DE112019005923T5 - Inspection system for a stator - Google Patents

Abstract

This inspection system comprises a test container (3) with an electrical machine housing (3a) and a cover body (3b). The electrical machine housing (3a) comprises an opening (3d), has a cylindrical shape with a bottom, and has an electrical machine chamber (3c) to which a stator (1) is attached, formed in its interior. The electric machine chamber (3c) serves as a test chamber. The cover body (3c) is provided for closing the opening (3d) on the electrical machine housing (3a) and is able to seal off the electrical machine chamber (3c). A stirrer (35) capable of stirring a test liquid (17) and a liquid supply channel (8) which is in (fluid) communication with a liquid tank (7) are provided on the cover (3b) .

Description

Technical area

The present disclosure relates to an inspection system for a stator.

State of the art

A stator constituting a motor and the like includes a coil made of an insulation-coated conductive wire. A specific example of the insulation coated conductive wire is an enameled wire made of a copper lead wire covered with an insulation layer made of enamel. If an invisible defect such as a pin hole or a scratch forms (or develops) on the insulation layer of the insulation-coated conductive wire, the coil may be short-circuited in an electrically conductive atmosphere, resulting in failure of some essential functions of the motor and the like .

Patent Document 1 discloses an inspection system that can be applied to inspection of such a stator. This inspection system comprises a test container and an inspection device. The test container has a test chamber in which the stator can be used in a sealed state and can be immersed in a test liquid that is electrically conductive. A housing with a motor housing and a compressor housing is attached to the test container. The motor housing has a cylindrical shape with a bottom and has an opening. The inside of the motor housing has a motor chamber to which the stator is attached. The motor chamber serves as the test chamber. The motor chamber contains a rotor which, together with the stator, forms a motor mechanism. The compressor housing is connected to the motor housing and contains a compression mechanism driven by the rotor. The inspection device comprises a first connection terminal (or a first connection connection piece, a first connection terminal) which is connected to a connection (piece) of a stator, a second connection connection which is connected to the compressor housing, and an ammeter, which is connected to the first connection port and the second connection port. The inspection device is designed to inspect (or to test, to examine) a leakage current (or an electrical leakage) from the stator through the test liquid.

Patent Document 2 discloses an inspection system comprising a test container, an inspection device, a stirring mechanism, and an electrical conductivity measuring device. The test container is not a housing as disclosed by Patent Document 1. The inspection device comprises a connection terminal (or connection terminal) which is connected to a terminal of the stator, a test electrode which is provided in a test liquid inside the test container, and an ammeter which is connected to the connection terminal ( or the connection terminal) and the test electrode is connected. The stirring mechanism is provided within the test chamber and is set up to stir the test liquid. The electrical conductivity measuring device has a predetermined number of test electrodes provided in the test liquid within the test container and ammeters connected to the corresponding test electrodes. The inspection device is designed to inspect leakage current from (or from) the stator through the test liquid based on the electrical conductivity of the test liquid measured by the electrical conductivity measuring device.

When the (quality) requirement (or quality assurance) of a stator is inspected by one of these inspection systems, the test liquid is fed to the test chamber and the stator is immersed in the test liquid. Then the inspection device checks the leakage current from the stator. Since (only) the stator attached to the motor housing forms the motor into a product, the fulfillment of the (quality) requirement (or quality assurance) of the stator is preferably inspected in one state from a point of view of the feasibility of assembling the motor (or checked, removed), in which the stator is (already) attached to the motor housing, as in the inspection system of patent document 1.

Patent specifications cited

• Patent Document 1: Japanese Patent Application Publication No. 2012-73207
• Patent Document 1: Japanese Patent Application Publication No. 2009-53145

Summary

Technical problem

However, in the inspection system of Patent Document 1, the compression mechanism is built into the case, and the motor mechanism including the stator and the rotor is also immersed in the test liquid and built into the case. Due to this configuration (or construction), the test liquid is not stirred in contrast to the test liquid in the inspection system according to Patent Document 2, whereby the test liquid stands still, which causes a doubt (or problem area) with regard to the inspection accuracy.

In the inspection system according to Patent Document 1, too, the rotor is also immersed in the test liquid in addition to the stator. Therefore, the product is not ready until both the rotor and the stator have dried, even after it has been confirmed that the stator is acceptable (or quality assured). This leads to increased product costs.

In addition, in the inspection system according to Patent Document 1, the test liquid must be fed into the housing in which the compression mechanism is also assembled, so that time and effort for operations such as e.g. B. Removal of the compressor housing are required. The compression mechanism may also come into contact with the test fluid while the compressor housing is being removed. In this case, the compression mechanism must also be dried to complete the product. This also increases the product costs.

The present invention has been made in view of the above circumstances; and it is an object of the present invention to provide an inspection system for a stator, in which an excellent workability of assembling a motor or the like is achieved, inspects the fulfillment of the (quality) requirement (or inspection quality, quality assurance) of the stator very precisely (or checked) and the product costs are reduced.

the solution of the problem

• einen Prüfbehälter mit einer Prüfkammer (bzw. einem Prüfraum), in die (bzw. in den) der Stator in einem abgedichteten Zustand (bzw. abgedichtet) einsetzbar und in eine Prüfflüssigkeit, die elektrisch leitfähig ist, (ein)tauchbar ist;
• eine Inspektionseinrichtung (bzw. Inspektions-/Prüfvorrichtung), die dazu eingerichtet ist, einen Leckstrom (bzw. eine elektrische Leckage) von dem (bzw. aus dem) Stator durch die Prüfflüssigkeit zu inspizieren (bzw. zu untersuchen, zu prüfen); und
• einen Flüssigkeitstank, der über einen Flüssigkeitszufuhrkanal [bzw. Flüssigkeitszufuhr(durch)gang] mit der Prüfkammer in (Fluid-)Verbindung steht und die Prüfflüssigkeit vorhält.
• Der Prüfbehälter hat (bzw. weist auf) eine Zylinderform mit einem Boden (bzw. eine Zyylinderbodenform) und hat (bzw. weist auf) eine Öffnung, und hat (bzw. umfasst, weist auf) eine Elektromaschinenkammer (bzw. einen Elektromaschinenraum), an der (bzw. an dem) der Stator innen befestigt ist, ein Elektromaschinengehäuse, in dem die Elektromaschinenkammer als die Prüfkammer dient, und einen Deckelkörper, der an dem Elektromaschinengehäuse vorgesehen und dazu eingerichtet ist, die Öffnung zum Abdichten der Prüfkammer zu verschließen.
• Der Deckelkörper hat (bzw. umfasst, weist auf) einen Rührmechanismus, der dazu eingerichtet (bzw. ausgelegt) ist, die Prüfflüssigkeit zu rühren, und den Flüssigkeitszufuhrkanal.

An inspection system (or a test system, a control system, a system for test control / quality assurance) for a stator according to the present invention is an inspection system for a stator having a coil with an insulation-coated conductive wire. The inspection system has (or comprises, has):

• a test container with a test chamber (or a test room) into which the stator can be inserted in a sealed state (or sealed) and can be immersed in a test liquid that is electrically conductive;
• an inspection device (or inspection / testing device) which is configured to inspect (or to examine, to test) a leakage current (or an electrical leakage) from (or from the) stator through the test liquid; and
• a liquid tank, which is connected via a liquid supply channel [resp. Liquid supply (through) passage] is in (fluid) connection with the test chamber and holds the test liquid.
• The test container has (or has) a cylindrical shape with a bottom (or a cylinder bottom shape) and has (or has) an opening, and has (or includes, has) an electrical machine chamber (or an electrical machine room), to which (or to which) the stator is internally attached, an electrical machine housing in which the electrical machine chamber serves as the test chamber, and a cover body which is provided on the electrical machine housing and is designed to close the opening for sealing off the test chamber.
• The cover body has (or comprises, has) a stirring mechanism which is set up (or designed) to stir the test liquid, and the liquid supply channel.

According to the inspection system of the present invention, the electric machine housing to which the stator is attached is used as part of the inspection container, which enables quick assembly of a motor or the like after inspection.

In this inspection system, the agitator is provided on the cover body provided on the electric machine housing, so that the agitator stirs the test liquid in the electric machine housing. Therefore the test liquid hardly comes to a standstill. The stirring mechanism may have a shaft portion extending toward the test liquid and a stirrer provided on the shaft portion and driven to rotate in the test liquid.

Furthermore, in this inspection system, the liquid supply channel is provided on the cover body provided on the electrical machine housing, so that the test liquid in the liquid tank can (or is) easily fed into the test chamber.

In this inspection system, too, the electrical machine housing has (or contains) neither a compression mechanism nor a rotor, in contrast to the conventional inspection system. The compression mechanism and the rotor are not moist (or wetted) by the test liquid, so that the compression mechanism and the rotor do not have to be dried in order to complete the product after the inspection.

Therefore, according to the inspection system according to the invention for the stator, an excellent feasibility of assembly (or assemblability, assemblability) of the motor or the like is achieved, the test quality (or quality assurance) of the stator is very accurate (or with high accuracy) inspected (or carried out) and the product costs are reduced.

The inspection system preferably has a pressure change device which is operated via a pressure change channel [or Pressure change (through) passage] communicates with the test chamber [resp. is in (fluid) connection] and is set up to (change) a pressure in the test chamber. The cover body is preferably provided with the pressure change channel and a pressure sensor which is set up to detect the pressure in the test chamber. When the pressure changing device is a pressure reducing device, the pressure in the test chamber is reduced and air contained in the test liquid is eliminated even around the coil. If the pressure changing device is a pressurizing device, the pressure in the test chamber is increased and the test liquid penetrates (or permeates) the coil. In this way, a higher inspection accuracy can be achieved. In addition, since the pressure sensor provided on the cover body detects the pressure in the test chamber, a separate pressure sensor is not required for the test container, which enables the inspection to be carried out quickly.

The electrical machine housing is preferably arranged on a scale. In this case, since an amount of the test liquid fed into the test chamber for immersing the stator can be measured by the balance, a separate sensor for the test chamber is not required to detect a liquid level of the test liquid, which enables the inspection to be carried out quickly.

The electrical machine housing can have a (fluid) connection port which provides a (fluid) connection (or communication) between an outside of the electrical machine housing and the test chamber. The (fluid) connection port is (or is) preferably closed when the test liquid is (or is) held in the test chamber, and is (or is) preferably opened when the test liquid is discharged from the test chamber. will). If the stator forms the electric compressor, a suction connection configured on a motor chamber serving as an electric machine chamber is the (fluid) connection connection. In this case, the (fluid) connection port formed in the electric machine housing can be used effectively.

The stator can be designed in the shape of a ring. The stirring mechanism may have the shaft portion rotatably supported by the lid body and the stirrer fixed to the shaft portion so as to be integrally rotatable and disposed inside the stator. The stirrer preferably has (or comprises) magnetic material, has (or comprises) a plurality of projections which protrude from the shaft section in the direction of the stator (or towards the stator) and are arranged circumferentially along an inner circumferential surface of the stator and rotates as a reluctance motor when current (or power) is applied to the stator. In this case, a separate drive source for stirring the test liquid is not required, which reduces the inspection cost. The large number of projections serving as salient poles of the reluctance motor protrude from the shaft section towards the stator (in the direction of the stator), which is suitable for stirring the test liquid.

Advantageous Effects of the Invention

Therefore, according to the inspection system according to the invention for the stator, an excellent feasibility of the assembly (or assemblability, assemblability) of the motor or the like is achieved. carried out) and the product costs are reduced.

Figure list

• 1 Fig. 3 is a schematic cross-sectional view of an inspection system according to a first embodiment.
• 2 Fig. 13 is a partially enlarged cross-sectional view of a connector and surrounding parts related to the inspection system according to the first embodiment.
• 3 Fig. 13 is a cross-sectional view of a motor case and surrounding parts related to the inspection system according to the first embodiment.
• 4th Fig. 13 is a partially enlarged cross-sectional view of a connector and surrounding parts related to an inspection system according to a second embodiment.
• 5 Fig. 13 is a cross-sectional view of a stator, a stirrer and surrounding parts related to the inspection system according to the second embodiment.

Description of the embodiments

First and second embodiments of the present invention will now be described with reference to the accompanying drawings. In the first embodiment and the second embodiment, the acceptability [resp. the Test quality, the fulfillment of the (quality) requirement] of a stator 1 used for a motor section of an electric compressor for a vehicle is inspected (see 1 and 3 ).

First embodiment

As in 1 As illustrated, an inspection system of the first embodiment has (or comprises) a test container 3 , an inspection facility 15th and a liquid tank 7th .

As in 3 shown, the test container 3 a motor housing 3a and a lid body 3b on. The motor housing 3a forms part of a shell of an electric compressor for a vehicle. The motor housing 3a has a cylindrical shape with a bottom and has an opening at an upper portion 3d on. The ring-shaped stator 1 is on an inside of a motor chamber 3c of the motor housing 3a attached by shrink fit. The motor housing 3a has a suction connection 3e (or a suction opening 3e ) at a lower end of a side wall of the motor housing 3a to a (fluid) connection between an outside of the motor housing 3a and the motor chamber 3c to accomplish. The motor housing 3a corresponds to an electric machine housing of the present invention, and the motor chamber 3c corresponds to an electric machine chamber of the present invention. The engine chamber 3c serves as the test chamber of the present invention. The suction connection 3e corresponds to a (fluid) connection port of the present invention.

The lid body 3b is made of resin. The lid body 3b is from above at the opening 3d of the motor housing 3a attached to the opening 3d to close. Thus is the motor chamber 3c lockable (or sealable, sealable). A test liquid 17th as in 1 is shown is from the liquid tank 7th into the motor chamber 3c fed so that the stator 1 17 can be immersed in the test liquid. Examples of the test liquid 17th include a water adjusted to have constant electrical conductivity, a liquid mixture of a fluorine-based inert liquid and a conductive liquid, and a salt water.

As in the 2 and 3 shown includes the stator 1 a coil 1a , a core 1b, a connector 1c, pipes 1d, connections 1e, a sealing (ungs) element 1f (or sealing body 1f) and sealing (ungs) elements 1g.

The sink 1a is made from an enamelled wire made from a copper wire covered with an insulating layer of enamel. The core 1b has a plurality of slots. Each slot takes the spool 1a on. The connector 1c is in the motor housing 3a held. The connector 1c is made of resin and has three passages (or passages) inside the connector 1c.

As in 2 Shown are three sets of two lines 1 i moving off the coil 1a enameled wires extending into the respective pipes 1d made of resin at positions immediately in front of the connector 1c. The tubes 1d are held in the terminals 1e in the passages, respectively, in the connector 1c, and the copper wires of each set of leads 1i are in the corresponding tube 1 d with the corresponding connection 1 e electrically connected.

Electrical connection pins 29 (or electrical connection pins 29) are inserted into the terminals 1e, respectively. The electrical connection pins 29 are outside the motor housing 3a to be connected to an inverter built into the electric compressor.

The sealing element 1 f is in the connector 1 c so that the pipes 1d are deformed together with the pipes 1i. A gap between the sealing element 1f and the port 1c is closed with a resin sealant. In this stator 1 are just gaps between the tubes 1d and the corresponding sets of two pipes 1i, uniformly pressed passages. The sealing elements 1g are in corresponding through holes 3f of the motor housing 3a fitted through which the three electrical connection pins 29 are inserted, so that the sealing elements 1g seal the corresponding electrical connection pins 29.

As in 1 shown, the liquid tank communicates 7th with the test container 3 via a liquid supply channel 8th [or. is in (fluid) connection with this]. The test container 3 is via a first recovery channel 10a (or first return channel 10a), which is connected to the suction connection 3e of the motor housing 3a is in (fluid) connection, can be (fluid) connected to a filtration unit 12. The filtration unit 12 is connected to the liquid tank via a second recovery channel 10b (or second return channel 10b) 7th in (fluid) connection. The first recovery channel 10a and the second recovery channel 10b are provided with a liquid feed pump, not shown.

The liquid tank 7th keeps those out of the motor chamber 3c of the test container 3 recovered (or returned) test liquid 17th before, in a vacuum. As in 3 shown, passes through the liquid supply channel 8th the lid body 3b of the test container 3 and sees a (fluid) connection between a lower portion of the Liquid tanks 7th and the motor chamber 3c in front. The fluid supply channel 8th is provided with an electromagnetic on / off valve 16 (or opening-closing valve 16).

The first recovery channel 10a is provided with an electromagnetic open / close unit 14 (or opening-closing unit 14), which is the suction connection 3e opens to a (fluid) connection between the motor chamber 3c and to provide an inside of the first recovery passage 10a, and the suction port 3e closes to the motor chamber 3c to seal. The electromagnetic open / close unit 14 closes the suction connection 3e when the test liquid 17th in the engine compartment 3c is held up.

As in 1 As shown, the inspection system of the first embodiment also has (or includes) a vacuum pump 5 that came with each of the test containers 3 connected is. As in 3 shown, passes through a pressure reduction channel 19th the lid body 3b of the test container 3 and sees a (fluid) connection between the vacuum pump 5 and the motor chamber 3c in front. The pressure reduction duct 19th is also provided with an electromagnetic on / off valve 9 (or opening-closing valve 9), as in FIG 1 shown. The vacuum pump 5 corresponds to a pressure reducing device serving as a pressure changing device, and the pressure reducing channel 19th corresponds to a pressure change channel. The vacuum pump 5 is set up to maintain a pressure in the motor chamber 3c to reduce to at least a predetermined negative pressure when the electromagnetic open-close valve 9 is opened (or is).

As in 3 illustrated, a motor 35a is on an upper surface of the lid body 3b of the test container 3 intended. A rotating shaft of the motor 35a is provided with a shaft portion 35b connected by the cover body 3b and extends down into the core 1b of the stator. The wave section 35b is from (or through) the cover body 3b rotatably mounted. A stirrer 35c is at a lower end of the shaft section 35b attached so that the stirrer 35c integral with the shaft section 35b is rotatable. The motor 35a, the shaft section 35b and the stirrer 35c form a stirring mechanism 35 the end.

As in the 1 and 3 shown is the inspection device 15th with one on a bottom wall of the motor housing 3a provided connection terminal 27 and electrically connected to a connection terminal 31 connected to one of the electrical connection pins 29. The inspection facility 15th detects an insulation resistance between the connection terminal 27 and the connection terminal 31 to inspect electrical leakage from the stator 1 through the test liquid 17th .

The inspection system further comprises a control device 13, as in FIG 1 shown. The control device 13 is connected to the vacuum pump 5 and the inspection facility 15th electrically connected. The motor housing 3a is on a scale 33 arranged. The lid body 3b has (or includes) a pressure sensor 25th , which is formed, a pressure in the motor chamber 3c capture. The control device 13 is also with the scales 33 and the pressure sensor 25th electrically connected. The electromagnetic open / close valves (or open-close valves) 9 and 16, the electromagnetic open / close unit (or open-close unit) 14 and the motor 35a of the agitator 35 are also electrically connected to the control device 13. The control device 13 controls these components.

The fulfillment of the (quality) requirement of the stator 1 is inspected (or checked, controlled) using this inspection system. As in the 1 and 3 shown is the stator to be tested 1 already on the inside of the motor chamber 3c of the motor housing 3a attached. As in 2 As shown, the three electrical connection pins 29 provided on the connector 1c stand from the motor housing 3a through the corresponding through holes 3f and the corresponding sealing elements 1g in the motor housing 3a are formed to the outside. The connection terminal (or the connection terminal) 31 is connected to one of the three electrical connection pins 29.

Then, as in the 1 and 3 shown, the cover body 3b closed. At this time, the control device 13 closes the electromagnetic on / off valve 9 and the electromagnetic on / off valve 16 in a state in which the test liquid 17th not in the engine compartment 3c is available. The control device 13 also operates the electromagnetic open / close unit 14 to the suction port 3e close.

Then the control device 13 controls the vacuum pump 5 on and opens the electromagnetic on / off valve 9. The test liquid 17th does not get out of the liquid tank 7th into the motor chamber 3c fed and the pressure in the motor chamber 3c is by the vacuum pump 5 reduced. Components of the test liquid thus volatilize 17th not because of the vacuum pump 5 . Also, the predetermined degree of vacuum is achieved within a shorter and more stable period of time than in a case according to the conventional inspection method because of a pressure of the test liquid 17th is not decreased.

The controller 13 determines based on a signal from the pressure sensor 25th whether the specified degree of vacuum (or degree of negative pressure) in the motor chamber 3c is reached or not, and closes the electromagnetic on / off valve 9 and inactivates the vacuum pump 5 when the predetermined degree of vacuum is reached in the motor chamber 3c . Thus, the predetermined degree of vacuum in the motor chamber becomes 3c maintain.

Then the control device 13 opens the electromagnetic on / off valve 16. This causes the test liquid 17th due to the dead weight of the test liquid 17th from the liquid tank 7th into the motor chamber 3c is fed. The stator 1 begins in the test liquid 17th to be immersed. Because the fluid supply channel 8th on the one on the motor housing 3a provided cover body 3b is provided, the test liquid 17th in the liquid tank 7th easily into the engine compartment 3c fed (or supplied).

Then the control device 13 determines on the basis of a signal from the balance 33 whether the stator 1 into the test liquid 17th is immersed (or immersed) or not, and if a sufficient volume of the test liquid 17th for immersing the stator 1 is supplied, the control device 13 closes the electromagnetic on / off valve 16. This stops (or ends) the supply of the test liquid 17th into the motor chamber 3c .

The control device 13 activates the motor 35a of the agitator 35 so that the motor 35a controls the stirrer 35c together with the shaft section 35b in the test liquid 17th turns. In this way, the test liquid becomes 17th in the motor housing 3a touched. This is where the test liquid comes from 17th hardly to a standstill. After a certain time (span), the control device 13 deactivates the motor 35a. Then the control device 13 activates the inspection device 15th so that the inspection facility 15th the electrical leakage (or leakage current) from (or from) the stator 1 through the test liquid 17th inspected (or examined).

When inspecting the stator 1 in the test container 3 is ended, the control device 13 activates the electromagnetic open / close unit 14, so that the electromagnetic open / close unit 14 the suction connection 3e opens. Then the test liquid 17th by the dead weight of the test liquid 17th from the engine chamber 3c fed into the filtration unit 12. The filtration unit 12 eliminates the test liquid 17th Foreign matter in the test liquid during the inspection 17th be mixed in (or entered). The test liquid passing (or passing) through the filtration unit 12 17th is (away) into the liquid tank via the second recovery channel 10b 7th recovered. Thereafter, the control device 13 activates the electromagnetic open / close unit 14, so that the suction connection 3e is closed, and then opens the lid body 3b of the test container 3 .

During the inspection in this inspection system, the motor housing contains 3a In contrast to the conventional inspection system, neither a compression mechanism nor a rotor. Thus, the compression mechanism and the rotor are not wetted (or damp) by the test liquid, so that the compression mechanism and the rotor do not have to be dried in order to complete the product after the inspection.

In this inspection system, the motor housing 3a on which the stator 1 is attached, used as part of the test container. This enables quick assembly of the electric compressor after the inspection.

In this inspection system, the pressure in the motor chamber 3c decreased, and air that is in the test liquid 17th also around the spool 1a is included is eliminated. Therefore, higher inspection accuracy than the conventional inspection system can be achieved.

Therefore, according to the inspection system, an excellent assembling ability of the electric compressor is achieved, the inspection quality (or quality assurance) of the stator 1 very precisely (or with high accuracy) inspected (or carried out) and the product costs are reduced.

Since in this inspection system in particular the one on the cover body 3b provided pressure sensor 25th the pressure in the motor chamber 3c recorded is for the test container 3 no separate pressure sensor required. This allows the inspection to be carried out quickly. Also, there is the motor housing 3a on the scales 33 is arranged, no separate sensor for the motor chamber 3c required to detect a liquid level of the test liquid 17. This also allows the inspection to be carried out quickly. The test liquid is also used in this inspection system 17th from the one in the motor housing 3a trained suction connection 3e discharged. Hence the suction port 3e used effectively.

Second embodiment

In an inspection system of the second embodiment, the stirring mechanism comprises 35 not the motor 35a. A ferromagnetic material, SUS430, is also used for the stirrer 35c used which forms a reluctance motor when power is supplied to the stator 1 is created. The stirrer 35c includes (or has) a variety of Protrusions 40 that of the shaft section 35b towards the stator 1 protrude and are circumferentially arranged along an inner peripheral surface of the stator. Another ferromagnetic material can be used for the stirrer 35c be used.

As in 4th shown are the connection terminals (or connection terminals) 31u, 31v and 31w with the three from the motor housing 3a protruding electrical connection pins 29 respectively connected. The connection terminals 31u, 31v and 31w are connected to a relay circuit 37e via respective lines. In the relay circuit 37, an input contact 37a connected to the connection terminal 31u can optionally be connected to a first output contact 37d or a second output contact 37e. An input contact 37b connected to the connection terminal 31v is connected to or disconnected from an output contact 37f, and an input contact 37c connected to the connection terminal 31w is connected to or disconnected from an output contact 37g. Alternatively, either the connection terminal 31v or the connection terminal 31w can optionally be connected to the first output contact 37d or the second output contact 37e.

The first output contact 37d is with the inspection device 15th connected. The second output contact 37e, the output contact 37f and the output contact 37g are connected to a stator driver circuit 39 which comprises an inverter. Other configurations are similar to the first embodiment.

In this inspection system is (or will) after the immersion of the stator 1 into the test liquid 17th in the engine compartment 3c , the input contact 37a is connected to the second output contact 37e, the input contact 37b is connected to the output contact 37f, and the input contact 37c is connected to the output contact 37g through the relay circuit 37. Then the Stator driver circuit 39 supplies three-phase current to the stator 1 on. This creates a reluctance torque between that within the stator 1 arranged stirrer 35c and the stator 1 so that the stirrer 35c in the test liquid 17th synchronous with one of the stator 1 rotating magnetic field generated. In this way, the test liquid becomes 17th in the motor housing 3a touched.

In this case, a separate drive source such as the motor 35a or the like is not for stirring the test liquid 17th required, which reduces the inspection effort. The plurality of projections serving as salient poles of the reluctance motor 40 protrudes from the shaft section 35b towards the stator 1 and is circumferentially arranged along the inner peripheral surface of the stator. This configuration is for stirring the test liquid 17th suitable.

After a predetermined period of time, the input contact 37a is connected to the first output contact 37d, the input contact 37b is disconnected from the output contact 37f, and the input contact 37c is disconnected from the output contact 37g by the relay circuit 37c. This stops the stirrer 35c (to turn). Then the control device 13 activates the inspection device 15th so that the inspection facility 15th the electrical leakage (or leakage current) from (or from) the stator 1 through the test liquid 17th (through) examined (or inspected, checked).

In this inspection system, a separate drive source such as the motor 35a of the first embodiment or the like is not required to supply the test liquid 17th to stir, which reduces the inspection cost. Also, in this inspection system, the stirrer 35c Stainless steel is used, which makes the stirrer unlikely to corrode 35c occurs. Other operational effects are similar to those of the first embodiment.

The first embodiment and the second embodiment according to the present invention have been described above, but the scope of the present invention is not limited to the above-described embodiments and is intended to include any modifications equivalent in the meaning and scope of the invention.

For example, in the first embodiment and the second embodiment, the (quality) requirement of the stator is met 1 used for the motor section of the electric compressor for a vehicle. However, the inspection system for the stator of the present invention is applicable to stators used for other motors, alternators, or the like in order to inspect the compliance with the requirement (quality) of the stator.

In the first embodiment and the second embodiment, the uniformly pressed passages are formed between the tubes 1d and the corresponding sets of pipes 1i, respectively. However, the uniformly pressed passage can be formed directly in the connector 1c. Alternatively, insertion holes to allow the sets of wires 1i to pass directly through the connector 1c may be used as the evenly crimped passages without providing the tubes 1d.

The inspection facility 15th can meet the (quality) requirement of the stator 1 by detecting an amount of leakage current between the Inspect connection terminal 31 and electrical connector pin 29 (or inspect, inspect). As the pressure changing device, a pressurizing device can be used.

Industrial applicability

The present invention can be applied to a production plant for an engine and the like.

List of reference symbols

1a

Kitchen sink

1

stator

17th

Test liquid

3c

Motor chamber (test chamber, electrical machine chamber)

3

Test container

15th

Inspection facility

8th

Fluid supply channel

7th

Liquid tank

3d

opening

3a

Motor housing (electrical machine housing)

3b

Cover body

35

Agitator

19th

Pressure reduction channel (pressure change channel)

5

Vacuum pump (pressure change device)

25th

Pressure sensor

33

Libra

3e

Suction connection ((fluid) connection connection)

35b

Shaft section

35c

Stirrer

40

head Start

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• JP 201273207 [0005]
• JP 200953145 [0005]

Claims (5)

An inspection system for a stator with a coil having an insulation-coated lead wire, the inspection system having: a test container with a test chamber into which the stator can be inserted in a sealed state and can be immersed in a test liquid which is electrically conductive; an inspection device which is configured to inspect a leakage current from the stator through the test liquid; and a liquid tank which is in communication with the test chamber via a liquid supply channel and holds the test liquid, characterized in that the test container has a cylindrical shape with a bottom and has an opening, and an electric machine chamber to which the stator is internally attached, an electric machine housing , in which the electric machine chamber serves as the test chamber, and has a lid body which is provided on the electric machine housing and is adapted to close the opening for sealing the test chamber, and the lid body has a stirring mechanism which is adapted to stir the test liquid , and the liquid supply channel. Inspection system for the stator Claim 1 , wherein the inspection system further has a pressure change device which is in communication with the test chamber via a pressure change channel and is configured to change a pressure in the test chamber, and the cover body has the pressure change channel and a pressure sensor which is configured to measure a pressure in the test chamber to determine. Inspection system for the stator Claim 1 or 2 , wherein the electrical machine housing is arranged on a scale. Inspection system for the stator according to one of the Claims 1 until 3 , wherein the electric machine housing has a connection port that provides communication between an outside of the electric machine housing and the test chamber, and the connection port is closed when the test liquid is held in the test chamber and is opened when the test liquid is discharged from the test chamber. Inspection system for the stator according to one of the Claims 1 until 4th , wherein the stator has a ring shape, the stirring mechanism has a shaft portion which is rotatably supported by means of the lid body, and a stirrer which is connected to the shaft portion in a rotationally fixed manner and is arranged inside the stator, and the stirrer comprises magnetic material, a plurality of protrusions protruding from the shaft portion toward the stator and circumferentially arranged along an inner peripheral surface of the stator, and rotating as a reluctance motor when power is applied to the stator.

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