CN110224555B

CN110224555B - Low-magnetic-resistance magnetoelectric device

Info

Publication number: CN110224555B
Application number: CN201910299824.6A
Authority: CN
Inventors: 李鹤群
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-04-15
Filing date: 2019-04-15
Publication date: 2020-11-13
Anticipated expiration: 2039-04-15
Also published as: CN110224555A

Abstract

The invention relates to the technical field of magnetoelectric coupling sensors, in particular to a magnetoelectric device with low magnetic resistance, which is used for detecting a moving part and comprises the following components: a magnet for providing a magnetic field, the magnetic field extending along a movement path of the moving member to be detected and diverging laterally of the movement path; the first side magnetic conduction arms are arranged along the extension direction of the magnetic field, are connected with two magnetic poles of the magnetic field at the first side of the extension direction of the magnetic field and are used for forming a first side magnetic path; the second side magnetic conduction arm is connected with the moving part and moves along with the moving part relative to the first side magnetic conduction arm, and the second side magnetic conduction arm and the first side magnetic conduction arm are periodically coupled to form a magnetic path in the moving process so that the magnetic flux of the first side magnetic conduction arm generates periodic change; and the induction coils are sleeved on the first side magnetic conduction arms, induce the magnetic flux change in the first side magnetic conduction arms and output electromotive force signals. The substantial effects of the invention are as follows: the detection sensitivity of displacement and speed is improved; reducing the magnetic resistance and the influence on the state of the detected moving part.

Description

Low-magnetic-resistance magnetoelectric device

Technical Field

The invention relates to the technical field of magnetoelectric coupling sensors, in particular to a magnetoelectric device with low magnetic resistance.

Background

At present, displacement sensors and rotation speed sensors are widely applied to various devices. For example, displacement sensors are used in hydraulic systems to measure the extension length of a hydraulic rod. The rotating speed sensor is used for measuring the rotating speed of the stirring rod in the sealed shell. With the development of manufacturing industry and the improvement of equipment precision and service life, higher requirements are put on a displacement sensor and a rotating speed sensor. Compared with a contact type measuring sensor, a non-contact type sensor using magnetoelectric conversion has advantages of long life, small abrasion and simple maintenance, and thus is used in large quantities. Such as an electromagnetic pulse type sensor for measuring the rotational displacement and speed of the crankshaft of an internal combustion engine. However, the conventional electromagnetic pulse sensor has a large magnetic resistance when the coil cuts the magnetic induction line, and consumes a large amount of power, which results in energy waste. It is therefore necessary to investigate how to reduce the reluctance of a magnetoelectric pulse sensor.

The applicant has searched for the closest prior art to the present application to be the utility model patent with application number CN96220766.7, published as 9/23/1998, entitled coupled magnetoelectric sensor, which uses the electromagnetic principle to test the components of the sealed shaft rotation speed. The generator is arranged on a sealed shaft, the receiver is arranged outside a sealing sleeve, the generator is made of pure iron (small in magnetic resistance), the shape of the upper end and the lower end of the generator is similar to that of a gear, the upper end and the lower end of the generator are twelve teeth, the sealing sleeve 2 is made of magnetic isolation material 1Cr18Ni9Ti stainless steel, the receiver is made of a probe, a connecting block, an iron core, a coil and a shell, the probe is made of a magnet, the iron core is made of pure iron, the probe and the connecting block are arranged on the connecting block and jointly form a horseshoe-shaped magnet, and the probe is aligned with the upper end teeth and the lower end teeth of the generator. The generator and receiver are coupled 12 times during a revolution of the shaft, which converts the measured rotational speed to a coupled frequency indicative of the rotational speed of the seal shaft.

The disadvantages of the scheme are as follows: the outward divergent part of the magnetic field of the horseshoe-shaped magnet is not utilized, so that the magnetic field resource is wasted; in order to form clear pulses, large gaps need to be reserved between teeth of a generator of the pulse generator, the generator cannot be densely arranged, the nonuniformity of magnetic field distribution is increased, the reluctance force is increased, the minimum angular displacement capable of being detected by the generator is also increased, and the sensitivity is reduced.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the current magneto-electric device has the technical problems of large magnetic resistance or low sensitivity. A magnetoelectric device of low magnetic resistance is provided, which has more uniform magnetic field distribution, smaller magnetic resistance, higher sensitivity.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a low reluctance magnetoelectric device for detecting a moving member, comprising: a magnet for providing a magnetic field extending along a movement path of the moving member to be detected and diverging laterally of the movement path; the first side magnetic conduction arms are closely arranged along the extension direction of the magnetic field, are connected with two magnetic poles of the magnetic field from the first side of the extension direction of the magnetic field and are used for forming a first side magnetic path; the second side magnetic conduction arm is connected with the moving part and moves along with the moving part relative to the first side magnetic conduction arm, and the second side magnetic conduction arm and the first side magnetic conduction arm are periodically coupled to form a magnetic path in the moving process so that the magnetic flux of the first side magnetic conduction arm generates periodic change; and the induction coils are sleeved on the first side magnetic conduction arms, induce the magnetic flux change in the first side magnetic conduction arms and output electromotive force signals.

This technical scheme has a plurality of first side magnetic arms and induction coil, makes the less displacement of detection motion piece removal just can trigger an induction coil at least and produce induced electromotive force, has improved the sensitivity of detection.

Preferably, the second side magnetic arm has magnetism. In the preferred technical scheme, if the magnetic pole direction of the second side magnetic conduction arm is the same as the magnetic pole direction of the magnet, when the second side magnetic conduction arm is coupled with the first side magnetic conduction arm, the magnetic induction lines of the second side magnetic conduction arm and the magnetic induction lines scattered on one side of the magnet, which is positioned on the second side magnetic conduction arm, are forced to be led into the first side magnetic conduction arm, and when the second side magnetic conduction arm is decoupled, the additional magnetic induction lines are drawn out; if the magnetic pole direction of the second side magnetic conduction arm is opposite to the magnetic pole direction of the magnet, when the second side magnetic conduction arm is coupled with the first side magnetic conduction arm, more magnetic induction lines can be extracted out of the first side magnetic conduction arm, and when the second side magnetic conduction arm is decoupled, the additionally extracted magnetic induction lines can reenter the first side magnetic conduction arm; therefore, in the process of periodically coupling the second side magnetic conduction arm and the first side magnetic conduction arm, the magnetic flux of the first side magnetic conduction arm changes greatly, stronger induced electromotive force is generated, and the sensitivity to the detection speed is improved.

Preferably, the magnetic pole type permanent magnet synchronous motor further comprises two end magnetizers used for collecting magnetic fields at two magnetic poles of the magnet, and the first side magnetic conduction arm and the second side magnetic conduction arm are coupled with the two magnetic poles of the magnetic field through the two end magnetizers. In the preferred technical scheme, the magnetic fields at the two magnetic poles of the magnet are folded, so that the magnetic field resources are fully utilized, the sensitivity of the motion speed detection is improved, and meanwhile, the end magnetizer is used as a good conductor of magnetism, so that the magnetic induction lines of the magnet tend to be uniform in the end magnetizer more quickly, and the magnetic resistance is reduced.

Preferably, the span of the second side magnetic arm along the motion path is greater than the span of the first side magnetic arm along the motion path; the magnetoelectric device comprises two magnets and a plurality of second side magnetic conduction arms, the second side magnetic conduction arms of the plurality of are divided into two groups aligned with the two magnets respectively, the magnetic poles of the second side magnetic conduction arms adjacent to each other in the same group are opposite in direction, and the magnetic poles of the second side magnetic conduction arms aligned in the direction of the connecting line of the two magnets are opposite in direction. In the preferred technical scheme, the first side magnetic conduction arms which are mutually abutted and closely arranged enable the magnetic field of the magnet to be more densely changed in strength, and the strength difference of the magnetic field in strength alternation is reduced by the denser change, so that the magnetic resistance is reduced. Through setting up two magnets and two sets of second side magnetic conduction arms, can improve the magnetic flux change of first side magnetic conduction arm, improve detectivity, reduce the requirement to single magnet magnetic field intensity.

Preferably, the span of the second side magnetic arm along the motion path is greater than the span of the first side magnetic arm along the motion path. In the preferred technical scheme, the second side magnetic conduction arm is widened, so that the time interval exists between the positive pulse and the negative pulse generated by the induction coil, the time interval of two pulse resistances is shortened, more time is given to the moving part to be detected to recover the influence caused by the pulse resistance, and the influence of the magnetic resistance on the moving state of the moving part to be detected is reduced.

Preferably, the detected moving part is a rotary moving part; the magnet is a magnetic ring, and the magnetic pole of the magnetic ring is along the axial direction of the magnetic ring; the first side magnetic conduction arms are distributed along the inner circular surface or the outer circular surface of the magnetic ring, two ends of each first side magnetic conduction arm are respectively coupled with two magnetic poles of the magnetic ring, each second side magnetic conduction arm is a sector ring body with the thickness along the axial direction of the magnetic ring, each second side magnetic conduction arm is positioned on one side of the magnetic ring opposite to the corresponding first side magnetic conduction arm, each second side magnetic conduction arm is connected with the rotary motion part through a connecting piece and rotates along with the rotary motion part, and a rotating shaft of each second side magnetic conduction arm and a central shaft of the sector ring body are coaxial with the magnetic ring; two ends of the first side magnetic conduction arm cover or partially cover two end faces of the magnetic ring, two end faces of the first side magnetic conduction arm are arc faces coaxial with the magnetic ring, and the second side magnetic conduction arm is provided with a coupling part which forms a uniform gap with two end faces of the first side magnetic conduction arm.

In the preferred technical scheme, when the second side magnetic conduction arm rotates along with the rotary motion piece, the second side magnetic conduction arm can be periodically coupled with the first side magnetic conduction arm to share the magnetic flux in the first side magnetic conduction arm, so that the magnetic flux of the first side magnetic conduction arm periodically changes, the change of the magnetic flux can be converted into an electromotive force pulse signal through the induction coil to be output, and the rotary angular displacement of the motion piece can be known by judging which induction coil on the first side magnetic conduction arm generates an electromotive force pulse; when the rotating speed of the moving part is faster, the amplitude of the electromotive force pulse signal is larger, so that speed measurement can be realized.

Preferably, the second side magnetic conduction arm has magnetism, and a magnetic pole of the second side magnetic conduction arm is along the axial direction of the magnetic ring; the magnetoelectric device includes a plurality of second side magnetic conduction arm, a plurality of second side magnetic conduction arm is along the circumference evenly distributed of the rotation center of rotary motion piece, and the both ends face of a plurality of second side magnetic conduction arm is parallel and level respectively, and adjacent second side magnetic conduction arm's magnetic pole opposite direction.

In the preferred technical scheme, when the second side magnetic guide arms which are uniformly distributed rotate, the gravity center can be prevented from deviating from the rotation center, and vibration is avoided; the magnetic pole directions of the adjacent second side magnetic conduction arms are opposite, so that the adjacent pulses generated by the same induction coil are opposite in polarity, the identification is convenient, and the detectable upper limit of the rotating speed can be improved.

Preferably, the magnetoelectric device comprises two magnetic rings and two end magnetizers, the two magnetic rings are concentric and have the same magnetic pole direction, the plurality of first side magnetic conduction arms are respectively provided with an upper arm, a middle arm, a lower arm and a connecting arm, the connecting arm is connected with the upper arm, the middle arm and the first end of the lower arm, the induction coil is sleeved on the middle arm, the first end magnetizer covers the upper end surface of the first magnetic ring, the lower end surface of the first magnetic ring is covered by the upper surface of the middle arm, the upper arm is connected with the first end magnetizer, the second end magnetizer covers the lower end surface of the second magnetic ring, the upper end surface of the second magnetic ring is covered by the lower surface of the middle arm, the lower arm is connected with the second end magnetizer, a notch is formed in the middle of the middle arm in the thickness direction of the magnetic ring, and the inner walls of the two end magnetizers and the second end surface of the middle arm are basically flush with the inner wall of the magnetic ring; the magnetic pole direction of the second side magnetic conduction arms aligned along the axial direction of the magnetic ring is opposite, the thickness of the first group of second side magnetic conduction arms covers the upper surface of the first end magnetizer to the upper edge of the notch of the middle arm, the thickness of the second group of second side magnetic conduction arms covers the lower surface of the second end magnetizer to the lower edge of the notch of the middle arm, and a gap exists between the second side magnetic conduction arms and the inner wall of the magnetic ring.

In the preferred technical scheme, the magnetic fields at the two magnetic poles of the magnet are folded, so that the magnetic field resources are fully utilized, the sensitivity of the motion speed detection is improved, and meanwhile, the end magnetizer is used as a good conductor of magnetism, so that the magnetic induction lines of the magnet tend to be uniform in the end magnetizer more quickly, and the magnetic resistance is reduced. When the magnetic polarity directions of one second side magnetic conducting arm of the first group and the first magnetic ring are the same, the magnetic polarity of the second side magnetic conducting arm of the second group corresponding to the second side magnetic conducting arm of the first group is opposite to that of the second magnetic ring, the magnetic fields of the second side magnetic conducting arm of the first group and the first magnetic ring start from the north magnetic field pole and return to the south magnetic field pole through the upper arm and the middle arm of the first side magnetic conducting arm in the range, the magnetic induction line in the middle arm is almost the sum of the magnetic field intensity of the first magnetic ring and the magnetic field intensity of the second side magnetic conducting arm of the first group, and the magnetic induction line direction is from the first side magnetic conducting arm to the second side magnetic conducting arm; when the moving piece rotates to enable the adjacent second side magnetic conduction arms to rotate, because the magnetic field polarities of the adjacent second side magnetic conduction arms in the two groups are opposite, namely the magnetic field of the second side magnetic conduction arm in the first group is changed to be opposite to the magnetic pole polarity direction of the first magnetic ring, the magnetic field of the second side magnetic conduction arm in the second group is the same as the magnetic pole polarity direction of the second magnetic ring, the second side magnetic conduction arm in the second group starts from the magnetic field north pole together with the magnetic induction line of the second magnetic ring and returns to the magnetic field south pole through the lower arm and the middle arm of the first side magnetic conduction arm within the range, the magnetic induction line in the middle arm is almost the sum of the magnetic field intensity of the second magnetic ring and the magnetic field intensity of the second side magnetic conduction arm in the second group, the magnetic induction line direction is the direction from the second side magnetic conduction arm to the first side magnetic conduction arm, namely the magnetic induction line is just opposite in direction, the magnetic flux in the induction coil is changed to be twice of the, therefore, the electromotive force pulse amplitude generated by the induction coil is obviously improved, and the sensitivity of detecting the speed of the moving part is obviously improved.

Preferably, the detected moving part is a linear moving part; the magnet is a straight magnetic strip extending along a straight line, and the magnetic pole direction of the straight magnetic strip is along the normal direction of the extending direction of the straight magnetic strip; the first side magnetic conduction arms are arranged along one side of the straight magnetic stripe, two ends of the first side magnetic conduction arms are respectively coupled with two magnetic poles of the straight magnetic stripe, the second side magnetic conduction arms are positioned on one side of the straight magnetic stripe opposite to the first side magnetic conduction arms, and the second side magnetic conduction arms are connected with the linear motion part through connecting pieces and move along with the linear motion part; two ends of the first side magnetic conduction arm cover or partially cover two magnetic poles of the straight magnetic stripe, two end faces of the first side magnetic conduction arm are planes parallel to the magnetic pole direction of the straight magnetic stripe and the extending direction of the straight magnetic stripe, and the second side magnetic conduction arm is provided with a coupling part which forms a uniform gap with the end face of the first side magnetic conduction arm.

When the device is applied to detection of displacement and movement speed of a linear movement part with a limited movement range, the displacement and the movement speed of the movement part can be directly obtained through the optimal technical scheme, the precision of displacement detection is determined by the number of the first side magnetic conduction arms, the precision of movement speed detection is determined by the magnetic field intensity of the linear magnetic strips and the number of turns of the induction coil, the magnetic resistance force can be increased by improving the detection precision of the movement speed, the magnetic resistance force can be reduced by improving the precision of displacement detection due to the increase of the number of the first side magnetic conduction arms, the amplitude of an induction pulse signal generated by the induction coil can be reduced, and the difficulty of pulse signal detection is increased.

The substantial effects of the invention are as follows: through the plurality of first side magnetic guide arms and the induction coils, at least one induction coil can be triggered to generate induced electromotive force by the detection moving part moving for a small displacement, so that the sensitivity of displacement detection is improved; the magnetic flux change rate in the magnetic conducting arm at the first side is increased through the magnetic second magnetic conducting arm, the amplitude of induced electromotive force is improved, and the sensitivity to detection speed is improved; the first side magnetic conduction arms which are mutually abutted and closely arranged enable the magnetic field of the magnet to be more densely changed in strength, and the strength difference of the magnetic field in strength alternation is reduced by the more densely changed magnetic conduction arms, so that the magnetic resistance is reduced; by widening the second side magnetic conduction arm, the time interval between the positive pulse and the negative pulse generated by the induction coil is kept, the time interval of two pulse resistances is shortened, more time is given to the detected moving piece to recover the influence caused by the pulse resistance, and the influence of the magnetic resistance on the moving state of the detected moving piece is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a magnetoelectric device according to an embodiment.

Fig. 2 is an exploded cross-sectional view of an embodiment.

Fig. 3 is an exploded view of an embodiment.

FIG. 4 is a schematic view of a rotor assembly according to an embodiment.

FIG. 5 is a schematic view of the magnetic pole distribution of the fan-ring magnet of a rotor according to an embodiment.

FIG. 6 is a cross-sectional view of a stator according to an embodiment.

Fig. 7 and 8 are schematic diagrams of an operation principle of the embodiment.

Fig. 9 is a schematic view of a stator core structure according to an embodiment.

Fig. 10 is a cross-sectional view of a second magnetoelectric device according to an embodiment.

FIG. 11 is a schematic diagram of a third embodiment.

Fig. 12 is an exploded view of the third embodiment.

Fig. 13 is a schematic view of an installation position of the third second side magnetic arm according to the embodiment.

FIG. 14 is a schematic diagram of the third embodiment.

Fig. 15 and 16 are schematic diagrams of the operation principle of the third embodiment.

FIG. 17 is a diagram illustrating a fourth exemplary embodiment.

FIG. 18 is a schematic structural diagram of the fifth embodiment.

Fig. 19 and 20 are schematic diagrams of the operation principle of the fifth embodiment.

FIG. 21 is a schematic view of a sixth installation position of the embodiment.

FIG. 22 is a schematic diagram of a sixth embodiment.

Wherein: 1. an upper end cover, 2, an upper iron core, 3, a middle iron core, 4, a lower iron core, 5, a lower end cover, 6, a rotor shaft, 7, an induction coil, 8, an upper bearing, 9, a rotor assembly, 10, an upper permanent magnet, 11, a lower permanent magnet, 12, a lower bearing, 13, a fan-ring iron core, 14, a fan-ring magnet, 15, an upper iron core ring, 16, a lower iron core ring, 17, a cylindrical connecting piece, 18, a fixing plate, 19, a second side magnetic arm, 20, a first side magnetic arm, 21, a magnetic ring, 22, a transmission connecting part, 23, a straight magnetic strip, 24, a moving piece, 25, a straight track, 26, a connecting rod, 27, an upper end magnetic conductor, 28, a lower end magnetic conductor, 29, a magnetic cap, 30, an upper straight magnetic strip, 31, a lower straight magnetic strip, 32, a connecting frame, 33, an S-shaped magnetic strip, 34, an S-shaped track, 35, a massage headstock, 36, a fixing connecting rod, 37, and.

Detailed Description

The following provides a more detailed description of the present invention, with reference to the accompanying drawings.

The first embodiment is as follows:

the utility model provides a magnetoelectric device of low magnetic resistance, as shown in fig. 1, this embodiment includes upper end cover 1, stator core, last permanent magnet 10, lower permanent magnet 11, a plurality of induction coil 7, lower end cover 5 and rotor assembly 9, and rotor assembly 9 includes rotor shaft 6, and rotor shaft 6 is connected with upper end cover 1 and lower end cover 5 through upper bearing 8 and lower bearing 12 respectively. The rotor shaft 6 is connected to a rotary motion member 24 and rotates with the rotary motion member 24, such as a drag wheel of an elevator, a car wheel, a fan impeller, and the like. The rotor shaft 6 is connected with the rotary moving part 24 through a belt, a synchronous belt or a chain, or is connected with the rotary moving part 24 by adopting a universal joint, or is fixedly connected with the rotary moving part 24, or the rotor shaft 6 and the rotary moving part 24 act as the rotor shaft, the stator core, the upper permanent magnet 10 and the lower permanent magnet 11 are used as the stator and are positioned at the outer side, the rotor assembly 9 is arranged inside, the embodiment can also adopt an embodiment that the stator is positioned at the inner side to rotate, and the rotor assembly 9 is positioned at the outer side to be fixed. As shown in fig. 9, the stator core includes an upper core 2, a middle core 3 and a lower core 4, the upper core 2 has a middle ring body and L-shaped magnetic arms uniformly diverging outward along the ring body, the lower core 4 and the upper core 2 have similar shapes, the middle core 3 has a ring body with a gap in the middle along the axial direction and column-shaped magnetic arms diverging along the ring body, each column-shaped magnetic arm is sleeved with an induction coil 7, the L-shaped magnetic arms of the upper core 2 and the L-shaped magnetic arms of the lower core 4 correspond to the column-shaped magnetic arms of the middle core 3 in number and position, and the L-shaped magnetic arms and the column-shaped magnetic arms are attached to each other to form a first side magnetic arm 20. As shown in fig. 2 and 3, the upper permanent magnet 10 and the lower permanent magnet 11 are both magnetic rings 21, the upper permanent magnet 10 is clamped between the upper iron core 2 and the middle iron core 3, the lower permanent magnet 11 is clamped between the lower iron core 4 and the middle iron core 3, the annular body in the middle of the upper iron core 2 covers the upper end face of the upper permanent magnet 10, the annular body in the middle of the lower iron core 4 covers the lower end face of the lower permanent magnet 11, and the annular body of the middle iron core 3 covers the lower end face of the upper permanent magnet 10 and the upper end face of the lower permanent magnet 11. As shown in fig. 4, the rotor assembly 9 further includes an upper core ring 15, a lower core ring 16, the magnetic rotor comprises a plurality of fan-ring iron cores 13 and a plurality of fan-ring magnets 14, wherein an upper iron core ring 15 and a lower iron core ring 16 are concentrically and fixedly installed on a rotor shaft 6, a plurality of fan-ring magnets 14 are circumferentially and fixedly arranged on two sides of the upper iron core ring 15 and two sides of the upper iron core ring 15, in the embodiment, four fan-ring magnets 14 are circumferentially and uniformly distributed, gaps are formed among the four fan-ring magnets 14 and are axially aligned along the rotor shaft 6, corresponding gaps are processed in the gaps of the upper iron core ring 15 and the lower iron core ring 16, one end face of each fan-ring magnet is connected with the upper iron core ring 15 or the lower iron core ring 16, the other end face of each fan-ring magnet is fixedly connected with the fan-ring iron core 13, the shape of the fan-ring iron core 13 is matched with the fan-ring magnets 14, and the upper iron core ring 15, the lower iron core ring 16, the fan-ring magnets 14 and the fan-ring iron cores 13 which are respectively. As shown in fig. 5, the magnetic pole directions of the sector ring magnets 14 are all along the axial direction of the rotor shaft 6, the magnetic pole directions of the adjacent sector ring magnets 14 located on the same side of the upper core ring 15 or the lower core ring 16 are opposite, and the magnetic pole directions of the sector ring magnets 14 located on the upper core ring 15 and aligned along the axial direction of the rotor shaft 6 are the same, but opposite to the magnetic pole directions of the sector ring magnets 14 located on the lower core ring 16 and aligned along the axial direction. As shown in fig. 6, the magnetic pole directions of the upper permanent magnet 10 and the lower permanent magnet 11 are both along the axial direction of the magnetic ring 21 and are the same.

The operation principle of the embodiment is as follows: taking a first side magnetic arm 20 as an example, when the magnetic pole direction of the sector ring magnet 14 of the upper core ring 15 rotated to the position of the first side magnetic arm 20 is opposite to the magnetic pole direction of the upper permanent magnet 10, the magnetic pole direction of the sector ring magnet 14 of the upper core ring 15 is the same as the magnetic pole direction of the lower permanent magnet 11, as shown in fig. 7. The magnetic induction line of the sector ring magnet 14 on the upper side of the upper iron core ring 15 starts from the north pole, passes through the sector ring iron core 13, then crosses the gap between the sector ring iron core 13 and the upper iron core 2, enters the annular body in the middle of the upper iron core 2, then enters the south pole of the upper permanent magnet 10, enters the annular body in the middle of the middle iron core 3, crosses the gap between the middle iron core 3 and the sector ring iron core 13 on the lower side of the upper iron core ring 15, enters the opposite drinking sector ring iron core 13, then enters the south pole of the sector ring magnet 14 on the same side as the sector ring iron core 13, and the magnetic flux path does not pass through the columnar magnetic guide arm of the middle iron core 3, namely does not pass through the induction coil 7; the magnetic induction lines of the sector ring magnet 14 at the lower side of the lower iron core ring 16 start from the north pole, pass through the sector ring iron core 13 at the lower side, then cross the gap between the sector ring iron core 13 and the lower iron core 4, enter the annular body at the middle part of the lower iron core 4, converge with the magnetic induction lines starting from the north pole of the lower permanent magnet 11, then enter the columnar magnetic guide arm of the middle iron core 3 through the L-shaped magnetic guide arm of the lower iron core 4, then enter the middle annular body of the middle iron core 3, part of the magnetic induction lines enter the south pole of the lower permanent magnet 11, the other part of the magnetic induction lines cross the gap between the middle iron core 3 and the sector ring iron core 13 at the upper side of the lower iron core ring 16, enter the south pole of the sector ring iron core 13, then enter the sector ring magnet 14 at the upper side of the lower iron core ring 16, the magnetic induction lines starting from the sector ring magnet 14 at the upper side of the lower iron core ring 16 enter the south pole of the sector ring magnet 14 at the lower iron ring 16, and the sector ring magnet 14 at, the direction of the magnetic induction line in the induction coil 7 is the outside to the inside of the core 3.

When the magnetic pole direction of the sector ring magnet 14 positioned on the upper core ring 15 rotated to the position of the first side magnetic arm 20 is the same as the magnetic pole direction of the upper permanent magnet 10, the magnetic pole direction of the sector ring magnet 14 positioned on the upper core ring 15 is opposite to the magnetic pole direction of the lower permanent magnet 11, as shown in fig. 8. At this time, the sector ring magnets 14 on both sides of the lower core ring 16 and the lower permanent magnet 11 form a small-sized magnetic path loop, and the magnetic induction lines thereof do not pass through the induction coil 7. The magnetic induction lines of the sector ring magnets 14 on both sides of the upper core ring 15 pass through the induction coil 7 together with the magnetic induction lines of the upper permanent magnets 10, and the direction of the magnetic induction lines is that the inner side of the middle core 3 points to the outer side, which is just opposite to the direction of the magnetic induction lines in the induction coil 7 in fig. 7. Thus, when the selected first side magnetic arm 20 undergoes alternation of the fan-ring core 13, a change in magnetic flux occurs, thereby generating an induced electromotive force, outputting an induced electromotive force pulse signal, the amplitude and time span of which reflect the speed of the rotor shaft 6 being sensed. Specifically, the induction coil 7 generating the induced electromotive force pulse signal reflects the angular displacement of the rotor shaft 6, and the sequence of the induced electromotive forces generated by the induction coil 7 reflects the rotation direction of the rotor shaft 6.

In this embodiment, the ring bodies in the middle of the upper core 2 and the lower core 4 and the ring body of the middle core 3 are good magnetic conductors, and the magnetic induction lines therein tend to be more uniform than the free space, so that the magnetic field distribution can be more uniform, the magnetic field intensity nonuniformity caused by the first side magnetic conduction arm 20 is reduced, and the magnetic resistance encountered by the fan-ring magnet 14 is reduced. The amount of change in the magnetic flux in the induction coil 7 is the sum of the magnetic field strengths of the upper permanent magnet 10, the lower permanent magnet 11, the fan-ring magnets 14 on both sides of the upper core ring 15, and the fan-ring magnets 14 on both sides of the lower core ring 16. The present embodiment thus improves the sensitivity of the detection of the rotational speed of the rotor shaft 6. The upper permanent magnet 10, the lower permanent magnet 11 and the fan ring magnet 14 with lower magnetic field intensity are adopted, so that better detection sensitivity can be obtained. The sensitivity of the present embodiment to the detection of the angular displacement of the rotor shaft 6 depends on the number of first side magnetically permeable arms 20 and induction coils 7 and the circumferential gap between the sector ring magnets 14. The larger the number of the first side magnetic arms 20, the smaller the circumferential gap between the sector ring magnets 14, and the higher the detection sensitivity of the angular displacement of the rotor shaft 6. Since the present embodiment has a magnetic field extending along the rotation path, when the number of the first side magnetic conductive arms 20 is increased, it does not cause the present embodiment that the upper permanent magnet 10 and the lower permanent magnet 11 provide a magnetic field extending along the movement path of the moving member 24 to be detected and diverging laterally to the movement path.

Example two:

the utility model provides a magnetic electric device of low magnetic resistance, this embodiment is the simplified implementation of embodiment one, as shown in fig. 10, this embodiment includes upper permanent magnet 10, go up iron core 2, well iron core 3, a plurality of induction coil 7, go up iron core ring 15, a plurality of fan ring magnet 14, a plurality of fan ring iron core 13 and rotor shaft 6, go up permanent magnet 10 card and go up between iron core 2 and the well iron core 3, induction coil 7 cover is on the column magnetic arm that diverges in the middle iron core 3 outside, go up iron core ring 15 and fix on rotor shaft 6 with one heart, go up iron core ring 15 both sides along circumference evenly distributed a plurality of fan ring magnet 14, fan ring magnet 14 terminal surface covers has fan ring iron core 13. The magnetic pole direction of the sector ring magnet 14 is along the axial direction of the rotor shaft 6, the magnetic pole direction of the adjacent sector ring magnets 14 is opposite, and uniform gaps exist among the sector ring magnets 14, the sector ring iron core 13, the upper iron core 2, the upper permanent magnet 10 and the middle iron core 3. The L-shaped magnetic arm of the upper core 2 and the cylindrical magnetic arm of the middle core 3 constitute a first side magnetic arm 20. The sector ring magnet 14 and the sector ring core 13 covered thereon constitute a second side magnetic arm 19. When the second side magnetic arm 19 at the position corresponding to the first side magnetic arm 20 is changed, the magnetic path thereof is also changed, the amount of change is twice the magnetic flux of the fan ring magnet 14, and the induced electromotive force generated thereby is output as a signal. In this embodiment, the upper permanent magnet 10 has the following alternatives: a nonmagnetic annular body is used instead of or directly to remove the upper permanent magnet 10.

Compared with the first embodiment, the present embodiment has the advantages of lower cost, small axial size and easier implementation. But has the disadvantage of a significantly reduced sensitivity compared to the first embodiment. Therefore, the embodiment is suitable for occasions with low requirements on sensitivity. Meanwhile, the present embodiment causes the upper permanent magnet 10 to lose its influence on the detection result, resulting in that it can be removed, and thus is a simplified implementation of the first embodiment with more obvious performance degradation.

Example three:

a low magnetic resistance magnetoelectric device, as shown in fig. 11, the embodiment has a cylindrical connecting piece 17 and a fixed plate 18, the cylindrical connecting piece 17 is connected with a rotary moving piece 24 through a transmission connecting part 22 at the center of the cylindrical connecting piece, and rotates along with the rotary moving piece 24. The stationary plate 18 is connected to the stationary structure of the rotary moving member 24. As shown in fig. 12, the present embodiment includes a plurality of second side magnetic arms 19 axially distributed along the cylindrical connecting member 17, a magnetic ring 21, a plurality of first side magnetic arms 20 closely arranged along the circumference of the inner ring of the magnetic ring 21, and a plurality of induction coils 7 distributed and sleeved on the first side magnetic arms 20, the magnetic ring 21 and the first side magnetic arms 20 are fixedly connected with the fixing plate 18, and the second side magnetic arms 19 are fixedly connected with the cylindrical connecting member 17 and rotate with the rotating member 24. As shown in fig. 13, the present embodiment employs four second side magnetic arms 19 uniformly distributed along the inner wall of the cylindrical connecting member 17. As shown in fig. 14, the inner side of the second side magnetic conduction arm 19 has a uniform gap with the magnetic ring 21, two ends of the first side magnetic conduction arm 20 are respectively located at two ends of the magnetic ring 21, two ends of the plurality of first side magnetic conduction arms 20 together completely cover two ends of the magnetic ring 21, the length of the second side magnetic conduction arm 19 along the axial direction of the magnetic ring 21 is substantially the same as that of the first side magnetic conduction arm 20, and the span of the second side magnetic conduction arm 19 along the circumferential direction of the magnetic ring 21 is larger than that of the first side magnetic conduction arm 20. As shown in fig. 15, when the second side magnetic arm 19 is disposed at the position of the first side magnetic arm 20, the first side magnetic arm 20 and the second side magnetic arm 19 jointly form a magnetic path, and a magnetic induction line starting from the north pole of the magnetic ring 21 is divided into two paths, and the two paths respectively pass through the first side magnetic arm 20 and the second side magnetic arm 19 and return to the south pole of the magnetic ring 21; as shown in fig. 16, when the second side magnetic arm 19 at this position is separated, the magnetic path is left only by the first side magnetic arm 20, and therefore all the magnetic induction lines pass through the first side magnetic arm 20, the magnetic flux in the first side magnetic arm 20 is changed, and the induction coil 7 generates an induced electromotive force pulse as a signal.

The following rotating parts in this embodiment are on the outside, and the first side magnetic arm 20 and the magnetic ring 21 as the stator are on the inside. In the present embodiment, the rotational angular velocity detection sensitivity is determined by the magnetic permeability of the second side magnetic arm 19, the magnetic field strength of the magnetic ring 21, and the number of turns of the induction coil 7. The first side magnetic arm 20 is a good magnetic conductor, and the magnetic induction lines in the first side magnetic arm have a tendency of going to be uniform faster than that in a free space, so that the magnetic field distribution can be more uniform, the non-uniformity of the magnetic field intensity caused by the first side magnetic arm 20 is reduced, and the magnetic resistance encountered by the fan-ring magnet 14 is reduced.

The present embodiment also has the following alternatives: the first and second magnetic arms are magnetic, and the magnetic ring 21 is removed. The second magnetic conduction arms are densely arranged, and the adjacent second magnetic conduction arms have different magnetic conductivities, wherein the different magnetic conductivities are realized by adopting the following modes: the adjacent second magnetic conduction arms adopt the gap size different from that of the first magnetic conduction arms; different materials are adopted; the magnetic second side magnetic conduction arms 19 with magnetism are adopted, and the magnetic field intensity or the magnetic pole direction of the adjacent second side magnetic conduction arms 19 is different; the middle part of the second magnetic conduction arm is provided with a narrowing section, and the adjacent second magnetic conduction arms are provided with narrowing sections with different narrowing degrees.

Example four:

a low reluctance magnetoelectric device is suitable for detecting the speed and displacement of a moving element 24 moving along a straight line. Such as for a beam crane that reciprocates along a straight rail 25. As shown in fig. 17, the magnetic sensor includes a straight magnetic stripe 23, a plurality of first side magnetic arms 20 and second side magnetic arms 19 densely arranged along the left side of the straight magnetic stripe 23, the first side magnetic arms 20 are C-shaped, and the plurality of first side magnetic arms 20 are all sleeved with the induction coil 7. The two end parts of the first side magnetic conduction arm 20 are covered with the straight magnetic strips 23, the second side magnetic conduction arm 19 is C-shaped, and the two ends of the second side magnetic conduction arm 19 and the first side magnetic conduction arm 20 have uniform gaps. The second side magnetic guide arm 19 is fixedly connected with the linear motion member 24 through a connecting rod 26, and the linear motion member 24 reciprocates along the straight track 25. When the first side magnetic arm 20 is coupled with the second side magnetic arm 19, the first side magnetic arm 20 and the second side magnetic arm 19 both form a magnetic path, and the magnetic induction lines at the corresponding positions start from the north pole of the straight magnetic strip 23 and are divided into two paths, and the two paths respectively pass through the first side magnetic arm 20 and the second side magnetic arm 19 and then return to the south pole of the straight magnetic strip 23. When the second side magnetic arm 19 is coupled with the first side magnetic arm 20 and is separated, the magnetic flux path is left by the first side magnetic arm 20, and the magnetic induction lines at the position pass through the first side magnetic arm 20, so that the magnetic flux passing through the induction coil 7 is increased, and the induction coil 7 generates induced electromotive force to be output as a signal. The magnitude of the induced electromotive force reflects the moving speed of the linear motion member 24. The position of the induction coil 7 generating the induced electromotive force reflects the position of the linear motion member 24, and the direction of the induction coil 7 sequentially generating the induced electromotive force reflects the moving direction of the linear motion member 24. The sensitivity of the present embodiment to displacement detection is dependent on the number of first side magnetically permeable arms 20, independent of the number and size of second side magnetically permeable arms 19.

If the two ends of the first side magnetic arm 20 of this embodiment completely cover the two ends of the straight magnetic strip 23, the second side magnetic arm 19 may be in a straight strip shape. The magnetic field intensity utilization rate of the straight magnetic strip 23 is increased, and the instantaneous magnetic resistance force applied when the motion direction or the motion speed of the second side magnetic conduction arm 19 changes is reduced.

Example five:

as shown in fig. 18, the present embodiment includes a plurality of second side magnetic arms 19, a connecting frame 32, an upper straight magnetic strip 30, a lower straight magnetic strip 31, an upper end magnetizer 27, a lower end magnetizer 28, and a plurality of first side magnetic arms 20, and the magnetic pole directions of the upper straight magnetic strip 30 and the lower straight magnetic strip 31 are the same. First side magnetic conduction arm 20 is E shape, go up straight magnetic stripe 30 and lower straight magnetic stripe 31 and imbed respectively in two notches of first side magnetic conduction arm 20E shape, the middle part xarm of first side magnetic conduction arm 20E shape all overlaps has induction coil 7, upper end magnetizer 27 covers straight magnetic stripe 30 up end, lower extreme magnetizer 28 covers the lower terminal surface of straight magnetic stripe 31 down, the higher authority of the middle part xarm of first side magnetic conduction arm 20E shape covers the lower terminal surface of straight magnetic stripe 30 and the up end of straight magnetic stripe 31 down respectively below with, the middle part of first side magnetic conduction arm 20E shape covers on the xarm straight magnetic stripe 30 and the lower straight magnetic stripe 31 part is opened jaggedly along the middle part. The induction coil 7 is sleeved between the notch and the E-shaped vertical arm. The second side magnetic arms 19 are divided into an upper group and a lower group corresponding to the upper straight magnetic strip 30 and the lower straight magnetic strip 31 respectively, and the second side magnetic arms 19 are straight strips. And magnetic guiding caps 29 are fixed at both ends of the second side magnetic guiding arm 19. The adjacent second side magnetic conduction arms 19 in the same group have opposite magnetic pole directions, and the second side magnetic conduction arms 19 aligned up and down have opposite magnetic pole directions. This embodiment uses four second side magnetic arms 19. The four second side magnetic arms 19 are fixedly connected with each other by a connecting frame 32, and the connecting frame 32 is fixedly connected with the linear motion member 24.

Taking one first side magnetic arm 20 as an example, as shown in fig. 19, in two second side magnetic arms 19 coupled to the first side magnetic arm 20, the magnetic poles of the upper group of second side magnetic arms 19 are in the same direction as the magnetic poles of the upper magnetic strip, and the magnetic poles of the lower group of second side magnetic arms 19 are in the opposite direction to the magnetic poles of the lower magnetic strip. The second side magnetic conductive arm 19 of the lower set forms a local magnetic circuit loop with the lower magnetic strip. After entering the upper end magnetizer 27 through the magnetic guiding cap 29, the magnetic induction line from the north pole of the second side magnetic conduction arm 19 of the upper group passes through the upper part of the first side magnetic conduction arm 20 together with the magnetic induction line from the north pole of the upper magnetic stripe, enters the middle part of the first side magnetic conduction arm 20, passes through the induction coil 7, then returns to the south pole of the upper magnetic stripe, and returns to the south pole of the second side magnetic conduction arm 19 through the magnetic guiding cap 29 at the lower end of the second side magnetic conduction arm 19 of the upper group. At this time, the magnetic flux passing through the induction coil 7 is the sum of the magnetic induction lines of the upper magnetic strip and the second side magnetic arm 19 of the upper group, and the direction is that the first side magnetic arm 20 points to the second side magnetic arm 19. When the second side magnetic conductive arm 19 coupled with the first side magnetic conductive arm 20 is changed by the driving of the linear motion member 24, the magnetic poles of the second side magnetic conductive arm 19 of the upper group are opposite to the magnetic poles of the upper magnetic strip, and the magnetic poles of the second side magnetic conductive arm 19 of the lower group are in the same direction as the magnetic poles of the lower magnetic strip, as shown in fig. 20. The second side magnetic conductive arm 19 of the upper group forms a local magnetic circuit loop with the upper magnetic strip. The magnetic induction lines of the second side magnetic conductive arm 19 and the lower magnetic stripe of the lower group pass through the induction coil 7, so that the magnetic flux in the induction coil 7 is changed, and induced electromotive force pulses are generated and output as signals. The magnitude of the induced electromotive force reflects the moving speed of the linear motion member 24. The position of the induction coil 7 generating the induced electromotive force reflects the position of the linear motion member 24, and the direction of the induction coil 7 sequentially generating the induced electromotive force reflects the moving direction of the linear motion member 24. The sensitivity of the present embodiment to displacement detection is dependent on the number of first side magnetically permeable arms 20, independent of the number and size of second side magnetically permeable arms 19.

Example six:

a low reluctance magnetoelectric device, the embodiment is suitable for detecting the moving part 24 moving along an S-shaped track 34, such as the massage head position tracking used for an S-shaped massage chair. As shown in fig. 21, the present embodiment includes an S-shaped magnetic stripe 33, a plurality of first side magnetic arms 20, a plurality of second side magnetic arms 19, four S-shaped end magnetic conductors 37, a connecting frame 32 and a fixing connecting rod 36, wherein the massage head frame 35 reciprocates along the S-shaped track 34, the shape of the S-shaped magnetic stripe 33 is the same as that of the S-shaped track 34, and the position is obtained by translating the S-shaped track 34. The second side magnetic conduction arms 19 are all fixed on the connecting frame 32, magnetic conduction caps 29 are fixed at both ends of the second side magnetic conduction arms 19, and the connecting frame 32 is fixedly connected with the massage head frame 35 through a fixed connecting rod 36. As shown in fig. 22, the present embodiment uses two S-shaped magnetic strips 33 aligned up and down, and the magnetic pole directions of the S-shaped magnetic strips 33 are the same. The first side magnetic conduction arms 20 are closely arranged along the left sides of the two S-shaped magnetic stripes 33, and the first side magnetic conduction arms 20 are E-shaped. The two S-shaped magnetic strips 33 are respectively embedded into the two notches of the first side magnetic conducting arm 20E, and the four S-shaped end magnetizers 37 respectively cover the upper end face and the lower end face of the two S-shaped magnetic strips 33. The middle cross arms of the first side magnetic conduction arms 20E are all sleeved with induction coils 7. The second side magnetic conduction arms 19 are straight bars, and the plurality of second side magnetic conduction arms 19 are divided into an upper group and a lower group which correspond to the two S-shaped magnetic stripes 33 respectively. The adjacent second side magnetic conduction arms 19 in the same group have opposite magnetic pole directions, and the second side magnetic conduction arms 19 aligned up and down have opposite magnetic pole directions. This embodiment has adopted four second side magnetic conduction arms 19, and four second side magnetic conduction arms 19 are all fixed mounting on the mounting bracket. The side surface of the second side magnetic conduction arm 19 close to the S-shaped magnetic strip 33 is tangent to the side surface of the S-shaped magnetic strip 33. When the second side magnetic arm 19 moves along with the massage head 35, it will be periodically coupled with the first side magnetic arm 20 and cause the magnetic flux in the corresponding first side magnetic arm 20 to change, so as to generate an induced electromotive force pulse as a signal output. The S-shaped end magnetizer 37 can fold the magnetic induction lines of the S-shaped magnetic stripe 33, and can make full use of the magnetic field strength of the S-shaped magnetic stripe 33. The flux cap 29 serves to improve the utilization of the magnetic field to the second side flux arm 19. The sensitivity of the present embodiment for the position detection of the massage head frame 35 depends on the number of the first side magnetic conductive arms 20 and the gap of the second side magnetic conductive arms 19. The larger the number of the first side magnetic arms 20, the smaller the gap of the second side magnetic arms 19, and the higher the sensitivity of the position detection of the massage head frame 35. The S-shaped end magnetizer 37 is a good magnetic conductor, and the magnetic induction lines therein have a tendency of being more uniform than a free space, so that the magnetic field distribution can be more uniform, the non-uniformity of the magnetic field intensity caused by the first side magnetic conduction arm 20 is reduced, and the magnetic resistance encountered by the second side magnetic conduction arm 19 is reduced.

The above-described embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications may be made without departing from the spirit of the invention as set forth in the claims.

Claims

1. A low-magnetic-resistance magnetoelectric device is used for detecting a moving part and is characterized in that,

the method comprises the following steps:

a magnet for providing a magnetic field extending along a movement path of the moving member to be detected and diverging laterally of the movement path;

the first side magnetic conduction arms are arranged along the extension direction of the magnetic field, are connected with two magnetic poles of the magnetic field at the first side of the extension direction of the magnetic field and are used for forming a first side magnetic path;

the second side magnetic conduction arm is connected with the moving part and moves along with the moving part relative to the first side magnetic conduction arm, and the second side magnetic conduction arm and the first side magnetic conduction arm are periodically coupled to form a magnetic path in the moving process so that the magnetic flux of the first side magnetic conduction arm generates periodic change;

the induction coils are sleeved on the first side magnetic conduction arms, induce the magnetic flux change in the first side magnetic conduction arms and output electromotive force signals;

the detected moving piece is a rotating moving piece;

the magnet is a magnetic ring, and the magnetic pole of the magnetic ring is along the axial direction of the magnetic ring;

the first side magnetic conduction arms are distributed along the inner circular surface or the outer circular surface of the magnetic ring, two ends of each first side magnetic conduction arm are respectively coupled with two magnetic poles of the magnetic ring, each second side magnetic conduction arm is a sector ring body with the thickness along the axial direction of the magnetic ring, each second side magnetic conduction arm is positioned on one side of the magnetic ring opposite to the corresponding first side magnetic conduction arm, each second side magnetic conduction arm is connected with the rotary motion part through a connecting piece and rotates along with the rotary motion part, and a rotating shaft of each second side magnetic conduction arm and a central shaft of the sector ring body are coaxial with the magnetic ring;

the two ends of the first side magnetic conduction arm cover or partially cover the two end faces of the magnetic ring, the two end faces of the first side magnetic conduction arm are arc faces coaxial with the magnetic ring, and the second side magnetic conduction arm is provided with a coupling part which forms a uniform gap with the two end faces of the first side magnetic conduction arm;

the second side magnetic conduction arm has magnetism, and a magnetic pole of the second side magnetic conduction arm is in the axial direction of the magnetic ring;

the magnetoelectric device comprises a plurality of second side magnetic conduction arms which are uniformly distributed along the circumferential direction of the rotation center of the rotary motion part, two end faces of the second side magnetic conduction arms are respectively flush, and the magnetic pole directions of the adjacent second side magnetic conduction arms are opposite;

the magneto-electric device comprises two magnetic rings and two end magnetizers, the two magnetic rings are concentric and have the same magnetic pole direction, the first side magnetic arms are respectively provided with an upper arm, a middle arm, a lower arm and a connecting arm, the connecting arm is connected with the first ends of the upper arm, the middle arm and the lower arm, the induction coil is sleeved on the middle arm, the first end magnetizer covers the upper end surface of the first magnetic ring, the lower end surface of the first magnetic ring is covered by the upper surface of the middle arm, the upper arm is connected with the first end magnetizer, the second end magnetizer covers the lower end surface of the second magnetic ring, the upper end surface of the second magnetic ring is covered by the lower surface of the middle arm, the lower arm is connected with the second end magnetizer, a notch is machined in the middle of the middle arm in the thickness direction of the magnetic rings, and the inner walls of the two end magnetizers and the second end surface of the middle arm;

the magnetic pole direction of the second side magnetic conduction arms aligned along the axial direction of the magnetic ring is opposite, the thickness of the first group of second side magnetic conduction arms covers the upper surface of the first end magnetizer to the upper edge of the notch of the middle arm, the thickness of the second group of second side magnetic conduction arms covers the lower surface of the second end magnetizer to the lower edge of the notch of the middle arm, and a gap exists between the second side magnetic conduction arms and the inner wall of the magnetic ring.

2. A low reluctance magnetoelectric device according to claim 1,

the second side magnetic conduction arm has magnetism.

3. A low reluctance magnetoelectric device according to claim 1 or 2,

the magnetic pole type permanent magnet synchronous motor further comprises two end magnetizers used for drawing the magnetic fields at the two magnetic poles of the magnet, and the first side magnetic conduction arm and the second side magnetic conduction arm are coupled with the two magnetic poles of the magnetic field through the two end magnetizers.

4. A low reluctance magnetoelectric device according to claim 1 or 2,

first side magnetic conduction arm both ends are equipped with the spread width portion, and adjacent spread width portion butt each other.

5. A low reluctance magnetoelectric device according to claim 2,

the span of the second side magnetic conduction arm along the motion path is larger than that of the first side magnetic conduction arm along the motion path.

6. A low reluctance magnetoelectric device according to claim 2 or 5,

the magnetoelectric device comprises two magnets and a plurality of second side magnetic conduction arms, the second side magnetic conduction arms of the plurality of are divided into two groups aligned with the two magnets respectively, the magnetic poles of the second side magnetic conduction arms adjacent to each other in the same group are opposite in direction, and the magnetic poles of the second side magnetic conduction arms aligned in the direction of the connecting line of the two magnets are opposite in direction.