CN110601474A - Radial magnetic field composite flux switching motor - Google Patents

Radial magnetic field composite flux switching motor Download PDF

Info

Publication number
CN110601474A
CN110601474A CN201910873644.4A CN201910873644A CN110601474A CN 110601474 A CN110601474 A CN 110601474A CN 201910873644 A CN201910873644 A CN 201910873644A CN 110601474 A CN110601474 A CN 110601474A
Authority
CN
China
Prior art keywords
stator
rotor
radial
motor
pole teeth
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201910873644.4A
Other languages
Chinese (zh)
Inventor
莫丽红
张涛
王业琴
张晨
叶小婷
鲁庆
刘保连
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huaiyin Institute of Technology
Original Assignee
Huaiyin Institute of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huaiyin Institute of Technology filed Critical Huaiyin Institute of Technology
Priority to CN201910873644.4A priority Critical patent/CN110601474A/en
Publication of CN110601474A publication Critical patent/CN110601474A/en
Pending legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K16/00Machines with more than one rotor or stator
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K19/00Synchronous motors or generators
    • H02K19/02Synchronous motors
    • H02K19/10Synchronous motors for multi-phase current
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K21/00Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
    • H02K21/38Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary
    • H02K21/44Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with rotating flux distributors, and armatures and magnets both stationary with armature windings wound upon the magnets

Abstract

The invention relates to the field of motor design, and discloses a radial magnetic field composite type flux switching motor which comprises a fixed shaft (6), a rotating shaft (5) coaxially and rotatably connected with the fixed shaft, an inner rotor (4) surrounding the rotating shaft, an inner stator (3) surrounding the inner rotor, a bearing (23) surrounding the inner stator, an outer stator (2) surrounding the bearing, and an outer rotor (1) surrounding the outer stator; air gaps are arranged between the outer stator and the outer rotor and between the inner stator and the inner rotor; the inner rotor and the outer rotor are fixedly connected with the rotating shaft, the inner stator is fixedly connected with the fixed shaft, and the radial inner side and the radial outer side of the bearing (23) are respectively connected with the outer diameter of the inner stator and the inner diameter of the outer stator. The invention meets the requirements of low-speed large-torque and wide speed regulation range operation of the driving motor on the premise of improving the operation reliability of the permanent magnet and avoiding irreversible demagnetization of the permanent magnet caused by weak magnetic speed regulation and high temperature.

Description

Radial magnetic field composite flux switching motor
Technical Field
The invention relates to the field of motor design, in particular to a radial magnetic field composite type flux switching motor.
Background
In recent years, a flux switching permanent magnet motor (FSPM for short) is widely researched due to high torque density and high efficiency, in the motor structure, a permanent magnet and a winding are both arranged on a stator, the rotor structure is simple, and the reliability and the dynamic running performance of the motor are improved. However, due to the inherent characteristics of the permanent magnet, the air gap field of the FSPM motor is kept constant basically during the operation, and the FSPM motor is difficult to control the excitation and limited in speed regulation range during the electric operation. Therefore, how to realize the limited adjustment and control of the magnetic field and widen the speed regulation range is one of the problems to be solved by the FSPM motor. The study of the hybrid excitation FSPM motor is carried out by the students, the stator is provided with an excitation winding besides the permanent magnet, the dual excitation source hybrid excitation mode is realized, the magnetic field regulation capacity can be improved, and the rotating speed operation range is widened. However, the stator in the motor structure has the permanent magnet and two sets of windings (the excitation winding and the armature winding) at the same time, so that on one hand, the saturation degree of a magnetic circuit is high, on the other hand, the placing space of the armature winding is restricted, and the torque output capacity is limited to a certain degree; and because the heat source is all located the stator, easily lead to stator winding and permanent magnet temperature rise too high, bring winding insulation damage and permanent magnet irreversible demagnetization.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problems in the prior art, the invention provides a radial magnetic field composite type magnetic flux switching motor which meets the requirements of low-speed large-torque and wide speed regulation range operation of a driving motor on the premise of improving the operation reliability of a permanent magnet and avoiding irreversible demagnetization of the permanent magnet caused by weak magnetic speed regulation and high temperature.
The technical scheme is as follows: the invention provides a radial magnetic field composite type flux switching motor which comprises a fixed shaft, a rotating shaft, an inner rotor, an inner stator, a bearing, an outer stator and an outer rotor, wherein the rotating shaft is coaxially and rotatably connected with the fixed shaft; air gaps are arranged between the outer stator and the outer rotor and between the inner stator and the inner rotor; the inner rotor and the outer rotor are fixedly connected with the rotating shaft, the inner stator is fixedly connected with the fixed shaft, and the radial inner side and the radial outer side of the bearing are respectively connected with the outer diameter of the inner stator and the inner diameter of the outer stator.
Furthermore, salient pole teeth are arranged on the opposite sides of the outer rotor and the outer stator and the opposite sides of the inner rotor and the inner stator, no winding is arranged on the salient pole teeth of the outer rotor and the inner rotor, an outer armature winding and a permanent magnet are arranged on the salient pole teeth of the outer stator, and an inner armature winding is arranged on the salient pole teeth of the inner stator.
Preferably, the number of salient pole teeth of the outer stator isP soThe outer armature winding is formed by symmetrically distributedP soA coil sleeved on the salient pole teeth of the outer stator, and an outer armature windingmA phase concentrated winding, satisfyP so=2k 1 mWherein isk 1A positive integer; the number of the salient pole teeth of the outer rotor isP roSatisfy the following requirementsP ro=P so±2N1In which N is1Is a positive integer.
Preferably, the number of the salient pole teeth of the inner stator isP siThe inner armature winding is formed by symmetrically distributedP siA coil sleeved on the salient pole teeth of the inner stator, and the inner armature winding isnA phase concentrated winding, satisfyP si=2k 2 nWherein isk 2A positive integer; the number of the salient pole teeth of the inner rotor isP riSatisfy the following requirementsP ri=P si±2N2In which N is2Is a positive integer.
Preferably, the permanent magnets are tangentially alternately magnetized permanent magnets.
Preferably, the inner rotor yoke portion is fixed to the rotating shaft at a radially inner edge thereof.
Preferably, the outer radial edge of the outer rotor yoke core is fixedly connected to the rotating shaft through a connecting housing.
Preferably, the inner stator yoke core is fixedly coupled to the fixed shaft through an end housing.
Preferably, the outer rotor, the outer stator, the inner rotor and the inner stator have salient pole teeth oriented in a radial direction.
Preferably, the inner armature winding and the outer armature winding are both multiphase concentrated armature windings.
Has the advantages that: the invention relates to a radial magnetic field composite motor, wherein an outer stator and an outer rotor form an outer motor, and an inner stator and an inner rotor form an inner motor; the inner and outer motors are completely independent and have no electromagnetic coupling, so that the inner and outer motors can be independently controlled. The inner motor and the outer motor have various motor structure options, and if the outer motor can adopt a double salient pole permanent magnet motor and a magnetic flux reversal motor. The tooth grooves of the salient pole teeth of the stators and the rotors of the inner motor and the outer motor of the radial magnetic field composite type magnetic flux switching motor are matched, and the number of phases, the excitation mode and the like can be flexibly adjusted according to the performance requirements of the system.
Compared with the prior art, the invention has the following advantages:
1. the inner stator and the inner rotor are both provided with no permanent magnet, so that the high-temperature irreversible demagnetization of the permanent magnet caused by the difficult heat dissipation of the inner motor can be avoided; although the outer motor has permanent magnets, under the action of a bearing on the stator, the speed regulation is completed by the inner motor under a high-speed working condition, and the outer stator of the outer motor can always work near a rated point through the equidirectional rotation when the rotor rotates at a high speed, so that the irreversible demagnetization risk of the permanent magnets caused by the weak magnetic speed regulation of the outer motor is avoided while the torque output is increased; from the two points, the invention improves the working stability of the permanent magnet and the working reliability of the motor.
2. The inner stator and the inner rotor form a speed regulating motor with a wider speed regulating range, the outer stator and the outer rotor form a permanent magnet torque regulating motor with larger torque output capacity, and the two motors are respectively used for regulating the rotating speed and the torque during operation so as to realize the power requirements of loads under different working conditions and meet the requirements of a driving system on low speed, large torque and wide speed regulating range.
3. The inner motor and the outer motor can operate in different working modes such as independent driving or common driving, and the speed-regulating inner motor can operate independently when the permanent magnet of the torque-regulating outer motor fails to work, so that the motor has certain fault tolerance.
Drawings
Fig. 1 is a cross-sectional view of a radial magnetic field composite flux switching motor in which an inner motor is a 3-phase stator 12 slot/rotor 8 pole and an outer motor is a 3-phase stator 12 slot/rotor 22 pole.
Fig. 2 is a cross-sectional view of a radial magnetic field composite flux switching motor of the present invention.
In the figure: the rotor comprises an outer rotor 1, an outer stator 2, an inner stator 3, an inner rotor 4, an outer armature winding 21, a permanent magnet 22, a bearing 23, an inner armature winding 31, a rotating shaft 5, a fixed shaft 6, a connecting shell 7 and an end shell 8.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
The embodiment provides a radial magnetic field composite flux switching motor which mainly comprises a fixed shaft 6, a rotating shaft 5 coaxially and rotatably connected with the fixed shaft 6, an inner rotor 4 surrounding the rotating shaft 5, an inner stator 3 surrounding the inner rotor 4, a bearing 23 surrounding the inner stator 3, an outer stator 2 surrounding the bearing 23 and an outer rotor 1 surrounding the outer stator 2. An air gap is arranged between the outer stator 2 and the outer rotor 1, an air gap is arranged between the inner stator 3 and the inner rotor 4, salient pole teeth without windings are arranged on one side of the outer rotor 1 facing the outer stator 2 and one side of the inner rotor 4 facing the inner stator 3, salient pole teeth and outer armature windings 21 wound on the salient pole teeth are arranged on the outer side of the outer stator 2, and salient pole teeth and inner armature windings 31 wound on the salient pole teeth are arranged on the inner side of the inner stator 3. The inner rotor 4 is fixed on the rotating shaft 5 at the radial inner edge of the yoke part, the outer rotor 1 is fixed with the rotating shaft 5 at the radial outer edge of the yoke part iron core through the connecting shell 7, the inner stator 3 is fixed with the other side fixed shaft 6 through the end shell 8, a bearing 23 is arranged between the inner diameter of the outer stator 2 and the outer diameter of the inner stator 3, the radial inner side and the radial outer side of the bearing 23 are respectively connected with the outer diameter of the inner stator 3 and the inner diameter of the outer stator 2, and the salient pole teeth of the outer stator 2 are internally provided with permanent. It should be noted that the salient pole orientations of the stator and the rotor in the present invention are both directed in the radial direction.
Fig. 1 shows a radial magnetic field composite flux switching motor in which an inner motor is a 3-phase stator 12 slot/rotor 8 pole and an outer motor is a 3-phase stator 12 slot/rotor 22 pole, and the technical solution of the present embodiment will be specifically described below by taking this motor as an example.
12 permanent magnets 22 are distributed on the outer stator 2 along the circumference, an iron core groove unit is arranged between every two adjacent permanent magnets 22, the notch of the iron core groove unit faces the outer rotor 1, the 12 iron core groove units and the 12 permanent magnets are alternately arranged along the circumference, each permanent magnet 22 and two adjacent stator teeth on two tangential sides of the permanent magnet form a salient pole tooth of the outer stator 2, 12 winding coils are wound on the 12 salient pole teeth of the outer stator 2, and 4 winding coils at intervals of 90 degrees are connected in series in the same direction to form a phase concentrated winding, so that a three-phase concentrated armature winding, namely an outer armature winding 21, is formed. The number of salient pole teeth of the outer rotor 1 is 22, and the salient pole teeth thereof face the outer stator 2. The outer rotor 1, the outer stator 2, the permanent magnets 22 on the outer stator and the outer armature winding 21 form a three-phase 12/22-pole permanent magnet flux switching outer motor. The inner stator 3 is an inner salient pole tooth structure, no permanent magnet is arranged on the inner stator, 12 armature winding coils are sleeved on 12 salient pole teeth, and every 4 salient pole teeth are connected in series to form a phase concentrated winding, so that a three-phase inner armature winding, namely an inner armature winding 31 is formed, the number of the salient pole teeth of the inner rotor 4 is 8, and the inner rotor 4, the inner stator 3 and the inner armature winding 31 thereon form a three-phase 12/8-pole switched reluctance inner motor.
The inner motor adopts a switched reluctance motor, has a simple structure, is suitable for high-speed operation, is easy to cool, and can allow higher temperature rise because the inner stator 3 and the inner rotor 4 are both provided with no permanent magnet. The outer motor adopts a permanent magnet flux switching motor structure, and the outer rotor is simple in structure, high in torque density and high in efficiency. Because the outer rotor 1 and the inner rotor 4 are fixedly connected with the rotating shaft 5, the inner motor and the outer motor have the same rotor rotating speed, the inner stator 3 is fixed on the fixed shaft 6 and has no rotating speed, and the outer stator 2 can rotate at a certain rotating speed according to the working condition due to the existence of the bearing 23.
In the embodiment, the internal motor mainly completes the speed regulation of the motor according to the operation requirement, so that the rotating shaft 5 rotates at a target rotating speed and simultaneously outputs a certain torque; the outer motor can enable the outer stator 2 and the outer rotor 1 to rotate in the same direction at a different speed, so that the outer motor works near a rated point with higher efficiency, and the deficiency of the output torque of the inner motor is made up. Therefore, the inner motor and the outer motor are respectively responsible for speed regulation and torque regulation, the inner motor has small volume and is suitable for high-speed operation, and a permanent magnet is not needed, so that the permanent magnet is not needed to participate in weak magnetic speed regulation in the speed regulation process; meanwhile, the outer motor has high torque density and high torque output capacity, and due to the action of the bearing 23, the outer motor can always work near a rated point under different working conditions, so that the shortage of the output torque of the inner motor can be provided by the outer motor no matter the motor operates at low speed or high speed, and the requirements of the motor on low-speed large torque and wide speed regulation range operation are met.
The inner motor system and the outer motor system of the composite motor are not electromagnetically coupled, independent control can be performed according to two common motors, controllable parameters are greatly more than those of a common magnetic flux switching motor, and the composite motor is very flexible. The inner motor and the outer motor can run in different working modes such as single-machine driving, double-machine common driving, double-machine power generation and the like according to different working condition requirements, and when the inner motor and the outer motor both do power generation, two groups of electric energy with different power, frequency, amplitude and voltage grade can be output; the internal and external motor systems can also be operated by one for power generation and the other for electric operation, so as to meet different application occasions and performance requirements.
The motor provided by the invention integrates the permanent magnetic flux switching outer motor and the switched reluctance inner motor in a radial magnetic field motor space, and two power flow paths are provided. The inner motor and the outer motor can adopt other motor structures, so that the flexibility of the system is greatly improved, and the application range is expanded.
The above embodiments are merely illustrative of the technical concepts and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (10)

1. A radial magnetic field composite type flux switching motor is characterized by comprising a fixed shaft (6), a rotating shaft (5) coaxially and rotatably connected with the fixed shaft (6), an inner rotor (4) surrounding the rotating shaft (5), an inner stator (3) surrounding the inner rotor (4), a bearing (23) surrounding the inner stator (3), an outer stator (2) surrounding the bearing (23), and an outer rotor (1) surrounding the outer stator (2); air gaps are arranged between the outer stator (2) and the outer rotor (1) and between the inner stator (3) and the inner rotor (4); the inner rotor (4) and the outer rotor (1) are fixedly connected with the rotating shaft (5), the inner stator (3) is fixedly connected with the fixed shaft (6), and the radial inner side and the radial outer side of the bearing (23) are respectively connected with the outer diameter of the inner stator (3) and the inner diameter of the outer stator (2).
2. The radial magnetic field composite flux switching motor according to claim 1, wherein salient pole teeth are provided on the opposite sides of the outer rotor (1) and the outer stator (2) and the opposite sides of the inner rotor (4) and the inner stator (3), and no winding is provided on the salient pole teeth of the outer rotor (1) and the inner rotor (4), an outer armature winding (21) and a permanent magnet (22) are provided on the salient pole teeth of the outer stator (2), and an inner armature winding (31) is provided on the salient pole teeth of the inner stator (3).
3. A radial-field hybrid flux-switching electric machine according to claim 1, characterized in that the number of salient pole teeth of the outer stator (2) isP soThe outer armature winding (21) is formed by symmetrically distributedP soOne cover is arranged outsideThe coil on the salient pole teeth of the stator (2) is formed, and the outer armature winding (21) ismA phase concentrated winding, satisfyP so=2k 1 mWherein isk 1A positive integer;
the number of salient pole teeth of the outer rotor (1) isP roSatisfy the following requirementsP ro=P so±2N1In which N is1Is a positive integer.
4. A radial magnetic field composite flux switching electric machine according to claim 3, characterized in that the number of salient pole teeth of the inner stator (3) isP siThe inner armature winding (31) is formed by symmetrically distributedP siA coil sleeved on the salient pole teeth of the inner stator (3), and the inner armature winding (31) isnA phase concentrated winding, satisfyP si=2k 2 nWherein isk 2A positive integer;
the number of the salient pole teeth of the inner rotor (4) isP riSatisfy the following requirementsP ri=P si±2N2In which N is2Is a positive integer.
5. Radial field compound flux switching electrical machine according to any of claims 1 to 4, characterized in that the permanent magnets (22) are tangentially alternately magnetized permanent magnets.
6. A radial magnetic field composite flux switching electric machine according to any of claims 1 to 4, characterized in that the radially inner edge of the yoke part of the inner rotor (4) is fixed to the rotating shaft (5).
7. The radial magnetic field composite flux switching motor according to any one of claims 1 to 4, wherein a radially outer edge of a yoke core of the outer rotor (1) is fixedly connected to the rotating shaft (5) through a connection housing (7).
8. A radial magnetic field composite flux switching electric machine according to any of claims 1 to 4, characterized in that the inner stator (3) yoke core is fixedly connected with the fixed shaft (6) by means of an end housing (8).
9. A radial-magnetic-field-combined-type flux-switching electric machine according to any of claims 1 to 4, characterized in that the salient-pole teeth on the outer rotor (1), the outer stator (2), the inner rotor (4) and the inner stator (3) are oriented in the radial direction.
10. A radial-field composite flux-switching electric machine according to any of claims 1 to 4, characterized in that the inner armature winding (31) and the outer armature winding (21) are both multiphase concentrated armature windings.
CN201910873644.4A 2019-09-17 2019-09-17 Radial magnetic field composite flux switching motor Pending CN110601474A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910873644.4A CN110601474A (en) 2019-09-17 2019-09-17 Radial magnetic field composite flux switching motor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910873644.4A CN110601474A (en) 2019-09-17 2019-09-17 Radial magnetic field composite flux switching motor

Publications (1)

Publication Number Publication Date
CN110601474A true CN110601474A (en) 2019-12-20

Family

ID=68859970

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910873644.4A Pending CN110601474A (en) 2019-09-17 2019-09-17 Radial magnetic field composite flux switching motor

Country Status (1)

Country Link
CN (1) CN110601474A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111082622A (en) * 2020-01-10 2020-04-28 南京航空航天大学 Decoupling type birotor alternating pole permanent magnet motor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111082622A (en) * 2020-01-10 2020-04-28 南京航空航天大学 Decoupling type birotor alternating pole permanent magnet motor

Similar Documents

Publication Publication Date Title
CN108011484B (en) Magnetic gear composite motor
JPH11511948A (en) Double salient magnet generator
CN102832771A (en) Combined-type flux switching permanent magnet motor
CN108964396B (en) Stator partition type alternate pole hybrid excitation motor
CN108322002B (en) Fault-tolerant dual-rotor bipolar permanent magnet synchronous motor and method
CN100568677C (en) A kind of pair of stator, single rotor disc type brushless double feed alternating current machine
CN205081652U (en) Armature winding high power density mixed excitation permanent magnet motor of annular yoke portion
CN111211657B (en) Axial disc type five-degree-of-freedom suspension bearingless switched reluctance motor
CN111277092B (en) Stator modularized double-rotor alternating pole permanent magnet motor
CN211151779U (en) Stator permanent magnet type winding mixed excitation two-degree-of-freedom motor
Fu et al. A unified theory of flux-modulated electric machines
CN110492708B (en) Laminated vernier motor
CN109768683B (en) Double-stator magnetic field modulation permanent magnet motor suitable for electric tractor
CN105186749B (en) A kind of ring-shaped yoke portion double winding composite excitation permanent magnet motor
CN110601474A (en) Radial magnetic field composite flux switching motor
CN210405045U (en) Axial parallel composite motor
CN212033854U (en) Permanent magnet synchronous motor with double-armature radial magnetic circuit structure
CN110635639A (en) Radial magnetic field composite double-power current motor
CN210608875U (en) Radial magnetic field composite magnetic flux switching motor
CN106100272A (en) The double-salient-pole magnetic flux controllable motor that a kind of few rare earth tooth yoke is complementary
CN111934508A (en) Radial magnetic field coreless permanent magnet synchronous motor
CN111934506A (en) Non-overlapping winding axial magnetic field permanent magnet synchronous motor
Wang et al. Design of a multi-power-terminals permanent magnet machine with magnetic field modulation
Zhang et al. An improved brushless doubly fed generator with interior PM rotor for wind power applications
CN210608876U (en) Radial magnetic field composite motor

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination