RU2145762C1 - Device for testing rotor winding - Google Patents

Abstract

FIELD: electrical engineering. SUBSTANCE: device has winding testing units which supply specific voltage level to rotor winding in order to detect winding faults. Goal of invention is achieved by introduced rotor transmission facilities which moves rotor assembled with winding and collector specific intermediate position, rotor lifting-dropping facilities for moving rotor from intermediate position to test position and for returning tested rotor into rotor transmission facilities, winding testing units, which apply specific voltage to rotor winding in order to detect winding faults and judging its quality. EFFECT: prevention of operations with electric motors which rotor winding has faults. 7 dwg

Description

 The present invention relates to a method for manufacturing a rotor and a device for testing its winding, and in particular, to a method for manufacturing a rotor and a device for testing its winding, in which the laminated core of the armature is balanced and then the insulating coating of the armature winding wound on the rotor is automatically tested for damage , thus preventing the possibility of a short circuit in the armature winding.

 In recent years, electronic devices such as washing machines or air conditioners have used a large number of different motors. Such a motor has a rotor with a winding, which rotates the armature located in the stator gap using magnetic fields: a field excited in the stator winding by the current flowing through the brush, and a field excited in the armature winding by the current flowing through the brush and collector.

 The rotor used in such a motor is constituted by an armature A and a collector 14 located at the bottom of the armature A, FIG. 1. Anchor A includes an axis 11, a laminated core 12 passing through an axis 11, insulating plates 13 and 13a on both sides of the laminated core 12, and an armature coil 15 wound around the laminated core 12. The ends of the wires of the armature coil 15 are connected respectively to the collector 14 .

 In this design, when current enters the stator winding (not shown) through a brush, a magnetic field is excited in the winding. At the same time, the current flowing through the brush and collector 14 into the armature winding 15 excites a magnetic field in it. The interaction of the magnetic fields of the stator and the winding 15 of the armature causes the rotor to rotate.

 The rotor is made as follows.

 First, insulating plates 12 are superimposed on the laminated core 12 and the winding 15 is wound, which make up the armature A. Then the armature A is connected to the axis 11.

 After that, the characteristics of the armature A, such as resistance, inrush current and internal voltage, are measured. And, if the armature A has the desired characteristics, a winding test is performed, FIG. 2.

 In FIG. 2, after the insulating jaw 16 is placed on the winding 15 of the armature A, current is passed through the winding through the connecting device 18. If there is damage in the winding 15, then the current passes to the insulating jaw 16 and a voltage drop forms on it. This voltage is measured using a voltmeter 17 to determine the health of the winding 15. After that, a good quality armature A, which has passed the test of the health of the winding, is placed in the bath to impregnate the winding 15 with an impregnating solution. Then, a collector 14 is mounted on the axis 11, to which the corresponding leads of the winding 15 are connected by spot welding. This operation completes the manufacture of the rotor.

 The manufactured rotor is balanced to balance the centrifugal forces of the rotating rotor. If the balancing of the rotor ends successfully, the rotor is installed in the stator, which completes the manufacture of the motor.

 On the other hand, since the rotational force and rotor speed of the rotor usually change depending on the current flowing through the winding, the winding wound on the laminated core is coated with an insulating material such as enamel and wound with uniform turns using equipment called a winding machine.

 If the insulating material covering the winding as described above peels off for some reason during the production of the rotor and a short circuit occurs in the winding, then the magnitude of the resistance of the winding changes and leads to a change in the current flowing through the winding, which in turn leads to a change in rotational strength and speed of rotation. For this reason, before installing the finished rotor in the motor, its winding must be checked for damage.

 Known methods for checking for damage to a winding use apparatuses such as testers that require manual control. In addition, during the production of the rotor, the winding of the finished armature is tested to detect damage to the winding.

 However, when using devices such as a tester to detect damage to the rotor winding, it becomes necessary for the operator to perform this test separately. In addition, during the manufacture of the rotor, damage may occur during balancing of the rotor, which remains unnoticed, since after the impregnation process the winding is not checked, and it turns out that after connecting the collector and installing it in the motor, it cannot be used due to damage arising during the balancing process. Closest to the claimed invention is a solution known from the book of M.V. Antonova, L. S. Gerasimova "Technology for the production of electrical machines", M., Energoizdat, 1982, p. 340-341.

 The aim of the present invention is to find a method of manufacturing a rotor in which an additional check of the rotor winding after the balancing operation of the rotor is performed in order to prevent the use of a motor with a damaged rotor winding.

 The second objective of this invention is to find a device for testing the rotor winding, automatically testing both parts of the winding wound on the rotor of the motor, in the conditions of the assembly line before the operation of installing the rotor in the motor.

 To achieve the stated and other objectives of the present invention, there is provided a method of manufacturing a rotor, comprising the sequence of mounting the collector on an axis connected to an armature coated with an impregnating compound, and connecting by spot welding the armature leads to the manifold. Then, after the process of balancing the rotor, a test is performed to identify possible damage to the armature winding.

 A device for testing the winding of such a rotor is also proposed, including means for supplying the finished rotor with a winding and a collector to an intermediate test position. In addition, the means of raising / lowering the rotor feed the rotor from an intermediate position to the test site and return the tested rotor to the feed conveyor. Winding testing tools apply a certain voltage to the rotor winding delivered to the testing site in order to detect a short circuit, i.e. in order to reject faulty rotors.

The above objectives and other advantages of the present invention will become more apparent from the description of the presented design options with reference to the accompanying drawings in which:
FIG. 1 is a perspective view of a motor rotor structure;
FIG. 2 shows a known method of testing winding the armature in order to detect damage;
FIG. 3 shows a method for testing an armature winding in order to detect damage in accordance with the present invention;
FIG. 4 is a perspective view schematically showing a testing apparatus for detecting damage to the coating of a rotor winding of the present invention;
FIG. 5 shows the operation of the testing device for detecting damage to the coating of the rotor winding when the rotor is fed to the intermediate position and then raised to the testing position by means of raising / lowering;
FIG. 6 shows the operation of the testing device to detect damage to the coating of the rotor winding when a pair of test clamps extends from both sides to make contact with the rotor winding located in the test position and fed therein by means of raising / lowering; and
FIG. 7 shows the operation of a testing device for detecting damage to the coating of a rotor winding when the voltage supply tip extends to contact the rotor collector, while a pair of test clamps contact the rotor winding.

 A method of manufacturing a rotor and a testing device for the winding of this rotor used in the present invention are described below in the accompanying drawings.

 In FIG. 3, the method of manufacturing the rotor is carried out by installing the collector 24 on the axis 21, connected to the armature A covered with an impregnating solution, and connecting, using spot welding, the findings of the armature A to the collector 24. Then the rotor is subjected to a balancing process, and the armature winding 25 is tested for damage.

 In particular, during the manufacturing process of the rotor, the operator installs the collector 24 on the axis 21 connected to the armature A. After that, the findings of the armature A are spot-welded to the manifold 24.

 The rotor is then subjected to a balancing process to balance the centrifugal force of rotation of the rotor.

 After that, in order to detect damage to the armature winding 25 that occurred during balancing (Fig. 3), conductive lips 26 made of elastic material are installed on both sides of the armature winding 25 and current is supplied to the armature winding 25 through the tip 28. At this time, using a voltmeter 27, the voltage across the conductive jaws 26 is measured. If a voltage is detected on the conductive jaws 26, the rotor is rejected as unusable. If there is no voltage on the conductive jaws 26, the rotor is installed in the stator, forming a motor.

 As described above, in the method for manufacturing the rotor of the present invention, the test for detecting damage to the armature winding is performed separately after the balancing process of the laminated armature core to prevent it from being used in the presence of damage to the armature winding formed during the balancing process.

 FIG. 4 to 7 illustrate a rotor winding testing apparatus. The rotor winding testing device 100 includes rotor moving means 40 supplying the fully assembled rotor 31 with the winding 33 and the collector 32 to a certain intermediate position, and rotor raising / lowering means 50 for moving the rotor from the intermediate position to the testing position. These same devices return the tested rotor 31 to the means 40 for moving the rotor. The winding testing means 60 applies a certain voltage to the winding 33 in order to detect a short circuit in the winding 33 of the rotor 31 delivered to the test position by means of raising / lowering 50.

 And although in the presented embodiment, a step conveyor is shown as means for moving the rotor 40, which feeds the rotor 31 in steps at a certain distance in the form of a plurality of cylinders 41 and 42, any conveyor capable of moving when the actuator is turned on can be used.

 The step conveyor 40 is installed in the upper part of the lower frame 34, and its device and operation are well known in the art and therefore are omitted in this description.

 The rotor raising / lowering means 50 is formed by a first block 52 located at the bottom of the test position, a second block 53 installed in the test position and deployed with respect to the first block 52, and a rotor raising / lowering cylinder 51 of the rotor 31 located on the first block 52 , and lifted in the direction of the second block 53.

 The raising / lowering rotor cylinder 51 is mounted on the lower frame 54 using the holder 54. The first block 52, having a groove for installing the rotor, is attached to the end face of the plunger rod of the rotor cylinder 51 using the holder 55. The second block 53, also having a rotor chute, the groove of the first block 52 is attached to the upper frame 35 mounted in the upper part of the lower frame 34 using the holder 56.

 The winding testing means 60 have a voltage supply tip 71 for supplying a certain voltage to the collector 32 of the rotor 31 at the test position, and a lead / lead cylinder 72 for the voltage supply tip 71. In addition, a pair of test clamps 61 and 62 are located opposite each other on both sides of the axis of the rotor 31 located in the test position. The clamps are used to measure the leakage current of the winding 33 of the rotor 31 and are moved using cylinders 63 and 64.

 The voltage feeding tip 71 is positioned so that it extends toward the collector 32 of the rotor 31 at right angles to the axis of the rotor 31 fixed in the test position. The cylinder 72 for supplying / retracting the tip of the voltage supply is attached to one side of the upper frame 35 using the holder 73. The tip 71 of the voltage supply is also connected to the end face of the piston rod of the cylinder 72 using the holder 74 of insulating material.

 The test clamps 61 and 62 are arranged to extend in the direction of the winding 33 of the rotor 31 on both sides of the axis of the rotor 31 installed in the test position. The cylinders 63 and 64 of the lead-in / lead-out of the test clamps are fixed respectively on both sides of the upper frame 35 using the holders 65 and 66. And the clamps 61 and 62 are respectively connected to the ends of the piston rods of the cylinders 63 and 64 using the holders 67 and 68 of insulating material.

 Conductive jaws 81 and 82 are located on the inner surfaces of the test clamps 61 and 62, respectively. In FIG. 4 through 7, numbers 57, 69, 70 and 75 indicate guide rods.

 In the rotor winding testing apparatus 100, a plurality of rotors 31 are sequentially fed in increments of the cylinders 41 and 42, and as soon as the rotor 31 reaches a certain intermediate position, the raising / lowering cylinder 51 acts so that the rotor rises to a certain testing position from the conveyor 40 using the block 52 (Fig. 5).

 When the rotor 31 is raised to the test position and secured with the first 52 and second 53 pads, the cylinders 63 and 64 for feeding / discharging the test clamps 61 and 62 are pushed onto the rotor 31 from both sides. Test clamps 61 and 62 are supplied until the winding 33 of rotor 31 is in contact with the conductive jaws 81 and 82 located on the inside of the test clamps 61 and 62.

 After the end of the movement of the test clamps 61 and 62, the cylinder 72 for supplying / retracting the tip of the voltage supply is activated, which moves the tip 71 of the voltage supply through the hole in the test clip 61 until it contacts the collector 32 of the rotor 31. After that, voltage is supplied to the collector 32 through the tip 71 which is applied to the winding wound around the rotor 31. The value of the current flowing through the test clamps 61 and 62 in contact with the winding 33 on both sides of the rotor 31 and is the presence of damage to the coating of the winding 33.

 When the testing of the rotor 31 is completed, the voltage supply tip / lead cylinder 72, the test clamp lead / drop cylinders 63 and 64 of the rotor raise / lower cylinder 51 are sequentially operated in the reverse order described above. After that, the tested rotor 31 is returned to the conveyor 40. The next rotor 31 is supplied step by step using cylinders 41 and 42, repeating the above steps.

 On the other hand, the rotor 31 with the detected defects is removed from the conveyor 40 manually or by means of a device of poor quality selection not shown.

 As a result, in the device 100 for testing the rotor winding, defects in the winding 33 are detected during the movement of the rotor 31 along the conveyor 40. Therefore, defects in the winding 33 wound on the rotor 31 can be detected by automatic testing on the assembly line and the rotor 31 having damage to the winding 33, may be removed prior to installation in the motor.

 Although the present invention has been described with reference to the presented embodiment, experts in the art will understand that various changes in form and details are possible that do not alter the spirit and scope of the present invention defined by the claims.

Claims (1)

 A rotor winding testing device comprising rotor moving means for moving a fully assembled rotor to a specific intermediate position, rotor raising / lowering means for moving the rotor from the intermediate position to which it was delivered by moving means to a specific test position and returning the tested rotor to the moving means and winding testing means, characterized in that the means for raising / lowering the rotor comprise two rotor holding pads, the first of which is located on the lower side of the intermediate test position, and the second is installed in the test position and deployed in the direction of the first rotor holding block, the first rotor holding block is connected to the rotor raising / lowering cylinder towards the second rotor holding block, and the winding testing means made in the form of a tip supply voltage to the rotor manifold, which is located in the test position, connected to the cylinder of the supply / removal of the tip of the voltage supply and a pair of test clamps mounted opposite each other on both sides of the axis of the rotor to measure the value of the leakage current from the rotor winding, respectively connected to a pair of cylinders of summing / withdrawing test clamps.

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