Vertical Motor Magnetic Field Center Measuring Tool

Abstract

The vertical motor magnetic field center measuring tool of the present invention includes a bracket. A digital display depth gauge is fixedly connected to the upper part of the bracket, and a first measuring rod is fixedly connected to the lower part. The scale frame of the digital display depth gauge is fixedly connected to the bracket, and the lower end of its measuring rod is connected to a second measuring rod. The first measuring rod and the second measuring rod are arranged in parallel, and the distance between the measuring heads at the free ends of the first measuring rod and the second measuring rod can be changed. The purpose of the present invention is to provide a vertical motor magnetic field center measuring tool to directly measure the height difference between the stator and the rotor, so as to reduce the requirements for the measurer, improve the measurement accuracy, and at the same time be applicable to various situations to ensure the accuracy of the measured value.

Description

Technical Field

[0001] The invention belongs to the technical field of water conservancy and hydropower, and particularly relates to a measuring tool for the magnetic field center of a vertical motor. Background Art

[0002] The magnetic field center of a vertical motor refers to the relative position between the magnetic field center of the stator and the magnetic field center of the rotor. As Figure 5 shown, during the unit installation process, before the stator and rotor are assembled together, the effective length Sd of the stator core, the distance hd from the top to the upper plane, the effective length Sz of the rotor core, and the distance hz from the top of the rotor pole to the upper plane of the yoke are measured respectively. Then, the distance Hd from the upper plane of the stator to the magnetic field center of the stator core and the distance Hz from the upper plane of the rotor yoke to the magnetic field center of the pole are calculated. After the stator and rotor are assembled and adjusted, the relative distance from the upper plane of the stator to the upper plane of the rotor yoke can be measured: He = Hd - Hz, that is, the magnetic field center coincidence position. And according to Article 3 of Clause 3.3.7 of the "Code for Installation and Acceptance of Pumping Stations" (SL317-2015), after the unit axis is adjusted, the installation elevation of the stator should be checked according to the magnetic field center, and the average center line of the stator core should be preferably higher than the average production center line of the rotor poles, and the height difference should be -0.15% to +0.5% of the effective length of the stator core. During the actual installation process, the magnetic field center value Hp measured by the relative height difference method should meet the requirement of He - 0.15%Sd ≤ Hp ≤ He + 0.5%Sd.

[0003] However, affected by the unevenness of the upper plane of the stator and the upper plane of the rotor yoke and the guiding error of the spirit level, the measured and calculated values have large errors and often cannot correctly reflect the deviation of the actual magnetic field center. In addition, if the upper frame has been installed in place, this method is more difficult to implement and ensure the accuracy of the measurement. Therefore, the "divider" method is often used on-site for the measurement method of the magnetic field center. An adjustable "h"-shaped ruler is made of two stainless steel electrodes, and the height differences between the stator and rotor cores and the upper end surfaces are measured at the upper and lower air gaps of the motor to obtain the multi-pole average value. Although this method is the multi-pole average value, when measuring, the "h"-shaped ruler is first calibrated on a plane so that the two measuring feet are on the same measuring plane, and then the height differences between the tops of the stator and rotor poles are measured through the air gap of the motor. After taking out the "h"-shaped ruler, the height difference between the two measuring planes of the "h"-shaped ruler feet is measured with a depth vernier caliper or a triple-purpose vernier caliper to obtain the height difference at this point. However, during the measurement process, affected by factors such as the contact condition of the measuring surface, the perpendicularity of the "h"-ruler, and the measurement error when indirectly measuring the height difference with a caliper, the requirements for the measurer are high when using this measuring tool, the measurement accuracy is low, and the accuracy of the measured value is low. Summary of the Invention

[0004] The purpose of the invention is to provide a measuring tool for the magnetic field center of a vertical motor to directly measure the height difference between the stator and the rotor, so as to reduce the requirements for the measurer, improve the measurement accuracy, and at the same time be applicable to various situations to ensure the accuracy of the measured value.

[0005] The present invention is realized through the following technical solutions:

[0006] A measuring tool for the magnetic field center of a vertical motor, comprising a bracket. A digital display depth gauge is fixedly connected to the upper part of the bracket, and a first measuring rod is fixedly connected to the lower part. The scale frame of the digital display depth gauge is fixedly connected to the bracket, and the lower end of its measuring rod is connected to a second measuring rod. The first measuring rod and the second measuring rod are arranged in parallel, and the distance between the measuring heads at the free ends of the first measuring rod and the second measuring rod can be changed.

[0007] Further, an "L"-shaped probe A is fixedly connected to the free end of the first measuring rod, and an "L"-shaped probe B is fixedly connected to the free end of the second measuring rod. The lower end of the measuring rod passes through the bracket and is rotatably connected to the upper end of the second measuring rod.

[0008] Further, a through hole is provided along the length of the first measuring rod, the second measuring rod is inserted into the through hole, and the probe A is arranged outside the through hole.

[0009] Further, the bracket includes a support plate and a U-shaped fixing plate fixed to the lower part of the support plate. The digital display depth gauge is fixedly connected to the support plate through a locking frame. The lower end of the measuring rod passes through the support plate and is connected to the upper end of the second measuring rod through a rotating device. The first measuring rod is fixedly connected to the lower surface of the fixing plate.

[0010] Further, the rotating device includes an upper fixing seat and a lower fixing seat. The upper fixing seat is fixedly connected to the lower end of the measuring rod, and the lower fixing seat is fixedly connected to the upper end of the second measuring rod. The measuring rod and the second measuring rod are coaxially arranged. The upper fixing seat and the lower fixing seat are rotatably connected through a rotating shaft. The lower end of the rotating shaft is fixedly connected to the lower fixing seat, and the upper end passes through the top of the upper fixing seat and is fixedly connected with a limiting block. A compression spring is sleeved on the shaft body of the rotating shaft between the limiting block and the upper fixing seat.

[0011] Further, the locking frame includes a clamping plate with an "n"-shaped cross section. A notch for the digital display depth gauge to expose is provided in the middle of the clamping plate, and a tightening bolt is threadedly connected to the opposite side of the notch.

[0012] Further, a spirit level bubble is also fixedly connected to the support plate.

[0013] Further, an LED lighting lamp is fixedly connected to the outer wall of the first measuring rod, a power supply is fixedly connected to the bracket, and the LED lighting lamp is electrically connected to the power supply.

[0014] The beneficial effects of the present invention are as follows;

[0015] 1. The first measuring rod in the measuring tool adopts a hollow structure, and the second measuring rod passes through the first measuring rod for application, which not only ensures the rigidity of the measuring rod but also reduces the volume of the measuring tool.

[0016] 2. The measuring heads at the ends of the first measuring rod and the second measuring rod are both made in an "L" shape, and the second measuring rod rotates 180 degrees. During the measurement process, the distance between the two measuring feet of the front measuring claw can be adjusted according to the size of the air gap of the motor to meet the needs of different distance measurements.

[0017] 3. An LED lamp is installed near the measuring claw of the measuring tool for illumination, so as to find the correct measuring position at the air gap of the motor with relatively dim light.

[0018] 4. A circular spirit level is installed on the fixed part of the measuring tool connected to the caliper to ensure the verticality of the ruler body during measurement and improve the measurement accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the present invention.

[0020] Figure 2 It is a schematic diagram of the partial structure of the present utility model.

[0021] Figure 3 It is a schematic diagram of the structure at the measuring head.

[0022] Figure 4 Schematic diagram of the fixed frame structure.

[0023] Figure 5 It is a schematic diagram of the existing measurement technology structure. DETAILED DESCRIPTION OF THE INVENTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings.

[0025] As Figures 1 to 5 shown, the vertical motor magnetic field center measuring tool includes a bracket 10. The upper part of the bracket 10 is fixedly connected with a digital display depth gauge 20, and the lower part is fixedly connected with a first measuring rod 30. The scale frame 201 of the digital display depth gauge 20 is fixedly connected to the bracket 10, and the lower end of its measuring rod 202 is connected with a second measuring rod 40. The first measuring rod 30 and the second measuring rod 40 are arranged in parallel, and the distance between the measuring heads at the free ends of the first measuring rod 30 and the second measuring rod 40 can be changed.

[0026] Furthermore, in order to facilitate changing the distance between the measuring heads to adapt to motors with different gaps, an "L" - shaped measuring head A 301 is fixedly connected to the free end of the first measuring rod 30, an "L" - shaped measuring head B 401 is fixedly connected to the free end of the second measuring rod 40, and the lower end of the measuring rod 202 passes through the bracket 10 and is rotatably connected to the upper end of the second measuring rod 40.

[0027] Furthermore, in order to reduce the volume of the distance measurement during installation and ensure stability during distance measurement, the first measuring rod 30 is provided with a through hole 302 set along the length, the second measuring rod 40 is inserted into the through hole 302, and the measuring head A301 is set outside the through hole 302.

[0028] Furthermore, in order to facilitate the fixation of the digital depth gauge, the bracket 10 includes a support plate 101 and a U-shaped fixing plate 102 fixed to the lower part of the support plate 101. The digital depth gauge 20 is fixedly connected to the support plate 101 through a locking frame 103. The measuring rod 202 passes through the lower end of the support plate 101 and is connected to the upper end of the second measuring rod 40 through a rotating device 50. The first measuring rod 30 is fixedly connected to the lower surface of the fixing plate 102.

[0029] Furthermore, in order to facilitate the rotation of the second measuring rod, the rotating device 50 includes an upper fixed seat 501 and a lower fixed seat 502. The upper fixed seat 501 is fixedly connected to the lower end of the measuring rod 202, and the lower fixed seat 502 is fixedly connected to the upper end of the second measuring rod 40. The measuring rod 202 and the second measuring rod 40 are coaxially arranged. The upper fixed seat 501 and the lower fixed seat 502 are rotatably connected via a rotating shaft 503. The lower end of the rotating shaft 503 is fixedly connected to the lower fixed seat 502, and the upper end passes through the top of the upper fixed seat 501 and is fixedly connected to a limiting block 504. A compression spring 505 is sleeved on the shaft body of the rotating shaft 503 between the limiting block 504 and the upper fixed seat 501. By setting the compression spring 505, there can be greater friction between the upper fixed seat 501 and the lower fixed seat 502, thereby avoiding rotation during detection.

[0030] Furthermore, the locking frame 103 includes a clamping plate 1031 with an N-shaped cross section. A notch is provided in the middle of the clamping plate 1031 for exposing the digital depth gauge 20 , and a tightening bolt 1032 is threadedly connected to the surface opposite to the notch.

[0031] Furthermore, in order to ensure the flatness and stability of the ruler during measurement and the verticality of the ruler, a level bubble 1011 is fixedly connected to the support plate 101.

[0032] Furthermore, in order to provide a light source and facilitate observation, an LED lighting lamp 303 is fixedly connected to the outer wall of the first measuring rod 30 , and a power supply 104 is fixedly connected to the bracket 10 , and the LED lighting lamp 303 is electrically connected to the power supply 104 .

[0033] Specifically, the vertical motor magnetic field center measurement tool uses 304 stainless steel parts to increase the strength of the measuring parts.

[0034] The specific usage method of the present invention is as follows: When in use, the frame part of the digital display depth gauge is locked and fixed on the support plate by the locking frame, and the measuring rod and the second measuring rod are connected through a rotating device.

[0035] Find a plane, vertically press the probe A301 and the probe B401 against the plane, center the spirit bubble, ensure the perpendicularity of the device, then set the digital display depth gauge to "zero", and start the measurement after adjustment.

[0036] When measuring the height difference between the stator and the rotor, turn on the LED lighting lamp to ensure the accuracy of the measurement positions of the probe A301 and the probe B401. Rotate the second measuring rod so that the probe A301 and the probe B401 respectively contact the tops of the stator and rotor magnetic poles. Adjust the spirit bubble to be centered to ensure the perpendicularity of the device, and then read the value, which is the actual height difference of the tops of the magnetic poles after the stator and rotor are assembled.

[0037] After measuring multiple points and taking the average value, calculate it with the stator and rotor length values to obtain the actual height difference of the magnetic field center after assembly.

[0038] On the scale body of the fixed part of the device, spirit bubbles are separately installed to ensure the perpendicularity of the device during measurement. LED lamp beads are installed on the upper part of the measuring claws for lighting during measurement. The battery box supplies power to the LED lighting lamp and controls the on and off of the lamp through a switch.

Claims

1. Vertical motor magnetic field center measurement tool, characterized in that It includes a bracket (10). A digital depth gauge (20) is fixedly connected to the upper part of the bracket (10), and a first measuring rod (30) is fixedly connected to the lower part. The scale frame (201) of the digital depth gauge (20) is fixedly connected to the bracket (10), and the lower end of its measuring rod (202) is connected to a second measuring rod (40). The first measuring rod (30) and the second measuring rod (40) are arranged in parallel, and the distance between the measuring heads at the free ends of the first measuring rod (30) and the second measuring rod (40) can be changed. An "L"-shaped probe A (301) is fixedly connected to the free end of the first measuring rod (30), and an "L"-shaped probe B (401) is fixedly connected to the free end of the second measuring rod (40). The lower end of the measuring rod (202) passes through the bracket (10) and is rotatably connected to the upper end of the second measuring rod (40). The first measuring rod (30) is provided with a through hole (302) arranged along its length, and the second measuring rod (40) is inserted into the through hole (302). The probe A (301) is arranged outside the through hole (302). The bracket (10) includes a support plate (101) and a U-shaped fixing plate (102) fixed to the lower part of the support plate (101). The digital depth gauge (20) is fixedly connected to the support plate (101) through a locking frame (103). The measuring rod (202) passes through the lower end of the support plate (101) and is connected to the upper end of the second measuring rod (40) through a rotating device (50). The first measuring rod (30) is fixedly connected to the lower surface of the fixing plate (102).

2. The vertical motor magnetic field center measuring tool according to claim 1, characterized in that The rotating device (50) includes an upper fixing seat (501) and a lower fixing seat (502). The upper fixing seat (501) is fixedly connected to the lower end of the measuring rod (202), and the lower fixing seat (502) is fixedly connected to the upper end of the second measuring rod (40). The measuring rod (202) and the second measuring rod (40) are arranged coaxially. The upper fixing seat (501) and the lower fixing seat (502) are rotatably connected through a rotating shaft (503). The lower end of the rotating shaft (503) is fixedly connected to the lower fixing seat (502), and the upper end passes through the top of the upper fixing seat (501) and is fixedly connected with a limit block (504). A compression spring (505) is sleeved on the shaft body of the rotating shaft (503) between the limit block (504) and the upper fixing seat (501).

3. The vertical motor magnetic field center measuring tool according to claim 1, characterized in that The locking frame (103) includes a clamping plate (1031) with an n-shaped cross-section. A notch for the digital depth gauge (20) to be exposed is provided in the middle of the clamping plate (1031), and a tightening bolt (1032) is threadedly connected to the opposite side of the notch.

4. The vertical motor magnetic field center measuring tool according to claim 1, characterized in that, A spirit level bubble (1011) is also fixedly connected to the support plate (101).

5. The vertical motor magnetic field center measuring tool according to claim 1, wherein An LED lighting lamp (303) is fixedly connected to the outer wall of the first measuring rod (30), a power supply (104) is fixedly connected to the bracket (10), and the LED lighting lamp (303) is electrically connected to the power supply (104).

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