CN110868033B - Permanent magnet motor for inhibiting short circuit fault - Google Patents
Permanent magnet motor for inhibiting short circuit fault Download PDFInfo
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- CN110868033B CN110868033B CN201911160702.5A CN201911160702A CN110868033B CN 110868033 B CN110868033 B CN 110868033B CN 201911160702 A CN201911160702 A CN 201911160702A CN 110868033 B CN110868033 B CN 110868033B
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Abstract
The invention discloses a permanent magnet motor for inhibiting short-circuit faults, which comprises a base, an end cover, a rotating shaft penetrating through the end cover, a stator arranged on the base and a rotor arranged on the rotating shaft, wherein the rotor comprises a first rotor and a second rotor which are arranged in parallel, the rotating shaft is provided with a sleeve and an axial displacement device of the sleeve, the first rotor is fixed on the rotating shaft, the second rotor is arranged on the rotating shaft through the sleeve as a transmission part, and when the sleeve moves under the action of the axial displacement device of the sleeve, the second rotor can do 360 DEG/P limiting rotary displacement relative to the first rotor, wherein P is the number of poles of the motor. The permanent magnet motor for inhibiting the short-circuit fault can achieve the effects of inhibiting the short-circuit fault and being safely applied to rail transit and aviation.
Description
Technical Field
The invention relates to a permanent magnet motor for inhibiting short-circuit faults, in particular to a permanent magnet motor for rail transit and a permanent magnet motor for aviation, which have extremely high safety requirements on short-circuit faults.
Background
Compared with various other motors, the permanent magnet motor has very strong advantages in the aspects of high power density and high-efficiency operation. The existing experimental data show that the permanent magnet motor is used for replacing the commonly adopted asynchronous motor in rail transit (including railway main line electric locomotives, urban subways and light rails), the energy-saving effect can reach up to 30 percent, and the economic benefit is huge; however, because the permanent magnetic field of the permanent magnet motor is not controlled, once the armature winding has a short-circuit fault, the field cannot be removed to inhibit the short-circuit fault, so that serious potential safety hazard exists, and the application of the permanent magnet motor in rail transit is limited. Similarly, in the field of aviation where high power density and high efficiency motors are highly desirable, permanent magnet motors are also dare to be used because of this serious safety hazard. It is obvious how to restrain the short circuit fault, which becomes the key technical problem that the permanent magnet motor must solve in the application of the high safety requirement field.
Disclosure of Invention
In view of the defects of the existing permanent magnet motor, the invention provides the permanent magnet motor for inhibiting the short-circuit fault, which can achieve the effects of inhibiting the short-circuit fault and being safely applied to rail transit and aviation.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an restrain short-circuit fault's permanent-magnet machine, restrain short-circuit fault's permanent-magnet machine include frame, end cover, run through the pivot of end cover, set up stator on the frame and set up at the epaxial rotor of commentaries on classics, the rotor including the first rotor and the second rotor that set up side by side, the pivot on be provided with sleeve and telescopic axial displacement device, first rotor fix in the pivot, the second rotor pass through the sleeve and set up in the pivot as the driving medium, when the sleeve shifts out the second rotor under telescopic axial displacement device effect, 360 degrees/P's spacing rotary displacement can be done to first rotor relatively to the second rotor, wherein P is the number of poles of motor.
According to one aspect of the invention, a mutually matched limiting convex part and a limiting groove are arranged between the first rotor and the second rotor, the limiting convex part is embedded into the limiting groove and can generate displacement relative to the limiting groove, the maximum value of the displacement is that the second rotor and the first rotor form 360 degrees/P rotary displacement, and the limiting convex part and the limiting groove are respectively arranged on the first rotor and the second rotor or the limiting convex part and the limiting groove are respectively arranged on the second rotor and the first rotor. Through the mutual cooperation of spacing protruding piece and spacing groove, it is spacing to the relative rotation displacement between second rotor and the first rotor.
According to one aspect of the invention, the limiting convex part is an arc-shaped boss, the limiting groove is an arc-shaped groove, and the circumferential angle of the groove is the sum of the circumferential angle of the boss and the angle of 360 DEG/P.
According to one aspect of the invention, the limiting groove is provided with a first spring and a damper. The first spring is used for assisting the second rotor to rotate and displace relative to the first rotor, and the damper plays a role in damping during the rotation and displacement of the second rotor relative to the first rotor.
According to one aspect of the invention, the axial displacement means of the sleeve comprise a second spring arranged at one end on the end cap, an electromagnet and a thrust bearing arranged at the other end of the second spring. When the electromagnet is in an electrified state, the sleeve generates axial displacement, so that the second rotor is separated from transmission connection with the rotating shaft; and under the power-off state of the electromagnet, the sleeve is axially moved into the second rotor under the action of the second spring, and the sleeve restores the transmission connection between the second rotor and the rotating shaft.
In accordance with one aspect of the invention, the sleeve keys the second rotor and the shaft.
According to one aspect of the present invention, the sleeve is coupled to the rotary shaft and the second rotor using a key sleeve integrated structure or a key sleeve separated structure.
In accordance with one aspect of the invention, the sleeve is of a one-piece spline construction or a multi-key construction.
According to one aspect of the invention, the stator comprises a multiphase alternating current winding and a magnetic conductive iron core, the magnetic field structures of the first rotor and the second rotor are the same, and the magnetic steel arrangement of the rotors adopts an embedded magnetic steel arrangement or a surface-mounted magnetic steel arrangement.
In accordance with one aspect of the invention, the electromagnet is a solenoid electromagnet.
The implementation of the invention has the advantages that:
the invention discloses a permanent magnet motor for inhibiting short-circuit faults, which comprises a base, an end cover, a rotating shaft penetrating through the end cover, a stator arranged on the base and a rotor arranged on the rotating shaft, wherein the rotor comprises a first rotor and a second rotor which are arranged in parallel, the rotating shaft is provided with a sleeve and an axial displacement device of the sleeve, the first rotor is fixed on the rotating shaft, the second rotor is arranged on the rotating shaft through the sleeve as a transmission part, and when the sleeve moves under the action of the axial displacement device of the sleeve, the second rotor can do 360 DEG/P limiting rotary displacement relative to the first rotor, wherein P is the number of poles of the motor. The permanent magnet motor for inhibiting the short-circuit fault can achieve the effects of inhibiting the short-circuit fault and being safely applied to rail transit and aviation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a permanent magnet motor for suppressing a short-circuit fault according to the present invention;
fig. 2 is a schematic structural diagram of an arrangement of a permanent magnet motor multiphase alternating current winding and rotor embedded magnetic steel for suppressing a short-circuit fault according to the present invention;
fig. 3 is a schematic structural diagram of a permanent magnet motor rotor for suppressing a short-circuit fault according to the present invention;
fig. 4 is a schematic structural diagram illustrating alignment of homopolar magnetic fields of a second rotor and a first rotor of a permanent magnet motor for suppressing a short-circuit fault according to the present invention;
fig. 5 is a schematic structural diagram illustrating alignment of a second rotor and a first rotor of a permanent magnet motor for suppressing a short-circuit fault according to the present invention;
FIG. 6 is a schematic structural diagram of an integral key of a sleeve of a permanent magnet motor for suppressing a short-circuit fault according to the present invention;
fig. 7 is a schematic structural diagram of a permanent magnet motor sleeve separation key for suppressing a short-circuit fault according to the present invention;
FIG. 8 is a schematic view of a permanent magnet motor sleeve for suppressing short circuit faults axially removed from a second rotor according to the present invention;
fig. 9 is a schematic diagram of a groove and bump limiting structure of a permanent magnet motor for suppressing a short-circuit fault, in which a second rotor and a first rotor of the permanent magnet motor are aligned in a homopolar magnetic field according to the present invention;
fig. 10 is a schematic structural diagram of the position limitation of the grooves and the bumps aligned with the heteropolar magnetic fields of the second rotor and the first rotor of the permanent magnet motor for suppressing the short-circuit fault according to the present invention;
fig. 11 is a schematic structural diagram of a first rotor groove of a permanent magnet motor for suppressing a short-circuit fault according to the present invention, in which a spring and a damper are disposed;
description of reference numerals:
1-a rotating shaft; 2-a bearing; 3-end cover; 4-a polyphase alternating current winding; 5-a magnetically permeable iron core; 6-a first rotor; 7-a second rotor; 8-a sleeve; 9-an electromagnet; 10-a thrust bearing; 11-a second spring; 12-magnetic steel; 13-a boss; 14-a groove; 15-separation of the external bond; 16-a separate internal bond; 17-a first spring; 18-a damper.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the utility model provides an restrain short-circuit fault's permanent-magnet machine, restrain short-circuit fault's permanent-magnet machine include frame, end cover 3, run through end cover 3's pivot 1, set up stator and the rotor of setting in pivot 1 in the frame, the rotor including the first rotor 6 and the second rotor 7 that set up side by side, pivot 1 on be provided with sleeve 8 and telescopic axial displacement device, first rotor 6 fix on pivot 1, second rotor 7 set up on pivot 1 as the driving medium through sleeve 8, when sleeve 8 shifts out the second rotor under telescopic axial displacement device effect, second rotor 7 can do 360 degrees/P's spacing rotary displacement relatively first rotor 6, wherein P is the number of poles of motor.
In this embodiment, the sleeve 8 is a key sleeve integrated structure for connecting the rotating shaft 1 and the second rotor 7. The sleeve 8 adopts a spline structure, as shown in fig. 3.
In this embodiment, first rotor 6 and second rotor 7 between be provided with spacing protruding piece and the spacing groove of mutually supporting, spacing protruding piece embedding spacing groove can take place the displacement relatively, the maximum value of displacement is for making to form 360 °/P's rotational displacement between second rotor 6 and the first rotor 7, spacing protruding piece and spacing groove set up respectively on first rotor 6 and second rotor 7 or spacing protruding piece and spacing groove set up respectively on second rotor 7 and first rotor 6. The relative rotation displacement between the second rotor 7 and the first rotor 6 is limited by the mutual matching of the limiting convex part and the limiting groove.
In this embodiment, the limiting convex part is an arc-shaped boss 13, the limiting groove is an arc-shaped groove 14, and the circumferential angle of the groove 14 is the sum of the circumferential angle of the boss 13 and an angle of 360 °/P. The limit convex part can also adopt a circular boss, and the limit groove can also adopt an elliptical channel.
In this embodiment, the first spring 17 and the damper 18 are disposed in the limiting groove. The first spring is used for assisting the second rotor to rotate and displace relative to the first rotor, and the damper plays a role in damping during the rotation and displacement of the second rotor relative to the first rotor.
In this embodiment, the axial displacement means of the sleeve comprises a second spring 11, one end of which is arranged on the end cap 3, an electromagnet and a thrust bearing 10 arranged at the other end of the second spring 11. When the electromagnet is in an electrified state, the sleeve generates axial displacement, so that the second rotor is separated from transmission connection with the rotating shaft; and under the power-off state of the electromagnet, the sleeve is axially moved into the second rotor under the action of the second spring, and the sleeve restores the transmission connection between the second rotor and the rotating shaft.
In this embodiment, the stator includes polyphase ac winding 4 and magnetic core 5, the magnetic field structure of first rotor is the same with the magnetic field structure of second rotor, the magnet steel of rotor arranges and adopts embedded magnet steel to arrange.
The stator is similar to the stator structure of a conventional alternating current motor and comprises a multiphase (most commonly three-phase) alternating current winding 4 (comprising a distributed winding or a centralized winding) and a magnetic conduction iron core 5. The multi-phase alternating current winding 4 can provide power excitation and control according to the running mode of an alternating current permanent magnet synchronous motor, and can also provide power excitation and control according to the running mode of a brushless direct current motor.
In this embodiment, the electromagnet is a solenoid electromagnet 9.
In this embodiment, the grooves are provided on the first rotor and the lands are provided on the second rotor.
The first rotor groove 14 is 360/P wider than the circumferential angle of the lands 13 of the second rotor so that the displacement of the second rotor relative to the first rotor is limited to both homopolar magnetic field alignment (as shown in fig. 9) and heteropolar magnetic field alignment (as shown in fig. 10). When the sleeve 8 is axially moved out of the second rotor under the action of the electromagnet, the second rotor generates 360 DEG/P limit rotation displacement under the action of electromagnetic force and inertia force.
During normal operation of the motor, the magnetic fields of the second rotor and the first rotor are aligned with the same polarity, as shown in fig. 4. When the motor has short-circuit fault, the second rotor deflects 360 degrees/P relative to the first rotor to align with the opposite polarity of the magnetic field of the first rotor through the axial displacement device of the sleeve and the cooperation of the groove on the second rotor 7 and the boss on the first rotor, and as shown in figure 5, the induced electromotive force of the multi-phase alternating-current winding is zero, so that the short-circuit fault is suppressed.
The advantages of this embodiment:
the invention provides a permanent magnet motor for inhibiting short-circuit faults, which comprises a base, an end cover, a rotating shaft penetrating through the end cover, a stator arranged on the base and a rotor arranged on the rotating shaft, wherein the rotor comprises a first rotor, a second rotor, a sleeve axial displacement device and a rotary displacement limiting device, the first rotor is fixed on the rotating shaft, the second rotor is arranged on the rotating shaft through the sleeve axial displacement device, the axial displacement mechanism is arranged on the rotating shaft, and the second rotor performs 360 DEG/P rotary displacement relative to the first rotor through the rotary displacement limiting device, wherein P is the number of poles of the motor. The permanent magnet motor for inhibiting the short-circuit fault can achieve the effects of inhibiting the short-circuit fault and being safely applied to rail transit and aviation; the sleeve is controlled to move along the rotating shaft through an axial displacement device of the sleeve; when the electromagnet is in an electrified state, the sleeve generates axial displacement, so that the second rotor is separated from the transmission connection with the rotating shaft; when the electromagnet is in a power-off state, the sleeve is axially moved into the second rotor under the action of the second spring, and the sleeve restores the transmission connection between the second rotor and the rotating shaft; the first spring is used for assisting the second rotor to rotate and displace relative to the first rotor, and the damper plays a role in damping during the rotation and displacement of the second rotor relative to the first rotor.
Example two:
the utility model provides an restrain short-circuit fault's permanent-magnet machine, restrain short-circuit fault's permanent-magnet machine include frame, end cover 3, run through end cover 3's pivot 1, set up stator and the rotor of setting in pivot 1 in the frame, the rotor including the first rotor 6 and the second rotor 7 that set up side by side, pivot 1 on be provided with sleeve 8 and telescopic axial displacement device, first rotor 6 fix on pivot 1, second rotor 7 set up on pivot 1 as the driving medium through sleeve 8, when sleeve 8 shifts out the second rotor under telescopic axial displacement device effect, second rotor 7 can do 360 degrees/P's spacing rotary displacement relatively first rotor 6, wherein P is the number of poles of motor.
In this embodiment, the sleeve 8 is a key sleeve integrated structure for connecting the rotating shaft 1 and the second rotor 7. The sleeve 8 adopts a multi-key structure, as shown in fig. 6.
In this embodiment, first rotor 6 and second rotor 7 between be provided with spacing protruding piece and the spacing groove of mutually supporting, spacing protruding piece embedding spacing groove can take place the displacement relatively, the maximum value of displacement is for making to form 360 °/P's rotational displacement between second rotor 6 and the first rotor 7, spacing protruding piece and spacing groove set up respectively on first rotor 6 and second rotor 7 or spacing protruding piece and spacing groove set up respectively on second rotor 7 and first rotor 6. The relative rotation displacement between the second rotor 7 and the first rotor 6 is limited by the mutual matching of the limiting convex part and the limiting groove.
In this embodiment, the limiting convex part is an arc-shaped boss 13, the limiting groove is an arc-shaped groove 14, and the circumferential angle of the groove 14 is the sum of the circumferential angle of the boss 13 and an angle of 360 °/P. The limit convex part can also adopt a circular boss, and the limit groove can also adopt an elliptical channel.
In this embodiment, the first spring 17 and the damper 18 are disposed in the limiting groove.
In this embodiment, the axial displacement means of the sleeve comprises a second spring 11, one end of which is arranged on the end cap 3, an electromagnet and a thrust bearing 10 arranged at the other end of the second spring 11. When the electromagnet is in an electrified state, the sleeve generates axial displacement, so that the second rotor is separated from transmission connection with the rotating shaft; and under the power-off state of the electromagnet, the sleeve is axially moved into the second rotor under the action of the second spring, and the sleeve restores the transmission connection between the second rotor and the rotating shaft.
In this embodiment, the stator includes polyphase ac winding 4 and magnetic core 5, the magnetic field structure of first rotor is the same with the magnetic field structure of second rotor, the magnet steel of rotor arranges and adopts embedded magnet steel to arrange.
The stator is similar to the stator structure of a conventional alternating current motor and comprises a multiphase (most commonly three-phase) alternating current winding 4 (comprising a distributed winding or a centralized winding) and a magnetic conduction iron core 5. The multi-phase alternating current winding 4 can provide power excitation and control according to the running mode of an alternating current permanent magnet synchronous motor, and can also provide power excitation and control according to the running mode of a brushless direct current motor.
In this embodiment, the electromagnet is a solenoid electromagnet 9.
In this embodiment, the grooves are provided on the first rotor and the lands are provided on the second rotor.
The first rotor groove 14 is 360/P wider than the circumferential angle of the lands 13 of the second rotor so that the displacement of the second rotor relative to the first rotor is limited to both homopolar magnetic field alignment (as shown in fig. 9) and heteropolar magnetic field alignment (as shown in fig. 10). When the sleeve 8 is axially moved out of the second rotor under the action of the electromagnet, the second rotor generates 360 DEG/P limit rotation displacement under the action of electromagnetic force and inertia force.
During normal operation of the motor, the magnetic fields of the second rotor and the first rotor are aligned with the same polarity, as shown in fig. 4. When the motor has short-circuit fault, the second rotor deflects 360 degrees/P relative to the first rotor to align with the opposite polarity of the magnetic field of the first rotor through the axial displacement device of the sleeve and the cooperation of the groove on the second rotor 7 and the boss on the first rotor, and as shown in figure 5, the induced electromotive force of the multi-phase alternating current winding is zero, so that the short-circuit fault is suppressed.
The advantages of this embodiment:
the invention relates to a permanent magnet motor for inhibiting short-circuit faults, which comprises a base, an end cover, a rotating shaft penetrating through the end cover, a stator arranged on the base and a rotor arranged on the rotating shaft, wherein the rotor comprises a first rotor, a second rotor, a sleeve axial displacement device and a rotary displacement limiting device, the first rotor is fixed on the rotating shaft, the second rotor is arranged on the rotating shaft through the sleeve axial displacement device, the axial displacement mechanism is arranged on the rotating shaft, the second rotor performs 360 DEG/P rotary displacement relative to the first rotor through the rotary displacement limiting device, P is the number of poles of the motor, and the stator is an armature. The permanent magnet motor for inhibiting the short-circuit fault can achieve the effects of inhibiting the short-circuit fault and being safely applied to rail transit and aviation; the sleeve is controlled to move along the rotating shaft through an axial displacement device of the sleeve; when the electromagnet is in an electrified state, the sleeve generates axial displacement, so that the second rotor is separated from transmission connection with the rotating shaft; and under the power-off state of the electromagnet, the sleeve is axially moved into the second rotor under the action of the second spring, and the sleeve restores the transmission connection between the second rotor and the rotating shaft. The first spring is used for assisting the second rotor to rotate and displace relative to the first rotor, and the damper plays a role in damping during the displacement of the second rotor relative to the first rotor.
Example three:
the utility model provides an restrain short-circuit fault's permanent-magnet machine, restrain short-circuit fault's permanent-magnet machine include frame, end cover 3, run through end cover 3's pivot 1, set up stator and the rotor of setting in pivot 1 in the frame, the rotor including the first rotor 6 and the second rotor 7 that set up side by side, pivot 1 on be provided with sleeve 8 and telescopic axial displacement device, first rotor 6 fix on pivot 1, second rotor 7 set up on pivot 1 as the driving medium through sleeve 8, when sleeve 8 removed under telescopic axial displacement device effect, second rotor 7 can do 360/P's spacing rotary displacement for first rotor 6 relatively, wherein P is the number of poles of motor.
In the present embodiment, the sleeve 8 connects the rotating shaft 1 and the second rotor 7 by using a key sleeve separation structure. The sleeve 8 adopts a multi-key structure, as shown in fig. 7.
In this embodiment, first rotor 6 and second rotor 7 between be provided with spacing protruding piece and the spacing groove of mutually supporting, spacing protruding piece embedding spacing groove can take place the displacement relatively, the maximum value of displacement is for making to form 360 °/P's rotational displacement between second rotor 6 and the first rotor 7, spacing protruding piece and spacing groove set up respectively on first rotor 6 and second rotor 7 or spacing protruding piece and spacing groove set up respectively on second rotor 7 and first rotor 6. The relative rotation displacement between the second rotor 7 and the first rotor 6 is limited by the mutual matching of the limiting convex part and the limiting groove
In this embodiment, the limiting convex part is an arc-shaped boss 13, the limiting groove is an arc-shaped groove 14, and the circumferential angle of the groove 14 is the sum of the circumferential angle of the boss 13 and an angle of 360 °/P. The limit convex part can also adopt a circular boss, and the limit groove can also adopt an elliptical channel.
In this embodiment, the first spring 17 and the damper 18 are disposed in the limiting groove. The first spring is used for assisting the displacement of the second rotor, and the damper plays a role in damping in the displacement process of the second rotor.
In this embodiment, the axial displacement means of the sleeve comprises a second spring 11, one end of which is arranged on the end cap 3, an electromagnet and a thrust bearing 10 arranged at the other end of the second spring 11. When the electromagnet is in an electrified state, the sleeve generates axial displacement, so that the second rotor is separated from transmission connection with the rotating shaft; and under the power-off state of the electromagnet, the sleeve is axially moved into the second rotor under the action of the second spring, and the sleeve restores the transmission connection between the second rotor and the rotating shaft.
In this embodiment, the stator includes polyphase ac winding 4 and magnetic core 5, the magnetic field structure of first rotor is the same with the magnetic field structure of second rotor, the magnet steel of rotor arranges and adopts embedded magnet steel to arrange.
The stator is similar to the stator structure of a conventional alternating current motor and comprises a multiphase (most commonly three-phase) alternating current winding 4 (comprising a distributed winding or a centralized winding) and a magnetic conduction iron core 5. The multi-phase alternating current winding 4 can provide power excitation and control according to the running mode of an alternating current permanent magnet synchronous motor, and can also provide power excitation and control according to the running mode of a brushless direct current motor.
In this embodiment, the electromagnet is a solenoid electromagnet 9.
In this embodiment, the grooves are provided on the first rotor and the lands are provided on the second rotor.
The first rotor groove 14 is 360/P wider than the circumferential angle of the lands 13 of the second rotor so that the displacement of the second rotor relative to the first rotor is limited to both homopolar magnetic field alignment (as shown in fig. 9) and heteropolar magnetic field alignment (as shown in fig. 10). When the sleeve 8 is axially moved out of the second rotor under the action of the electromagnet, the second rotor generates 360 DEG/P limit rotation displacement under the action of electromagnetic force and inertia force.
During normal operation of the motor, the magnetic fields of the second rotor and the first rotor are aligned with the same polarity, as shown in fig. 4. When the motor has short-circuit fault, the second rotor deflects 360 degrees/P relative to the first rotor to align with the opposite polarity of the magnetic field of the first rotor through the axial displacement device of the sleeve and the cooperation of the groove on the second rotor 7 and the boss on the first rotor, and as shown in figure 5, the induced electromotive force of the multi-phase alternating current winding is zero, so that the short-circuit fault is suppressed.
The advantages of this embodiment:
the invention relates to a permanent magnet motor for inhibiting short-circuit faults, which comprises a base, an end cover, a rotating shaft penetrating through the end cover, a stator arranged on the base and a rotor arranged on the rotating shaft, wherein the rotor comprises a first rotor, a second rotor, a sleeve axial displacement device and a rotary displacement limiting device, the first rotor is fixed on the rotating shaft, the second rotor is arranged on the rotating shaft through the sleeve axial displacement device, the axial displacement mechanism is arranged on the rotating shaft, the second rotor performs 360 DEG/P rotary displacement relative to the first rotor through the rotary displacement limiting device, P is the number of poles of the motor, and the stator is an armature. The permanent magnet motor for inhibiting the short-circuit fault can achieve the effects of inhibiting the short-circuit fault and being safely applied to rail transit and aviation; the sleeve is controlled to move along the rotating shaft through an axial displacement device of the sleeve; under the power-off state of the electromagnet, the sleeve is axially moved into the second rotor under the action of the second spring, the sleeve restores the transmission connection between the second rotor and the rotating shaft, and the electromagnet is in the power-on state, and the sleeve generates axial displacement, so that the second rotor is separated from the transmission connection of the rotating shaft. The first spring is used for assisting the second rotor to rotate and displace relative to the first rotor, and the damper plays a role in damping during the rotation and displacement of the second rotor relative to the first rotor.
Example four:
the utility model provides an restrain short-circuit fault's permanent-magnet machine, restrain short-circuit fault's permanent-magnet machine include frame, end cover 3, run through end cover 3's pivot 1, set up stator and the rotor of setting in pivot 1 in the frame, the rotor including the first rotor 6 and the second rotor 7 that set up side by side, pivot 1 on be provided with sleeve 8 and telescopic axial displacement device, first rotor 6 fix on pivot 1, second rotor 7 set up on pivot 1 as the driving medium through sleeve 8, when sleeve 8 shifts out the second rotor under telescopic axial displacement device effect, second rotor 7 can do 360 degrees/P's spacing rotary displacement relatively first rotor 6, wherein P is the number of poles of motor.
In this embodiment, the sleeve 8 is a key sleeve integrated structure for connecting the rotating shaft 1 and the second rotor 7. The sleeve 8 adopts a spline structure, as shown in fig. 3.
In this embodiment, first rotor 6 and second rotor 7 between be provided with spacing protruding piece and the spacing groove of mutually supporting, spacing protruding piece embedding spacing groove can take place the displacement relatively, the maximum value of displacement is for making to form 360 °/P's rotational displacement between second rotor 6 and the first rotor 7, spacing protruding piece and spacing groove set up respectively on first rotor 6 and second rotor 7 or spacing protruding piece and spacing groove set up respectively on second rotor 7 and first rotor 6. The relative rotation displacement between the second rotor 7 and the first rotor 6 is limited by the mutual matching of the limiting convex part and the limiting groove.
In this embodiment, the limiting convex part is an arc-shaped boss 13, the limiting groove is an arc-shaped groove 14, and the circumferential angle of the groove 14 is the sum of the circumferential angle of the boss 13 and an angle of 360 °/P. The limit convex part can also adopt a circular boss, and the limit groove can also adopt an elliptical channel.
In this embodiment, the first spring 17 and the damper 18 are disposed in the limiting groove. The first spring is used for assisting the second rotor to rotate and displace relative to the first rotor, and the damper plays a role in damping during the rotation and displacement of the second rotor relative to the second rotor.
In this embodiment, the axial displacement means of the sleeve comprises a second spring 11, one end of which is arranged on the end cap 3, an electromagnet and a thrust bearing 10 arranged at the other end of the second spring 11. When the electromagnet is in an electrified state, the sleeve generates axial displacement, so that the second rotor is separated from transmission connection with the rotating shaft; and under the power-off state of the electromagnet, the sleeve is axially moved into the second rotor under the action of the second spring, and the sleeve restores the transmission connection between the second rotor and the rotating shaft.
In this embodiment, the stator includes polyphase ac winding 4 and magnetic core 5, the magnetic field structure of first rotor is the same with the magnetic field structure of second rotor, the magnet steel of rotor arranges and adopts embedded magnet steel to arrange.
The stator is similar to the stator structure of a conventional alternating current motor and comprises a multiphase (most commonly three-phase) alternating current winding 4 (comprising a distributed winding or a centralized winding) and a magnetic conduction iron core 5. The multi-phase alternating current winding 4 can provide power excitation and control according to the running mode of an alternating current permanent magnet synchronous motor, and can also provide power excitation and control according to the running mode of a brushless direct current motor.
In this embodiment, the electromagnet is a solenoid electromagnet 9.
In this embodiment, the grooves are provided on the second rotor and the lands are provided on the first rotor.
The second rotor recess 14 is 360/P wider than the circumferential angle of the lands 13 of the first rotor so that the displacement of the second rotor relative to the first rotor is limited to both homopolar magnetic field alignment (as shown in fig. 9) and heteropolar magnetic field alignment (as shown in fig. 10). When the sleeve 8 is moved axially out of the second rotor under the action of the electromagnet, the second rotor generates a 360 °/P limit rotational displacement relative to the first rotor under the action of electromagnetic force and inertial force.
During normal operation of the motor, the magnetic fields of the second rotor and the first rotor are aligned with the same polarity, as shown in fig. 4. When the motor has short-circuit fault, the second rotor deflects 360 degrees/P relative to the first rotor to align with the opposite polarity of the magnetic field of the first rotor through the axial displacement device of the sleeve and the cooperation of the groove on the second rotor 7 and the boss on the first rotor, and as shown in figure 5, the induced electromotive force of the multi-phase alternating current winding is zero, so that the short-circuit fault is suppressed.
The advantages of this embodiment:
the invention relates to a permanent magnet motor for inhibiting short-circuit faults, which comprises a base, an end cover, a rotating shaft penetrating through the end cover, a stator arranged on the base and a rotor arranged on the rotating shaft, wherein the rotor comprises a first rotor, a second rotor, a sleeve axial displacement device and a rotary displacement limiting device, the first rotor is fixed on the rotating shaft, the second rotor is arranged on the rotating shaft through the sleeve axial displacement device, the axial displacement mechanism is arranged on the rotating shaft, the second rotor performs 360 DEG/P rotary displacement relative to the first rotor through the rotary displacement limiting device, P is the number of poles of the motor, and the stator is an armature. The permanent magnet motor for inhibiting the short-circuit fault can achieve the effects of inhibiting the short-circuit fault and being safely applied to rail transit and aviation; the sleeve is controlled to move along the rotating shaft through an axial displacement device of the sleeve; when the electromagnet is in an electrified state, the sleeve generates axial displacement, so that the second rotor is separated from transmission connection with the rotating shaft; and under the power-off state of the electromagnet, the sleeve is axially moved into the second rotor under the action of the second spring, and the sleeve restores the transmission connection between the second rotor and the rotating shaft. The first spring is used for assisting the second rotor to rotate and displace relative to the first rotor, and the damper plays a role in damping during the rotation and displacement of the second rotor relative to the first rotor.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed herein are intended to be covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. The utility model provides an restrain short-circuit fault's permanent-magnet machine, restrain short-circuit fault's permanent-magnet machine include frame, end cover, the pivot that runs through the end cover, set up the stator on the frame and set up at the epaxial rotor of commentaries on classics, its characterized in that:
the rotor comprises a first rotor and a second rotor which are arranged in parallel, a sleeve and an axial displacement device of the sleeve are arranged on the rotating shaft, the first rotor is fixed on the rotating shaft, the second rotor is arranged on the rotating shaft by taking the sleeve as a transmission part, and when the sleeve is moved out of the second rotor under the action of the axial displacement device of the sleeve, the second rotor can do 360 DEG/P limiting rotary displacement relative to the first rotor, wherein P is the number of poles of the motor;
a limiting convex part and a limiting groove which are matched with each other are arranged between the first rotor and the second rotor, the limiting convex part is embedded into the limiting groove and can be displaced relative to the limiting groove, the maximum value of the displacement is that 360 DEG/P rotary displacement is formed between the second rotor and the first rotor, the limiting convex part and the limiting groove are respectively arranged on the first rotor and the second rotor or the limiting convex part and the limiting groove are respectively arranged on the second rotor and the first rotor;
the axial displacement device of the sleeve comprises a second spring, an electromagnet and a thrust bearing, wherein one end of the second spring is arranged on the end cover, and the thrust bearing is arranged at the other end of the second spring.
2. The permanent magnet motor for suppressing short-circuit faults according to claim 1, wherein the limiting convex part is an arc-shaped boss, the limiting groove is an arc-shaped groove, and the circumferential angle of the groove is the sum of the circumferential angle of the boss and an angle of 360 °/P.
3. A short-circuit fault-suppressed permanent magnet electric machine according to claim 2, characterized in that: and a first spring and a damper are arranged in the limiting groove.
4. A short-circuit fault-suppressed permanent magnet electric machine according to claim 1, characterized in that: the sleeve is connected with the second rotor and the rotating shaft through keys.
5. A short-circuit fault-suppressed permanent magnet electric machine according to claim 1, characterized in that: the sleeve is connected with the rotating shaft and the second rotor by adopting a key sleeve integral structure or a key sleeve separation structure.
6. A short-circuit fault-suppressed permanent magnet electric machine according to claim 1, characterized in that: the sleeve adopts an integral spline structure or a multi-key structure.
7. A short-circuit fault-suppressed permanent magnet electric machine according to claim 1, characterized in that: the electromagnet is a solenoid electromagnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911160702.5A CN110868033B (en) | 2019-11-23 | 2019-11-23 | Permanent magnet motor for inhibiting short circuit fault |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911160702.5A CN110868033B (en) | 2019-11-23 | 2019-11-23 | Permanent magnet motor for inhibiting short circuit fault |
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| Publication Number | Publication Date |
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| CN110868033A CN110868033A (en) | 2020-03-06 |
| CN110868033B true CN110868033B (en) | 2021-08-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5821710A (en) * | 1996-09-30 | 1998-10-13 | Hitachi Metals, Ltd. | Brushless motor having permanent magnets |
| CN1382560A (en) * | 2001-02-28 | 2002-12-04 | 株式会社日立制作所 | Machine tool |
| JP2011030341A (en) * | 2009-07-24 | 2011-02-10 | Hitachi Ltd | Rotating electrical machine |
| CN107134904A (en) * | 2016-02-26 | 2017-09-05 | 大众汽车有限公司 | Method for running motor |
| CN206878583U (en) * | 2017-07-19 | 2018-01-12 | 江苏金彭车业有限公司 | Speed capable of automatic changing and the rotor of torque |
-
2019
- 2019-11-23 CN CN201911160702.5A patent/CN110868033B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5821710A (en) * | 1996-09-30 | 1998-10-13 | Hitachi Metals, Ltd. | Brushless motor having permanent magnets |
| CN1382560A (en) * | 2001-02-28 | 2002-12-04 | 株式会社日立制作所 | Machine tool |
| JP2011030341A (en) * | 2009-07-24 | 2011-02-10 | Hitachi Ltd | Rotating electrical machine |
| CN107134904A (en) * | 2016-02-26 | 2017-09-05 | 大众汽车有限公司 | Method for running motor |
| CN206878583U (en) * | 2017-07-19 | 2018-01-12 | 江苏金彭车业有限公司 | Speed capable of automatic changing and the rotor of torque |
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| CN110868033A (en) | 2020-03-06 |
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