Alternating current motor encoder mounting structure

Abstract

The utility model discloses an AC motor encoder installation structure, which comprises a stator, a rotor, a front end cover, a rear end cover, a casing, a motor shaft and an encoder, the encoder comprises an encoder gear ring and an encoder sensor, the encoder gear ring is installed on the motor shaft and located in an inner cavity of the rear end cover, and the encoder sensor is installed on the motor shaft and located in an inner cavity of the rear end cover. The encoder sensor is provided with a cylindrical barrel and a barrel mounting plate fixed with the barrel, the barrel mounting plate is mounted on the outer wall of the casing, a protruding block protruding inwards is arranged on the inner wall of the rear end cover, a through hole is formed in the protruding block in the radial direction of the rear end cover, and the through hole is communicated with the barrel mounting plate. The diameter of the through hole is larger than or equal to the diameter of a cylinder body of the encoder sensor, and the cylinder body of the encoder sensor is arranged in the through hole of the protruding block. According to the utility model, the installation position precision of the encoder is improved, the influence of internal and external vibration of the motor on the encoder in the operation process can be weakened or prevented, and the signal acquisition and transmission accuracy and reliability of the encoder are improved.

Description

Technical Field

[0001] The utility model relates to an AC motor, in particular to an encoder mounting structure of an AC motor, belonging to the technical field of motors. Background Art

[0002] The existing encoder mounting structure of an AC motor includes a stator, a rotor, a front end cover, a rear end cover, a housing, a motor shaft and an encoder. The stator is fixedly installed on the inner wall of the housing, the rotor is fixedly installed on the motor shaft, the front end cover is fixedly installed on the front end face of the housing, the rear end cover is fixedly installed on the rear end face of the housing. The encoder includes an encoder gear ring and an encoder sensor. The encoder gear ring is installed on the motor shaft and located inside the inner cavity of the rear end cover. The encoder sensor has a cylindrical barrel and a barrel mounting plate fixed to the barrel. The barrel mounting plate is fixedly installed on the outer wall of the housing by screws. The existing encoder mounting structure of an AC motor has the following disadvantages in actual work: that is, due to the thin housing and the small contact area between the barrel mounting plate and the housing, and because the barrel of the encoder is not fixed inside the motor and is in a suspended state, therefore, such a structure affects the installation position accuracy of the encoder on the one hand, and on the other hand, during the operation of the motor, due to the vibration of the motor itself or external vibration, the encoder generates vibration, thereby affecting the accuracy of encoder signal acquisition and transmission. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide an encoder mounting structure of an AC motor that can greatly improve the installation position accuracy of the encoder, weaken or prevent the influence of internal and external vibrations of the motor on the encoder during operation, and improve the accuracy and reliability of encoder signal acquisition and transmission.

[0004] To solve the above technical problem, the utility model adopts such an encoder mounting structure of an AC motor, including a stator, a rotor, a front end cover, a rear end cover, a housing, a motor shaft and an encoder. The stator is installed on the inner wall of the housing, the rotor is installed on the motor shaft, the front end cover is installed on the front end face of the housing, the rear end cover is installed on the rear end face of the housing. The encoder includes an encoder gear ring and an encoder sensor. The encoder gear ring is installed on the motor shaft and located inside the inner cavity of the rear end cover. The encoder sensor has a cylindrical barrel and a barrel mounting plate fixed to the barrel. The barrel mounting plate is installed on the outer wall of the housing. A convex block protruding inwards is provided on the inner wall of the rear end cover. A through hole along the radial direction of the rear end cover is opened on the convex block. The diameter of the through hole is greater than or equal to the diameter of the barrel of the encoder sensor. The barrel of the encoder sensor is placed in the through hole of the convex block.

[0005] As a preferred embodiment of the present utility model, an annular groove is further provided at the outer end of the through hole of the bump, and an O-ring is installed in the annular groove.

[0006] As a preferred embodiment of the present utility model, the cross-sectional shape of the bump is rectangular or trapezoidal, and the bump is an integral part integrally formed with the rear end cover.

[0007] After adopting the above structure, the present utility model has the following beneficial effects:

[0008] The present utility model provides a bump protruding inward on the inner wall of the rear end cover, and a through hole along the radial direction of the rear end cover is provided on the bump. The diameter of the through hole is greater than or equal to the diameter of the cylinder body of the encoder sensor, and the cylinder body of the encoder sensor is placed in the through hole of the bump. Such a structure can effectively support the encoder, prevent the cylinder body of the encoder from being in a suspended state, greatly improve the installation position accuracy of the encoder, and can weaken or prevent the influence of the vibration inside and outside the motor during operation on the encoder, improve the accuracy and reliability of the encoder signal acquisition and transmission. Moreover, such a structure can also effectively protect the encoder.

[0009] The present utility model provides an annular groove at the outer end of the through hole of the bump, and an O-ring is installed in the annular groove. Such a structure can better fix the encoder and further weaken or prevent the influence of the vibration inside and outside the motor during operation on the encoder.

[0010] The structure of the present utility model is simple, the manufacturing cost is low, and it is convenient for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The following further details the specific embodiments of the present utility model with reference to the drawings.

[0012] Figure 1 FIG. is a schematic structural diagram of an installation structure of an encoder of an AC motor of the present utility model.

[0013] Figure 2 FIG. is a schematic installation structure diagram of a rear end cover, a motor shaft and an encoder in the present utility model.

[0014] Figure 3 FIG. is a schematic structural diagram of a rear end cover in the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] See Figures 1 to 3An installation structure of an AC motor encoder shown in the figure includes a stator, a rotor, a front end cover, a rear end cover 1, a housing 2, a motor shaft 3 and an encoder. The stator, rotor and front end cover are not shown in the figure. The stator is fixedly installed on the inner wall of the housing 2 through a stator bracket. The rotor is fixedly installed on the motor shaft 3. The front end cover is fixedly installed on the front end face of the housing 2. The rear end cover 1 is fixedly installed on the rear end face of the housing 2. The encoder includes an encoder gear ring 4 and an encoder sensor 5. The encoder gear ring 4 is installed on the motor shaft 3 through a key connection structure and is located inside the cavity of the rear end cover 1. The encoder sensor 5 has a cylindrical body 5a and a body mounting plate 5b fixedly connected to the body 5a. The body mounting plate 5b is fixedly installed on the outer wall of the housing 2 through screws 6. During operation, the encoder sensor 5 detects the angular displacement of the encoder gear ring 4 and converts it into an electrical signal, thereby precisely controlling the speed of the motor. A convex block 1-1 protruding inward is provided on the inner wall of the rear end cover 1. A through hole 1a along the radial direction of the rear end cover 1 is opened on the convex block 1-1. The diameter of the through hole 1a is greater than or equal to the diameter of the body 5a of the encoder sensor 5. Preferably, the diameter of the through hole 1a is equal to or slightly larger than the diameter of the body 5a. The body 5a of the encoder sensor 5 is placed in the through hole 1a of the convex block 1-1.

[0016] As a preferred embodiment of the present invention, as Figure 2 , 3 shown, an annular groove 1b is further provided at the outer end of the through hole 1a of the convex block 1-1. An O-ring is installed in the annular groove 1b. The O-ring is not shown in the figure.

[0017] As a preferred embodiment of the present invention, as Figure 2 , 3 shown, the cross-sectional shape of the convex block 1-1 is rectangular or trapezoidal. The convex block 1-1 is an integral part integrally formed with the rear end cover 1.

[0018] After trial use, the structure of the present invention is simple, improves the installation position accuracy of the encoder, can weaken or prevent the influence of the vibration inside and outside the motor on the encoder during operation, improves the accuracy and reliability of encoder signal acquisition and transmission, and achieves good practical effects.

Claims

1. An AC motor encoder mounting structure, comprising a stator, a rotor, a front end cover, a rear end cover (1), a housing (2), a motor shaft (3) and an encoder, wherein the stator is mounted on the inner wall of the housing (2), the rotor is mounted on the motor shaft (3), the front end cover is mounted on the front end surface of the housing (2), the rear end cover (1) is mounted on the rear end surface of the housing (2), the encoder comprises an encoder gear ring (4) and an encoder sensor (5), the encoder gear ring (4) is mounted on the motor shaft (3) and is located in the inner cavity of the rear end cover (1), the encoder sensor (5) comprises a cylindrical barrel (5a) and a barrel mounting plate (5b) fixed to the barrel (5a), the barrel mounting plate (5b) is mounted on the outer wall of the housing (2), and is characterized in that: A convex block (1-1) protruding inwards is provided on the inner wall of the rear end cover (1), a through hole (1a) is provided on the convex block (1-1) along the radial direction of the rear end cover (1), the diameter of the through hole (1a) is greater than or equal to the diameter of the barrel (5a) of the encoder sensor (5), and the barrel (5a) of the encoder sensor (5) is placed in the through hole (1a) of the convex block (1-1).

2. The AC motor encoder installation structure according to claim 1, characterized in that: An annular groove (1b) is also provided at the outer end of the through hole (1a) of the protrusion (1-1), and an O-shaped rubber ring is installed in the annular groove (1b).

3. The AC motor encoder installation structure according to claim 1 or 2, characterized in that: The cross-sectional shape of the protrusion (1-1) is rectangular or trapezoidal, and the protrusion (1-1) is an integral piece made integrally with the rear end cover (1).

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