Encoder mounting structure and motor

Abstract

The utility model relates to the technical field of motors, and discloses an encoder installation structure and a motor, the encoder installation structure comprises an encoder and an outer sealing cover, the center of an end cover at one end of the motor forms a first via hole for a motor rotating shaft to pass through, and the outer end surface of the end cover is recessed inwards to form an installation cavity concentric with the first via hole. A mounting cavity is formed in the end cover, the encoder is mounted in the mounting cavity, the outer sealing cover is detachably arranged on the end cover and covers the encoder in a sealing manner, a stator part of the encoder is pressed and fixed on the end cover by the outer sealing cover, a rotor part of the encoder is sleeved on a motor rotating shaft, and a wiring channel for wiring of a wiring harness of the encoder is formed in the end cover. The external space of the end cover is ingeniously and innovatively utilized to install the encoder, the number of parts is greatly reduced, the encoder can be positioned by matching with the outer sealing cover, the disassembly and assembly are simple and convenient, and the maintenance difficulty is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, especially encoder mounting structure and motor. BACKGROUND

[0002] The motor with encoder is called closed loop motor, and the motor without encoder is called open loop motor. The closed loop motor has many obvious advantages. On the one hand, the encoder can feedback the angle and position of the rotor in real time, so that the encoder can more accurately capture the magnetic field direction. On this basis, the current of the motor can reach the optimal state during operation. The encoder transmits the feedback signal to the control system, and then controls the current in the optimal way to achieve energy-saving and efficient operation effect. On the other hand, the encoder plays a particularly significant role in the working condition of heavy load and low speed start. When running at no load, the current of the closed loop motor can be maintained at a very low level. For high-power motors, this difference is more obvious.

[0003] Although the existing patent (CN202889159U) discloses a single-head motor installation encoder technical scheme, but the encoder in the scheme has the following problems: 1. The installation process needs to use two parts of the encoder seat and the encoder rotor ring frame, which not only increases the error risk of tolerance accumulation, but also increases the difficulty of part management, and the tolerance accumulation error is easy to cause assembly failure. 2. The encoder of the scheme is arranged on the inner side of the bearing, which is extremely difficult to disassemble; once the encoder needs to be replaced due to the decrease of precision due to the increase of service life, since the bearing adopts the interference fit with the shaft, the disassembly process is extremely difficult, often needs to be assisted by a puller tool, but the scheme does not reserve space for puller operation, and the whole disassembly and replacement process lacks reasonable consideration.

[0004] It can be seen that the prior art needs to be improved and improved. UTILITY MODEL CONTENTS

[0005] In view of the above shortcomings of the prior art, the purpose of the utility model is to provide an encoder mounting structure and a motor, which solves the technical problem of difficult installation and disassembly.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] An encoder mounting structure comprises an encoder and an outer cover, a first through hole for a motor shaft is formed in the center of an end cover of one end of a motor, the outer end of the end cover is recessed inward to form a mounting cavity concentric with the first through hole, the encoder is mounted in the mounting cavity, the outer cover is detachably arranged on the end cover and covers the encoder, the stator part of the encoder is pressed on the end cover by the outer cover, the rotor part of the encoder is sleeved on the motor shaft, and a wiring channel for the wire harness of the encoder is arranged on the end cover.

[0008] As a further improvement of the above technical solution, the wire channel comprises a first wire slot formed on the top of the mounting cavity and a wire inclined hole penetrating through the inside and outside of the end cover, and the wire harness of the encoder is embedded into the first wire slot and then extends into the motor along the wire inclined hole.

[0009] As a further improvement of the above technical solution, the back surface of the outer cover is provided with a stop opening for pressing the stator part of the encoder and a second wire slot aligned with the first wire slot.

[0010] As a further improvement of the above technical solution, a second through hole is formed at the center of the outer cover, and a positioning flange for mounting a sealing ring is formed by inwardly recessing around the second through hole, and the positioning flange is in a C shape.

[0011] As a further improvement of the above technical solution, a plurality of mounting holes are formed on the outer cover, a plurality of threaded holes corresponding to the mounting holes are formed on the end cover, and a screw is arranged at each mounting hole to cooperate with the corresponding threaded hole.

[0012] As a further improvement of the above technical solution, the encoder is a reluctance resolver.

[0013] As a further improvement of the above technical solution, the rotor part of the reluctance resolver is connected to the motor shaft by a key connection mode, and the motor shaft is provided with an axial positioning shaft stop ring for the rotor part of the reluctance resolver.

[0014] The utility model also provides a motor which comprises a motor shaft and the encoder mounting structure.

[0015] As a further improvement of the above technical solution, the motor shaft is a single-end shaft.

[0016] As a further improvement of the above technical solution, the motor shaft is a double-end shaft.

[0017] The encoder mounting structure provided by the utility model ingeniously utilizes the external space of the end cover to install the encoder, and the structure is exquisite, the number of parts is greatly reduced, the encoder can be positioned by cooperating with the outer cover, the outer cover effectively prevents external objects from directly contacting the encoder, avoids damage of the encoder due to collision, greatly reduces the entry of dust and sundries into the encoder, and ensures the accuracy and reliability of the encoder.

[0018] The motor provided by the utility model has all the advantages of the encoder mounting structure. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1The utility model provides a motor's perspective view.

[0020] Figure 2 The utility model provides a motor's perspective view after unloading outer seal cover, the wire harness of encoder is not drawn.

[0021] Figure 3 It is a schematic view for an encoder embodiment.

[0022] Figure 4 The utility model provides a motor's perspective view after unloading outer seal cover, the wire harness of encoder is not drawn.

[0023] Figure 5 It is Figure 4 The local enlarged view of L area.

[0024] Figure 6 It is a perspective view for end cover.

[0025] Figure 7 It is a perspective view for outer seal cover Figure 1 .

[0026] Figure 8 It is a perspective view for outer seal cover Figure 2 .

[0027] Main element symbol explanation: 21-end cover, 211-first through hole, 212-installation cavity, 213-wiring channel, 2131-first wiring slot, 2132-wiring inclined hole, 214-thread hole, 215-screw, 216-wiring area, 3-motor rotating shaft, 41-rotor iron core, 42-stator iron core, 43-magnetic steel, 44-stator winding, 46-bearing, 6-encoder, 61-stator part, 62-rotor part, 63-wire harness, 7-outer seal cover, 71-stop mouth, 72-second wiring slot, 73-positioning flange, 74-mounting hole, 75-second through hole, 81-axle check ring, 9-sealing ring. Specific implementation

[0028] The utility model provides a kind of encoder installation structure and motor, to make the purpose, technical scheme and effect of the utility model more clear, definite, the following referring to drawing and taking example for further detailed description of the utility model of embodiment.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the protection scope of the utility model.

[0029] Please refer to Figures 1 to 8The utility model provides a kind of encoder mounting structure, including encoder 6 and outer cover 7, the end cover 21 center of one end of motor forms the first via hole 211 for motor rotating shaft 3 to pass through, the outer end of the end cover 21 is recessed to form the mounting cavity 212 concentric with the first via hole 211, the encoder 6 is installed in the mounting cavity 212, the outer cover 7 can be detachably arranged on the end cover 21 and covers encoder 6, the stator part 61 of encoder 6 is pressed on the end cover 21 by the outer cover 7, the rotor part 62 of encoder 6 is sleeved on motor rotating shaft 3, wiring channel 213 for the wiring of the wiring harness 63 of encoder 6 is provided on the end cover 21.

[0030] The rotor part 62 of encoder 6 is sleeved on motor rotating shaft 3, synchronously rotates with rotating shaft, and its stator part 61 is pressed on the end cover 21 by the outer cover 7 and remains stationary. In this way, encoder 6 can detect the rotation of the rotor in real time, and the angle and position information of the rotor is transmitted to the control system in the form of electrical signals through the wiring harness 63 along the wiring channel 213 on the end cover 21. The control system accurately controls the current according to the signal fed back by the encoder 6, so that the current during motor operation is in an optimized state, achieving efficient operation.

[0031] The encoder mounting structure provided by the utility model ingeniously installs encoder 6 using the external space of end cover 21, has exquisite structure, greatly reduces the number of parts, and, in combination with outer cover 7, can position encoder 6, the outer cover 7 also effectively prevents external objects from directly contacting encoder 6, avoids damage to encoder 6 due to collision, greatly reduces the entry of dust and sundries into the interior of encoder 6, and ensures the accuracy and reliability of encoder 6.

[0032] It should be noted that, since the rotor part 62 of encoder 6 is located outside bearing 46, when encoder 6 needs to be replaced due to decreased accuracy caused by increased service life, bearing 46 in interference fit does not need to be disassembled, outer cover 7 is disassembled, and encoder 6 can be replaced, greatly simplifying the disassembly and assembly process, reducing maintenance difficulty, and improving maintenance efficiency. In addition, the wiring channel 213 is specially provided on the end cover 21, so that the wiring harness 63 of encoder 6 has a special wiring space, wiring is more regular, avoids the security risks and signal interference problems caused by disordered wiring harness 63, and helps to improve the overall performance and stability of the motor.

[0033] Specifically, the wire channel 213 includes a first wire slot 2131 opened at the top of the mounting cavity 212 and a wire inclined hole 2132 through the inside and outside of the end cover 21, and the wire harness 63 of the encoder 6 is embedded in the first wire slot 2131 and then extends into the motor along the wire inclined hole 2132. The design of the wire slot and the wire inclined hole 2132 makes full use of the space of the end cover 21, reasonably guides the wire harness 63 in the limited space, avoids the wire harness 63 occupying too much unnecessary space, makes the internal space layout of the motor more compact and reasonable, and improves the space utilization.

[0034] Further, the back surface of the outer cover 7 is provided with a stop 71 pressing the stator part 61 of the encoder 6 and a second wire slot 72 aligned with the first wire slot 2131. The circumferential position of the stator part 61 of the encoder 6 is mainly determined according to the wire harness 63 wire position of the encoder 6. When the stop 71 is tightly pressed with the stator part 61 of the encoder 6, it not only ensures that the encoder 6 will not displace due to vibration during the operation of the motor, guarantees the accuracy and stability of the measurement of the encoder 6, but also avoids the internal components from being worn out due to the shaking of the encoder 6, prolonging the service life of the encoder 6. In addition, the combination of the first wire slot 2131 and the second wire slot 72 forms a larger wire area 216, which provides sufficient space for the wire harness 63 of the encoder 6. When the wire harness 63 is arranged in it, it will not be squeezed or excessively bent due to the cramped space. This not only effectively protects the insulation layer of the wire harness 63 and prevents short circuit and other electrical faults caused by damage due to squeezing, but also ensures the stability of the physical properties of the wire in the wire harness 63, and guarantees the accuracy of signal transmission. The spacious wire area 216 provides more ample operating space for the installer when arranging the wire harness 63 of the encoder 6 into the wire slot, making it easier to operate without having to be careful to avoid the wire harness 63 from being entangled with each other or being difficult to place due to the small space. This greatly improves the installation efficiency and reduces the risk of damage to the wire harness 63 caused by inconvenient operation during installation.

[0035] Further, the center of the outer cover 7 forms a second through hole 75, and the periphery of the second through hole 75 is inwardly recessed to form a positioning flange 73 for installing the sealing ring 9, which is C-shaped. The C-shaped positioning flange 73 provides a precise installation position for the sealing ring 9, which can be specifically selected as a lip-shaped sealing ring 9, ensuring that the sealing ring 9 can be accurately installed at the center of the outer cover 7 and precisely connected with the parts that need to be sealed. This effectively avoids the displacement or misplacement of the sealing ring 9 during installation, guarantees the effectiveness of the sealing, and better prevents dust, water vapor and other impurities from entering the motor interior, protecting the encoder 6 and other critical components.

[0036] Preferably, the outer cover 7 is provided with a plurality of mounting holes 74, and the end cover 21 is provided with a plurality of threaded holes 214 corresponding to the mounting holes 74. Each mounting hole 74 is provided with a screw 215 matched with the corresponding threaded hole 214. The fastening of the plurality of screws 215 enhances the overall structural strength of the connection between the outer cover 7 and the end cover 21. During the operation of the motor, whether it is vibration, impact or other external forces, this uniform stress distribution can effectively avoid local stress concentration, ensuring that the outer cover 7 is always tightly fixed on the end cover 21, and ensuring the stable operation environment of the encoder 6.

[0037] In this embodiment, the encoder 6 is a magneto-resistive rotary transformer. The magneto-resistive rotary transformer has a relatively simple structure and a small size, which is convenient for installation in the limited space of the motor. Moreover, it has no complex mechanical transmission components inside, reducing the risk of failure caused by mechanical wear and tear, and reducing maintenance costs and difficulty. During the entire life cycle of the motor, users can enjoy lower maintenance costs and higher operating efficiency.

[0038] The rotor part 62 of the magneto-resistive rotary transformer is connected to the motor shaft 3 by a key connection method, and the motor shaft 3 is provided with an axial stop ring 81 for axially positioning the rotor part 62 of the magneto-resistive rotary transformer. The axial stop ring 81 can ensure the axial position of the rotor part 62 on the motor shaft 3 to be stable, avoiding the axial movement of the rotor part 62 during the operation of the motor, and ensuring that the relative position relationship between the magneto-resistive rotary transformer and the motor shaft 3 remains unchanged. Axial movement can cause measurement errors and affect the closed-loop control accuracy of the motor. It can also prevent the rotor part 62 from colliding or rubbing with other components due to axial movement, avoiding damage to the components.

[0039] In summary, the installation process of the encoder 6 is as follows: first, place the stator part 61 of the magneto-resistive rotary transformer in the installation cavity 212 of the end cover 21, and make sure that the installation position is accurate. At this time, pay attention to the cooperation between the stator part 61 and the installation cavity 212, and the relative position relationship between the wire harness 63 of the magneto-resistive rotary transformer and the wiring channel 213. Then, install the rotor part 62 of the magneto-resistive rotary transformer on the motor shaft 3 by means of key connection, and make sure that the key and the key groove are accurately matched to ensure effective transmission of torque. Then, install the shaft stop ring 81 to axially position the rotor part 62, so that the axial position of the rotor part 62 on the motor shaft 3 is stable, and the rotor part 62 is prevented from moving. Connect the wire harness 63 according to the correct wiring channel 213, generally by first embedding the first wiring groove 2131 at the top of the installation cavity 212 of the end cover 21, and then extending into the shell along the wiring inclined hole 2132, and connecting with the junction box in the shell, to ensure that the electrical connection is correct and firm. Finally, align the second wiring groove 72 of the outer cover 7 with the first wiring groove 2131, and then align the installation hole 74 with the threaded hole 214 on the end cover 21, and fix it with the screw 215. After the outer cover 7 is installed, the stop 71 on the back of the outer cover 7 will press the stator part 61 of the magneto-resistive rotary transformer, further fixing the encoder 6. Finally, install the sealing ring 9 on the positioning flange 73, so that the sealing ring 9 can effectively seal and prevent dust, water vapor and the like from entering the motor.

[0040] The disassembly process of the encoder 6 is as follows: first, remove the outer cover 7 from the end cover 21 by unscrewing the screws 215 at the installation holes 74 of the outer cover 7. These screws 215 cooperate with the corresponding threaded holes 214 on the end cover 21, and after removal, the outer cover 7 can be removed, thereby exposing the magneto-resistive rotary transformer; then, disconnect the wire harness 63 of the magneto-resistive rotary transformer. Since the rotor part 62 of the magneto-resistive rotary transformer is connected to the motor shaft 3 by means of key connection and is axially positioned by the shaft stop ring 81, the shaft stop ring 81 should be removed first, which can be done using a special tool (such as a stop ring clamp). After removing the stop ring, use a suitable tool to move the rotor part 62 along the direction of the key from the motor shaft 3, thereby completing the disassembly of the rotor part 62. Finally, remove the stator part 61 of the magneto-resistive rotary transformer from the installation cavity 212 of the end cover 21. Since the stator part 61 was previously pressed by the stop 71 of the outer cover 7, after the outer cover 7 is removed, the stator part 61 is relatively easy to remove, but care should be taken to avoid damaging the installation cavity 212 or the stator part 61 itself.

[0041] The utility model also provides a motor, the motor includes motor rotating shaft 3 and the encoder installation structure of above -mentioned embodiment, namely after motor installs encoder 6 can be the displacement single -end closed loop motor or double -end closed loop motor, can understand, the motor rotating shaft 3 of single -end closed loop motor is single -end rotating shaft, and one end of motor rotating shaft is transmission end, and all can be connected with other equipment through the mode of key connection, the motor rotating shaft 3 of double -end closed loop motor is double -end rotating shaft, and both ends of motor rotating shaft are transmission end, and all can be connected with other equipment through the mode of key connection.

[0042] In the description of the utility model, it is understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0043] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, can also be detachable connection, or integrally connected, can be mechanical connection, can also be electrical connection or can communicate with each other, can be directly connected, or indirectly connected through intermediate medium, can be the communication or interaction relationship between two elements inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0044] It can be understood that, for ordinary skilled in the art, the technical scheme of the utility model and the utility model concept can be replaced or changed equivalently, and all these changes or replacements should belong to the protection scope of the utility model.

Claims

1. An encoder mounting structure, characterized in that, The device includes an encoder and an outer cover. The center of the end cover at one end of the motor forms a first through hole through which the motor shaft passes. The outer end face of the end cover is recessed inward to form a mounting cavity concentric with the first through hole. The encoder is installed in the mounting cavity. The outer cover is detachably mounted on the end cover and covers the encoder. The outer cover presses the stator part of the encoder onto the end cover. The rotor part of the encoder is fitted onto the motor shaft. The end cover is provided with a wiring channel for the encoder's wiring harness.

2. The encoder mounting structure according to claim 1, characterized in that, The wiring channel includes a first wiring groove opened at the top of the mounting cavity and a wiring oblique hole that runs through the inner and outer sides of the end cover. After the encoder wiring harness is embedded in the first wiring groove, it extends into the motor along the wiring oblique hole.

3. The encoder mounting structure according to claim 2, characterized in that, The back of the outer cover is provided with a stop that presses down on the stator of the encoder and a second wiring groove that is aligned with the first wiring groove.

4. The encoder mounting structure according to claim 3, characterized in that, A second through hole is formed at the center of the outer cover, and the area around the second through hole is recessed inward to form a positioning flange for installing the sealing ring. The positioning flange is C-shaped.

5. The encoder mounting structure according to claim 1, characterized in that, The outer cover has multiple mounting holes, and the end cover has threaded holes that are the same number as the mounting holes and correspond one-to-one. Each mounting hole is provided with a screw that mates with the corresponding threaded hole.

6. The encoder mounting structure according to claim 1, characterized in that, The encoder is a magnetoresistive rotary transformer.

7. The encoder mounting structure according to claim 6, characterized in that, The rotor of the reluctance rotary transformer is connected to the motor shaft via a key connection, and the motor shaft is provided with a retaining ring for axial positioning of the rotor of the reluctance rotary transformer.

8. An electric motor, characterized in that, It includes a motor shaft and an encoder mounting structure as described in any one of claims 1-7.

9. The motor according to claim 8, characterized in that, The motor shaft is a single-head shaft.

10. The motor according to claim 8, characterized in that, The motor shaft is a double-headed shaft.

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