CN111541324A - Radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor - Google Patents

Radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor Download PDF

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Publication number
CN111541324A
CN111541324A CN202010364024.0A CN202010364024A CN111541324A CN 111541324 A CN111541324 A CN 111541324A CN 202010364024 A CN202010364024 A CN 202010364024A CN 111541324 A CN111541324 A CN 111541324A
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CN
China
Prior art keywords
axial
radial
permanent magnet
yoke
pole
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Pending
Application number
CN202010364024.0A
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Chinese (zh)
Inventor
耿伟伟
李强
孙乐
汪诚
蒋雪峰
余剑
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Nanjing University of Science and Technology
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Nanjing University of Science and Technology
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Priority to CN202010364024.0A priority Critical patent/CN111541324A/en
Publication of CN111541324A publication Critical patent/CN111541324A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22Rotating parts of the magnetic circuit
    • H02K1/27Rotor cores with permanent magnets
    • H02K1/2786Outer rotor
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/16Stator cores with slots for windings
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K1/00Details of the magnetic circuit
    • H02K1/06Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12Stationary parts of the magnetic circuit
    • H02K1/16Stator cores with slots for windings
    • H02K1/165Shape, form or location of the slots
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/12Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
    • H02K21/22Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
    • H02K21/227Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos having an annular armature coil
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K7/00Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/003Couplings; Details of shafts
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K2201/00Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
    • H02K2201/03Machines characterised by aspects of the air-gap between rotor and stator

Abstract

The invention discloses a radial-axial bidirectional mixed magnetic circuit frameless permanent magnet motor which comprises an outer shell, a radial back yoke, a radial permanent magnet, an end cover, an axial permanent magnet, an axial back yoke, an armature winding, a stator core, a support piece, a bearing, a hollow shaft and a screw, wherein an armature winding coil is embedded into a groove of the stator core; the top of the end cover is provided with an outer casing, the middle part of the outer casing is provided with a radial back yoke, the inner surface of the radial back yoke is provided with radial permanent magnets along the circumferential direction, in the radial and axial permanent magnet arrays, adjacent permanent magnets are alternately arranged according to the N pole and S pole directions, and any pair of N pole and S pole at two axial sides are correspondingly arranged along the axial direction, so that a closed magnetic potential forward series magnetic flux loop is formed in the radial direction and the axial direction. The invention improves the torque density, power density and energy efficiency of the motor.

Description

Radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor
Technical Field
The invention relates to the technical field of low-speed and high-torque direct-drive permanent magnet motors, in particular to a radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet motor.
Background
The motion of a class of motor-driven objects in military and civil use has the characteristics of high inertia, high torque and low speed, such as the horizontal motion of tanks and self-propelled gun turrets, and the horizontal motion of crane races and large rotating platforms. The traditional electric driving mode adopts a driving mode of 'driving motor + speed reducer', the rated rotating speed of the driving motor is generally in the range of thousands of revolutions per minute, the rated rotating speed is far higher than the operating speed of dozens of revolutions per minute or even a few revolutions per minute of the driving object, and the rated torque of the driving motor is also far lower than the torque of thousands of newton meters required for dragging the driving object, so that the speed reduction and the torque increase are realized by the matched speed reducer. However, due to the introduction of the speed reducer, transmission clearance and elastic deformation of the gear inevitably exist, the nonlinear ring section has great influence on the motion stability, the low-speed performance and the motion precision, the transmission efficiency is reduced, the performance of a motion system is restricted, meanwhile, due to the adoption of the speed reducer, higher requirements are provided for the installation space, and the complexity of the traditional structure of the whole driving system is increased. An effective solution idea is to cancel a speed reducer and adopt a motor direct-drive scheme.
When the motor direct drive scheme is adopted to drag the load to rotate, two design difficulties exist in the design of the driving motor, the first point is that the output torque of the motor can reach thousands of newton meters, and the second point is that the structure of the motor is compact, so that the installation space is saved. Because the permanent magnet synchronous motor has a simple structure and is better in the aspects of efficiency, power density and the like, the permanent magnet synchronous motor is widely applied to industrial production and daily life. The magnetic fluxes of the permanent magnet motor commonly used at present are generally divided into radial magnetic fluxes and axial magnetic fluxes, however, the utilization rate of the end parts of the permanent magnet motor is low, the utilization rate of the whole space of the motor is not high, and the torque density and the power density of the motor still have a lifting space. In the traditional motor design, the motor is optimized in size, for example, a radial permanent magnet motor adopts a structure with a large length-diameter ratio, an axial permanent magnet motor adopts a structure with a small length-diameter ratio, and the torque density is improved by adopting technologies such as fractional concentrated winding and the like, but the effect is limited, so that the search for a more compact motor structure with a large torque density is always a research hotspot.
The invention patent 201610247112.6 provides a multi-stator mixed magnetic circuit permanent magnet motor and a method, which comprises a radial stator, an axial stator and a rotor, wherein the rotor is sleeved inside the radial stator and is coaxially arranged with the radial stator, one end or two ends of the rotor are provided with the axial stator, the axial stator and the rotor are concentrically arranged, a radial winding is arranged in a stator slot of the radial stator, an axial winding is arranged in an axial stator slot, a rotor slot is arranged on the rotor, a permanent magnet is arranged in the slot, the permanent magnet enables a radial magnetic pole and an axial magnetic pole to be generated on the rotor, the radial magnetic pole faces to the radial stator of the motor, and the axial magnetic pole faces to the. The invention patent 201910564807.0 proposes a radial and axial mixed flux high torque permanent magnet motor, in which the stator assembly also includes a radial stator and an axial stator, both of which include respective stator cores and windings, the rotor assembly includes a radial flux permanent magnet and an axial flux permanent magnet, the radial flux permanent magnet is disposed on the side surface of the casing, and the axial flux permanent magnet is disposed on the top end of the casing. The two motor structures provided by the two patents have the common characteristics that the radial and axial spaces of the motor are fully utilized, the positions of the permanent magnets are reasonably arranged, the magnetizing directions are set, a mixed magnetic circuit with radial and axial parallel connection is formed, and the torque density and the power density are increased. However, in these two motors, the armature windings have separate radial and axial parts, which not only increases the copper loss but also makes the structure slightly complicated, and because the space for people to enter and exit needs to be reserved between the turret of the tank or the self-propelled gun and the connecting part of the lower vehicle body, the two motor structures can not meet the requirement of directly driving the horizontal rotation of the turret of the tank or the self-propelled gun, and still need to be further improved.
Disclosure of Invention
The invention aims to provide a radial-axial bidirectional mixed magnetic circuit frameless permanent magnet motor which is high in torque density and power density and high in energy efficiency.
The technical solution for realizing the purpose of the invention is as follows: a radial-axial bidirectional mixed magnetic circuit frameless permanent magnet motor comprises an outer shell, a radial back yoke, a radial permanent magnet, an end cover, an axial permanent magnet, an axial back yoke, an armature winding, a stator core, a support piece, a bearing, a hollow shaft and a screw;
the armature winding coil is embedded into a slot of the stator core, the stator core is installed on the periphery of the hollow shaft through a support piece, bearings are arranged on two sides of the hollow shaft, end covers are arranged on the bearings, an axial back yoke is arranged in the middle of each end cover, and an axial permanent magnet is installed on the surface of the inner side of the axial back yoke; the top of the end cover is provided with an outer shell, the middle part of the outer shell is provided with a radial back yoke, and the inner surface of the radial back yoke is provided with a radial permanent magnet along the circumferential direction;
the two side end covers and the outer side machine shell are sealed into a cavity through screws and are installed on the shaft wall of the hollow shaft through bearings, a radial air gap is formed between the stator core and the radial permanent magnet, and two axial air gaps are formed between the stator core and the axial permanent magnet.
As a specific example, the stator core is formed by die-casting a soft magnetic composite material, a plurality of slot positions are uniformly arranged along the circumferential direction, and each slot position is axially and symmetrically provided with 2 small slots.
As a specific example, an even number of radial permanent magnets are uniformly and fixedly arranged on the inner side of the radial back yoke along the circumferential direction, each radial permanent magnet is magnetized in the radial direction, and adjacent radial permanent magnets are alternately arranged in the N pole direction and the S pole direction.
As a specific example, even axial permanent magnets are uniformly and fixedly mounted on the inner side of the axial back yoke along the circumferential direction, the shape, thickness and pole arc width of each axial permanent magnet are the same, the number and mounting positions of the axial permanent magnets on the two axial back yokes are the same, each axial permanent magnet is magnetized along the axial direction, adjacent permanent magnets on the same side are alternately arranged in the directions of the N pole and the S pole, and the polarities of the two axial permanent magnets corresponding to the axial positions on the two sides of the axial back yoke along the axial direction are the same.
As a specific example, the closed magnetic flux loop excited by each adjacent pair of N, S poles in the radial permanent magnet and the axial permanent magnet passes through the same armature winding coil along the same direction to form a radial and axial mixed superposed magnetic circuit.
Compared with the prior art, the invention has the remarkable advantages that: (1) the advantages of the outer rotor and the topology of the axial flux motor are fully utilized, the torque density is greatly improved, the motor structure is simple, and the occupied space is small; (2) the permanent magnets are arranged in the axial direction and the radial direction, so that a mixed magnetic circuit with the radial direction and the axial direction overlapped with each other is realized, the flux linkage and the counter electromotive force are increased, and the torque is improved; (3) the hollow rotating shaft is adopted, and the motor is hollow, so that the wire arrangement is facilitated, and the actual situation of a connecting part structure of a gun turret and a vehicle body of a tank or a self-propelled gun is adapted; (4) the form of fractional slot annular concentrated winding is adopted, so that the winding is saved, the copper consumption is reduced, and the motor efficiency is improved.
Drawings
Fig. 1 is a structural cross-sectional view of a radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet synchronous motor according to the present invention.
Fig. 2 is a schematic view of the final assembly structure of the present invention.
Fig. 3 is a plan view of a bearing according to an embodiment of the present invention in the axial direction.
FIG. 4 is a cross-sectional view of a bearing along direction AA in an embodiment of the present invention.
Fig. 5 is an exploded view of the structure of an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a stator core of a radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet motor according to an embodiment of the present invention.
Fig. 7 is a schematic structural view of a radial portion of an inverted U-shaped rotor in an embodiment of the present invention.
Fig. 8 is a schematic structural view of an axial portion of an inverted U-shaped rotor in an embodiment of the present invention.
Fig. 9 is a schematic structural view of a stator unit in an embodiment of the present invention.
Fig. 10 is a schematic view of a magnetic circuit of a radial permanent magnet in an embodiment of the present invention.
Fig. 11 is a schematic view of a magnetic circuit of an axial permanent magnet in the embodiment of the present invention.
Detailed Description
The invention relates to a radial-axial bidirectional mixed magnetic circuit frameless permanent magnet motor which comprises an outer shell 1, a radial back yoke 2, a radial permanent magnet 3, an end cover 4, an axial permanent magnet 5, an axial back yoke 6, an armature winding 7, a stator core 8, a supporting piece 9, a bearing 10, a hollow shaft 11 and a screw 12;
the armature winding 7 coil is embedded into a groove of a stator core 8, the stator core 8 is installed on the periphery of a hollow shaft 11 through a support piece 9, bearings 10 are arranged on two sides of the hollow shaft 11, an end cover 4 is arranged on each bearing 10, an axial back yoke 6 is arranged in the middle of each end cover 4, and an axial permanent magnet 5 is installed on the inner side surface of each axial back yoke 6; the top of the end cover 4 is provided with an outer casing 1, the middle part of the outer casing 1 is provided with a radial back yoke 2, and the inner side surface of the radial back yoke 2 is provided with a radial permanent magnet 3 along the circumferential direction;
the two side end covers 4 and the outer side machine shell 1 are sealed into a cavity through screws 12 and are installed on the shaft wall of the hollow shaft 11 through bearings 10, a radial air gap is formed between the stator iron core 8 and the radial permanent magnet 3, and two axial air gaps are formed between the stator iron core 8 and the axial permanent magnet 5.
Further, the stator core 8 is formed by die-casting a soft magnetic composite material, a plurality of slot positions are uniformly arranged along the circumferential direction, and each slot position is axially and symmetrically provided with 2 small slots.
Furthermore, even radial permanent magnets 3 are uniformly and fixedly installed on the inner side of the radial back yoke 2 along the circumferential direction, each radial permanent magnet 3 is magnetized in the radial direction, and adjacent radial permanent magnets 3 are alternately arranged in the N-pole and S-pole directions.
Furthermore, even axial permanent magnets 5 are uniformly and fixedly installed on the inner side of the axial back yoke 6 along the circumferential direction, the shape, thickness and pole arc width of each axial permanent magnet 5 are the same, the number and installation positions of the axial permanent magnets 5 of the axial back yokes 6 on the two sides are the same, each axial permanent magnet 5 is magnetized along the axial direction, adjacent permanent magnets on the same side are alternately arranged in the N pole direction and the S pole direction, and the polarities of the two axial permanent magnets 5 corresponding to the axial positions on the two sides in the axial direction are the same.
Further, closed magnetic flux loops excited by each adjacent pair of N, S poles in the radial permanent magnet 3 and the axial permanent magnet 5 penetrate through the same armature winding coil along the same direction, so that a radial and axial mixed superposed magnetic circuit is formed.
The invention is described in further detail below with reference to the figures and the specific embodiments.
Examples
The invention relates to a radial-axial bidirectional mixed magnetic circuit frameless permanent magnet motor, which comprises a stator and an inverted U-shaped rotor, wherein the stator part comprises a stator iron core 8 and an armature winding 7, the inverted U-shaped rotor comprises a radial part and an axial part, the radial part comprises a back yoke 2 in a thin cylinder shape, an outer side machine shell 1 and a permanent magnet 3, the axial part comprises two axial sides, and each side comprises a disc-shaped back yoke 6, an end cover 4 and a permanent magnet 5;
a stator part is arranged between the disc-shaped back yokes 6 at two axial sides, end covers 4 are arranged at the outer sides of the two axial sides, the end covers 4 at two axial sides and the radial outer side casing 1 are sealed to form a cavity, the stator part and the inverted U-shaped rotor are arranged in the cavity, and the stator part and the inverted U-shaped rotor are integrally sleeved on the shaft wall of the hollow shaft 11;
radial air gaps are formed between the radial parts of the inverted U-shaped rotor and the stators, and two axial air gaps are respectively formed between the two axial sides of the inverted U-shaped rotor and the middle stator.
Further, the stator core 8 in the shape of a cylindrical ring is formed by die-casting a soft magnetic composite material, a plurality of slot positions are uniformly arranged along the circumferential direction, and each slot position is axially symmetrically provided with 2 small slots.
Furthermore, a plurality of permanent magnets 3 are uniformly and fixedly arranged on the inner side of a back yoke 2 of the radial part of the inverted U-shaped rotor along the circumferential direction, and the shape, the thickness and the width of a pole arc of each permanent magnet are completely the same.
Further, the number of the permanent magnets 3 fixedly installed on the inner side of the back yoke 2 in the radial part of the inverted U-shaped rotor is even, each permanent magnet 3 is magnetized in the radial direction, and the adjacent permanent magnets 3 are alternately arranged in the N-pole and S-pole directions.
Furthermore, a plurality of permanent magnets 5 are fixedly arranged on the inner sides of back yokes 6 on two axial sides of the inverted U-shaped rotor along the circumferential direction, the shape, the thickness and the pole arc width of each permanent magnet 5 are completely the same, and the installation positions of each permanent magnet 5 on two axial sides are in one-to-one correspondence.
Further, the permanent magnets 5 installed on the two axial sides are the same in number, the number of the permanent magnets is even, and each permanent magnet 5 is magnetized in the axial direction.
Further, in each permanent magnet 5 installed on any side in the axial direction, adjacent permanent magnets are alternately arranged in the N-pole and S-pole directions, and the polarities of the two permanent magnets 5 corresponding to the axial direction at the two sides in the axial direction are the same and are both the N-pole or S-pole.
Further, due to the symmetry of the motor structure, closed magnetic flux loops excited by each adjacent pair of N, S poles in the radial permanent magnet 3 and the axial permanent magnet 5 pass through the same armature winding coil along the same direction to form a radial and axial mixed superposed magnetic circuit.
With reference to fig. 1 and 2, the radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet synchronous motor of the present invention includes an outer casing 1, a radial back yoke 2, a radial permanent magnet 3, an end cover 4, an axial permanent magnet 5, an axial back yoke 6, an armature winding 7, a stator core 8, a support 9, a bearing 10, a hollow shaft 11, and a screw 12;
the armature winding 7 coil is embedded into a groove of a stator core 8, the stator core 8 is installed on the periphery of a hollow shaft 11 through a support piece 9, bearings 10 are arranged on two sides of the hollow shaft 11, an end cover 4 is arranged on each bearing 10, an axial back yoke 6 is arranged in the middle of each end cover 4, and an axial permanent magnet 5 is installed on the inner side surface of each axial back yoke 6; the top of the end cover 4 is provided with an outer casing 1, the middle part of the outer casing 1 is provided with a radial back yoke 2, and the inner side surface of the radial back yoke 2 is provided with a radial permanent magnet 3 along the circumferential direction;
the two side end covers 4 and the outer side machine shell 1 are sealed into a cavity through screws 12 and are installed on the shaft wall of the hollow shaft 11 through bearings 10, a radial air gap is formed between the stator iron core 8 and the radial permanent magnet 3, and two axial air gaps are formed between the stator iron core 8 and the axial permanent magnet 5.
As shown in fig. 2, which is a schematic view of an assembly structure of the radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet synchronous motor of the present invention, a cavity is formed outside the motor by the outer casing 1, the end covers 4 at two axial sides, and the axial wall of the hollow shaft 11, a stator and a rotor of the motor are both installed in the cavity, and the motor is integrally sleeved on the axial wall of the hollow shaft 11; 60 slot positions are uniformly arranged on the stator core 8 in the circumferential direction, each slot position is symmetrically provided with 2 small slots along the axial direction, and each coil of the armature winding 7 is embedded into the stator slot; the rotor part consists of a radial part and an axial part, the radial part comprises an outer casing 1, a radial back yoke 2 and a radial permanent magnet 3, the axial part is provided with two axial sides, and each side comprises an end cover 4, an axial back yoke 6 and an axial permanent magnet 5.
As shown in fig. 3, in a plan view of the bearing of the radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet synchronous motor of the present invention along the axial direction, since the interior of the connecting portion between the turret and the lower body of the tank or the self-propelled gun is hollow, the middle portions of the driving motor and the bearing must be hollow.
As shown in fig. 4, which is a plan view of the bearing 10 according to the embodiment of the present invention in the axial direction, the bearing type is a tapered roller bearing because the bearing 10 is required to bear loads in both the radial direction and the axial direction.
Fig. 5 is an exploded view of the radial-axial bidirectional hybrid magnetic circuit frameless pm synchronous machine according to the present invention.
As shown in fig. 6, which is a schematic structural diagram of a stator core 8 according to an embodiment of the present invention, the stator core 8 is in a cylindrical ring shape, and is formed by die casting using a soft magnetic composite material, 60 slot positions are respectively and uniformly distributed on two axial end surfaces of the stator core 8 along a circumferential direction, and each slot position is axially and symmetrically provided with 2 small slots.
As shown in fig. 7, a radial core portion of the inverted U-shaped rotor according to an embodiment of the present invention includes a radial back yoke 2 in a thin-walled cylinder shape and a radial permanent magnet 3 inside the radial back yoke, the radial permanent magnet 3 includes 50 radial permanent magnet small blocks, each radial permanent magnet small block has the same shape, thickness, and pole arc width, and the 50 permanent magnet small blocks are magnetized along a radial direction, and adjacent radial permanent magnets are alternately arranged in an N-pole direction and an S-pole direction.
As shown in fig. 8, each of the core portions at two axial sides of the inverted U-shaped rotor according to the embodiment of the present invention includes an end cover 4, an axial back yoke 6 and axial permanent magnets 5, the axial permanent magnets 5 are respectively and fixedly mounted on the inner side surfaces of the axial back yokes 6 at two axial sides, the axial permanent magnets 5 at two axial sides are composed of 50 small blocks, the shape, thickness and pole arc width of each axial permanent magnet small block are the same, and the distribution positions of each permanent magnet small block on two axial end surfaces are in one-to-one correspondence with respect to the axial direction; all the small blocks in the axial permanent magnet 5 are magnetized along the axial direction, and the adjacent axial permanent magnets on each side of the axial direction are alternately arranged according to the N pole direction and the S pole direction.
The radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor provided by the invention has the advantages that the number of pole pairs is 25, the number of slots is 60, the armature winding 7 is of an annular concentrated winding structure, the radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor belongs to the category of fractional slot concentrated windings, and as the maximum common multiple of the number of the pole pairs and the number of the slots is 5, 5 pairs of poles and 12 slots form a unit motor structure, as shown in fig. 9.
Due to structural symmetry, the radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet synchronous motor provided by the invention is described by a pair of magnetic pole structural units, as shown in fig. 10, which is a schematic view of a radial magnetic circuit of an embodiment of the invention, a radial permanent magnet 3 comprises 2 small radial permanent magnets, an armature winding 7 takes a winding coil, one of the 2 small radial permanent magnets is magnetized into a cavity along a radial direction, the other adjacent small radial permanent magnet is magnetized out of the cavity along the radial direction, a magnetic line of force starts from the small radial permanent magnet which is magnetized inwards along the radial direction, passes through a winding coil through a radial air gap and a stator core 8, and returns to the original small radial permanent magnet through the radial air gap, the other small radial permanent magnet and a radial back yoke 2 to form a radial magnetic circuit.
The radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor provided by the invention has the advantages that due to the structural symmetry, a pair of magnetic pole structure units are taken from two axial end faces respectively for description. As shown in fig. 11, which is a schematic view of an axial magnetic circuit according to an embodiment of the present invention, the axial permanent magnets 5 on both sides in the axial direction include 2 small permanent magnets, and of the two axial permanent magnets on each side, one small axial permanent magnet charges into the cavity along the axial direction, the other adjacent small axial permanent magnet charges towards a direction away from the cavity along the axial direction, and the two small axial permanent magnets corresponding to the axial positions both charge into the cavity along the axial direction or charge out of the cavity along the axial direction. Magnetic lines of force on two axial sides start from the small permanent magnet blocks in the cavity in the magnetizing direction, flow through the axial air gap and the stator iron core 8, pass through the winding coil, and then return to the small axial permanent magnet starting from the magnetic lines of force through the axial air gap, the other small axial permanent magnet and the axial back yoke 6 to form 2 magnetic circuits which are axially connected in parallel.
Referring to fig. 10 and 11, for the same winding coil, 3 magnetic lines connected in parallel are passed through the winding coil in the same direction, of which 2 belong to the axial magnetic circuit and the other belongs to the radial magnetic circuit, so as to form a superimposed hybrid magnetic circuit.
The invention fully utilizes the respective advantages of the outer rotor and the axial flux motor topology, realizes larger torque density improvement, and has simple motor structure and small occupied space; the permanent magnets are arranged in the axial direction and the radial direction, so that a mixed magnetic circuit with the radial direction and the axial direction overlapped with each other is realized, the flux linkage and the counter electromotive force are increased, and the torque is improved; the hollow rotating shaft is adopted, and the motor is hollow, so that the wire arrangement is facilitated, and the actual situation of a connecting part structure of a gun turret and a vehicle body of a tank or a self-propelled gun is adapted; the form of fractional slot annular concentrated winding is adopted, so that the winding is saved, the copper consumption is reduced, and the motor efficiency is improved.

Claims (5)

1. A radial-axial bidirectional mixed magnetic circuit frameless permanent magnet motor is characterized by comprising an outer shell (1), a radial back yoke (2), a radial permanent magnet (3), an end cover (4), an axial permanent magnet (5), an axial back yoke (6), an armature winding (7), a stator core (8), a support piece (9), a bearing (10), a hollow shaft (11) and a screw (12);
the armature winding (7) coil is embedded into a groove of the stator core (8), the stator core (8) is installed on the periphery of the hollow shaft (11) through a support piece (9), bearings (10) are arranged on two sides of the hollow shaft (11), an end cover (4) is arranged on each bearing (10), an axial back yoke (6) is arranged in the middle of each end cover (4), and an axial permanent magnet (5) is installed on the inner side surface of each axial back yoke (6); an outer shell (1) is arranged at the top of the end cover (4), a radial back yoke (2) is arranged in the middle of the outer shell (1), and a radial permanent magnet (3) is arranged on the inner side surface of the radial back yoke (2) along the circumferential direction;
the two side end covers (4) and the outer side shell (1) are sealed into a cavity through screws (12), the cavity is installed on the shaft wall of a hollow shaft (11) through a bearing (10), a radial air gap is formed between the stator core (8) and the radial permanent magnet (3), and two axial air gaps are formed between the stator core (8) and the axial permanent magnet (5).
2. The radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet motor according to claim 1, wherein the stator core (8) is formed by die-casting soft magnetic composite materials, a plurality of slot positions are uniformly arranged along the circumferential direction, and each slot position is axially symmetrically provided with 2 small slots.
3. The radial-axial bidirectional hybrid magnetic circuit frameless permanent magnet motor according to claim 1, wherein an even number of radial permanent magnets (3) are uniformly and fixedly arranged on the inner side of the radial back yoke (2) along the circumferential direction, each radial permanent magnet (3) is magnetized in the radial direction, and adjacent radial permanent magnets (3) are arranged alternately in the N-pole direction and the S-pole direction.
4. The radial-axial bidirectional mixed magnetic circuit frameless permanent magnet motor according to claim 1, wherein an even number of axial permanent magnets (5) are uniformly and fixedly mounted on the inner side of the axial back yoke (6) along the circumferential direction, the shape, thickness and pole arc width of each axial permanent magnet (5) are the same, the number and mounting positions of the axial permanent magnets (5) of the axial back yokes (6) on both sides are the same, each axial permanent magnet (5) is axially magnetized, adjacent permanent magnets on the same side are alternately arranged in the N-pole and S-pole directions, and the polarities of two corresponding axial permanent magnets (5) on both axial sides are the same.
5. The frameless permanent magnet motor with a radial-axial bidirectional hybrid magnetic circuit structure of claim 3 or 4, wherein closed magnetic flux loops excited by each adjacent pair of N, S poles in the radial permanent magnet (3) and the axial permanent magnet (5) pass through the same armature winding coil along the same direction to form a radial-axial hybrid superposed magnetic circuit.
CN202010364024.0A 2020-04-30 2020-04-30 Radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor Pending CN111541324A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010364024.0A CN111541324A (en) 2020-04-30 2020-04-30 Radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor

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Application Number Priority Date Filing Date Title
CN202010364024.0A CN111541324A (en) 2020-04-30 2020-04-30 Radial-axial bidirectional mixed magnetic circuit frameless permanent magnet synchronous motor

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CN111541324A true CN111541324A (en) 2020-08-14

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1650501A (en) * 2002-04-30 2005-08-03 波峰实验室责任有限公司 Rotary electric motor having at least two axially air gaps separating stator and rotor segments
US20090295249A1 (en) * 2008-06-02 2009-12-03 Denso Corporation Hybrid-type synchronous machine
CN104753291A (en) * 2015-04-22 2015-07-01 哈尔滨工业大学 Radio and axial hybrid magnetic circuit permanent-magnet synchronous-side rotor motor
CN106059131A (en) * 2016-07-04 2016-10-26 湖南大学 Hybrid magnetic path driving motor
CN206727857U (en) * 2017-05-24 2017-12-08 南京埃斯顿自动控制技术有限公司 A kind of servo clamp hollow shaft permagnetic synchronous motor
CN110611381A (en) * 2019-09-27 2019-12-24 南京理工大学 Drum-type distributed winding axial hybrid excitation motor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1650501A (en) * 2002-04-30 2005-08-03 波峰实验室责任有限公司 Rotary electric motor having at least two axially air gaps separating stator and rotor segments
US20090295249A1 (en) * 2008-06-02 2009-12-03 Denso Corporation Hybrid-type synchronous machine
CN104753291A (en) * 2015-04-22 2015-07-01 哈尔滨工业大学 Radio and axial hybrid magnetic circuit permanent-magnet synchronous-side rotor motor
CN106059131A (en) * 2016-07-04 2016-10-26 湖南大学 Hybrid magnetic path driving motor
CN206727857U (en) * 2017-05-24 2017-12-08 南京埃斯顿自动控制技术有限公司 A kind of servo clamp hollow shaft permagnetic synchronous motor
CN110611381A (en) * 2019-09-27 2019-12-24 南京理工大学 Drum-type distributed winding axial hybrid excitation motor

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