JP5204033B2 - Armature inspection method and inspection apparatus - Google Patents

Description

  The present invention relates to an armature inspection method and an inspection apparatus for inspecting whether or not a short circuit such as a short circuit has occurred in a winding of an armature.

  Conventionally, in an armature of a rotating electric machine, an inspection pulse is applied between terminals of coils wound around a tooth portion of an armature core (e.g., U-phase, V-phase, and W-phase three-phase coils), It is known to determine whether or not a coil is short-circuited based on an output waveform obtained between terminals (see, for example, Patent Document 1).

  In the armature inspection method of Patent Literature 1, the presence or absence of a short circuit is determined according to the degree of variation in output waveform obtained from the terminals (difference in output waveform).

JP 2006-343235 A

  By the way, in the armature inspection method as described above, the presence or absence of a short circuit can be easily inspected when the degree (range) of variation in an armature (coil) that is not short-circuited is small.

  However, in an armature with a large degree of variation, when the above-described armature inspection method is applied, the variation in the magnetic characteristics of the core also increases, resulting in variation in the output waveform obtained between the terminals. In particular, when the armature core of a brushless motor as a rotating electric machine is configured by integrating divided cores, the gap amount, the distortion amount, and the like between the divided cores are likely to vary depending on the combination of the divided cores. In this case, the difference between the armature in which the coil is short-circuited and the armature in which the coil is not short becomes small, and even an armature whose coil is not short-circuited may be judged as a defective product, and armature inspection that solves these problems Proposal of a method is desired.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an armature inspection method and an inspection apparatus capable of more reliably inspecting the presence or absence of a short circuit in an armature coil. .

In order to solve the above-mentioned problem, the invention according to claim 1 determines whether or not the coil is short-circuited in an armature of a rotating electrical machine in which a coil is wound around each of a plurality of tooth portions provided in an armature core. in the armature inspection method of, with only measures the inter-terminal or come inductance component of the coil, and calculates the capacitance component from the correlation between the inductance and capacitance based on the measurement values of the inductance component and the measured The gist is to determine whether or not there is a short circuit depending on whether the measured inductance component and the calculated capacitance component are in the pass region.

In the present invention, only the inter-terminal or come inductance component of the coil is measured, the capacitance component is calculated from a very strong correlation between the inductance component and the capacitance component (correlation coefficient r = of 0.99), and both components Whether or not there is a short circuit is determined by whether or not is in the existing pass region. Here, when explaining a short circuit, it is a state in which a covering member of a metal wire (for example, a copper wire) covered with a covering member made of an insulating material is broken and the metal wires are in contact with each other. In such a coil, an electrically closed loop is formed. Therefore, when a current is passed through this portion, the magnetic flux is lost (decreased), the inductance component is greatly reduced, and the capacitance component is significantly increased. On the other hand, for example, when the armature is a so-called split core type, although the inductance component and the capacitance component change due to variations in the gap amount and distortion amount between the cores, the amount of change is compared with the case of the rare short. Since it is sufficiently small (see FIG. 4), it is easy to determine the presence or absence of a short circuit depending on whether or not the existing acceptable region is deviated.

Further, by using such an inspection method, it is possible to reduce the measurement error as compared with the case where both components are measured, and thus it is possible to suppress a decrease in inspection accuracy due to the measurement error.

The invention according to claim 2 is an armature inspection method for determining whether or not there is a short circuit of the coil in an armature of a rotating electrical machine in which a coil is wound around each of a plurality of tooth portions provided in an armature core. , while only measuring the inter-terminal or Lucky Yapashitansu component of the coil, and calculates the inductance component from the correlation between the inductance and capacitance based on measurements of the capacitance components and the measured and the capacitance component and the calculated and measured The gist is to determine the presence or absence of a short circuit depending on whether or not the inductance component is in the acceptable region.

In this invention, only the capacitance component is measured from between the terminals of the coil, the inductance component is calculated from a very strong correlation (correlation coefficient r = 0.99) between the inductance component and the capacitance component, and both components are already installed. Whether or not there is a short circuit is determined by whether or not it is in the pass region. Here, when explaining a short circuit, it is a state in which a covering member of a metal wire (for example, a copper wire) covered with a covering member made of an insulating material is broken and the metal wires are in contact with each other. In such a coil, an electrically closed loop is formed. Therefore, when a current is passed through this portion, the magnetic flux is lost (decreased), the inductance component is greatly reduced, and the capacitance component is significantly increased. On the other hand, for example, when the armature is a so-called split core type, although the inductance component and the capacitance component change due to variations in the gap amount and distortion amount between the cores, the amount of change is compared with the case of the rare short. Since it is sufficiently small (see FIG. 4), it is easy to determine the presence or absence of a short circuit depending on whether or not the existing acceptable region is deviated.
Further, by using such an inspection method, it is possible to reduce the measurement error as compared with the case where both components are measured, and thus it is possible to suppress a decrease in inspection accuracy due to the measurement error.

According to a third aspect of the present invention, in the armature inspection method according to the first or second aspect , the armature core is formed by winding a conductive wire around the teeth portion of the divided core divided in the circumferential direction for each tooth portion. The coil is formed, and ends of the split cores arranged in an annular shape are joined to each other, and the measured value measured between the terminals of the coil is an existing pass region. The gist of this is to determine the presence or absence of a short circuit based on whether or not there is a short circuit.

  In this invention, the armature core has a coil formed by winding a conductive wire around the tooth portion of the divided core divided in the circumferential direction for each tooth portion, and the end portions of the annularly arranged divided cores are joined. Configured. In such a configuration, there is a possibility that the gap amount between the split cores varies when joining the end portions of the split cores. Therefore, since it is sufficiently small (see FIG. 4), it becomes easy to determine the presence or absence of a short circuit depending on whether or not the existing acceptable region is deviated.

According to a fourth aspect of the present invention, in the armature inspection method according to any one of the first to third aspects, the armature core has a divided core that is divided in the circumferential direction for each tooth portion. The gist is to determine whether or not there is a short circuit depending on whether or not the measured value measured between the terminals of the coil is in an existing pass region.

  According to the present invention, the armature core is configured such that the divided core divided in the circumferential direction for each tooth portion is pressed and fixed to the inner peripheral surface of the housing. In such a configuration, the split core may be distorted when pressed against the inner peripheral surface of the housing (for example, shrink fitting). Even in such a case, the amount of change is a case of a rare short. Since it is sufficiently small (see FIG. 4), it is easy to determine the presence or absence of a short circuit depending on whether or not the existing acceptable region is deviated.

Invention of Claim 5 is an armature inspection apparatus provided with the determination means which determines the presence or absence of the short circuit of the coil of an armature using the armature inspection method as described in any one of Claims 1-4. is there.
This invention includes the determining means for determining whether the short circuit of the armature coils with armature inspection method according to any one of claims 1-4, any of claim 1-4 The effect similar to the effect as described in one item can be produced.

  Therefore, according to the above-described invention, it is possible to provide an armature inspection method and an inspection apparatus thereof that can more reliably inspect the presence or absence of a short circuit in the armature coil.

(A) is a side view of a brushless motor, (b) is the sectional view on the AA line in Fig.1 (a). (A) is a side view of the stator, (b) is a cross-sectional view taken along line BB in FIG. 2 (a). The connection diagram of a coil and an armature inspection device. The correlation diagram of inductance and capacitance.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
A housing 2 of a brushless motor 1 as a rotating electric machine shown in FIGS. 1 (a) and 1 (b) has a bottomed cylindrical shape, and a stator 3 as a cylindrical armature is baked on the inner peripheral surface thereof. It is fixed by press contact such as fitting. A rotor 4 is rotatably disposed inside the stator 3 in the radial direction. In addition, a holder 5 made of, for example, a resin material having an insulating property is fixed to an end of the housing 3 on the opening portion side of the stator 3, and the holder 5 covers one end side in the axial direction of the stator 3. .

  As shown in FIG. 2A, a stator core 6 as an armature core constituting the stator 3 includes a plurality of teeth portions 7 (this embodiment) extending radially toward the center at predetermined angles (30 ° in the figure). The end of the outer peripheral side of the split core 6a having 12 in the form is connected in the circumferential direction by the connecting member 8, and has a cylindrical shape. Insulating bobbins 9 that cover both end surfaces in the axial direction and both end surfaces in the circumferential direction of each tooth portion 7 are attached to each tooth portion 7 from both sides in the axial direction. Each of the coils 11 is wound by 10 being wound multiple times by concentrated winding. The conducting wire 10 has a configuration in which a metal wire (such as a copper wire) made of a conductive metal material (copper in this embodiment) is covered with a covering member made of an insulating resin material. Each coil 11 has a U-phase coil 12, a V-phase coil 13, and a W-phase coil according to three-phase excitation currents (U-phase, V-phase, and W-phase) as drive power supplied to the brushless motor 1. 14

  The U-phase coil 12, the V-phase coil 13, and the W-phase coil 14 are each wound around a predetermined tooth portion 7, and are continuously connected to the tooth portion 7 that is separated (not adjacent) across the other phase coils. It is wound by one conducting wire 10. In this embodiment, the U-phase coil 12, the V-phase coil 13, and the W-phase coil 14 are wound around two predetermined adjacent tooth portions 7 and straddle the tooth portions 7 corresponding to other phases. It is wound around two teeth portions 7 on the opposite sides of 180 °.

  Specifically, the U-phase coil 12 is wound around the tooth portion 7 from the start end portion 12s to the end portion 12e. And between the termination | terminus part 12e of the two U-phase coils 13 arrange | positioned at the upper side in the figure, and the start end part 12s of the two U-phase coils 12 arrange | positioned at the lower side in the figure, the connecting wire 12w is (See FIG. 2 (b)). Similarly, the V-phase coil 13 is wound around the tooth portion 7 from the start end portion 13s to the end portion 13e, and a crossover wire 13w is passed between the end portion 13e and the start end portion 13s. Similarly, the W-phase coil 14 is wound around the tooth portion 7 from the start end portion 14s to the end portion 14e, and a crossover wire 14w is passed between the end portion 14e and the start end portion 14s.

  Each of the start ends 12s to 14s, the end portions 12e to 14e, and the connecting wires 12w to 14w are arranged on one side in the axial direction of the stator 3 (left side in FIG. 2B). Each of the start ends 12s to 14s and the end portions 12e to 14e corresponds to a connection end 11a that is an end of winding start and end of each coil 11 (U-phase coil), and each connection end 11a is The covering member covering the conductive wire 10 is removed, and the metal wire is exposed. Each start end part 12s-14s and termination | terminus part 12e-14e (connection end part 11a) are pulled out to the surface on the opposite side to the stator 3 of the holder 5 (refer Fig.1 (a)), and the stator 3 in the holder 5 is opposite. Each is connected to a plurality (four in this embodiment) of terminals 15 arranged on the side surface.

  The terminal 15 includes a U-phase terminal 15a, a V-phase terminal 15b, a W-phase terminal 15c, and a neutral point terminal 15d. The U-phase terminal 15a is connected to a connection end portion 11a of the U-phase coil 12 (for example, two start end portions 12s to which the connecting wire 12w is not connected). The V-phase terminal 15b is connected to a connection end 11a of the V-phase coil 13 (for example, two start ends 13s to which the connecting wire 13w is not connected). The W-phase terminal 15c is connected to the connection end portion 11a of the W-phase coil 14 (for example, two start end portions 14s to which the connecting wire 14w is not connected). The neutral point terminal 15d is connected to the remaining connection end portions 11a of the phase coils 12 to 14 (terminal portions 12e to 14e to which the connecting wires 12w to 14w are not connected). Thus, it has a star connection structure in which the connection end 11a of each phase coil 12-14 is connected to the neutral point terminal 15d.

  As shown in FIG. 1B, the rotating shaft 20 constituting the rotor 4 is pivotally supported by a bearing 21 provided at the center of the bottom of the housing 2. A cylindrical rotor core 22 is fixed to the rotary shaft 20, and a magnet 23 magnetized with different polarities (N pole, S pole) at predetermined angles is fixed to the outer peripheral surface of the rotor core 22. ing.

  In the brushless motor 1 configured as described above, U-phase, V-phase, and W-phase excitation currents having a phase difference of 120 ° from an excitation circuit (not shown) are respectively supplied to the U-phase coil 12, the V-phase coil 13, and the W-phase coil. 14 is supplied. Then, the U-phase coil 12, the V-phase coil 13, and the W-phase coil 14 are respectively excited to generate a rotating magnetic field in the stator 3, and the rotor 4 is rotated by the rotating magnetic field.

Next, an inspection method for inspecting whether or not the coil 11 in the stator 3 of the brushless motor 1 configured as described above is short-circuited will be described.
Here, when winding the coil 11 around each tooth portion 7 of the stator core 6 in the course of manufacturing the stator 3, a short circuit such as a short circuit may occur due to the insulation coating member of the coil 11 being peeled off. The stator 3 in which the short circuit has occurred needs to be prevented from flowing out as a defective product. Therefore, the manufactured stator 3 is inspected using the inspection device 30 to determine whether or not a rare short has occurred.

  The inspection device 30 includes an LCR meter 30a connected to terminals 15a to 15c (between the V-phase coil 13 and the W-phase coil 14 in FIG. 3) which are terminals of the two coils 11, and an output signal from the LCR meter 30a. And an analyzer 30b for analyzing whether or not a short circuit such as a short circuit has occurred. In the analysis device 30b, pass regions XL and XC (see FIG. 4) are set, which are indicators for determining whether or not the coil 11 is short-circuited according to the specifications of the motor 1 and the stator 3.

  Here, in setting the pass regions XL and XC, the present inventor uses a stator divided into a non-defective product in which the coil 11 is short-circuited and a defective product in which the coil 11 is short-circuited by a conventional inspection method. The inductance component and the capacitance component were measured. As a result, as shown in FIG. 4, it can be seen that the non-defective product and the defective product are generally located on the straight line (correlation line) CL. That is, it was found that a strong negative correlation (in this embodiment, correlation coefficient r = 0.99) exists between the non-defective product and the defective product. Furthermore, it can be seen that the non-defective product and the defective product are located at a position separated by a certain distance or more on the correlation line CL. From this, it is possible to determine whether or not the product is defective. In the case of a defective product, that is, in the case of a coil 11 that has a short circuit (in a state where a covering member made of an insulating resin material is peeled off), the conductive wires come into contact with each other and a closed loop is formed in the coil 11. For this reason, current flows through this portion (contact portion between the conducting wires) and magnetic flux loss occurs, so that the inductance component is significantly reduced and the capacitance component is significantly increased as compared with the non-defective product.

  That is, the non-defective product and the defective product have greatly different inductance components and capacitance components, and these boundary regions are set as the pass regions XL and XC. In the analyzer 30b, whether the measurement result deviates from the pass regions XL and XC or not. The presence or absence of a short circuit is judged.

  The LCR meter 30a of the inspection apparatus 30 configured as described above is first connected to, for example, the terminals 15b and 15c, and an inductance component and a capacitance component between the V-phase coil 13 and the W-phase coil 14 between the terminals 15b and 15c. Measure. Then, the analysis device 30b determines whether the coils 13 and 14 are short-circuited based on whether or not the measured inductance component and capacitance component are in the existing pass regions XL and XC as shown in FIG.

  Next, the LCR meter 30a is connected to, for example, the terminals 15a and 15c, and measures an inductance component and a capacitance component between the U-phase coil 12 and the W-phase coil 14 between the terminals 15a and 15c. Then, whether or not the coils 12 and 14 are short-circuited is determined by the analyzer 30b based on whether or not the measured inductance component and capacitance component are in the pass regions XL and XC as shown in FIG.

  Next, the LCR meter 30a is connected to, for example, the terminals 15a and 15b, and measures an inductance component and a capacitance component between the U-phase coil 12 and the W-phase coil 13 between the terminals 15a and 15b. Then, the analysis device 30b determines whether or not the coils 12 and 13 are short-circuited based on whether or not the measured inductance component and capacitance component are in the pass regions XL and XC as shown in FIG.

  By the above inspection method, it is possible to accurately inspect a short circuit such as a rare short of the coil 11 (each phase coil 12 to 14). In particular, in this embodiment, the stator core 6 is joined to the end portions of the split cores 6a by the connecting member 8, and even if the gap amount between the split cores 6a is slightly varied, the capacitance component and the inductance in defective products and non-defective products. Since the difference in the components occurs, it can be easily inspected whether or not it is short-circuited (non-defective product). Further, even if the stator core 6 is shrink-fitted on the inner peripheral surface of the housing 2 and the split core 6a is slightly distorted, the difference between the capacitance component and the inductance component is similarly generated between the defective product and the non-defective product. It can be inspected whether it is (good) or not. In addition, it is possible to reliably measure both the inductance component and the capacitance component, and use the measured values to inspect for the presence or absence of a short circuit of the coil 11 with higher accuracy. It is also possible to determine which phase of the coils 12 to 14 among the phase coils 12 to 14 is short-circuited by inspecting all the patterns of the terminals 15a to 15c.

Next, characteristic actions and effects of the present embodiment will be described.
(1) Both the inductance component and the capacitance component obtained from between the terminals of the coil 11 (U-phase coil 12, V-phase coil 13, W-phase coil 14) are measured, and the measured values are applied to the existing pass regions XC and XL. Whether or not there is a short circuit is determined depending on whether or not there is. Here, when explaining a short circuit, it is a state in which a covering member of a metal wire (for example, a copper wire) covered with a covering member made of an insulating material is broken and the metal wires are in contact with each other. In such a coil, an electrically closed loop is formed. Therefore, when a current is passed through this portion, the magnetic flux is lost (decreased), the inductance component is greatly reduced, and the capacitance component is significantly increased. On the other hand, for example, when the stator 3 (stator core 6) is a so-called split core 6a type, the inductance component and the capacitance component change due to variations in the gap amount between the cores 6a. Since it is sufficiently small in comparison (see FIG. 4), it is easy to determine the presence or absence of a short circuit depending on whether or not the existing acceptable region is deviated. In addition, by reliably measuring both the inductance component and the capacitance component, it is possible to more accurately inspect the presence or absence of a short circuit of the coil by using the measured values of both components.

  (2) The stator core 6 is configured such that the divided core 6 a divided in the circumferential direction for each tooth portion 7 is fixed to the inner peripheral surface of the housing 2 by pressure contact. In such a configuration, there is a possibility that the split core 6a may be distorted when being pressed against the inner peripheral surface of the housing 2 (for example, shrink fitting). Since this is sufficiently smaller than the case (see FIG. 4), it is easy to determine the presence or absence of a short circuit depending on whether or not the existing acceptable region is deviated.

The embodiment of the present invention may be modified as follows.
In the above embodiment, the LCR meter 30a measures the inductance component and the capacitance component between the coils 11, and determines whether or not there is a short circuit depending on whether or not these measured values are in the existing pass regions XL and XC. Although the inspection method was used, it is not limited to this. For example, an armature inspection method may be used in which only the inductance component is measured, and whether or not there is a short circuit is determined based on whether or not the measured inductance component is in a pass region. Moreover, you may use the armature test | inspection method which measures only a capacitance component and judges the presence or absence of a short circuit by whether the measured capacitance component is a pass area | region.

  Further, after measuring only the inductance component, the capacitance component is calculated based on the correlation line CL (see FIG. 4), and whether or not there is a short circuit is determined based on whether or not both the measured inductance component and the calculated capacitance component are in the pass region. An armature inspection method may be used. Further, after measuring only the capacitance component, the inductance component is calculated based on the correlation line CL (see FIG. 4), and it is determined whether or not there is a short circuit depending on whether the measured capacitance component and the calculated inductance component are both acceptable regions. An armature inspection method may be used. In this way, by measuring only one of the two components and calculating the other component based on the correlation line CL, the measurement error can be reduced compared to the case of measuring both components. Therefore, it is possible to suppress a decrease in inspection accuracy due to a measurement error.

  In the above embodiment, the stator core 6 is configured by press-fixing the split core 6a to the inner peripheral surface of the housing 2 by shrink fitting or the like, but the stator core 6 may be configured by other fixing methods.

  In the above embodiment, the armature inspection apparatus is configured by the LCR meter 30a and the analysis apparatus 30b. However, the present invention is not limited thereto, and for example, the armature inspection apparatus may be configured by the LC meter and the analysis apparatus 30b. In short, what is necessary is just to comprise by the apparatus and analyzer which measure any one of an inductance component and a capacitance component.

  In the above-described embodiment, the measurement and analysis between the coils 12 to 14 (each terminal 15a to 15b) is performed three times for one stator 3, but the measurement and analysis may be performed at least twice. By setting it as such a structure, it can test | inspect whether each coil 12-14 of the stator 3 is short-circuited, and can determine whether the stator 3 is a good product or a defective product.

-In above-mentioned embodiment, although the stator core 6 was comprised by the division | segmentation core 6a divided | segmented into the circumferential direction, it is not restricted to this.
In the above embodiment, the present invention is applied to the brushless motor 1, but the present invention is not limited thereto, and may be applied to a motor with a brush.

  DESCRIPTION OF SYMBOLS 1 ... Brushless motor as a rotary electric machine, 2 ... Housing, 3 ... Stator as an armature, 6a ... Split core, 7 ... Teeth part 10 ... Conductor, 11 ... Coil, 12 ... U-phase coil, 13 ... V-phase coil, DESCRIPTION OF SYMBOLS 14 ... W phase coil, 30 ... Inspection apparatus, 30a ... LCR meter which comprises armature inspection apparatus, 30b ... Armature inspection apparatus and analyzer as judgment means, XL ... Inductance range of an inductance component, XC ... Pass range.

Claims (5)

An armature inspection method for determining the presence or absence of a short circuit of the coil in an armature of a rotating electrical machine formed by winding a coil around each of a plurality of tooth portions provided in an armature core,
With only measured between terminals or come inductance component of the coil, and calculates the capacitance component from the correlation between the inductance and capacitance based on the measurement values of the inductance component and the measured and the inductance component and the calculated and measured capacitance An armature inspection method for determining the presence or absence of a short circuit depending on whether or not a component is in an acceptable region. An armature inspection method for determining the presence or absence of a short circuit of the coil in an armature of a rotating electrical machine formed by winding a coil around each of a plurality of tooth portions provided in an armature core,
With only measured between terminals or Lucky Yapashitansu component of the coil, and calculates the inductance component from the correlation between the inductance and capacitance based on measurements of the capacitance components and the measured and the capacitance component and the calculated and measured inductance An armature inspection method for determining the presence or absence of a short circuit depending on whether or not a component is in an acceptable region. In the armature inspection method according to claim 1 or 2 ,
In the armature core, a coil is formed by winding a conductive wire around the tooth portion of the divided core divided in the circumferential direction for each tooth portion, and ends of the divided cores arranged in an annular shape are joined to each other Is configured,
An armature inspection method, wherein the presence or absence of a short circuit is determined based on whether or not the measured value measured between the terminals of the coil is in an existing pass region. In the armature inspection method according to any one of claims 1 to 3 ,
The armature core is configured such that a divided core divided in the circumferential direction for each tooth portion is pressed and fixed to the inner peripheral surface of the housing.
An armature inspection method, wherein the presence or absence of a short circuit is determined based on whether or not the measured value measured between the terminals of the coil is in an existing pass region. Armature inspection apparatus characterized by comprising determination means for determining whether the short circuit of the armature coils with armature inspection method according to any one of claims 1-4.

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