Device for measuring output angle deviation of permanent magnet alternating current servo motor unit

Abstract

The utility model discloses a permanent magnet alternating current servo motor unit output angle deviation measuring device comprising a connecting flange, one end of the connecting flange is connected with a permanent magnet alternating current servo motor unit, and the other end of the connecting flange is internally provided with an angle measuring rotary transformer; the angle measuring rotary transformer comprises a rotary transformer rotor and a rotary transformer stator, the rotary transformer stator is connected with an outer fixing part, and the outer fixing part is connected with a connecting flange; the rotary transformer rotor is rotationally mounted in the rotary transformer stator; the other end of the rotating shaft is connected with an output shaft of the permanent magnet alternating current servo motor unit. According to the device, the rotating angle of the output shaft of the permanent magnet alternating-current servo motor unit is transmitted to the angle measuring rotary transformer through the rotating shaft, the detection result and the angle detected by the built-in sensor of the permanent magnet alternating-current servo motor unit are analyzed to obtain a deviation, and then the deviation is adjusted; therefore, the permanent magnet alternating current servo motor unit can operate stably and accurately.

Description

Technical Field

[0001] The utility model belongs to the technical field of motor performance detection devices, in particular to a permanent magnet AC servo motor unit output angle deviation measuring device. Background Art

[0002] Permanent magnet AC servo motor units are generally composed of permanent magnet AC servo motors, reducers, sensors and other components. They use permanent magnet materials to generate magnetic fields, and generate rotating magnetic fields through the stator windings of AC motors, thereby driving the motor rotor to rotate. The speed and direction of the motor are controlled by the controller, and the use of sensors can monitor the position and speed of the motor in real time to achieve precise control; the servo control system of the permanent magnet AC servo motor unit has the advantages of high precision, good reliability, smooth torque and speed, fast response, and more precise positioning. In recent years, there have been more and more research and practical applications related to permanent magnet AC servo motor units. The permanent magnet AC servo motor unit itself has a stable structure, is sturdy and durable, and can accurately and timely transmit key parameters such as torque, speed, angle, etc. to the core components of the mechanism according to the requirements of the control instructions. The permanent magnet AC servo motor unit selects the appropriate control mode and reasonably adjusts the servo gain parameters, which can drive the motor quickly and accurately and maximize the mechanical performance of the unit.

[0003] At present, the angle detection of the motor rotor relative to the motor stator in the permanent magnet AC servo motor unit is carried out through the built-in sensor in the unit, and the detected position information is transmitted to the control computer for servo drive; the position information detected by the built-in sensor is relatively accurate when the permanent magnet AC servo motor unit is only connected to a single motor. However, when other load devices (such as reducers, gearboxes, etc.) are connected to the permanent magnet AC servo motor unit, there is a certain deviation between the angle signal measured by the built-in sensor and the mechanical angle value actually rotated by the unit output shaft, which in turn affects the precise driving of the device by the permanent magnet AC servo motor unit. Utility Model Content

[0004] In order to solve the problem in the prior art that, under the influence of the external connection device of the permanent magnet AC servo motor unit, the angle signal of the permanent magnet AC servo motor rotor detected by the built-in sensor of the permanent magnet AC servo motor unit relative to the motor stator and the mechanical angle value actually rotated by the unit output shaft deviates from the problem, the utility model provides a permanent magnet AC servo motor unit output angle deviation measuring device.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for measuring the output angle deviation of a permanent magnet AC servo motor unit comprises a connecting flange, one end of which is connected to the end surface of the output shaft of the permanent magnet AC servo motor unit, and the other end of which is provided with an angle measuring rotary transformer;

[0007] The angle measuring rotary transformer comprises a rotary transformer rotor and a rotary transformer stator, the rotary transformer stator is connected to an external fixing part, and the external fixing part is connected to the connecting flange;

[0008] The rotary transformer rotor is rotatably mounted in the rotary transformer stator; one end of a rotating shaft is connected to the rotary transformer rotor, the rotating shaft is rotatably mounted in the connecting flange, and the other end of the rotating shaft is connected to the output shaft of the permanent magnet AC servo motor unit.

[0009] Preferably, the rotary transformer rotor is provided with an inner stop hole, one end of the rotating shaft is installed in the inner stop hole, an inner fixing portion is installed in the inner stop hole, and the inner fixing portion is connected to the rotating shaft.

[0010] Preferably, the inner stop hole and the rotating shaft are installed with clearance fit.

[0011] Preferably, the internal fixing portion is an internal connecting threaded rod, a first threaded hole is provided on the end surface of the rotating shaft at a position corresponding to the internal stop hole, and the first threaded hole and the internal stop hole are commonly connected to the internal connecting threaded rod.

[0012] Preferably, a bearing is sleeved on the rotating shaft, a bearing hole is provided in the connecting flange, and the bearing is installed in the bearing hole;

[0013] An end cover is sleeved on the rotating shaft, and the end cover is installed in the connecting flange, and a side end surface on one side of the end cover is in contact with a side end surface on one side of the bearing.

[0014] Preferably, a receiving groove is provided on the bearing between the bearing and the end cover, a bearing retaining ring is installed in the receiving groove, one end face of the bearing retaining ring is fitted to the side end face of the bearing, and the other end face of the bearing retaining ring is fitted to the side end face of the end cover relative to the bearing.

[0015] Preferably, a connector is provided on the end of the rotating shaft opposite to the permanent magnet AC servo motor unit, the connector is connected to the output shaft of the permanent magnet AC servo motor unit, a second threaded hole is provided on the connector, a keyway is provided at a position corresponding to the second threaded hole on the output shaft of the permanent magnet AC servo motor unit, a key is installed in the keyway, a fastening screw is installed in the second threaded hole, and the inner end of the fastening screw is tightly against the outer end face of the key.

[0016] Preferably, the external fixing portion is an external connecting threaded rod, a connecting platform is provided on the outer wall of the rotating transformer stator, a third threaded hole is provided on the connecting platform, a fourth threaded hole is provided on the end surface of the connecting flange at a position corresponding to the third threaded hole, and the external connecting threaded rod is screwed into the third threaded hole corresponding to the third threaded hole.

[0017] Preferably, the angle measuring rotary transformer is externally connected to an angle indicator.

[0018] Preferably, a fifth threaded hole is provided on the end face of the output shaft of the permanent magnet AC servo motor unit, a sixth threaded hole is provided on the connecting flange at a position corresponding to the fifth threaded hole, and a fixed threaded rod is installed in the fifth threaded hole and the corresponding sixth threaded hole.

[0019] Compared with the prior art, the utility model has the following beneficial technical effects:

[0020] The utility model discloses a device for measuring the output angle deviation of a permanent magnet AC servo motor unit. In the device, a connecting flange connects an angle measuring rotary transformer with a permanent magnet AC servo motor unit, so that the angle measuring rotary transformer measures the angle deviation of an output shaft of the permanent magnet AC servo motor unit. A rotary transformer rotor in the angle measuring rotary transformer is connected to the output shaft of the permanent magnet AC servo motor unit through a rotating shaft. The output shaft of the permanent magnet AC servo motor unit rotates, and the rotation angle of the output shaft of the permanent magnet AC servo motor unit is transmitted to the angle measuring rotary transformer through the rotating shaft. The obtained detection result is analyzed with the angle detected by a built-in sensor of the permanent magnet AC servo motor unit to obtain the deviation between the two. The operator adjusts the parameters of the servo control unit so that the permanent magnet AC servo motor unit can operate stably and accurately.

[0021] Furthermore, the device connects the inner stop hole provided on the rotary transformer rotor with the rotating shaft through an inner connecting threaded rod, and the inner stop hole and the rotating shaft 3 are installed with clearance fit, so that it rotates synchronously with the rotating shaft, thereby increasing the operating stability of the device and avoiding affecting the detection results of the device; at the same time, the inner connecting threaded rod and the inner stop hole on the rotary transformer rotor and the first threaded hole on the end of the rotating shaft are all connected by threads, which is convenient for the staff to quickly disassemble the device and facilitate the maintenance of the device.

[0022] Furthermore, in the device, a bearing is sleeved on the rotating shaft, and the bearing is used to reduce the friction between the connecting flange and the rotating shaft, thereby improving the accuracy of the device's measurement data; at the same time, an end cover is also sleeved on the rotating shaft, and the end cover is connected to the connecting flange. The bearing is fixed in the bearing hole through the end cover to prevent the bearing from detaching from the bearing hole during use of the device, thereby affecting the stability of the device's operation.

[0023] Furthermore, a bearing retaining ring is provided on the rotating shaft between the end cover and the bearing in the device, and the movement of the bearing retaining ring is limited by the end cover and the bearing, and then the axial movement of the rotating shaft is fixed by the bearing retaining ring to prevent the axial movement of the rotating shaft in the connecting flange, thereby increasing the stability of the device operation.

[0024] Furthermore, in the present device, the connector provided on the rotating shaft is connected to the output shaft of the permanent magnet AC servo motor unit by means of a fastening screw and a key, so that the rotating shaft and the output shaft of the permanent magnet AC servo motor unit rotate synchronously, thereby avoiding a rotation angle deviation between the rotating shaft and the output shaft of the permanent magnet AC servo motor unit during the operation of the device, which affects the accuracy of the measurement data of the device.

[0025] Furthermore, in the present device, the stator of the rotary transformer is connected to the connecting flange via an external fixing part, which is an external connecting threaded rod. The stator of the rotary transformer is fixed to the connecting flange via the external connecting threaded rod, thereby preventing the stator of the rotary transformer from moving on the connecting flange, thereby preventing the angle measuring rotary transformer from detecting the rotation angle of the output shaft of the permanent magnet AC servo motor unit, and improving the stability of the measuring structure.

[0026] Furthermore, the device is externally connected to an angle indicator on the angle measuring rotary transformer, which can display the current rotation angle of the output shaft of the permanent magnet AC servo motor unit, so that the staff can intuitively understand the deviation between the angle signal detected by the built-in sensor of the permanent magnet AC servo motor unit and the angle of rotation of the output shaft detected by the angle deviation measuring device, and then adjust the rotation angle of the output shaft of the permanent magnet AC servo motor unit according to the deviation.

[0027] Furthermore, in the device, the permanent magnet AC servo motor unit and the connecting flange are fixed by means of a fixed threaded rod, and the connecting flange is fixed to the permanent magnet AC servo motor unit by connecting the threaded rod, which is convenient for installation and later maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The utility model provides a structural schematic diagram of a device for measuring output angle deviation of a permanent magnet AC servo motor unit.

[0029] In the attached figure: 1. permanent magnet AC servo motor unit; 2. connecting flange; 3. rotating shaft; 4. bearing; 5. sleeve; 6. end cover; 7. retaining ring; 8. rotary transformer rotor; 9. rotary transformer stator. DETAILED DESCRIPTION

[0030] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0036] See also Figure 1 The utility model discloses a device for measuring the output angle deviation of a permanent magnet AC servo motor unit, the device comprises a connecting flange 2, the left end of the connecting flange 2 is connected to the end surface of the output shaft of the permanent magnet AC servo motor unit 1, and the right end of the connecting flange 2 is provided with an angle measuring rotary transformer;

[0037] The angle measuring rotary transformer comprises a rotary transformer rotor 8 and a rotary transformer stator 9. An external fixing part is arranged on the outer wall of the rotary transformer stator 9, and the external fixing part is connected to the flange 2.

[0038] The rotary transformer rotor 8 is rotatably installed in the rotary transformer stator 9; the rotary transformer rotor 8 is connected to one end of the rotating shaft 3, the rotating shaft 3 is rotatably installed in the connecting flange 2, and the other end of the rotating shaft 3 is connected to the output shaft of the permanent magnet AC servo motor unit 1. In this device, the rotation angle of the output shaft of the permanent magnet AC servo motor unit 1 is transmitted to the angle measuring rotary transformer through the rotating shaft 3, and then the deviation of the angle signal of the permanent magnet AC servo motor unit 1 rotor relative to the stator winding and the mechanical angle value of the actual unit output shaft after the permanent magnet AC servo motor unit 1 is connected to the device is accurately detected, and then the parameters of the servo control unit are adjusted by the operator, so that the permanent magnet AC servo motor unit 1 can operate stably and accurately. Among them, the rotary transformer rotor 8 obtains an angle data every 10° rotation in the rotary transformer stator 9; and in the measurement process, the angle deviation of the same angle position is measured by detecting 3 times at the position, and the angle data of the 3 measurements are averaged, and the average value calculated is used as the relative true value of the angle deviation.

[0039] See also Figure 1 An inner stop hole is arranged on the right end face of the rotary transformer rotor 8 along its axial direction, and the left side of the inner stop hole passes through the left end face of the rotary transformer rotor 8, and the right end head of the rotating shaft 3 is inserted into the inner stop hole, and the right end head of the rotating shaft 3 and the inner stop hole are installed with clearance fit, and an inner fixing part is arranged in the inner stop hole, and the inner fixing part is connected to the rotating shaft 3, wherein the inner fixing part is an inner connecting threaded rod, and a first threaded hole is arranged on the right end face of the rotating shaft 3 at a position corresponding to the inner stop hole, and the inner connecting threaded rod is installed together with the first threaded hole and the inner stop hole, and the rotating shaft 3 and the rotary transformer rotor 8 are connected together through the inner connecting threaded rod, so that the rotating shaft 3 and the rotary transformer rotor 8 rotate synchronously, thereby increasing the operating stability of the device and avoiding affecting the detection result of the device.

[0040] See also Figure 1Two bearings 4 are sleeved on the rotating shaft 3, and a sleeve 5 is arranged between the two bearings 4. The two bearings 4 are separated by the sleeve 5. A bearing hole is arranged in the connecting flange 2, and the two bearings 4 are installed in the bearing hole. One end of one of the bearings 4 is in contact with the left side wall of the bearing hole, and one end face of the other bearing 4 is located at the position of the bearing hole opening. The friction between the connecting flange 2 and the rotating shaft 3 is reduced by the bearing 4, and the accuracy of the measurement data of the device is improved; an end cover 6 is sleeved on the rotating shaft 3, and the end cover 6 is connected to the inner wall of the connecting flange 2 at the position of the bearing hole opening, and the left end face of the end cover 6 is in contact with the right end face of the bearing 4 (close to the right end head of the rotating shaft 3). The bearing 4 is fixed in the bearing hole by the cooperation of the end cover 6 and the sleeve 5, so as to prevent the bearing 4 from detaching from the bearing hole during use of the device, thereby affecting the stability of the operation of the device.

[0041] See also Figure 1 A receiving groove is provided on the outer wall of the rotating shaft 3, near its right end, and between the bearing 4 and the end cover 6. The receiving groove is circumferentially arranged along the outer wall of the rotating shaft 3. A bearing retaining ring 7 is installed in the receiving groove. The left end face of the bearing retaining ring 7 is fitted to the right end face of the bearing 4 located at its right end, and the right end face of the bearing retaining ring 7 is fitted to the left end face of the end cover 6. The axial movement of the rotating shaft 3 is fixed by the bearing retaining ring 7 to prevent the axial movement of the rotating shaft 3 in the connecting flange 2, thereby increasing the stability of the device operation.

[0042] See also Figure 1 A connector is provided on the end of the rotating shaft 3 relative to the permanent magnet AC servo motor unit 1, and the left end of the connector is connected to the output shaft of the permanent magnet AC servo motor unit 1. A second threaded hole is provided on the outer wall of the connector along its radial direction, and a keyway is provided at a position corresponding to the fixing hole on the output shaft of the permanent magnet AC servo motor unit 1, and a key is installed in the keyway. A fastening screw is installed in the second threaded hole, and the inner end of the fastening screw is close to the outer end surface of the key. The left end of the rotating shaft 3 and the right end of the output shaft of the permanent magnet AC servo motor unit 1 are connected together through the cooperation of the fastening screw and the key, so as to avoid the deviation of the rotation angle between the rotating shaft 3 and the output shaft of the permanent magnet AC servo motor unit 1 during the operation of the device, which affects the accuracy of the measurement data of the device, increases the stability of the connection between the rotating shaft 3 and the output shaft of the permanent magnet AC servo motor unit 1, and the connection can be disassembled, which is convenient for replacement after the parts are damaged.

[0043] See also Figure 1The first connecting part is an external connecting threaded rod. A plurality of connecting platforms are arranged at equal intervals on the outer wall of the rotary transformer stator 9 around the rotary transformer stator 9. The distance from the side end face of each connecting platform to the side end face of the rotary transformer stator 9 is the same. A third threaded hole penetrating the left end face thereof is arranged on the right end face of each connecting platform. A plurality of fourth threaded holes are arranged at positions corresponding to the third threaded holes on the right end face of the connecting flange 2, and the third threaded holes correspond to the fourth threaded holes one by one. An external connecting threaded rod is screwed into the corresponding third threaded holes and the fourth threaded holes. The rotary transformer stator 9 is fixed to the connecting flange 2 by the external connecting threaded rod, thereby preventing the rotary transformer stator 9 from moving on the connecting flange 2, affecting the detection of the rotation angle of the output shaft in the permanent magnet AC servo motor unit 1 by the angle measuring rotary transformer, and improving the stability of the measuring structure.

[0044] Furthermore, an angle indicator is externally connected to the angle measuring rotary transformer, and the angle indicator is electrically connected to the angle measuring rotary transformer. The angle indicator is used to display the current output shaft rotation angle detection in the permanent magnet AC servo motor unit 1, so that the staff can intuitively understand the deviation between the angle signal detected by the built-in sensor of the permanent magnet AC servo motor unit 1 and the output shaft rotation angle detected by the angle deviation measuring device, and then adjust the rotation angle of the output shaft of the permanent magnet AC servo motor unit 1 according to the deviation angle.

[0045] Furthermore, a fifth threaded hole is provided on the end face of the output shaft of the permanent magnet AC servo motor unit 1, and a sixth threaded hole is provided on the left end face of the connecting flange 2 at a position corresponding to the fifth threaded hole. Fixed threaded rods are installed in the fifth threaded hole and the corresponding sixth threaded hole. The connecting flange 2 is fixed to the permanent magnet AC servo motor unit 1 by connecting the threaded rods, which is convenient for installation and later maintenance.

[0046] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0047] In addition, it should be understood that although this specification is described in accordance with the implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should take the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the utility model, and cannot be used to limit the protection scope of the utility model. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the utility model shall fall within the protection scope of the claims of the utility model.

Claims

1. A device for measuring output angle deviation of a permanent magnet AC servo motor unit, characterized in that: It comprises a connecting flange (2), one end of which is connected to the end surface of the output shaft of the permanent magnet AC servo motor unit (1), and the other end of which is provided with an angle measuring rotary transformer; The angle measuring rotary transformer comprises a rotary transformer rotor (8) and a rotary transformer stator (9), the rotary transformer stator (9) being connected to an external fixing portion, and the external fixing portion being connected to the connecting flange (2); The rotary transformer rotor (8) is rotatably mounted in the rotary transformer stator (9); one end of a rotating shaft (3) is connected to the rotary transformer rotor (8); the rotating shaft (3) is rotatably mounted in the connecting flange (2), and the other end of the rotating shaft (3) is connected to the output shaft of the permanent magnet AC servo motor unit (1).

2. The output angle deviation measuring device of a permanent magnet AC servo motor unit according to claim 1 is characterized in that: The rotary transformer rotor (8) is provided with an inner stop hole, one end of the rotating shaft (3) is installed in the inner stop hole, an inner fixing portion is installed in the inner stop hole, and the inner fixing portion is connected to the rotating shaft (3).

3. The device for measuring output angle deviation of a permanent magnet AC servo motor unit according to claim 2, characterized in that: The inner stop hole and the rotating shaft (3) are installed with clearance fit.

4. The device for measuring output angle deviation of a permanent magnet AC servo motor unit according to claim 3, characterized in that: The internal fixing portion is an internal connecting threaded rod, a first threaded hole is arranged on the end surface of the rotating shaft (3) at a position corresponding to the internal stop hole, and the first threaded hole and the internal stop hole are connected to the internal connecting threaded rod.

5. The device for measuring output angle deviation of a permanent magnet AC servo motor unit according to claim 2, characterized in that: The rotating shaft (3) is sleeved with a bearing (4), the connecting flange (2) is provided with a bearing hole, and the bearing (4) is installed in the bearing hole; The rotating shaft (3) is sleeved with an end cover (6), the end cover (6) is installed in the connecting flange (2), and the side end surface of one side of the end cover (6) is in contact with the side end surface of one side of the bearing (4).

6. The device for measuring output angle deviation of a permanent magnet AC servo motor unit according to claim 5, characterized in that: The bearing (4) is provided with a receiving groove at a position between the bearing (4) and the end cover (6), and a bearing retaining ring (7) is installed in the receiving groove. One end surface of the bearing retaining ring (7) is in contact with the side end surface of the bearing (4), and the other end surface of the bearing retaining ring (7) is in contact with the side end surface of the end cover (6) relative to the bearing (4).

7. The device for measuring output angle deviation of a permanent magnet AC servo motor unit according to claim 1, characterized in that: A connector is provided on the end of the rotating shaft (3) relative to the permanent magnet AC servo motor unit (1), and the connector is connected to the output shaft of the permanent magnet AC servo motor unit (1). A second threaded hole is provided on the connector, and a keyway is provided at a position corresponding to the second threaded hole on the output shaft of the permanent magnet AC servo motor unit (1), a key is installed in the keyway, and a fastening screw is installed in the second threaded hole, and the inner end of the fastening screw is tightly attached to the outer end surface of the key.

8. The device for measuring output angle deviation of a permanent magnet AC servo motor unit according to claim 1, characterized in that: The external fixing part is an external connecting threaded rod, a connecting platform is provided on the outer wall of the rotary transformer stator (9), a third threaded hole is provided on the connecting platform, a fourth threaded hole is provided on the end surface of the connecting flange (2) at a position corresponding to the third threaded hole, and the external connecting threaded rod is screwed into the corresponding third threaded hole.

9. The device for measuring output angle deviation of a permanent magnet AC servo motor unit according to claim 1, characterized in that: The angle measuring rotary transformer is externally connected with an angle indicator.

10. The device for measuring output angle deviation of a permanent magnet AC servo motor unit according to claim 1, characterized in that: The permanent magnet AC servo motor unit (1) is provided with a fifth threaded hole on the end face of the output shaft, the connecting flange (2) is provided with a sixth threaded hole at a position corresponding to the fifth threaded hole, and a fixed threaded rod is installed in the fifth threaded hole and the corresponding sixth threaded hole.

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