Motor device

Abstract

The invention provides a motor device, and relates to the technical field of motors, the motor device comprises a motor shaft, a rotary transformer mounting shaft and a rotary transformer mechanism; the motor shaft is provided with a hollow cavity, the rotary transformer mounting shaft extends into the hollow cavity, and the rotary transformer mounting shaft is in interference fit with the hollow cavity; and the rotary transformer mechanism is arranged on the outer side of the rotary transformer mounting shaft in a sleeving manner, and the rotary transformer mechanism is arranged in the hollow cavity. The motor shaft is internally provided with the hollow cavity, the rotary transformer mounting shaft is arranged in the hollow cavity, and the rotary transformer mechanism is mounted in the hollow cavity, so that the rotary transformer mechanism is arranged in the motor shaft, the axial size of the motor device can be shortened, and the motor device is suitable for scenes with extreme requirements on mounting space; such as hub motors, flat servo motors and high-performance unmanned aerial vehicle motors.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and in particular to an electric motor device. Background Technology

[0002] Currently, there are three installation methods for the resolver mechanism of the motor unit: end cover installation, shaft extension installation, and modular installation.

[0003] All three installation methods involve mounting the resolver mechanism outside the motor shaft. This installation method increases the axial dimension of the motor and makes the motor heavier. Summary of the Invention

[0004] The purpose of this invention is to provide a motor device to solve the technical problem that the resolver mechanism in the prior art increases the axial dimension of the motor and makes the motor heavier.

[0005] The motor device provided by the present invention includes a motor shaft, a resolver mounting shaft, and a resolver mechanism; The motor shaft has a hollow cavity, the resolver mounting shaft extends into the hollow cavity, and the resolver mounting shaft is interference-fitted with the hollow cavity; The resolver mechanism is sleeved on the outside of the resolver mounting shaft and is disposed within the hollow cavity.

[0006] Furthermore, the resolver mechanism includes a resolver rotor; The resolver rotor is sleeved on the resolver mounting shaft and is located inside the hollow cavity.

[0007] Furthermore, the resolver mounting shaft is provided with a first shoulder, and the end of the resolver mounting shaft is threadedly connected to a first locking nut. The resolver rotor is disposed between the first shoulder and the first locking nut, and the first shoulder and the first locking nut can cooperate to clamp the resolver rotor.

[0008] Furthermore, the resolver rotor is interference-fitted with the resolver mounting shaft.

[0009] Furthermore, the resolver mechanism also includes a resolver stator; The resolver stator is sleeved on the outside of the resolver rotor, and the resolver stator is located in the hollow cavity.

[0010] Furthermore, the resolver mechanism also includes a resolver stator mounting base; The resolver stator mounting base extends into the hollow cavity, the resolver stator mounting base is provided with a first protrusion, and the end of the resolver stator mounting base extending into the hollow cavity is connected to the resolver stator pressure plate. The resolver stator is located between the first protrusion and the resolver stator pressure plate, and the first protrusion and the resolver stator pressure plate can cooperate to clamp the resolver stator.

[0011] Furthermore, the resolver stator mounting base is detachably connected to the resolver stator pressure plate.

[0012] Furthermore, the motor assembly also includes a bearing, which is sleeved on the outside of the motor shaft.

[0013] Furthermore, the motor shaft is provided with a second shoulder; The motor device also includes a rotor, which is sleeved on the outside of the motor shaft; The bearing includes an inner ring; along the axial direction of the motor shaft, the second shoulder, the rotor, and the inner ring are arranged sequentially; the end of the motor shaft near the inner ring is threadedly connected to a second locking nut, and the second shoulder and the second locking nut can cooperate to clamp the rotor and the inner ring. A locking washer is provided between the second locking nut and the inner ring of the bearing.

[0014] Furthermore, the motor device also includes a bearing housing, the bearing housing having a second protrusion, and the end of the bearing housing being connected to a bearing pressure plate; The bearing includes an outer ring, which is located between the second protrusion and the bearing pressure plate. The second protrusion and the bearing pressure plate can cooperate to clamp the outer ring.

[0015] The present invention provides a motor device comprising a motor shaft, a resolver mounting shaft, and a resolver mechanism. The motor shaft has a hollow cavity, and the resolver mounting shaft extends into the hollow cavity, with an interference fit between the resolver mounting shaft and the hollow cavity. The resolver mechanism is sleeved on the outside of the resolver mounting shaft and is disposed within the hollow cavity. The hollow cavity within the motor shaft, the resolver mounting shaft within the hollow cavity, and the resolver mechanism installed within the hollow cavity, allow the resolver mechanism to be internally integrated into the motor shaft, thereby shortening the axial dimension of the motor device. This makes it suitable for scenarios with extreme space requirements, such as hub motors, flat servo motors, and high-performance drone motors. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the motor device provided in an embodiment of the present invention; Figure 2 This is a cross-sectional view of the motor device provided in an embodiment of the present invention.

[0018] Icons: 1-Motor shaft; 2-Resolver mounting shaft; 3-Resolver rotor; 4-Resolver stator; 5-First locking nut; 6-Resolver stator mounting base; 7-Resolver stator pressure plate; 8-Bolt; 9-Bearing; 10-Bearing housing; 11-Second locking nut; 12-Stabilizing washer; 13-Bearing pressure plate; 14-Rotor; 15-Resolver line channel. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] This invention provides a motor device, and several embodiments are given below to describe the motor device provided by this invention in detail.

[0021] The motor device provided in this embodiment, such as Figures 1 to 2 As shown, it includes a motor shaft 1, a resolver mounting shaft 2, and a resolver mechanism; the motor shaft 1 has a hollow cavity, the resolver mounting shaft 2 extends into the hollow cavity, and the resolver mounting shaft 2 is interference-fitted with the hollow cavity; the resolver mechanism is sleeved on the outside of the resolver mounting shaft 2, and the resolver mechanism is located in the hollow cavity.

[0022] The resolver mounting shaft 2 extends into the hollow cavity. The resolver mounting shaft 2, the hollow cavity, and the motor shaft 1 are coaxially arranged, and the resolver mounting shaft 2 is interference-fitted with the hollow cavity.

[0023] A hollow cavity is opened inside the motor shaft 1, and the resolver mounting shaft 2 is set in the hollow cavity. The resolver mechanism is installed in the hollow cavity, so that the resolver mechanism is built into the motor shaft 1. This can shorten the axial dimension of the motor device, making it suitable for scenarios with extreme requirements for installation space, such as hub motors, flat servo motors, high-performance drone motors, and high-performance manned motors.

[0024] Furthermore, the resolver mechanism is built into the motor shaft 1, which protects the resolver mechanism from external contaminants such as dust, oil, and cutting fluid, while also providing excellent electromagnetic shielding.

[0025] The motor shaft 1 is designed as a hollow structure, which can reduce the overall weight of the motor device. Furthermore, the resolver mechanism is built into the motor shaft 1, making the overall structure of the motor device more compact.

[0026] The motor shaft 1 features a hollow design. During machining, machining allowances are reserved at the mating points with bearing 9 and rotor 14. The mating point with resolver mounting shaft 2 is finished to the final dimensions, and the mating point between resolver mounting shaft 2 and motor shaft 1 is also finished to the final dimensions. The remaining dimensions are rough-machined. The fit between motor shaft 1 and resolver mounting shaft 2 is an interference fit, ensuring the bonding force between the two surfaces and preventing relative displacement during motor operation. The motor shaft 1 and resolver mounting shaft 2 are finished after assembly. This not only ensures the coaxiality of motor shaft 1 and resolver mounting shaft 2 but also allows for machining of the internal cavity of motor shaft 1 on resolver mounting shaft 2, achieving weight reduction.

[0027] Furthermore, the resolver mechanism includes a resolver rotor 3; the resolver rotor 3 is mounted on the resolver mounting shaft 2 and is located within the hollow cavity.

[0028] The resolver rotor 3 is fixedly mounted on the resolver mounting shaft 2. The mating surfaces of the resolver rotor 3 and the resolver mounting shaft 2 are interference fits to ensure the coaxiality of the resolver rotor 3 and the resolver mounting shaft 2 and to prevent relative displacement during rotation.

[0029] Furthermore, the resolver mounting shaft 2 is provided with a first shoulder, and the end of the resolver mounting shaft 2 is threadedly connected to the first locking nut 5. The resolver rotor 3 is disposed between the first shoulder and the first locking nut 5, and the first shoulder and the first locking nut 5 can cooperate to clamp the resolver rotor 3.

[0030] The end of the resolver mounting shaft 2 is provided with a threaded structure, which is threadedly connected to the first locking nut 5.

[0031] The resolver rotor 3 is positioned between the first shoulder and the first locking nut 5. When the first locking nut 5 is locked to the resolver mounting shaft 2, the first shoulder and the first locking nut 5 can cooperate to clamp the resolver rotor 3, thereby positioning the resolver rotor 3 along its axial direction.

[0032] Furthermore, the resolver rotor 3 is interference-fitted with the resolver mounting shaft 2.

[0033] The mating surfaces of the resolver rotor 3 and the resolver mounting shaft 2 are interference fits to ensure the coaxiality of the resolver rotor 3 and the resolver mounting shaft 2 and to prevent relative displacement during rotation.

[0034] Furthermore, the resolver mechanism also includes a resolver stator 4; the resolver stator 4 is sleeved on the outside of the resolver rotor 3 and is located in the hollow cavity.

[0035] The resolver stator 4 is mounted on the outside of the resolver rotor 3. The resolver stator 4 is housed in the hollow cavity and is fixed in place.

[0036] When the motor shaft 1 rotates, it drives the resolver mounting shaft 2 to rotate around its own axis. When the resolver mounting shaft 2 rotates, it drives the resolver rotor 3 to rotate around the axis of the resolver mounting shaft 2.

[0037] Furthermore, the resolver mechanism also includes a resolver stator mounting base 6; the resolver stator mounting base 6 extends into the hollow cavity, the resolver stator mounting base 6 is provided with a first protrusion, and the end of the resolver stator mounting base 6 extending into the hollow cavity is connected to the resolver stator pressure plate 7; the resolver stator 4 is located between the first protrusion and the resolver stator pressure plate 7, and the first protrusion and the resolver stator pressure plate 7 can cooperate to clamp the resolver stator 4.

[0038] The resolver stator mounting base 6 is integrated with the housing of the motor unit. The position of the resolver stator mounting base 6 is fixed. The resolver stator mounting base 6 extends into the hollow cavity. The resolver stator 4 is sleeved on the outside of the resolver rotor 3 and is located between the first protrusion and the resolver stator pressure plate 7. After the resolver stator pressure plate 7 is connected to the resolver stator mounting base 6, the first protrusion and the resolver stator pressure plate 7 cooperate to clamp the resolver stator 4 and position the resolver stator 4 along its axial direction.

[0039] There is a gap between the resolver stator mounting base 6 and the resolver stator, which forms the resolver wire channel 15 for the wire harness of the resolver mechanism to pass through.

[0040] Furthermore, the resolver stator mounting base 6 is detachably connected to the resolver stator pressure plate 7.

[0041] The detachable connection method can be a snap-fit ​​or a threaded connection, which facilitates the assembly and disassembly of the resolver stator pressure plate 7.

[0042] In this embodiment, the resolver stator mounting base 6 and the resolver stator pressure plate 7 are connected by bolts 8.

[0043] Furthermore, the motor assembly also includes a bearing 9, which is mounted on the outside of the motor shaft 1.

[0044] The bearing 9 is sleeved on the outside of the motor shaft 1, and the motor shaft 1 can be installed in the housing of the motor device through the bearing 9.

[0045] Furthermore, the motor shaft 1 is provided with a second shoulder; the motor device also includes a rotor 14, which is sleeved on the outside of the motor shaft 1; the bearing 9 includes an inner ring; along the axial direction of the motor shaft 1, the second shoulder, the rotor 14 and the inner ring of the bearing 9 are arranged in sequence; the end of the motor shaft 1 near the inner ring of the bearing 9 is threadedly connected to a second locking nut 11, and the second shoulder and the second locking nut 11 can cooperate to clamp the rotor 14 and the inner ring of the bearing 9; a stop washer 12 is provided between the second locking nut 11 and the inner ring of the bearing 9.

[0046] The rotor 14 is positioned along its circumference by the interference fit between the rotor 14 and the motor shaft 1 and by a key. The coaxiality of the rotor 14 and the motor shaft 1 is ensured by the interference fit.

[0047] The bearing 9 and the motor shaft 1 are fitted with an interference fit, which ensures the coaxiality of the bearing 9 and the motor shaft 1 and that there is no relative displacement during rotation.

[0048] When the second locking nut 11 is threaded to the end of the motor shaft 1 near the inner ring of the bearing 9, the second locking nut 11 and the second shoulder can cooperate to clamp the rotor 14 and the inner ring of the bearing 9 to position the rotor 14 and the inner ring of the bearing 9 along the axial direction of the motor shaft 1.

[0049] Furthermore, the motor device also includes a bearing housing 10, which has a second protrusion. The end of the bearing housing 10 is connected to the bearing pressure plate 13. The bearing 9 includes an outer ring, which is located between the second protrusion and the bearing pressure plate 13. The second protrusion and the bearing pressure plate 13 can cooperate to clamp the outer ring of the bearing 9.

[0050] The bearing housing 10 is integrated with the housing of the motor unit, and the position of the bearing housing 10 is fixed.

[0051] After the bearing pressure plate 13 is connected to the end of the bearing housing 10, the second protrusion and the bearing pressure plate 13 can cooperate to clamp the outer ring of the bearing 9, thereby positioning the outer ring of the bearing 9 along its axial direction.

[0052] The bearing pressure plate 13 and the bearing housing 10 can be connected in a detachable manner to facilitate the assembly and disassembly of the bearing pressure plate 13.

[0053] In this embodiment, the bearing pressure plate 13 and the bearing housing 10 are connected by bolts 8.

[0054] In the motor device provided in this embodiment, both the resolver stator 4 and the resolver rotor 3 are housed within the hollow cavity of the motor shaft 1, which shortens the axial length of the motor device and reduces its overall weight. The motor shaft 1 protects the resolver mechanism from the intrusion of external contaminants such as dust, oil, and cutting fluid, while also providing excellent electromagnetic shielding.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric machine arrangement, characterized in that The motor shaft, the resolver mounting shaft and the resolver mechanism are included. The motor shaft is provided with a hollow cavity, the resolver mounting shaft extends into the hollow cavity, and the resolver mounting shaft is in interference fit with the hollow cavity. The resolver mechanism is sleeved outside the resolver mounting shaft, and the resolver mechanism is arranged in the hollow cavity.

2. The electric machine device of claim 1, wherein, The resolver mechanism includes a resolver rotor. The resolver rotor is sleeved on the resolver mounting shaft, and the resolver rotor is located in the hollow cavity.

3. The electric machine device of claim 2, wherein, The resolver mounting shaft is provided with a first shaft shoulder, an end of the resolver mounting shaft is in threaded connection with a first locking nut, the resolver rotor is arranged between the first shaft shoulder and the first locking nut, and the first shaft shoulder and the first locking nut can clamp the resolver rotor in cooperation.

4. The electric machine device of claim 2, wherein, The resolver rotor is in interference fit with the resolver mounting shaft.

5. The electric machine device of claim 2, wherein, The resolver mechanism further includes a resolver stator. The resolver stator is sleeved outside the resolver rotor, and the resolver stator is located in the hollow cavity.

6. The electric machine device of claim 5, wherein, The resolver mechanism further includes a resolver stator mounting seat. The resolver stator mounting seat extends into the hollow cavity, the resolver stator mounting seat is provided with a first protrusion, and an end of the resolver stator mounting seat extending into the hollow cavity is connected with a resolver stator pressing plate. The resolver stator is located between the first protrusion and the resolver stator pressing plate, and the first protrusion and the resolver stator pressing plate can clamp the resolver stator in cooperation.

7. The electric machine device of claim 6, wherein, The resolver stator mounting seat and the resolver stator pressing plate are detachably connected.

8. The electric machine device of claim 1, wherein, The motor device further includes a bearing, and the bearing is sleeved outside the motor shaft.

9. The electric machine device of claim 8, wherein, The motor shaft is provided with a second shaft shoulder. The motor device further includes a rotor, and the rotor is sleeved outside the motor shaft. The bearing includes a bearing inner ring; in the axial direction of the motor shaft, the second shaft shoulder, the rotor and the bearing inner ring are arranged in sequence; an end of the motor shaft close to the bearing inner ring is in threaded connection with a second locking nut, and the second shaft shoulder and the second locking nut can clamp the rotor and the bearing inner ring in cooperation. A stop washer is arranged between the second locking nut and the bearing inner ring.

10. The electric machine device of claim 8, wherein, The motor device further includes a bearing seat, the bearing seat is provided with a second protrusion, and an end of the bearing seat is connected with a bearing pressing plate. The bearing includes a bearing outer ring, the bearing outer ring is located between the second protrusion and the bearing pressing plate, and the second protrusion and the bearing pressing plate can clamp the bearing outer ring in cooperation.

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