DIRECT DRIVE TRANSMISSION SYSTEM

The disclosure provides a direct drive transmission system. The direct drive transmission system includes a mover unit and a stator unit driving the mover unit to move. The stator unit includes a stator assembly, two first end covers, and two first guide rails. The mover unit includes a mover assembly, two second end covers, and two second guide rails. The direct drive transmission system further includes a limiting structure. An end of the limiting structure close to each of the second end covers is located between the two second end covers. The stator assembly drives the mover assembly to cause the second guide rail to move along the first guide rail, such that the second end cover contacts a side wall of the limiting structure to realize limiting.

TECHNICAL FIELD

The disclosure relates to the technical field of transmission systems, and in particular, to a direct drive transmission system.

BACKGROUND

With the development of a direct drive transmission system technology, a direct drive transmission system has been widely used in various direct drive motors.

The direct drive transmission system in the related art includes a plurality of stators and a plurality of movers. The stators drive the movers to move to form a linear drive effect. In an existing direct drive transmission system, for left and right stroke limiting of the direct drive motor, hard limiting is realized generally by contacting an end cover of a base with a limiting structure on an end cover of a slide.

However, in some compact motor structures in the related art, the end cover of the base and the end cover of the slide are zigzag staggered from each other, which makes the end cover of the slide and the end cover of the base relatively complicated. Moreover, in order to have a compact structure, it is easy to cause a small limiting contact area and poor reliability.

Therefore, there is a need to provide a new direct drive transmission system to solve the above problems.

SUMMARY

The technical problem to be solved in the disclosure is to provide a direct drive transmission system that is easy to assemble and has a large limiting area and high reliability.

In order to solve the above technical problem, the disclosure provides a direct drive transmission system, wherein the direct drive transmission system includes a mover unit and a stator unit driving the mover unit to move; the stator unit includes a stator assembly, two first end covers fixed to two opposite circumferential sides of the stator assembly, and two first guide rails fixed to a side of the stator assembly close to the mover unit and extending along a motion direction of the mover unit, the two first guide rails are spaced apart in parallel; the mover unit includes a mover assembly, two second end covers fixed to two opposite circumferential sides of the mover assembly, and two second guide rails fixed to a side of the mover assembly close to the stator unit and extending along the motion direction of the mover unit, the two second guide rails are arranged are spaced apart in parallel; the two second end covers are respectively arranged directly opposite to and apart from the two first end covers, the two second guide rails respectively abutting against the two first guide rails to form a slidable connection; wherein a spaced surfaces of the two first end covers and the two second end covers close to each other have an orthographic plane structure; and the direct drive transmission system further includes a limiting structure fixed to a side of the stator assembly close to the mover assembly, an end of the limiting structure close to the two second end covers is located between the two second end covers, and the stator assembly drives the mover assembly to cause each second guide rail of the two second guide rails to move along a corresponding first guide rail of the two first guide rails, such that the each second end cover of the two second end covers contacts a side wall of the limiting structure to realize limiting.

As an improvement, each first end cover of the two first end covers and the second end cover have rectangular structures, and the end faces of the first end cover and the second end cover close to each other have linear structures.

As an improvement, the limiting structure has a rectangular structure.

As an improvement, the stator assembly includes a slide fixed to a side of the first guide rail away from the mover unit and a first drive unit fixed to a side of the slide close to the mover unit; and the mover assembly includes a base fixed to a side of the second guide rail away from the stator unit and a second drive unit fixed to a side of the base close to the first drive unit, the second drive unit is arranged directly opposite to and apart from the first drive unit; and the first drive unit and the second drive unit generate mutual thrust to drive the second guide rail of the base to move linearly along the first guide rail of the slide.

As an improvement, the stator assembly further includes a first position feedback device fixed to a side of the slide close to the mover unit, and the mover assembly further includes a second position feedback device fixed to a side of the base close to the stator unit, the second position feedback device is arranged directly opposite to and apart from the first position feedback device and configured to read a position of the mover assembly relative to the stator assembly.

As an improvement, the first drive unit includes iron cores fixed to the slide and arranged along a length direction of the first guide rail and drive coils respectively wound around each of the iron cores; and the second drive unit includes a yoke fixed to the base and a plurality of permanent magnets fixed to a side of the yoke close to the drive coils, each of the permanent magnets is spaced apart from and directly opposite to one of the drive coils.

As an improvement, the first position feedback device is a linear encoder read head; and the second position feedback device is a linear encoder, the linear encoder is arranged apart from and directly opposite to the linear encoder read head.

Compared with the related art, in the direct drive transmission system of the disclosure, the stator unit drives the mover unit to realize linear motion. The two second guide rails of the mover unit respectively abut against the two first guide rails of the stator unit to form a slidable connection. A spaced surface of the first end cover of the stator unit and the second end cover of the mover unit has an orthographic plane structure. The direct drive transmission system further includes a limiting structure fixed to a side of the stator assembly close to the mover assembly, an end of the limiting structure close to each of the second end covers is located between the two second end covers, and the stator assembly drives the mover assembly to cause the second guide rails to move along the first guide rail, such that the second end cover contacts a side wall of the limiting structure to realize limiting. In this way, the spaced surface of the first end cover and the second end cover is a plane, such that the structure is simple, and manufacturing costs are low. At the same time, one end of the limiting structure is fixed to the mover assembly, and the other end of the limiting structure is arranged close to the second end cover, such that a contact area between the side wall of the limiting structure and the second end cover is large, a limit effecting is good, and reliability of the direct drive motor is further improved.

DESCRIPTION OF EMBODIMENTS

The technical solutions in the embodiments of the disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the disclosure. Obviously, the described embodiments are only part of instead of all of the embodiments of the disclosure. Based on the embodiments in the disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the disclosure.

Referring toFIG.1toFIG.4, a direct drive transmission system100is provided. The direct drive transmission system100includes a mover unit2and a stator unit1driving the mover unit2to move.

The stator unit1includes a stator assembly11, two first end covers12fixed to two opposite circumferential sides of the stator assembly11, and two first guide rails13fixed to a side of the stator assembly11close to the mover unit2and extending along a motion direction of the mover unit2. The two first guide rails13are spaced apart in parallel.

The mover unit2includes a mover assembly21, two second end covers22fixed to two opposite circumferential sides of the mover assembly21, and two second guide rails23fixed to a side of the mover assembly21close to the stator unit1and extending along the motion direction of the mover unit2. The two second guide rails23are spaced apart in parallel. The two second end covers22are respectively arranged directly opposite to and apart from the two first end covers12, and the two second guide rails23respectively abut against the two first guide rails13to form a slidable connection, which facilitates the mover unit2to move linearly on the stator unit1. A spaced surface of the first end cover12and the second end cover22has an orthographic plane structure. The spaced surface of the first end cover12and the second end cover22is plane, such that the structure is simple, and manufacturing costs are low.

A primary magnetic field is generated by the stator assembly11, the stator assembly11and the mover assembly21are directly opposite to each other, and thrust generated between the stator assembly11and the mover assembly21is used to drive the second guide rail23of the mover unit2to move linearly along the first guide rail13of the stator unit1.

As an improvement, a plurality of stator units1may be provided, and a plurality of mover units2may also be provided. The plurality of stator units1and the plurality of mover units2are arranged directly opposite and apart. The plurality of mover units2are driven by the plurality of stator units1to realize circular linear motion. The motion direction of the mover unit2can be controlled by adjusting a driving direction of a magnetic field of the stator unit1.

The direct drive transmission system100further includes a limiting structure3fixed to a side of the stator assembly11close to the mover assembly21, an end of the limiting structure3close to the second end cover22is located between the two second end covers22, and the stator assembly11drives the mover assembly21to cause the second guide rail23to move along the first guide rail13, such that the second end cover22contacts a side wall of the limiting structure3to realize limiting. In this way, the spaced surface of the first end cover12and the second end cover22is a plane, such that the structure is simple, and manufacturing costs are low. At the same time, one end of the limiting structure3is fixed to the mover assembly21, and the other end of the limiting structure3is arranged close to the second end cover22, such that a contact area between the side wall of the limiting structure3and the second end cover22is large, a limit effecting is good, and reliability of the direct drive motor is further improved.

In this embodiment, both the first end cover12and the second end cover22have rectangular structures, and end faces of the first end cover12and the second end cover22close to each other have linear structures. Therefore, the first end cover12and the second end cover22have simple structures and low manufacturing costs.

In this embodiment, the limiting structure3has a rectangular structure. It is convenient to mount and fix one end of the limiting structure3to the mover assembly21and cause the other end of the limiting structure3to correspond to the stator assembly11, and a side surface between the side wall of the limiting structure3and the two first end covers12form a limiting contact, so as to realize a larger area of hard limiting, thereby improving the reliability of the direct drive motor.

The larger the contact area between the limiting structure3and the first end cover12, the higher the reliability of the direct drive motor.

In this embodiment, the stator assembly11includes a slide111fixed to a side of the first guide rail13away from the mover unit2and a first drive unit112fixed to a side of the slide111close to the mover unit2. The mover assembly21includes a base211fixed to a side of the second guide rail23away from the stator unit1and a second drive unit212fixed to a side of the base211close to the first drive unit112. The second drive unit212is arranged directly opposite to and apart from the first drive unit112. The first drive unit112and the second drive unit212generate mutual thrust to drive the second guide rail23of the base211to move linearly along the first guide rail13of the slide111. Driving thrust is generated between the first drive unit112and the second drive unit212, such that the base211fixed to the second drive unit212can move linearly under the action of the thrust. Certainly, when the base211is fixed, the slide111is correspondingly arranged on the base211, and driving thrust is generated between the first drive unit112and the second drive unit212, such that the slide111fixed to the first drive unit112can move linearly under the action of the thrust.

In this embodiment, the stator assembly11further includes a first position feedback device113fixed to a side of the slide111close to the mover unit2, and the mover assembly21further includes a second position feedback device213fixed to a side of the base211close to the stator unit1. The second position feedback device213is arranged directly opposite to and apart from the first position feedback device113and configured to read a position of the mover assembly21relative to the stator assembly11. Through position information collection between the first position feedback device113and the second position feedback device213, the mover assembly21can be positioned, and positioning accuracy is high.

In this embodiment, the first drive unit112includes a plurality of iron cores1121fixed to the slide111and arranged along a length direction of the first guide rail13and drive coils1122respectively wound around each of the iron cores1121. When the drive coils1122generate current, the drive coils1122are activated to generate a traveling wave magnetic field to drive the second drive unit212to move. The drive coils1122are fixed in the iron cores1121to increase the magnetic field of the drive coils1122, so as to better drive the second drive unit212to move linearly.

As an improvement, the drive coils1122are arranged side by side and evenly apart on a side of the iron core1121close to the second drive unit212, so the magnetic field is uniform and a driving effect is good.

The second drive unit212includes a yoke2121fixed to the base211and a plurality of permanent magnets2122fixed to a side of the yoke2121close to the drive coils1122. Each of the permanent magnets2122is spaced apart from and directly opposite to one of the drive coils1122. The plurality of permanent magnets2122are fixed to one side of the yoke2121, and the other side of the yoke2121is fixed to the base211, such that a magnetic field force is always generated by the plurality of permanent magnets2122. When an appropriate current is applied to the drive coil1122, the drive coil1122generates a primary traveling wave magnetic field, the permanent magnet2122generates a secondary magnetic field, and thrust is generated between the drive coil1122and the permanent magnet2122to drive the base211to move linearly on the slide111.

As an improvement, the plurality of permanent magnets2122are arranged side by side and fixed apart to the yoke2121.

In this embodiment, the first position feedback device113is a linear encoder read head. The second position feedback device213is a linear encoder. The linear encoder is arranged apart from and directly opposite to the linear encoder read head. The linear encoder read head is configured to identify position information fed back by the linear encoder, so as to facilitate real-time positioning of the mover unit2.

The linear encoder is an incremental linear encoder. A measurement principle of the linear encoder involves modulating light into Moire fringes through two gratings moving relative to each other, obtaining a displacement variation by counting and subdividing the Moire fringes, and setting one or more reference points on a ruler grating to determine positions.

As an improvement, the linear encoder is mounted on the mover unit2, and the linear encoder has high feedback position accuracy. The linear encoder is arranged directly opposite to the reading head, such that the reading head can identify information of the linear encoder in real time, bringing high read and write identification efficiency and a good positioning effect.

As an improvement, the linear encoder is mounted on the base211, the reading head is mounted on the slide111, and the linear encoder is arranged directly opposite to the linear encoder read head to read position information of the mover unit2in real time, so as to facilitate the real-time positioning of the mover unit2.

As an improvement, the linear encoder is an optical grating or a magnetic grating. The optical grating or magnetic grating has low costs. The linear encoder is not limited to the optical grating or magnetic grating.

Compared with the related art, in the direct drive transmission system of the disclosure, the stator unit drives the mover unit to realize linear motion. The two second guide rails of the mover unit respectively abut against the two first guide rails of the stator unit to form a slidable connection. A spaced surface of the first end cover of the stator unit and the second end cover of the mover unit has an orthographic plane structure. The direct drive transmission system further includes a limiting structure fixed to a side of the stator assembly close to the mover assembly, an end of the limiting structure close to each of the second end covers is located between the two second end covers, and the stator assembly drives the mover assembly to cause the second guide rails to move on the first guide rail, such that the second end cover contacts a side wall of the limiting structure to realize limiting. In this way, the spaced surface of the first end cover and the second end cover is a plane, such that the structure is simple, and manufacturing costs are low. At the same time, one end of the limiting structure is fixed to the mover assembly, and the other end of the limiting structure is arranged close to the second end cover, such that a contact area between the side wall of the limiting structure and the second end cover is large, a limit effecting is good, and reliability of the direct drive motor is further improved.

The above descriptions are only embodiments of the disclosure. It should be pointed out herein that, for those of ordinary skill in the art, improvements can also be made without departing from the creative concept of the disclosure, all of which fall within the protection scope of the disclosure.