Brake structure for motor, motor and electric pump

Abstract

The utility model relates to the technical field of motors, in particular to a brake structure for a motor, which comprises a brake mounted on the motor, the brake comprises a brake disc capable of being attracted or released, the brake disc is fixedly connected with a rotating body of the motor, and the brake structure further comprises a control module for braking the brake when the motor is in a pressure building pause stage. The control module is in electric connection / signal connection with the motor. The motor comprises a motor body, and further comprises the brake structure for the motor. The electric pump comprises the motor and a pump body driven by the motor. The scheme is used for solving the problem that in the prior art, temperature rise of the motor is too fast due to the fact that the motor resists external resistance.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and in particular to a brake structure for a motor, a motor and an electric pump. Background Art

[0002] Adhesives are widely used in packaging, automotive, new energy, electronics, and construction. Adhesive delivery pumps typically use a pneumatic motor to reciprocate, driving a lower pump body. This reciprocating motion provides a continuous supply of adhesive. The combination of a pneumatic motor and lower pump body is called a pneumatic adhesive pump. Pneumatic adhesive pumps suffer from low efficiency (approximately 15%), high noise levels (high-pressure adhesive pumps typically exceed 85 decibels), and condensation.

[0003] Compared with traditional pneumatic glue pumps, the efficiency of electric glue pumps (motor + lower pump body) is increased from about 15% of pneumatic glue pumps to about 70%, and the noise is reduced from 85 decibels to 70 decibels. At the same time, the condensation problem is also eliminated. The pumping of this type of electric glue pump is shown in the "An Electric Glue Coating Drive Device" with patent announcement number CN212167989U applied for in 2019. In this disclosed patent technology, the motor used is a screw nut transmission method with a motor. The reciprocating movement of the screw nut along the screw drives the plunger rod of the lower pump body to move back and forth, thereby realizing continuous glue supply. There are also electric glue pumps whose motors use a servo motor + gear set. The servo motor provides power to the gear set, and the gear set is used to increase the torque. With the cooperation of the gear rack of the gear set, reciprocating linear output is realized, which drives the plunger rod of the lower pump body to move back and forth, thereby realizing continuous glue supply. In addition to the above effects, this type of electric glue pump currently has the following beneficial effects:

[0004] 1) It provides more precise flow and pressure control, which is critical to ensuring high quality adhesive application.

[0005] 2) Electric glue pumps are easy to integrate with modern manufacturing execution systems (MES) and enterprise resource planning (ERP) systems to achieve remote monitoring and control, promoting the automation and intelligence of production processes.

[0006] Therefore, the electric glue pump solution has the characteristics of high efficiency, low noise, environmental protection and reliability, and has great market prospects and social value.

[0007] However, with the iteration and upgrading of products, the market requirements for pumping high-viscosity adhesives have changed. It is necessary to ensure that the downstream of the electric pump output pipeline can obtain adhesive with higher pressure (usually the pressure ranges from 70-300 bar) in a timely manner to ensure a high flow rate / high flow rate of the adhesive sent to the downstream. At the same time, when supplying glue, it is necessary to ensure that the glue output end provides a long-term and stable supply to the downstream. Therefore, the electric glue pump needs to operate in a working-pressure-holding cycle mode. During operation, the electric glue pump pumps glue to the output pipeline. During the pressure-holding mode, the downstream valve of the output pipeline is closed and the output pipeline is maintained at the set pressure. At this time, although the electric glue pump has no output, it needs to withstand the pressure existing at the output end. This pressure will react on the lower pump body and be transmitted to the electric glue pump motor, forcing the motor to withstand high torque without motion output during the pressure-holding mode. When there is no output, the input energy of the motor is basically converted into heat energy, resulting in rapid temperature increase, which is not conducive to extending the life of the motor. The current conventional method is to set a cooling fan to continuously cool the motor, but the temperature of the motor is very high when it is in a stopped state, and both the motor and the cooling fan consume energy, which increases energy consumption and also causes great noise due to the operation of the cooling fan.

[0008] Taking actual application as an example, when the ambient temperature is room temperature and the working pressure of the electric glue pump output pipeline is about 180 bar, a frameless motor is used in a cyclic working mode of working for 20 seconds and holding pressure for 40 seconds. After running for 3 hours, the motor temperature rises to nearly 57°C during the holding pressure. The reason for the heat during the holding pressure stage is that the motor inputs reverse torque but has no output, so the input energy is basically converted into heat energy, causing the motor to heat up severely during the holding pressure stage, reducing the efficiency and service life of the motor, and restricting the intermittent pumping of the motor under holding pressure. This is also the extremely important reason why pneumatic motors still occupy the main market for intermittent pumping with high viscosity, high pressure and high flow rate in the current market.

[0009] Although the heating problem can be alleviated by adding cooling fans to the environment, this requires very high cooling. Adding cooling not only further increases energy consumption, but also brings noise problems, which greatly increases the pumping cost of electric pumps under intermittent pressure. Utility Model Content

[0010] The utility model aims to provide a braking structure for a motor, so as to solve the problem in the prior art that the motor temperature rises too quickly due to the motor resisting external resistance.

[0011] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0012] A braking structure for a motor includes a brake mounted on the motor, the brake including a brake disc that can be engaged or released, the brake disc being fixedly connected to the rotating body of the motor, and a control module for applying the brake when the motor is in a pressure-holding pause phase, the control module being electrically / signally connected to the motor.

[0013] The principle and advantage of this solution are: when adopting this solution, in the pressure-holding pause stage where the motor needs to withstand external resistance and has input but no output, the motor's own input is first used to resist the external resistance until the motor has no actual output and is in a fully pressure-holding state. Then the control module first locks the input or output end of the motor with the brake, thereby using the braking performance of the brake to resist the external torsional resistance, so that the motor can maintain a state without input for a long time even when there is still external resistance, greatly reducing or even avoiding the rapid heating of the motor caused by continued pressure-holding pause, thereby greatly reducing the operating temperature of the motor in the working-pressure-holding pause cycle mode, ensuring that the motor can still be used in the high viscosity, high pressure, high flow rate and working-pressure-holding pause cycle stage, ensuring the service life of the motor, control accuracy and energy saving and noise reduction, breaking the situation where only pneumatic electric glue pumps are used in such scenarios.

[0014] In addition, from the perspective of rubber pumping in this field, conventional rubber pumping is continuous low-flow pumping with a slow pumping speed. There is no need to install a brake in the electric pump. After the brake is not installed, the overall size of the motor becomes smaller, which is conducive to reducing the cost and promoting the use of electric pumps. In the field of pure motors, there are many cases where brakes are installed, such as the "An adjustable anti-rotation linear telescopic servo mechanism" with patent announcement number CN218771607U applied for in 2022. An electromagnetic holding brake is installed in the servo mechanism. The patent announcement number CN204794540U applied for in 2015 discloses a servo motor brake installation structure that also discloses the installation of a brake in the motor. There is also a small low-voltage servo motor brake with patent announcement number CN209472496U applied for in 2019. These motors are all disclosed to have brakes, but in the prior art, the brakes are installed on the motor for safety protection when the motor loses power, so that the brake can quickly clamp the motor that suddenly loses power to avoid the danger of the motor's output continuing to output under inertia, thereby achieving safety protection in emergency situations.

[0015] In this solution, the brake is no longer an emergency start when the motor loses power, but is intermittently started as a regular working part. Through this solution, the motor will not have excessive temperature rise when the electric pump is in a stopped state, which will affect the service life of the motor, thereby ensuring the service life of the motor; at the same time, when the brake is started, unlike the existing brake that locks the output during rotation, this solution first uses the motor's own output to put the entire electric pump in a basic static state with no output, and then allows the brake to lock the input or output end of the motor, ensuring that the brake is locked in a smooth manner, thereby ensuring the locking quality of the brake under intermittent use, ensuring that both the brake and the motor can take into account the service life, thereby ensuring the long-term use of the electric pump in the working-pressure-holding pause cycle working mode of such adhesives.

[0016] The utility model also provides a motor, comprising a motor body and the braking structure for the motor.

[0017] Preferably, as an improvement, an adapter plate is detachably connected to the rotating body of the motor body, and the adapter plate is detachably connected to the brake disc. Through the detachable connection between the adapter plate and the rotating body, on the one hand, the fixed connection between the brake disc and the adapter plate can be moved away from the rotation center of the rotating body through the adapter plate, thereby ensuring that the brake has a higher locking force during braking and improving the braking performance; on the other hand, the detachable connection between the adapter plate and the rotating body makes it possible to directly replace the adapter plate without replacing the rotating body of the motor if the adapter plate is damaged after multiple braking, thereby greatly reducing the maintenance cost; in addition, the setting of the adapter plate makes it possible to reduce the selection requirements of the brake through the design of the adapter plate regardless of the structure of the rotating body.

[0018] Preferably, as an improvement, the brake is detachably connected to the end cover plate of the upper shell of the motor body to facilitate the disassembly and assembly of the brake.

[0019] Preferably, as an improvement, the motor body is a servo motor capable of forward and reverse rotation, and the rotating body is the rotating spindle in the servo motor; or, the motor body is a frameless motor, and the rotating body is the rotor in the frameless motor.

[0020] Preferably, as an improvement, the output of the frameless motor is the linear movement of the screw, and an anti-rotation component is installed on the frameless torque, the anti-rotation component includes a rolling body and a guide groove, the rolling body can roll in the guide groove, the guide groove is parallel to the axis of the screw, one of the rolling body and the guide groove is installed on the screw, and the other is fixedly installed relative to the motor housing.

[0021] Beneficial effect: The output of the frameless motor with a rotor is the linear output of the screw. In order to ensure high-precision control of the linear output of the screw, the anti-rotation component is provided with rolling bodies and guide grooves. The cooperation of the rolling bodies and the guide grooves can guide the axial movement of the screw, ensuring the stability and accuracy of the linear movement. The cooperation between the guide grooves and the rolling bodies can avoid sliding friction during the guiding process, thereby reducing the wear rate. Especially in this scheme, when the motor is working and there is pressure buildup, the motor needs to withstand large torque. The presence of rolling bodies will undoubtedly have an outstanding effect on reducing wear.

[0022] Preferably, as an improvement, the anti-rotation assembly includes a fixedly mounted guide seat, a guide groove is provided on the guide seat, the center axis of the rolling body is fixed on the screw, and the outer ring of the rolling body is used to roll in the guide groove, so as to take into account both the guiding performance and the cost.

[0023] Preferably, as an improvement, an adapter sleeve is fixed on the screw, and the adapter sleeve is matched with the screw in a concave-convex manner. There are multiple rolling bodies, and the multiple rolling bodies are located circumferentially of the adapter sleeve. The center axis of the rolling body passes through the radial hole on the adapter sleeve and is fixedly connected to the screw, and the center axis is gap-matched with the radial hole.

[0024] Beneficial effects: When this solution is adopted, since the motor needs to withstand large torque during the pressure-holding pause stage, the torque will be transmitted to the screw, and the rolling elements installed on the screw will also withstand the torque. The farther away from the center of the screw, the greater the force, and the greater the force acts on the adapter sleeve. On the one hand, even if the radial hole port of the adapter sleeve is worn due to long-term torque, the adapter sleeve can be directly replaced to reduce replacement costs. On the other hand, due to the concave-convex fit between the adapter sleeve and the screw, the large torque borne by the adapter sleeve can be quickly transmitted to the thicker part of the screw structure through the fixed connection between the adapter sleeve and the screw, avoiding the problem of excessive force in the weak area of the screw in a short period of time and increasing the risk of damage.

[0025] Preferably, as an improvement, an oil adding channel is provided on the guide seat to facilitate the addition of lubricating oil through the oil adding channel.

[0026] The utility model also provides an electric pump, comprising the motor and a pump body driven by the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic front view (with partial section) of the first embodiment of the present invention.

[0028] Figure 2 This is a schematic diagram of the three-dimensional structure of the motor according to the third embodiment of the present invention.

[0029] Figure 3 for Figure 2 rear view.

[0030] Figure 4 for Figure 2 Schematic diagram of the axial section of the motor body.

[0031] Figure 5 This is a schematic diagram of the three-dimensional structure of the motor according to the fourth embodiment of the present utility model.

[0032] Figure 6 for Figure 5 Schematic diagram of the axial section.

[0033] Figure 7 This is a schematic diagram of the three-dimensional structure of the fourth embodiment, which only shows the combination of the lead screw, the guide seat, and the adapter sleeve.

[0034] Figure 8 for Figure 7 main view.

[0035] Figure 9 for Figure 8 AA rotated section view in.

[0036] Figure 10 for Figure 7 Exploded diagram of the lead screw, guide seat, and adapter sleeve.

[0037] Figure 11 for Figure 10 Schematic diagram of the three-dimensional structure after rotating 90°.

[0038] Figure 12 This is a schematic front view of an electric pump according to a fifth embodiment of the present invention.

[0039] Figure 13 This is a line graph of temperature change and temperature difference change in Test A and Test B in Example 6 of the present utility model.

[0040] Figure 14 This is a temperature change diagram of Test C in Example 6 of the present utility model.

[0041] Figure 15 This is a temperature change diagram of Test D in Example 6 of the present utility model.

[0042] Figure 16 This is a temperature change diagram of Test E in Example 6 of the present utility model. DETAILED DESCRIPTION

[0043] The following is further described in detail through specific implementation methods:

[0044] The reference numerals in the accompanying drawings of the specification include: .

[0045] Motor 10 , lower pump body 20 , drive rod 201 , brake 30 , brake disc 301 , adapter disc 302 , encoder 40 , rotating part 101 , housing 11 , cover plate 111 .

[0046] Example 3: Servo motor body 1, housing 11, rotating main shaft 101, driving gear 102, reduction gear assembly 2, first transmission large gear 21, first transmission small gear 22, second transmission large gear 23, second transmission small gear 24, rack 25.

[0047] Example 4: housing 11 , stator 12 , rotor 101 , ball screw 13 , lead screw 14 , guide seat 15 , guide groove 151 , oil supply channel 152 , rolling element 16 , adapter sleeve 17 .

[0048] Example 1

[0049] Combine Figure 1 A motor includes a motor body and a brake structure for the motor. The brake structure includes a brake 30 mounted on the motor. The brake 30 includes a brake disc 301 that can be engaged or released. The brake disc 301 is fixedly connected to a rotating body on the motor body. An adapter disc 302 is detachably connected to the rotating body of the motor body. The adapter disc 302 is detachably connected to the brake disc 301. In this embodiment, the detachable connection can be a screw connection.

[0050] In this embodiment, the brake 30 and the motor body are connected by an adapter plate 302 fixed on the rotating body. On the one hand, the adapter plate 302 allows the fixed connection between the brake disc 301 and the adapter plate 302 to be away from the rotation center of the rotating body, thereby ensuring that the brake 30 has a higher locking force during braking and improving the braking performance; on the other hand, the detachable connection between the adapter plate 302 and the rotating body allows the adapter plate 302 to be directly replaced if it is damaged after multiple braking without replacing the rotating body of the motor, thereby greatly reducing maintenance costs; in addition, the setting of the adapter plate 302 allows the selection requirements of the brake 30 to be reduced by designing the adapter plate 302 regardless of the structure of the rotating body.

[0051] In addition, in order to facilitate the disassembly of the brake 30 , the brake 30 is fixed on the end cover 111 of the upper housing 11 of the motor body.

[0052] Example 2

[0053] The second embodiment is improved on the basis of the first embodiment as follows: the braking structure for the motor further includes a control module for braking the brake 30 when the motor is in a pressure-holding pause stage, and the control module is electrically connected / signally connected to the motor.

[0054] The control module is used to control the brake 30 to lock the rotating body after the motor enters the pressure holding pause stage, and then control the motor to stop input.

[0055] The braking structure for the motor further includes an encoder 40 for monitoring the rotational speed of the rotating body.

[0056] When this embodiment is adopted, in the pressure-holding pause stage where the motor 10 needs to withstand external resistance and has input but no output, the motor's own input is first used to offset the external resistance until the motor 10 has no actual output and is in a completely pressure-holding state. Then the control module first locks the input or output end of the motor with the brake 30, thereby utilizing the braking performance of the brake 30 to resist the external torsional resistance, making it convenient for the motor 10 to maintain a state without input for a long time even when there is still external resistance, greatly reducing or even avoiding the rapid heating of the motor caused by continued pressure-holding pause, thereby greatly reducing the operating temperature of the motor 10 in the working-pressure-holding pause stage cycle mode, ensuring that the motor 10 can still be used in the high viscosity, high pressure, high flow rate and working-pressure-holding pause cycle stage, thereby ensuring the service life, control accuracy and energy saving and noise reduction of the motor 10.

[0057] Example 3

[0058] Example 3 Based on Example 1 or Example 2, the motor is further refined. Figures 2 to 4 The motor of this embodiment includes a motor body 1 and a reduction gear assembly 2, which are specifically described as follows:

[0059] The motor body 1 is a servo motor 1 capable of forward and reverse rotation. The output of the servo motor body 1 is a rotating spindle 101 capable of forward and reverse rotation. The rotating spindle 101 drives the reduction gear assembly 2 to reduce speed and finally outputs linearly via the rack 25 .

[0060] The brake 30 is installed in the housing 11 of the motor body 1 to lock the rotating main shaft 101. Specifically, one end of the brake 30 is fixed in the housing 11 of the motor body 1, and the brake disc 301 at the other end of the brake 30 (such as the armature of the disc electromagnetic brake 30) is fixed to the brake adapter disc 302 by screws, and the brake adapter disc 302 is fixed on the rotating main shaft 101, so that when braking, the brake disc 301 brakes the rotating main shaft 101 through the brake adapter disc 302.

[0061] The relationship between the rotating main shaft 101 and the reduction gear assembly 2 can be as follows:

[0062] A driving gear 102 is fixed on the rotating main shaft 101, and the reduction gear assembly 2 includes a first transmission shaft and a second transmission shaft rotatably connected to the casing, a first transmission gearwheel 21 and a first transmission pinion 22 are fixedly mounted on the first transmission shaft, and a second transmission gearwheel 23 and a second transmission pinion 24 are fixed on the second transmission shaft, the first transmission gearwheel 21 of the first transmission shaft is engaged with the driving gear 102, and the first transmission pinion 22 is engaged with the second transmission gearwheel 23, the reduction gear group also includes a rack 25 slidably connected to the casing, and the second transmission pinion 24 is engaged with the rack 25, the rotating main shaft 101 of the motor body drives the gears of the reduction gear assembly 2 to rotate for deceleration, and finally drives the rack 25 to move linearly after deceleration.

[0063] In this embodiment, the driving gear 102 on the rotating main shaft 101 of the servo motor 1 drives the first transmission gear 21 to rotate, so that the first transmission pinion 22 coaxially connected to the first transmission gear 21 drives the second transmission gear 23 to rotate, and then the second transmission pinion 24 coaxially connected to the second transmission gear 23 drives the rack 25 to output linear motion.

[0064] The entire motor can achieve high torque output of the motor 10 through the transmission of the servo motor 1 and the reduction gear assembly 2. At the same time, during the pressure-holding pause stage, the brake 30 can be used to replace the input of the motor body 1 to overcome the pressure-holding torque, ensuring that the entire motor 10 does not heat up too quickly during the pressure-holding pause stage and affect the motor life.

[0065] Example 4

[0066] This fourth embodiment also refines the motor based on the first or second embodiment, as follows:

[0067] Combine Figures 5 to 11 The motor 10 of this embodiment is a frameless motor with a stator 12 and a rotor 101. The frameless motor includes a housing 11, a stator 12 fixed in the housing 11, a rotor 101 rotatably connected in the housing 11, a ball nut 13 that rotates synchronously with the rotor 101, and a lead screw 14 that is sleeved in the ball nut 13 and moves axially.

[0068] The brake 30 is installed in the housing 11, one end of the brake 30 is fixed in the housing 11, and the brake disc 301 at the other end of the brake 30 (such as the armature of the disc electromagnetic brake 30) is fixed on the brake adapter disc 302, and the brake adapter disc 302 is fixedly connected to the rotor 101, so that during braking, the brake disc 301 brakes the rotor 101 through the brake adapter disc 302.

[0069] In this embodiment, the rotor 101 is braked by the brake 30 , so that the braking is controlled from the power source of the electric pump, which helps to ensure the braking effect.

[0070] The frameless motor 10 also includes an anti-rotation assembly, which includes a guide seat 15 fixedly mounted on the housing 11, and a rolling element 16 axially slidably connected to the guide seat 15. The central axis of the rolling element 16 is fixedly connected to the screw 14, and the central axis of the rolling element 16 is radial to the screw 14. There are multiple rolling elements 16, and the multiple rolling elements 16 are symmetrically arranged about the center of the screw 14. A guide groove 151 is defined in the guide seat 15. When the screw 14 moves, the outer ring of the rolling element 16 can roll along the guide groove 151. The rolling element 16 of this embodiment is a bearing. In this embodiment, the cooperation between the guide groove 151 and the rolling element 16 avoids sliding friction during the guiding process, thereby reducing the wear rate. In particular, when the motor 10 of this embodiment is operating under pressure and needs to withstand high torque, the presence of the rolling element 16 undoubtedly has a significant effect on reducing wear, helping to ensure the output accuracy and service life of the motor 10.

[0071] An adapter sleeve 17 is fixed on the screw 14, and the adapter sleeve 17 and the screw 14 are matched in a concave-convex manner. A radial hole is provided in the radial direction of the adapter sleeve 17. The central axis of the rolling body 16 passes through the radial hole on the adapter sleeve 17 and is fixedly connected to the screw 14. The central axis and the radial hole are clearance-matched. A section of the central axis that is clearance-matched with the radial hole is a smooth section, which facilitates the installation of the rolling body 16 and facilitates the transmission of the torque borne by the rolling body 16 to the adapter sleeve 17 through the smooth section.

[0072] In order to facilitate the addition of lubricating oil to the screw 14 and the nut 13, an oil adding channel 152 is opened at the root of the guide seat 15 close to the housing 11. The oil adding channel 152 can be an oil adding hole, an oil adding notch or an oil adding groove.

[0073] Example 5

[0074] Combine Figure 12 An embodiment provides an electric pump, comprising the motor 10 of embodiment three or embodiment four and a lower pump body 20 driven by the motor 10. The output of the motor 10 is a linear reciprocating movement, and the output of the motor 10 is fixedly connected to the drive rod 201 of the lower pump body 20, so that the reciprocating movement of the output end of the motor 10 drives the lower pump body 20 to pump the fluid.

[0075] Example 6

[0076] Implement six tests to verify the motors of electric pumps with and without brake structures, as follows:

[0077] Taking the specific verification tests A and B as an example, two identical electric pumps are taken. The motors of the electric pumps are both frameless motors. The frameless motors can use excitation to brake the rotor. At the same time, the frameless motor of test B is equipped with a brake that can brake the rotor. The two electric pumps of tests A and B are allowed to work for more than 3 hours in exactly the same working environment (ambient temperature 20℃-22℃), in exactly the same working mode (working 20s-holding pressure 40s cycle) and under exactly the same working pressure (working pressure is 180bar, which is the pressure that needs to be maintained on the output pipeline of the electric pump).

[0078] During the more than three-hour test process, Test A used the motor's own excitation to brake the motor during each 40-second pressure-holding stage, while Test B used the frameless motor's excitation to brake the motor rotor at the beginning of the pressure-holding stage until the rotor came to a complete stop during the pressure-holding stage. The brake was then activated to brake the rotor. After the brake was applied, the frameless motor's input was stopped, allowing the brake to independently withstand the pressure-holding torque.

[0079] Specifically, the brake activation conditions of Test B are as follows: Condition 1) the rotor speed is reduced to less than 3RPM, Condition 2) the rotor speed change rate is less than 0.01RPM / s, Condition 3) the electric pump outlet pressure change rate is less than 0.001bar / s, and after the duration of conditions 1)-3) exceeds 1 to 3 seconds, ensure that the rotor has stopped rotating by using the excitation brake, and then start the brake mode of the brake to allow the brake to resist the torque caused by the pressure holding. During the pressure holding stage, the time used to use the brake to resist the torque caused by the working pressure occupies most of the pressure holding time (in the 40 seconds of pressure holding, the time of using the frameless motor excitation braking is about 3 seconds, and the braking time of the brake is about 37 seconds), so that the frameless motor is completely paused for most of the time during the pressure holding stage, thereby avoiding the heat caused by the pressure holding in the frameless motor.

[0080] The test process is to monitor the winding temperature of the frameless motor in real time, record the average temperature in each cycle, and draw a temperature change graph based on the temperature of each cycle (the temperature can be the average temperature in each cycle or the temperature at the end. This test uses the average temperature obtained by averaging multiple groups of temperatures tested in each 1-minute cycle). The specific test records are shown in the table below. The temperature changes and temperature difference changes drawn according to the table below are shown in the figure below. Figure 13 shown.

[0081] Test process record sheet for test A and test B

[0082]

[0083]

[0084]

[0085] From the test results of Test A and Test B, it can be seen that after more than three hours of continuous operation in the mode of working for 20 seconds and holding pressure for 40 seconds, the winding temperature of Test B after braking by brake intervention during the holding pressure stage was only below 43°C, while Test A relied on excitation braking throughout the holding pressure stage, and the winding temperature exceeded 55°C, even reaching 57°C.

[0086] At present, the normal working condition of high-viscosity and high-pressure pumping is continuous operation for more than 3 hours. Under this normal condition, the winding temperature of the frameless motor in Test A has reached 57°C, which has a great negative impact on the life of the motor. According to the trend in the attached figure, if the operation continues, the temperature will continue to rise, which will greatly affect the life of the frameless motor.

[0087] In contrast, Test B in this embodiment adds and controls the brake so that the maximum temperature does not exceed 43°C after 3 hours of continuous operation, significantly reducing the temperature of the frameless motor during pumping operation, and helping the electric motor to achieve intermittent pumping under high viscosity and high pressure conditions. After adopting the solution of Test B, not only is the temperature reduced, but the energy consumption caused by the excitation braking of the frameless motor is also greatly saved, which helps to promote energy conservation and environmental protection. In addition, under the solution of Test B, the maximum temperature can be kept below 43°C without the need for a cooling fan, and the cooling fan can be eliminated in actual applications, thereby reducing costs and reducing the noise when the electric pump is working.

[0088] In addition, in Test B, it is clearly seen that the temperature rise rate of the winding slows down after 3 hours of continuous operation. In order to verify whether the slow temperature rise trend is maintained if the test is continued for a longer time under the scheme of Test B, the inventors conducted Test C using the brake during the pressure holding stage. The test conditions of Test C are the same as those of Test B, but the test time is extended to 4.5 hours. The temperature change diagram obtained from the test results is shown in the figure below. Figure 14 As shown, in test C, after working for 3 hours, the temperature is close to 43°C, and after working for 4.5 hours, the winding temperature is only about 45°C.

[0089] In the case of frameless motor excitation braking, it can be seen from test A that the temperature rises in a sawtooth pattern within 3 hours of the test. To avoid the accidental nature of the test, the inventors conducted test D with the same equipment, the same ambient temperature, and the same working pressure as test A. In test D, the winding temperature reached 51°C after 2 hours of testing (combined with the Figure 15 The temperature change diagram of test D is basically consistent with that of test A, and the temperature rise of test D still shows a sawtooth change.

[0090] Therefore, the inventors conducted another experiment E. The difference between experiment E and experiment D is that the experiment lasted longer, 400 minutes. The test results are as follows: Figure 16 As shown, Figure 16 In the experiment, the winding temperature of the frameless motor continued to rise in a sawtooth pattern. Combining experiments A, D and E, it can be seen that the temperature change of the frameless motor with excitation braking reflects the change of the frameless motor. After 4.5 hours of testing, the winding temperature was already 60°C, and the temperature difference with that of the test C during this period reached 15°C. The test E continued, and the temperature continued to rise. After 5.5 hours of testing, the temperature rise approached 64°C. This sawtooth temperature rise shows that the frameless motor is unstable when working in the working-pressure holding cycle mode, which is not conducive to the long-term use of the frameless motor in the working-pressure holding cycle mode. However, after the present invention uses the brake as shown in experiments B and C, the temperature is lower, and the temperature rise slows down after long-term use. The temperature rise of the frameless motor is also stable, which is more conducive to the use of the frameless motor in all aspects, and the superiority of the solution under the braking of the brake is more prominent.

[0091] The above description is merely an embodiment of the present invention, and the commonly known specific technical solutions and / or features of the solution are not described in detail here. It should be noted that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be considered as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection claimed in this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A brake structure for a motor, comprising a brake mounted on the motor, the brake comprising a brake disc capable of being engaged or released, characterized in that: The brake disc is fixedly connected to the rotating body of the motor, and also includes a control module for braking when the motor is in a pressure-holding pause stage. The control module is electrically connected / signally connected to the motor.

2. A motor, comprising a motor body, characterized in that: It also includes the braking structure for a motor as claimed in claim 1.

3. The motor according to claim 2, characterized in that: The rotating body of the motor body is detachably connected with an adapter disc, and the adapter disc is detachably connected to the brake disc.

4. The motor according to claim 2, characterized in that: The brake is detachably connected to the end cover plate of the upper shell of the motor body.

5. The motor according to claim 2, characterized in that: The motor body is a servo motor capable of forward and reverse rotation, and the rotating body is a rotating main shaft in the servo motor; or the motor body is a frameless motor, and the rotating body is a rotor in the frameless motor.

6. The motor according to claim 5, characterized in that: The output of the frameless motor is the linear movement of the screw. An anti-rotation component is installed on the frameless torque. The anti-rotation component includes a rolling body and a guide groove. The rolling body can roll in the guide groove. The guide groove is parallel to the axis of the screw. One of the rolling body and the guide groove is installed on the screw, and the other is fixedly installed relative to the motor housing.

7. The motor according to claim 6, characterized in that: The anti-rotation assembly includes a fixedly installed guide seat, a guide groove is provided on the guide seat, a central axis of the rolling body is fixed on the lead screw, and an outer ring of the rolling body is used to roll in the guide groove.

8. The motor according to claim 7, characterized in that: An adapter sleeve is fixed on the screw, and the adapter sleeve and the screw are matched in a concave-convex manner. There are multiple rolling bodies, and the multiple rolling bodies are located in the circumference of the adapter sleeve. The center axis of the rolling body passes through the radial hole on the adapter sleeve and is fixedly connected to the screw, and the center axis and the radial hole are gap-matched.

9. The motor according to claim 7, characterized in that: An oil adding channel is provided on the guide seat.

10. An electric pump, characterized in that: The pump comprises a motor as described in any one of claims 2 to 9 and a pump body driven by the motor.

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