A permanent magnet integrated motor

Abstract

The present invention relates to a permanent magnet integrated motor, wherein a rotating shaft is arranged in a housing, a cylindrical motor stator and a disc motor stator are sequentially connected in series on the rotating shaft, one end of the disc motor stator is provided with a disc motor rotor disk matched therewith, fixed end covers are arranged at both ends of the housing, and hard windings are arranged through the cylindrical motor stator and the disc motor stator. When in use, the torque density and output capacity of the motor are further improved in a limited space by combining the spatial structural characteristics of the disc motor and the cylindrical motor, and the current harmonics generated by the cylindrical motor structure and the disc motor have differences in phase and amplitude, thereby achieving a mutually weakening effect, which is beneficial to improving the motor waveform and improving the motor performance.

Description

Technical Field

[0001] The present invention relates to the technical field of permanent magnet synchronous motors, and in particular to a permanent magnet integrated motor, and in particular to an integrated motor composed of a permanent magnet cylinder motor and a disc motor. Background Art

[0002] With the intensification of commercial scale and global competition of motors, the industry has put forward a series of higher technical requirements for motor drive systems in terms of high speed, high power density, lightweight and miniaturization, low cost, low energy consumption, high reliability and consistency. With the further development of the motor industry, it is difficult for traditional permanent magnet motors to meet the increasingly high performance requirements, especially how to improve the output torque of the motor in a limited volume space. Conventional cylindrical motors require a relatively large axial space for the motor due to the relatively high stator winding ends, resulting in the motor's torque density being inferior to that of disc motors. At the same time, the motor torque density is between 8Nm / kg and 10Nm / kg, while the disc motor torque density can reach 20Nm / kg to 25Nm / kg. Disc motors are suitable for occasions with relatively small axial space and cannot fully utilize the spatial characteristics of relatively large axial space. Permanent magnet motors can be divided into radial magnetic field and axial magnetic field according to the direction of the magnetic field. Axial magnetic field motors are also called disc permanent magnet motors. The axial dimension of disc motors is short, which can be used in occasions requiring thin installation. They have high torque density and compact structure.

[0003] Permanent magnet motors can be divided into radial magnetic field and axial magnetic field according to the direction of the magnetic field. The radial magnetic field motor is also called a cylindrical permanent magnet motor. The cylindrical motor requires a suitable length-to-diameter ratio space, has a large motor output torque, higher power density and high-speed weak magnetic performance.

[0004] Patent No. CN 205945322 U proposes a combined AC and DC motor, which uses two controllers to control the DC and AC motors respectively, resulting in high costs and inconvenient installation. In addition, the problem of magnetic field interference during the operation of the two sets of motors must be considered, which is not suitable for practical applications. Summary of the invention

[0005] The object of the present invention is to provide an improved permanent magnet integrated motor, which can overcome the problems in the prior art that the internal space of the motor cannot be fully utilized and the motor performance is poor.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is: a permanent magnet integrated motor, including a casing, characterized in that: a rotating shaft is provided in the casing, a cylindrical motor stator and a disc motor stator are sequentially connected in series on the rotating shaft, one end of the disc motor stator is provided with a disc motor rotor disk matching therewith, fixed end covers are respectively provided at both ends of the casing, and hard windings are penetrated through the cylindrical motor stator and the disc motor stator.

[0007] Preferably, the hard winding is formed by assembling a plurality of hard winding groups into a cylindrical shape, each hard winding group is formed by stacking four formed coils in a stepped manner, so that there is a misalignment between the formed coils of each layer above and below; one end of the hard winding is bent and snapped onto the surface of the disc motor stator to form a disc winding, and the other end is inserted into the cylindrical motor stator and bent to form a cylindrical winding. The number of slots of the cylindrical motor stator is the same as that of the disc motor, and the number of rotor poles is the same.

[0008] Furthermore, a cylindrical rotor is arranged inside the cylindrical motor stator, a cylindrical permanent magnet is embedded in the cylindrical rotor, and a magnetic isolation plate is arranged between the cylindrical rotor and the disc motor stator.

[0009] Furthermore, a disc-type permanent magnet is embedded in the disc-type motor rotor disc, and the disc-type permanent magnet is fixed to the disc-type rotor disc by screws, and the screws are located at the geometric center of the permanent magnet.

[0010] Furthermore, one end of each hard winding group is bent into a V-shape and snapped onto the surface of the disc motor stator, so that the disc winding and the cylindrical winding intersect vertically at 90 degrees. Each hard winding group is composed of 4-8 stacked shaped coils, each of which includes a V-shaped end and a vertical portion perpendicular to the V-shaped end. The four shaped coils are stacked longitudinally at the V-shaped end and stacked in parallel horizontally at the vertical portion. The V-shaped angle of the V-shaped end here is 15-50 degrees.

[0011] Compared with the prior art, the technical solution of the present invention not only improves the overall technical solution, but also includes many improvements in details. Specifically, it has the following beneficial effects:

[0012] 1. In the improved scheme of the present invention, a cylindrical motor stator and a disc motor stator are sequentially connected in series on the rotating shaft, and fixed end covers are respectively provided at both ends of the housing. The current harmonics generated by the cylindrical motor structure and the current harmonics generated by the disc motor have differences in phase and amplitude, thereby achieving a mutual weakening effect, which is beneficial to improving the motor waveform and improving the motor performance;

[0013] 2. In the technical solution of the present invention, a hard winding is provided through the stator of the cylindrical motor and the disc motor. Due to the structure of the hard winding, the slot filling rate is greatly increased, and the hard winding at the end is used to make a disc motor, which increases the utilization rate of copper and improves the efficiency of the motor;

[0014] 3. The present invention combines the characteristics of the cylindrical permanent magnet synchronous motor and the disc motor, fully utilizes the internal space of the motor, and adopts the disc motor structure at the shaft end, further improving the torque density of the motor;

[0015] 4. The design structure of the present invention has reasonable layout, convenient processing, low cost, and is easy to promote and apply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a cross-sectional view of the present invention.

[0018] Figure 3 It is a schematic structural diagram of the hard winding grouping of the present invention.

[0019] Figure 4 It is a schematic diagram of the structure of the hard winding of the present invention.

[0020] Figure 5 It is a schematic structural diagram of the hard winding of the present invention inserted into the stator of the cylindrical motor.

[0021] Figure 6 It is a schematic diagram of the combination of the hard winding and the disc motor stator of the present invention.

[0022] Reference numerals:

[0023] 1. Front cover 2. Casing 3. Cylinder motor stator 4. Disc motor stator 5. Disc motor rotor 6. Rear cover 7. Round nut 8. Hard winding 9. Disc permanent magnet 10. Round nut 11. Magnetic isolation plate 12. Hard winding 13. Rotor end plate 14. Shaft 15. Bearing;

[0024] 81. Hard winding group 82. V-shaped end 83. Vertical part. DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention provides a permanent magnet integrated motor, see Figure 1 , including a casing, which differs from the prior art in that: a rotating shaft is arranged in the casing, a cylindrical motor stator and a disc motor stator are sequentially connected in series on the rotating shaft, one end of the disc motor stator is provided with a disc motor rotor disk matched therewith, fixed end covers are respectively arranged at both ends of the casing, and hard windings are penetrated through the cylindrical motor stator and the disc motor stator.

[0027] Specifically, the winding adopts a hard winding, which is buckled on the disc motor stator in a U shape, and 4-8 hard windings are stepped. A through hole is opened under the stator housing, and the hard winding is led out from the through hole and inserted into the drum motor stator, and the other end is bent and welded. The present invention combines the characteristics of the drum permanent magnet synchronous motor and the disc motor, makes full use of the internal space of the motor, and adopts a disc motor structure at the shaft end, which further improves the torque density of the motor. The torque density is increased from the original drum motor torque density of 8Nm / kg to 10Nm / kg to 14Nm / kg to 18Nm / kg.

[0028] In one embodiment, a cylindrical motor stator and a disc motor stator are fixedly installed in the casing cavity, a hard winding is passed through the stator, a rotor disk is arranged on the rear end cover of the disc stator, a permanent magnet is arranged between the stator and the rotor disk, the permanent magnet is fixed on the rotor disk, and the rotor disk is sleeved on the rotating shaft.

[0029] Furthermore, the hard winding is composed of several hard winding groups assembled into a cylindrical frame structure, generally 8-20 hard winding groups are assembled, each hard winding group is composed of four formed coils stacked in a stepped manner, so that there is a misalignment between the formed coils in each upper and lower layer; one end of the hard winding is bent and snapped onto the surface of the disc motor stator to form a disc winding, and the other end is inserted into the cylindrical motor stator and bent to form a cylindrical winding.

[0030] It is further explained that the misalignment between each layer of the upper and lower formed coils of the hard winding group can make the spatial structure more compact and improve the winding utilization rate. If the thickness of the formed coil is b, the misalignment distance is b+0.3mm to b+0.5mm.

[0031] Specifically, one end of each hard winding group is bent into a V-shape and snapped onto the surface of the disc motor stator, so that the disc winding and the cylindrical winding intersect vertically at 90 degrees. Each hard winding group is composed of four stacked shaped coils, each of which includes a V-shaped end and a vertical portion perpendicular to the V-shaped end, where the vertical portion intersects vertically with the V-shaped opening end, and the four shaped coils are stacked vertically up and down along the radial direction of the shaft at the V-shaped end, and are stacked horizontally in parallel front and back along the radial direction of the shaft at the vertical portion, where the V-shaped angle of the V-shaped end is 15-50 degrees.

[0032] Furthermore, one end of each hard-wound group can also be bent into a U shape and then snapped onto the surface of the disc motor stator. Eight formed coils are stacked to form a hard-wound group, and there is a misalignment between each layer of formed coils above and below the hard-wound group.

[0033] In another embodiment, the number of slots of the cylindrical motor stator is the same as the number of slots of the disc motor, and the number of rotor poles is the same. A cylindrical rotor is arranged in the cylindrical motor stator, a cylindrical permanent magnet is embedded in the cylindrical rotor, and a magnetic isolation plate is arranged between the cylindrical rotor and the disc motor stator. A disc permanent magnet is embedded in the disc motor rotor disk, and the disc permanent magnet is fixed to the disc rotor disk by screws, and the screws are located at the geometric center of the permanent magnet. The disc motor stator is formed by stacking 12 silicon steel sheets and is fixed in the disc electronic stator housing by screws. The cylindrical motor rotor and the disc motor rotor are radially fixed to the rotating shaft by keyways, and a deep groove ball bearing is respectively provided at both ends of the rotating shaft.

[0034] One end of each hard winding group is bent into a V-shape and snapped onto the surface of the disc motor stator, so that the disc winding and the cylindrical winding intersect vertically at 90 degrees. The vertical part here intersects vertically with the V-shaped opening end. The four formed coils are stacked vertically up and down along the radial direction of the shaft at the V-shaped end, and are stacked horizontally front and back along the radial direction of the shaft at the vertical part. The V-shaped angle of the V-shaped end here is 30 degrees, and then the two sides of the V-shape are translated, so that the slots can be parallel slots, just enough to hold the hard winding, and the slot fill rate will be very high.

[0035] In a specific embodiment, a cylindrical 12-slot 8-pole motor stator and a disc-type 12-slot 8-pole electronic stator are connected in series. The current harmonics generated by the cylindrical motor structure and the current harmonics generated by the disc motor differ in phase and amplitude, thereby achieving a mutual weakening effect, which is beneficial to improving the motor waveform and improving the motor performance. The current harmonics can be effectively reduced, and the harmonic distortion rate can be reduced by more than 50% compared with that of an ordinary cylindrical motor.

[0036] Specifically, the disc motor stator has a 12-slot 8-pole structure, with two coils in each slot and surface-mounted magnets. The winding uses a hard winding, which is buckled on the disc motor stator in a U shape. The 6 hard windings are stepped. A through hole is opened under the stator shell. The hard winding is led out from the through hole and inserted into the cylinder motor stator. The other end is bent and welded. The stator of the cylinder motor has the same number of slots and the same number of rotor poles as the disc motor. It uses a centralized winding with 8 conductors per slot. The number of poles of the cylinder motor is the same as that of the disc motor, and there will be no uneven force on the shaft due to different magnetic pole structures.

[0037] To sum up, the present invention combines the characteristics of cylindrical motors and disc motors, and adopts a motor structure that combines cylindrical and disc motors when a relatively large axial space is required, fully utilizing the axial space size and the characteristics of large output per unit volume of the disc motor. The disc motor structure is adopted at the shaft end to further improve the torque density of the motor. The torque density is increased from the original cylindrical motor torque density of 8Nm / kg to 10Nm / kg to 14Nm / kg to 18Nm / kg. A new permanent magnet motor structure is proposed, which improves the space utilization of the motor and increases the torque output of the motor.

[0038] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to the above descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A permanent magnet integrated motor, comprising a housing, characterized in that: A rotating shaft is arranged in the casing, on which a cylindrical motor stator and a disc motor stator are sequentially connected in series, one end of the disc motor stator is provided with a disc motor rotor disk matched therewith, fixed end covers are arranged at both ends of the casing respectively, and hard windings are penetrated through the cylindrical motor stator and the disc motor stator; the hard windings are composed of several hard winding groups assembled into a cylindrical shape, each hard winding group is composed of 4-8 formed coils stacked in a stepped manner, so that there is a misalignment between the formed coils of each upper and lower layer; if the thickness of the formed coil is b, then the misalignment distance is b+0.3mm to b+0.5mm.

2. A permanent magnet integrated motor according to claim 1, characterized in that: One end of the hard winding is bent and snapped onto the surface of the disc motor stator to form a disc winding, and the other end is inserted into the cylindrical motor stator and bent to form a cylindrical winding.

3. A permanent magnet integrated motor according to claim 1, characterized in that: The number of slots in the stator of a cylinder motor is the same as that of a disc motor, and the number of rotor poles is the same.

4. A permanent magnet integrated motor according to claim 1, characterized in that: A cylindrical rotor is arranged inside the cylindrical motor stator, a cylindrical permanent magnet is embedded in the cylindrical rotor, and a magnetic isolation plate is arranged between the cylindrical rotor and the disc motor stator.

5. The permanent magnet integrated motor according to claim 1, characterized in that: A disc-type permanent magnet is embedded in the disc-type motor rotor disc. The disc-type permanent magnet is fixed to the disc-type rotor disc by screws, and the screws are located at the geometric center of the permanent magnet.

6. A permanent magnet integrated motor according to claim 2, characterized in that: One end of each hard winding group is bent into a V-shape and snapped onto the surface of the disc motor stator, so that the disc winding and the cylindrical winding intersect vertically at 90 degrees.

7. A permanent magnet integrated motor according to claim 6, characterized in that: Each hard winding group is composed of four stacked shaped coils, each of which includes a V-shaped end and a vertical portion perpendicular to the V-shaped end. The four shaped coils are stacked longitudinally at the V-shaped end and stacked in parallel horizontally at the vertical portion. The V-shaped angle of the V-shaped end here is 15-50 degrees.

8. The permanent magnet integrated motor according to claim 1, characterized in that: The disc motor stator is made of laminated silicon steel sheets and is fixed in the disc electronic stator housing by screws.

9. The permanent magnet integrated motor according to claim 1, characterized in that: The drum-type motor rotor and the disc-type motor rotor are radially fixed to the rotating shaft through a keyway, and a deep groove ball bearing is respectively provided at both ends of the rotating shaft.

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