Encoder rotor, encoder and motor

Abstract

The utility model discloses an encoder rotor, an encoder and a motor, the encoder rotor comprises a code disc support, a rigid transparent member and a metal code disc, a glass plate is provided with a first surface and a second surface, and the first surface is adhered to the code disc support; the metal code disc is adhered to the second surface; at least the second surface of the glass plate is a smooth plane. The glass plate has excellent rigidity, and the first surface and the second surface of the glass plate are planes with extremely high flatness, so that the glue layer coated on the second surface can be uniformly distributed, stress is further eliminated or reduced, the possibility of deformation or even damage of a thin metal code disc due to uneven stress is avoided, and the service life of the metal code disc is prolonged. And the reliability of the encoder is improved.

Description

Technical Field

[0001] This application relates to the field of encoder technology, specifically to an encoder rotor, an encoder, and a motor. Background Technology

[0002] Encoders are used to monitor positional information such as the rotational speed of moving equipment like motors. Taking optical encoders as an example, the rotor of an optical encoder includes a code disk and a code disk holder, both typically made of metal. The metal code disk and the metal code disk holder are bonded together with adhesive. Due to the poor surface flatness of the metal code disk holder, uneven adhesive distribution easily occurs. This uneven adhesive distribution can generate stress on the metal code disk, which is usually quite thin, leading to deformation and damage. Therefore, existing encoder rotors have poor reliability. Utility Model Content

[0003] This application aims to provide an encoder rotor, encoder, and motor, in which the adhesive layer can be evenly distributed through the arrangement of the glass plate, thereby eliminating or reducing stress generation, avoiding damage to the metal code disk, and improving the reliability of the encoder.

[0004] According to a first aspect of this application, this application provides an encoder rotor, comprising:

[0005] Code tray;

[0006] A glass plate having a first surface and a second surface, the first surface being adhered to the code tray holder;

[0007] A metal code disk, which is bonded to the second surface.

[0008] In one embodiment, the first surface and the second surface are parallel to each other.

[0009] In one embodiment, the top surface of the code disk holder is provided with a mounting groove for mounting a magnet; the bottom surface of the mounting groove is provided with a shaft hole penetrating the code disk holder for the motor shaft to extend into, so as to fix the code disk holder to the motor shaft.

[0010] In one embodiment, the code disk holder also has a flange protruding from the top surface and surrounding the groove of the mounting slot, and the glass plate also has a through hole, wherein the flange is located in the through hole when the first surface is bonded to the code disk holder.

[0011] In one embodiment, the metal code disk is provided with a code track, which is a code track composed of multiple light-transmitting areas and multiple non-light-transmitting areas, or the code track is a code track composed of multiple reflective areas and multiple non-reflective areas, or the code track is a code track composed of multiple metal bodies.

[0012] According to a second aspect of this application, this application provides an encoder, including the encoder rotor, a bracket, and a circuit board. The code disk holder is fixedly connected to the motor shaft. The front end of the bracket is fixed to the rear end cover of the motor. The circuit board is fixedly disposed at the rear end of the bracket. The circuit board senses the movement of the encoder rotor to obtain the position information of the motor shaft.

[0013] According to a third aspect of this application, this application provides an electric motor, characterized in that it includes the aforementioned encoder.

[0014] According to the encoder rotor, encoder, and motor of the above embodiments, since the glass plate has excellent rigidity and both the first and second surfaces of the glass plate are highly flat planes, the adhesive layer coated on the second surface can be evenly distributed, thereby eliminating or reducing the generation of stress. This avoids the possibility of deformation or even damage to the thin metal code disk due to uneven stress, thus improving the reliability of the encoder. Attached Figure Description

[0015] Figure 1 A perspective view of the encoder rotor provided in this application;

[0016] Figure 2 Exploded view of the encoder rotor provided in this application;

[0017] Figure 3 A top view of the encoder rotor provided in this application;

[0018] Figure 4 for Figure 3 Cross-sectional view along the AA direction;

[0019] Figure 5 A perspective view of the code disk holder in the encoder rotor provided in this application;

[0020] Figure 6 A perspective view of the encoder provided in this application;

[0021] Figure 7 Exploded view of the encoder provided in this application;

[0022] Figure 8 Top view of the encoder provided in this application;

[0023] Figure 9 for Figure 8 Cross-sectional view along the BB direction.

[0024] Figure label:

[0025] Encoder rotor 10, code disk holder 11, flange 111, annular mounting surface 112, mounting groove 113, shaft hole 114, glass plate 12, first surface 121, second surface 122, through hole 123, metal code disk 13, code track 131, magnet 14, adhesive layer 15, bracket 16, circuit board 17. Detailed Implementation

[0026] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0027] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments, and the operational steps involved in each embodiment can also be rearranged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the specification and drawings are only for clearly describing a particular embodiment and do not imply that they represent the necessary components and / or order.

[0028] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0029] An encoder is used to monitor the position information of a motor, such as its speed, torque, and rotation angle. The encoder includes an encoder rotor and an encoder stator. The encoder rotor consists of a metal code disk and a code disk holder. The encoder stator includes a bracket fixed to the rear end cover of the motor and a circuit board fixed to the rear end of the bracket. The code disk holder is fixed to the motor shaft, and the metal code disk is fixed on the code disk holder. In one embodiment, such as a transmissive optical encoder, a signal transmitting unit is provided on the side of the circuit board facing the metal code disk. The metal code disk also has areas where signals are blocked or passed through (e.g., code tracks). A signal receiving unit is provided on the other side of the metal code disk. The signal transmitting unit transmits a detection signal (e.g., a photoelectric signal) to the metal code disk. This detection signal can pass through the metal code disk and be received by the signal receiving unit. The circuit board can then output corresponding pulse signals under the action of a processor based on the changes in the signal received by the signal receiving unit. By calculating the number of pulses output per unit time (e.g., seconds), the current position information of the motor, such as its speed and rotation angle, can be reflected.

[0030] In related technologies, the metal code disk and the code disk holder are bonded together with adhesive. The installation of the metal code disk requires a high degree of flatness of the code disk holder surface. However, due to the poor flatness of the code disk holder surface, the adhesive on the code disk holder surface is unevenly distributed. Unevenly distributed adhesive is prone to generating stress on the metal code disk. Since the metal code disk is usually relatively thin, it is prone to deformation and damage, which further leads to poor encoder reliability.

[0031] See Figures 1-5 As shown, the encoder rotor 10 provided in this application includes a code disk holder 11, a glass plate 12, and a metal code disk 13.

[0032] like Figure 2 As shown, the glass plate 12 has a first surface 121 and a second surface 122. The first surface 121 of the glass plate 12 is bonded to the code disk holder 11, and the metal code disk 13 is bonded to the second surface 122.

[0033] A code track 131 is arranged around the metal code disk 13 along its axial direction. The code track 131 can transmit or reflect detection signals. The code disk support 11 is fixedly connected to the motor shaft, which can drive the code track 131 to rotate synchronously. This allows the detection signal to be processed and generate a relevant pulse signal to obtain the motor's position information. For the specific working principle of this encoder rotor, please refer to the following embodiments.

[0034] During the product assembly stage, adhesive layers 15 can be applied to the first surface 121 and the second surface 122, or to the top surface of the code disk holder 11 and the second surface 122 of the glass plate 12. The metal code disk 13 and the code disk holder 11 can be bonded to the first surface 121 and the metal code disk 13 to the second surface 122 by the setting of two adhesive layers 15 respectively.

[0035] In this embodiment, the glass plate 12 has excellent rigidity, and the first surface 121 and the second surface 122 of the glass plate 12 are both planes with extremely high flatness, which allows the adhesive layer 15 coated on the second surface 122 to be evenly distributed, thereby eliminating or reducing the generation of stress, so as to avoid the possibility of deformation or even damage to the thin metal code disk 13 due to uneven stress, and improve the reliability of the encoder.

[0036] In one embodiment of this application, the glass plate 12 is made by laser cutting and surface polishing of raw material glass plate, so that the first surface 121 and the second surface 122 of the glass plate 12 are planar.

[0037] In one embodiment, the encoder can be a photoelectric encoder, which can employ either a transmission detection signal detection method or a reflection detection signal detection method. Correspondingly, the code track 131 can be a code track composed of multiple light-transmitting areas and multiple light-non-light-transmitting areas, or the code track 131 can be a code track composed of multiple reflective areas and multiple non-reflective areas.

[0038] When using an encoder that uses transmission detection signals, a signal transmitting unit and a signal receiving unit can be set on both sides of the metal code disk 13. The signal transmitting unit can emit detection signals such as infrared signals, which are received by the signal receiving unit when passing through the light-transmitting area and reflected when passing through the non-light-transmitting area. In this way, as the code disk holder 11 rotates synchronously with the motor shaft, the processor processes the signals received by the signal receiving unit to obtain the position information of the motor shaft.

[0039] Of course, when using the detection method of reflection detection signal, a signal transmitting unit and a signal receiving unit can be set on the same side of the metal code disk 13. The detection signal emitted by the signal transmitting unit is reflected by the reflective area and thus received by the signal receiving unit. The detection signal is absorbed or transmitted when passing through the non-reflective area. In this way, during the synchronous rotation of the code disk holder 11 with the motor shaft, the processor processes the signal received by the signal receiving unit to obtain the position information of the motor shaft.

[0040] The encoder can also be an inductive encoder. The circuit board of the inductive encoder is also equipped with a magnetic induction coil. The code track 131 of the metal code disk 13 is composed of multiple metal bodies. When the motor shaft of the code disk support 11 rotates synchronously, the multiple metal bodies can cause the magnetic induction coil to generate a changing inductance value. By measuring the change in inductance in the magnetic induction coil, the position information of the motor shaft can be obtained.

[0041] In this application, taking a transmissive optical encoder as an example, when the detection signal emitted by the signal transmitting unit passes through the glass plate 12, the positions of the signal transmitting unit and the signal receiving unit are relatively fixed, and the detection signal passes through the glass plate 12 in a basically vertical manner and is received by the signal receiving unit. If the code disk holder 11 is tilted, the transmission of the detection signal will be deviated, thereby affecting the accuracy of the detection result.

[0042] In this application, when the first surface 121 is bonded to the code tray 11, the first surface 121 and the second surface 122 are parallel to each other, so that the glass plate 12 can be in a relatively horizontal state.

[0043] It should be noted that the glass plate 12 is in a horizontal state because Figures 1-4 The following example illustrates the perspective shown. Figures 1-4 The encoder rotor 10 shown is positioned vertically. If... Figures 1-4 If the encoder rotor shown is set in the lateral direction, then the glass plate 12 should be in a relatively vertical state.

[0044] See Figure 2 , Figure 4 and Figure 5 As shown, the code disk holder 11 is also provided with a mounting groove 113 and a shaft hole 114. The mounting groove 113 is provided on the top surface of the code disk holder 11 and is used to install the magnet 14. The shaft hole 114 is on the bottom surface of the mounting groove 113 and penetrates through the code disk holder 11, so that the shaft hole 114 and the mounting groove 113 are coaxially arranged and the shaft hole 114 penetrates through the mounting groove 113. In one embodiment, the encoder is an inductive encoder. The mounting groove 113 is used to install the magnet 14, and the shaft hole 113 is used to connect the motor shaft to fix the code disk holder 11 to the motor shaft, so that the code disk holder 11 can rotate synchronously with the motor shaft. When rotating synchronously with the motor shaft, the magnet 14 generates a magnetic field signal. The position information of the motor shaft can be obtained by detecting the magnetic field signal.

[0045] As one example, such as Figure 4 As shown, in this embodiment, a flange 111 is also provided on the top surface of the code disk holder 11. The flange 111 is arranged around the opening of the mounting groove 113, such as... Figure 2 As shown, the glass plate 12 is also provided with a through hole 123. When the first surface 121 is bonded to the code plate holder 11, the flange 111 is located inside the through hole 123. By setting the flange, the installation position of the glass plate can be positioned to prevent the glass plate from blocking the magnet 14 in the mounting groove 113.

[0046] This application also provides an encoder, see [link to document]. Figures 6-9As shown, the encoder includes the encoder rotor 10 described in the above embodiment, as well as a bracket 16 and a circuit board 17. The code disk holder 11 is fixedly connected to the motor shaft. The front end of the bracket 16 is fixed to the rear end cover of the motor. The circuit board 17 is fixed to the rear end of the bracket 16. The circuit board 16 senses the movement of the encoder rotor to obtain the position information of the motor shaft.

[0047] The encoder provided in this application takes a transmission-type photoelectric encoder as an example. The circuit board 17 is preferably located on one side of the metal code disk 13. A signal transmitting unit is provided on the circuit board 17, and a signal receiving unit is provided on the other side of the metal code disk 13. The signal transmitting unit can transmit light signals to the code track 131 on the metal code disk 13. The light signals transmitted through the code track 131 can be received by the signal receiving unit. As the motor shaft rotates, the code disk support 11 rotates synchronously. The processor on the circuit board 17 processes the signals received by the signal receiving unit, and by calculating the number of output pulses per unit time (e.g., seconds), the current position information such as the motor speed and rotation angle can be reflected.

[0048] This application also provides a motor, including the encoder described in the above embodiments. For the specific structural features of the encoder, please refer to the above embodiments, which will not be repeated here.

[0049] In summary, in the encoder rotor, encoder, and motor provided by this application, the glass plate 12 has excellent rigidity, and both the first surface 121 and the second surface 122 of the glass plate 12 are highly flat planes, which allows the adhesive layer 15 coated on the second surface 122 to be evenly distributed, thereby eliminating or reducing the generation of stress. This avoids the possibility of deformation or even damage to the thin metal code disk 13 due to uneven stress, thus improving the reliability of the encoder.

[0050] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. An encoder rotor, characterized by The application relates to an encoder rotor, comprising: a code disc holder; a glass plate, the glass plate having a first surface and a second surface, the first surface being bonded to the code disc holder; a metal code disc, the metal code disc being bonded to the second surface; the first surface and the second surface being parallel to each other.

2. The encoder rotor of claim 1, wherein A mounting groove is formed in the top surface of the code disc holder, the mounting groove being used for mounting a magnetic steel; an axle hole is formed in the bottom surface of the mounting groove and penetrating through the bottom surface of the code disc holder, the axle hole being used for a motor shaft to extend into, so as to fix the code disc holder to the motor shaft.

3. The encoder rotor of claim 2, wherein The code disc holder further has a flange which is arranged on a slot opening of the mounting groove and protruding from the top surface; the glass plate is further provided with a through hole, and when the first surface is bonded to the code disc holder, the flange is located in the through hole.

4. The encoder rotor of any one of claims 1-3, wherein, The metal code disc is provided with a code track, the code track being a code track composed of a plurality of light transmission areas and a plurality of non-light transmission areas, or the code track being a code track composed of a plurality of light reflection areas and a plurality of non-light reflection areas, or the code track being a code track composed of a plurality of metal bodies.

5. An encoder, characterized by The application further relates to an encoder, comprising the encoder rotor as claimed in any one of claims 1 to 4, further comprising a bracket and a circuit board, the code disc holder being fixedly connected to the motor shaft, the front end of the bracket being fixed to the rear end cover of the motor, the circuit board being fixedly arranged at the rear end of the bracket, the circuit board sensing the movement of the encoder rotor to obtain the position information of the motor shaft.

6. An electric machine characterized by The application further relates to an encoder, comprising the encoder as claimed in claim 5.

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