CN111306118A - Active flow distribution type electromagnetic direct-drive hydrostatic actuating system - Google Patents
Active flow distribution type electromagnetic direct-drive hydrostatic actuating system Download PDFInfo
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- CN111306118A CN111306118A CN202010338446.0A CN202010338446A CN111306118A CN 111306118 A CN111306118 A CN 111306118A CN 202010338446 A CN202010338446 A CN 202010338446A CN 111306118 A CN111306118 A CN 111306118A
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- linear motor
- hydraulic cylinder
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- plunger pump
- control valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/027—Check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/18—Combined units comprising both motor and pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B9/00—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member
- F15B9/02—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type
- F15B9/08—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor
- F15B9/09—Servomotors with follow-up action, e.g. obtained by feed-back control, i.e. in which the position of the actuated member conforms with that of the controlling member with servomotors of the reciprocatable or oscillatable type controlled by valves affecting the fluid feed or the fluid outlet of the servomotor with electrical control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/044—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by electrically-controlled means, e.g. solenoids, torque-motors
- F15B2013/0448—Actuation by solenoid and permanent magnet
Abstract
The invention relates to an active flow distribution type electromagnetic direct-drive hydrostatic actuating system, which comprises a linear motor, a plunger pump, an active control valve set, a hydraulic cylinder, a displacement sensor and a controller, and is characterized in that: the linear motor is adopted to directly drive the plunger pump, the volumes of working cavities at two ends of a piston of the plunger pump are changed simultaneously, and the opening and closing of a high-speed switch valve in the active control valve bank are combined to realize the bidirectional transmission of hydraulic oil of the plunger pump, so that the bidirectional movement of two hydraulic cylinder pistons is realized; the controller collects the displacement of the hydraulic cylinder and the linear motor through the displacement sensor, and controls the linear motor and the active control valve group in real time: the flow direction of hydraulic oil in the system is controlled by controlling the movement frequency of the linear motor and the flow rate of the hydraulic oil in the amplitude control system and controlling the opening and closing phase combination of the active control valve group, so that the movement of the hydraulic cylinder is controlled; the invention integrates the technical advantages of electric control direct drive and pump control direct drive, has the advantages of simple structure, high efficiency, good dynamic performance and the like, and has great prospect.
Description
Technical Field
The invention relates to an active flow distribution type electromagnetic direct-drive hydrostatic actuating system, and belongs to the technical field of electro-hydraulic servo control.
Background
An Electro Hydrostatic Actuator (EHA) is a volume control system composed of a motor, a pump, an Actuator and the like, and is a highly integrated local hydraulic drive system. Different from the traditional hydraulic system, the hydraulic system controls the driving unit through an electric signal, directly drives the pump, controls the pressure and flow output by the pump, and realizes accurate control on the displacement of the driving element. Therefore, the electric hydrostatic actuating system not only has the advantages of high dynamic stability and high response speed of the traditional hydraulic system, but also effectively reduces the volume and the mass, realizes modularization and distribution, improves the reliability and the maintainability of a driving system, and is widely applied to the fields of industry, such as aviation, aerospace, robots, automobiles and the like.
The electro-hydrostatic actuating system mostly adopts a composition mode of combining a rotating motor and a hydraulic pump, wherein the technologies of a plunger pump, a gear pump and the rotating motor are mature. It has its own problems (reliability and lifetime, system dynamics, and redundancy configuration difficulties). Scholars such as scorch summer have proposed electro-hydrostatic actuation systems that employ linear motors as drive units. Compared with an electro-hydrostatic actuating system using a rotating motor, the electro-hydrostatic actuating system has a simpler structure because a motion conversion mechanism is not required, and the linear motor has higher response speed and higher control precision.
At the present stage, the electric hydrostatic actuating system mostly adopts a valve to control the actuating system to work, and has the advantages of high response speed, high control precision and the like, but the power loss is large; the non-direct-drive pump control or rotary motor pump control hydrostatic actuating system has high working efficiency, but has low motor response speed, complex structure, large rotation inertia and higher production cost of the motor meeting the pressure control precision.
The invention provides an active flow distribution type electromagnetic direct-drive hydrostatic actuating system, which integrates the technical advantages of electric control direct drive and pump control direct drive, adopts a high-power-density moving-coil linear motor to directly drive a hydraulic pump piston to reciprocate, does not need a motion conversion mechanism, shortens a power transmission line, effectively improves the working efficiency, and has good energy-saving effect; the active one-way valve of the high-response energy-saving electromagnet is matched to realize high-efficiency output flow size and direction control, and under the flow distribution control of the one-way valve group, oil suction and discharge are respectively realized in two cavities in the process of bidirectional movement of the piston, so that the power density is effectively improved; the linear motor is used for controlling the action of the asymmetric hydraulic cylinder, so that the response is quicker and the dynamic performance is good.
Disclosure of Invention
The active flow distribution type electromagnetic direct-drive hydrostatic actuating system is designed to integrate the technical advantages of electric control direct drive and pump control direct drive, and a high-power-density moving-coil linear motor is adopted to directly drive a hydraulic pump piston to reciprocate, so that a motion conversion mechanism is not needed, the power transmission route is shortened, the working efficiency is effectively improved, and the energy-saving effect is good; the active one-way valve of the high-response energy-saving electromagnet is matched to realize high-efficiency output flow size and direction control, and under the flow distribution control of the one-way valve group, oil suction and discharge are respectively realized in two cavities in the process of bidirectional movement of the piston, so that the power density is effectively improved; the linear motor is used for controlling the action of the asymmetric hydraulic cylinder, so that the response is quicker and the dynamic performance is good.
The invention discloses an active flow distribution type electromagnetic direct-drive hydrostatic actuating system which comprises a linear motor (1), a plunger pump (2), an active check valve control valve group (3), an energy accumulator (4), an overflow valve (5), a hydraulic cylinder (6), a hydraulic cylinder displacement sensor (7), a controller (8) and a linear motor displacement sensor (9). The rotor of the linear motor (1) directly drives the piston of the plunger pump (2) to enable the volumes of two working cavities of the plunger pump (2) to be changed simultaneously and to be increased and reduced alternately, each working cavity of the plunger pump (2) is respectively connected with two cavities of the hydraulic cylinder (6) through two driving one-way valves in the driving one-way valve control valve set (3), and the energy accumulator (4) is a low-pressure energy accumulator and is respectively connected with two cavities of the hydraulic cylinder (6) through two one-way valves; the inlet and the outlet of the overflow valve (5) are respectively connected with two cavities of the hydraulic cylinder (6), and pipelines connected with the inlets of the two overflow valves (6) are different; the active one-way valves in the active one-way valve control valve group (3) belong to normally closed high-speed switch electromagnetic valves, in the reciprocating motion process of a piston of the plunger pump (2), only one of the active one-way valves connected with the same cavity of the hydraulic cylinder (6) is in an open state, only one of the active one-way valves connected with the same working cavity of the plunger pump (2) is in an open state, namely continuous one-way fluid output is generated, and the piston of the hydraulic cylinder (6) moves in a one-way mode; when the piston of the hydraulic cylinder (6) needs to move in a reversing way, the opening and closing phases of two driving one-way valves connected with the same working cavity of the plunger pump (2) are set and exchanged.
The active flow distribution type electromagnetic direct-drive hydrostatic actuating system is characterized in that: the Halbach permanent magnet array is adopted by the linear motor (1) to improve the air gap flux density, and a rotor of the linear motor (1) is of a moving coil type or a moving magnet type.
The active flow distribution type electromagnetic direct-drive hydrostatic actuating system is characterized in that: the controller (8) respectively detects the output displacement of the hydraulic cylinder (6) and the linear motor (1) through a hydraulic cylinder displacement sensor (7) and a linear motor displacement sensor (9), and outputs a control signal of the linear motor (1) and a control signal of the active check valve control valve group (3).
The active flow distribution type electromagnetic direct-drive hydrostatic actuating system is characterized in that the control method comprises the following steps:
s1, the controller (8) controls a cable to input electric energy to the linear motor (1) and the active check valve control valve group (3), the rotor of the linear motor (1) moves, the active check valve control valve group (3) is switched to a forward station (the linear motor moves forward, the active check valves 3.2 and 3.3 are opened, the linear motor moves in the reverse direction, and the active check valves 3.1 and 3.4 are opened);
s2, a rotor of the linear motor (1) directly drives a piston of the plunger pump (2) to reciprocate, the plunger pump sucks hydraulic oil on one side of the hydraulic cylinder (6) and pumps the hydraulic oil into the other side of the hydraulic cylinder (6), and a piston rod of the hydraulic cylinder (6) moves in the positive direction;
s3, the controller (8) detects the working condition of the linear motor (1) according to the linear motor displacement sensor (9), and controls the displacement and the speed of the piston rod of the hydraulic cylinder (7) by controlling the motion frequency and the amplitude of the linear motor (1);
s4, the active check valve control valve group (3) is switched to a reverse station (the opening and closing phases of two active check valves connected with the same working cavity of the plunger pump (2) are set and exchanged, the active check valves 3.1 and 3.4 are opened when the linear motor moves forward, and the active check valves 3.2 and 3.3 are opened when the linear motor moves reversely); the piston rod of the hydraulic cylinder (7) moves reversely.
According to the active flow distribution type electromagnetic direct-drive hydrostatic actuating system, the controller carries out energy transfer through the cable, the linear motor drives the plunger pump to move, the action of the asymmetric hydraulic cylinder is controlled through the linear motor and the active one-way valve control valve group, the sensor detects the output displacement of the linear motor and the asymmetric hydraulic cylinder, a feedback signal is generated and fed back to the controller, and closed-loop control is formed.
According to the active flow distribution type electromagnetic direct-drive hydrostatic actuating system, the high-power-density moving-coil linear motor is adopted to directly drive the hydraulic pump piston to reciprocate, a motion conversion mechanism is not needed, the power transmission route is shortened, and the active flow distribution type electromagnetic direct-drive hydrostatic actuating system has the advantages of being simple in structure, rapid in response, high in working efficiency, good in energy-saving effect and the like.
According to the active flow distribution type electromagnetic direct-drive hydrostatic actuating system, the active one-way valve of the high-response energy-saving electromagnet is applied, high-efficiency output flow size and direction control is realized, oil suction and discharge are respectively realized in two cavities of the piston in the two-way movement process under the flow distribution control of the one-way valve group, and the power density is effectively improved.
The active flow distribution type electromagnetic direct-drive hydrostatic actuating system disclosed by the invention integrates the technical advantages of electric control direct drive and pump control direct drive, has the advantages of simple structure, high efficiency, good dynamic performance and the like, and brings huge economic benefits after being put into industrial application.
Drawings
Fig. 1 shows a flow direction of a linear motor of an active flow distribution type electromagnetic direct-drive hydrostatic actuating system according to an embodiment of the present invention when the linear motor moves rightward, a first active check valve and a fourth active check valve are opened, and a piston rod of an asymmetric hydraulic cylinder moves forward.
Fig. 2 shows a flow direction of a hydraulic cylinder piston rod of an active flow distribution type electromagnetic direct-drive hydrostatic actuating system according to an embodiment of the present invention when the hydraulic cylinder piston rod moves in a forward direction.
Fig. 3 shows a flow direction of a hydraulic cylinder piston rod of an active flow distribution type electromagnetic direct-drive hydrostatic actuating system according to an embodiment of the present invention when the hydraulic cylinder piston rod moves in a reverse direction.
Fig. 4 is a structural diagram of an active flow distribution type electromagnetic direct-drive hydrostatic actuating system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 4, an active flow distribution type electromagnetic direct-drive hydrostatic actuating system comprises a linear motor (1), a plunger pump (2), an active check valve control valve group (3), an energy accumulator (4), an overflow valve (5), a hydraulic cylinder (6), a hydraulic cylinder displacement sensor (7), a controller (8) and a linear motor displacement sensor (9). The rotor of the linear motor (1) directly drives the piston of the plunger pump (2) to enable the volumes of two working cavities of the plunger pump (2) to be changed simultaneously and to be increased and reduced alternately, each working cavity of the plunger pump (2) is respectively connected with two cavities of the hydraulic cylinder (6) through two driving one-way valves in the driving one-way valve control valve set (3), and the energy accumulator (4) is a low-pressure energy accumulator and is respectively connected with two cavities of the hydraulic cylinder (6) through two one-way valves; the inlet and the outlet of the overflow valve (5) are respectively connected with two cavities of the hydraulic cylinder (6), and pipelines connected with the inlets of the two overflow valves (6) are different; the active one-way valves in the active one-way valve control valve group (3) belong to normally closed high-speed switch electromagnetic valves, in the reciprocating motion process of a piston of the plunger pump (2), only one of the active one-way valves connected with the same cavity of the hydraulic cylinder (6) is in an open state, only one of the active one-way valves connected with the same working cavity of the plunger pump (2) is in an open state, namely continuous one-way fluid output is generated, and the piston of the hydraulic cylinder (6) moves in a one-way mode; when the piston of the hydraulic cylinder (6) needs to move in a reversing way, the opening settings of two driving one-way valves connected with the same working cavity of the plunger pump (2) are changed.
The Halbach permanent magnet array is adopted by the linear motor (1) to improve the air gap flux density, and a rotor of the linear motor (1) is of a moving coil type or a moving magnet type.
The controller (8) respectively detects the output displacement of the hydraulic cylinder (6) and the linear motor (1) through a hydraulic cylinder displacement sensor (7) and a linear motor displacement sensor (9), and outputs a control signal of the linear motor (1) and a control signal of the active check valve control valve group (3).
The control method of the active flow distribution type electromagnetic direct-drive hydrostatic actuating system comprises the following steps:
s1, the controller (8) controls a cable to input electric energy to the linear motor (1) and the active check valve control valve group (3), the rotor of the linear motor (1) moves, the active check valve control valve group (3) is switched to a forward station (the linear motor moves forward, the active check valves 3.2 and 3.3 are opened, the linear motor moves in the reverse direction, and the active check valves 3.1 and 3.4 are opened);
s2, a rotor of the linear motor (1) directly drives a piston of the plunger pump (2) to reciprocate, the plunger pump sucks hydraulic oil on one side of the hydraulic cylinder (6) and pumps the hydraulic oil into the other side of the hydraulic cylinder (6), and a piston rod of the hydraulic cylinder (6) moves in the positive direction;
s3, the controller (8) detects the working condition of the linear motor (1) according to the linear motor displacement sensor (9), and controls the displacement and the speed of the piston rod of the hydraulic cylinder (7) by controlling the motion frequency and the amplitude of the linear motor (1);
s4, the active check valve control valve group (3) is switched to a reverse station (the opening and closing phases of two active check valves connected with the same working cavity of the plunger pump (2) are set and exchanged, the active check valves 3.1 and 3.4 are opened when the linear motor moves forward, and the active check valves 3.2 and 3.3 are opened when the linear motor moves reversely); the piston rod of the hydraulic cylinder (7) moves reversely.
More specifically, as shown in fig. 1, the active flow distribution type electromagnetic direct-drive hydrostatic actuating system comprises a linear motor (1), a plunger pump (2), an active check valve control valve group (3), an energy accumulator (4), an overflow valve (5), a hydraulic cylinder (6), a hydraulic cylinder displacement sensor (7), a controller (8) and a linear motor displacement sensor (9). The rotor of the linear motor (1) directly drives the piston of the plunger pump (2) to enable the volumes of two working cavities of the plunger pump (2) to be changed simultaneously and to be increased and reduced alternately, each working cavity of the plunger pump (2) is respectively connected with two cavities of the hydraulic cylinder (6) through two driving one-way valves in the driving one-way valve control valve set (3), and the energy accumulator (4) is a low-pressure energy accumulator and is respectively connected with two cavities of the hydraulic cylinder (6) through two one-way valves; the inlet and the outlet of the overflow valve (5) are respectively connected with two cavities of the hydraulic cylinder (6), and pipelines connected with the inlets of the two overflow valves (6) are different; the active one-way valves in the active one-way valve control valve group (3) belong to normally closed high-speed switch electromagnetic valves, in the reciprocating motion process of a piston of the plunger pump (2), only one of the active one-way valves connected with the same cavity of the hydraulic cylinder (6) is in an open state, only one of the active one-way valves connected with the same working cavity of the plunger pump (2) is in an open state, namely continuous one-way fluid output is generated, and the piston of the hydraulic cylinder (6) moves in a one-way mode; when the piston of the hydraulic cylinder (6) needs to move in a reversing way, the opening settings of two driving one-way valves connected with the same working cavity of the plunger pump (2) are changed.
The Halbach permanent magnet array is adopted by the linear motor (1) to improve the air gap flux density, and a rotor of the linear motor (1) is of a moving coil type or a moving magnet type.
The controller (8) respectively detects the output displacement of the hydraulic cylinder (6) and the linear motor (1) through a hydraulic cylinder displacement sensor (7) and a linear motor displacement sensor (9), and outputs a control signal of the linear motor (1) and a control signal of the active check valve control valve group (3).
As shown in fig. 1, in the active flow distribution type electromagnetic direct-drive hydrostatic actuating system according to the present embodiment, the active check valve control valve set (3) includes a first active check valve (3.1), a second active check valve (3.2), a third active check valve (3.3), and a fourth active check valve (3.4); the first driving one-way valve (3.1) and the third driving one-way valve (3.3) are connected with a first compression cavity of the hydraulic pump (2) and are respectively connected with the non-load side and the load side of the hydraulic cylinder (6); the second driving one-way valve (3.2) and the driving one-way valve (3.4) are connected with the second compression cavity of the hydraulic pump and are respectively connected with the non-load side and the load side of the asymmetric hydraulic cylinder (6).
As shown in fig. 2 to 3, the control method of the active flow distribution type electromagnetic direct-drive hydrostatic actuating system according to the present embodiment includes the following steps:
the active flow distribution type electromagnetic direct-drive hydrostatic actuating system does not work: the plunger pump (2) does not work and each active one-way valve in the active one-way valve control valve group (3) is closed;
the active flow distribution type electromagnetic direct-drive hydrostatic actuating system works:
the method comprises the following steps that S1 a controller (8) controls a cable to input electric energy to a linear motor (1) and an active check valve control valve group (3), a rotor of the linear motor (1) directly drives a piston of a plunger pump (2) to reciprocate (when the linear motor (1) moves forward, a second active check valve (3.2) and a third active check valve (3.3) are opened, when the linear motor (1) moves reversely, a first active check valve (3.1) and a fourth active check valve (3.4) are opened), the plunger pump sucks hydraulic oil on the loaded side of a hydraulic cylinder (6) and pumps the hydraulic oil into the unloaded side of the hydraulic cylinder (6), and a piston rod of the hydraulic cylinder (6) moves forward;
the method comprises the following steps that S2 a controller (8) controls a cable to input electric energy to a linear motor (1) and an active check valve control valve group (3), a rotor of the linear motor (1) directly drives a piston of a plunger pump (2) to reciprocate (when the linear motor (1) moves forward, a first active check valve (3.1) and a fourth active check valve (3.4) are opened, when the linear motor (1) moves reversely, a second active check valve (3.2) and a third active check valve (3.3) are opened, the plunger pump sucks hydraulic oil on the non-load side of a hydraulic cylinder (6) and pumps the hydraulic oil into the load side of the hydraulic cylinder (6), and a piston rod of the hydraulic cylinder (6) moves reversely;
the S3 controller (8) detects the working condition of the linear motor (1) according to the linear motor displacement sensor (9), and controls the displacement and the speed of the piston rod of the hydraulic cylinder (7) by controlling the motion frequency and the amplitude of the linear motor (1);
s4 switching the active check valve control valve group (3) to a reverse station (setting and exchanging the opening and closing phases of two active check valves connected with the same working cavity of the plunger pump (2), opening the active check valves 3.1 and 3.4 when the linear motor moves forward, and opening the active check valves 3.2 and 3.3 when the linear motor moves reversely); the piston rod of the hydraulic cylinder (7) moves reversely.
As shown in fig. 4, the active flow distribution type electromagnetic direct-drive hydrostatic actuating system comprises a linear motor (1), a plunger pump (2), an active check valve control valve set (3), an energy accumulator (4), an overflow valve (5), a hydraulic cylinder (6), a hydraulic cylinder displacement sensor (7), a controller (8) and a linear motor displacement sensor (9). The linear motor (1) is fixedly connected with the plunger pump (2); the active check valve control valve group (3) is arranged above the linear motor (1) and the plunger pump (2); the energy accumulator (4) is arranged on the right side of the linear motor (1) and the plunger pump (2); the hydraulic cylinder (6) is arranged below the linear motor and the plunger pump, and the linear motor (1) and the hydraulic cylinder (6) are respectively connected with the displacement sensor.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (4)
1. An active flow distribution type electromagnetic direct-drive hydrostatic actuating system is characterized by comprising a linear motor (1), a plunger pump (2), an active check valve control valve group (3), an energy accumulator (4), an overflow valve (5), a hydraulic cylinder (6), a hydraulic cylinder displacement sensor (7), a controller (8) and a linear motor displacement sensor (9); the method is characterized by comprising the following steps:
the rotor of the linear motor (1) directly drives the piston of the plunger pump (2) to enable the volumes of two working cavities of the plunger pump (2) to be changed simultaneously and to be increased and reduced alternately, each working cavity of the plunger pump (2) is respectively connected with two cavities of the hydraulic cylinder (6) through two driving one-way valves in the driving one-way valve control valve set (3), and the energy accumulator (4) is a low-pressure energy accumulator and is respectively connected with the two cavities of the hydraulic cylinder (6) through the two one-way valves; the inlet and the outlet of the overflow valve (5) are respectively connected with two cavities of the hydraulic cylinder (6), and pipelines connected with the inlets of the two overflow valves (6) are different; the active one-way valves in the active one-way valve control valve group (3) belong to normally closed high-speed switch electromagnetic valves, in the reciprocating motion process of a piston of the plunger pump (2), only one of the active one-way valves connected with the same cavity of the hydraulic cylinder (6) is in an open state, only one of the active one-way valves connected with the same working cavity of the plunger pump (2) is in an open state, namely the plunger pump (2) generates continuous one-way fluid output, and the piston of the hydraulic cylinder (6) moves in a one-way mode; when the piston of the hydraulic cylinder (6) needs to move in a reversing way, the opening and closing phases of two driving one-way valves connected with the same working cavity of the plunger pump (2) are set and exchanged.
2. The active flow distributing electromagnetic direct-drive hydrostatic actuating system as set forth in claim 1, wherein: the Halbach permanent magnet array is adopted by the linear motor (1) to improve the air gap flux density, and a rotor of the linear motor (1) is of a moving coil type or a moving magnet type.
3. The active flow distributing electromagnetic direct-drive hydrostatic actuating system as set forth in claim 1, wherein: the controller (8) respectively detects the output displacement of the hydraulic cylinder (6) and the linear motor (1) through a hydraulic cylinder displacement sensor (7) and a linear motor displacement sensor (9), and outputs a control signal of the linear motor (1) and a control signal of the active check valve control valve group (3).
4. The active flow distributing type electromagnetic direct-drive hydrostatic actuating system as claimed in claim 1, wherein the control method comprises the following steps:
s1, the controller (8) controls a cable to input electric energy to the linear motor (1) and the active check valve control valve group (3), the rotor of the linear motor (1) moves, the active check valve control valve group (3) is switched to a forward station (the linear motor moves forward, the active check valves 3.2 and 3.3 are opened, the linear motor moves in the reverse direction, and the active check valves 3.1 and 3.4 are opened);
s2, a rotor of the linear motor (1) directly drives a piston of the plunger pump (2) to reciprocate, the plunger pump sucks hydraulic oil on one side of the hydraulic cylinder (6) and pumps the hydraulic oil into the other side of the hydraulic cylinder (6), and a piston rod of the hydraulic cylinder (6) moves in the positive direction;
s3, the controller (8) detects the working condition of the linear motor (1) according to the linear motor displacement sensor (9), and controls the displacement and the speed of the piston rod of the hydraulic cylinder (7) by controlling the motion frequency and the amplitude of the linear motor (1);
s4, switching the active check valve control valve group (3) to a reverse station (setting and exchanging the opening and closing phases of two active check valves connected with the same working cavity of the plunger pump (2), wherein the active check valves 3.1 and 3.4 are opened when the linear motor moves forward, and the active check valves 3.2 and 3.3 are opened when the linear motor moves reversely); the piston rod of the hydraulic cylinder (7) moves reversely.
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| CN202010338446.0A CN111306118A (en) | 2020-04-26 | 2020-04-26 | Active flow distribution type electromagnetic direct-drive hydrostatic actuating system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734699A (en) * | 2020-07-09 | 2020-10-02 | 四川航天烽火伺服控制技术有限公司 | Electric hydrostatic actuator |
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2020
- 2020-04-26 CN CN202010338446.0A patent/CN111306118A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111734699A (en) * | 2020-07-09 | 2020-10-02 | 四川航天烽火伺服控制技术有限公司 | Electric hydrostatic actuator |
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