CN114400850B - Parallel brushless hybrid excitation motor based on double magnetic bridges - Google Patents
Parallel brushless hybrid excitation motor based on double magnetic bridges Download PDFInfo
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- CN114400850B CN114400850B CN202210089765.1A CN202210089765A CN114400850B CN 114400850 B CN114400850 B CN 114400850B CN 202210089765 A CN202210089765 A CN 202210089765A CN 114400850 B CN114400850 B CN 114400850B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention discloses a parallel brushless hybrid excitation motor based on double magnetic bridges, which comprises a left stator core, an outer magnetic bridge, a direct current excitation winding, a non-magnetic stator core, a right stator core, a rotating shaft, a permanent magnet, a left rotor core, an inner magnetic bridge, an armature winding and a right rotor core, wherein the left rotor core, the inner magnetic bridge and the right rotor core form a rotor core, and the rotor core is fixedly sleeved on the rotating shaft; the left stator core, the non-magnetic stator core and the right stator core form a stator core, and the stator core is sleeved on the rotor core at intervals; the outer magnetic bridge is fixedly sleeved on the stator core and is jointly fixed on the shell, and the direct-current excitation winding is assembled on the outer magnetic bridge; the permanent magnet is embedded in the rotor core; the armature winding is embedded in the stator core. The invention has the following beneficial effects: the output torque of the motor at low speed is increased, the rotating speed range of the motor is enlarged, a brushless structure is achieved, the permanent magnet demagnetizing risk is reduced, and the power density is improved.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a parallel brushless hybrid excitation motor based on double magnetic bridges.
Background
The motor is an electromagnetic device for converting or transmitting electric energy according to the law of electromagnetic induction, and can be divided into an electric excitation motor and a permanent magnet excitation motor according to an excitation mode. The electric excitation motor adjusts the size of air gap magnetic flux by changing the current in the excitation winding, so that the adjustment characteristics of a wide output voltage range and a wide rotating speed range are achieved, but the existence of the excitation winding can bring serious copper loss, and meanwhile, parts such as an electric brush slip ring and the like can exist, so that the efficiency and the power density of the motor are affected. The permanent magnet excitation motor generates magnetomotive force through the permanent magnet, and an excitation coil is not present, so that the permanent magnet excitation motor has the advantages of high power density, high efficiency, high power factor and the like, but the air gap field cannot be adjusted, and weak magnetic control based on magnetic field orientation is needed. The hybrid excitation motor integrates the advantages of an electric excitation motor and a permanent magnet excitation motor, main magnetomotive force is generated by using a permanent magnet, auxiliary adjustable magnetomotive force is generated by an excitation coil, larger air-gap magnetic field strength is obtained, and meanwhile, the air-gap magnetic field adjustable characteristic is realized, so that the motor has excellent speed regulation capability and higher power density and efficiency.
At present, the structure of the hybrid excitation motor can be divided into (1) a rotor permanent magnet and a rotor excitation winding according to the interaction relation of permanent magnetic potential and electric excitation magnetic potential and the position relation of the permanent magnetic potential and the electric excitation magnetic potential; (2) a rotor permanent magnet and a stator field winding; (3) a stator permanent magnet and a stator field winding; (4) stator permanent magnets and rotor field windings.
The first kind of mixed excitation motor is characterized in that the permanent magnet and the excitation winding are arranged on the rotor pole in series or in parallel, the structure and the principle are simpler, the simulation analysis can be performed under two-dimensional finite element software, and the simulation calculation efficiency is faster. However, the existence of exciting windings in the motor increases parts such as brushes, slip rings and the like, reduces operation reliability, increases manufacturing cost, and meanwhile, the permanent magnet has the risk of demagnetization under the action of the exciting windings.
The permanent magnet of the second kind of hybrid excitation motor is arranged on the rotor, the excitation winding is arranged on the stator, the existence of parts such as an electric brush, a slip ring and the like is avoided, the reliability of the motor is improved, the magnetic circuits of electric excitation and permanent magnet excitation are of parallel structures, and the demagnetizing risk of the excitation winding to the permanent magnet is reduced. However, in order to provide a magnetic circuit for magnetomotive force generated by the exciting winding, some structures are added, so that the power density is reduced, the structures and principles are complex, and simulation analysis is required to be performed by adopting three-dimensional finite element software. In addition, exciting windings of some motors are arranged in devices which are close to two sides of a rotor and fixed on a shell or an end cover, so that a brushless structure is realized, but an additional air gap is introduced, and the magnetic resistance of an electric exciting magnetic circuit is increased.
The third type of hybrid excitation motor is characterized in that an excitation winding is arranged on a stator on the basis of a stator permanent magnet motor, parts such as an electric brush, a slip ring and the like are avoided, simulation analysis can be performed in two-dimensional finite element software, the stator permanent magnet motor can be divided into a doubly salient motor, a magnetic flux reversing motor, a magnetic flux switching motor and a stator slot permanent magnet motor according to the positions of permanent magnets, the topology structure is complex and various after the stator permanent magnet motor is converted into the hybrid excitation motor, and the rotor structure is simple. However, the permanent magnets of the motor have demagnetizing risks, the torque fluctuation is large, and the iron loss is high, so that the efficiency of the motor is affected. The stator has the advantages that the space distribution is difficult and the processing and assembling cost is high because the permanent magnet, the exciting winding and the armature winding are simultaneously arranged.
The fourth type of hybrid excitation motor, i.e. permanent magnets, is on the stator and the excitation windings are on the rotor, which has no relevant design because of its poor performance.
Disclosure of Invention
The invention aims to provide a parallel brushless hybrid excitation motor based on double magnetic bridges, which is based on a tangential permanent magnet synchronous motor and designs an inner magnetic bridge and an outer magnetic bridge to form an axial magnetic circuit, so that the power density of the motor can be improved without sacrificing various excellent performances, and the technical problems related to the background art can be solved.
The technical scheme of the invention is as follows:
the parallel brushless hybrid excitation motor based on double magnetic bridges comprises a left stator core, an outer magnetic bridge, a DC excitation winding, a non-magnetic stator core, a right stator core, a rotating shaft, a permanent magnet, a left rotor core, an inner magnetic bridge, an armature winding and a right rotor core, wherein,
the left rotor core, the inner magnetic bridge and the right rotor core are sequentially connected to form a rotor core, and the rotor core is fixedly sleeved on the rotating shaft and synchronously rotates along with the rotating shaft;
the left side stator core, the non-magnetic stator core and the right side stator core are sequentially connected to form a stator core, and the stator core is sleeved on the rotor core at intervals;
the outer magnetic bridge is fixedly sleeved on the stator core and is jointly fixed on the shell, a containing cavity which is arranged around the stator core is formed in the outer magnetic bridge, and the direct-current excitation winding is assembled in the containing cavity and surrounds the outer side of the stator core;
the permanent magnet is embedded in the rotor core;
the armature winding is embedded in the stator core.
As a preferable improvement of the invention, the non-magnetic stator core is formed by laminating non-magnetic thin epoxy plates.
As a preferred modification of the present invention, the projection of the dc excitation winding in the radial direction is at least partially overlapped with the left-side stator core and the right-side stator core.
As a preferable improvement of the present invention, the inner magnetic bridge includes an annular flat plate-like body portion and protruding portions extending from the body portion along opposite sides thereof and abutting against the left rotor core and the right rotor core, respectively.
As a preferable improvement of the present invention, the number of the permanent magnets is plural, and the plural permanent magnets are embedded in the rotor core in the radial direction.
As a preferable modification of the present invention, the left rotor core and the right rotor core are both tangential rotor cores.
As a preferable modification of the present invention, the left side stator core and the right side stator core are each laminated stator cores.
As a preferable improvement of the present invention, the outer magnetic bridge connects the left side stator core and the right side stator core, and the inner magnetic bridge connects the left side rotor core and the right side rotor core, and the outer magnetic bridge and the inner magnetic bridge are added with an air gap to constitute an axially closed magnetic circuit.
The beneficial effects of the invention are as follows:
1. by placing the direct current excitation winding on the stator side, a brushless structure is realized;
2. the permanent magnets are arranged on the rotor side, and a tangential permanent magnet installation mode is adopted, so that the power density of the magnetic flux under one magnetic pole is further increased and the magnetic flux under one magnetic pole is better in output performance because the magnetic fluxes under one magnetic pole are generated by the permanent magnets on the two sides;
3. the magnetic circuits of the electric excitation and the permanent magnet excitation are in parallel connection, so that the demagnetizing risk of the permanent magnet is effectively avoided, an additional air gap is not arranged on the electric excitation magnetic circuit, and the magnetic resistance is reduced to reduce the excitation current, so that the copper consumption of the excitation winding is reduced;
4. the electric excitation magnetic potential only passes through the main air gap of the motor and does not pass through other additional air gaps, so that the magnetic resistance of the magnetic circuit is small, and the excitation current is effectively reduced;
5. by arranging the inner magnetic bridge, the axial inner magnetic circuit can be formed with the left rotor core and the right rotor core, and the heat dissipation of the rotor core is facilitated, so that the high-temperature demagnetization resistance of the permanent magnet is improved;
6. the direct-current excitation winding is arranged in the accommodating cavity, so that the aim of changing main magnetic flux under the action of electric excitation can be fulfilled, and good magnetic regulation performance is obtained;
7. by installing the DC exciting winding in the outer magnetic bridge close to the motor casing, the brushless structure can be realized, and the heat dissipation performance can be enhanced.
Drawings
For a clearer description of the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:
FIG. 1 is a cross-sectional structure diagram of a parallel brushless hybrid excitation motor based on a double magnetic bridge of the present invention;
FIG. 2 is an axial explosion structure diagram of a parallel brushless hybrid excitation motor based on double magnetic bridges;
FIG. 3 is a magnetic circuit diagram of a parallel brushless hybrid excitation motor based on double magnetic bridges;
FIG. 4 is a three-dimensional view of the air gap flux density of the invention in the-4000 AT electro-magnetic state;
FIG. 5 is a three-dimensional view of the air gap flux density of the invention in 4000AT electrical excitation;
fig. 6 is a graph of line back electromotive force of the parallel brushless hybrid excitation motor based on the double magnetic bridges in the present invention when no load occurs;
FIG. 7 is a graph of the A-phase flux linkage of the parallel brushless hybrid excitation motor based on the double magnetic bridges in the invention when no load exists;
fig. 8 is a graph of output torque of the parallel brushless hybrid excitation motor based on the double magnetic bridges in different electric excitation states.
Detailed Description
The technical solutions of the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
Referring to fig. 1 and 2, the present invention provides a parallel brushless hybrid excitation motor based on double magnetic bridges, which comprises a left stator core 1, an outer magnetic bridge 2, a dc excitation winding 3, a non-magnetic stator core 4, a right stator core 5, a rotating shaft 6, a permanent magnet 7, a left rotor core 8, an inner magnetic bridge 9, an armature winding 10 and a right rotor core 11.
The left rotor core 8, the inner magnetic bridge 9 and the right rotor core 11 are sequentially connected to form a rotor core, and the rotor core is fixedly sleeved on the rotating shaft 6 and synchronously rotates along with the rotating shaft 6.
Specifically, the left rotor core 8 and the right rotor core 11 are tangential rotor cores.
The left side stator core 1, the non-magnetic conductive stator core 4 and the right side stator core 5 are sequentially connected to form a stator core, and the stator core is sleeved on the rotor core at intervals, namely, the rotor core can rotate relative to the stator core.
Specifically, the left stator core 1 and the right stator core 5 are both laminated stator cores.
The inner magnetic bridge 9 connects the left rotor core 8 and the right rotor core 11 on both sides to form an axial inner magnetic circuit.
The outer magnetic bridge 2 is fixedly sleeved on the stator core, a containing cavity surrounding the stator core is formed in the outer magnetic bridge 2, and the direct-current excitation winding 3 is assembled in the containing cavity and surrounds the outer side of the stator core.
Specifically, the direct-current excitation winding 3 is projected in the radial direction so as to overlap at least partially with the left stator core 1 and the right stator core 5. In this way, the dc excitation winding 3 is enclosed in the hollow space between the outer magnetic bridge 2 and the left and right stator cores 1 and 5, and the generated magnetic flux forms a closed loop in the inner and outer magnetic circuits in the axial direction and the air gaps on both sides, so that the purpose of changing the main magnetic flux by the action of the electric excitation can be achieved, and good magnetic regulation performance can be obtained.
The outer magnetic bridge 2 connects the left stator core 1 and the right stator core 5 on both sides to form an axial outer magnetic circuit.
The non-magnetic conductive stator core 4 is formed by laminating non-magnetic conductive thin epoxy plates.
The permanent magnets 7 are embedded in the rotor core, specifically, the number of the permanent magnets 7 is multiple, and the permanent magnets 7 are embedded in the rotor core along the radial direction.
The inner magnetic bridge 9 includes an annular flat plate-like body portion and protruding portions extending from the body portion along opposite sides thereof and abutting against the left rotor core 8 and the right rotor core 11, respectively.
The armature winding 10 is embedded in the stator core.
As shown in fig. 3, each magnetic circuit of the parallel brushless hybrid excitation motor based on the double magnetic bridges provided by the invention is characterized in that a permanent magnet 7 generates main magnetic flux and leakage magnetic flux, and the main magnetic flux passes through the permanent magnet 7, a left rotor core 8, a right rotor core 11, an air gap, a left stator core 1 and a right stator core 5 to form a main magnetic flux magnetic circuit 15, which directly influences the output performance of the motor. Leakage flux generally occurs at the corners of the permanent magnet 7. The permanent magnet 7 has an axial magnetic flux penetrating through the inner and outer magnetic bridges, called bypass magnetic flux, and as shown by reference numerals 13 and 14 in fig. 3, the magnetic resistance of the magnetic circuit is slightly larger than that of the main magnetic circuit but smaller than that of the leakage magnetic circuit, and the magnetic flux is a leakage magnetic flux, and thus, attention is paid particularly.
When the direct current exciting winding 3 is electrified, the direct current exciting winding can be divided into a magnetizing state and a demagnetizing state according to the different directions of the electrified current, and the magnetizing state and the demagnetizing state correspond to the increase and the decrease of the main magnetic flux respectively. As shown in fig. 3, a magnetic circuit 12 through which the electrically excited magnetic potential generates magnetic flux penetrates the outer magnetic bridge 2, the inner magnetic bridge 9, and the left-side stator core 1, the right-side stator core 5, the left-side rotor core 8, and the right-side rotor core 11.
The principle that the electromagnetic excitation energy can generate the demagnetization is as follows: the motor is divided into a left part and a right part by taking the outer magnetic bridge 2 and the inner magnetic bridge 9 as boundaries, and the electric excitation magnetic flux starts from one pole at the left part, passes through the outer magnetic bridge 2 to reach the opposite pole at the right part, and then passes through the inner magnetic bridge 9 to form a closed magnetic circuit. In the running process of the motor, the purposes of outputting large torque at low speed and increasing the rotating speed range after field weakening are achieved by changing the direction and current of the current in the direct-current excitation winding 3. It is noted that the bypass magnetic flux is offset from each other in the left and right parts of the same pole after passing through the outer magnetic bridge 2 and the inner magnetic bridge 9, and does not affect the main magnetic flux.
The parallel brushless hybrid excitation motor based on the double magnetic bridges provided by the invention is respectively subjected to static field and transient field analysis, and is specifically as follows:
1. static field analysis results
And (3) establishing a motor model by using three-dimensional finite element software, and firstly calculating the air gap flux density after the action of three different electric excitation states under the condition of no-load of the motor in a static field, as shown in figures 4 and 5. As can be seen from the graph, when the electric excitation is-4000 AT, namely, in a demagnetizing state, the average value of the air gap flux density of the left part in the axial direction under one pole of the motor is slightly increased, but the average value on the right side is greatly reduced, and the total amount of main magnetic flux is reduced; when the electric excitation is 4000AT, namely in a magnetization state, the average value of the air gap flux density of the left part of the lower shaft of one pole of the motor is slightly reduced, but the increase amplitude of the right average value is larger, and the total amount of main magnetic flux is increased.
2. Transient field analysis results
In the no-load condition, the rated rotation speed of the motor is 2000rpm, and the electric excitation is F respectively i = -4000AT and F i In the case of=4000 AT, the line back emf and a-phase flux linkage curves obtained by finite element simulation are shown in fig. 6 and 7. Wherein, the electric excitation F i When the temperature is between the range from-4000 AT, the fundamental wave amplitude of the back electromotive force of the wire is 110.01V, and the electric excitation F is realized i When=4000 AT, the fundamental wave amplitude of the line back emf is 140.67V, and the amplitude variation is about 27.88%.
Under the condition of motor load, given electric excitation is F respectively i ＝-4000AT、F i ＝0AT、F i When=4000 AT, the average output torque values of the hybrid excitation motor are 4.55Nm, 4.15Nm, and 3.62Nm, respectively, as shown in fig. 8. The motor is characterized in that the motor is provided with a motor torque calculation formula, wherein the motor torque calculation formula is used for calculating the motor torque according to the motor torque calculation formula. In the rotor coordinate system, the combined action of the change in the state of the electrical excitation and the application of a negative Id current can thus widen the range of torque and rotational speed.
The beneficial effects of the invention are as follows:
1. by placing the direct current excitation winding on the stator side, a brushless structure is realized;
2. the permanent magnets are arranged on the rotor side, and a tangential permanent magnet installation mode is adopted, so that the power density of the magnetic flux under one magnetic pole is further increased and the magnetic flux under one magnetic pole is better in output performance because the magnetic fluxes under one magnetic pole are generated by the permanent magnets on the two sides;
3. the magnetic circuits of the electric excitation and the permanent magnet excitation are in parallel connection, so that the demagnetizing risk of the permanent magnet is effectively avoided, an additional air gap is not arranged on the electric excitation magnetic circuit, and the magnetic resistance is reduced to reduce the excitation current, so that the copper consumption of the excitation winding is reduced;
4. the electric excitation magnetic potential only passes through the main air gap of the motor and does not pass through other additional air gaps, so that the magnetic resistance of the magnetic circuit is small, and the excitation current is effectively reduced;
5. by arranging the inner magnetic bridge, the axial inner magnetic circuit can be formed with the left rotor core and the right rotor core, and the heat dissipation of the rotor core is facilitated, so that the high-temperature demagnetization resistance of the permanent magnet is improved;
6. the direct-current excitation winding is arranged in the accommodating cavity, so that the aim of changing main magnetic flux under the action of electric excitation can be fulfilled, and good magnetic regulation performance is obtained;
7. by installing the direct-current excitation winding in the outer magnetic bridge close to the motor shell, the brushless structure can be realized, and the heat dissipation performance can be enhanced;
8. the output torque of the motor at low speed is increased, and the rotating speed range of the motor is enlarged.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (6)
1. The parallel brushless hybrid excitation motor based on the double magnetic bridges is characterized by comprising a left stator core, an outer magnetic bridge, a direct current excitation winding, a non-magnetic stator core, a right stator core, a rotating shaft, a permanent magnet, a left rotor core, an inner magnetic bridge, an armature winding and a right rotor core, wherein,
the left rotor core, the inner magnetic bridge and the right rotor core are sequentially connected to form a rotor core, and the rotor core is fixedly sleeved on the rotating shaft and synchronously rotates along with the rotating shaft;
the left side stator core, the non-magnetic stator core and the right side stator core are sequentially connected to form a stator core, and the stator core is sleeved on the rotor core at intervals;
the outer magnetic bridge is fixedly sleeved on the stator core and is jointly fixed on the shell, a containing cavity which is arranged around the stator core is formed in the outer magnetic bridge, and the direct-current excitation winding is assembled in the containing cavity and surrounds the outer side of the stator core;
the projection of the direct current excitation winding along the radial direction is at least partially overlapped with the left side stator core and the right side stator core;
the non-magnetic conductive stator core is formed by laminating non-magnetic conductive thin epoxy plates; the permanent magnet is embedded in the rotor core;
the armature winding is embedded in the stator core.
2. A parallel brushless hybrid excitation motor based on double magnetic bridges as claimed in claim 1, wherein: the inner magnetic bridge includes a circular ring-shaped flat plate-shaped body portion and protruding portions extending from the body portion along opposite sides thereof, respectively, and abutting against the left rotor core and the right rotor core, respectively.
3. A parallel brushless hybrid excitation motor based on double magnetic bridges as claimed in claim 2, wherein: the number of the permanent magnets is multiple, and the permanent magnets are embedded in the rotor core along the radial direction.
4. A parallel brushless hybrid excitation motor based on double magnetic bridges as claimed in claim 3, wherein: the left rotor core and the right rotor core are tangential rotor cores.
5. A parallel brushless hybrid excitation motor based on double magnetic bridges as claimed in claim 1, wherein: the left side stator core and the right side stator core are laminated stator cores.
6. A parallel brushless hybrid excitation motor based on double magnetic bridges as claimed in claim 1, wherein: the outer magnetic bridge is connected with the left side stator core and the right side stator core, the inner magnetic bridge is connected with the left side rotor core and the right side rotor core, and an air gap is formed between the outer magnetic bridge and the inner magnetic bridge, so that an axial closed magnetic circuit is formed.
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