CN220774060U - Magnetic steel demagnetizing device - Google Patents

Abstract

The utility model provides a magnetic steel demagnetizing device, which comprises a coil frame, a controller and a current detection piece, wherein the controller is fixed on the coil frame and is electrically connected with an external power supply; the hollow part in the middle of the coil frame is used for allowing a conveyor belt made of an external non-magnetic material to pass through; the coil is wound at the inner ring of the coil frame, extends along the conveying direction of the conveying belt, is electrically connected with the controller and the current detection part, and is used for generating a magnetic field after being electrified; when the magnetic steel to be demagnetized passes through the coil, the current detection piece detects the induction current; the controller is used for electrifying the coil according to the induced current detected by the current detection piece, so that the coil generates a magnetic field which is opposite to the magnetic pole of the magnetic steel to be demagnetized and has the same magnetic flux; the utility model can effectively demagnetize the magnetic steel.

Description

Magnetic steel demagnetizing device

Technical Field

The utility model relates to the technical field of motors, in particular to a magnetic steel demagnetizing device.

Background

Demagnetization, also known as demagnetizing, is a way to reduce or eliminate the remanence of permanent magnets. In the field of permanent magnet synchronous motors, magnetic steel often needs to undergo magnetizing and demagnetizing processes. The traditional magnetic steel demagnetizing usually adopts an alternating current attenuation method, and the principle of the method is that the magnetic steel is placed in an alternating magnetic field, the demagnetizing is carried out by utilizing a hysteresis loop to decrease, the magnetic field reversing and the attenuation are carried out simultaneously, and the track of the hysteresis loop is smaller and smaller along with the gradual attenuation of the amplitude of the alternating magnetic field. When the alternating magnetic field is gradually attenuated to zero, the residual magnetism in the magnetic steel is close to zero, and when the method is used for coping with demagnetization of rare earth magnetic steel, the generated alternating magnetic field is rapidly attenuated, so that the magnetic steel generally still has larger residual magnetic induction intensity, and the demagnetization effect is not ideal.

Disclosure of Invention

The utility model solves the problems that: the magnetic steel demagnetizing device is simple in structure and reasonable in design, and can facilitate workers to demagnetize magnetic steel repeatedly until the remanence of the magnetic steel is close to zero.

In order to solve the above problems, the present utility model provides a magnetic steel demagnetizing device, which includes a coil frame, a controller fixed on the coil frame and electrically connected to an external power source, and a current detecting member fixed on the coil frame and electrically connected to the controller; the hollow part in the middle of the coil frame is used for allowing a conveyor belt made of an external non-magnetic material to pass through; the coil is wound at the inner ring of the coil frame, extends along the conveying direction of the conveying belt, is electrically connected with the controller and the current detection part, and is used for generating a magnetic field after being electrified; when the magnetic steel to be demagnetized passes through the coil, the current detection piece detects the induction current; the controller is used for electrifying the coil according to the induced current detected by the current detection piece, so that the coil generates a magnetic field which is opposite to the magnetic pole of the magnetic steel to be demagnetized and has the same magnetic flux.

The utility model has the beneficial effects that the magnetic steel to be demagnetized can be arranged on the conveyor belt according to the same magnetic pole direction by a worker, when the conveyor belt passes through the coil, the current detection part induces the induction current due to the alternating current generated by electromagnetic induction, the current detection part can feed back information to the controller, the controller controls the electrifying of the coil after receiving the feedback information, the coil is fully distributed with current, the corresponding magnetic field can be generated around the coil due to the electromagnetic induction, the magnetic poles of the magnetic field are opposite to the magnetic poles of the magnetic steel to be demagnetized, the magnetic flux is the same, a part of magnetic force can be removed when the magnetic steel to be demagnetized passes through the coil for the first time, and the worker can take the magnetic steel passing through the coil back to the starting point of the conveyor belt again for secondary demagnetization.

Further, a hole channel penetrating to the coil is formed in the coil frame, and a cooling fan for cooling the coil is fixed at the hole channel.

The beneficial effect of this setting is, can effectively dispel the heat for the coil.

Further, the coil frame fixing device also comprises a base for fixing the coil frame.

The beneficial effect of this setting is, can provide coil frame certain height, makes the fretwork department of coil frame can flush with the conveyer belt, makes things convenient for the conveyer belt to pass through.

Further, a display screen is fixedly arranged on the base and is electrically connected with the controller.

The beneficial effect of this setting is, whether still has magnetism in showing current magnet steel, makes things convenient for the staff to observe.

Further, the coil frame and the base are integrally formed.

The beneficial effect that this setting is, and the coil former is located more firm on the base, detects more stably.

Drawings

FIG. 1 is a schematic perspective view of the present utility model;

FIG. 2 is a schematic diagram of a coil of the present utility model;

FIG. 3 is a cross-sectional view of the coil frame of the present utility model in a front view;

reference numerals illustrate:

the device comprises a 1-coil frame, a 2-controller, a 3-current detection part, a 4-base, an 11-coil, a 12-cooling fan, a 31-display screen and a 111-duct.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., are based on directions or positional relationships shown in the drawings, or directions or positional relationships in which the inventive product is conventionally put in use, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present utility model. In fig. 1 of the drawings, a coordinate system XYZ is provided in an embodiment of the present utility model, wherein the forward direction of the X axis represents the front, the backward direction of the X axis represents the rear, the forward direction of the Y axis represents the right, the backward direction of the Y axis represents the left, the forward direction of the Z axis represents the upper, and the backward direction of the Z axis represents the lower.

The embodiment provides a magnetic steel demagnetizing device, which comprises a coil frame 1, a controller 2 fixed on the coil frame 1 and electrically connected with an external power supply, and a current detection piece 3 fixed on the coil frame 1 and electrically connected with the controller 2; the hollow part in the middle of the coil frame 1 is used for allowing a conveyor belt 100 made of an external non-magnetic conductive material to pass through; a coil 11 is wound at the inner ring of the coil frame 1, the coil 11 is arranged in an extending way along the conveying direction of the conveying belt 100, the coil 11 is electrically connected with the controller 2 and the current detection piece 3, and the coil 11 is used for generating a magnetic field after being electrified; when the magnetic steel to be demagnetized passes through the coil 11, the current detecting element 3 detects an induced current; the controller 2 is configured to energize the coil 11 according to the induced current detected by the current detecting member 3, so that the coil 11 generates a magnetic field having the same magnetic flux and opposite to the magnetic pole of the magnetic steel to be demagnetized.

Specifically, the present embodiment provides two detection methods: the first method is a demagnetizing method for detecting magnetic poles, and specifically comprises the following steps: the magnetic steels to be demagnetized are sequentially arranged along the length direction of the conveyor belt 100, a certain gap is reserved between each two magnetic steels to be demagnetized, and the length, the conveying speed and the gap between the magnetic steels to be demagnetized of the conveyor belt 100 can be flexibly adjusted according to actual conditions; at this time, the magnetic steel to be demagnetized passing through the coil 11 can generate induction current due to electromagnetic induction, the current detection part 3 can detect the induction current and the direction of the induction current, the current detection part can detect the induction current to indicate that magnetic force exists in the magnetic steel to be demagnetized currently, the direction of the induction current is a magnetic pole, the controller 2 can electrify the coil 11 according to the induction current detected by the current detection part 3 and the direction of the induction current, so that the coil 11 generates a magnetic field which is opposite to the magnetic pole of the magnetic steel to be demagnetized and has the same magnetic flux, a part of the magnetic force can be removed when the magnetic steel to be demagnetized is transmitted for the first time, and a worker can take the magnetic steel passing through the coil 11 back to the starting point of the conveyor belt again to demagnetize for the second time. The second method is a method requiring pre-detection of magnetic poles, specifically: the staff needs to mark the magnetic pole direction on the demagnetizing magnetic steel in advance, arrange all the magnetic steels to be demagnetized according to the fixed magnetic pole direction and along the length direction of the conveyor belt 100, and a certain gap is reserved between each magnetic steel to be demagnetized, and the length, the conveying speed and the gap between the magnetic steels to be demagnetized of the conveyor belt 100 can be flexibly adjusted according to actual conditions; for example, all the magnetic steels to be demagnetized have N poles facing forward and S poles facing backward; or all the magnetic steels to be demagnetized have S poles facing forward and N poles facing backward; at this time, the magnetic steel to be demagnetized passing through the coil 11 will generate an induced current due to electromagnetic induction, but the current detecting element 3 can detect the induced current without detecting the magnetic pole direction, which indicates that the magnetic force exists in the current magnetic steel to be demagnetized, and the controller 2 can energize the coil 11 according to the induced current detected by the current detecting element 3, so that the coil 11 generates a magnetic field opposite to the magnetic pole of the magnetic steel to be demagnetized and the magnetic flux is the same, so that the coil is to be demagnetized. The demagnetizing magnetic steel can remove a part of magnetic force when being transmitted for the first time, and a worker can take the magnetic steel passing through the coil 11 back to the starting point of the conveyor belt again at the moment to carry out secondary demagnetization. The two methods can be flexibly selected and adjusted according to practical situations by a person skilled in the art.

In the preferred embodiment of the present utility model, the coil frame 1 is provided with a hole 111 penetrating to the coil 11, and a heat dissipation fan 12 for dissipating heat from the coil 11 is fixed to the hole 111.

Specifically, as shown in fig. 1, the number of the hole channels 111 and the number of the heat dissipation fans 12 may be only one, and the heat dissipation fans 12 are disposed on the upper side of the coil frame 1, the heat dissipation fans 12 are fixed on the inner side wall of the upper end of the hole channels 111, and the upper end of the heat dissipation fans 12 may be connected through a protection cover, so that the heat dissipation fans 12 can effectively dissipate heat of the coil 11; a plurality of holes 111 may be formed in the circumferential direction of the outer circumferential wall of the coil frame 1, and the heat radiation fan 12 may be fixed to the inner side wall of the upper end of each hole 111, so that the coil 11 can uniformly radiate heat.

In a preferred embodiment of the utility model, a base 4 for the fixed placement of the coil former 1 is also included.

Specifically, four supporting feet are fixed on the lower surface of the base 4, are uniformly distributed along the circumferential direction of the lower surface of the base 4, and are fixedly connected with a fixed beam which is horizontally arranged between every two adjacent supporting feet; the base 4 may provide the coil frame 1 with a height such that the hollowed out portion of the coil frame 1 can be flush with the conveyor belt 100 for the conveyor belt 100 to pass normally.

In the preferred embodiment of the present utility model, the display 31 is fixedly disposed on the base 3, and the display 31 is electrically connected to the controller 2.

Specifically, whether magnetism exists in the magnetic steel or not, namely whether the current detection part 3 can detect the induced current or not, whether the current detection part 3 can detect the induced current or not can be displayed on the display screen 31, and convenience is brought to a worker to judge whether magnetism exists in the current magnetic steel or not.

In a preferred embodiment of the utility model, the coil former 1 is integrally formed with the base 4. This makes the coil frame 1 more firmly placed on the base 4 and more stable in detection.

Although the present disclosure is described above, the scope of protection of the present disclosure is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications will fall within the scope of the utility model.

Claims (5)

1. The magnetic steel demagnetizing device is characterized by comprising a coil frame (1), a controller (2) fixed on the coil frame (1) and electrically connected with an external power supply, and a current detection piece (3) fixed on the coil frame (1) and electrically connected with the controller (2); the middle hollow part of the coil frame (1) is used for allowing a conveyor belt (100) made of an external non-magnetic conductive material to pass through; a coil (11) is wound at the inner ring of the coil frame (1), the coil (11) extends along the conveying direction of the conveying belt (100), the coil (11) is electrically connected with the controller (2) and the current detection piece (3), and the coil (11) is used for generating a magnetic field after being electrified; when the magnetic steel to be demagnetized passes through the coil (11), the current detection piece (3) detects induction current; the controller (2) is used for electrifying the coil (11) according to the induction current detected by the current detection piece (3) so that the coil (11) generates a magnetic field with opposite magnetic poles and same magnetic flux as the magnetic steel to be demagnetized.

2. The magnetic steel demagnetizing device according to claim 1, characterized in that the coil frame (1) is provided with a hole channel (111) penetrating to the coil (11), and a heat radiation fan (12) for heat radiation of the coil (11) is fixed at the hole channel (111).

3. A magnetic steel demagnetizing device according to claim 1 or 2, further comprising a base (4) for the coil frame (1) to be fixedly placed.

4. A magnetic steel demagnetizing device according to claim 3, characterized in that a display screen (31) is fixedly arranged on the base (4), and the display screen (31) is electrically connected with the controller (2).

5. A magnetic steel demagnetizing device according to claim 3, characterized in that the coil frame (1) is integrally formed with the base (4).