Automatic detection device and method for motor rotor

Abstract

The present invention discloses an automatic detection device and method for a motor rotor, comprising a rotor mounting seat, a rotor positioning unit, and a rotor detection unit. The mounting seat is provided with a rotor driving device for rotating the rotor. The rotor mounting seat is provided on a mounting seat moving unit. The mounting seat moving unit is provided with a track. The mounting seat moves along the track under the drive of a first linear motor. A detection frame is provided at one end of the track. The rotor positioning unit and the rotor detection unit are provided on the detection frame. The rotor positioning unit and the distance sensor cooperate to move the rotor to the position to be tested and automatically determine the rotor diameter based on the position relationship. By recording the starting position and the ending position of the induced magnetic field, the magnetic steel position is automatically calculated based on the relationship between the starting position and the ending position of the magnetic field. Automatic all-round detection of the magnetic steel to be detected is achieved, further improving the efficiency of magnetic steel detection while simplifying the detection process while ensuring detection accuracy.

Description

Technical Field

[0001] The present invention relates to the field of rotor detection equipment, and in particular to an automatic detection device and an automatic detection method for a motor rotor. Background Art

[0002] A motor primarily consists of a rotor and a stator. It is a device that converts electrical energy into mechanical energy or vice versa. The motor rotor is the rotating component of the motor. The motor rotor includes a rotor body and magnetic plates. The rotor body is provided with magnetic plate mounting slots. Multiple magnetic plate mounting slots are provided at each end of the rotor body. The staggered magnetic plate mounting slots installed at one end of the rotor body are evenly distributed circumferentially around the rotor's rotation center. When assembling the motor rotor, the staff install the magnetic plates in the magnetic plate mounting slots in the forward direction. After the motor rotor is installed, the installation of the magnetic steel plates and the magnetic properties of the installed magnetic steel need to be inspected.

[0003] The existing technology of rotor magnet installation inspection requires workers to rely on visual inspection and experience to judge whether the magnets are installed in place and whether the magnet polarity is installed accurately. Manual judgment of whether the magnets are installed accurately is not only inefficient, but also prone to errors and low accuracy. Summary of the Invention

[0004] The present invention aims to solve the problems of low detection efficiency and low detection accuracy of the rotor detection method in the prior art, and provides a motor rotor automatic detection device and automatic detection method that is fully automated, accurate in detection, and highly efficient.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] An automatic detection device for a motor rotor comprises a rotor mounting seat, a rotor positioning unit, and a rotor detection unit. The mounting seat is provided with a rotor driving device for rotating the rotor. The rotor mounting seat is provided on a mounting seat moving unit. The mounting seat moving unit is provided with a track. The mounting seat moves along the track under the drive of a first linear motor. A detection frame is provided at one end of the track. The rotor positioning unit and the rotor detection unit are provided on the detection frame. The mounting seat is provided with a rotor clamping sleeve. The rotor is placed on the rotor clamping sleeve during detection. The other end of the track is an initial position. Before the detection begins, the mounting seat is in the initial position. The mounting seat moves along the track until the rotor positioning unit detects the rotor and stops. The position of the mounting seat at this time is the detection position. After the detection is completed, the mounting seat returns to the initial position. Rotors of different specifications and diameters can be installed on the mounting seat. During detection, the mounting seat moves along the track toward the detection frame. The rotor positioning unit and the rotor detection unit determine the rotor position and perform detection. The rotor detection station can be formed after the rotor production line to realize rotor detection automation and improve rotor production efficiency and yield rate.

[0007] Preferably, the rotor positioning unit includes a distance sensor disposed at one end of the track, with the sensor head of the distance sensor facing the other end of the track, and the sensing direction of the distance sensor parallel to the bottom surface of the track. The distance sensor is mounted on a sidewall of the mounting seat receiving slot and detects the distance between the mounting seat and the distance sensor when the mounting seat is in the detection position.

[0008] Preferably, the detection frame includes a vertical rail disposed on the side of one end of the track. The rotor detection unit includes a rotor position sensing unit and a rotor magnetic steel detection unit. The detection head of the rotor position sensing unit is disposed directly above one end of the track and facing the track. The rotor position sensing unit is connected to the top of the vertical rail. The rotor magnetic steel detection unit is driven by a second linear motor to move along the vertical rail. The rotor position sensing unit and the rotor magnetic steel detection unit are arranged in a staggered manner. The rotor polarity detection unit is positioned so as to not obstruct the sensing position between the rotor position sensing unit and the track.

[0009] Preferably, the vertical rail includes a first vertical rail arranged on a first vertical beam on one side of one end of the track and a second vertical rail arranged on a second vertical beam on the other side of one end of the track, the first vertical beam and the second vertical beam are both perpendicular to the plane where the rail is located, and the first vertical rail and the second vertical rail are symmetrically arranged along the track.

[0010] Preferably, the detection frame also includes a first crossbeam, one end of the first crossbeam is connected to the top of the first vertical beam, and the other end of the first crossbeam is connected to the top of the second vertical beam. The rotor position sensing unit includes an infrared sensor and an infrared sensor. The infrared sensor is arranged on the first crossbeam, and a boss is provided at one end of the guide rail. A mounting seat accommodating groove is formed between the lower surface of the boss and the bottom of the guide rail, and the infrared sensing device is arranged on the upper surface of the boss; the infrared sensor and the infrared sensor are arranged relative to each other.

[0011] Preferably, the detection frame also includes a second crossbeam, the two ends of which are respectively arranged in the first vertical rail and the second vertical rail, the second crossbeam is driven by a second linear motor to move along the first vertical rail and the second vertical rail, and the rotor magnetic steel detection unit is arranged on the second crossbeam.

[0012] Preferably, the rotor magnetic steel detection unit includes a first detection arm and a second detection arm, a first cross rail is provided on the side of the second cross beam facing the track direction, the first detection arm and the second detection arm are symmetrically arranged on the first cross rail along the axial center of the track, the first detection arm is driven to move along the first cross rail by a third linear motor, and the second detection arm is driven to move along the first cross rail by a fourth linear motor.

[0013] Preferably, the first detection arm is provided with a first induction slot, in which a magnetic field sensor and a first magnetic steel polarity sensor are provided, and the magnetic field sensor and the first magnetic induction polarity sensor are driven to move in the first induction slot by a first induction transport motor; the second detection arm is provided with a second induction slot, in which a second magnetic steel polarity sensor is provided, and the second magnetic steel polarity sensor is driven to move in the second induction slot by a second induction transport motor, and the first induction slot and the second induction slot are arranged opposite to each other.

[0014] A method for automatically detecting a motor rotor, used in an automatic rotor detection device described in this application, comprises the following steps:

[0015] Step S1: Move the mounting base with the rotor from the other end of the track to one end of the track until the rotor blocks the signal transmitted from the infrared sensor to the infrared sensor, and the distance detection unit detects the position of the mounting base when it stops to determine the rotor diameter R;

[0016] Step S2: adjusting the distance A=R+α between the first detection arm and the second detection arm according to the rotor diameter R, so that the first detection arm and the second detection arm are still symmetrical about the axial center of the track after adjustment, and α is the distance coefficient;

[0017] Step S3: The second horizontal beam moves downward from the top of the first vertical rail, records the starting position and the ending position of the induced magnetic field, and calculates the position of the magnetic steel based on the starting position and the ending position of the magnetic field;

[0018] Step S4: Move the second beam to the magnetic steel position, the rotor drive device controls the rotor to rotate, the magnetic field inductor and the magnetic steel polarity sensor simultaneously sense the magnetic field, record the detected magnetic field polarity and magnetic field strength, determine whether the magnetic field polarity is correct when the rotor rotates an integer number of circles, and determine whether the rotor magnetic field meets the threshold.

[0019] The distance coefficient α is the sum of the distances between the first detection arm and the second detection arm and the rotor. α is greater than 0, so that the distance between the magnetic steel sensing arm and the second detection arm is slightly larger than the rotor diameter. When the distance between the magnetic steel sensing arm and the second detection arm is adjusted to A, the initial position of the second beam is the top of the first vertical rail, recorded as point a. The second beam moves from the top to the bottom of the first vertical rail. The magnetic field inductor and the magnetic steel polarity sensor simultaneously sense the magnetic field. The height difference H1 between the magnetic field sensor and point a when the magnetic steel sensor senses the magnetic field and the height difference H2 between the magnetic field sensor and point a when the magnetic field disappears are recorded during the movement from top to bottom. The rotor magnetic steel height is obtained as H. When the rotor with detection is a single-layer magnetic steel rotor, the second beam moves to a position with a height of H2-H / 2 to perform magnetic steel polarity and magnetic force detection. When the rotor to be tested is a double-layer magnetic steel rotor, during testing, the second beam is first moved to the position of H2-H / 4 to detect the lower magnetic steel, and then the second beam is moved to the position of H1+H / 4 to detect the upper magnetic steel; when the rotor to be tested is a multi-layer magnetic steel rotor, the above rule can be used to analogize the overall height of the magnetic steel from top to bottom, and then the magnetic steel polarity and magnetic field strength can be detected layer by layer from bottom to top. After the test is completed, the second beam returns to the initial position, further improving the magnetic steel detection efficiency while simplifying the detection process while ensuring detection accuracy.

[0020] Preferably, step S4 of determining whether the magnetic field polarity is correct when the rotor rotates an integer number of times includes: recording an electrical signal of 1 when the magnetic steel polarity sensor senses an N-pole magnetic field, and recording an electrical signal of 0 when it senses an S-pole magnetic field. If the sum of the detected electrical signals after the rotor rotates an integer number of times is 0, the rotor polarity is correct; if it is not 0, the rotor polarity is incorrect. If a rotor polarity error is detected or the magnetic field strength is not within a threshold, an alarm is activated. The fully automatic detection method is more convenient for connection to the upstream and downstream pipelines.

[0021] Therefore, the present invention has the following beneficial effects: (1) The present application uses a rotor positioning unit and a distance sensor to move the rotor to the position to be tested and automatically determines the rotor diameter based on the position relationship. (2) The first detection arm and the second detection arm record the starting position and the ending position of the induced magnetic field, and automatically calculate the position of the magnetic steel based on the relationship between the starting position and the ending position of the magnetic field. (3) The magnetic steel polarity and magnetic field strength are detected layer by layer from bottom to top, realizing automatic and all-round detection of the magnetic steel to be tested, further improving the detection efficiency of the magnetic steel and simplifying the detection process while ensuring the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a motor rotor automatic detection device according to an embodiment of the present invention.

[0023] Figure 2 It is a structural schematic diagram of the first detection arm of the motor rotor automatic detection equipment according to one embodiment of the present invention.

[0024] Figure 3 It is a structural schematic diagram of the second detection arm of the motor rotor automatic detection equipment according to one embodiment of the present invention.

[0025] In the figure: 1, first linear motor 11, rotor clamping sleeve 12, rotor rotating power motor 2, track 21, boss 22, mounting seat accommodating groove 3, distance sensor 4, first crossbeam 41, infrared sensor 42, infrared light sensor 5, second crossbeam 51, first detection arm 510, first sensing slot 511, third linear motor 512, first inductor transport motor 513, magnetic field sensor 514, first magnetic steel polarity sensor 52, second detection arm 520, second sensing slot 521, fourth linear motor 522, second magnetic steel polarity sensor 523, second inductor transport motor 6, first vertical beam 61, first vertical rail 7, second vertical beam 8, rotor 9, magnetic steel. DETAILED DESCRIPTION

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0027] Example:

[0028] like Figure 1 The device shown is an automated device for detecting motor rotors, including a rotor mounting seat, a rotor positioning unit and a rotor detection unit. The mounting seat is provided with a rotor rotating power motor 12 for rotating the rotor. The rotor mounting seat is arranged on a mounting seat moving unit. The mounting seat moving unit is provided with a track 2. The mounting seat moves along the track 2 under the drive of a first linear motor 1. A detection frame is provided at one end of the track 2. The rotor positioning unit and the rotor detection unit are arranged on the detection frame; a rotor clamping sleeve 11 is provided on the mounting seat, and the rotor 8 is placed on the rotor clamping sleeve 11 during detection.

[0029] The rotor positioning unit includes a distance sensor 3 positioned at one end of track 2. The sensor head of the distance sensor 3 faces the other end of track 2, and the sensing direction is parallel to the bottom surface of track 2. The distance sensor 3 is mounted on the sidewall of the mounting base accommodating slot 22. The distance sensor 3 detects the distance between the mounting base and the distance sensor 3 when the mounting base is in the detection position.

[0030] The detection frame includes a vertical rail, a first horizontal beam 4 and a second horizontal beam 5. The vertical rail includes a first vertical rail 61 arranged on the first vertical beam 6 on one side of one end of the track 2 and a second vertical rail arranged on the second vertical beam 7 on the other side of one end of the track 2. The first vertical beam 6 and the second vertical beam 7 are both perpendicular to the plane where the rails are located, and the first vertical rail 61 and the second vertical rail are symmetrically arranged along the track 2.

[0031] One end of the first crossbeam 4 is connected to the top of the first vertical beam 6, and the other end of the first crossbeam 4 is connected to the top of the second vertical beam 7. The rotor position sensing unit includes an infrared sensor 41 and an infrared light sensor 42. The infrared sensor 41 is arranged on the first crossbeam 4. A boss 21 is provided at one end of the guide rail. A mounting seat accommodating groove 22 is formed between the lower surface of the boss 21 and the bottom of the guide rail. The infrared sensing device is arranged on the upper surface of the boss 21; the infrared sensor 41 and the infrared light sensor 42 are arranged opposite to each other.

[0032] Both ends of the second beam 5 are respectively arranged in the first vertical rail 61 and the second vertical rail. The second beam 5 is driven by the second linear motor to move along the first vertical rail 61 and the second vertical rail. The rotor magnetic steel detection unit is arranged on the second beam 5.

[0033] The rotor magnetic steel detection unit includes a first detection arm 51 and a second detection arm 52. A first cross rail is provided on the side of the second cross beam 5 facing the track 2. The first detection arm 51 and the second detection arm 52 are symmetrically arranged on the first cross rail along the axial center of the track 2. The first detection arm 51 is driven by the third linear motor 511 to move along the first cross rail, and the second detection arm 52 is driven by the fourth linear motor 521 to move along the first cross rail.

[0034] like Figure 2 The first detection arm 51 is provided with a first sensing slot 510, and a magnetic field sensor 513 and a first magnetic polarity sensor 514 are provided in the first sensing slot 510. The magnetic field sensor 513 and the first magnetic polarity sensor are driven by a first sensor transport motor 512 to move in the first sensing slot 510;

[0035] like Figure 3 The second detection arm 52 is shown as having a second sensing slot 520, in which a second magnetic steel polarity sensor 522 is provided. The second magnetic steel polarity sensor 522 is driven to move in the second sensing slot 520 by a second sensor transport motor 523. The first sensing slot 510 and the second sensing slot 520 are arranged opposite to each other.

[0036] The other end of track 2 is the initial position. Before the detection begins, the mounting seat is in the initial position. The mounting seat runs along track 2 until the rotor positioning unit detects the rotor and stops. At this time, the position of the mounting seat is the detection position. After the detection is completed, the mounting seat returns to the initial position. Rotors of different specifications and diameters can be installed on the mounting seat. During the detection, the mounting seat moves along track 2 toward the detection frame. The rotor positioning unit and the rotor detection unit determine the rotor position and perform detection. It is convenient to set it up after the rotor production line to form a rotor detection station, realize rotor detection automation, and improve rotor production efficiency and yield.

[0037] This embodiment also discloses a method for automatically detecting a motor rotor, which uses the above-mentioned rotor automatic detection device and includes the following steps:

[0038] Step S1: The mounting base on which the rotor is mounted is moved from the other end of the track 2 to the one end of the track 2 until the rotor blocks the signal transmitted from the infrared sensor 41 to the infrared light sensor 42, and the distance detection unit detects the position of the mounting base when it stops to determine the rotor diameter R;

[0039] Step S2: Adjust the spacing A=R+α between the first detection arm 51 and the second detection arm 52 according to the rotor diameter R. After adjustment, the first detection arm 51 and the second detection arm 52 remain symmetrical about the axial center of the track 2. α is a distance coefficient. The distance coefficient α is the sum of the distances between the first detection arm 51 and the second detection arm 52 and the rotor. α is greater than 0, so that the distance between the magnetic steel sensing arm and the second detection arm 52 is slightly larger than the rotor diameter.

[0040] Step S3: The second crossbeam 5 moves downward from the top of the first vertical rail 61, and the starting position and the ending position of the induced magnetic field are recorded. The position of the magnetic steel is calculated based on the starting position and the ending position of the magnetic field. Specifically, when the distance between the magnetic steel sensing arm and the second detection arm 52 is adjusted to A, the initial position of the second crossbeam 5 is the top of the first vertical rail 61, which is recorded as point a. The second crossbeam 5 moves from the top to the bottom of the first vertical rail 61, and the magnetic field inductor and the magnetic steel polarity sensor simultaneously sense the magnetic field. The height difference H1 between the magnetic field sensor 513 and point a when the magnetic steel sensor senses the magnetic field and the height difference H2 between the magnetic field sensor 513 and point a when the magnetic field disappears are recorded during the movement from top to bottom. The height of the rotor magnetic steel is obtained as H.

[0041] Step S4: Move the second crossbeam 5 to the position of the magnet 9. The rotor drive device controls the rotor to rotate. The magnetic field inductor and the magnet polarity sensor simultaneously sense the magnetic field, record the detected magnetic field polarity and magnetic field strength, and determine whether the magnetic field polarity is correct when the rotor rotates an integer number of revolutions, and determine whether the rotor magnetic field meets the threshold. Specifically, when the rotor to be tested is a single-layer magnet rotor, the second crossbeam 5 moves to a height of H2-H / 2 to detect the magnet polarity and magnetic force. When the rotor to be tested is a double-layer magnet rotor, the second crossbeam 5 is first moved to a position of H2-H / 4 to detect the lower magnet layer, and then to a position of H1+H / 4 to detect the upper magnet layer. When the rotor to be tested is a multi-layer magnet rotor, the above rule can be used to analogize the overall height of the magnet from top to bottom, and then the magnet polarity and magnetic field strength can be detected layer by layer from bottom to top.

[0042] After the detection is completed, the second beam 5, the rotor mounting seat, the first detection arm 51, and the second detection arm 52 all return to their initial positions, further improving the magnetic steel detection efficiency while simplifying the detection process while ensuring the detection accuracy.

[0043] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

[0044] Although this document frequently uses terms such as linear motor, track, inductor, inductor slot, and beam, the use of other terms is not excluded. These terms are used solely to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A motor rotor automatic detection device, characterized in that: The invention comprises a rotor mounting seat, a rotor positioning unit and a rotor detection unit, wherein the rotor detection unit comprises a rotor position sensing unit and a rotor magnetic steel detection unit, wherein the rotor magnetic steel detection unit comprises a first detection arm and a second detection arm, wherein the rotor mounting seat is provided with a rotor driving device for rotating the rotor, the rotor mounting seat is provided on a mounting seat moving unit, and a track is provided on the mounting seat moving unit, wherein the rotor mounting seat moves along the track under the drive of the first linear motor, and a detection frame is provided at one end of the track, wherein the detection frame comprises a vertical rail and a second cross beam, wherein the second cross beam moves from top to bottom along the vertical rail, and a second cross rail is provided on the second cross beam, the first detection arm and the second detection arm are relatively arranged on the second cross rail, the first detection arm is provided with a first sensing slot, and the second cross beam is provided with a second sensing slot. A magnetic field sensor and a first magnetic steel polarity sensor are provided in an induction slot, and the magnetic field sensor and the first magnetic induction polarity sensor move in the first induction slot. A second induction slot is provided on the second detection arm, and a second magnetic steel polarity sensor is provided in the second induction slot, and the second magnetic induction polarity sensor moves in the second induction slot. The rotor positioning unit and the rotor detection unit are arranged on the detection frame; a rotor clamping sleeve is provided on the rotor mounting seat, and the rotor is placed on the rotor clamping sleeve during detection. During detection, the distance between the first detection arm and the second detection arm is adjusted to the sum of the distances between the first detection arm and the second detection arm and the rotor plus the rotor diameter. If the rotor to be tested is a multi-layer magnetic steel, after detecting the overall height of the magnetic steel from top to bottom, the magnetic steel polarity and magnetic field strength are detected layer by layer from bottom to top.

2. The motor rotor automatic detection device according to claim 1, characterized in that: The rotor positioning unit includes a distance sensor arranged at one end of the track, the sensing head of the distance sensor is arranged toward the other end of the track, and the sensing direction of the distance sensor is parallel to the bottom surface of the track.

3. The motor rotor automatic detection device according to claim 1 or 2, characterized in that: The detection frame includes a vertical rail arranged on the side of one end of the track, the detection head of the rotor position sensing unit is arranged directly above the one end of the track and facing the track, and the rotor position sensing unit is connected to the top of the vertical rail; The rotor magnetic steel detection unit is driven by the second linear motor to move along the vertical rail, and the rotor position sensing unit and the rotor magnetic steel detection unit are staggered.

4. The motor rotor automatic detection device according to claim 3, characterized in that: The vertical rail includes a first vertical rail arranged on a first vertical beam on one side of one end of the rail and a second vertical rail arranged on a second vertical beam on the other side of one end of the rail. The first vertical beam and the second vertical beam are both perpendicular to the plane where the rail is located, and the first vertical rail and the second vertical rail are symmetrically arranged along the rail.

5. The motor rotor automatic detection device according to claim 4, characterized in that: The detection frame also includes a first crossbeam, one end of the first crossbeam is connected to the top of the first vertical beam, and the other end of the first crossbeam is connected to the top of the second vertical beam. The rotor position sensing unit includes an infrared sensor and an infrared sensor. The infrared sensor is arranged on the first crossbeam, and a boss is provided at one end of the track. A mounting seat accommodating groove is formed between the lower surface of the boss and the bottom of the track. The infrared sensor is arranged on the upper surface of the boss; the infrared sensor and the infrared sensor are arranged relative to each other.

6. The motor rotor automatic detection device according to claim 5, characterized in that: The detection frame also includes a second crossbeam, the two ends of which are respectively arranged in the first vertical rail and the second vertical rail. The second crossbeam is driven by a second linear motor to move along the first vertical rail and the second vertical rail, and the rotor magnetic steel detection unit is arranged on the second crossbeam.

7. The motor rotor automatic detection device according to claim 6, characterized in that: A first transverse rail is provided on the side of the second transverse beam facing the track direction, and the first detection arm and the second detection arm are symmetrically arranged on the first transverse rail along the axial center of the track. The first detection arm is driven by a third linear motor to move along the first transverse rail, and the second detection arm is driven by a fourth linear motor to move along the first transverse rail.

8. The motor rotor automatic detection device according to claim 7, characterized in that: The magnetic field sensor and the first magnetic polarity sensor are driven to move in the first induction slot by the first induction transport motor; the second magnetic polarity sensor is driven to move in the second induction slot by the second induction transport motor, and the first induction slot and the second induction slot are arranged opposite to each other.

9. A method for automatic detection of a motor rotor, characterized in that: The motor rotor automatic detection device according to any one of claims 1 to 8 comprises the following steps: Step S1: Move the rotor mounting base with the rotor mounted thereon from the other end of the track to one end of the track until the rotor blocks the signal transmitted from the infrared sensor to the infrared sensor, and the distance detection unit detects the position of the rotor mounting base when it stops to determine the rotor diameter R; Step S2: Adjust the distance A=R+α between the first detection arm and the second detection arm according to the rotor diameter R. The initial position of the second crossbeam is the top of the first vertical rail, which is marked as point a. After adjustment, the first detection arm and the second detection arm are still symmetrical about the axial center of the rail. α is the distance coefficient. Step S3: The second horizontal beam moves downward from the top of the first vertical rail, records the starting position and the ending position of the induced magnetic field, and calculates the position of the magnetic steel based on the starting position and the ending position of the magnetic field; Step S4: The second crossbeam is moved to the magnetic steel position. The rotor drive device controls the rotor to rotate. The magnetic field inductor and the magnetic steel polarity sensor simultaneously sense the magnetic field, record the detected magnetic field polarity and magnetic field strength, and determine whether the magnetic field polarity is correct when the rotor rotates an integer number of revolutions. It is also determined whether the rotor magnetic field meets the threshold value. When the second horizontal beam moves downward from the top of the first vertical rail, the height difference between the magnetic field sensor and point a when the magnetic field sensor senses the magnetic field is H1, and the height difference between the magnetic field sensor and point a when the magnetic field disappears is H2, and the height of the rotor magnetic steel is H. When the rotor to be tested is a single-layer magnetic steel rotor, the second crossbeam moves to a height of H2-H / 2 to detect the magnetic steel polarity and magnetism. When the rotor to be tested is a double-layer magnetic steel rotor, the second crossbeam is first moved to a position of H2-H / 4 to detect the lower magnetic steel, and then the second crossbeam is moved to a position of H1+H / 4 to detect the upper magnetic steel.

10. The method for automatic detection of a motor rotor according to claim 9, characterized in that: The step S4 of judging whether the magnetic field polarity is correct when the rotor rotates an integer number of times includes: the electrical signal sensed by the magnetic steel polarity sensor when the N-pole magnetic field is sensed is recorded as 1, and the electrical signal sensed when the S-pole magnetic field is sensed is recorded as 0. If the sum of the electrical signals detected after the rotor rotates an integer number of times is 0, the rotor polarity is correct; if it is not 0, the rotor polarity is incorrect.

Images