WO2017175999A1

WO2017175999A1 - Motor with multi-axis of rotation

Info

Publication number: WO2017175999A1
Application number: PCT/KR2017/003248
Authority: WO
Inventors: Seok Ki JI; Won Rok Song
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-04-04
Filing date: 2017-03-27
Publication date: 2017-10-12
Anticipated expiration: 2018-10-04
Also published as: KR101789597B1; KR20170114090A

Abstract

Disclosed herein is a multi-shaft drive motor. The multi-shaft drive motor includes: a caterpillar-type rotary belt facing a magnetic field forming core unit disposed on an inner surface of a case; a facing magnet unit disposed on an outer surface of the rotary belt to perform magnetic interaction with the magnetic field forming core unit; and a plurality of rotating shafts disposed on an inner surface of the rotary belt to adjoin the rotary belt to be rotated by rotation of the rotary belt. The multi-shaft drive motor according to the present invention can improve space utilization efficiency in a narrow space such as the inside of an electric vehicle while preventing shaking of a vehicle or uneven wear of a tire due to simultaneous use of multiple motors (for front and rear wheels) upon driving at high speed.

Description

MOTOR WITH MULTI-AXIS OF ROTATION

The present invention relates to a multi-shaft drive motor, and more particularly to a multi-shaft drive motor which can improve space utilization efficiency in a narrow space, such as the interior of an electric vehicle, while preventing shaking of a vehicle or uneven wear of a tire due to simultaneous use of multiple motors (for front and rear wheels) upon driving at high speed.

A motor is also called an electric motor and converts electrical energy into mechanical energy by means of force exerted on a current-carrying conductor placed in a magnetic field.

Particularly, a motor is widely used to rotationally drive various devices. As shown in Fig. 12, such a motor is composed of a stator 20 securely mounted in a housing 10 and a rotor 30 passing through the center of the stator 20 and provided with a rotating shaft 31 to transmit torque of the rotor to the outside.

As shown in the drawing, in the motor as set forth above, the rotating shaft is rotatably mounted in the housing by a bearing 40. When rotated by operation of the rotor, the rotatably mounted rotating shaft can be smoothly rotated without shaking laterally due to the action of the bearing.

Here, the motor is subjected to load in a perpendicular direction with respect to the ground.

That is, when the rotating shaft of the motor is disposed in a direction parallel to the ground, an outer surface of the rotor is brought into contact with and rubs against an inner surface of the stator, thereby causing reduction in operation efficiency. Further, the large volume of the motor makes it difficult to install the motor in a device having a narrow design space, such as an electric automobile or an electric scooter.

As a technique for reducing frictional force at a contact portion between the rotor and the inner surface of the stator, Korean Patent Publication No. 2010-50834 discloses a motor (see Fig. 13) that includes a cylindrical stator 20 securely mounted in a housing 10 and a rotor 30 passing through the center of the stator 20 and connected to a rotating shaft, wherein the motor further includes magnets 311 disposed at both ends thereof and rotating together with the rotor and a stationary magnet disposed in the housing to face the magnets 311 and allowing the rotor 30 to be held floating in the housing through mutual repulsion with the magnets 311 such that the rotor can be supported in a non-contact manner, thereby reducing friction loss due to contact while increasing operation efficiency. However, there is still a problem that the motor takes up a large volume.

It is one object of the present invention to provide a multi-shaft drive motor which can improve space utilization efficiency in a narrow space, such as the inside of an electric vehicle, while preventing shaking of a vehicle or uneven wear of a tire due to simultaneous use of multiple motors (for front and rear wheels) upon driving at high speed.

In accordance with one aspect of the present invention, there is provided a multi-shaft drive motor including: a caterpillar-type rotary belt facing a magnetic field forming core unit disposed on an inner surface of a case; a facing magnet unit disposed on an outer surface of the rotary belt and performing magnetic interaction with the magnetic field forming core unit; and a plurality of rotating shafts disposed on an inner surface of the rotary belt to be rotated by rotation of the rotary belt.

The rotating shaft may include mating teeth engaged with gear teeth formed on the inner surface of the rotary belt to be geared with the rotary belt to be rotated by rotation of the rotary belt.

The case may include a case body formed along a rotating surface of the rotary belt and a cover having a rotating hole through which the rotating shaft passes.

The magnetic field forming core unit may include a core and a coil wound around the core.

The rotating shaft may be a bar member secured to the center of a mating disk adjoining the inner surface of the rotary belt.

The mating disk may have mating teeth engaged with the gear teeth.

The facing magnet unit may include a magnet securing portion securing the facing magnet unit to the rotary belt and a magnet.

The facing magnet unit may include a permanent magnet or an electromagnet.

The multi-shaft drive motor may further include a dummy disk disposed in a section of the rotary belt connected to the rotating shaft to adjoin the inner surface of the rotary belt to be rotated by rotation of the rotary belt.

The dummy disk may include separate mating teeth engaged with the gear teeth.

The multi-shaft drive motor may further include a rotating unit adjoining the outer surface of the rotary belt to prevent sagging or lifting of the rotary belt.

The rotating unit may be formed of a magnetic material.

According to the present invention, it is possible to provide a multi-shaft drive motor which can improve space utilization efficiency in a narrow space, such as the inside of an electric vehicle, while preventing shaking of a vehicle or uneven wear of a tire due to simultaneous use of multiple motors (for front and rear wheels) upon driving at high speed.

Fig. 1 is a perspective view of a motor according to the present invention;

Fig. 2 is an exploded perspective view of the motor according to the present invention;

Fig. 3 is a perspective view of a rotating shaft, disk, and rotary belt of the motor of Fig. 2 and an enlarged view of a facing magnet unit;

Fig. 4 is a cross-sectional view taken along line V-V of Fig. 1;

Fig. 5 is an enlarged view of portion VI of Fig. 4;

Fig. 6 is a cross-sectional view taken along line VII-VII in Fig. 4;

Fig. 7 is a perspective view of the interior of the motor with a rotating unit;

Fig. 8 is a side view of the rotary belt with a dummy disk and an enlarged view of the rotating unit;

Fig. 9 is a cross-sectional view taken along line X-X of FIG. 8, mainly showing the facing magnet unit and the rotating unit;

Fig. 10 is a cross-sectional view of another embodiment taken along line X-X of Fig. 8, mainly showing the facing magnet unit and the rotating unit;

Fig. 11 is a conceptual view of the motor according to the present invention incorporated in a rear-wheel drive electric vehicle, wherein an augmenting belt is provided for higher power output;

Fig. 12 is a sectional view of a typical cylindrical motor; and

Fig. 13 is a sectional view of another typical cylindrical motor.

Hereinafter, embodiments of the present invention will be described in detail.

The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. Unless otherwise defined herein, all terms including technical or scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. As used herein, the singular forms, "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. In addition, it will be understood that the terms "includes", "comprises", "including" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups. Descriptions of known functions and constructions which may unnecessarily obscure the subject matter of the present invention will be omitted.

Fig. 1 is a perspective view of a motor according to the present invention; Fig. 2 is an exploded perspective view of the motor according to the present invention; Fig. 3 is a perspective view of a rotating shaft, disk, and rotary belt of the motor of Fig. 2 and an enlarged view of a facing magnet unit; Fig. 4 is a cross-sectional view taken along line V-V of Fig. 1; Fig. 5 is an enlarged view of portion VI of Fig. 4; Fig. 6 is a cross-sectional view taken along line VII-VII in Fig. 4; Fig. 7 is a perspective view of the interior of the motor with a rotating unit; Fig. 8 is a side view of the rotary belt with a dummy disk and an enlarged view of the rotating unit; Fig. 9 is a cross-sectional view taken along line X-X of FIG. 8, mainly showing the facing magnet unit and the rotating unit; Fig. 10 is a cross-sectional view of another embodiment taken along line X-X of Fig. 8, mainly showing the facing magnet unit and the rotating unit; and Fig. 11 is a conceptual view of the motor according to the present invention incorporated in a rear-wheel drive electric vehicle, wherein an augmenting belt is provided for higher power output.

A multi-shaft drive motor 1000 according to the present invention includes a caterpillar-type rotary belt 200 facing a magnetic field forming core unit 110 disposed on an inner surface of the case 100, a facing magnet unit 300 disposed on an outer surface of the rotary belt to perform magnetic interaction with the magnetic field forming core unit 110, and a plurality of rotating shafts 400 disposed on an inner surface of the rotary belt to adjoin the rotary belt 200 to be rotated by rotation of the rotary belt.

The case 100 is a housing which contains the rotary belt 200 and the facing magnet unit 300 disposed on the outer surface of the rotary belt 200 and supports transmission of torque generated by rotation of the rotating shaft 400 to an end 400' of the rotating shaft exposed outside the case.

In addition, the case 100 may include a case body 120 formed along a rotating surface of the rotary belt to facilitate installation or removal of the rotary belt for assembly or repair, and a cover 130 having a rotating hole 132 through which the rotating shaft 400 passes to support the rotating shaft. Here, the rotating hole may be provided with a friction reducing member 134 such as a rolling bearing, a sliding bearing or a ball bearing to allow smooth rotation of the rotating shaft.

The magnetic field forming core unit 110 disposed on the inner surface of the case 100 forms a magnetic field in conjunction with the facing magnet unit 300 facing the magnetic field forming core unit 110 to rotate the rotary belt 200. The magnetic field forming core unit 110 includes a core 112, which is formed by stacking silicon steel plates, drawn steel plates, forged steel plates, or phosphorus-containing copper alloy plates and non-conductors for electrical insulation, such as mica, in an alternating manner, and a coil 114 wound around the core 112 so as to form a magnetic field when electric current is applied thereto.

The magnetic field forming core unit 110 may be coupled to the case 100 by a bolt b passing through a fastening hole 122 formed through the case body 120. Thus, the magnetic field forming core unit 110 can be easily replaced during assembly or repair, thereby saving time while reducing costs.

The caterpillar-type rotary belt 200 is rotated through magnetic interaction of the facing magnet unit 300 with the magnetic field forming core unit 110 of the case body 120, which is formed along the rotating surface of the rotary belt to face the rotary belt. The caterpillar-type rotary belt may be formed of durable polymers, rubbers or metals. The rotary belt contacts and rubs against the rotating shaft such that torque generated by a magnetic force of the rotary belt can be transmitted to the rotating shaft.

For high-speed rotation of the rotating shaft 400 or precise control of rotation of the rotating shaft, the rotating shaft 400 may include mating teeth g2 engaged with gear teeth g1 formed on the inner surface of the rotary belt 200 to be geared with the rotary belt 200 to be rotated by rotation of the rotary belt.

Thus, the gear teeth g1 are arranged at regular pitches on the inner surface of the rotary belt 200, that is, on the surface of the rotary belt 200 facing the rotating shaft 400 to rotate the rotating shaft 400 including the mating teeth g2 arranged at the same pitches to be engaged with the gear teeth.

The rotating shaft 400 may be a bar member secured to the center of a mating disk 410 formed with the mating teeth g2. Since it is easier to increase or decrease the diameter of the mating disk than to increase or decrease the diameter of the rotating shaft 400 in order to obtain a desired torque output, it is desirable that the mating disk be used.

As described above, the rotary belt 200 is provided on the outer surface thereof with the facing magnet unit 300 to perform magnetic interaction with the magnetic field forming core unit 110. The facing magnet unit 300 may include a magnet securing portion 310, which secures the facing magnet unit 300 to the rotary belt 200, and a magnet 320 inserted into a central groove 312 of the magnet securing portion 310.

The magnet securing portion 310 may be bolted to a magnet hole (not shown) perforated in the rotary belt 200, or may include a clip or a clamp foot (not shown) to grasp transverse edges of the rotary belt 200. Here, the magnet hole or the clamp foot is preferably formed at transverse ends of the rotary belt 200 not adjoining the mating teeth g2. In addition, the magnet securing portion 310 may be formed with the central groove 312 in which the magnet 320 is inserted and seated.

Although the magnet 320 may be a permanent magnet capable of performing magnetic interaction with the magnetic field forming core unit 110, it should be understood that the margent may also be an electromagnet. When an armature core is used as the magnet 320, the magnet securing portion 310 may be provided with an armature winding coil (not shown).

The coil 114 of the magnetic field forming core unit 110 or the armature winding coil may be wound by any suitable method known in the art, and electric current applied to the coils may be regulated and supplied by an external power supply or a controller (not shown) to rotate the rotary belt 200.

When the rotary belt 200 is intended to drive multiple shafts, particularly two shafts, sagging or lifting can occur in a section of the rotary belt connected to the rotating shaft 400. In this case, magnetic field loss occurs due to a difference in the distance between the magnetic field forming core unit 110 and the facing magnet unit 300 performing magnetic interaction with the magnetic field forming core unit 110. In order to prevent this problem, a dummy disk may be separately disposed in a section of the rotary belt 200 connected to the rotating shaft 400. Particularly, the dummy disk 420 may be provided with separate mating teeth g2 for gear engagement. Here, the dummy disk 420 refers to a device that is rotated by rotation of the rotary belt, but does not transmit torque to the outside.

In addition to or as an alternative to the dummy disk, the rotary belt 200 may include a rotating unit 500 to prevent sagging or lifting in a section of the rotary belt 200 connected to the rotational shaft 400.

When the rotary belt 200 is intended to drive multiple shafts, for example, two shafts, ends 400' of adjacent rotating shafts may be connected to one another through a reinforcing belt 600 to increase torque transmitted to the outside. The end of the rotating shaft engaged with the reinforcing belt 600 may be formed of typical polymers, rubbers, or metals. Alternatively, the ends 400' of the rotating shafts not engaged with the reinforcing belt may be connected to one another through frictional engagement or gear engagement between respective shaft disks (not shown).

The rotating unit 500 may include: a rotating roller or rotating ball 510 adjoining the rotary belt or the facing magnet unit and rotating within a rotating housing 520; and a rotating support 530 for the rotating housing which is secured at one end thereof to one surface of the rotating housing and secured at the other end thereof to the inner surface of the case 100. The rotating unit 500 may also be disposed around a rotating disk 410 such that the rotary belt can be rotated in such a way that stable and accurate magnetic field interaction is achieved.

The rotating unit, the rotating roller, and the rotating ball may be formed of a magnetic material such that sagging or lifting of the rotary belt can be further prevented due to attraction of a magnetic field generated through interaction with the facing magnet unit.

1000: Multi-shaft drive motor 100: Case

110: Magnetic field forming core unit 200: Rotary belt

300: Facing magnet unit 400: Rotating shaft

500: Rotating unit 600: Reinforcing belt

Claims

A multi-shaft drive motor comprising:

a caterpillar-type rotary belt facing a magnetic field forming core unit disposed on an inner surface of a case;

a facing magnet unit disposed on an outer surface of the rotary belt to perform magnetic interaction with the magnetic field forming core unit; and

a plurality of rotating shafts disposed on an inner surface of the rotary belt to adjoin the rotary belt to be rotated by rotation of the rotary belt.
The multi-shaft drive motor according to claim 1, wherein the rotating shaft comprises mating teeth engaged with gear teeth formed on the inner surface of the rotary belt to be geared with the rotary belt to be rotated by rotation of the rotary belt.
The multi-shaft drive motor according to claim 1, wherein the case comprises a case body formed along a rotating surface of the rotary belt and a cover having a rotating hole through which the rotating shaft passes.
The multi-shaft drive motor according to claim 1, wherein the magnetic field forming core unit comprises a core and a coil wound around the core.
The multi-shaft drive motor according to claim 2, wherein the rotating shaft is a bar member secured to the center of a mating disk adjoining the inner surface of the rotary belt.
The multi-shaft drive motor according to claim 5, wherein the mating disk has mating teeth engaged with the gear teeth.
The multi-shaft drive motor according to claim 1, wherein the facing magnet unit comprises a magnet securing portion securing the facing magnet unit to the rotary belt, and a magnet.
The multi-shaft drive motor according to claim 1, wherein the facing magnet unit comprises a permanent magnet or an electromagnet.
The multi-shaft drive motor according to claim 1, further comprising:

a dummy disk disposed in a section of the rotary belt connected to the rotating shaft to adjoin the inner surface of the rotary belt to be rotated by rotation of the rotary belt.
The multi-shaft drive motor according to claim 9, wherein the dummy disk comprises separate mating teeth engaged with the gear teeth.
The multi-shaft drive motor according to claim 1, further comprising:

a rotating unit adjoining the outer surface of the rotary belt to prevent sagging or lifting of the rotary belt.
The multi-shaft drive motor according to claim 11, wherein the rotating unit is formed of a magnetic material.