CN116495653A - Motor axial magnetic flux brake and motor manufactured by same - Google Patents

Abstract

The invention relates to a motor axial magnetic flux brake and a motor made thereof, wherein the motor axial magnetic flux brake has a hollow inside, and the rotating shaft of the motor passes through the hollow part of the motor axial magnetic flux brake, and The axial magnetic flux brake of the motor is connected with the rotating shaft of the motor through a flat key. The axial magnetic flux brake of the motor includes a non-magnetic laminated body. The non-magnetic laminated body and the rotating shaft of the motor are connected by a spline. The outside of the body is provided with pits, and the magnetic iron core is fixed in the pits. Compared with the prior art, the technical effect of the present invention is that the present invention is provided with an armature plate, which is connected to the rotating shaft through a spline, and through its axial movement on the rotating shaft, the attraction and release of the brake are realized.

Description

Motor Axial Flux Brake and Motor Made of It

technical field

The invention relates to a motor axial magnetic flux brake used in a hoisting motor of a crane electric hoist and a motor made thereof.

Background technique

Wire rope electric hoist hoisting motor brake mostly adopts DC power supply electromagnetism disc type brake now, referring to the patent document that publication number is CN104817026A.

This kind of brake is installed at the non-shaft extension end of the motor, so that the overall axial dimension of the motor is longer; the brake uses a separate excitation coil (the excitation coil plus the motor's own coil is two coils) to generate magnetic flux, which increases the overall mass of the motor; The DC power supply is supplied by the external AC through the rectifier, which increases the failure link.

The question is: how to invent a new brake that no longer depends on DC power supply.

Contents of the invention

The technical problem to be solved by the present invention is: how to design a motor axial flux brake, which reduces one coil and no longer depends on DC power supply.

Technical scheme of the present invention is specifically:

An axial magnetic flux brake of a motor, the interior of which is hollow, the rotating shaft of the motor passes through the hollow part of the axial magnetic flux brake of the motor, and the axial magnetic flux brake of the motor is connected with the rotating shaft of the motor through a flat key, The axial magnetic flux brake of the motor includes a non-magnetic lamination body, which is connected with the shaft of the motor through a spline. There is a pit on the outside of the non-magnetic lamination body, and a magnetic iron core is fixed in the pit. The end of the lamination close to the rotor is fixed with the non-magnetic end plate A, the non-magnetic lamination and the armature plate are fixed together by the non-magnetic core rivet, and the non-magnetic core rivet passes through the through hole of the non-magnetic lamination , the non-magnetic end plate B is fixed between the non-magnetic laminated body and the armature disc, the magnetic iron core is in contact with the armature disc, the armature disc and the friction disc A are fixed together, and the friction disc B is set on the right side of the friction disc A, and the friction The contact surface of disk A and friction disk B is the braking surface, and the hollow part of the magnetic iron core is provided with a compression spring.

The braking surface is made of composite friction material.

The armature disc and the friction disc A are fixed together by a plurality of fastening screws.

A motor, comprising a ring-shaped motor stator, a motor rotor made of cast aluminum is pierced in the motor stator, the right end of the motor stator extends outwards to form a motor stator extension, and the above-mentioned motor shaft is pierced in the motor stator extension The axial magnetic flux brake of the motor is connected with the rotating shaft of the motor by a flat key, the axial magnetic flux brake of the motor, the magnetic iron core and the rotating shaft of the motor are connected by a spline, and the friction disc B is fixed on the on the motor stator or motor casing.

Compared with the prior art, the technical effect of the present invention is that the present invention is provided with an armature plate, which is connected to the rotating shaft through a spline, and through its axial movement on the rotating shaft, the attraction and release of the brake are realized.

Description of drawings

Fig. 1 is a schematic cross-sectional view of the present invention.

Fig. 2 is a schematic diagram of the distribution of magnetic lines of force in the present invention.

FIG. 3 is a schematic left view of the distribution of magnetic force lines at the rotor in FIG. 2 .

FIG. 4 is a schematic left view of the distribution of magnetic force lines at the magnetic core in FIG. 2 .

Fig. 5 is a schematic diagram of the motor axial flux brake of the present invention.

FIG. 6 is a schematic diagram of FIG. 5 with one magnetic core 5 removed.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments thereof.

As shown in Figure 1, a motor includes a ring-shaped motor stator 51 (only the upper part of the motor stator 51 is drawn in the accompanying drawing 1, and the lower part is omitted), and the motor rotor 50 made of cast aluminum is passed through the motor stator 51 , the right end of the motor stator 51 extends outward to form a motor stator extension 511 , and a motor axial flux brake passes through the motor stator extension 511 .

An axial magnetic flux brake of a motor, the interior of which is hollow, the rotating shaft of the motor passes through the hollow part of the axial magnetic flux brake of the motor, and the axial magnetic flux brake of the motor is connected with the rotating shaft of the motor through a flat key, The axial magnetic flux brake of the motor includes a non-magnetic lamination body 1, which is connected with the rotating shaft of the motor through a spline, and a pit 12 is arranged on the outside of the non-magnetic lamination body 1, and the pit 12 is fixed The magnetic iron core 5, the non-magnetic lamination body 1 near the end of the rotor fixes the non-magnetic end plate A4, the non-magnetic lamination body 1 and the armature plate 6 are fixed together by the non-magnetic core rivet 3, the non-magnetic core rivet 3 Through the through hole 11 of the non-magnetic lamination body 1 , the non-magnetic end plate B7 is fixed between the non-magnetic lamination body 1 and the armature disk 6 , and the magnetic core 5 is in contact with the armature disk 6 .

The armature disc 6 and the friction disc A9 are fixed together, and the right side of the friction disc A9 is provided with a friction disc B (not shown in Figure 1 ), and the contact surface between the friction disc A9 and the friction disc B is the braking surface 10 .

The hollow part of the magnetic core 5 is provided with a compression spring 2 .

For wear resistance, the braking surface 10 is made of composite friction material.

For firmness, the armature disc 6 and the friction disc A9 are fixed together by a plurality of fastening screws 8 .

Its working principle is:

Processing: the axial flux brake adopts a split assembly structure, the rotor non-magnetic punching sheet is made of 304 stainless steel plate punched out and then laminated, the axial flux core is completed by casting or machining, and the groove of the armature disc Finished by milling.

When installing, as shown in Figure 1, fix the friction disc B on the motor stator 51 or the motor casing, so that the rotating shaft of the motor moves from the hollow part of the magnetic iron core 5 (or non-magnetic lamination 1), the compression spring 2, the armature The hollow inside the disk 6 passes through.

The axial magnetic flux brake is installed on the motor rotor as a separate part, the inner hole is installed on the rotating shaft, the shaft shoulder bears against the end face of the brake to prevent axial movement, and the radial positioning of the brake is realized through the flat key; the armature plate is through the spline Connected with the rotating shaft, through its axial movement on the rotating shaft, the suction and release of the brake can be realized.

Specifically: after installation, under the push of the compression spring 2, the non-magnetic laminated body 1, the magnetic iron core 5, the armature disc 6, and the friction disc A9 move to the right as a whole, and the friction disc A9 contacts with the friction disc B. In the braking state, the friction disc A9 decelerates due to the friction disc B, and because of the key connection, the motor shaft (including the motor rotor) also decelerates.

When the motor is energized, see Figure 2-3, the motor rotor 50 starts to rotate under the electromagnetic action. Because of the key connection, the magnetic iron core 5 and the non-magnetic laminated body 1, the armature disc 6, and the friction disc A9 are completely connected to the motor. The rotor 50 (also the shaft) rotates.

At the same time, referring to Fig. 2-4, because the rotor yoke and both ends are not magnetically conductive, at this time, the original radial magnetic flux at the motor stator extension 511 turns to the position close to the rotor and enters the armature disk 6, so that The armature disk 6 becomes a part of the magnetic circuit of the motor rotor, and the radial flux J (the two radial fluxes J in Figure 2 should overlap together, for the convenience of the view, it is drawn as two lines) becomes Axial magnetic flux Z. At this time, under the magnetic force of the axial magnetic flux Z, the magnetic core 5, the non-magnetic laminated body 1, the armature disc 6, and the friction disc A9 move to the left as a whole, and the friction disc A9 and the friction disc B are gradually separated, and the spring is compressed 2 is compressed shorter, the brake is released, the friction disc B no longer affects the motor shaft (including the motor rotor), and the motor works normally.

When the motor is powered off, the magnetic effect of the axial flux Z disappears, and under the push of the compression spring 2, the magnetic iron core 5, the non-magnetic lamination body 1, the armature disk 6, and the friction disk A9 move to the right as a whole, and the friction Disc A9 is in contact with friction disc B, and the brake is in the braking state again. As mentioned above, the motor shaft (including the motor rotor) gradually decelerates.

See Figure 2, the left part of Figure 2 (Figure 3 is the left view of this part) is a schematic diagram of the magnetic flux generated by the motor coil, this part of the magnetic flux is on a plane perpendicular to the axis of the motor shaft, and this part of the magnetic flux drives the motor normal work.

See Figure 2, the right part of Figure 2 (Figure 4 is the left view of this part) is a schematic diagram of the magnetic flux generated by the motor coil, the magnetic flux is L-shaped as a whole, and a part of it (refer to the reference symbol J) is distributed between the motor and the motor. On the plane perpendicular to the axial direction of the rotating shaft, the other part (refer to the reference sign Z, this specification is called the axial magnetic flux) is distributed on the plane parallel to the axial direction of the motor rotating shaft, and the axial magnetic flux is along the axial direction of the motor rotating shaft The distribution is just in line with the direction of the friction disc of the brake (that is, the friction disc A9 above), so that the axial magnetic flux can be beneficial to control the position of the friction disc A9, so that one coil can be reduced (that is, the exciting coil in the background technology).

Features of the present invention:

S1. The task of the present invention is to get rid of the drawbacks of the electric wire rope hoist using electromagnetic brakes, and to invent a brake integrated with the drive motor of the electric wire rope hoist, so that the brake and the motor are integrated, reducing the volume of the motor and the axial length of the motor , reduce the failure links, and achieve the goal of safe and reliable braking.

S2. In the present invention, the radial magnetic flux of the motor is converted into the axial magnetic flux, so that the brake armature plate is used as a part of the magnetic circuit of the motor, which can be used as a brake and can also increase the torque for the motor shaft. The working principle is that the motor is energized and the brake is engaged; the motor is powered off and the brake is released to realize the safe braking of the motor.

For other content, refer to the prior art.

What is described above is only the preferred embodiment of the present invention. It should be pointed out that for those skilled in the art, some changes and improvements can be made without departing from the overall concept of the present invention, and these should also be regarded as the present invention. protection scope of the invention.

Claims (4)

1. A motor axial flux brake, characterized in that: its inside is hollow, the rotating shaft of the motor passes through the hollow part of the motor axial flux brake, and the shaft between the motor axial flux brake and the motor The axial flux brake of the motor includes a non-magnetic lamination (1). The non-magnetic lamination (1) is connected to the rotating shaft of the motor by a spline. The non-magnetic lamination (1) There is a pit (12) on the outside, and the magnetic iron core (5) is fixed in the pit (12), and the non-magnetic end plate A (4) is fixed on the end of the non-magnetic lamination (1) close to the rotor, and the non-magnetic lamination The body (1) and the armature plate (6) are fixed together by a non-magnetic core rivet (3), and the non-magnetic core rivet (3) passes through the through hole (11) of the non-magnetic laminated body (1), The non-magnetic end plate B (7) is fixed between the non-magnetic laminated body (1) and the armature plate (6), the magnetic iron core (5) is in contact with the armature plate (6), and the armature plate (6) is in contact with the friction plate A (9) Fixed together, the right side of the friction disc A (9) is provided with the friction disc B, the contact surface of the friction disc A (9) and the friction disc B is the braking surface (10), the magnetic iron core (5) The hollow part is provided with a compression spring (2). 2. The motor axial flux brake according to claim 1, characterized in that: the braking surface (10) is made of composite friction material. 3. The motor axial flux brake according to claim 2, characterized in that: the armature disc (6) and the friction disc A (9) are fixed together by a plurality of fastening screws (8). 4. A motor, comprising a ring-shaped motor stator (51), a motor rotor (50) made of cast aluminum pierced inside the motor stator (51), and the right end of the motor stator (51) extending outward to form a motor The stator extension part (511), is characterized in that: the motor stator extension part (511) is pierced with a motor axial flux brake according to claim 3, and the axial flux brake of the motor and the rotating shaft of the motor are passed through a flat Keyed connection, motor axial flux brake, magnetic iron core (5) and the rotating shaft of the motor are connected by splines, and the friction disc B is fixed on the motor stator (51) or the motor casing.