 of the housing 4. This allows the brake unit 3 to be made compact, and ultimately allows the entire non-excitation operated brake-equipped motor 1 to be made compact.

[0120] In a non-excitation operated brake-equipped motor (1) according to a seventh aspect of the present disclosure, in the sixth aspect, the core (5) further includes a spring accommodating portion (53) that accommodates the braking spring (33). The spring accommodating portion (53) is located radially inward of the coil accommodating portion (56).

[0121] According to this embodiment, the radially outer portion (71) of the integral part (7) that constitutes the portion (43) of the housing portion (4) can be made to function effectively as a part of the magnetic circuit. [Explanation of symbols]

[0122] 1. Motor with non-excitation brake 2 Motor section 21 Stator 23 Rotor 25 Rotation axis 3 Brake section 31 Friction plate 32 Armature 33 Brake spring 34 Electromagnet 35 Side Plate 4 Housing 43 parts 5 cores 53 Spring housing 56 Coil storage section 6 Excitation coil 7 One piece

Claims

1. an inner rotor type motor unit; a brake unit configured to hold the rotation of the motor unit stationary; a housing portion that covers the motor portion and the brake portion radially outward, The motor unit includes: a stator; a rotor disposed radially inside the stator; a rotating shaft that rotates integrally with the rotor, The brake unit is a friction plate that rotates integrally with the rotary shaft; Armature and a braking spring that biases the armature toward the friction plate; an electromagnet that attracts the armature in a direction away from the friction plate when energized; a side plate provided to hold the friction plate and the rotating shaft in a stationary state by sandwiching the friction plate between the side plate and the armature, The side plate is fixed to the stator of the motor unit. Motor with non-excitation brake.

2. an inner rotor type motor unit; a brake unit configured to hold the rotation of the motor unit stationary; a housing portion that covers the motor portion and the brake portion radially outward, The motor unit includes: a stator; a rotor disposed radially inside the stator; a rotating shaft that rotates integrally with the rotor, The brake unit is a friction plate that rotates integrally with the rotary shaft; Armature and a braking spring that biases the armature toward the friction plate; an electromagnet that attracts the armature in a direction away from the friction plate when energized; a side plate provided to hold the friction plate and the rotating shaft in a stationary state by sandwiching the friction plate between the side plate and the armature, The side plate is fixed to the housing. Motor with non-excitation brake.

3. the electromagnet includes a core having a coil accommodating portion and an excitation coil accommodated in the coil accommodating portion, The core is fixed to the housing.

3. A motor with a non-excitation brake according to claim 1 or 2.

4. A portion of the housing that covers the radially outer side of the brake unit includes a magnetic material.

4. The motor with a non-excitation brake according to claim 3.

5. The core further includes a spring accommodating portion that accommodates the damping spring, The spring accommodating portion is located radially inside the coil accommodating portion.

5. The motor with a non-excitation brake according to claim 4.

6. the electromagnet includes a core having a coil accommodating portion and an excitation coil accommodated in the coil accommodating portion, The core and a portion of the housing that covers the radially outer side of the brake portion are configured as an integrated body containing a magnetic material.

3. A motor with a non-excitation brake according to claim 1 or 2.

7. The core further includes a spring accommodating portion that accommodates the damping spring, The spring accommodating portion is located radially inside the coil accommodating portion.

7. The motor with a non-excitation brake according to claim 6.

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