Electromagnetic drive based motor gear pump

Abstract

The present invention provides a motor gear pump based on electromagnetic drive, an internal meshing motor gear pump, comprising a crescent plate end cover, a gear, a slip ring, a gear ring and a magnetic pole coil; the gear ring magnetic pole coil and the gear magnetic pole coil generate a uniform magnetic field, the shell magnetic pole coil and the crescent plate magnetic pole coil generate an alternating magnetic field, the alternating magnetic field generated by the shell magnetic pole coil acts on the uniform magnetic field of the gear ring magnetic pole coil to drive the gear ring to rotate along the inner ring of the shell, and the alternating magnetic field generated by the crescent plate magnetic pole coil acts on the uniform magnetic field of the gear magnetic pole coil to drive the gear to rotate along the core shaft. The external meshing motor gear pump comprises a cover plate, a coil, an external meshing gear, a slip ring and a fixed side plate, the tooth root of the external meshing gear is provided with a rotor coil, the fixed support is provided with a stator coil, and the stator coil and the stator cover plate are arranged in an alternating manner. The present invention integrates the motor and the gear pump, relies on electromagnetic action to make the gear pump run automatically, and improves the energy transfer efficiency and power density of the gear pump and the motor.

Description

Technical Field

[0001] The invention relates to the technical field of gear pumps, and in particular to a motor gear pump based on electromagnetic drive. Background Art

[0002] The internal and external meshing gear pump relies on the volume change caused by the meshing of gears to absorb and discharge oil. At the same time, the meshing ring gear and gear in the internal and external meshing gear pump are divided into two closed chambers by a crescent plate. In the oil suction chamber, the gear and the ring gear are disengaged, and the volume of the chamber in the oil suction area increases to form a vacuum, completing the oil suction; the sucked oil is transported to the oil outlet through the closed transition chamber formed by the gear, ring gear and crescent plate; at the oil outlet, the gear and ring gear mesh with each other, compressing the high-pressure oil into the oil discharge port for discharge.

[0003] The structure of the current internal and external meshing gear pump includes a driving wheel and a driven wheel. One end of the driving wheel is connected to the motor and powered by the motor. This increases the overall structure of the gear pump on the one hand, and has disadvantages such as high noise and high energy loss on the other hand. At the same time, the motor needs a cooling fan to dissipate heat during operation, which leads to increased noise and energy consumption. The gear pump connects the motor shaft to the transmission shaft of the driving wheel through a coupling, which inevitably causes eccentricity and brings noise and vibration. In addition, the axial arrangement and connection between the motor and the gear pump will make the installation volume and mass larger, and multiple connections and coordination will reduce the energy conversion efficiency.

[0004] The present invention utilizes an electromagnetic control system to make the gears rotate automatically, greatly reducing the overall structure and maintenance cost of the gear pump. The gear speed is controlled by controlling the current in the coil, with a fast response speed, which effectively improves the working efficiency of the gear pump. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a motor gear pump based on electromagnetic drive, which is mainly achieved by respectively arranging magnetic pole coils on the housing, gear ring, crescent plate on the crescent plate end cover and gear of the internal meshing motor gear pump, arranging rotor coils on the tooth roots of the external meshing gear of the external meshing motor gear pump, and arranging stator coils on the fixed support; and completing the self-operation of the gear pump through the interaction of the uniform magnetic field and the alternating magnetic field generated by the magnetic pole coils, thereby optimizing the structure of the gear pump, improving the reliability of the working system and the working efficiency of the gear pump, and reducing the noise and energy loss of the gear pump during operation.

[0006] The present invention provides a motor gear pump based on electromagnetic drive, which includes a crescent plate end cover, a housing, a gear, a slip ring, a gear ring, a floating side plate, a cover plate and a magnetic pole coil. The first mounting end of the gear ring is connected to the first mounting end of the crescent plate end cover, the second mounting end of the gear ring is connected to the first end of the floating side plate, the second end of the floating side plate is connected to the first mounting end of the cover plate, the mounting end of the gear is connected to the first mounting end of the core shaft on the crescent plate end cover, the gear is meshed with the gear ring, the second mounting end of the crescent plate end cover is connected to the second end of the housing through an O-ring, and the O-ring at the second mounting end of the cover plate is connected to the third end of the housing. The shell, the gear ring, the crescent plate on the crescent plate end cover and the gear are respectively provided with a shell pole coil, a gear ring pole coil, a crescent plate pole coil and a gear pole coil. The gear ring pole coil and the gear pole coil generate a uniform magnetic field, and the shell pole coil and the crescent plate pole coil generate an alternating magnetic field. The alternating magnetic field generated by the shell pole coil acts on the uniform magnetic field of the gear ring pole coil to drive the gear ring to rotate along the inner ring of the shell. The alternating magnetic field generated by the crescent plate pole coil acts on the uniform magnetic field of the gear pole coil to drive the gear to rotate along the core shaft. The inner slip ring of the gear ring is fixedly connected to the mounting end of the crescent plate, and the inner slip ring of the gear is connected to the second mounting end of the core shaft.

[0007] Preferably, the crescent plate end cover, the gear, the gear ring and the floating side plate are located inside the housing.

[0008] Preferably, the axes of the floating side plate, the gear inner slip ring, the core shaft and the gear are in the same straight line, and the axes of the crescent plate end cover, the housing, the gear ring inner slip ring, the gear ring and the cover plate are in the same straight line.

[0009] Another aspect of the present invention provides an electromagnetically driven motor gear pump, which includes an outer meshing shell, a main cover plate, a stator coil, an outer meshing gear, a rotor coil, a slip ring, a stator cover plate, a shell cover plate, an outer meshing floating side plate, a rotor cover plate and a fixed side plate. The first end and the second end of the outer meshing shell are respectively provided with a fixed support and a gear shaft, the first mounting end and the second mounting end of the outer meshing shell are respectively fixedly connected to the main cover plate and the shell cover plate, the mounting end of the outer meshing gear and the rotor cover plate are respectively connected to the first mounting end and the second mounting end of the gear shaft, the tooth root of the outer meshing gear is provided with a rotor coil, the rotor coil is in contact with the rotor cover plate, the fixed support is provided with a stator coil, the stator coil and the stator cover plate are staggered, the stator cover plate is connected to the first end of the fixed side plate, the slip ring is connected to the third mounting end of the gear shaft, and the floating side plate is connected to the shell cover plate through a sealing ring.

[0010] Preferably, the fixing supports are in the shape of bosses and are evenly and symmetrically distributed along the inner wall of the outer engagement shell.

[0011] Preferably, the axes of the external meshing housing, the main cover plate, the external meshing floating side plate, the fixed side plate and the housing cover plate are on the same straight line; the axes of the external meshing gear, the rotor coil, the slip ring and the rotor cover plate are on the same straight line.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] 1. The present invention does not require an external active motor, and relies on electromagnetic action to make the gear pump run automatically, and controls the gear speed by controlling the current in the coil. It has a fast response speed and low noise, optimizes the gear pump structure, and improves the reliability of the working system and the efficiency of the oil pump.

[0014] 2. The rotor and stator pole coils in the present invention are immersed in oil. Since the oil in the oil chamber is flowing, the oil will take away the heat generated by the pole coils, and the temperature rise of the coils will be very small. Therefore, there is no need for fans in traditional motors to cool down, which will reduce noise and energy loss.

[0015] 3. In the present invention, as long as the pole coil is energized, the gears and the gear ring can rotate. Therefore, the motor pump does not need an additional transmission shaft extending out of the housing, and therefore does not need to connect the motor rotating shaft to the transmission shaft by using a coupling. This greatly reduces the volume and weight of the gear pump and simplifies installation. At the same time, when the coupling is not used, the reliability of the gear pump operation is improved, the energy loss of energy conversion and the vibration of the shaft are reduced. Since the shaft no longer extends out of the housing, there is no need to perform skeleton sealing on the shaft hole, and the risk of oil leakage is reduced.

[0016] 4. In the present invention, the gears and the ring gear generate torque under the interaction of the magnetic field and the current, so that the gears and the ring gear rotate. Therefore, the gears and the ring gear are both driving wheels, so the stress on the tooth surface at the meshing point is small, the wear on the teeth is small, and the power density of the motor pump is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1a It is a front view of the internally meshing motor gear pump based on electromagnetic drive of the present invention;

[0018] Figure 1b It is an AA cross-sectional view of the internally meshing motor gear pump based on electromagnetic drive of the present invention;

[0019] Figure 2a It is a left view of the internally meshing motor gear pump based on electromagnetic drive of the present invention;

[0020] Figure 2bIt is a BB cross-sectional view of the internally meshing motor gear pump based on electromagnetic drive of the present invention;

[0021] Figure 3 A half-section axial side view of the internally meshing motor gear pump based on electromagnetic drive of the present invention;

[0022] Figure 4 This is the overall external structure diagram of the externally meshing motor gear pump based on electromagnetic drive of the present invention;

[0023] Figure 5 This is the overall internal structure diagram of the externally meshing motor gear pump based on electromagnetic drive of the present invention;

[0024] Figure 6 It is an enlarged view of the structure at position C in the externally meshing motor gear pump based on electromagnetic drive of the present invention;

[0025] Figure 7 It is a structural diagram of a housing cover plate and an externally meshing floating side plate in an externally meshing motor gear pump based on electromagnetic drive of the present invention;

[0026] Figure 8 It is an assembly structure diagram of the external meshing gear in the external meshing motor gear pump based on electromagnetic drive of the present invention;

[0027] Fig. 9 The present invention is a magnetic pole distribution diagram on the stator coil and the rotor coil in the externally meshing motor gear pump based on electromagnetic drive.

[0028] Main reference numerals:

[0029] Crescent plate end cover 1, housing 2, gear inner slip ring 3, gear 4, gear ring inner slip ring 5, gear ring 6, floating side plate 7, cover plate 8, bolt 9, housing pole coil 10, gear ring pole coil 11, crescent plate pole coil 12, gear pole coil 13, core shaft 101, crescent plate 103, O-ring 15, external meshing housing 16, screw 17, main cover plate 18, stator coil 19, external meshing gear 20, rotor coil 21, slip ring 22, stator cover plate 23, housing cover plate 24, sealing ring 25, external meshing floating side plate 26, rotor cover plate 27, fixed side plate 28. DETAILED DESCRIPTION

[0030] In order to fully describe the technical content, objectives and effects of the present invention, the following will be described in detail with reference to the accompanying drawings.

[0031] Electromagnetic internal gear pumps, such as Figures 1a to 3As shown, it includes a crescent plate end cover 1, a shell 2, a gear inner slip ring 3, a gear 4, a gear ring inner slip ring 5, a gear ring 6, a floating side plate 7, a cover plate 8, bolts 9, a shell pole coil 10, a gear ring pole coil 11, a crescent plate pole coil 12, a gear pole coil 13 and an O-ring 15.

[0032] like Figure 1a , 1b and Figure 3 As shown, the first mounting end of the gear ring 6 is connected to the first mounting end of the crescent plate end cover 1, the second mounting end of the gear ring 6 is connected to the first end of the floating side plate 7, the second end of the floating side plate 7 is connected to the first mounting end of the cover plate 8, the mounting end of the gear 4 is connected to the first mounting end of the core shaft 101 on the crescent plate end cover 1, the gear 4 and the gear ring 6 are meshed, the second mounting end of the crescent plate end cover 1 is fixedly connected to the second end of the housing 2 by the O-ring 15 and the bolt 9, and the second mounting end of the cover plate 8 is connected to the third end of the housing 2 by the O-ring 15 and the bolt 9.

[0033] As shown in FIG2 , the tooth root circle of the gear 4 is grooved along the tooth groove to form an armature sheet structure, and a magnetic pole coil is wound on the armature sheet. At the same time, a circular groove is cut on both end faces of the gear 4 to facilitate the installation of the gear inner slip ring 3 to power the magnetic pole coil. The outer ring of the gear ring 6 is grooved inward to form an armature sheet structure, and a magnetic pole coil is wound on the armature sheet. The gear ring inner slip ring 5 is installed on one side of the gear ring 6 to facilitate the power supply of the magnetic pole coil. The position of the crescent plate end cover 1 is grooved to form an armature sheet structure, and a magnetic pole coil is wound on the position of the armature sheet. There are holes on the core shaft 101 to facilitate the lead wires on the slip ring 22 that supplies power to the gear magnetic pole coil 13 on the gear 4 to be led out of the housing 2. The outer ring of the crescent plate end cover 1 is also holed to facilitate the fixing of the slip ring 22 that supplies power to the gear ring magnetic pole coil 11, and the wiring of the slip ring 22 and the wiring of the crescent plate magnetic pole coil 12 can be led out of the housing 2 through this hole. The shell 2 is grooved to form an armature sheet structure, and a coil is wound on the armature sheet. The coils of two adjacent armature sheets are wound in opposite directions. It is then filled with resin and polished to the initial shape, size and smoothness of components such as the shell 2, gear 4, gear ring 6 and crescent plate end cover 1.

[0034] Specifically, the housing 2, the gear ring 6, the crescent plate 103 on the crescent plate end cover 1 and the gear 4 are respectively provided with a housing pole coil 10, a gear ring pole coil 11, a crescent plate pole coil 12 and a gear pole coil 13. The gear ring pole coil 11 and the gear pole coil 13 generate a uniform magnetic field, and the housing pole coil 10 and the crescent plate pole coil 12 generate an alternating magnetic field. The alternating magnetic field generated by the housing pole coil 10 acts on the uniform magnetic field of the gear ring pole coil 11 to drive the gear ring 6 along The inner ring of the shell 2 rotates, and the alternating magnetic field generated by the crescent plate pole coil 12 acts on the uniform magnetic field of the gear pole coil 13 to drive the gear 4 to rotate along the core shaft 101. The inner slip ring 5 of the gear ring is fixedly connected to the mounting end of the crescent plate 103 by screws 17, and the inner slip ring 3 of the gear is connected to the second mounting end of the core shaft 101. The wires on the inner slip ring 5 of the gear ring and the inner slip ring 3 of the gear are led out of the shell 2 through holes punched in the crescent plate end cover 1, and are respectively connected to the positive and negative power supply wires of the external power supply system.

[0035] Preferably, the gear 4 and the ring gear 6 are actively rotated under the action of the magnetic field generated by their respective magnetic pole coils, and both belong to the driving wheel. The meshing of the gear 4 and the ring gear 6 is mainly to form a closed cavity for oil suction and discharge, rather than meshing transmission. The cavity of the shell 2 is provided with an annular groove and an armature sheet structure for mounting the shell magnetic pole coil 10 near the oil suction and discharge ports, respectively. The floating side plate 7 close to the side of the gear 4 is also fan-shapedly grooved near the oil suction and discharge ports to facilitate the entry and exit of the oil. The floating side plate 7 is cut with a high-pressure oil groove on the side close to the cover plate 8, and a hole is punched in the oil groove to communicate with the high-pressure oil chamber in the pump chamber.

[0036] In a preferred embodiment of the present invention, the outer gear ring slip ring is designed as an integral part with the gear ring 6, and the first and last wires of the gear ring magnetic pole coil 11 are respectively welded to the inner gear ring slip ring 5 and the outer gear ring slip ring. The inner gear ring slip ring 5 and the outer gear ring slip ring are always kept in close contact when the gear ring 6 rotates, and power is continuously supplied to the gear ring magnetic pole coil 11. A groove is cut on the gear 4 and the outer gear slip ring is installed inside the gear 4 to form an integral design. The first and last wires of the gear magnetic pole coil 13 are respectively welded to the outer gear slip ring and the inner gear slip ring 3. The outer gear slip ring and the inner gear slip ring 3 are always kept in close contact when the gear 4 rotates, and power is continuously supplied to the gear magnetic pole coil 13.

[0037] Specifically, the crescent plate end cover 1, the gear 4, the gear ring 6 and the floating side plate 7 are located inside the housing 2. The axes of the floating side plate 7, the gear inner slip ring 3, the core shaft 101 and the gear 4 are on the same straight line, and the axes of the crescent plate end cover 1, the housing 2, the gear ring inner slip ring 5, the gear ring 6 and the cover plate 8 are on the same straight line.

[0038] The second aspect of the present invention is based on an electromagnetically driven externally meshing motor gear pump, such as Figure 4 and Figure 5As shown, it includes an outer meshing housing 16, screws 17, a main cover plate 18, a stator coil 19, an outer meshing gear 20, a rotor coil 21, a slip ring 22, a stator cover plate 23, a housing cover plate 24, a sealing ring 25, an outer meshing floating side plate 26, a rotor cover plate 27 and a fixed side plate 28. Preferably, the outer meshing floating side plate 26 mainly seals to reduce oil entrapment, reduce working noise, and adjust the axial clearance, reduce internal leakage, improve volume efficiency, and prevent fluid leakage in the gear pump. An oil channel is dug on one side, which is conducive to adjusting the liquid pressure of the oil pressure chamber.

[0039] like Figure 5 and Figure 6 As shown, the first end and the second end of the external meshing housing 16 are respectively provided with a fixed support and a gear shaft, the fixed support is a conventional external meshing gear, and is made by annular grooves at the root of the teeth, the first mounting end of the external meshing housing 16 is fixedly connected to the main cover plate 18 by screws 17, the second mounting end of the external meshing housing 16 is fixedly connected to the housing cover plate 24, and the mounting end of the external meshing gear 20 and the rotor cover plate 27 are respectively connected to the first mounting end and the second mounting end of the gear shaft.

[0040] like Figure 7 and Figure 8 As shown, the tooth root of the external meshing gear 20 is provided with a rotor coil 21, and the rotor coil 21 is in contact with the rotor cover plate 27. The rotor cover plate 27 prevents the oil from contacting the rotor coil 21, thereby affecting the normal operation of the rotor coil 21, and effectively improving the service life of the rotor coil 21. The fixed support is provided with a stator coil 19, and the stator coil 19 and the stator cover plate 23 are arranged alternately. The stator cover plate 23 is connected to the first end of the fixed side plate 28. The stator cover plate 23 is made of resin glass material. The main purpose is to fill the fixed support to avoid direct contact with the oil. The slip ring 22 is connected to the third mounting end of the gear shaft. The external meshing floating side plate 26 is located between the external meshing gear 20 and the housing cover plate 24. The external meshing floating side plate 26 is connected to the housing cover plate 24 through a sealing ring 25.

[0041] When the stator coil 19 and the rotor coil 21 are energized respectively, a rotating magnetic field will be generated. Under the action of the electromagnetic force, the external gear 20 starts to rotate. In order to prevent the stator coil 19 and the rotor coil 21 from being entangled with each other during the rotation of the external gear 20, slip rings 22 are provided on both sides of the external gear 20 for easy wiring.

[0042] Specifically, the fixed supports are in the shape of bosses, with five groups at the upper and lower ends of the outer gear housing 16, and are evenly and symmetrically distributed along the inner wall of the outer gear housing 16. The axes of the outer gear housing 16, the main cover plate 18, the outer gear floating side plate 26, the fixed side plate 28 and the housing cover plate 24 are on the same straight line; the axes of the outer gear 20, the rotor coil 21, the slip ring 22 and the rotor cover plate 27 are on the same straight line.

[0043] The following is a further description of an electromagnetically driven motor gear pump according to the present invention in conjunction with an embodiment:

[0044] The working principle of the internal meshing motor gear pump based on electromagnetic drive is as follows:

[0045] First, a direct current is passed through the armature plates of the ring gear 6 to excite the armature plates on the ring gear 6 to generate a circular uniform magnetic field consisting of alternating N poles and S poles, and then an alternating current is passed through the armature plates on the shell 2 to excite the adjacent shell pole coils 10 to generate magnetic fields with different poles, and the magnetic poles will change as the direction of the current changes. Then, the armature plates on the shell 2 will form an alternating magnetic field, and the alternating magnetic field acts on the uniform magnetic field generated by the armature plates of the ring gear 6 to drive the ring gear 6 to rotate along the inner ring of the shell 2.

[0046] Next, current is passed through the armature piece of the gear 4 to excite the armature piece on the gear 4 to generate a circular uniform magnetic field consisting of alternating N poles and S poles, and then an alternating current is passed through the armature piece on the crescent plate end cover 1 to excite the adjacent crescent plate pole coils 12 to generate magnetic fields with different poles, and the magnetic poles will change as the direction of the current changes. Then, the armature piece on the crescent plate end cover 1 will form an alternating magnetic field, and the alternating magnetic field acts on the uniform magnetic field generated by the armature piece of the gear 4 to drive the gear 4 to rotate around the core shaft 101.

[0047] Finally, since the gear 4 and the gear ring 6 are meshed with each other, they will rotate synchronously, and the crescent plate end cover 1 will divide the meshed gear 4 and gear ring 6 into two closed cavities, forming an oil suction cavity in the area where the gear 4 is disengaged, and an oil discharge cavity in the area where the gear 4 is meshed. In the oil suction cavity, the gear 4 and the gear ring 6 are disengaged, and the cavity volume increases to form a vacuum to complete the oil suction. Since the oil groove of the floating side plate 7 will pass high-pressure oil, the floating side plate 7 is close to the end face of the gear 4. At this time, the gear 4, the gear ring 6, the floating side plate 7 and the crescent plate end cover 1 form a closed transition cavity, and the sucked oil is transferred to the oil discharge cavity in the closed transition cavity. In the oil discharge cavity, the gear 4 and the gear ring 6 are meshed with each other, and the high-pressure oil is compressed to enter the oil discharge port for oil discharge, and finally the gear pump's oil suction and discharge process is completed through electromagnetic force.

[0048] The device integrates the driving motor and the gear pump into one, and winds the gear 4, the gear ring 6, the inner ring of the housing 2 and the crescent plate end cover 1 of the gear pump with magnetic pole coils. After power is turned on, the gear 4 and the gear ring 6 are driven to rotate through the action of the magnetic field, which avoids the assembly of the motor main shaft and the pump drive shaft, simplifies the installation, improves the reliability of the gear pump operation, reduces the loss in the power transmission process, and has higher transmission efficiency. At the same time, it avoids the gear pump drive shaft from extending out of the housing 2, reducing the risk of oil leakage.

[0049] The working principle of the external gear motor gear pump based on electromagnetic drive is as follows:

[0050] First, three-phase alternating current is applied to the rotor coil 21 located at the root of the outer gear 20 and the stator coil 19 located at the fixed support to generate an alternating rotating magnetic field with a circular uniform magnetic field formed by alternating magnetic poles N and S. Fig. 9 As shown, the magnetic poles will change as the direction of the current changes. The magnetic poles located at the rotor coil 21 and the stator coil 19 drive the external meshing gear 20 to start rotating according to the principle that like attracts like and opposites repel each other, and the external meshing motor gear pump starts working.

[0051] Then the oil is introduced into the oil inlet of the external meshing motor gear pump, flows into the oil suction area, flows into the oil pressure area under the transmission of the external meshing gear 20, and is discharged from the oil outlet hole of the external meshing motor gear pump connected to the oil pressure area. Since the two external meshing gears 20 are meshed with each other, the external meshing housing 16, the main cover plate 18, the housing cover plate 24, the external meshing floating side plate 26 and the tooth valleys of the external meshing gear 20 form a number of sealed working chambers.

[0052] Finally, as one side of the external meshing gear 20 is disengaged, the volume of the disengaged side area changes from small to large, forming a vacuum, sucking the oil to form an oil suction chamber, and on the meshing side, the volume of the space changes from large to small, discharging the oil to form an oil pressure chamber. The oil suction chamber and the oil pressure chamber cooperate with each other to form an oil suction and discharge process.

[0053] This device integrates the drive motor and the gear pump into one, relies on electromagnetic action to make the gear pump run automatically, and controls the gear speed by controlling the current in the coil. It has fast response speed and low noise, optimizes the gear pump structure, and improves the reliability of the working system and the efficiency of the oil pump.

[0054] The embodiments described above are only descriptions of the preferred implementation modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A motor gear pump based on electromagnetic drive, comprising a crescent plate end cover, a housing, a gear, a gear inner slip ring, a gear ring inner slip ring, a gear ring, a floating side plate, a cover plate and a magnetic pole coil, It is characterized in that The first mounting end of the gear ring is connected to the first mounting end of the crescent plate end cover, the second mounting end of the gear ring is connected to the first end of the floating side plate, the second end of the floating side plate is connected to the first mounting end of the cover plate, the mounting end of the gear is connected to the first mounting end of the mandrel on the crescent plate end cover, the gear is meshed with the gear ring, the second mounting end of the crescent plate end cover is connected to the second end of the housing through an O-ring, and the O-ring of the second mounting end of the cover plate is connected to the third end of the housing; The shell, the gear ring, the crescent plate on the crescent plate end cover and the gear are respectively provided with a shell pole coil, a gear ring pole coil, a crescent plate pole coil and a gear pole coil. The gear ring pole coil and the gear pole coil generate a uniform magnetic field, and the shell pole coil and the crescent plate pole coil generate an alternating magnetic field. The alternating magnetic field generated by the shell pole coil acts on the uniform magnetic field of the gear ring pole coil to drive the gear ring to rotate along the inner ring of the shell. The alternating magnetic field generated by the crescent plate pole coil acts on the uniform magnetic field of the gear pole coil to drive the gear to rotate along the core shaft. The inner slip ring of the gear ring is fixedly connected to the mounting end of the crescent plate, and the inner slip ring of the gear is connected to the second mounting end of the core shaft.

2. The electromagnetically driven motor gear pump according to claim 1, It is characterized in that The crescent plate end cover, the gear, the gear ring and the floating side plate are located inside the shell.

3. The electromagnetically driven motor gear pump according to claim 1, It is characterized in that The axes of the floating side plate, the gear inner slip ring, the core shaft and the gear are in the same straight line, and the axes of the crescent plate end cover, the housing, the gear ring inner slip ring, the gear ring and the cover plate are in the same straight line.

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