JPH0349549A - Inspecting method for air gap - Google Patents

Abstract

PURPOSE:To accurately inspect by towing a head after end of combination of a rotor and a stator, simultaneously pulling a plurality of gap gauges from an air gap, and inspecting the peripheral deviation amount of the gap according to its resistance force. CONSTITUTION:Since a plurality of gap gauges 12 are integrated with a head 11, the gauges 12 can be simultaneously simply inserted to a plurality of peripheral positions of the air gap at the time of combination of a rotor 32 and a stator 35. After the rotor 32 and the stator 35 are assembled, the head 11 is pulled to simultaneously pull out the gauges 12 from the gap. Accordingly, a resistance force when the gauges 12 are pulled out is measured to directly quantitatively inspect the peripheral deviation amount of the gap.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an air gap inspection method for a conductive electric motor.

[Prior Art] A rotary pressure control unit, which is often used in air conditioners, has a built-in conduction motor, and its assembly consists of a cylinder 31 and a rotor 32, as shown in Fig. 6. The cylindrical body 36, in which the 'r-nong 34 and the stator 35 are integrated, is assembled to the core body 33 which has been integrated into one body.

After finishing the silk stand, is the inducement purchased in the rotary compressor? The air gap between the rotor 32 and stator 35 of the S-motor is checked. This inspection work is normally carried out by sequentially inserting feeler gauges into the air gear in the circumferential direction and inspecting the entire circumference of the air gear. Another method is to drive a complete induction dragon remotely and estimate the amount of air gap from the vibration and gag flow changes at that time.
monitoring for detecting
air gap centricity in la
"rge induction motors" (IEE
PROCEEDINGS, vol. 133,Ptr8,
No. 3, MAY 1986 P155-■63).

[Means for Solving the Invention] However, in air gap inspection using a gap gauge,
Inspection work takes time, there is a risk of inspection errors, and furthermore, quantitative inspection is not possible. On the other hand, when estimating the air gap amount from vibrations and current changes of the induction motor, the air gap is quantitatively inspected. However, the test data is an estimate. Furthermore, a complex inspection device is required to perform highly accurate inspection. Furthermore, since the induction motor can only be inspected after it has completely failed, it is difficult to repair it even if an air gap abnormality is found.

The present invention was made in view of such circumstances, and
An object of the present invention is to provide an air gap inspection method for simply and directly inspecting the air gap of an induction motor during assembly.

(Means for solving the JA problem) The air gap inspection method of the present invention is a method for inspecting the gap amount of an air gap formed between a rotor and a stator of an induction motor, and extends from the head in an octopus shape. When the stator and rotor are being assembled, the multiple gap gauges taken out are simultaneously inserted into multiple positions in the circumferential direction of the air gap, and after the rotor and stator have been assembled, the head is pulled to fill the multiple gaps. It is characterized by simultaneously pulling out the gauge from the air gap and inspecting the circumferential deviation of the air gap based on the resistance force when pulling it out.

[For production]

Since the plurality of gap gauges are integrated at the heel, the gap gauges can be easily and simultaneously inserted into a plurality of positions in the circumferential direction of the air gap when the rotor and stator are combined.

At that time, the plurality of feeler gauges also function as gasop setting holders. After combining the rotor and stator,
By dragging the throat, multiple feeler gauges can be pulled out from the air gap at the same time. When the air gap is formed uniformly in the circumferential direction, the plurality of clearance gauges can be pulled out from the air gap with almost no resistance.

If the air gap is uneven in the circumferential direction due to deflection of the rotor, deviation of the bearing, etc., the gripping force on the feeler gauge will increase at the portion where the air gap is narrow. As a result, the resistance force when pulling out a plurality of feeler gauges increases, and the degree of this increase increases as the air gap becomes more uneven.

Therefore, by measuring the resistance force when pulling out the feeler gauge, the amount of deviation in the circumferential direction of the air gap can be directly quantitatively inspected.

Embodiment] An embodiment of the present invention will be described below regarding a rotary compressor with a built-in induction motor.

Figure 1 shows the inspection jig used in the inspection method of the present invention.
It is a perspective view showing an example.

The inspection jig 10 consists of a hemlock 1l and a plurality of gap gauges 12 extending in an octopus shape from the head 11. The head 11 is large enough to pass through the stator of the induction motor built into the rotary compressor to be inspected, and a hook 13 is attached to the head.
has. Each feeler gauge 12 has the same shape and has a thickness corresponding to the normal size of the air gap formed between the rotor and stator of the induction motor. The number of gap gauges 12 is such that the air gap can be simultaneously inspected with the required precision in the circumferential direction, and in the illustrated example, six pieces are used.

FIG. 2 is a schematic diagram showing an example of an inspection device used in the inspection method of the present invention.

The inspection device 20 is provided above the assembly line for the rotary compressor 30. The rotary compressor 30 carried directly under the inspection device 20 has a core body 33 that combines a cylinder 3l and a rotor 32, a casing 34, and a stator 35.
The cylindrical body 36 which is a combination of the two is in a state where the mounting number is rounded by sponoto welding.

Gap gauges 12 of the inspection jig 10 are inserted into the air gap between the rotor 32 and the stator 35 at equal intervals in the circumferential direction.

The drawing cylinder 21 of the inspection device 20 is vertically provided directly above the assembly line of the rotary compressor 30. In the middle of the rotor 22 of the drawing cylinder 21,
A tension type load cell 23 is interposed to detect the axial stress applied to the load cell 22. Ronodo 22
At the tip of the inspection jig 10, a claw 24 is provided for a hook 13 shaped like the hemlock l1 of the inspection jig lO. The pawl 24 is driven by a pawl driving cylinder 25 to engage with the hook 13 and disengage from the hook 13.

FIG. 3 is a schematic diagram showing step-by-step an inspection method using the inspection jig 10 and inspection device 20.

Rotary pressure 4i to be tested? i machine 30 is cylinder 3
1 and the rotor 32 are supplied onto an assembly line in the form of a core body 33 that is joined together. First, the inspection jig IO is placed on the vertical rotor 32 from above. Next, a cylindrical body 36 in which a cylindrical casing 34 and a stator 35 are combined is fitted onto the core body 33 from above. As a result, the stator 35 is fitted to the outer peripheral side of the rerotor 32, and the multiple gap gauges 12 of the inspection jig IO are inserted in the circumferential direction into the air gap between the two. The feeler gauge 12 contributes to maintaining the air gap at an appropriate value over the entire circumference.

When the cylindrical body 36 is combined with the core body 33, the cylinder 31 and the caning 34 are brought into contact with each other at multiple locations in the circumferential direction to fix the core body 33 and the cylindrical body 36.

The rotary compressor 30 is transported directly below the inspection device 20 in this state.

When the rotary compressor 30 that is being assembled is placed directly under the inspection device 20, the extraction cylinder 2 of the inspection device 20
1 is activated, its rond 22 extends downward, and the claw 24
is engaged with the hook 13 of the inspection jig IO by the operation of the claw driving cylinder 25. Then, the extraction cylinder 21 operates in the opposite direction with the low-pressure compression mso clamped, and the inspection jig IO is pulled upward. From now on, a plurality of gap gauges 12 are simultaneously pulled out from the air gap, and the maximum value of the axial stress applied to the rod 22 at that time is measured using the tensile type rotor cell 23. The maximum stress measured by the load cell 23 indicates the pull-out resistance of the feeler gauge 12.

When the air gap is maintained at an appropriate value in the entire circumferential direction, the plurality of gap gauges 12 are pulled out from the air gap with a slight force. Therefore, the maximum stress measured by the load cell 23 is small. If the air gap is locally narrowed in a specific part in the circumferential direction due to strain in the rotor 32 or deviation of its bearings, the feeler gauge 12 interposed in that part will cause the rotor 32 and stator 35 to exert strong pressure. Therefore, the force required to pull up the measuring jig IO increases,
The maximum stress measured by the rotor cell 23 increases.

This maximum stress increases as the degree of deviation of the air gap increases. Therefore, by comparing this maximum stress with the relationship between the maximum stress and the air gap deviation determined in advance for each model, the circumferential deviation view of the air gap can be measured. The maximum value of the force required for pulling out is measured when the rotor 32 and stator 35 are pulled out.
This is because the contact area of the feeler gauge 12 with respect to the gap gauge 12 is reduced, and the force required for pulling out is reduced.

No. 412l shows the characteristic change in the pull-out force measured by the load cell 23. The pulling force reaches its maximum value at the same time as the pulling starts, and then rapidly stops freezing. Figure 5 is a graph showing the maximum value of the pull-out force measured by the load cell 23 for a plurality of low-pressure compressors. There is.

Although the above embodiment describes an air gap inspection of an induction motor built into a rotary compressor, the present invention is not limited thereto, and may be applied to air gap detection of other induction motors. can.

〔Effect of the invention〕

The air gap inspection method of the present invention can quickly inspect the entire circumference of the air gap of a conductive motor using a simple device. Furthermore, since this inspection is a direct method using a feeler gauge and is a method for regularly detecting air gap defects, air gap defects in one of the largest conductive motors can be detected with high precision.

Furthermore, since inspection is performed during assembly, defective products can be easily repaired.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of an inspection jig used in the inspection method of the present invention, FIG. 2 is a schematic diagram showing an example of an inspection device, and FIG. -A schematic diagram showing an example step by step; Figures 4 and 5 are graphs showing the measured data of the pulling force of the inspection jig; Figure 6 is a schematic diagram to explain the assembly process of a rotary compressor. It is a diagram. In the figure, 1O: inspection jig, 11: heel, 12 feeler gauge, 20: inspection device, 23: rotary cell, 30: rotary pressure I1iiIIJ. , 32: Rotor, 35: Stator. Figure 6 Figure 2 Figure 33 Figure 4 Figure 5

Claims (1)

[Claims] (1) Rotor (32) and stator (35) of induction motor
A method for inspecting the amount of air gap formed between a stator (35) and a rotor (35), in which a plurality of gap gauges (12) extending in an octopus shape from a head (11) are
When the rotor (32) and the stator (35) are combined, the head (11) is pulled and the plurality of gap gauges ( 12) is simultaneously pulled out from the air gap, and the amount of deviation in the circumferential direction of the air gap is inspected based on the resistance force at the time of pulling out.