High-precision motor with electromagnetic response quick brake device

Abstract

The application relates to a high-precision motor with a quick braking device with an electromagnetic response, which comprises a motor body and a braking mechanism; the motor body comprises a stator, a rotor, an input shaft and a casing, the casing is provided with a containing cavity, the middle part of the input shaft is located in the containing cavity, the two ends of the input shaft respectively extend out of the containing cavity to form a braking part and an output part, the rotor is installed on the middle part of the input shaft, and the stator is installed on the inner side wall of the casing; the braking mechanism comprises a braking disc, a first braking piece, an elastic piece and a guide assembly; the braking disc is installed on the braking part of the input shaft and rotates synchronously with the input shaft, the guide assembly is installed on one side of the casing facing the braking disc, the first braking piece is slidingly installed on the guide assembly, the first braking piece is located between the casing and the braking disc, and the elastic piece is arranged between the first braking piece and the casing; the braking mechanism of the application does not need to be equipped with an additional power source, the response speed is extremely fast, the safety is high, and the application is suitable for the mechanical field which needs emergency braking and precision braking.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular discloses a high-precision motor with an electromagnetic response fast braking device. Background Technology

[0002] In fields such as high-precision automated equipment, robots, and CNC machine tools, drive motors are not only a power source, but also need to have fast and reliable braking capabilities to achieve precise position holding during operation and rapid braking in case of emergencies.

[0003] Currently, the common braking solution involves installing a separate brake external to the motor. This split structure has the following drawbacks: First, it increases the axial dimension and overall volume of the system, making it unsuitable for miniaturized and compact designs. Second, the split structure often results in improper assembly during installation, leading to misalignment of the brake disc or motor shaft, abnormal wear, prolonged braking time, and affecting braking smoothness and accuracy. Finally, its braking response requires transmission through an external drive chain, which introduces a certain delay, making it difficult to meet the needs of applications requiring extremely high response speeds.

[0004] To address the aforementioned issues, a motor with a built-in braking mechanism has been developed. However, existing built-in braking structures still have room for improvement. For example, the guiding method of the brake pads is not precise enough, causing the brake pads to deviate or jam during engagement and disengagement, affecting braking reliability; the braking torque of a single brake pad is limited; and the wear condition of the brake pads is difficult to monitor in real time, making maintenance inconvenient. Therefore, there is an urgent need for a high-precision motor with a compact structure, rapid braking response, and ease of maintenance. Summary of the Invention

[0005] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this invention is to provide a high-precision motor with an electromagnetic response fast braking device.

[0006] To achieve the above objectives, the present invention provides a high-precision motor with an electromagnetic response fast braking device, comprising a motor body and a braking mechanism; the motor body includes a stator, a rotor, an input shaft, and a housing, the housing having a receiving cavity, the middle portion of the input shaft being located within the receiving cavity, and both ends of the input shaft extending out of the receiving cavity to form a braking part and an output part, respectively; the rotor is mounted on the middle portion of the input shaft, and the stator is mounted on the inner side wall of the housing; the braking mechanism includes a brake disc, a first brake pad, an elastic element, and a guide assembly; the brake disc is mounted on the braking part of the input shaft and rotates synchronously with the input shaft, and the guide assembly is mounted on the housing facing the brake disc. On one side, the first brake pad is slidably mounted on the guide assembly. The first brake pad is located between the housing and the brake disc, and the elastic element is disposed between the first brake pad and the housing. When the motor is powered on, the magnetic field generated by the stator causes the rotor to drive the input shaft to rotate. The brake disc rotates with the input shaft. The first brake pad is attracted by the magnetic field and moves away from the brake disc along the guide assembly. The first brake pad separates from the brake disc, and the elastic element generates an elastic restoring force under the action of the first brake pad. When the motor is powered off, the magnetic field disappears, and the first brake pad approaches and presses against the brake disc under the action of the elastic restoring force of the elastic element, so that the brake disc and the input shaft stop rotating.

[0007] Furthermore, the first brake pad has a first armature plate and a first friction plate. The first armature plate has a first mounting hole. The first brake pad is slidably mounted on the guide assembly through the first mounting hole. The first friction plate is detachably mounted on the side of the first armature plate facing the brake disc. The elastic element is located between the first armature plate and the housing.

[0008] Furthermore, the braking mechanism also has a second brake pad, which is fixedly mounted on the guide assembly, and the brake disc is located between the first brake pad and the second brake pad; when the motor is powered on, there is a gap between the second brake pad and the brake disc, and when the motor is powered off, the first brake pad and the second brake pad press against both sides of the brake disc respectively.

[0009] Furthermore, the second brake pad has a second armature and a second friction pad. The second armature has a second mounting hole. The second brake pad is fixedly mounted on the guide assembly via the second mounting hole. The second friction pad is detachably mounted on the side of the second armature facing the brake disc. The brake disc is located between the first friction pad and the second friction pad.

[0010] Furthermore, the brake disc has a body portion and a protruding neck portion, the protruding neck portion being close to the housing; the brake disc has a third mounting hole, the third mounting hole being recessed axially from the surface of the protruding neck portion and penetrating the brake disc; the brake disc is mounted on the input shaft via the third mounting hole; the first brake pad is movably sleeved on the protruding neck portion.

[0011] Furthermore, the number of guide components is three, and the three guide components are arranged in a ring around the central axis of the protruding neck.

[0012] Furthermore, the guide assembly has a fixed rod and a guide rod. The housing has a fourth mounting hole on the side facing the brake disc that cooperates with the fixed rod. One end of the fixed rod is fixed to the housing through the fourth mounting hole, and the other end of the fixed rod extends toward the brake disc. The guide rod is sleeved on the fixed rod, and the first brake pad is slidably mounted on the guide rod.

[0013] Furthermore, the end of the fixing rod away from the housing has a convex ring, and there is a limiting groove between the convex ring and the guide rod. The second brake pad is engaged in the limiting groove through the second mounting hole.

[0014] Furthermore, the braking mechanism also has a sensing device, the second brake pad has a fifth mounting hole, the sensing device is mounted in the fifth mounting hole, the sensing head of the sensing device extends out of the fifth mounting hole and toward the first brake pad; the sensing device is used to detect the distance between the first brake pad and the second brake pad.

[0015] Furthermore, the housing has a blind hole recessed on the side facing the first brake pad. One end of the elastic element extends into the blind hole and cooperates with the housing, while the other end of the elastic element protrudes out of the blind hole and acts on the first brake pad.

[0016] The beneficial effects of this invention are:

[0017] (1) Rapid response and reliable braking: The device adopts a power-on release and power-off braking working mode. When the motor is powered on, the electromagnetic force generated by the stator attracts and drives the first brake pad away from the brake disc, releasing the brake disc and allowing the motor shaft to run smoothly. When the motor is powered off, no external control signal is required. The elastic restoring force of the elastic element acts on the first brake pad, stopping the motor. The braking mechanism of this invention uses the electromagnetic force generated by the stator to attract the first brake pad to release the brake disc, while also storing the elastic restoring force. When the motor is powered off, the electromagnetic attraction disappears, and the elastic restoring force acts on the first brake pad to achieve braking. No additional power source is required, the response speed is extremely fast, and the safety is high. It is especially suitable for emergency braking and safety protection occasions.

[0018] (3) Precise guidance and smooth operation: By setting a protruding neck on the brake disc and setting multiple guide components on the housing, it is ensured that the first brake pad can move smoothly and steadily along the input shaft axis, effectively preventing the first brake pad from deflecting or jamming during the movement. This not only improves the reliability of the braking action, but also ensures that the braking surface of the first brake pad is evenly attached to the brake disc, reducing abnormal wear and improving braking accuracy and the life of the first friction pad.

[0019] (4) Dual-sided braking, powerful braking: By setting a fixed second brake pad on the side of the brake disc away from the first brake pad, it cooperates with the movable first brake pad to form a dual-friction surface for braking. This symmetrical structure can generate greater braking force and better braking effect.

[0020] (5) Modular design for easy maintenance: The brake pads have a split design of armature and friction pad. The armature is attracted by electromagnetic force to move the friction pad. The friction pad is used to directly contact the brake disc for braking. The friction pad is detachably installed on the armature. When the friction pad is worn to the point of needing replacement, only the friction pad needs to be replaced, which reduces the later maintenance and usage costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a high-precision motor with an electromagnetic response fast braking device according to the present invention;

[0022] Figure 2 This is a partial structural diagram of the present invention;

[0023] Figure 3 This is a partial structural diagram of the present invention;

[0024] Figure 4 This is a schematic diagram of the braking mechanism of the present invention;

[0025] Figure 5 This is an exploded structural diagram of the braking mechanism of the present invention;

[0026] Figure 6 This is a partial structural diagram of the present invention.

[0027] The reference numerals in the accompanying drawings include: 11, stator; 12, rotor; 13, input shaft; 131, brake unit; 14, housing; 141, fourth mounting hole; 142, blind hole; 2, brake disc; 21, main body; 22, protruding neck; 23, third mounting hole; 3, first brake pad; 31, first armature plate; 311, first mounting hole; 32, first friction plate; 4, guide assembly; 41, fixing rod; 411, protruding ring; 42, guide rod; 5, second brake pad; 51, second armature plate; 52, second friction plate; 6, sensing device; 61, sensing head. Detailed Implementation

[0028] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0029] Please see Figures 1 to 6As shown, a high-precision motor with an electromagnetic response fast braking device according to the present invention includes a motor body and a braking mechanism. The motor body includes a stator 11, a rotor 12, an input shaft 13, and a housing 14. The housing 14 has a receiving cavity. The middle part of the input shaft 13 is located in the receiving cavity, and the two ends of the input shaft 13 extend out of the receiving cavity to form a braking part 131 and an output part, respectively. The rotor 12 is installed in the middle part of the input shaft 13, and the stator 11 is installed on the inner side wall of the housing 14. The braking mechanism includes a brake disc 2, a first brake pad 3, an elastic element, and a guide assembly 4. The brake disc 2 is installed in the braking part 131 of the input shaft 13 and rotates synchronously with the input shaft 13. The guide assembly 4 is installed in the housing 14 facing the braking part. On one side of the moving disc 2, the first brake pad 3 is slidably mounted on the guide assembly 4. The first brake pad 3 is located between the housing 14 and the brake disc 2, and the elastic element is disposed between the first brake pad 3 and the housing 14. When the motor is powered on, the magnetic field generated by the stator 11 causes the rotor 12 to drive the input shaft 13 to rotate. The brake disc 2 rotates with the input shaft 13. The first brake pad 3 is attracted by the magnetic field and moves away from the brake disc 2 along the guide assembly 4. The first brake pad 3 separates from the brake disc 2, and the elastic element generates an elastic restoring force under the action of the first brake pad 3. When the motor is powered off, the magnetic field disappears, and the first brake pad 3 approaches and presses against the brake disc 2 under the action of the elastic restoring force of the elastic element, so that the brake disc 2 and the input shaft 13 stop rotating.

[0030] In actual use, the housing 14 has a cover, a front cover, and a rear cover. The front cover and the rear cover are fitted together at both ends of the cover to form a receiving cavity. The two ends of the input shaft 13 are respectively mounted on the front cover and the rear cover via a first bearing and a second bearing, and the input shaft 13 protrudes from the front cover to form a braking part 131. The braking part 131 of the input shaft 13 has a splined shaft, and the brake disc 2 is mounted on the braking part 131 via a splined wheel. The braking part 131 also has a retaining ring and a washer, and the splined wheel is located between the retaining ring and the washer to limit the position of the brake disc 2. One end of the guide assembly 4 is mounted on the front cover, and the other end extends toward the brake disc 2. When the motor is de-energized, the elastic element is in a compressed state, causing the first brake pad 3 to press against the brake disc 2. When the motor is energized, the first brake pad 3 is affected by the magnetic attraction generated by the stator 11 and moves away from the brake disc 2, separating the first brake pad 3 from the brake disc 2, and the motor operates normally.

[0031] Specifically, the first brake pad 3 has a first armature 31 and a first friction pad 32. The first armature 31 has a first mounting hole 311. The first brake pad 3 is slidably mounted on the guide assembly 4 through the first mounting hole 311. The first friction pad 32 is detachably mounted on the side of the first armature 31 facing the brake disc 2. The elastic element is located between the first armature 31 and the housing 14.

[0032] In actual use, the first armature plate 31 is disc-shaped, the first mounting hole 311 passes through the first armature plate 31 along the axial direction of the first armature plate 31, the first brake plate 3 is slidably mounted on the guide assembly 4 through the first mounting hole 311, the first friction plate 32 is annular, the first friction plate 32 has multiple countersunk screw holes, and the first friction plate 32 is detachably mounted on the first armature plate 31 by screws.

[0033] Specifically, the braking mechanism also has a second brake pad 5, which is fixedly mounted on the guide assembly 4, and the brake disc 2 is located between the first brake pad 3 and the second brake pad 5. When the motor is powered on, there is a gap between the second brake pad 5 and the brake disc 2. When the motor is powered off, the first brake pad 3 and the second brake pad 5 press against both sides of the brake disc 2 respectively.

[0034] Specifically, the second brake pad 5 has a second armature 51 and a second friction pad 52. The second armature 51 has a second mounting hole. The second brake pad 5 is fixedly mounted on the guide assembly 4 through the second mounting hole. The second friction pad 52 is detachably mounted on the side of the second armature 51 facing the brake disc 2. The brake disc 2 is located between the first friction pad 32 and the second friction pad 52.

[0035] In actual use, the second armature plate 51 is disc-shaped, and the second mounting hole penetrates the second armature plate 51 along its axial direction. The second brake pad 5 is fixedly mounted on the guide assembly 4 through the second mounting hole. The second friction pad 52 is annular and has multiple countersunk screw holes. The second friction pad 52 is detachably mounted on the second armature plate 51 by screws. The first mounting hole 311 communicates with the second mounting hole, and the diameter of the first mounting hole 311 is larger than that of the second mounting hole, allowing the first brake pad 3 to slide along the guide assembly 4, while the second brake pad 5 is engaged and fixed on the guide assembly 4. The inner edge of the second armature plate 51 is close to the inner edge of the second friction pad 52. The first friction pad 32 and the second friction pad 52 are equal in size and opposite in position to ensure braking balance.

[0036] In this embodiment, the outer peripheral edges of the first friction plate 32 and the second friction plate 52 coincide with the outer peripheral edge of the brake disc 2. The guide component 4 passes through the second armature plate 51, the first armature plate 31 and the upper end cover in sequence. The first friction plate 32 and the second friction plate 52 are respectively installed on the inner rings of the first armature plate 31 and the second armature plate 51. The outer rings of the first armature plate 31 and the second armature plate 51 have a first mounting hole 311 and a second mounting hole, respectively. That is, the guide component 4 passes through the outer rings of the first armature plate 31 and the second armature plate 51 in sequence. The guide component 4 does not contact the brake disc 2.

[0037] Specifically, the brake disc 2 has a body portion 21 and a protruding neck portion 22 protruding from the body portion 21, the protruding neck portion 22 being close to the housing 14; the brake disc 2 has a third mounting hole 23, the third mounting hole 23 being recessed axially from the surface of the protruding neck portion 22 and penetrating the brake disc 2; the brake disc 2 is mounted on the input shaft 13 via the third mounting hole 23; the first brake pad 3 is movably sleeved on the protruding neck portion 22.

[0038] In actual use, the body portion 21 of the brake disc 2 is disc-shaped, the protruding neck 22 is located in the middle of the brake disc 2, and the third mounting hole 23 is located in the middle of the protruding neck 22. In this embodiment, the first brake pad 3 also has a sixth mounting hole, and the first brake pad 3 is sleeved on the protruding neck 22 of the brake disc 2 through the sixth mounting hole, and is attached to or separated from the body portion 21 of the brake disc 2; the second brake pad 5 also has a seventh mounting hole, and when the second brake pad 5 is installed on the guide assembly 4, the input shaft 13 extends out through the seventh mounting hole.

[0039] Specifically, there are three guide components 4, which are arranged in a ring around the central axis of the convex neck 22.

[0040] Specifically, the guide assembly 4 has a fixed rod 41 and a guide rod 42. The housing 14 is provided with a fourth mounting hole 141 that cooperates with the fixed rod 41 on the side facing the brake disc 2. One end of the fixed rod 41 is fixed to the housing 14 via the fourth mounting hole 141, and the other end of the fixed rod 41 extends toward the brake disc 2. The guide rod 42 is sleeved on the fixed rod 41, and the first brake pad 3 is slidably mounted on the guide rod 42.

[0041] Specifically, the end of the fixing rod 41 away from the housing 14 has a protruding ring 411, and there is a limiting groove between the protruding ring 411 and the guide rod 42. The second brake pad 5 is clamped in the limiting groove through the second mounting hole.

[0042] In actual use, the three guide components 4 surround the outside of the brake disc 2, that is, the outer periphery of the first armature plate 31 is slidably connected to the guide rods 42 of the three guide components 4, and the middle part of the first armature plate 31 is slidably connected to the protruding neck 22, ensuring the smooth movement of the first armature plate 31. In this embodiment, the fixing rod 41 has external threads, the fourth mounting hole 141 has internal threads, the inner wall of the guide rod 42 has internal threads, the guide rod 42 is mounted on the fixing rod 41, one end of the guide rod 42 faces the upper end cover, and the other end of the guide rod 42 faces the second armature plate 51.

[0043] Specifically, the braking mechanism also has a sensing device 6, the second brake pad 5 has a fifth mounting hole, the sensing device 6 is mounted in the fifth mounting hole, and the sensing head 61 of the sensing device 6 extends out of the fifth mounting hole and toward the first brake pad 3; the sensing device 6 is used to detect the distance between the first brake pad 3 and the second brake pad 5.

[0044] In actual use, when the motor is powered off, the sensing device 6 detects the distance between the first brake pad 3 and the second brake pad 5. When the first friction pad 32 and the second friction pad 52 are worn, the distance between the first brake pad 3 and the second brake pad 5 decreases accordingly. When the value detected by the sensing device 6 approaches the safe value, the motor issues an alarm through the control component, requiring the friction pads to be replaced in time to prevent the brake disc 2 from directly contacting the armature plate when the friction pads are too thin.

[0045] Specifically, the housing 14 is recessed with a blind hole 142 on the side facing the first brake pad 3. One end of the elastic element extends into the blind hole 142 and cooperates with the housing 14, while the other end of the elastic element protrudes out of the blind hole 142 and acts on the first brake pad 3.

[0046] In actual use, there are six blind holes 142, which are evenly distributed on the upper end cover. There are two blind holes 142 between every two adjacent fourth mounting holes 141. A limiting post protrudes from the bottom of the blind hole 142, and the elastic element is sleeved on the limiting post.

[0047] In this embodiment, the motor also has a fan cover, which is fixed to the upper end cover and covers the braking mechanism. The fan cover has heat dissipation holes.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-precision motor with an electromagnetic response rapid braking device, characterized in that: The motor body includes a motor body and a braking mechanism. The motor body includes a stator (11), a rotor (12), an input shaft (13), and a housing (14). The housing (14) has a receiving cavity. The middle part of the input shaft (13) is located in the receiving cavity. The two ends of the input shaft (13) extend out of the receiving cavity to form a braking part (131) and an output part, respectively. The rotor (12) is installed in the middle part of the input shaft (13), and the stator (11) is installed on the inner wall of the housing (14). The braking mechanism includes a brake disc (2), a first brake pad (3), an elastic element, and a guide assembly (4). The brake disc (2) is installed in the braking part (131) of the input shaft (13) and rotates synchronously with the input shaft (13). The guide assembly (4) is installed on the side of the housing (14) facing the brake disc (2). The first brake pad... (3) Slidingly mounted on the guide assembly (4), the first brake pad (3) is located between the housing (14) and the brake disc (2), and the elastic element is set between the first brake pad (3) and the housing (14); When the motor is powered on, the magnetic field generated by the stator (11) causes the rotor (12) to drive the input shaft (13) to rotate, the brake disc (2) rotates with the input shaft, the first brake pad (3) is attracted by the magnetic field and moves away from the brake disc (2) along the guide assembly (4), the first brake pad (3) separates from the brake disc (2), and the elastic element generates an elastic restoring force under the action of the first brake pad (3); When the motor is powered off, the magnetic field disappears, and the first brake pad (3) approaches and presses against the brake disc (2) under the action of the elastic restoring force of the elastic element, so that the brake disc (2) and the input shaft (13) stop rotating; The braking mechanism also has a second brake pad (5), which is fixedly installed on the guide assembly (4). The brake disc (2) is located between the first brake pad (3) and the second brake pad (5). When the motor is powered on, there is a gap between the second brake pad (5) and the brake disc (2). When the motor is powered off, the first brake pad (3) and the second brake pad (5) press against both sides of the brake disc (2) respectively. The braking mechanism also has a sensing device (6), the second brake pad (5) has a fifth mounting hole, the sensing device (6) is mounted in the fifth mounting hole, the sensing head (61) of the sensing device (6) extends out of the fifth mounting hole and extends toward the first brake pad (3); the sensing device (6) is used to detect the distance between the first brake pad (3) and the second brake pad (5).

2. A high-precision motor with an electromagnetic response rapid braking device according to claim 1, characterized in that: The first brake pad (3) has a first armature plate (31) and a first friction plate (32). The first armature plate (31) has a first mounting hole (311). The first brake pad (3) is slidably mounted on the guide assembly (4) through the first mounting hole (311). The first friction plate (32) is detachably mounted on the side of the first armature plate (31) facing the brake disc (2). The elastic element is located between the first armature plate (31) and the housing (14).

3. A high-precision motor with an electromagnetic response rapid braking device according to claim 1, characterized in that: The second brake pad (5) has a second armature plate (51) and a second friction plate (52). The second armature plate (51) has a second mounting hole. The second brake pad (5) is fixedly mounted on the guide assembly (4) through the second mounting hole. The second friction plate (52) is detachably mounted on the side of the second armature plate (51) facing the brake disc (2). The brake disc (2) is located between the first friction plate (32) and the second friction plate (52).

4. A high-precision motor with an electromagnetic response rapid braking device according to claim 1, characterized in that: The brake disc (2) has a body portion (21) and a protruding neck portion (22) protruding from the body portion (21), the protruding neck portion (22) being close to the housing (14); the brake disc (2) has a third mounting hole (23), the third mounting hole (23) being recessed axially from the surface of the protruding neck portion (22) and penetrating the brake disc (2); the brake disc (2) is mounted on the input shaft (13) via the third mounting hole (23); the first brake pad (3) is movably sleeved on the protruding neck portion (22).

5. A high-precision motor with an electromagnetic response rapid braking device according to claim 4, characterized in that: The number of guide components (4) is three, and the three guide components (4) are arranged in a ring array around the central axis of the protruding neck (22).

6. A high-precision motor with an electromagnetic response rapid braking device according to claim 1, characterized in that: The guide assembly (4) has a fixed rod (41) and a guide rod (42). The housing (14) is provided with a fourth mounting hole (141) that cooperates with the fixed rod (41) on the side facing the brake disc (2). One end of the fixed rod (41) is fixed to the housing (14) through the fourth mounting hole (141), and the other end of the fixed rod (41) extends toward the brake disc (2). The guide rod (42) is sleeved on the fixed rod (41), and the first brake pad (3) is slidably mounted on the guide rod (42).

7. A high-precision motor with an electromagnetic response rapid braking device according to claim 6, characterized in that: The fixed rod (41) has a protruding ring (411) at one end away from the housing (14), and there is a limiting groove between the protruding ring (411) and the guide rod (42). The second brake pad (5) is clamped in the limiting groove through the second mounting hole.

8. A high-precision motor with an electromagnetic response rapid braking device according to claim 1, characterized in that: The housing (14) has a blind hole (142) recessed on the side facing the first brake pad (3). One end of the elastic element extends into the blind hole (142) and works with the housing (14). The other end of the elastic element protrudes out of the blind hole (142) and acts on the first brake pad (3).

Images