CN204046376U - A kind of E shape tooth birotor Magneticflux-switching type magneto - Google Patents

Abstract

The utility model discloses an E-shaped double-rotor magnetic flux switching permanent magnet motor, which comprises an outer stator, an intermediate rotor and an inner rotor. There are air gaps between the intermediate rotor, the inner rotor and the outer stator, and the intermediate rotor is double convex. The pole structure, the outer stator and the inner rotor both include a number of E-shaped magnetic cores, permanent magnets and armature windings. Both ends and the middle of the E-shaped magnetic core are equipped with core teeth, and the permanent magnets are clamped between two adjacent E. Between the core teeth at one end of the magnetically conductive core, the armature winding is wound on the permanent magnet and the two core teeth for clamping the permanent magnet. The magnetization directions of the two adjacent permanent magnets are opposite, and the inner rotor is socketed On the shaft of the inner rotor, a magnetic isolation sleeve is provided between the inner rotor and the shaft of the inner rotor. The armature winding is composed of multi-phase symmetrically distributed concentrated windings, and the structure of the armature windings of each phase is the same. The utility model can effectively reduce the consumption of permanent magnets, and the reliability of the motor is high.

Description

An E-shaped double-rotor flux-switching permanent magnet motor

technical field

The utility model belongs to the field of motors, and relates to a permanent magnet motor, in particular to an E-shaped tooth double rotor magnetic flux switching permanent magnet motor.

Background technique

At present, the world is facing environmental deterioration and oil shortage, and internal combustion engine vehicles are one of the important reasons for this harm. In order to improve the living environment of human beings and reduce the pressure of oil shortage, energy saving and emission reduction are the development trend of automobile technology in the future. Hybrid electric vehicles have become one of the development directions due to their advantages of high efficiency and low emission.

At present, the most influential hybrid system is the hybrid hybrid system, which is a structure in which two motors are connected to the engine through planetary gears to realize the speed, torque coupling and distribution of the battery pack and the internal combustion engine. Make the system work in the efficient area. However, transmission devices using planetary gears have disadvantages in terms of noise, efficiency, reliability, and price, and all require long-term regular maintenance. In recent years, researchers have proposed an electronically controlled continuously variable transmission device based on a dual-rotor motor, which eliminates the planetary gear mechanism and makes the structure simpler and more compact. This electronically controlled continuously variable transmission is actually an energy converter composed of two motors. The integrated motor contains three parts: a stator and two rotors, and each rotor has an independent output shaft. , respectively connect the engine and the drive shaft, and the two motors are used to adjust the speed difference and torque difference between the engine and the drive shaft, so as to realize the simultaneous control of the engine speed and torque, so that the engine can work at the optimal speed at the same time And the best torque point, that is, the state of high efficiency and low emission, so that the hybrid vehicle can keep the internal combustion engine working at high efficiency and the best fuel economy state under various load conditions, so the electronically controlled continuously variable transmission based on the dual-rotor motor The device has gradually become a research hotspot of hybrid electric vehicles. The advantages of high power density of permanent magnet motors and the increasingly reasonable price of permanent magnet materials have made permanent magnet dual rotor motors more and more widely used in hybrid electric vehicles.

At present, the mainstream permanent magnet dual-rotor motor has a structure in which both the outer stator and the inner rotor are embedded with windings, and the middle rotor is mounted with permanent magnets. However, mounting permanent magnets on both the inside and outside of the intermediate rotor will lead to the disadvantages of difficult heat dissipation and weakened mechanical strength of the permanent magnets.

The stator permanent magnet double rotor flux switching motor combines the structural characteristics of the conventional flux switching permanent magnet motor, and the permanent magnets are built in the stator and the inner rotor, so that there are neither permanent magnets nor windings on the intermediate rotor, and the heat dissipation requirements are low. And the mechanical strength is strengthened. However, according to the research results of flux switching permanent magnet motors, placing permanent magnets in the outer stator and inner rotor will increase the amount of permanent magnets, increase the cost, and reduce the slot area, thereby limiting the torque density; more permanent magnets The amount of magnets also increases the eddy current losses on the permanent magnets. Therefore, a key technology in the design of the stator permanent magnet dual rotor motor is to reduce the amount of permanent magnets under the premise of ensuring performance.

Utility model content

The purpose of the utility model is to overcome the above-mentioned shortcoming of the prior art, and provide an E-shaped double-rotor magnetic flux switching permanent magnet motor, and the amount of permanent magnets in the motor is small.

In order to achieve the above purpose, the E-shaped tooth double rotor flux switching permanent magnet motor described in the utility model includes an outer stator, an inner rotor shaft, an intermediate rotor and an inner rotor, and there are air gap, the intermediate rotor is a double salient pole structure, the outer stator and the inner rotor both include a number of E-shaped magnetic cores, permanent magnets and armature windings, both ends and the middle of the E-shaped magnetic core are equipped with core teeth, permanent magnet clips The armature winding is wound on the permanent magnet and the two core teeth used to clamp the permanent magnet, and the magnetization of the two adjacent permanent magnets In the opposite direction, the inner rotor is sleeved on the inner rotor shaft, and a magnetic isolation sleeve is provided between the inner rotor and the inner rotor shaft. The armature winding is composed of multi-phase symmetrically distributed concentrated windings, and the structure of each phase armature winding is the same.

The armature winding is a three-phase concentrated winding, each phase of the armature winding includes two coils, and the spatial positions of the phases of the armature winding are 60° from each other.

An excitation winding coil is wound on the iron core teeth at the center of the E-shaped permeable magnetic core.

The intermediate rotor has a straight slot structure or a skewed slot structure.

Both the outer stator and the inner rotor include six E-shaped permeable cores.

The utility model has the following beneficial effects:

The E-shaped tooth double-rotor flux switching permanent magnet motor described in the utility model includes an outer stator, an intermediate rotor and an inner rotor. The outer stator and the inner rotor include a plurality of E-shaped magnetic cores, permanent magnets and armature windings. It is clamped between the iron core teeth at one end of two adjacent E-shaped conductive cores. The armature winding is wound on the permanent magnet and the two core teeth used to clamp the permanent magnet. The core in the middle of the E-shaped conductive core The teeth are not embedded with permanent magnets, thereby effectively reducing the amount of permanent magnets used. The armature winding is composed of multi-phase symmetrically distributed centralized windings, simple winding and embedded assembly, short winding ends and low copper loss, which is conducive to improving the working efficiency of the motor. The utility model has two modes of permanent magnet excitation and electric excitation. When one excitation mode fails, the other excitation mode can ensure the normal operation of the motor, thereby improving the reliability of the motor. In addition, the electric excitation magnetic field is used to intensify or demagnetize the excitation field of the permanent magnet. Magnetization is beneficial to increase the torque, and demagnetization is beneficial to increase the speed range. There is neither permanent magnet nor winding on the intermediate rotor, which is beneficial to the heat dissipation of the motor. and high-speed operation.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the structure schematic diagram when the field winding coil 7 is not wound on the iron core teeth in the middle part of the E-shaped magnetic core 6 in the utility model;

Fig. 3 is the structure diagram when the core teeth in the middle part of the E-shaped magnetic core 6 are wound with the field winding coil 7 in the utility model;

Fig. 4 is the distribution of the magnetic field lines under the action of the permanent magnet 4 in the outer stator 1 of the utility model alone;

Fig. 5 is the distribution of the magnetic field lines under the action of the permanent magnet 4 in the inner rotor 3 in the utility model alone;

Fig. 6 shows the distribution of magnetic force lines under the action of the inner rotor 3 and the permanent magnet 4 in the outer stator 1 in the present invention.

Among them, 1 is the outer stator, 2 is the intermediate rotor, 3 is the inner rotor, 4 is the permanent magnet, 5 is the armature winding, 6 is the E-shaped magnetic core, 7 is the excitation winding coil, 8 is the magnetic isolation sleeve, and 9 is the Inner rotor shaft.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

With reference to Fig. 1, Fig. 2 and Fig. 3, the permanent magnet motor of the E-shaped tooth double-rotor flux switching type described in the utility model comprises an outer stator 1, an inner rotor shaft 9, an intermediate rotor 2 and an inner rotor 3, and the intermediate rotor 2 and There is an air gap between the inner rotor 3 and the outer stator 1, the intermediate rotor 2 is a double salient pole structure, the outer stator 1 and the inner rotor 3 both include a number of E-shaped magnetic cores 6, permanent magnets 4 and armature windings 5, E The two ends and the middle part of the shape conductive core 6 are all provided with iron core teeth, and the permanent magnet 4 is clamped between the iron core teeth at one end of two adjacent E-shaped magnetic conductive cores 6, and the armature winding 5 is wound on the permanent magnet 4 and used On the two iron core teeth clamping the permanent magnet 4, the magnetization directions of the two adjacent permanent magnets 4 are opposite, the inner rotor 3 is sleeved on the inner rotor shaft 9, and the inner rotor 3 and the inner rotor shaft are provided with There is a magnetic isolation sleeve 8, and the armature winding 5 is composed of multi-phase symmetrically distributed concentrated windings, and the structure of the armature winding 5 of each phase is the same.

It should be noted that the armature winding 5 is a three-phase concentrated winding, and each phase of the armature winding 5 includes two coils. The rotors 3 each include six E-shaped magnetically conductive cores 6 , and the inner rotor shaft 9 cools the inner rotor 3 through water cooling or oil cooling during operation.

The intermediate rotor 2 has a straight-slot structure or an inclined-slot structure. Generally, a straight-slot structure is adopted. When the torque ripple and noise caused by harmonics are serious, the inclined-slot structure is adopted.

Compared with the conventional stator permanent magnet double-rotor flux switching motor, the utility model does not insert the permanent magnet 4 in the iron core teeth in the middle of the E-shaped magnetic core 6, which can effectively reduce the consumption of the permanent magnet 4. In addition, when the core teeth in the middle of the E-shaped conductive core 6 in the outer stator 1 and the inner rotor 3 are not wound around the excitation winding coil 7, the permanent magnet 4 alone provides the excitation magnetic field; when the E in the outer stator 1 and the inner rotor 3 When the iron core teeth in the middle of the magnetically permeable core 6 are wound around the excitation winding coil 7, the permanent magnet 4 and the excitation winding coil 7 provide an excitation magnetic field together, and the resulting magnetic field is regulated by adjusting the magnitude of the electric excitation current.

In addition, the coordination of 1 pole of the outer stator/2 poles of the intermediate rotor/3 poles of the inner rotor can be freely combined according to needs. The number of poles/inner rotor 3 poles can be reasonably matched to reduce, and the mutual cooperation of poles can also increase the torque density of the motor, which is very beneficial to the power system of hybrid electric vehicles. Therefore, through the external stator 1/intermediate The coordination of rotor 2/inner rotor 3 poles and the global optimization of main design parameters, under the condition of fixed copper loss, realize the balance and symmetry of the back EMF waveform and the maximum torque density.

Embodiment one

This embodiment takes a three-phase stator with 6 poles/intermediate rotor with 10 poles/inner rotor with 6 poles as an example. Referring to FIG. 1, the E-tooth double rotor flux The switched permanent magnet motor includes an outer stator 1, an intermediate rotor 2 and an inner rotor 3. The intermediate rotor 2 has a double salient pole structure. There is an air gap between the intermediate rotor 2, the outer stator 1, and the inner rotor 3. The rotor 3 is composed of 6 E-shaped magnetic cores, 6 permanent magnets 4 and 6 armature windings 5. The two ends and the middle of the E-shaped magnetic core 6 are equipped with iron core teeth, and the permanent magnets 4 are clamped in the phase. Between the iron core teeth at one end of two adjacent E-shaped magnetic conductive cores 6, tangential magnetization is carried out, and the magnetization direction of two adjacent permanent magnets 4 is opposite; the six armature windings 5 are respectively assembled in the embedding according to the phase sequence of A-B-C There are 6 iron core teeth of permanent magnet 4, forming three-phase symmetrically distributed concentrated windings, each phase of armature winding 5 contains 2 coils, and the core teeth in the middle of E-shaped magnetic core 6 are not wound around armature winding 5, only The excitation magnetic field is provided by the permanent magnet 4 .

Referring to Fig. 4, Fig. 5 and Fig. 6, the distribution of magnetic force lines of the present invention follows the "principle of minimum reluctance". When the permanent magnets 4 of the outer stator 1 act alone, few magnetic force lines flow through the inner rotor 3; when the inner rotor 3 sub-permanent magnets 4 act alone, few magnetic force lines flow through the outer stator 1, indicating that the electromagnetic field coupling degree of the inner and outer motors is very small. It is beneficial to realize the independent control of the internal and external motors and meet the requirements of hybrid electric vehicles in various working conditions.

Claims (5)

1. an E shape tooth birotor Magneticflux-switching type magneto, it is characterized in that, comprise external stator (1), internal rotor rotating shaft (9), center roller (2) and internal rotor (3), all air gap is there is between center roller (2) and internal rotor (3) and external stator (1), center roller (2) is double-salient-pole structure, external stator (1) and internal rotor (3) include some E shape magnetic conductive iron (6), permanent magnet (4) and armature winding (5), two ends and the middle part of E shape magnetic conductive iron (6) are equipped with core tooth, permanent magnet (4) is held between the core tooth of adjacent two E shape magnetic conductive iron (6) one end, armature winding (5) is wound in permanent magnet (4) and two core tooth for clamping described permanent magnet (4), the magnetizing direction of two adjacent permanent magnets (4) is contrary, internal rotor (3) is socketed in internal rotor rotating shaft (9), magnetic shield (8) is provided with between internal rotor (3) and internal rotor rotating shaft, armature winding (5) is made up of heterogeneous symmetrical centralized winding, the structure of each phase armature winding (5) is identical.

2. E shape tooth birotor Magneticflux-switching type magneto according to claim 1, it is characterized in that, described armature winding (5) is three-phase set Chinese style winding, every phase armature winding (5) all comprises 2 coils, each phase armature winding (5) mutual deviation 60 ° on locus.

3. E shape tooth birotor Magneticflux-switching type magneto according to claim 1, is characterized in that, the core tooth at described E shape magnetic conductive iron (6) middle part is wound with excitation winding pole coil (7).

4. E shape tooth birotor Magneticflux-switching type magneto according to claim 1, it is characterized in that, described center roller (2) is straight groove structure or flume structure.

5. E shape tooth birotor Magneticflux-switching type magneto according to claim 1, it is characterized in that, described external stator (1) and internal rotor (3) include 6 E shape magnetic conductive iron (6).