CN116317335A - Servo motor with braking function - Google Patents

Abstract

The invention relates to the technical field of motors with friction brakes, and discloses a servo motor with a braking function, which comprises a motor case, a rotating shaft and a brake, wherein the brake comprises a first brake component and a second brake component, the first brake component is sleeved on the periphery of the rotating shaft, the first brake component comprises a first driving plate, the second brake component comprises a second driving plate, the first driving plate and the second driving plate are in transmission connection based on a gear set, and the rotation angular velocity of the first driving plate is different from that of the second driving plate. The invention sets the first braking component and the second braking component which are related and act in sequence to realize superposition braking on different speeds, and when the first braking component can not rapidly reduce the speed of the rotating shaft to zero, the second braking component can brake the rotating shaft, so that the aim of superposition braking is fulfilled. Furthermore, the invention can utilize the inertia of the rotating shaft to brake the rotating shaft when the servo motor is powered off, recover energy for use, and increase the energy utilization rate.

Description

A servo motor with braking function

technical field

The invention relates to the technical field of motors with friction brakes, in particular to a servo motor with a braking function.

Background technique

Servo motor, also known as executive motor, is used as an actuator in the servo system to convert the received electrical signal into angular displacement or angular velocity output on the motor shaft. On some servo motors that operate in position mode, a servo motor is often installed inside the servo motor. Brake, when the equipment stops, use the brake to hold the motor shaft in one position to prevent the load from moving, and it can also be used as an emergency brake.

CN113685459A discloses a motor shaft brake and a servo motor to solve the problem that the existing motor brake needs to be powered on all the time to maintain a separated state, which wastes energy and causes the high temperature of the motor encoder to affect the accuracy of the servo system. The invention relates to a motor shaft brake, comprising: a casing; a braking mechanism arranged in the casing, which includes two braking parts opposite to each other in the first direction of the casing, one end of each of the two braking parts is connected to the The shells are elastically connected, and their respective other ends are opposite to form a braking surface for braking and controlling the motor shaft; the electromagnetic holding mechanism is arranged in the shell, which includes two oppositely disposed in the second direction of the shell. electromagnetic holding parts, each of which is formed with two action arms. The invention sets that the servo motor can be braked only when it is in a charging state, and additional power is required to brake the servo motor when in use, which in a sense increases the energy consumption of the servo motor.

CN102704157A relates to an oil-cooled servo motor with a brake for a rapier loom, including an oil-cooled servo motor and a brake, and the oil-cooled servo motor is provided with a brake. The invention uses an oil-cooled servo motor with a brake to directly drive the loom, and an oil-cooled servo motor with a brake to directly drive the main motor to stop at the same time when stopping to reduce energy consumption; the clutch and slow transmission parts are omitted to make the structure simple and the transmission Chain reduction, easy maintenance and adjustment, high efficiency, convenient and fast speed change, and at the same time, the speed of the main engine can be adjusted by panel input to strengthen the man-machine dialogue function. The above-mentioned invention only uses a set of braking device to brake the servo motor, and does not take into account the problem that the braking device cannot quickly reduce the rotating shaft speed and cause braking failure when the rotating shaft rotates at a high speed.

Contents of the invention

In view of this, the object of the present invention is to provide a servo motor with a braking function, which is used to solve the problem of high energy consumption of the braking device of the existing servo motor and the braking failure when the rotating shaft rotates at a high speed.

The present invention solves the above technical problems by the following technical means:

A servo motor with a braking function, including a motor case and a rotating shaft, and a brake, the brake includes a first braking assembly and a second braking assembly, and the first braking assembly is sleeved around the rotating shaft On the side, the first brake assembly includes a first drive plate, the second brake assembly includes a second drive plate, the first drive plate and the second drive plate are connected based on a gear set, and the first The angular velocity of rotation of a drive plate is different from the angular velocity of rotation of the second drive plate. The invention sets the first brake assembly and the second brake assembly that are associated and act in sequence to achieve superimposed braking on different speeds. When the first brake assembly cannot quickly reduce the speed of the rotating shaft to zero, the second brake assembly will The rotating shaft is braked to achieve the purpose of superimposed braking.

Further, a drive gear is provided coaxially around the rotating shaft, and the brake further includes a first connection assembly, the first connection assembly includes a differential and a connecting rod, and the differential includes a first gear and a second gear. Two gears, the first gear meshes with the driving gear, and the second gear is coaxially connected with the connecting rod. In this application, the differential is set to transfer the energy of the rotating shaft to the brake in a controllable manner. When braking is not required, the energy transferred from the rotating shaft to the brake is internally absorbed through the differential; when braking is required, the energy transferred by the rotating shaft is passed through The differential is transmitted to the connecting rod and then drives the brake assembly for braking. The control method is simple and effective.

Further, the first connection assembly further includes a locker, the locker includes an electromagnet arranged inside the connecting rod and a friction brake assembly arranged around the connecting rod, the friction brake assembly It includes a limiting plate, a first spring and a connecting piece connected in sequence, and the limiting plate is in frictional connection with the connecting rod under the action of the electromagnet. In the present invention, when performing braking, the power supply of the locker can use the same power supply as that of the motor box, so that the locker is unlocked when the motor box is powered off, so that the inertia of the rotating shaft is used to drive the brake assembly to brake, so as to achieve energy conservation. recycling. The lock can also be controlled by a separate power supply, so that the lock can be unlocked when the motor box is powered on, and a part of the kinetic energy of the rotating shaft is used for braking. This scenario is generally used for emergency braking where the power supply of the motor box cannot be turned off immediately.

Further, a third gear is coaxially arranged on the peripheral side of the connecting rod, and the first drive plate meshes with the third gear, and the first brake assembly also includes a slider, on which a There is a sliding column, and a sliding rail runs through the driving plate along the direction parallel to the axis, and the sliding column is slidably connected with the sliding rail. The invention provides a slider capable of locking and braking the rotating shaft under the drive of the rotating shaft, fully utilizes the kinetic energy of the rotating shaft, and improves the utilization rate of energy.

Further, the first brake assembly further includes a base and a sleeve, the base is slidably connected to the slider, and a second spring is provided on the inner wall of the sleeve and connected to the peripheral side of the slider. The invention sets a spring group to control the braking process of the slider. When the speed of the rotating shaft drops to close to zero and is not enough to drive the slider to stay at the braking position, the slider is retracted into the slide rail under the tension of the spring, and the reset is completed, which is automatic. High degree.

Further, a limiting rib is provided on the connecting surface of the sliding block corresponding to the rotating shaft. In the present invention, a limiting rib is provided on the surface of the slider for bonding to the rotating shaft for braking, thereby increasing the friction between the sliding block and the rotating shaft, thereby increasing the deceleration effect of the slider, and facilitating the braking and deceleration of the rotating shaft.

Further, the first drive plate and the second drive plate are connected in transmission based on a second connection assembly, and the second connection assembly includes a fourth gear, a rod and a fifth gear connected in sequence, and the fourth gear is connected to The first drive plate meshes, and the fifth gear meshes with the second drive plate. In this application, the second connection assembly is set to transfer a part of the kinetic energy of the first brake assembly to the second brake assembly, so that the second brake assembly can superimpose the rotating shaft when the first brake assembly fails or the braking effect is poor. Braking further reduces the kinetic energy of the shaft.

Further, the inner diameter of the first drive plate is greater than or equal to the sum of the diameter of the rotating shaft and twice the diameter of the sliding column, so that when the sliding block is attached to the rotating shaft, the sliding column The sliding post can be tangent to the inner wall of the first drive plate. In this application, the inner diameter of the first driving plate is set in conjunction with the sliding column, so that when the sliding column moves to the position where the rotating shaft is attached, if the rotating shaft is still rotating, the first driving plate can continue to rotate and drive the second brake assembly for braking .

Further, a two-way drive is also provided on the connecting rod. In the present application, a bidirectional drive is provided so that the brake can drive the brake to perform braking when the rotating shaft rotates in the forward direction and in the opposite direction, which increases the practical effect of the brake.

Further, the servo motor also includes a casing, and the casing is arranged outside the brake. In this application, a housing is provided outside the brake to prevent external impurities or parts from falling into the brake and the motor box when the servo motor is in use, so that the servo motor can run stably and effectively. Further, the operational risk caused by exposed parts to operators is reduced.

Beneficial effects of the present invention:

1. The invention sets the first brake assembly and the second brake assembly that are associated and act in sequence to achieve superimposed braking on different speeds. When the first brake assembly cannot quickly reduce the speed of the shaft to zero, the shaft will continue to drive the second brake assembly. Only the second brake assembly will brake the rotating shaft, so as to achieve the purpose of superimposed braking.

2. In this application, the differential is set to transfer the energy of the rotating shaft to the brake in a controllable manner. When braking is not required, the energy transferred from the rotating shaft to the brake is internally absorbed through the differential; when braking is required, the energy transferred by the rotating shaft is The energy is transmitted to the connecting rod through the differential to drive the brake assembly for braking. The control method is simple and effective.

3. When performing braking in the present invention, the power supply of the locker can use the same power supply as that of the motor box, so that the locker is unlocked when the motor box is powered off, so that the inertia of the rotating shaft is used to drive the brake assembly to perform braking, so as to achieve Recycling of energy. The lock can also be controlled by a separate power supply, so that the lock can be unlocked when the motor box is powered on, and a part of the kinetic energy of the rotating shaft is used for braking. This scenario is generally used for emergency braking where the power supply of the motor box cannot be turned off immediately.

4. The application sets the second connection assembly to transmit a part of the kinetic energy of the first brake assembly to the second brake assembly, so that the second brake assembly can rotate the shaft when the brake of the first brake assembly fails or the braking effect is poor. Superimposed braking is performed to further reduce the kinetic energy of the rotating shaft.

Description of drawings

Fig. 1 is the structural representation of the embodiment of the servo motor with braking function of the present invention;

Fig. 2 is the schematic diagram of the brake of the embodiment of the servo motor with braking function of the present invention

Fig. 3 is the schematic diagram of the locker of the embodiment of the servomotor with braking function of the present invention;

Fig. 4 is the schematic diagram of the differential of the embodiment of the servomotor with braking function of the present invention;

Fig. 5 is a schematic diagram of assembling the first braking assembly of the embodiment of the servo motor with braking function of the present invention;

Fig. 6 is an exploded view of the first braking assembly of the embodiment of the servo motor with braking function of the present invention.

in,

100, motor box; 200, rotating shaft; 210, drive gear; 300, brake; 310, first brake assembly; 311, first drive plate; 312, slide rail; 313, slide block; 314, slide column; 315, Base; 316, sleeve; 317, first spring; 318, limiting rib; 319, connecting rod; 320, second brake assembly; 321, second drive plate; 330, first connecting assembly; 331, differential Device; 332, connecting rod; 333, first gear; 334, second gear; 335, locker; 336, limit plate; 337, second spring; 338, connector; 339, third gear; 340, installation seat; 350, the second connection assembly; 351, the fourth gear; 352, the fifth gear; 353, the rod; 360, the mounting seat; 400, the shell.

Implementation

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in FIGS. 1-6 , a servo motor with braking function of the present invention includes a motor box 100 , a rotating shaft 200 and a brake 300 . The motor box 100 serves as a driving device and a mounting device for the rotating shaft 200 , and can drive the rotating shaft 200 to rotate around the axis. The brake 300 can convert a part of the kinetic energy of the rotating shaft 200 into the energy required to limit the rotation of the rotating shaft 200 when the power supply of the motor box 100 is turned off. Compared with the traditional braking device, it requires additional electric energy to lock the rotating shaft 200. To achieve the purpose of restricting the rotation of the rotating shaft, the application saves the extra energy required for braking and improves the energy utilization rate.

The brake 300 includes a first brake assembly 310 and a second brake assembly 320 . The first braking assembly 310 and the second braking assembly 320 are connected through a gear set. The first braking assembly 310 includes a first driving plate 311 , and the second braking assembly 320 includes a second driving plate 321 . Both the first brake assembly 310 and the second brake assembly 320 are used to lock the rotating shaft 200 to achieve the purpose of braking. 200 locked position, but when the rotating shaft 200 is still rotating, the second brake assembly will continue to act to the locked position to brake the rotating shaft 200 . The first active braking assembly can be the first braking assembly 310 or the second braking assembly 320, and the angular velocity difference between the first driving plate 311 and the second driving plate 321 can be adjusted by adjusting the two acting. The action time of the two is set. When the action time of the first brake assembly 310 is set to be shorter than the action time of the second brake assembly 320, it is enough to adjust the angular velocity of the first drive plate 311 to be greater than the angular velocity of the second drive plate 321, and the adjustment method can be by changing The number of teeth on both or changing the gear ratio of the gears that drive them to rotate. In this solution, multiple sets of braking assemblies can be provided for step-by-step braking until the rotating shaft 200 stops rotating. For ease of understanding, only two sets of braking assemblies are provided for step-by-step braking in the embodiment of the present application.

As shown in FIG. 2 , a driving gear 210 is disposed on the side of the rotating shaft 200 . The driving gear 210 is coaxially and fixedly connected with the rotating shaft 200 for transmitting the kinetic energy of the rotating shaft 200 to the brake 300 . The brake 300 includes a first connection assembly 330 . The first connecting assembly 330 is used to transmit the kinetic energy of the rotating shaft 200 to the first braking assembly 310 . The first connection assembly 330 includes a differential 331 and a connecting rod 332 . Referring to FIG. 3 , the differential 331 includes a first gear 333 and a second gear 334 . The first gear 333 meshes with the driving gear 210 . The second gear 334 is coaxially connected with the connecting rod 332 . A locking device 335 is disposed on the connecting rod 332 . The lock 335 serves to limit the rotational tendency of the link 332 . Differential 331 can refer to existing automobile differential, when the rotation tendency of connecting rod 332 is restricted by locker 335, when drive gear 210 drives first gear 333 to rotate, can not drive connecting rod 332 to rotate, when When the locking device 335 releases the rotation restriction on the connecting rod 332 , the first gear 333 driven by the driving gear 210 will drive the second gear 334 and the connecting rod 332 connected with the second gear 334 to rotate. The purpose of this is that the kinetic energy transmitted by the driving gear 210 is consumed in the differential 331 when no braking is required, and the kinetic energy of the driving gear 210 is used to drive the connecting rod 332 to rotate when braking is required. The control method is simple and fast. It should be noted that the lever connected to the first gear 333 is rotatably connected to the housing 400 .

As shown in FIG. 4 , the locking device 335 includes an electromagnet disposed inside the connecting rod 332 and a friction brake assembly disposed on the side of the connecting rod 332 corresponding to the position of the electromagnet. The friction braking assembly includes a limiting plate 336 , a second spring 337 and a connecting piece 338 connected in sequence. The limiting plate 336 is attracted to the surrounding side of the connecting rod 332 when the electromagnet is energized, and is used to limit the rotation tendency of the connecting rod 332. The second spring 337 stores a part of elastic potential energy when the limiting plate 336 moves to the adsorption position. The connecting piece 338 is used for installing the limiting plate 336 to the suction position. When the electromagnet is powered off, the limiting plate 336 is separated from the connecting rod 332 under the tension of the second spring 337 . At this time, the connecting rod 332 and the second gear 334 can rotate under the driving of the first gear. It is worth noting that the electromagnet and the motor box 100 can use the same power source, so that when the motor box 100 is powered off, the locker 335 is automatically unlocked to trigger braking. Of course, the electromagnet can also use a separate power supply, so that when the motor box 100 needs to be powered on for braking, the locker 335 can also be powered off independently for unlocking.

The other end of the lower end of the connecting rod 332 relative to the second gear 334 is connected to the mounting base 340 by a rotating shaft. The mounting base 340 is fixedly connected to the motor box 100 . A third gear 339 is coaxially disposed on the connecting rod 332 close to the mounting base 340 . The third gear 339 meshes with the first driving plate 311 of the first brake assembly 310 . The third gear 339 is used to transmit the kinetic energy of the connecting rod 332 to the first braking assembly 310 .

It should be noted that, in order to drive the first drive plate 311 of the first brake assembly 310 to drive the slider 313 to slide inwardly in the radial direction for both forward and reverse rotation of the servo motor, the present application The connecting rod 332 is provided with a two-way input and one-way output structure, specifically a bidirectional driver shown in CN100445597C.

Referring to FIG. 5 and FIG. 6 , the first brake assembly 310 includes a slider 313 and a base 315 in addition to the above-mentioned first driving plate 311 . The first driving plate 311 , the sliding block 313 and the base 315 are sequentially sleeved around the rotating shaft 200 . The base 315 is connected to the mounting seat 340 through a connecting rod 319 disposed on a peripheral side. A plurality of arc-shaped sliding rails 312 are disposed on the first driving board 311 . Each slide rail 312 has only one end, and the other side communicates with the through hole of the first driving plate 311 for being sleeved on the rotating shaft 200 . In this application, the number of slide rails 312 is set to four. The number of slide blocks 313 is set in accordance with the slide rails 312 . The sliding block 313 is configured to be attached to the side of the rotating shaft 200 to match the rotating shaft 200 in an arc shape. A plurality of limiting ribs 318 are provided on the arc-shaped side for increasing the frictional force when the sliding block 313 is in contact with the rotating shaft 200 . A sliding column 314 is disposed on a surface of the slider 313 for connecting with the first driving board 311 . The diameter of the sliding post 314 can be slidably engaged with the sliding rail 312 . Preferably, the appearance of the sliding post 314 is tangent to the arc surface of the slider 313 for contacting the rotating shaft 200 , at this time, the inner diameter of the first driving plate 311 is equal to the sum of the diameter of the rotating shaft 200 and twice the sliding post 314 . The appearance of the sliding column 314 is not tangent to the arc surface of the sliding block 313 for contacting the rotating shaft 200 . At this time, the inner diameter of the first driving plate 311 is greater than the diameter of the rotating shaft 200 and twice the sum of the sliding column 314 . The connection between the slider 313 and the base 315 is provided with a radial sliding limit structure. The connecting surface of the sliding block 313 used to connect with the base 315 is provided with a radial sliding post. The base 315 is provided with a radial slide rail corresponding to the radial slide column. The slider 313 can only slide radially on the base 315 under the limitation of the radial sliding limit structure. The inner diameter of the first driving plate 311 is greater than or equal to the sum of the diameter of the rotating shaft 200 and twice the sliding column 314 . A sleeve 316 is sheathed around the sliding block 313 , and the sliding block 313 and the sleeve 316 are connected by a first spring 317 . When the slider 313 is not driven by the first driving plate 311 , the first spring 317 is in a contracted or non-deformed state. When the first brake assembly 310 performs braking, the first drive plate 311 rotates under the drive of the third gear 339, so that the slider 313 moves along the slide rail 312 to the direction close to the rotating shaft 200 until the slider 313 can closely fit to the The rotating shaft 200 achieves braking of the rotating shaft 200 in a rotating state. At this time, the sliding column 314 is tangent to the inner wall of the first driving plate 311 . When the rotating shaft 200 rotates at a low speed, only the first brake assembly 310 is needed to complete the braking, the kinetic energy of the rotating shaft 200 is converted into the kinetic energy of the unidirectional rotation of the first driving plate 311 through the first connecting assembly 330, and the slider 313 Driven by the first driving plate 311, the pulling force of the first spring 317 is overcome to lock the rotating shaft 200 towards the rotating shaft 200. When the speed of the rotating shaft 200 is reduced to the point where the first driving plate 311 and the slider 313 cannot be driven, and the speed is close to zero, the first driving The driving force of the plate 311 on the sliding block 313 is smaller than the pulling force of the first spring 317 on the sliding block 313, and the sliding block 313 returns to the slide rail 312 under the pulling force of the first spring 317 to complete the brake reset.

The second braking assembly 320 is used for triggering and superimposing braking on the rotating shaft 200 when the sliding block 313 of the first braking assembly 310 is fully moved to be attached to the rotating shaft 200 but the rotating shaft 200 cannot be braked. Specifically, the structure of the second brake assembly 320 is substantially the same as that of the first brake assembly 310, the only difference being that the rotational angular velocity of the second driving plate 321 of the second brake assembly 320 is smaller than that of the first brake assembly 310 of the first brake assembly 310. A rotational angular velocity of the drive plate 311 . There are many ways to adjust the rotational speed ratio of the first drive plate 311 and the second drive plate 321, which can be adjusted by adjusting the gear ratio of the two or by adjusting the gear ratio of the transmission gear between the two. In this application, by adjusting the gear ratio of the two Adjust the angular velocity. Specifically, the first driving board 311 and the second driving board 321 are connected by transmission through the second connecting assembly 350 . The second connection assembly 350 includes a fourth gear 351 meshed with the first drive plate 311, a fifth gear 352 meshed with the second drive plate 321, and a rod that connects the fourth gear 351 and the fifth gear 352 coaxially. 353. The bottom end of the rod 353 is connected to the mounting base 360 with a rotating shaft. The mounting base 360 is fixedly connected to the motor box 100 .

When the first drive plate 311 drives the slider 313 to the braking position, the rotating shaft 200 is still driving the first drive plate 311 to rotate due to the high speed, because the inner diameter of the first drive plate 311 is the diameter of the rotating shaft 200 and twice the same as the sliding column. The sum of the diameters of 314, at this time, the sliding column 314 is tangent to the rotating shaft 200 and the first driving plate 311 at the same time, the sliding column 314 cannot limit the rotation tendency of the first driving plate 311 but the first driving plate 311 will limit the sliding card of the sliding column 314 Closed between the rotating shaft 200 and the first driving plate 311 to maintain braking. The first driving plate 311 continues to rotate to drive the fourth gear 351 to rotate and drive the second driving plate 321 to rotate. It is worth noting that the first driving plate 311 has already started to drive the second driving plate 321 to rotate when it starts to rotate, but due to the difference in angular velocity between the two, the first driving plate 311 will first drive the slider 313 to the braking position for further braking. Braking, and then the second drive plate 321 drives the corresponding slider for braking, so as to achieve the purpose of superimposed braking in the present invention. Only two sets of brake assemblies are shown in the present invention, and multiple sets of brake assemblies can be provided for superimposed braking in practical applications.

The servo motor also includes a housing 400 for sheathing and protecting the brake 300 . The casing 400 is used to prevent external impurities from falling into the brake 300 and causing damage to the brake 300 when the servo motor is in use.

In the present invention, when performing braking, the power supply of the locker 335 can use the same power supply as that of the motor box 100, so that the locker 335 is unlocked when the motor box 100 is powered off, so that the inertia of the rotating shaft 200 is used to drive the braking assembly to perform braking. , in order to achieve the recycling of energy. The locker 335 can also be controlled by a separate power supply, so that the locker 335 can be unlocked when the motor box 100 is powered on, and a part of the kinetic energy of the rotating shaft 200 can be used for braking. This scenario is generally used for emergency braking where the power supply of the motor box 100 cannot be turned off immediately. .

Taking the same power supply of the locker 335 and the power supply of the motor box 100 as an example, when the locker 335 is powered off the motor box 100, the electromagnet contacts the attraction of the limit plate 336, and the connecting rod 332 can rotate. The rotating shaft 200 drives the connecting rod 332 to rotate through the drive gear 210 and the differential 331, and the connecting rod 332 is provided with a bidirectional driver, so that the connecting rod 332 rotates in one direction when the servo motor rotates forward and reverse. The connecting rod 332 drives the first brake assembly 310 and the second brake assembly 320 to act successively to brake the rotating shaft 200 . The specific action mode is described in detail above, and will not be repeated here. The present invention sets the first braking assembly 310 and the second braking assembly 320 that are associated and act in sequence to achieve superimposed braking on different speeds. When the first braking assembly 310 cannot quickly reduce the speed of the rotating shaft 200 to zero, the second Only the braking assembly 320 will brake the rotating shaft 200, so as to achieve the purpose of superimposed braking.

The above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solutions of the present invention, all of them should be included in the scope of the claims of the present invention. The technologies, shapes and construction parts not described in detail in the present invention are all known technologies.

Claims (10)

1. The utility model provides a servo motor with braking function, includes motor case (100) and pivot (200), its characterized in that still includes stopper (300), stopper (300) are including first brake subassembly (310) and second brake subassembly (320), first brake subassembly (310) cover is established pivot (200) week side, first brake subassembly (310) include first drive plate (311), second brake subassembly (320) include second drive plate (321), first drive plate (311) with second drive plate (321) are connected based on the gear train transmission, the rotational angular velocity of first drive plate (311) with the rotational angular velocity of second drive plate (321) is different, makes first brake subassembly (310) with second brake subassembly (320) action time is different.

2. The servo motor with a braking function according to claim 1, characterized in that a driving gear (210) is coaxially arranged on the peripheral side of the rotating shaft (200), the brake (300) further comprises a first connecting assembly (330), the first connecting assembly (330) comprises a differential (331) and a connecting rod (332), the differential (331) comprises a first gear (333) and a second gear (334), the first gear (333) is meshed with the driving gear (210), and the second gear (334) is coaxially connected with the connecting rod (332).

3. The servo motor with a braking function according to claim 2, wherein the first connection assembly (330) further comprises a locker (335), the locker (335) comprises an electromagnet arranged in the connecting rod (332) and a friction braking assembly arranged on the periphery side of the connecting rod (332), the friction braking assembly comprises a limiting plate (336), a second spring (337) and a connecting piece (338) which are connected in sequence, and the limiting plate (336) is in friction connection with the connecting rod (332) under the action of the electromagnet.

4. A servo motor with a braking function according to claim 3, characterized in that a third gear (339) is further coaxially arranged on the peripheral side of the connecting rod (332), the first driving plate (311) is meshed with the third gear (339), the first braking assembly (310) further comprises a sliding block (313), a sliding column (314) is arranged on the sliding block (313), a sliding rail (312) is arranged on the first driving plate (311) in a penetrating manner along the parallel axis direction, and the sliding column (314) is in sliding connection with the sliding rail (312).

5. The servo motor with a braking function according to claim 4, characterized in that the first braking assembly (310) further comprises a base (315) and a sleeve (316), the base (315) is slidably connected with the slider (313), and a first spring (317) is arranged on the inner wall of the sleeve (316) and connected to the periphery of the slider (313).

6. The servo motor with the braking function according to claim 5, wherein a limiting rib (318) is arranged on a connecting surface of the slider (313) corresponding to the rotating shaft (200).

7. The servo motor with braking function according to claim 6, characterized in that the first drive plate (311) and the second drive plate (321) are in driving connection based on a second connection assembly (350), the second connection assembly (350) comprising a fourth gear (351), a lever (353) and a fifth gear (352) connected in sequence, the fourth gear (351) being in mesh with the first drive plate (311), the fifth gear (352) being in mesh with the second drive plate (321).

8. The servo motor with a braking function according to claim 7, characterized in that the inner diameter of the first driving plate (311) is equal to or larger than the sum of the diameter of the rotating shaft (200) and twice the diameter of the sliding column (314), so that the sliding column (314) can be tangent to the inner wall of the first driving plate (311) when the slider (313) is attached to the rotating shaft (200).

9. The servo motor with braking function according to claim 8, wherein the connecting rod (332) is further provided with a bi-directional driver.

10. The servo motor with a braking function according to claim 6, characterized in that the servo motor further comprises a housing (400), the housing (400) being arranged outside the brake (300).

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