Position sensor mounting structure of pumping unit motor

Abstract

The utility model discloses a position sensor mounting structure of a pumping unit motor, which comprises a motor shell, a motor stator, a motor rotor and a motor rotating shaft, a motor end cover is mounted at the port of the motor shell to realize sealing, the motor stator is fixedly mounted in the inner cavity of the motor shell, and the motor rotor is positioned in the middle of the motor stator. The motor rotating shaft axially penetrates through the middle of the motor rotor, an annular supporting frame is arranged between the outer side of the motor rotating shaft and the motor rotor, a mounting seat is concentrically mounted on the inner side of the motor end cover, the mounting seat is annular, an annular groove is formed in the inner side of the mounting seat, a matched encoder stator is mounted in the annular groove in a clamped mode, and the encoder stator is in a circular arc shape. An encoder rotor is concentrically installed on the side face of the supporting frame, the encoder rotor is of a circular ring piece structure, and the encoder rotor and the encoder stator are opposite front and back and are close to each other. The angular positions of the motor rotor and the motor rotating shaft are detected through the encoder assembly, hovering control is conveniently achieved, and overhaul or maintenance is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a position sensor installation structure for an oil pumping unit motor. Background Art

[0002] With the increasing adoption of intelligent technologies in the oilfield industry and the promotion of energy conservation and carbon reduction, the use of disc-type rare earth permanent magnet motors to replace conventional pulleys and asynchronous motors is gaining momentum and is a growing trend in the oilfield industry. Permanent magnet synchronous disc motors can be directly mounted on the input shaft of the reduction gearbox to drive the entire pumping unit. Currently, the industry utilizes encoderless control, which provides excellent control under normal operating conditions. However, in some special situations, such as hovering control during maintenance or inspection, encoderless motors are not well suited because the required control accuracy is insufficient. Utility Model Content

[0003] The purpose of the present utility model is to provide a position sensor mounting structure for an oil pumping unit motor, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a position sensor mounting structure of an oil pumping unit motor, comprising a motor housing, a motor stator, a motor rotor and a motor shaft, a motor end cover is installed at the port of the motor housing to achieve closure, the motor stator is fixedly installed in the inner cavity of the motor housing, the motor rotor is located in the middle of the motor stator, the motor shaft axially passes through the middle of the motor rotor, an annular support frame is provided between the outer side of the motor shaft and the motor rotor, a mounting seat is concentrically installed on the inner side of the motor end cover, the mounting seat is annular and has an annular groove on the inner side, a matching encoder stator is clamped and installed in the annular groove, the encoder stator is arc-shaped, the encoder rotor is concentrically installed on the side of the support frame, the encoder rotor is a circular ring structure, the encoder rotor and the encoder stator are opposite to each other front and back and close to each other.

[0005] Preferably, steps are provided on the outer sides of both ends of the motor shaft, roller bearings are installed on the steps, and the outer rings of the two roller bearings are fixedly installed corresponding to the motor housing and the motor end cover.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention detects the angular position of the motor rotor through the encoder assembly, thereby facilitating hovering control and enabling precise stopping at a desired position during inspection or maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a cross-sectional structural diagram of the utility model;

[0008] Figure 2This is a schematic diagram of the exploded structure of the encoder component;

[0009] Figure 3 A schematic diagram of the three-dimensional structure of the encoder component.

[0010] In the figure: 1. Encoder rotor; 2. Encoder stator; 3. Mounting base; 4. Motor end cover; 5. Support frame; 6. Motor rotor; 7. Motor shaft; 8. Motor stator; 9. Motor housing. DETAILED DESCRIPTION

[0011] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0012] See also Figure 1-3 The present invention provides a technical solution: a position sensor mounting structure for a pumping unit motor, comprising a motor housing 9, a motor stator 8, a motor rotor 6, and a motor shaft 7. A motor end cap 4 is installed at the end of the motor housing 9 to seal the motor housing 9. The motor stator 8 is fixedly mounted within the inner cavity of the motor housing 9. The motor rotor 6 is located in the middle of the motor stator 8. The motor shaft 7 axially penetrates the middle of the motor rotor 6. During operation, the motor shaft 7 rotates synchronously with the motor rotor 6. Steps are provided on the outer sides of both ends of the motor shaft 7, and roller bearings are mounted on the steps. The outer rings of the two roller bearings are fixedly mounted correspondingly to the motor housing 9 and the motor end cap 4.

[0013] An annular support frame 5 is provided between the outer side of the motor shaft 7 and the motor rotor 6, and a mounting seat 3 is concentrically installed on the inner side of the motor end cover 4. The mounting seat 3 is annular and has an annular groove on the inner side. A matching encoder stator 2 is inserted into the annular groove. The encoder stator 2 is arc-shaped. The encoder rotor 1 is concentrically installed on the side of the support frame 5. The encoder rotor 1 is a circular ring structure. The encoder rotor 1 and the encoder stator 2 are opposite to each other front and back and close to each other. The encoder rotor 1 and the encoder stator 2 constitute a magnetic ring encoder. The encoder assembly converts the position into an electrical signal through a magnetic sensitive element based on the magnetoelectric principle. According to the position electrical signal, the rotation angle of the motor rotor 6 can be accurately controlled, and the crank can be controlled to hover at the desired position to facilitate inspection and maintenance.

[0014] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A position sensor mounting structure for a pumping unit motor, comprising a motor housing (9), a motor stator (8), a motor rotor (6), and a motor shaft (7); a motor end cover (4) is mounted at the end of the motor housing (9) to achieve sealing; the motor stator (8) is fixedly mounted in the inner cavity of the motor housing (9); the motor rotor (6) is located in the middle of the motor stator (8); the motor shaft (7) axially penetrates the middle of the motor rotor (6); an annular support frame (5) is arranged between the outer side of the motor shaft (7) and the motor rotor (6); and the structure is characterized in that: A mounting seat (3) is concentrically mounted on the inner side of the motor end cover (4); the mounting seat (3) is annular and has an annular groove on the inner side; a matching encoder stator (2) is mounted in the annular groove; the encoder stator (2) is arc-shaped; an encoder rotor (1) is concentrically mounted on the side of the support frame (5); the encoder rotor (1) is a circular ring structure; the encoder rotor (1) and the encoder stator (2) are opposite to each other in front and back and close to each other.

2. The position sensor mounting structure of the oil pumping unit motor according to claim 1, characterized in that: Steps are provided on the outer sides of both ends of the motor shaft (7), and roller bearings are installed on the steps. The outer rings of the two roller bearings are fixedly installed corresponding to the motor housing (9) and the motor end cover (4).

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