JP5292666B2 - Coil testing equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coil testing device for discriminating accurately a defective coil. <P>SOLUTION: This testing device of a coil is equipped with an impulse voltage generation means 11 for applying an impulse voltage to a coil 2 wound on the teeth 1a of a divided core acquired by dividing a toroidal stator core in each polarization, and a waveform determination means 12 for determining a vibration waveform generated in the coil by application of the impulse voltage and determining a failure of the coil based on a determination result. The testing device of the coil is characterized by being equipped with a magnetic flux control means 5 for sending a magnetic flux generated in the coil by application of the impulse voltage to a yoke part 1c from the teeth tip 1d of the divided core. <P>COPYRIGHT: (C)2007,JPO&amp;INPIT

Description

  The present invention relates to a coil test apparatus and test method, in particular, a coil for determining the quality of a coil to be measured by applying an impulse voltage to a coil to be measured wound around a split core and measuring a generated damped oscillation voltage waveform. The present invention relates to a test apparatus and a test method.

  In order to assure the quality of motors and generators, an impulse winding test for confirming the insulation state between windings is generally widely used as a method for detecting defects caused by coil windings. In this test method, when a pulse current is passed through a coil, a transient response voltage is generated in the coil, and a characteristic that shows a damped oscillation waveform is utilized. It is possible to determine a short circuit or a difference in the number of windings (see Patent Document 1).

For example, when performing a winding test of a motor, a stator assembly in which a coil is wound around a stator is prepared. In this stator assembly, a voltage of 1000 V is applied between, for example, the U phase and the V phase of the coil, a damped oscillation voltage waveform generated in the coil at this time is recorded, and a normal state coil stored in advance in the measuring instrument Compared with the damped oscillating voltage waveform generated in step (1), the quality of the coil is determined from the amount of deviation between the two waveforms.
JP-A-6-88849

  However, when the conventional coil test method described above is applied to the split core, the space around the split core is covered with air, so that the magnetic flux generated from the coil when voltage is applied is transferred from the tooth tip to the yoke rear end. It is difficult to pass through the space on the way, the detection sensitivity is low, and even if it is a defective coil, there is a problem that depending on the state, the waveform may be close to that of the normal coil and the defect may not be accurately determined is there.

  The present invention has been made paying attention to such a conventional problem, and an object of the present invention is to provide a coil testing apparatus that reliably discriminates a defective coil.

The present invention provides an impulse voltage generating means for applying an impulse voltage to a coil wound around a tooth portion of a split core obtained by dividing an annular stator core for each polarization, and an oscillation voltage generated in the coil by the application of the impulse voltage. And a waveform determination means for determining a failure of the coil based on the determination result, and a magnetic flux generated in the coil by applying the impulse voltage from the tip of the teeth portion of the split core. The magnetic flux control means includes a magnetic flux control means that flows through the yoke portion, and the magnetic flux control means is formed by laminating magnetic steel plates in a direction perpendicular to the direction of the magnetic flux, and connects the tip portion of the teeth portion of the split core and the yoke portion. A coil testing apparatus characterized by the following.

  In the present invention, since the magnetic flux control means for preferentially flowing the magnetic flux of the coil generated by the application of the impulse voltage is provided, it is possible to accurately determine the quality of the coil by accurately detecting the vibration voltage waveform without being affected by air. Judgment can be made.

  Hereinafter, the winding structure of the electric motor of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional view of a stator, and is a cross-sectional view seen from the direction of the rotation center axis of a rotor of an electric motor.

  In FIG. 1, the stator is composed of an annular stator core and a stator coil 2, and the stator core has a plurality of divided cores 1 b each having an annular tooth portion 1 a that is convex toward the inner peripheral side (rotor side) of the motor. They are formed side by side. The stator coil 2 is formed by winding the teeth 1a of the split core 1b by concentrated winding. The stator includes 3N (N is an integer of 1 or more) or more teeth portions 1a in which the stator coil 2 is concentrated and disposed.

  The split core 1b is usually formed by integrating a plurality of magnetic steel plates each having a shape including a yoke portion 1c and a tooth portion 1a in the direction of the rotation center axis of the rotor.

  The tooth portion 1a is formed with a tip portion 1d extending from the inner peripheral side end portion to the left and right in the circumferential direction, and the stator coil 2 wound around the tooth portion 1a includes the tooth portion 1a, the tip portion 1d and the yoke portion. Aligned within the area partitioned by 1c.

  The stator coil (hereinafter referred to as a coil) 2 is formed by a conducting wire 2a in which a conductor made of a highly conductive material such as copper is coated with an insulating material such as enamel.

  An insulator 3 made of an insulating material is installed between the tooth portion 1a and the yoke portion 1c and the conductor 2a. In the present embodiment, the insulator 3 is formed in a flat plate shape having a predetermined thickness arranged along the shape of the tooth portion 1a and the yoke portion 1c.

  When a predetermined current is passed through the stator coil 2 configured as described above, a magnetic field is generated between the tip 1d of the teeth 1a and a rotor (not shown) installed on the inner peripheral side of the stator via a predetermined air gap. An action is produced and the rotor which embeds a permanent magnet is rotated, and the function of an electric motor is produced.

  FIG. 2 is a diagram for explaining a jig (magnetic flux control means) 5 for installing the split core 1b around which the coil 2 is wound when the coil 2 is subjected to an impulse winding test, as viewed from the rotation center axis direction of the rotor. It is sectional drawing.

  The jig 5 has a U-shape so that the outer peripheral surface 1e and the front end 1d of the split core 1b are sandwiched or the split core 1b is installed with a predetermined gap. The height of the jig 5 in the direction of the rotation center axis is set to the same height as that of the split core 1b, and the jig 5 is integrally formed by laminating thin magnetic steel plates. Here, the minimum thickness t1 of the jig 5 is set to be equal to or greater than the circumferential thickness t2 of the tooth portion. Moreover, the magnetic steel plate which forms the jig | tool 5 uses the material which a magnetic flux passes easily, for example, silicon steel.

  FIG. 3 is a block diagram of the impulse voltage generator 10 that performs an impulse winding test on the coil 2 wound around the aforementioned split core 1b. The impulse voltage generation unit 10 includes an impulse generation circuit 11, a waveform analysis determination circuit 12, and a control circuit 13 that controls them. Based on a timing signal from the control circuit 11, the impulse generation circuit 11 generates a high voltage impulse voltage. It is generated and applied to the coil 2 to be measured. The damped oscillating voltage waveform generated in the coil 2 to be measured by this voltage application is analyzed by the waveform analysis determination circuit 12 and compared with a pre-stored comparative oscillating voltage waveform, and the measured value is determined from the amount of deviation between both waveforms The quality of the coil 2 is determined. Here, when the damped oscillation voltage waveform is detected, a high voltage impulse voltage is applied to the coil 2 in a state where the divided core 1b around which the coil 2 is wound is set on the jig 5.

  Since the voltage is applied in such a state that the coil 2 to be measured wound around the split core 2b is placed on the jig 5 made of a magnetic material, the magnetic flux generated from the coil 2 to be measured by applying the voltage is preferential. Thus, it is possible to accurately detect the damped oscillation voltage waveform without being affected by air and pass the jig 5 to accurately determine whether the coil 7 to be measured is good or bad.

  In addition, the thickness t1 of the jig 5 is set to be equal to or greater than the thickness t2 of the tooth portion 1a, and the jig 5 is formed of silicon steel, so that the magnetic flux is efficiently passed and the test determination accuracy is improved. can do.

  Further, since the jig 5 is formed by laminating in a direction perpendicular to the direction of the magnetic flux generating the magnetic material, generation of eddy current and generation of magnetic flux in the direction opposite to the magnetic flux generated by the applied current are suppressed, and the tooth portion 1a. The decrease in the magnetic flux from the tip 1d to the yoke 1c can be suppressed.

  Next, FIG. 4 is a diagram for explaining the jig 5 for installing the split core 1b around which the coil 2 is wound when the coil 2 as the second embodiment is subjected to an impulse winding test. It is sectional drawing seen from the axial direction.

  Compared to the jig 5 of the first embodiment, the shape of the jig 6 for sandwiching the split core 2b around which the coil 2 is wound is different. Specifically, the jig 6 is formed so as to follow the outer shape of the split core 1b. That is, the surface 1f of the tip portion 1d of the teeth portion 1a with respect to the rotor (not shown) is formed in an arc shape so as to face the rotating columnar rotor with a predetermined air gap, while the outer peripheral surface of the yoke portion 1c. 1e is also formed in an arc shape so that a plurality of divided cores 1b are integrated to form an annular stator core, and the shape of the jig 6 is formed to be similar to the arc surfaces 1e and 1f. The

  In this embodiment, the magnetic flux generated from the coil to be measured 2 when a voltage is applied passes through the jig 6 more efficiently than in the first embodiment, and the quality of the coil to be measured 2 can be accurately determined.

  FIG. 5 is a diagram for explaining the jig 5 for installing the split core 1b around which the coil 2 is wound when the coil 2 according to the third embodiment is subjected to an impulse winding test. FIG.

  Compared to the U-shaped jig 6 of the second embodiment, the jig 7 of the third embodiment is characterized in that it has a round shape surrounding the split core 1b.

  In the third embodiment, the magnetic flux generated from the coil to be measured 2 when the voltage is applied passes through the jig 5 more efficiently than in the second embodiment, and the quality of the coil to be measured 7 can be accurately determined. it can.

  The present invention is not limited to the embodiment described above, and various modifications and changes can be made within the scope of the technical idea, and it is obvious that these are equivalent to the present invention.

Sectional drawing of the stator as 1st Embodiment. Sectional drawing explaining the jig | tool as 1st Embodiment. The block diagram of an impulse voltage generation part. Sectional drawing explaining the jig | tool as 2nd Embodiment. Sectional drawing explaining the jig | tool as 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1a Teeth part 1b Divided core 1c Yoke part 1d Tip part 1e surface 1f surface 2 Coil 3 Insulator 5, 6, 7 Jig 10 Impulse voltage generation part 11 Impulse generation circuit 12 Waveform analysis determination circuit 13 Control circuit

Claims (7)

An impulse voltage generating means for applying an impulse voltage to a coil wound around a tooth portion of a divided core obtained by dividing an annular stator core for each polarization;
A waveform determination means for determining a vibration waveform generated in the coil by the application of the impulse voltage, and determining a failure of the coil based on the determination result;
In a coil testing apparatus comprising:
Magnetic flux control means for causing a magnetic flux generated in the coil by application of the impulse voltage to flow from the tip of the teeth portion of the split core to the yoke portion ;
The magnetic flux control means is formed by laminating magnetic steel plates in a direction perpendicular to the direction of the magnetic flux, and connects between the tip of the tooth portion of the split core and the yoke portion . 2. The coil testing apparatus according to claim 1 , wherein the magnetic flux control means is made of silicon steel. 3. The coil testing apparatus according to claim 1, wherein the magnetic flux control means is formed in a U shape so as to sandwich the divided core in the direction of the magnetic flux. Said flux control means, test device coil according to claim 1, any one of 3, characterized in that formed on the shaped B so as to surround said split cores. 5. The coil testing device according to claim 3 , wherein the magnetic flux control means has a shape similar to the shape of the outer end surface of the tooth portion and the yoke portion of the split core. 5. The coil testing apparatus according to claim 3 , wherein the magnetic flux control means has a minimum width equal to or greater than a width in a circumferential direction of the teeth portion as viewed from the stacking direction. An impulse voltage is applied to a coil wound around a tooth portion of a split core obtained by dividing an annular stator core for each polarization,
In the coil test method for determining the vibration waveform generated in the coil by the application of the impulse voltage, and determining the failure of the coil based on the determination result,
The magnetic flux generated in the coil by the application of the impulse voltage is formed by laminating magnetic steel plates in a direction perpendicular to the direction of the magnetic flux, and by a magnetic material that connects between the tip portion of the teeth portion of the split core and the yoke portion, A method for testing a coil, characterized by flowing from the tip of a tooth portion of the split core to a yoke portion.

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