CN220122726U - Tubular motor - Google Patents

Abstract

The utility model discloses a tubular motor, which comprises a motor, wherein the motor comprises a rotor, a stator arranged outside the rotor and a shell arranged outside the stator, and the stator comprises a first magnet; a second magnet is arranged outside the shell. Compared with the prior art, the utility model has the advantages that: through addding the second magnet, can produce the magnetic field, can increase the appeal to the rotor when the rotor is not on the basis of the magnetic field of first magnet, improve the stall resistance that the rotor received after outage to promote the braking performance of motor.

Description

Tubular motor

Technical Field

The utility model relates to a power device, in particular to a tubular motor.

Background

The tubular motor is often used for occasions such as electric curtains, ceiling curtains and the like, and can be used as a power source for driving the curtains to automatically open and close. The tubular motor generally includes a motor, a reduction gearbox, a control circuit board, and the like. The motor usually adopts a brush motor, and an existing brush motor, such as a permanent magnet direct current brush motor disclosed in China patent with the application number of 200720056699.9, comprises a stator, a rotor, an electric brush and a commutator, wherein the stator is provided with a permanent magnet, and the rotor is provided with a rotor winding.

After the brush motor is powered on by the rotor winding, a deflection force perpendicular to the direction of the magnetic field is generated under the action of the magnetic field of the permanent magnet, so that the rotor shaft is driven to rotate. When the rotor winding is not electrified, the rotor still rotates due to inertia, and the attractive force of the permanent magnet of the motor to the rotor weakens the rotation of the rotor until the rotor stops. However, the stopping resistance of the rotor is not large only by the magnetic field of the permanent magnet, so that the motor braking time is long, and the actual use requirement cannot be met.

Disclosure of Invention

The utility model aims to solve the technical problem of providing a tubular motor capable of improving braking performance aiming at the defects in the prior art.

The technical scheme adopted for solving the technical problems is as follows: a tubular motor comprising a motor, the motor comprising a rotor, a stator disposed outside the rotor, and a housing disposed outside the stator, the stator comprising a first magnet; the method is characterized in that:

a second magnet is arranged outside the shell.

Through addding the second magnet, can produce the magnetic field, can increase the appeal to the rotor when the rotor is not on the basis of the magnetic field of first magnet, improve the stall resistance that the rotor received after outage to promote the braking performance of motor.

Further, the second magnet has two oppositely disposed outside the housing, whereby the stall resistance can be further increased.

Preferably, the directions of the magnetic fields generated by the first magnet and the second magnet are perpendicular to each other. The magnetic field generated by the second magnet is perpendicular to the magnetic field generated by the first magnet, so that the magnetic field of the first magnet cannot be disturbed, and the influence on the whole operation of the motor is small.

Further, the tubular motor further includes an outer tube disposed outside the motor, the outer tube being hollow cylindrical, the housing having a flat plate portion such that a gap is formed between the outer tube and the flat plate portion, and the second magnet is disposed outside the flat plate portion and within the gap formed between the outer tube and the flat plate portion. Since there is typically a gap between the outer tube and the motor housing, the second magnet can be positioned to take full advantage of the gap without additional space.

Further, in order to facilitate the fixation of the second magnet, the housing is made of iron, and the second magnet is magnetically fixed with the housing.

Preferably, the first magnet is a permanent magnet, and the first magnet has two poles, one of which is an N pole and the other of which is an S pole.

Preferably, a groove for placing a rotor winding is formed in the rotor.

Preferably, the motor is a direct current brush motor.

Compared with the prior art, the utility model has the advantages that: by additionally arranging the second magnet, a magnetic field can be generated, so that the attractive force to the rotor can be increased on the basis of the magnetic field of the first magnet when the rotor is not electrified, the stalling resistance of the rotor after the rotor is powered off is improved, and the braking performance of the motor is improved; the magnetic field generated by the second magnet is perpendicular to the magnetic field generated by the first magnet, so that the magnetic field of the first magnet is not disturbed, and the influence on the whole operation of the motor is small; the shell and the second magnet are utilized for magnetic attraction and fixation, no additional fixing structure is needed, the structure is simple, and the cost is low.

Drawings

FIG. 1 is a schematic view of a tubular motor according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a hidden outer tube of a tubular motor according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of an electric motor and a second magnet according to an embodiment of the present utility model;

FIG. 4 is a cross-sectional view of a tubular motor according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram of the magnetic field generated by the first magnet of the tubular motor according to an embodiment of the present utility model;

FIG. 6 is a schematic diagram of the magnetic field generated by a second magnet of a tubular motor according to an embodiment of the present utility model;

fig. 7 is a schematic diagram of a tubular motor according to an embodiment of the present utility model after mixing two magnetic fields.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present utility model may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.

Referring to fig. 1 to 4, a tubular motor includes a motor 1, a reduction gear 2 and an outer tube 3, the reduction gear 2 is disposed at an output end of the motor 1, the output of the motor 1 is reduced and then output through an output shaft 4, and the outer tube 3 is disposed at outer circumferences of the motor 1 and the reduction gear 2.

The motor 1 is a direct current brush motor, and comprises a stator 11 and a rotor 12, and other structures are the same as those of the existing direct current brush motor. The stator 11 is disposed outside the rotor 12 and includes first magnets 111, in this embodiment, the first magnets 111 are permanent magnets having two, wherein the N pole of one first magnet 111 faces the S pole of the other first magnet 111 (i.e., the N pole of one first magnet 111 faces the rotor 12 and the S pole faces away from the rotor 12, and the S pole of the other first magnet 111 faces the rotor 12 and the N pole faces away from the rotor 12), thereby forming a magnetic field in a first direction from N to S, as shown in fig. 5, which is an existing stator 11 structure.

The rotor 12 has grooves 121 formed therein for receiving rotor windings (not shown) having at least two, and in this embodiment three, groups, spaced apart along the circumference of the rotor 12. The rotor 12 further includes a rotor shaft 122 for connecting to the reduction gear 2 to output torque.

The motor 1 further comprises a housing 13, the stator 11 is disposed in the housing 13, and the rotor shaft 122 extends from the housing 13 to the outside of the housing 13.

The outer tube 3 is hollow cylindrical, while the outer housing 13 is not strictly cylindrical, and has a flat plate portion 131, whereby a gap is formed between the outer tube 3 and the flat plate portion 131, and a second magnet 14 may be provided outside the flat plate portion 131 of the outer housing 13, the second magnet 14 being located in the gap. Preferably, the second magnet 14 may be a magnet. One of the poles of the second magnet 14 faces into the housing 13 and the other pole faces out of the housing 13, as shown in fig. 6, with the S pole facing inward and the N pole facing outward, resulting in a magnetic field as shown in fig. 6. The magnetic fields formed by the first magnet 111 and the second magnet 14, respectively, are mixed inside the housing 13 as shown in fig. 7, and the magnetic field formed by the second magnet 14 has a portion extending in the second direction, which is perpendicular to the first direction. The housing 13 is made of iron, so that the second magnet 14 can be magnetically fixed on the housing 13, no additional fixing structure is needed, the structure is simple, and the cost is low. The magnetic field generated by the second magnet 14 is perpendicular to the magnetic field generated by the first magnet 111 (the other non-perpendicular portions cancel each other out on both sides in the perpendicular direction, and thus can be considered as the magnetic field directions perpendicular to each other), and the magnetic field of the first magnet 111 is not disturbed, and the influence on the overall operation of the motor 1 is small.

After the rotor windings are energized with direct current, the rotor shaft 122 rotates under the influence of the stator magnetic field. When the rotor winding is not electrified, the inertial rotor 12 still rotates, and at the moment, the attractive force of the magnetic field generated by the first magnet 111 of the stator 11 on the rotor 12 weakens 12 the rotation of the rotor until the rotor stops, and in addition, the attractive force on the rotor 12 can be increased by the magnetic field in the second direction generated by the second magnet 14, so that the rotor 12 is subjected to larger stopping resistance, and the braking performance of the motor is improved.

In the above embodiment, the second magnet 14 is one, alternatively, a second magnet 14 may be further disposed outside the housing 13, where two second magnets 14 are symmetrically disposed with respect to the housing 13, opposite magnetic poles are disposed opposite to each other, and the manner of disposing the second magnets is the same as that of the first magnets 111, and the generated magnetic field is perpendicular to the direction of the first magnets 111. Therefore, the stalling resistance can be increased, and the braking performance is further improved.

Claims (8)

1. A tubular electric motor comprising an electric motor (1), the electric motor (1) comprising a rotor (12), a stator (11) arranged outside the rotor (12) and a housing (13) arranged outside the stator (11), the stator (11) comprising a first magnet (111); the method is characterized in that:

a second magnet (14) is arranged outside the shell (13).

2. The tubular motor of claim 1, wherein: the directions of magnetic fields generated by the first magnet (111) and the second magnet (14) are perpendicular to each other.

3. The tubular motor of claim 2, wherein: the second magnet (14) has two magnets arranged opposite each other outside the housing (13).

4. A tubular motor according to any one of claims 1 to 3, characterized in that: the tubular motor further comprises an outer tube (3) arranged outside the motor (1), the outer tube (3) is hollow and cylindrical, the outer shell (13) is provided with a flat plate portion (131), a gap is formed between the outer tube (3) and the flat plate portion (131), and the second magnet (14) is arranged outside the flat plate portion (131) and is located in the gap formed between the outer tube (3) and the flat plate portion (131).

5. The tubular motor of claim 4, wherein: the shell (13) is made of iron, and the second magnet (14) is magnetically fixed with the shell (13).

6. A tubular motor according to any one of claims 1 to 3, characterized in that: the first magnet (111) is a permanent magnet, and the first magnet (111) has two poles, one of which is an N pole and the other of which is an S pole.

7. A tubular motor according to any one of claims 1 to 3, characterized in that: a groove (121) for placing a rotor winding is formed in the rotor (12).

8. A tubular motor according to any one of claims 1 to 3, characterized in that: the motor (1) is a direct current brush motor.