CN108110992A - A kind of translation ring-like built-in type permanent-magnet eddy speed regulating device of stator - Google Patents

Abstract

The invention discloses a built-in permanent magnet eddy current speed regulating device with translational stator ring. The device comprises an input shaft (1) and an output shaft (2) arranged coaxially. type permanent magnet rotor (3), a stator ring (4) capable of axial translation is arranged on the outer circumference of the built-in permanent magnet rotor (3) coaxially; a conductor rotor (5) is arranged coaxially on the output shaft (2) ; The conductor rotor is composed of a copper layer with good conductivity fixed on the conductor rotor core, and the copper layer is facing the inner side of the permanent magnet rotor. The stator ring is made of ferromagnetic material with good magnetic permeability, and surrounds the permanent magnet rotor, with an air gap between it and the permanent magnet rotor. The invention can realize the flexible adjustment of the air gap magnetic field between the permanent magnet rotor and the conductor rotor by controlling the change of the axial relative position between the non-rotating stator ring and the permanent magnet rotor, and finally realize the operation with a wide speed regulation range.

Description

A built-in permanent magnet eddy current speed regulating device with translational stator ring

technical field

The invention belongs to the technical field of electric motor manufacturing, and relates to a built-in permanent magnet eddy current speed regulating device with translational stator ring.

Background technique

With the promotion and application of high-performance permanent magnet materials, the permanent magnet speed control technology, which has developed rapidly, is a new type of speed control and energy-saving technology for motor drive systems applied between the prime mover and the load. The speed-regulating permanent magnet coupler has a good energy-saving effect, reduces operating costs, and can also realize the soft start and soft stop functions of the motor. It can operate in harsh environments such as flammable, explosive, humid, and high dust content, and it is a mechanical structure that can adapt to situations such as unstable power grid quality and impact loads caused by current changes. The application of permanent magnet transmission technology has a history of several decades. Its application is to realize the non-contact transmission of torque between the prime mover and the load through magnetic field coupling. Mainly used in the chemical industry, petrochemical industry, coal cement, metallurgy, steel, ships and many other fields of motor drive system speed regulation and energy saving of high-power fan pump loads.

According to the main flux direction of the permanent magnet eddy current speed regulating device, it can be divided into two categories: axial flux structure (disc type) and radial flux structure (drum type). The permanent magnet speed control device with axial magnetic flux structure usually adjusts the axial air gap length between the magnetic rotor and the conductor rotor to control the size of the air gap magnetic field, and then control the operating speed of the load side. The permanent magnet eddy current speed regulating device with radial flux structure usually controls the speed of the load side by changing the coupling area between the conductor rotor and the permanent magnet rotor.

At present, quite a few products have been applied to industrial practice, and some of them can realize online speed regulation. The permanent magnet eddy current speed regulating devices of the above two structures all need to translate the permanent magnet rotor or the conductor rotor along the axial direction through the electric actuator. Because it is difficult to adjust the relative axial positions of the two rotors, especially for the axial structure, there is considerable axial magnetic pulling force between the magnetic rotor and the conductor rotor. As a result, the structure of the electric actuator is complicated, the mechanical strength is high, and the occupied space is relatively large. Therefore, it is necessary to improve the magnetic regulation method of the traditional permanent magnet eddy current speed regulating device.

Contents of the invention

Technical problem: The technical problem to be solved by the present invention is to provide a built-in permanent magnet eddy current speed control device with a translational stator ring. The traditional permanent magnet eddy current speed control device realizes the device by changing the axial relative position of the permanent magnet rotor and the conductor rotor. speed control function. The structure of the electric actuator is complicated, the mechanical strength is high, the online speed adjustment is difficult, and the stability and reliability are poor.

Technical solution: A translational stator ring type built-in permanent magnet eddy current speed regulating device of the present invention includes an input shaft and an output shaft arranged coaxially, and a built-in permanent magnet rotor is arranged coaxially on the input shaft. The outer circumference of the rotor is coaxially provided with a stator ring capable of axial translation; the output shaft is coaxially provided with a conductor rotor;

The built-in permanent magnet rotor includes multiple tangentially magnetized permanent magnets, multiple permanent magnet rotor cores, and an auxiliary structure for fixing the permanent magnet rotor cores and permanent magnets. The permanent magnets and permanent magnet rotor cores are arranged alternately on the inner side of the stator ring. on the auxiliary structure;

The conductor rotor includes a copper layer and a conductor rotor core, and the copper layer is fixed on the outer circumference of the conductor rotor core; the conductor rotor core is fixed on the outer circumference of the output shaft, and the conductor rotor is located inside the permanent magnet rotor core and the permanent magnet in the built-in permanent magnet rotor.

in,

The air gap length and axial position between the built-in permanent magnet rotor and the conductor rotor are fixed.

The length of the air gap between the axially translatable stator ring and the permanent magnet rotor is constant, and the length of the air gap should be as small as possible.

During the axial translation of the stator ring covering the permanent magnet rotor, the permanent magnet flux of the built-in permanent magnet rotor is short-circuited by the stator ring, and as the area covered by the stator ring increases, the permanent magnet flux of the stator ring short-circuits As the capacity increases, the air gap magnetic field between the built-in permanent magnet rotor and the conductor rotor weakens, and vice versa, the air gap magnetic field increases.

The stator ring is made of silicon steel sheets laminated in the axial direction to reduce core loss of the stator ring.

Beneficial effects: the structure of the operating mechanism can be simplified by adopting the novel magnetic adjustment method, the maintenance cost can be reduced, the service life can be prolonged, the structure is simple, the operation is convenient, and the online speed regulation is more stable and reliable. For a given load torque, the change in the air gap magnetic field results in a change in the slip speed. Therefore, under the condition that the input speed is constant, the load speed can be adjusted flexibly online with the axial translation of the stator ring. In addition, the operating mechanism required for translating the stator ring is simpler in structure, higher in stability, and lower in mechanical strength requirements than the operating mechanism required for translating the conductor rotor or the permanent magnet rotor.

Description of drawings

Fig. 1 is the sectional schematic diagram of the built-in permanent magnet eddy current speed regulating device of translational stator ring type in the embodiment;

Fig. 2 is the two-dimensional magnetic flux path diagram of the built-in permanent magnet eddy current speed regulating device of the translating stator ring type in the embodiment;

Fig. 3 is an exploded schematic diagram of the three-dimensional structure of the built-in permanent magnet eddy current speed regulating device of the translational stator ring of the embodiment;

Among them, input shaft 1, output shaft 2, built-in permanent magnet rotor 3, stator ring 4, conductor rotor 5, permanent magnet 6, permanent magnet rotor core 7, auxiliary mechanism 8, copper layer 9, conductor rotor core 10, conductor rotor Auxiliary mechanism 11 , cooling holes 12 at the end of the permanent magnet rotor, cooling holes 13 at the end of the conductor rotor, a modulation magnetic circuit 14 , a main magnetic circuit 15 , and an outer air gap 16 .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

As shown in Figures 1 and 3, a built-in permanent magnet eddy current speed regulating device with a translational stator ring includes an input shaft 1 and an output shaft 2 arranged concentrically. The magnetic rotor 3 and the axially translatable stator ring 4 are provided. The output shaft 2 is provided with a conductor rotor 5 facing the inner side of the built-in permanent magnet rotor 3 . In addition, there is an air gap as small as possible between the built-in permanent magnet rotor 3 and the stator ring 4 , and the air gap length and axial relative position between the built-in permanent magnet rotor 3 and the conductor rotor 5 are fixed.

The permanent magnet rotor 3 is formed by tangentially magnetized permanent magnets 6 embedded in the permanent magnet rotor core 7 , and fixed together with the input shaft 1 by the non-magnetic conduction auxiliary mechanism 8 . In addition, as shown in FIG. 3 , a cooling hole 12 is left on the upper end of the non-magnetic conduction auxiliary mechanism 8 .

The conductor rotor 5 includes a copper layer 9 and a conductor rotor core 10 , and the copper layer 9 is fixed on the conductor rotor core 10 . As shown in FIG. 3 , the auxiliary mechanism 11 fixes the output shaft 2 and the conductor rotor 5 , and a cooling hole 13 is left on the end cover of the auxiliary mechanism 11 .

The stator ring 4 can translate along the axial direction of the input shaft 1 , and the stator ring 4 does not rotate with the input shaft 1 . As shown in FIG. 2 , the permanent magnet flux mainly flows through two flux paths of the modulating magnetic circuit 14 and the main magnetic circuit 15 . The modulation magnetic circuit 14 starts from the permanent magnet 6, passes through the permanent magnet rotor core 7, the outer air gap 16, the stator ring 4, and the permanent magnet rotor core 7 on the other side of the permanent magnet 6, and forms a magnetic flux circuit with the permanent magnet 6; The main magnetic circuit 15 starts from the permanent magnet 6, passes through the permanent magnet rotor core 7, the inner air gap, the copper layer 9, the conductor rotor core 10, the copper layer 9, the permanent magnet rotor core 7 on the other side of the permanent magnet 6, and is connected with The permanent magnets 6 form a magnetic flux circuit. When the stator ring 4 translates in the axial direction, the permanent magnet flux of the built-in permanent magnet rotor 3 is short-circuited by the stator ring 4 and flows along the modulation magnetic circuit 14 . As the stator ring 4 moves in the axial direction, the area of the stator ring 4 covering the built-in permanent magnet rotor 3 increases, the short-circuit effect is enhanced, the magnetic flux passing through the modulation magnetic circuit 14 increases, and at the same time, the magnetic flux passing through the main magnetic circuit 15 decreases. Therefore, the air gap magnetic field between the permanent magnet rotor 3 and the conductor rotor 5 is weakened. On the contrary, the air gap magnetic field between the built-in permanent magnet rotor 3 and the conductor rotor 5 is enhanced.

In the case of a given load torque, when the air gap magnetic field between the permanent magnet rotor 3 and the conductor rotor 5 weakens, the slip speed between the built-in permanent magnet rotor 3 and the conductor rotor 5 increases, and the load side speed decreases; otherwise , the load side speed increases. Therefore, by axially translating the stator ring 4, flexible adjustment of the load-side speed can be realized.

The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible, which fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.

Claims (7)

1. A translation stator ring type built-in permanent magnet eddy current speed regulating device is characterized in that: the device includes an input shaft (1) and an output shaft (2) arranged on a coaxial line, and the coaxial line on the input shaft (1) A built-in permanent magnet rotor (3) is arranged, and an axially translatable stator ring (4) is arranged on the outer circumference coaxial line of the built-in permanent magnet rotor (3); a conductor rotor (4) is arranged coaxially on the output shaft (2). 5); The built-in permanent magnet rotor (3) includes a plurality of tangentially magnetized permanent magnets (6), a plurality of permanent magnet rotor cores (7), and an auxiliary structure for fixing the permanent magnet rotor cores (7) and permanent magnets (6) ( 8), the permanent magnets (6) and the permanent magnet rotor cores (7) are arranged alternately on the auxiliary structure (8) inside the stator ring (4); The conductor rotor (5) includes a copper layer (9) and a conductor rotor core (10), and the copper layer (9) is fixed on the outer circumference of the conductor rotor core (10); the conductor rotor core (10) is fixed on the output shaft (2) Outer circumference, the conductor rotor (5) is located inside the permanent magnet rotor core (7) and the permanent magnet (6) in the built-in permanent magnet rotor (3); the conductor rotor auxiliary mechanism (11) is located next to the conductor rotor core (10). 2. The translational stator ring type built-in permanent magnet eddy current speed regulating device according to claim 1, characterized in that: the length of the air gap between the built-in permanent magnet rotor (3) and the conductor rotor (5) and the axial The position is fixed. 3. The translating stator ring type built-in permanent magnet eddy current speed regulating device according to claim 1, characterized in that: the length of the air gap between the axially translatable stator ring (4) and the permanent magnet rotor (3) constant, and the air gap length should be as small as possible. 4. The translating stator ring type built-in permanent magnet eddy current speed regulating device according to claim 1, characterized in that: when the stator ring (4) translates in the axial direction to cover the permanent magnet rotor (3), the built-in The permanent magnet flux of the permanent magnet rotor (3) is short-circuited by the stator ring (4). As the area covered by the stator ring (4) increases, the ability of the stator ring (4) to short-circuit the permanent magnet flux increases. The built-in The air gap magnetic field between the permanent magnet rotor (3) and the conductor rotor (5) is weakened, and vice versa, the air gap magnetic field is enhanced. 5. The translational stator ring type built-in permanent magnet eddy current speed regulating device according to claim 1, characterized in that: the stator ring (4) is made of silicon steel sheets laminated in the axial direction to reduce the core loss of the stator ring . 6. The translating stator ring type built-in permanent magnet eddy current speed regulating device according to claim 1, characterized in that: the conductor rotor auxiliary mechanism (11) is provided with conductor rotor end cooling holes (13). 7. The translating stator ring type built-in permanent magnet eddy current speed regulating device according to claim 1, characterized in that: said auxiliary structure (8) is provided with cooling holes (12) at the end of the permanent magnet rotor.