CN112072856A

CN112072856A - Coaxial servo system of leakage type motor oil pump

Info

Publication number: CN112072856A
Application number: CN202011035455.9A
Authority: CN
Inventors: 邓杰全; 李伟
Original assignee: Jiangmen Yingkesong Electric Co ltd
Current assignee: Jiangmen Yingkesong Electric Co ltd
Priority date: 2020-09-27
Filing date: 2020-09-27
Publication date: 2020-12-11

Abstract

The invention discloses an oil pump coaxial servo system of an outward-leakage motor, wherein the motor and the oil pump are provided with a common oil pump motor shaft, an outward-leakage oil port is arranged on the oil pump, and a servo driver is provided with a main control circuit board; an oil outlet flange is arranged at an output port of the oil pump, the pressure sensor is mounted on the oil outlet flange and used for feeding back the actual pressure of the oil outlet to the main control circuit board of the servo driver for pressure closed-loop control; the motor is internally provided with the motor encoder, and the motor encoder is used for detecting the rotating speed of the motor and feeding back the rotating speed of the motor to the main control circuit board of the servo driver. The effect is as follows: by integrating the oil pump, the motor and the servo driver, the overall volume of the system is effectively reduced, the energy density of the system is improved, and the use cost and the maintenance cost of a user are reduced; through increasing the oil pump function of leaking, improve the life of oil pump, stabilize oil pressure output, reduce manufacturing cost and the degree of difficulty.

Description

Coaxial servo system of leakage type motor oil pump

Technical Field

The invention relates to the technical field of servo systems, in particular to an external leakage type motor oil pump coaxial servo system.

Background

The servo system of following motor and oil pump exists among the prior art, specifically is:

1. the whole set of servo system is composed of five parts, namely a motor, an oil pump, a servo driver, a pressure sensor and a motor encoder, wherein the motor and the oil pump are connected through a bracket and a coupler or a spline, and the driver is independent of the motor and the oil pump in an equipment electric cabinet. Driver, motor, pressure sensor and motor encoder pass through cable junction, form rotational speed and pressure closed-loop control's two closed-loop servo system, and its defect is: the whole system has larger volume, and the installation cost and the material cost of a user are increased; the noise of the oil pump is larger; the oil pump and the motor are connected through the bracket and the coupling, and the accumulated concentricity and the verticality deviation on the machine are large. Under the great condition of concentricity and straightness deviation that hangs down, through plum blossom bullet pad formula coupling joint, though can compensate partial concentricity and straightness deviation problem that hangs down, still there is shaft coupling bullet pad at the continuous repeated compression of motion process and leads to life-span problem and noise problem. Because the system has high universal matching performance, if a customer adopts a plurality of suppliers to respectively provide the motor, the oil pump, the bracket and the coupling, the processing precision and the matching degree of the customer are different, the error of the whole system is caused, the performance and the service life of the system are different, and the troubleshooting difficulty and the responsibility division of the suppliers are increased; the system inertia is large. By using a coupler and bracket structure, the axial lengths of the oil pump and the motor and the inertia of the coupler are increased; the pressure maintaining rotation speed fluctuation of the rotation speed during oil pressure control is large, the current peak value is high, and the rotation speed fluctuation is large due to unstable rebound force caused by the back and forth compression of the plum blossom spring cushion of the coupler; the current peak value is higher due to the braking and the output of the motor in the process; the following performance to the pressure and rotation speed instruction is poor. The system response time is slow due to the large overall inertia. In the control process, the reflected position repetition precision of the controlled oil cylinder is low;

2. the Chinese patent with publication number CN108916042A provides a servo system, the whole set of servo system is composed of five parts, namely a motor, an oil pump, a servo driver, a pressure sensor and a motor encoder, the motor and the oil pump are coaxially and integrally connected, and the driver is independent of the motor and the oil pump in an equipment electric cabinet. Driver, motor, pressure sensor and motor encoder pass through the cable connection, form rotational speed and pressure closed-loop control's two closed-loop servo system, and its defect is: the oil pump is easy to wear in the long-time pressure maintaining process to cause efficiency reduction or failure; besides the external driver and the motor oil pump, the system has large volume, and the installation cost and the material cost of a user are increased;

3. a servo system is given in the chinese patent with publication number CN108880123A, and a whole set of servo system passes through five major components of motor, oil pump, servo driver, pressure sensor, motor encoder and constitutes, and motor and oil pump pass through bracket and coupling joint, and the driver is integrative with the motor, and pressure sensor passes through among the cable junction to integral type servo motor, forms rotational speed and pressure closed-loop control's two closed-loop servo system, and its defect is: due to the fact that the bracket and the coupler are connected with the oil pump, the problems of noise, concentricity, maintenance difficulty, system inertia, large rotating speed fluctuation, high current peak value, pressure rotating speed instruction following performance, system size and the like in the prior scheme I are caused; in the integrated servo motor scheme, a capacitor and a resistor exist between a fan and a motor in the aspect of heat dissipation, the structure is complex, the heat dissipation is insufficient, and the design limits the power grade of a using system; due to the addition of the heat dissipation structure, the length of the whole system is increased, and the use cost of a customer is increased; if the system length is shortened, the system power level is reduced; due to the electronic components, such as capacitors and brake resistors (the driver assemblies 301 and 303 described in the patent documents), the humidity of the components and the greasy dirt and dust (even metal dust) in the production environment are increased in the air duct for a long time, so that the heat dissipation of the components is insufficient or short-circuited, and the service life of the whole system is difficult to guarantee.

Disclosure of Invention

Therefore, the invention provides an external leakage type motor oil pump coaxial servo system, which aims to solve the problems in the prior art, and particularly solves the technical problem in the scheme 1 that: the inertia of the system is reduced, the peak current of the system is reduced, the noise of an oil pump is reduced, the volume of the whole system is reduced, the output precision, the response speed and the following performance of the system are improved, and the stability of the rotating speed is improved; the technical problem in scheme 2 is: the service life of the oil pump and the volume of the system; the technical problem in scheme 3 is as follows: the drive assembly and protection class problems of the motor, the life problems of the electrical components, the associated problems of the system using couplings and brackets.

In order to achieve the above purpose, the invention provides the following technical scheme:

according to a first aspect of the present invention, an oil pump coaxial servo system of an external leakage type motor comprises a motor, an oil pump, a servo driver, a motor encoder and a pressure sensor; the motor and the oil pump are provided with a common oil pump motor shaft, an oil outlet is formed in the oil pump, and the servo driver is provided with a main control circuit board; an oil outlet flange is arranged at an output port of the oil pump, the pressure sensor is mounted on the oil outlet flange and used for feeding back the actual pressure of the oil outlet to the main control circuit board of the servo driver for pressure closed-loop control; the motor is internally provided with the motor encoder, and the motor encoder is used for detecting the rotating speed of the motor and feeding back the rotating speed of the motor to the main control circuit board of the servo driver.

The motor further comprises a motor shell and a motor main body, wherein the motor shell is sleeved on the outer peripheral side of the motor main body and consists of a motor front end cover, an aluminum profile radiator and a motor rear cover; the motor main body consists of a motor shaft, a rotor and a stator; the motor encoder is independently installed on the motor rear cover.

Further, still include first radiator fan, first radiator fan sets up in the motor housing, first radiator fan is used for to the motor housing carries out the heat dissipation cooling.

Further, the oil pump also comprises a rear pump shell and a front pump shell, and the rear pump shell, the front pump shell and the internal fittings of the oil pump are assembled to form the oil pump; the front pump shell is provided with an oil guide groove for prompting the fault of the oil pump to customers and preventing the damage of leaked hydraulic oil to the motor; the rear pump shell and the motor main body are assembled together through a motor shaft of the oil pump, and the middle of the rear pump shell is fixed through a spigot of the motor main body; the outer oil leakage port is arranged on the rear pump shell, the front pump shell or the oil outlet flange.

Further, the device also comprises a first sliding bearing, a second sliding bearing and a framework oil seal; the first sliding bearing and the second sliding bearing are arranged in the oil pump and used for fixing a motor shaft of the oil pump and improving the concentricity; the skeleton oil seal sleeve is arranged on a motor shaft of the oil pump and used for forming the seal inside the oil pump.

Further, the power module comprises a power module circuit board and a driver assembly; the power module circuit board is used for controlling the motor and related direct current power supply conversion and alternating current power supply conversion according to the instruction of the main control circuit board; the driver assembly is used for matching the power module circuit board of the servo driver to perform power supply conversion; the main control circuit board is provided with a main chip and is used for collecting signals of the pressure sensor, signals of the motor encoder and instructions and signals of the upper computer, so that closed-loop control of pressure flow is performed, and the main control circuit board is electrically connected with the power module circuit board to control operation of the motor.

Furthermore, the cooling device also comprises a second cooling fan and a one-way exhaust valve; the second heat dissipation fan is used for forcibly circulating air inside the servo driver, and is also used for dissipating heat of a chip, an electrolytic capacitor and a related power tube inside the servo driver; the servo driver is characterized in that the one-way exhaust valves with the same direction are installed on two sides of the servo driver and provided with filter screens.

Further, the device also comprises a communication port, an aviation plug and a brake resistor; the communication port is used for communicating the running data and the setting parameters of a driver related to the external communication of the main control circuit board, the communication port supports an operator or a handheld panel to input the parameters, the communication port is used for connecting a computer to read the running data and the setting parameters, the communication port supports a Bluetooth module, a WiFi module and an industrial 4.0 related Internet of things communication module, and the communication port is provided with a rubber plug; the aviation plug is used for butting the pressure sensor and the main control circuit board to be electrically connected; the brake resistor is arranged outside the motor shell and is used for matching the control effect of the servo driver.

The oil leakage port is internally provided with the diverter valve, the diverter valve is used for connecting an oil pipe to an oil tank, and a plurality of penetrating fine holes are formed in the diverter valve; through a plurality of the pore dispersion leak the oil pressure of hydraulic fluid port outward, realize the partial pressure and leak for reduce leak the hydraulic fluid port at the noise of oil extraction process outward.

Further, the motor shell is a liquid cooling motor shell or an air cooling motor shell;

when the motor shell is the liquid-cooled motor shell, a cooling liquid diversion trench is arranged on the liquid-cooled motor shell and used for guiding cooling liquid to flow in the motor shell according to a preset direction and dissipating heat of the motor body, a motor body installation cavity is arranged in the liquid-cooled motor shell and used for installing the motor body, a liquid inlet and a liquid outlet are arranged on the side wall of the liquid-cooled motor shell and used for guiding circulating cooling liquid into the liquid-cooled motor shell so as to take away system heat; the liquid cooling motor shell is also provided with a liquid cooling motor front end cover, a liquid cooling motor rear end cover, a motor wire outlet box and a fixing screw which jointly form a liquid cooling heat dissipation structure of the motor, and an internal wiring of the motor extends out of the motor main body and is led out of the liquid cooling motor rear end cover to the servo driver;

when the motor shell is the air-cooled motor shell, a servo driver heat dissipation step is arranged on the outer side of the air-cooled motor shell and is used for butting the power module circuit board in the servo driver and transferring heat of the power module circuit board to the air-cooled motor shell; the air-cooled motor shell is further provided with an air-cooled radiating fin, an air-cooled motor rear end cover, an air-cooled motor front end cover and a motor fan shell, the air-cooled radiating fin is enlarged according to different motor powers, different lengths and different volume changes of the motor shell, the air-cooled motor rear end cover is used for leading out the wire of the motor, the motor encoder is installed and butted with the first radiating fan, the air-cooled motor front end cover is used for leading out the shaft of the motor and butting with the oil pump installation spigot, the motor fan shell is used for installing and protecting the first radiating fan, a wire outlet is formed in the air-cooled motor rear end cover and used for connecting the internal wiring of the motor to the servo driver.

The invention has the following advantages:

1. by integrating the oil pump, the motor and the servo driver, the overall volume of the system is effectively reduced, the energy density of the system is improved, and the use cost and the maintenance cost of a user are reduced;

2. by increasing the leakage function of the oil pump, the service life of the oil pump is prolonged, the oil pressure output is stabilized, and the manufacturing cost and difficulty are reduced;

3. by integrating the internal structure and the external structure of the servo driver, the protection grade of the product is improved, the service life of the product is prolonged, and the adaptability to the environment is improved;

4. through the coaxial integration of the motor oil pump, the integral mechanical inertia of the servo system is reduced (by 6-10%), so that the control precision of the system is improved, and the following performance of the system to instructions is improved;

5. through the coaxial integration of the motor oil pump, structural elements are reduced, the overall structure is simplified, and the sealing degree of the system is improved, so that the overall operation noise of the system is reduced (by 5-10 dB, the lowest noise is about 68 dB);

6. through the coaxial integration of the motor oil pump, the system stability is improved, the pressure fluctuation (the pressure fluctuation is within plus or minus 0.5bar) in the control process is reduced, the output peak current of the servo driver is reduced, and the service life and the stability of the servo driver are improved;

7. by coaxially integrating the motor oil pump, the mechanical inertia is reduced, and the response speed of the system is improved;

8. by integrating the motor, the oil pump and the servo driver, the whole configuration, technical support and service of the system are provided by packaging of a supplier, so that the efficiency of troubleshooting of a final user is improved;

9. the communication port of the servo driver is used for communicating with the outside, so that the function of the Internet of things is realized, and the remote or on-site parameter debugging of a client and the running condition of a monitoring system are facilitated;

10. through the heat dissipation design of motor housing, the radiating efficiency and the wholeness of motor and driver are improved. The design of the motor shell is suitable for the processing method of the aluminum profile, which is beneficial to batch production, reduces the manufacturing cost and improves the consistency of products; the size of the system can be further reduced by using the liquid-cooled radiating motor shell, and the energy density of the system is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

Fig. 1 is an overall structural diagram of an oil pump coaxial servo system of an external leakage type motor according to some embodiments of the present invention.

Fig. 2 is a plan view of a liquid-cooled heat dissipation structure of a motor housing of an external leakage type motor oil pump coaxial servo system according to some embodiments of the present invention.

Fig. 3 is a left side view of a liquid-cooled heat dissipation structure of a motor housing of an external leakage type motor oil pump coaxial servo system according to some embodiments of the present invention.

Fig. 4 is a plan view of an air-cooled heat dissipation structure of a motor housing of a coaxial servo system of an oil pump of an external leakage motor according to some embodiments of the present invention.

Fig. 5 is a left side view of an air-cooled heat dissipation structure of a motor housing of a coaxial servo system of an oil pump of an external leakage motor according to some embodiments of the present invention.

Fig. 6 is an internal structure view of a flow divider of a coaxial servo system of an oil pump of an electric leakage machine according to some embodiments of the present invention.

In the figure: 1. an external oil leakage port, 2, a rear pump shell, 3, a front pump shell, 4, an oil outlet flange, 5, a pressure sensor, 6, a first sliding bearing, 7, a framework oil seal, 8, an oil pump motor shaft, 9, a motor shell, 10, a motor body, 11, a motor encoder, 12, a first cooling fan, 13, a power module circuit board, 14, a driver component, 15, a second cooling fan, 16, a main control circuit board, 17, a communication port, 18, a one-way exhaust valve, 19, an aviation plug, 20, a second sliding bearing, 21, a servo driver, 22, a brake resistor, 23, a shunt valve, 24, a cooling liquid guide groove, 25, a liquid cooling motor shell, 26, a liquid cooling motor front end cover, 27, a fixing screw, 28, a motor outlet box, 29, a motor body installation cavity, 30, a liquid inlet, 31, a liquid outlet, 32, a liquid cooling motor rear end cover, 33 and a servo driver cooling step, 34. air cooling radiating fins 35, an air cooling motor shell 36, a wire outlet 37, an air cooling motor rear end cover 38, an air cooling motor front end cover 39 and a motor fan shell.

Detailed Description

The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1, the leakage type motor oil pump coaxial servo system in the present embodiment includes a motor, an oil pump, a servo driver 21, a motor encoder 11 and a pressure sensor 5; the motor and the oil pump are provided with a common oil pump motor shaft 8, an oil outlet 1 is arranged on the oil pump, and the servo driver 21 is provided with a main control circuit board 16; an oil outlet flange 4 is arranged at an output port of the oil pump, the oil outlet flange 4 is used for mounting an oil pipe to an equipment system, a pressure sensor 5 is mounted on the oil outlet flange 4, and the pressure sensor 5 is used for feeding back the actual pressure of the oil outlet to a main control circuit board 16 of a servo driver 21 for pressure closed-loop control; the motor is internally provided with a motor encoder 11, and the motor encoder 11 is used for detecting the rotating speed of the motor and feeding the rotating speed back to the main control circuit board 16 of the servo driver 21.

Specifically, the external oil leakage port 1 is used in a hydraulic oil path system with good sealing performance, when a long-time static oil pump pressure maintaining working condition is performed, a certain amount of leakage is performed by adding a passage of the external oil leakage port 1 of the oil pump, so that high-temperature/high-pressure hydraulic oil in the oil pump can be released/supplemented with new hydraulic oil, the internal temperature of the oil pump is reduced/the service life of the oil pump is prolonged, the sufficient external leakage amount can improve the stability and balance degree of internal accessories, reduce the swing of the internal accessories in the operation process and prolong the service life of the oil pump; because the whole process needs the matching of the machining precision and the fitting tolerance, the machining precision, the matching difficulty and the assembling difficulty can be reduced by using an outward leakage method, and the manufacturing cost is directly reduced.

In addition, the oil pump motor shaft 8 is a one-time cutting cylindrical grinding finish machining, the whole concentricity and the verticality of the shaft are guaranteed, the motor and the oil pump can keep high concentricity and verticality, the service life of the oil pump is guaranteed, meanwhile, the noise of the oil pump in operation is lower, the total length of the system is shortened, and the energy density of the system is higher.

It should be noted that, although the function of the oil outlet 1 can be eliminated by improving the machining accuracy and the matching degree of the oil pump fitting, the machining cost and the assembly cost are increased, and the requirement on the quality of the hydraulic oil of a customer is relatively strict.

The technical effect that this embodiment reaches does: by integrating the oil pump, the motor and the servo driver, the overall volume of the system is effectively reduced, the energy density of the system is improved, and the use cost and the maintenance cost of a user are reduced; by increasing the leakage function of the oil pump, the service life of the oil pump is prolonged, the oil pressure output is stabilized, and the manufacturing cost and difficulty are reduced; by integrating the internal structure and the external structure of the servo driver, the protection grade of the product is improved, the service life of the product is prolonged, and the adaptability to the environment is improved; through the coaxial integration of the motor oil pump, the integral mechanical inertia of the servo system is reduced (by 6-10%), so that the control precision of the system is improved, and the following performance of the system to instructions is improved; through the coaxial integration of the motor oil pump, structural elements are reduced, the overall structure is simplified, and the sealing degree of the system is improved, so that the overall operation noise of the system is reduced (by 5-10 dB, the lowest noise is about 68 dB); through the coaxial integration of the motor oil pump, the system stability is improved, the pressure fluctuation (the pressure fluctuation is within plus or minus 0.5bar) in the control process is reduced, the output peak current of the servo driver is reduced, and the service life and the stability of the servo driver are improved; by coaxially integrating the motor oil pump, the mechanical inertia is reduced, and the response speed of the system is improved; by integrating the motor, the oil pump and the servo driver, the whole configuration, technical support and service of the system are provided by packaging of one supplier, and the efficiency of troubleshooting of the end user is improved.

Example 2

As shown in fig. 1, the leakage type motor oil pump coaxial servo system in this embodiment includes all the technical features in embodiment 1, in addition, the motor further includes a motor housing 9 and a motor main body 10, the motor housing 9 is sleeved on the outer peripheral side of the motor main body 10, and the motor housing 9 is composed of a motor front end cover, an aluminum profile heat sink and a motor rear cover; the motor body 10 is composed of a motor shaft, a rotor and a stator; the motor encoder 11 is independently installed on the motor rear cover.

Optionally, the cooling device further includes a first cooling fan 12, the first cooling fan 12 is disposed in the motor housing 9, and the first cooling fan 12 is configured to cool the motor housing 9.

The beneficial effects in this embodiment are: the heat dissipation efficiency and the integrity of the motor and the driver are improved through the heat dissipation design formed by the first heat dissipation fan 12 of the motor shell. The design of the motor shell is suitable for the processing method of the aluminum profile, which is beneficial to batch production, reduces the manufacturing cost and improves the consistency of products; the size of the system can be further reduced by using the liquid-cooled radiating motor shell, and the energy density of the system is improved.

Example 3

As shown in fig. 1, the coaxial servo system of the oil pump of the electric leakage motor in the present embodiment includes all the technical features of embodiment 2, in addition, the oil pump further includes a rear pump casing 2 and a front pump casing 3, and the rear pump casing 2, the front pump casing 3 and the internal fittings of the oil pump are assembled to form the oil pump; the front pump shell 3 is provided with an oil guide groove for prompting the fault of an oil pump to customers and preventing the damage of leaked hydraulic oil to the motor; the rear pump shell 2 and the motor main body 10 are assembled together through an oil pump motor shaft 8, and the middle of the rear pump shell 2 is fixed through a spigot of the motor main body 10; the outer oil leakage port 1 is arranged on the rear pump shell 2, the front pump shell 3 or the oil outlet flange 4.

Optionally, the sliding bearing further comprises a first sliding bearing 6, a second sliding bearing 20 and a framework oil seal 7; the first sliding bearing 6 and the second sliding bearing 20 are arranged inside the oil pump and used for fixing the oil pump motor shaft 8 and improving the concentricity; the framework oil seal 7 is sleeved on an oil pump motor shaft 8 and used for forming sealing inside the oil pump.

Optionally, the oil leakage device further comprises a diverter valve 23, the oil leakage port 1 is internally provided with the diverter valve 23, the diverter valve 23 is used for connecting an oil pipe to an oil tank, and the diverter valve 23 is internally provided with a plurality of through pores; the oil pressure of the oil outlet 1 is dispersed through the plurality of pores, so that partial pressure leakage is realized, and the noise of the oil outlet 1 in the oil discharging process is reduced.

Example 4

As shown in fig. 1, the leakage type motor oil pump coaxial servo system in this embodiment includes all the technical features of embodiment 3, and in addition, further includes a power module circuit board 13 and a driver assembly 14; the power module circuit board 13 is used for controlling the motor and related direct current power supply conversion and alternating current power supply conversion according to the instruction of the main control circuit board 16; the driver assembly 14 is used for matching with the power module circuit board 13 of the servo driver 21 to perform power supply conversion; the main control circuit board 16 is provided with a main chip for collecting signals of the pressure sensor 5, signals of the motor encoder 11 and instructions and signals of an upper computer, so that closed-loop control of pressure and flow is performed, and the main control circuit board 16 is electrically connected with the power module circuit board 13 to control the operation of the motor.

Optionally, a second heat dissipation fan 15 and a one-way exhaust valve 18 are further included; the second heat dissipation fan 15 is used for forcibly circulating air inside the servo driver 21, and the second heat dissipation fan 15 is also used for dissipating heat of a chip, an electrolytic capacitor and a related power tube inside the servo driver 21; the one-way exhaust valves 18 with the same direction are installed on two sides of the servo driver 21, each one-way exhaust valve 18 is provided with a filter screen, one-way exhaust valve 18 sucks air outwards, the other one-way exhaust valve 18 exhausts air outwards, and the air temperature and the air pressure of the external environment are automatically adjusted according to the air temperature and the air pressure in the servo driver 21.

Example 5

As shown in fig. 1, the coaxial servo system of the oil pump of the external leakage type electric motor in the present embodiment includes all the technical features of embodiment 4, and in addition, includes a communication port 17, an aviation plug 19 and a brake resistor 22; the communication port 17 is used for the main control circuit board 16 to communicate the running data and setting parameters of the relevant driver to the outside, the communication port 17 supports the operator or the handheld panel to input parameters, the communication port 17 is used for connecting a computer to read the running data and the setting parameters, the communication port 17 supports a Bluetooth module, a WiFi module and an industrial 4.0 relevant Internet of things communication module, and the communication port 17 is provided with a rubber plug and is used for realizing the protection level of IP 54; the aviation plug 19 is used for electrically connecting the butting pressure sensor 5 and the main control circuit board 16, and the aviation plug 19 has the characteristics of water resistance and dust resistance and is used for realizing the IP54 protection grade of the system; a brake resistor 22 is mounted outside the motor housing 9 for coordinating the control effect of the servo driver 21.

The beneficial effects in this embodiment are: the communication port of the servo driver is used for communicating with the outside, so that the function of the Internet of things is realized, and the remote or on-site parameter debugging of a client and the running condition of a monitoring system are facilitated.

Example 6

The coaxial servo system of the oil pump of the external leakage type motor in the embodiment comprises all the technical characteristics in the embodiment 5, and in addition, the motor shell 9 is a liquid cooling motor shell 25 or an air cooling motor shell 35;

as shown in fig. 2 and 3, when the motor housing 9 is a liquid-cooled motor housing 25, a cooling liquid guiding groove 24 is formed in the liquid-cooled motor housing 25, the cooling liquid guiding groove 24 is used for guiding cooling liquid to flow in the motor housing 9 according to a preset direction, and is used for dissipating heat of the motor body 10, a motor body mounting cavity 29 is formed in the liquid-cooled motor housing 25, the motor body mounting cavity 29 is used for mounting the motor body 10, a liquid inlet 30 and a liquid outlet 31 are formed in a side wall of the liquid-cooled motor housing 25, and the liquid inlet 30 and the liquid outlet 31 are used for guiding circulating cooling liquid into the liquid-cooled motor housing 25, so as to take away system heat; the liquid cooling motor shell 25 is also provided with a liquid cooling motor front end cover 26, a liquid cooling motor rear end cover 32, a motor outlet box 28 and a fixing screw 27 which jointly form a liquid cooling heat dissipation structure of the motor, wherein the internal wiring of the motor extends out of the motor main body 10 and is led out of the liquid cooling motor rear end cover 32 to the servo driver 21;

as shown in fig. 4, 5 and 6, when the motor housing 9 is an air-cooled motor housing 35, a servo driver heat dissipation step 33 is disposed outside the air-cooled motor housing 35, and the servo driver heat dissipation step 33 is used for butting against the power module circuit board 13 in the servo driver 21 and transferring heat of the power module circuit board 13 into the air-cooled motor housing 35; the air-cooled motor shell 35 is further provided with an air-cooled radiating fin 34, an air-cooled motor rear end cover 37, an air-cooled motor front end cover 38 and a motor fan shell 39, the air-cooled radiating fin 34 enlarges the radiating area of the motor shell 9 according to different motor powers and changes in length and volume, the air-cooled motor rear end cover 37 is used for motor outgoing lines, the motor encoder 11 is installed and is in butt joint with the first radiating fan 12, the air-cooled motor front end cover 38 is used for motor outgoing shafts and butt joint oil pump installation spigots, the motor fan shell 39 is used for installing and protecting the first radiating fan 12, a wire outlet 36 is formed in the air-cooled motor rear end cover 37, and the wire outlet 36 is used for connecting wires inside the motor to the servo.

Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.

In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.

Claims

1. An oil pump coaxial servo system of an external leakage type motor is characterized by comprising a motor, an oil pump, a servo driver (21), a motor encoder (11) and a pressure sensor (5); the motor and the oil pump are provided with a common oil pump motor shaft (8), an oil outlet (1) is formed in the oil pump, and the servo driver (21) is provided with a main control circuit board (16); an oil outlet flange (4) is arranged at an output port of the oil pump, the pressure sensor (5) is mounted on the oil outlet flange (4), and the pressure sensor (5) is used for feeding back actual pressure of the oil outlet to the main control circuit board (16) of the servo driver (21) for pressure closed-loop control; the motor is internally provided with the motor encoder (11), and the motor encoder (11) is used for detecting the rotating speed of the motor and feeding back the rotating speed to the main control circuit board (16) of the servo driver (21).

2. The oil pump coaxial servo system of the external leakage type motor as claimed in claim 1, wherein the motor further comprises a motor housing (9) and a motor main body (10), the motor housing (9) is sleeved on the outer peripheral side of the motor main body (10), and the motor housing (9) is composed of a motor front end cover, an aluminum profile heat sink and a motor rear cover; the motor main body (10) consists of a motor shaft, a rotor and a stator; the motor encoder (11) is independently arranged on the motor rear cover.

3. The leakage motor oil pump coaxial servo system of claim 2, further comprising a first heat dissipation fan (12), wherein the first heat dissipation fan (12) is disposed in the motor housing (9), and the first heat dissipation fan (12) is used for cooling the motor housing (9).

4. The coaxial servo system of the oil pump of the electric leakage type motor according to claim 3, characterized in that the oil pump further comprises a rear pump shell (2) and a front pump shell (3), and the rear pump shell (2), the front pump shell (3) and the internal fittings of the oil pump are assembled to form the oil pump; the front pump shell (3) is provided with an oil guide groove for prompting the fault of the oil pump to customers and preventing the damage of leaked hydraulic oil to the motor; the rear pump shell (2) and the motor main body (10) are assembled together through the oil pump motor shaft (8), and the middle of the rear pump shell (2) is fixed through a spigot of the motor main body (10); the oil outlet (1) is arranged on the rear pump shell (2), the front pump shell (3) or the oil outlet flange (4).

5. The leakage motor oil pump coaxial servo system of claim 4, further comprising a first sliding bearing (6), a second sliding bearing (20) and a skeleton oil seal (7); the first sliding bearing (6) and the second sliding bearing (20) are arranged inside the oil pump and used for fixing the oil pump motor shaft (8) and improving the concentricity; the framework oil seal (7) is sleeved on the oil pump motor shaft (8) and used for forming the sealing inside the oil pump.

6. The leaky motor oil pump coaxial servo system as claimed in claim 5, further comprising a power module circuit board (13) and a driver assembly (14); the power module circuit board (13) is used for controlling the motor and related direct current power supply conversion and alternating current power supply conversion according to the instruction of the main control circuit board (16); the driver assembly (14) is used for matching with the power module circuit board (13) of the servo driver (21) to carry out power supply conversion; the main control circuit board (16) is provided with a main chip for collecting signals of the pressure sensor (5), signals of the motor encoder (11) and instructions and signals of an upper computer, so that closed-loop control of pressure flow is performed, and the main control circuit board (16) is electrically connected with the power module circuit board (13) to control the operation of the motor.

7. The oil pump coaxial servo system of the electric leakage motor as claimed in claim 6, further comprising a second heat dissipation fan (15) and a one-way exhaust valve (18); the second heat dissipation fan (15) is used for forcibly circulating air inside the servo driver (21), and the second heat dissipation fan (15) is also used for dissipating heat of a chip, an electrolytic capacitor and a related power tube inside the servo driver (21); the servo driver (21) is provided with one-way exhaust valves (18) in the same direction on two sides, and each one-way exhaust valve (18) is provided with a filter screen.

8. The leakage motor oil pump coaxial servo system of claim 7, further comprising a communication port (17), an aviation plug (19) and a brake resistor (22); the communication port (17) is used for the main control circuit board (16) to communicate the running data and setting parameters of the relevant driver to the outside, the communication port (17) supports an operator or a handheld panel to input parameters, the communication port (17) is used for connecting a computer to read the running data and set parameters, the communication port (17) supports a Bluetooth module, a WiFi module and an industrial 4.0 relevant Internet of things communication module, and the communication port (17) is provided with a rubber plug; the aviation plug (19) is used for electrically connecting the pressure sensor (5) and the main control circuit board (16) in a butt joint mode; the brake resistor (22) is arranged outside the motor shell (9) and is used for matching the control effect of the servo driver (21).

9. The oil pump coaxial servo system of the external leakage type motor as claimed in claim 8, further comprising a flow divider (23), wherein the flow divider (23) is disposed in the external leakage port (1), the flow divider (23) is used for connecting the oil pipe to the oil tank, and the flow divider (23) has a plurality of through pores therein; through a plurality of the pore dispersion the oil pressure of leaking hydraulic fluid port (1) realizes the partial pressure and leaks for reduce leak hydraulic fluid port (1) is at the noise of oil extraction process.

10. The external leakage motor oil pump coaxial servo system of claim 9, wherein the motor housing (9) is a liquid cooled motor housing (25) or an air cooled motor housing (35);

when the motor shell (9) is the liquid-cooled motor shell (25), a cooling liquid diversion trench (24) is arranged on the liquid-cooled motor shell (25), the cooling liquid diversion trench (24) is used for guiding cooling liquid to flow in the motor shell (9) according to a preset direction and used for dissipating heat of the motor body (10), a motor body installation cavity (29) is arranged in the liquid-cooled motor shell (25), the motor body installation cavity (29) is used for installing the motor body (10), a liquid inlet (30) and a liquid outlet (31) are arranged on the side wall of the liquid-cooled motor shell (25), and the liquid inlet (30) and the liquid outlet (31) are used for guiding circulating cooling liquid into the liquid-cooled motor shell (25) so as to take away system heat; the liquid cooling motor shell (25) is further provided with a liquid cooling motor front end cover (26), a liquid cooling motor rear end cover (32), a motor outlet box (28) and a fixing screw (27) which jointly form a liquid cooling heat dissipation structure of the motor, the internal wiring of the motor extends out of the motor main body (10), and is led out of the liquid cooling motor rear end cover (32) to the servo driver (21);

when the motor shell (9) is the air-cooled motor shell (35), a servo driver heat dissipation step (33) is arranged on the outer side of the air-cooled motor shell (35), the servo driver heat dissipation step (33) is used for butting the power module circuit board (13) in the servo driver (21) and transferring heat of the power module circuit board (13) to the air-cooled motor shell (35); the air-cooled motor shell (35) is also provided with an air-cooled radiating fin (34), an air-cooled motor rear end cover (37), an air-cooled motor front end cover (38) and a motor fan shell (39), the air cooling radiating fins (34) expand the radiating area of the motor shell (9) according to different motor powers, length and volume changes, the rear end cover (37) of the air-cooled motor is used for leading out the motor wire, installing the motor encoder (11) and butting the first cooling fan (12), the front end cover (38) of the air-cooled motor is used for the output shaft of the motor and butt joint with the mounting spigot of the oil pump, the motor fan housing (39) is used for installing and protecting the first heat radiation fan (12), an outlet (36) is formed in the rear end cover (37) of the air cooling motor, and the outlet (36) is used for connecting the internal wiring of the motor to the servo driver (21).