Hybrid excitation axial and radial magnetic flux motor

Abstract

The invention relates to a hybrid excitation axial and radial flux motor, which comprises an axial stator assembly, a casing, a rotor, a radial stator and a radial stator winding, and is characterized in that the rotor comprises axial permanent magnets, magnetic conductive blocks, radial permanent magnets and a mandrel; the axial stator assembly comprises an annular excitation winding, an axial iron core tooth part, an axial iron core yoke part, an axial winding, a magnetic conductive ring and an axial stator shell; axial permanent magnets and magnetic conductive blocks are attached to the two ends of the rotor; axial stator assemblies are arranged on the two sides of the machine shell, magnetic conductive rings are installed on the outer sides of the axial stator assemblies, and annular exciting windings are installed in the magnetic conductive rings. The axial permanent magnets and the magnetic conductive blocks are additionally arranged on the two sides of a traditional radial permanent magnet motor rotor, and the annular excitation windings, the axial iron core tooth parts, the axial iron core yoke parts, the axial windings and the magnetic conductive rings are additionally arranged in the end covers, so that the power density of the motor is improved, and the power adjusting range of the permanent magnet motor is widened; therefore, the hybrid excitation axial and radial magnetic flux motor can efficiently and reliably operate in a wide rotating speed range.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, and particularly relates to a hybrid excitation permanent magnet motor combining axial and radial magnetic circuits. BACKGROUND

[0002] Permanent magnet motors have the advantages of high power density and high efficiency and are widely used in industrial fields, but only have a single permanent magnet excitation source inside, and the magnetic field is difficult to adjust, which limits the speed range, efficiency expansion, voltage regulation range, fault protection capability, etc. Meanwhile, in recent years, with the improvement of motor manufacturing process and the development of electric drive of industrial and household products, axial flux motors have replaced traditional radial flux motors in some fields due to their higher power density and higher rotor core utilization rate. Exploring new motors that meet the requirements of high power density and high efficiency and reliable operation in a wide speed range has become a focus in the field of electric machines.

[0003] In the prior art, the magnetic field of the permanent magnet motor is difficult to adjust, and the rotor space is not fully utilized when the axial / radial magnetic circuit is independently designed, and the power density is limited. For example, a kind of axial-radial hybrid flux motor is disclosed in patent document (CN103001424A), but the stator is concentrated on the central shaft, resulting in low space utilization, and there is no independent excitation winding, and the magnetic field is not adjustable. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a hybrid excitation axial-radial flux motor, which combines the advantages of radial and axial flux permanent magnet motors. The permanent magnet rotor part of the axial flux motor is integrated on both sides of the rotor, thereby fully utilizing the space on both sides of the rotor; and the advantages of the axial flux motor and the radial flux motor are fully combined.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows: a hybrid excitation axial-radial flux motor, comprising an axial stator assembly, a housing, a rotor, a radial stator, a radial stator winding, the rotor comprising an axial permanent magnet, a magnetic conducting block, a radial permanent magnet and a mandrel; the axial stator assembly comprises a ring-shaped excitation winding, an axial core tooth portion, an axial core yoke portion, an axial winding, a magnetic conducting ring and an axial stator housing; the rotor is provided with an axial permanent magnet and a magnetic conducting block on both ends; the housing is provided with an axial stator assembly on both sides, and the outer side of the housing is provided with a magnetic conducting ring, and the magnetic conducting ring is internally provided with a ring-shaped excitation winding.

[0006] Further, the end portion of the rotor is divided into a plurality of angle-equal sectors in the circumferential direction, each sector is further divided into two rings, one of the two regions of the same sector is provided with a permanent magnet, and the other is provided with a magnetic conducting block, and the area of the permanent magnet is equal to that of the magnetic conducting block; the two regions of the same ring are provided with a permanent magnet and a magnetic conducting block respectively, and the permanent magnets near the same magnetic conducting block have opposite magnetic field directions.

[0007] Furthermore, the magnetic fields formed by the axial permanent magnets installed at the same phase at both ends of the rotor have the same direction.

[0008] Furthermore, the number of poles of the radial permanent magnet is equal to that of the axial permanent magnet, thereby ensuring that the current frequencies output by the radial stator winding and the axial stator winding are equal.

[0009] Furthermore, the annular excitation winding is embedded in the magnetic conductive ring, and direct current is passed through to adjust the axial magnetic field strength of the rotor.

[0010] Furthermore, when the motor is running, direct current is passed through the annular excitation winding to generate an excitation magnetic field in the axial direction of the rotor. The size of the excitation magnetic field is controlled by the size of the direct current; the magnetic field is strengthened or weakened by the direction of the direct current.

[0011] Furthermore, the annular excitation windings of the axial stator assemblies on both sides can independently adjust the current magnitude and direction to achieve control of the motor output power.

[0012] Furthermore, the magnetic conductive blocks and the magnetic conductive rings are made of silicon steel sheets or soft magnetic composite materials.

[0013] Furthermore, the axial permanent magnets at both ends of the rotor are neodymium iron boron permanent magnets, and the radial permanent magnets are ferrite permanent magnets.

[0014] Furthermore, the radial stator and the axial stator assembly form an integrated structure through the casing.

[0015] The beneficial effects of the present invention are:

[0016] By adding axial permanent magnets and magnetic blocks on both sides of the traditional radial permanent magnet motor rotor, and adding annular excitation windings, axial iron core teeth, axial iron core yokes, axial windings, and magnetic rings in the end cover, the motor power density is improved, the power adjustment range of the permanent magnet motor is improved, and the hybrid excitation axial radial flux motor can operate efficiently and reliably within a wide speed range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of the hybrid excitation axial-radial flux motor of the present invention;

[0018] Figure 2 This is a diagram of the rotor assembly of the present invention;

[0019] Figure 3 is a position diagram of the stator assembly of the present invention;

[0020] Figure 4 for Figure 3 Right view;

[0021] Figure 5 This is a schematic diagram of the installation of the radial permanent magnet of the present invention. DETAILED DESCRIPTION

[0022] The application will be further described in detail below with reference to the accompanying drawings and examples.

[0023] As shown in the drawings, Figures 1 to 4 The hybrid excitation axial-radial flux motor of the application comprises an axial stator assembly 1, a housing 2, a rotor 3, a radial stator 4, and a radial stator winding 5. The rotor 3 comprises axial permanent magnets 31, magnetic conductive blocks 32, radial permanent magnets 33, and a mandrel 34. The axial stator assembly 1 comprises an annular excitation winding 11, axial core teeth 12, an axial core yoke 13, axial windings 14, a magnetic conductive ring 15, and an axial stator housing 16.

[0024] The rotor 3 comprises a plurality of radial permanent magnets 33. The magnetic field direction of the radial permanent magnets 33 is radial. The radial stator 4 is arranged outside the radial permanent magnets 33. The radial stator 4 has stator slots inside which the radial stator winding 5 is embedded. Figure 5 The end portion of the rotor 3 is divided into a plurality of angularly equal sectors in the circumferential direction. Each sector is further divided into two rings. One of the two regions of the same sector is provided with a magnetic conductive block 32, and the other is provided with an axial permanent magnet 31. The area of the axial permanent magnet 31 is equal to that of the magnetic conductive block 32. The two regions of the same ring are provided with an axial permanent magnet 31 and a magnetic conductive block 32, respectively. The axial permanent magnet 31 adjacent to the magnetic conductive block 32 has an opposite magnetic field direction, thereby forming a closed magnetic circuit. The magnetic field directions of the axial permanent magnets 31 at the two ends of the rotor 3 are the same, thereby ensuring that the current phases of the axial windings 14 at the two ends are consistent.

[0025] The axial stator assembly 4 is shown in Figure 3 The axial stator assembly 4 is shown in

[0026] The hybrid excitation axial-radial flux motor has equal numbers of the radial permanent magnets 33 and the axial permanent magnets 31, thereby ensuring that the current frequencies output by the radial stator winding 5 and the axial stator winding 14 are equal.

[0027] The annular excitation winding 11 is installed outside the stator core yoke 13, and direct current is passed through the annular excitation winding 11 during the operation of the motor, so as to generate an excitation magnetic field in the axial direction of the rotor, and the size of the excitation magnetic field is controlled by the size of the direct current; the direction of the direct current can be used to strengthen or weaken the magnetic field; the current direction and size of the two annular excitation windings 11 in the left and right axial stator 4 assemblies can be adjusted as required, so as to control the output power of the motor.

Claims

1. A hybrid excitation axial-radial flux motor, comprising an axial stator assembly, a housing, a rotor, a radial stator, and a radial stator winding, characterized in that: The rotor includes axial permanent magnets, magnetic blocks, radial permanent magnets, and a core shaft; the axial stator assembly includes an annular excitation winding, axial iron core teeth, axial iron core yoke, axial winding, magnetic ring, and axial stator casing; axial permanent magnets and magnetic blocks are attached to both ends of the rotor; there are axial stator assemblies on both sides of the casing, with magnetic rings installed on the outside and annular excitation windings installed inside the magnetic rings.

2. The hybrid excitation axial-radial flux motor according to claim 1, characterized in that: The rotor end is divided into several sectors with equal angles in the circumferential direction. Each sector is divided into two circles, inner and outer. One of the inner and outer areas of the same sector is installed with a permanent magnet, and the other is installed with a magnetic block, and the areas of the permanent magnet and the magnetic block are equal; the two adjacent areas of the same circle are respectively installed with permanent magnets and magnetic blocks, and the permanent magnets near the same magnetic block have opposite magnetic field directions.

3. The hybrid excitation axial-radial flux motor according to claim 2, characterized in that: The magnetic fields formed by the axial permanent magnets installed at the same phase at both ends of the rotor have the same direction.

4. The hybrid excitation axial-radial flux motor according to claim 1, characterized in that: The number of poles of the radial permanent magnet is equal to that of the axial permanent magnet, ensuring that the current frequencies output by the radial stator winding and the axial stator winding are equal.

5. The hybrid excitation axial-radial flux motor according to claim 1, characterized in that: The annular excitation winding is embedded in the magnetic ring and DC power is passed through to adjust the axial magnetic field strength of the rotor.

6. The hybrid excitation axial-radial flux motor according to claim 5, characterized in that: When the motor is running, direct current is passed through the annular excitation winding to generate an excitation magnetic field in the axial direction of the rotor. The size of the excitation magnetic field is controlled by the size of the direct current; the magnetic field is strengthened or weakened by the direction of the direct current.

7. The hybrid excitation axial-radial flux motor according to claim 1, characterized in that: The annular excitation windings of the axial stator assemblies on both sides can independently adjust the current size and direction to achieve control of the motor output power.

8. The hybrid excitation axial-radial flux motor according to claim 1, characterized in that: The magnetic blocks and magnetic rings are made of silicon steel sheets or soft magnetic composite materials.

9. The hybrid excitation axial-radial flux motor according to claim 1, characterized in that: The axial permanent magnets at both ends of the rotor are neodymium iron boron permanent magnets, and the radial permanent magnets are ferrite permanent magnets.

10. The hybrid excitation axial-radial flux motor according to claim 1, characterized in that: The radial stator and the axial stator assembly form an integrated structure through the casing.

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